WO2022097129A1 - Laminated plastic film for high-speed forming of plastic packages - Google Patents

Laminated plastic film for high-speed forming of plastic packages Download PDF

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Publication number
WO2022097129A1
WO2022097129A1 PCT/IB2022/050069 IB2022050069W WO2022097129A1 WO 2022097129 A1 WO2022097129 A1 WO 2022097129A1 IB 2022050069 W IB2022050069 W IB 2022050069W WO 2022097129 A1 WO2022097129 A1 WO 2022097129A1
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WIPO (PCT)
Prior art keywords
film
microns
pet
bopp
production
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PCT/IB2022/050069
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Spanish (es)
French (fr)
Inventor
Agustin TORRES SEBASTIAN
Original Assignee
Torres Sebastian Agustin
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Publication of WO2022097129A1 publication Critical patent/WO2022097129A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/02—Wrappers or flexible covers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/308—Heat stability
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/31—Heat sealable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B32B2307/518—Oriented bi-axially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/582—Tearability
    • B32B2307/5825—Tear resistant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging

Definitions

  • the present invention refers to the development of new plastic materials, being more specific, a combination of materials is described for the generation of a novel plastic film due to its mechanical properties, which allows the film to be manufactured at higher speeds.
  • the main problem is that the production of packaging filling with films with a BOPP core occurs at a low speed, which is an average of 45 strokes per minute for packaging production, for example, to pack vegetables, which prevents increasing the speed of production in the companies that are dedicated to this purpose, since the materials they use for packaging or bags in these applications do not withstand high temperatures, mainly due to their composition and calibers, this under the understanding of what The parameter that has to be increased if a higher production speed is required is the melting temperature, therefore, companies are forced to maintain low speeds to avoid damage to the packages and thus render them useless, causing low production. in a period of time.
  • the current films used to pack a variety of items, such as processed vegetables for human consumption, are made of polypropylene, which can range from 10 to 100 microns. These films are mostly made with sheets of polypropylene in the center, and with sheets of polypropylene and polyethylene polymers at the ends, that is, the upper surface and the lower surface, this means that they do not have a wide range in the sealing temperature. .
  • the production temperature range used goes from 130°C to 150°C, in such a way that, if the temperature increases or decreases, the seal of the sheets to form the plastic film is no longer achieved.
  • a very common film consists of a BOPP core and has a CPP cover on its upper and lower face, the problem and limitation of these films is that they only support melting temperatures no higher than 140°C, so that a high-speed production process cannot be used, where it is required to increase the melting temperature to achieve the seal in the three layers that would make up the film, since when the temperature increases, it melts or burns, rendering the formed packaging useless or with serious aesthetic and functional deficiencies.
  • These high sealing times for the forming to be aesthetically and functionally suitable in the industry translate into lower production and consequently lower profits.
  • polyethylene films these seal in an approximate range of 80°C to 120°C, so if the temperature is increased, for example, to 260°C in order to increase the production speed, the film melts and is unusable for general use.
  • Another problem is that polyethylene films do not have the rigidity that the market demands, in addition to the fact that most of them are not transparent enough, tending to be milky or opaque in their aesthetic appearance.
  • BOPP Biaxially-oriented Polypropylene pre-coating basement membrane
  • a BOPP pre-coating basement membrane characterized as consisting of three layers, where a surface layer top is PP homopolymer (Propene Polymer); a central layer is homopolymer of
  • a hot melt adhesive comprises the following parts by mass: 80 to 90 parts of EVA, 5 to 10 parts of SIS (styrene-isoprene-styrene), 30 to 50 parts of adhesive resin, 1 to 10 parts of wax, 0.1 to 0.5 parts of antioxidant and 0 to 10 parts of other auxiliaries.
  • One process of preparing the BOPP precoat basement membrane is a biaxially oriented process.
  • the BOPP precoating basement membrane described by the invention can be directly coated with the EVA adhesive without corona treatment on BOPP thin film or first layer, so as to save equipment and production costs.
  • the BOPP precoat basement membrane described by the invention has good adhesion force for paper and is also suitable for special printing paper with thick ink layer, deep color and high moisture content.
  • Document CN201933046 describes a biaxially oriented polypropylene (BOPP) embossed precoating film, used to cover printed package films.
  • the base material of this invention is PP; convex or concave patterns, of which the heights are between 5 microns and 10 microns, are arranged on one side of the base material; the thickness of the base material is between 15 microns and 60 microns; an intermediate layer is evenly coated on an unpatterned surface of the base material; a hot melt adhesive layer is further blended evenly on the surface of the intermediate layer; and the thickness of the base material is between 15 microns and 60 microns, the thickness of the intermediate layer is between 0.01 microns and 0.03 microns, and the combined thickness of the adhesive layer of hot melt is between 15 microns and 40 microns.
  • Embossed and pre-coated BOPP film has the effects that embossed and pre-coated BOPP film can achieve the effect of decorating the attractive appearance of a coated product, it is particularly suitable for applying to pictures, wedding dress albums, photographs and hardcover books and periodicals, and can achieve anti-counterfeiting effect on the coated product due to the peculiarity of the film surface lines; and in addition, decorative processing of the product surface is carried out, so that the protection effect can be achieved, the product is allowed to be waterproof, moisture-proof and light-proof, the film prevents pollution and corrosion chemistry, and shelf life of the product.
  • Document KR20200016148A describes a floor fixing structure made of a plastic material.
  • a central layer comprising: at least one polymeric resin selected from a group consisting of polyvinyl chloride (PVC) resin, polypropylene resin, high density polyethylene resin and polyolefin resin; a filler of wood fiber and/or calcium carbonate; and at least one additive selected from a group consisting of a plasticizer, a foaming agent, a pigment, and an antifungal agent.
  • PVC polyvinyl chloride
  • PVC polypropylene resin
  • high density polyethylene resin and polyolefin resin a filler of wood fiber and/or calcium carbonate
  • additive selected from a group consisting of a plasticizer, a foaming agent, a pigment, and an antifungal agent.
  • a top layer comprising: a decorative layer formed of a material selected from a group consisting of PVC or polyethylene terephthalate (PET) film printed with decorative pattern veneer, pattern paper, and a stone slab and/or a protective layer to protect the decorative layer from abrasion, etc., made of PVC, PET or aluminum oxide (A1_2O_3); and/or a layer of UV coating to finish the top.
  • Document CN103146318A describes a precoat film for paper and plastic lamination.
  • the precoat film is composed of base material, bottom coat and hot melt adhesive layer which are connected in an orderly manner, wherein the base material is biaxially oriented polypropylene (BOPP) film or biaxially oriented polyester film.
  • BOPP biaxially oriented polypropylene
  • biaxially BOPET
  • the bottom coating is polyethyleneimine (PEI)
  • the hot melt adhesive layer is ethylene vinyl acetate (EVA).
  • the film described by the invention can be directly combined with other materials (for example, printing paper, cardboard and plastic film) into a film in the form of heating and pressurizing, and does not generate volatile contaminants.
  • Coated media has a smoother, glossier surface because a layer of thin, clear plastic film is added to the surface. Therefore, the gloss and fastness of the printing material are improved; and the text on the packaging image is more vivid in color and has a third dimension.
  • Document CN105131851A describes a process to achieve a pre-coating, which refers to the process of pre-gluing and rewinding plastic film, combining it with paper prints, where the printed material is coated with a thin, transparent plastic film on the surface, thus improving the gloss and fastness of printed matter, making graphics and text colors more vivid and three-dimensional effect, and at the same time.
  • Pre-coated films are widely used in printed paper, such as packaging boxes, packaging bags, book covers, etc. This technology differs from ours as it uses a paper base on which the film is deposited.
  • plastic and whose purpose is to be used mainly for decorative paper, photographic and for bags that can have an image or design on the paper, where the plastic cover serves as protection.
  • PCT/US1990/006716 discloses a laminated film having a polyethylene terephthalate (PET) core and, on at least one surface thereof, a coating layer of a 1,4-cyclohexanedimethylene terephthalate polyester in which the ratio of the thickness of the polyethylene terephthalate core to the skin layer varies from 1:9 to 9:1, preferably from 1:1 to 4:1.
  • the amount of 1,4-cyclohexanedimethylene groups in the polyester must be present in at least about 70 mol%, the balance being ethylene glycol.
  • At least 50 mol% of the aromatic moieties present in the polyester of the coating layer are due to the presence of terephthalic acid, the acid chlorides or the lower alkyl esters thereof used in the esterification or transesterification, being the isophthalic acid moiety or derivative thereof.
  • One or both sides of the PET base can be coated with the CHDM terephthalate.
  • Document CN103407257B refers to a high-barrier BOPET packaging film, characterized in that: it includes two-layer PET polyester, two layers of PETN polyester, a sandwich layer of MMT-modified PET polyester, where the mound (MMT ) is a natural clay belonging to the group of smectites frequently used as a nanometric filler for polymer nanocomposites, followed successively by PET polyester, PETN polyester, an MMT-modified PET polyester sandwich layer, PETN polyester layer, and a PET polyester layer, where the described PETN polyester layer is melt-extruded from PET and PEN, where the mass amount of PET is 90%, and the mass content of PEN is 10%; the PET described uses a melting point of 200°C, the intrinsic viscosity of the polyester is 0.65dL/g.
  • MMT mound
  • Document CN202847035 describes a shrinkable plastic film made of PET (polyethylene terephthalate) comprising a central layer, two adhesive layers and two layers of PET blow molding film, in which the central layer is made of fiberglass. PET; the two adhesive layers are respectively placed on two surfaces of the core layer, formed by adhesive, and used to connect the core layer with the PET blow molding film layers; the middle layer is surrounded by the PET blow molding film layers and the adhesive layers.
  • PET polyethylene terephthalate
  • PET Composite Plastic Shrink Film not only has better high temperature resistance performance, but also can be recycled, so that PET Composite Plastic Shrink Film is beneficial to environmental protection; simultaneously, due to the PET composite shrink plastic film, the high temperature resistance performance of a material is increased, so that a composite packaging material can not only be directly applied to microwave food, but also can be use directly for baking cakes; the double process is omitted cooking in the traditional cooking process; and food hygiene performance is increased.
  • Figure 1 Structure of the film, made up of a PET core and two BOPP layers.
  • Figure 2. Film with a PET core; top and bottom layer of CPP.
  • Figure 3. Film with PET core, upper layer of BOPP and lower layer of CPP.
  • the objective of this invention is the development of a film for use in packaging, which allows increasing production speeds in a continuous line, preserving at all times the properties of the materials that make it up for use and application in foods, mainly, as are safety, plamity, transparency, and increase the functional properties of the film, avoiding making adjustments or having to constantly vary the production temperatures, from the beginning to the end of it.
  • the main problem that our invention solves is related to the sealing temperature of the BOPP film, which starts at 160°C but as the production speed increases, the film no longer seals due to the loss of temperature in the sealing bars; and on the contrary, if for any reason the production line has to be stopped, this causes the heat sealing bars to increase their temperature because they do not dissipate heat derived from contact with the plastic film, because they are no longer used in a certain moment, therefore the material when coming into contact again with said thermal bar, the film burns by the high temperature reached in the bars, becoming unusable. To restart the production process, film must be wasted to cause the temperature of the bars to remain at a constant regime again without damaging the plastic film.
  • the core proposed in our film supports the temperature variation indicated above in the heat sealing bars, up to 100 °C, achieving the sealing of the external films, without burning them in case that the production line must be stopped to make some adjustment or during production start-up, drastically reducing material waste and increasing the production speed of the forming and filling machines of, for example, vegetables by at least 100% due to their properties. of innocuousness although anything else can be packed.
  • our invention consists of the combination of materials in the form of a film.
  • our film is made up of three layers, where the support core or core is a PET film, whose caliber can range from 7 to 50 microns.
  • the PET core of the new film allows it to withstand temperatures higher than those commonly used for plastic packaging.
  • the PET at the center of our film allows the new combination to withstand temperatures of up to 240°C without melting or burning in less than 0.5 seconds of contact with the sealing bars; subsequently, a top layer is available, and it refers to a BOPP film, with a caliber of 10 to 100 microns, and whose sealing temperature is 140°C; Finally, there is a third layer at the bottom of the PET film, which is a BOPP film with a caliber of 10 to 100 microns, as shown in figure 1. These three layers are spliced generating a sandwich through known processes, thus forming the new film with the capacity for high-speed production, mainly in packaging use.
  • each film that are chosen will depend on the needs of the product to be manufactured, the equipment or the customer's requirements, without this affecting the formation process or the properties of the new film.
  • this composition of films in combination with the caliber of the films, it is possible to obtain a new BOPP-PET-BOPP film.
  • This new film has the property that it does not melt with variations in temperature due to, for example, stoppages in the production line; the film does not stretch with increasing speeds; does not break or tear when increasing production speeds, the seal of the film is achieved even with temperature variations greater than 70°C for 0.5 seconds above its normal sealing temperature, without burning, a situation that would occur without the PET core.
  • the production of packaging with a PET core can be achieved at high speed, thereby increasing the production speed by at least 100%, for example, to pack vegetables.
  • the film is made up of a PET core with a caliber preferably of 12 to 50 microns, on the top layer a CPP film of caliber 20 to 50 microns and melting temperature of 112°C to 126° is placed. C, and in the lower layer there is another CPP film of caliber 20 to 50 microns and melting temperature of 112°C to 126°C.
  • a PET core with a caliber preferably from 7 to 50 microns
  • a BOPP sheet preferably from 10 to 100 microns, which has a melting temperature of 140 ° C
  • This new film allows the different materials it contains to retain their properties in accordance with its technical sheets, which are the following at an exemplary level, but not limiting the use of the materials used in our invention:
  • BOPP and CPP in the outer layers are preferred due to its sealing capacity; likewise, PET as the core of the new film provides high temperature resistance to achieve heat transmission without melting, thus allowing the temperature to pass through to the adjoining layers (upper and lower), achieving the sealing of these In this way, in production we can increase up to 100% the usual speed of production in the formation, for example, of packaging.
  • Another advantage of this new film is that, even with the materials used and its high thermal resistance property, a completely transparent film is obtained, which is highly desirable in the main use of the development or generation of packaging for food products, where requires the user to be able to see the product through its packaging, without the need to open it.
  • our invention has the advantage that, in the manufacturing process, the equipment can work with sealing temperatures in the film that can range from 120°C to a maximum of 250°C, a temperature that is supported by the core. PET. It is worth mentioning that, at this temperature, both the BOPP and the CPP films are completely fused together without burning due to the high temperature and they achieve the required seal.
  • the films can be obtained by simple or combined processes, either fusion and/or pressure and/or adhesion by means of glues or adhesives, and may or may not have a solvent in the latter.
  • Process type In such a way that they can be obtained through conventional processes without the need to modify the production line, in addition, the user can use an infrastructure that is normally used for the use of conventional films, thus avoiding expenses to adapt production lines.

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Abstract

The present invention relates to the development of novel plastic materials. More specifically, it describes a combination of materials for generating a plastic film that is novel for its mechanical properties, allowing the film to be manufactured at higher speeds.

Description

PELÍCULA PLÁSTICA LAMINADA PARA FORMADO DE EMPAQUES DE PLÁSTICO A ALTA VELOCIDAD. LAMINATED PLASTIC FILM FOR HIGH SPEED FORMING OF PLASTIC PACKAGING.
Campo de la invención field of invention
La presente invención se refiere al desarrollo de nuevos materiales de plástico, siendo más específicos, se describe una combinación de materiales para la generación de una película plástica novedosa por sus propiedades mecánicas, que permite la manufactura de la película a mayores velocidades. The present invention refers to the development of new plastic materials, being more specific, a combination of materials is described for the generation of a novel plastic film due to its mechanical properties, which allows the film to be manufactured at higher speeds.
Antecedentes de la invención Background of the invention
En la actualidad existe una gran diversidad de películas plásticas para diferente tipo de aplicaciones, muchas de ellas se enfocan al desarrollo de empaques, pisos y muros laminados, así como de películas para cubiertas con fines estéticos, por lo que su composición resulta distinta a las empleadas por ejemplo para empaques, donde existe la problemática de que no se cuenta con una película que se pueda transformar en llenadoras a altas velocidades ya que las láminas plásticas de las que están conformadas se dañan en el proceso de producción. Currently there is a great diversity of plastic films for different types of applications, many of them focus on the development of packaging, laminated floors and walls, as well as films for covers with aesthetic purposes, so their composition is different from used for example for packaging, where there is the problem that there is no film that can be transformed into high-speed fillers since the plastic sheets they are made of are damaged in the production process.
El problema principal, entre otros, radica en que la producción de llenado de empaques con películas con núcleo de BOPP se da a baja velocidad, la cual es en promedio de 45 golpes por minuto para producción de empaques, por ejemplo, para empacar vegetales, lo que impide aumentar la velocidad de producción en las empresas que se dedican a este fin, ya que los materiales que emplean para los empaques o bolsas en estas aplicaciones no soportan altas temperaturas, debido principalmente a su composición y calibres, esto bajo el entendido de que el parámetro que se tiene que aumentar si se requiere de una mayor velocidad de producción es la temperatura de fusión, por lo tanto las empresas se ven obligadas a mantener baj as velocidades para evitar daños en los empaques y con ello inutilizarlos, provocando una baja producción en un periodo de tiempo. The main problem, among others, is that the production of packaging filling with films with a BOPP core occurs at a low speed, which is an average of 45 strokes per minute for packaging production, for example, to pack vegetables, which prevents increasing the speed of production in the companies that are dedicated to this purpose, since the materials they use for packaging or bags in these applications do not withstand high temperatures, mainly due to their composition and calibers, this under the understanding of what The parameter that has to be increased if a higher production speed is required is the melting temperature, therefore, companies are forced to maintain low speeds to avoid damage to the packages and thus render them useless, causing low production. in a period of time.
Las películas actuales empleadas para empacar diversidad de artículos, como pueden ser vegetales procesados para consumo humano, están hechas de polipropileno, el cual puede ir desde 10 hasta 100 mieras. Dichas películas en su mayoría están hechas con láminas de polipropileno al centro, y con láminas de polímeros de polipropileno y polietileno en los extremos, es decir la superficie superior y la superficie inferior, esto provoca que no tenga un amplio rango en la temperatura de sello. Actualmente, el rango empleado de temperatura de producción va de 130°C a 150°C, de tal forma que, si la temperatura aumenta o disminuye, ya no se logra el sello de las láminas para conformar la película plástica. The current films used to pack a variety of items, such as processed vegetables for human consumption, are made of polypropylene, which can range from 10 to 100 microns. These films are mostly made with sheets of polypropylene in the center, and with sheets of polypropylene and polyethylene polymers at the ends, that is, the upper surface and the lower surface, this means that they do not have a wide range in the sealing temperature. . Currently, the production temperature range used goes from 130°C to 150°C, in such a way that, if the temperature increases or decreases, the seal of the sheets to form the plastic film is no longer achieved.
Una película que es muy común consta de un núcleo de BOPP y cuenta con una cubierta de CPP en su cara superior e inferior, el problema y limitante de estas películas es que solo soportan temperaturas de fusión no mayores a los 140°C, por lo que no se pueden emplear un proceso de producción a alta velocidad, donde es requerido aumentar la temperatura de fusión para lograr el sello en las tres capas que conformarían la película, ya que al aumentar la temperatura esta se funde o quema quedando inservible el empaque formado o con serias deficiencias estéticas y de funcionalidad. Estos tiempos altos de sellado para que el formado quede en forma estética y funcional adecuada en la industria se traducen en una menor producción y por consecuencia menores ganancias. En el caso de las películas de polietileno, estas sellan en un rango aproximado de 80°C a 120°C, por lo que, si se aumenta la temperatura, por ejemplo, a 260°C para poder aumentar la velocidad de producción, la película se funde quedando inutilizada para su uso en general. Otro problema que presenta es que las películas de polietileno no tienen la rigidez que demanda el mercado, además de que en su mayoría no son lo suficientemente transparentes, tendiendo a ser lechosas u opacas en su apariencia estética. A very common film consists of a BOPP core and has a CPP cover on its upper and lower face, the problem and limitation of these films is that they only support melting temperatures no higher than 140°C, so that a high-speed production process cannot be used, where it is required to increase the melting temperature to achieve the seal in the three layers that would make up the film, since when the temperature increases, it melts or burns, rendering the formed packaging useless or with serious aesthetic and functional deficiencies. These high sealing times for the forming to be aesthetically and functionally suitable in the industry translate into lower production and consequently lower profits. In the case of polyethylene films, these seal in an approximate range of 80°C to 120°C, so if the temperature is increased, for example, to 260°C in order to increase the production speed, the film melts and is unusable for general use. Another problem is that polyethylene films do not have the rigidity that the market demands, in addition to the fact that most of them are not transparent enough, tending to be milky or opaque in their aesthetic appearance.
Existe otro polímero que puede cumplir con las características de rigidez, sellado y transparencia, se trata del PVC, sin embargo este material esta siendo rechazado ampliamente por la industria alimenticia debido a que su estructura molecular contiene cloro, un cancerígeno que podría pasar a los alimentos si no es debidamente controlado y usado en el proceso de formación del empaque, además de que en su formulación existe la posibilidad de la existencia de DOP (di octil phtalato) que no cumple con las normas de inocuidad, este simple hecho orilla a los productores de alimentos en evitar su uso para evitar que cualquier confusión, contaminación y daños colaterales que los fabricantes de PVC pudiera derivar en su aplicación en el empaque. There is another polymer that can meet the characteristics of rigidity, sealing and transparency, it is PVC, however this material is being widely rejected by the food industry because its molecular structure contains chlorine, a carcinogen that could pass into food if it is not properly controlled and used in the packaging formation process, in addition to the fact that in its formulation there is the possibility of the existence of DOP (di octyl phthalate) that does not meet safety standards, this simple fact borders producers in avoiding its use to avoid any confusion, contamination and collateral damage that PVC manufacturers could derive from its application in packaging.
En el estado del arte se identificaron los siguientes documentos relacionados: The following related documents were identified in the state of the art:
El documento CN102504716B, titulado BOPP (Biaxially-oriented Polypropylene) pre-coating basement membrane, describe una membrana BOPP (polipropileno orientado biaxialmente), en particular a una membrana basal de prerrevestimiento BOPP. Donde la membrana basal de prerrevestimiento BOPP se caracteriza por constar de tres capas, en donde una capa de superficie superior es homopolímero de PP (Polímero de Propeno); una capa central es homopolímero deDocument CN102504716B, entitled BOPP (Biaxially-oriented Polypropylene) pre-coating basement membrane, describes a BOPP (biaxially oriented polypropylene) membrane, in particular a BOPP pre-coating basement membrane. Where the BOPP precoating basement membrane is characterized as consisting of three layers, where a surface layer top is PP homopolymer (Propene Polymer); a central layer is homopolymer of
PP; una capa superficial inferior es una capa funcional, es decir, una capa adhesiva de fusión en caliente; se adopta la capa adhesiva de fusión en caliente EVA (acetato de etileno y vinilo) modificada; y un adhesivo termofusible comprende los siguientes componentes en parte en masa: 80 a 90 partes de EVA, 5 a 10 partes de SIS (estireno-isopreno-estireno), 30 a 50 partes de resina adhesiva, 1 a 10 partes de cera, 0.1 a 0.5 partes de antioxidante y 0 a 10 partes de otros auxiliares. Un proceso de preparación de la membrana basal de prerrevestimiento BOPP es un proceso orientado biaxialmente. La membrana basal de prerrevestimiento BOPP descrita por la invención se puede revestir directamente con el adhesivo EVA sin tratamiento corona en una película delgada BOPP o una primera capa, de modo que se ahorren equipos y costos de producción. La membrana basal de prerrevestimiento BOPP descrita por la invención tiene una buena fuerza de adhesión para papel y también es adecuada para papel de impresión especial con una capa de tinta gruesa, color profundo y gran contenido de humedad. PP; a lower surface layer is a functional layer, ie a hot melt adhesive layer; modified EVA (ethylene vinyl acetate) hot melt adhesive layer is adopted; and a hot melt adhesive comprises the following parts by mass: 80 to 90 parts of EVA, 5 to 10 parts of SIS (styrene-isoprene-styrene), 30 to 50 parts of adhesive resin, 1 to 10 parts of wax, 0.1 to 0.5 parts of antioxidant and 0 to 10 parts of other auxiliaries. One process of preparing the BOPP precoat basement membrane is a biaxially oriented process. The BOPP precoating basement membrane described by the invention can be directly coated with the EVA adhesive without corona treatment on BOPP thin film or first layer, so as to save equipment and production costs. The BOPP precoat basement membrane described by the invention has good adhesion force for paper and is also suitable for special printing paper with thick ink layer, deep color and high moisture content.
El documento CN201933046 describe una película de prerrevestimiento en relieve de polipropileno orientado biaxial (BOPP), empleado para cobertura de películas de paquetes impresos. El material base de esta invención es el PP; patrones convexos o cóncavos, de los cuales las alturas están entre 5 mieras y 10 mieras, están dispuestos en un lado del material base; el grosor del material base es entre 15 mieras y 60 mieras; una capa intermedia está recubierta uniformemente sobre una superficie sin patrón del material base; una capa adhesiva de fusión en caliente se combina adicionalmente de manera uniforme en la superficie de la capa intermedia; y el grosor del material base está entre 15 mieras y 60 mieras, el grosor de la capa intermedia está entre 0.01 mieras y 0.03 mieras, y el grosor combinado de la capa adhesiva de fusión en caliente está entre 15 mieras y 40 mieras. La película BOPP en relieve y prerecubrimiento tiene los efectos de que la película BOPP en relieve y pre-recubierta puede lograr el efecto de decorar la apariencia atractiva de un producto recubierto, es particularmente adecuada para aplicarse a imágenes, álbumes de vestidos de novia, fotografías y libros de tapa dura y publicaciones periódicas, y puede lograr un efecto de antifalsificación en el producto recubierto debido a la particularidad de las líneas de la superficie de la película; y además, se realiza un procesamiento decorativo de la superficie del producto, de modo que se pueda lograr el efecto de protección, se permita que el producto sea resistente al agua, a la humedad y a la luz, la película evita la contaminación y la corrosión química, y la vida útil del producto. Document CN201933046 describes a biaxially oriented polypropylene (BOPP) embossed precoating film, used to cover printed package films. The base material of this invention is PP; convex or concave patterns, of which the heights are between 5 microns and 10 microns, are arranged on one side of the base material; the thickness of the base material is between 15 microns and 60 microns; an intermediate layer is evenly coated on an unpatterned surface of the base material; a hot melt adhesive layer is further blended evenly on the surface of the intermediate layer; and the thickness of the base material is between 15 microns and 60 microns, the thickness of the intermediate layer is between 0.01 microns and 0.03 microns, and the combined thickness of the adhesive layer of hot melt is between 15 microns and 40 microns. Embossed and pre-coated BOPP film has the effects that embossed and pre-coated BOPP film can achieve the effect of decorating the attractive appearance of a coated product, it is particularly suitable for applying to pictures, wedding dress albums, photographs and hardcover books and periodicals, and can achieve anti-counterfeiting effect on the coated product due to the peculiarity of the film surface lines; and in addition, decorative processing of the product surface is carried out, so that the protection effect can be achieved, the product is allowed to be waterproof, moisture-proof and light-proof, the film prevents pollution and corrosion chemistry, and shelf life of the product.
El documento KR20200016148A, describe una estructura de fijación para piso hecho de un material plástico. Donde de acuerdo a la invención, se dispone de una capa central (núcleo) que comprende: al menos una resina polimérica seleccionada de un grupo que consiste en resina de cloruro de polivinilo (PVC), resina de polipropileno, resina de polietileno de alta densidad y resina de poliolefina; una carga de fibra de madera y/o carbonato de calcio; y al menos un aditivo seleccionado de un grupo que consiste en un plastificante, un agente espumante, un pigmento y un agente antifúngico. Una capa superior que comprende: una capa decorativa formada de un material seleccionado de un grupo que consiste en una película de PVC o tereftalato de pohetileno (PET) impreso con chapa de diseños decorativos, papel de patrón y una losa de piedra y/o una capa protectora para proteger la capa decorativa de la abrasión, etc., hecha de PVC, PET u óxido de aluminio (A1_2O_3); y/o una capa de recubrimiento UV para terminar la parte superior. El documento CN103146318A describe una película de prerrevestimiento para laminación de papel y plástico. La película de prerrevestimiento está compuesta de un material base, un revestimiento inferior y una capa adhesiva de fusión en caliente que están conectados de manera ordenada, en donde el material base es una película de polipropileno orientado biaxialmente (BOPP) o una película de poliéster orientada biaxialmente (BOPET); el revestimiento inferior es polietilenimina (PEI); y la capa adhesiva de fusión en caliente es etileno -acetato de vinilo (EVA). La película descrita por la invención se puede combinar directamente con otros materiales (por ejemplo, papel de impresión, cartón y película de plástico) en una película en forma de calentamiento y presurización, y no genera contaminantes volátiles. El material de impresión recubierto tiene una superficie más lisa y brillante porque se agrega una capa de película de plástico delgada y transparente a la superficie. Por lo tanto, se mejora el brillo y la solidez del material de impresión; y el texto de la imagen del empaque es más vivo en color y tiene una tercera dimensión. Document KR20200016148A describes a floor fixing structure made of a plastic material. Where according to the invention, there is a central layer (core) comprising: at least one polymeric resin selected from a group consisting of polyvinyl chloride (PVC) resin, polypropylene resin, high density polyethylene resin and polyolefin resin; a filler of wood fiber and/or calcium carbonate; and at least one additive selected from a group consisting of a plasticizer, a foaming agent, a pigment, and an antifungal agent. A top layer comprising: a decorative layer formed of a material selected from a group consisting of PVC or polyethylene terephthalate (PET) film printed with decorative pattern veneer, pattern paper, and a stone slab and/or a protective layer to protect the decorative layer from abrasion, etc., made of PVC, PET or aluminum oxide (A1_2O_3); and/or a layer of UV coating to finish the top. Document CN103146318A describes a precoat film for paper and plastic lamination. The precoat film is composed of base material, bottom coat and hot melt adhesive layer which are connected in an orderly manner, wherein the base material is biaxially oriented polypropylene (BOPP) film or biaxially oriented polyester film. biaxially (BOPET); the bottom coating is polyethyleneimine (PEI); and the hot melt adhesive layer is ethylene vinyl acetate (EVA). The film described by the invention can be directly combined with other materials (for example, printing paper, cardboard and plastic film) into a film in the form of heating and pressurizing, and does not generate volatile contaminants. Coated media has a smoother, glossier surface because a layer of thin, clear plastic film is added to the surface. Therefore, the gloss and fastness of the printing material are improved; and the text on the packaging image is more vivid in color and has a third dimension.
El documento CN105131851A, describe un proceso para lograr un pre-recubrimiento, el cual se refiere al proceso de pre-pegado y rebobinado de película plástica combinándola con impresiones en papel, donde el material impreso está recubierto con una película de plástico delgada y transparente en la superficie, mejorando así el brillo y la solidez de la materia impresa, haciendo que los gráficos y los colores del texto sean más vivos y con efecto tridimensional, y al mismo tiempo. Impermeables, antuncrustantes, resistencia a la abrasión, resistencia al plegado, resistencia química, etc. Las películas pre-recubiertas se usan ampliamente en papel impreso, como cajas de embalaje, bolsas de embalaje, cubiertas de libros, etc. Esta tecnología difiere de la nuestra y a que se hace uso de una base de papel sobre la cual se deposita la película plástica, y cuya finalidad es ser empleado para papel decorativo principalmente, fotográfico y para bolsas que pueden tener una imagen o diseño sobre el papel, donde la cubierta plástica sirve de protección. Document CN105131851A describes a process to achieve a pre-coating, which refers to the process of pre-gluing and rewinding plastic film, combining it with paper prints, where the printed material is coated with a thin, transparent plastic film on the surface, thus improving the gloss and fastness of printed matter, making graphics and text colors more vivid and three-dimensional effect, and at the same time. Waterproof, antifouling, abrasion resistance, folding resistance, chemical resistance, etc. Pre-coated films are widely used in printed paper, such as packaging boxes, packaging bags, book covers, etc. This technology differs from ours as it uses a paper base on which the film is deposited. plastic, and whose purpose is to be used mainly for decorative paper, photographic and for bags that can have an image or design on the paper, where the plastic cover serves as protection.
EL documento PCT/US1990/006716 presenta una película laminada que tiene un núcleo de tereftalato de polietileno (PET) y, en al menos una superficie del mismo, una capa de revestimiento de un poliéster de tereftalato de 1,4-ciclohexanodimetileno en el que la relación del grosor del núcleo de tereftalato de polietileno a la capa de revestimiento varía de 1 : 9 a 9: 1, preferiblemente de 1 : 1 a 4: 1. La cantidad de grupos 1,4-ciclohexanodimetileno en el poliéster debe estar presente en al menos aproximadamente 70% en moles, siendo el resto etilenglicol. Al menos el 50% en moles de los restos aromáticos presentes en el poliéster de la capa de recubrimiento se debe a la presencia de ácido tereftálico, los cloruros de ácido o los ésteres de alquilo inferior del mismo utilizados en la esterificación o transestenficación, siendo el resto ácido isoftálico o derivado del mismo. Se puede recubrir uno o ambos lados de la base de PET con el tereftalato de CHDM. Preferiblemente, el espesor total del laminado debe ser inferior a 0,006 pulgadas. Los laminados preparados de acuerdo con esta invención son extremadamente útiles porque se cortan y perforan fácilmente mediante las técnicas usualmente empleadas en la preparación de la base de película para aplicaciones de grabación fotográfica y magnética. PCT/US1990/006716 discloses a laminated film having a polyethylene terephthalate (PET) core and, on at least one surface thereof, a coating layer of a 1,4-cyclohexanedimethylene terephthalate polyester in which the ratio of the thickness of the polyethylene terephthalate core to the skin layer varies from 1:9 to 9:1, preferably from 1:1 to 4:1. The amount of 1,4-cyclohexanedimethylene groups in the polyester must be present in at least about 70 mol%, the balance being ethylene glycol. At least 50 mol% of the aromatic moieties present in the polyester of the coating layer are due to the presence of terephthalic acid, the acid chlorides or the lower alkyl esters thereof used in the esterification or transesterification, being the isophthalic acid moiety or derivative thereof. One or both sides of the PET base can be coated with the CHDM terephthalate. Preferably, the total thickness of the laminate should be less than 0.006 inches. Laminates prepared in accordance with this invention are extremely useful because they are easily cut and perforated by techniques commonly employed in preparing base film for photographic and magnetic recording applications.
El documento CN103407257B, se refiere a una película de empaque BOPET de alta barrera, que se caracteriza porque: incluye poliéster PET de dos capas, dos capas de poliéster PETN, una capa de sándwich de poliéster PET modificado con MMT, donde la montonllomta (MMT) es una arcilla natural perteneciente al grupo de las esmectitas frecuentemente usada como un relleno nanométrico para nancompositos de polímero, seguido sucesivamente de poliéster PET, poliéster PETN, una capa sándwich de poliéster PET modificado con MMT, capa de poliéster PETN y una capa de poliéster PET, donde la capa de poliéster PETN descrita se extruye mediante fusión combinada de PET y PEN, donde la cantidad en masa del PET es del 90%, y el contenido de masa de PEN es 10%; el PET descrito utiliza el punto de fusión 200°C, la viscosidad intrínseca del poliéster es de 0.65dL/g. Document CN103407257B refers to a high-barrier BOPET packaging film, characterized in that: it includes two-layer PET polyester, two layers of PETN polyester, a sandwich layer of MMT-modified PET polyester, where the mound (MMT ) is a natural clay belonging to the group of smectites frequently used as a nanometric filler for polymer nanocomposites, followed successively by PET polyester, PETN polyester, an MMT-modified PET polyester sandwich layer, PETN polyester layer, and a PET polyester layer, where the described PETN polyester layer is melt-extruded from PET and PEN, where the mass amount of PET is 90%, and the mass content of PEN is 10%; the PET described uses a melting point of 200°C, the intrinsic viscosity of the polyester is 0.65dL/g.
El documento CN202847035, describe una película de plástico retráctil compuesta de PET (tereftalato de polietileno) que comprende una capa central, dos capas adhesivas y dos capas de película de moldeo por soplado de PET, en la que la capa central está compuesta de fibra de PET; las dos capas adhesivas se colocan respectivamente en dos superficies de la capa central, formadas por adhesivo, y se usan para conectar la capa central con las capas de película de moldeo por soplado de PET; la capa central está rodeada por las capas de película de moldeo por soplado de PET y las capas adhesivas. Document CN202847035 describes a shrinkable plastic film made of PET (polyethylene terephthalate) comprising a central layer, two adhesive layers and two layers of PET blow molding film, in which the central layer is made of fiberglass. PET; the two adhesive layers are respectively placed on two surfaces of the core layer, formed by adhesive, and used to connect the core layer with the PET blow molding film layers; the middle layer is surrounded by the PET blow molding film layers and the adhesive layers.
La película retráctil de plástico compuesta de PET no solo tiene un mejor rendimiento de resistencia a altas temperaturas, sino que también puede reciclarse, de modo que la película retráctil de plástico compuesto de PET es beneficiosa para la protección del medio ambiente; simultáneamente, debido a la película plástica retráctil compuesta de PET, se incrementa el rendimiento de resistencia a altas temperaturas de un material, de modo que un material de embalaje compuesto no solo se puede aplicar directamente a los alimentos de microondas, sino que también se puede usar directamente para hornear pasteles; se omite el proceso de doble cocción en el proceso de cocción tradicional; y el rendimiento de higiene de los alimentos aumenta. PET Composite Plastic Shrink Film not only has better high temperature resistance performance, but also can be recycled, so that PET Composite Plastic Shrink Film is beneficial to environmental protection; simultaneously, due to the PET composite shrink plastic film, the high temperature resistance performance of a material is increased, so that a composite packaging material can not only be directly applied to microwave food, but also can be use directly for baking cakes; the double process is omitted cooking in the traditional cooking process; and food hygiene performance is increased.
Descripción de las figuras Description of the figures
Figura 1.- Estructura de la película, conformada por un núcleo de PET y dos capas de BOPP.Figure 1.- Structure of the film, made up of a PET core and two BOPP layers.
Figura 2.- Película con núcleo de PET; capa superior e inferior de CPP. Figure 2.- Film with a PET core; top and bottom layer of CPP.
Figura 3.- Película con núcleo de PET, capa superior de BOPP y capa inferior de CPP. Figure 3.- Film with PET core, upper layer of BOPP and lower layer of CPP.
Descripción detallada de la invención Detailed description of the invention
El objetivo de esta invención es el desarrollo de una película para uso en empaques, que permite incrementar las velocidades de producción en línea continua, conservando en todo momento las propiedades de los materiales que la conforman para su uso y aplicación en alimentos, principalmente, como son, inocuidad, plamdad, transparencia, y aumentar las propiedades funcionales de la película, evitando hacer ajustes o tener que ir variando constantemente las temperaturas de producción, desde el inicio hasta el final de la misma. The objective of this invention is the development of a film for use in packaging, which allows increasing production speeds in a continuous line, preserving at all times the properties of the materials that make it up for use and application in foods, mainly, as are safety, plamity, transparency, and increase the functional properties of the film, avoiding making adjustments or having to constantly vary the production temperatures, from the beginning to the end of it.
El problema principal que resuelve nuestra invención se relaciona con la temperatura de sellado de película de BOPP, la cual empieza a 160°C pero al aumentar la velocidad de producción ya no sella la película debido a la perdida de temperatura en las barras de sellado; y por el contrario, si por cualquier motivo se tiene que detener la línea de producción, esto genera que las barras de sellado térmico aumenten su temperatura debido a que no disipan calor derivado del contacto con la película plástica, porque se dejan de usar en un momento determinado, por lo tanto el material al entrar en contacto nuevamente con dicha barra térmica, la película se quema por la alta temperatura alcanzada en las barras, quedando inservible. Par arrancar nuevamente el proceso de producción se debe desperdiciar película para provocar que la temperatura de las barras quede nuevamente a régimen constante sin dañar la película plástica. The main problem that our invention solves is related to the sealing temperature of the BOPP film, which starts at 160°C but as the production speed increases, the film no longer seals due to the loss of temperature in the sealing bars; and on the contrary, if for any reason the production line has to be stopped, this causes the heat sealing bars to increase their temperature because they do not dissipate heat derived from contact with the plastic film, because they are no longer used in a certain moment, therefore the material when coming into contact again with said thermal bar, the film burns by the high temperature reached in the bars, becoming unusable. To restart the production process, film must be wasted to cause the temperature of the bars to remain at a constant regime again without damaging the plastic film.
Otro de los problemas que resuelve nuestra invención es que el núcleo propuesto en nuestra película soporta la variación de temperatura indicada anteriormente en las barra de sellado térmico, hasta en 100 °C, logrando el sellado de las películas externas, sin que se quemen en caso de que la línea de producción se deba detener para hacer algún ajuste o durante el arranque de producción reduciendo drásticamente el desperdicio de materiales y elevando en al menos un 100% la velocidad de producción de las maquinas formadoras y llenadoras de por ejemplo vegetales por sus propiedades de inocuidad aunque se puede empacar cualquier otra cosa. Another of the problems that our invention solves is that the core proposed in our film supports the temperature variation indicated above in the heat sealing bars, up to 100 °C, achieving the sealing of the external films, without burning them in case that the production line must be stopped to make some adjustment or during production start-up, drastically reducing material waste and increasing the production speed of the forming and filling machines of, for example, vegetables by at least 100% due to their properties. of innocuousness although anything else can be packed.
Para lograr dichos objetivos, nuestra invención consiste en la combinación de materiales en forma de película. En una modalidad nuestra película se conforma de tres capas, donde el núcleo o alma de soporte, es una película de PET, cuyo calibre puede ir de 7 a 50 mieras, el alma de PET de la nueva película permite soportar temperaturas mayores que las comúnmente utilizadas para empaques plásticos. To achieve these objectives, our invention consists of the combination of materials in the form of a film. In one mode, our film is made up of three layers, where the support core or core is a PET film, whose caliber can range from 7 to 50 microns. The PET core of the new film allows it to withstand temperatures higher than those commonly used for plastic packaging.
El PET al centro de nuestra película permite que la nueva combinación pueda soportar temperaturas de hasta 240°C sin llegar a fundirse o quemarse en un lapso menor de 0.5 segundos de contacto de las barras selladoras; posteriormente se dispone de una capa superior, y se refiere a una película de BOPP, con un calibre de 10 a 100 mieras, y cuya temperatura de sellado es de 140°C; finalmente se dispone de una tercera capa en la parte inferior de la película de PET, que es una película de BOPP con calibre de 10 a 100 mieras, como se observa en la figura 1, Estas tres capas son empalmadas generando un sándwich mediante procesos conocidos, conformando de este modo la nueva película con capacidad de realizar producción a alta velocidad principalmente en uso de empaques. Los calibres de cada película que se eligen van a depender de las necesidades del producto a fabricar, de los equipos o de los requerimientos del cliente, sin que esto afecte en el proceso de formación ni las propiedades de la nueva película. Con esta composición de películas, en combinación con el calibre de las películas, se logra obtener una nueva película de BOPP-PET-BOPP. The PET at the center of our film allows the new combination to withstand temperatures of up to 240°C without melting or burning in less than 0.5 seconds of contact with the sealing bars; subsequently, a top layer is available, and it refers to a BOPP film, with a caliber of 10 to 100 microns, and whose sealing temperature is 140°C; Finally, there is a third layer at the bottom of the PET film, which is a BOPP film with a caliber of 10 to 100 microns, as shown in figure 1. These three layers are spliced generating a sandwich through known processes, thus forming the new film with the capacity for high-speed production, mainly in packaging use. The calibers of each film that are chosen will depend on the needs of the product to be manufactured, the equipment or the customer's requirements, without this affecting the formation process or the properties of the new film. With this composition of films, in combination with the caliber of the films, it is possible to obtain a new BOPP-PET-BOPP film.
Esta nueva película tiene la propiedad de que no se funde con variaciones de temperatura debido a, por ejemplo, paros en la línea de producción; la película no se estira con incrementos de velocidades; no se rompe o rasga al incrementar velocidades de producción, se logra el sello de la película aun teniendo variaciones de temperatura mayores a 70°C durante 0.5 segundos por arriba de su temperatura normal de sellado, sin llegar a quemarse, situación que sucedería sin el núcleo de PET. This new film has the property that it does not melt with variations in temperature due to, for example, stoppages in the production line; the film does not stretch with increasing speeds; does not break or tear when increasing production speeds, the seal of the film is achieved even with temperature variations greater than 70°C for 0.5 seconds above its normal sealing temperature, without burning, a situation that would occur without the PET core.
De esta forma se puede lograr la producción de empaques con núcleo de PET a alta velocidad, logrando con ello incrementar la velocidad de producción en al menos 100%, por ejemplo, para empacar vegetales. In this way, the production of packaging with a PET core can be achieved at high speed, thereby increasing the production speed by at least 100%, for example, to pack vegetables.
Con esta nueva configuración se obtienen beneficios en las propiedades de la película al momento de llevarla a producción, así como en el uso de la película, por ejemplo, en empaques para diversos artículos, como pueden ser vegetales procesados frescos o congelados o cocinados, productos de panificación, juguetes, dulces, confitería, botanas, etc. En otra modalidad, la película se conforma de un núcleo de PET con un calibre preferentemente de 12 a 50 mieras, en la capa superior se coloca una película de CPP de calibre 20 a 50 mieras y temperatura de fusión de 112°C a 126°C, y en la capa inferior se cuenta con otra película de CPP de calibre 20 a 50 mieras y temperatura de fusión de 112°C a 126°C. With this new configuration, benefits are obtained in the properties of the film when it is taken to production, as well as in the use of the film, for example, in packaging for various items, such as fresh or frozen or cooked processed vegetables, bakery, toys, sweets, confectionery, snacks, etc. In another embodiment, the film is made up of a PET core with a caliber preferably of 12 to 50 microns, on the top layer a CPP film of caliber 20 to 50 microns and melting temperature of 112°C to 126° is placed. C, and in the lower layer there is another CPP film of caliber 20 to 50 microns and melting temperature of 112°C to 126°C.
En otra modalidad, se cuenta con un núcleo de PET con un calibre preferentemente de 7 a 50 mieras, en la capa superior se dispone de una lámina de BOPP preferentemente de 10 a 100 mieras, la cual presenta una temperatura de fusión de 140°C, y en la parte inferior se dispone de una película de CPP de calibre 20 a 50 mieras y temperatura de fusión de 112°C a 1 6°C. In another modality, there is a PET core with a caliber preferably from 7 to 50 microns, in the upper layer there is a BOPP sheet preferably from 10 to 100 microns, which has a melting temperature of 140 ° C , and in the lower part there is a CPP film of caliber 20 to 50 microns and melting temperature of 112°C to 1 6°C.
Esta nueva película permite que los diferentes materiales que contiene conserven sus propiedades de acuerdo con sus hojas técnicas, las cuales son las siguientes a nivel ejemplifi cativo, mas no limitativo en el uso de los materiales empleados en nuestra invención: This new film allows the different materials it contains to retain their properties in accordance with its technical sheets, which are the following at an exemplary level, but not limiting the use of the materials used in our invention:
BOPP BOPP
• Espesor de 20 a 50 mieras • Thickness from 20 to 50 microns
• Resistencia a la rotura long astm d 882 = 145 Nw/mm2 transv 270 • Breaking strength long astm d 882 = 145 Nw/mm2 transv 270
• Elongación a la rotura L astm d882 160 T=50 • Elongation at break L astm d882 160 T=50
• Temp, inicio de sello lado int 112 aC de20 a 30 mieras, 125 p lado exterior, 116 lado int. para cal de 35 a 50 mieras y 130 1 exterior • Temp, start of seal inside side 112 to C from 20 to 30 microns, 125 p outside side, 116 inside side. for lime from 35 to 50 microns and 130 1 exterior
Tensión sup. lado ext >38 CPP top voltage external side >38 CPP
• Espesor de 20 a 60 mieras • Thickness from 20 to 60 microns
• Resistencia a la rotura 3.5 N para calibre de 20 a 30 mieras y 4.5 N para calibres de 35 a 60 mieras • Breaking strength 3.5 N for calibers from 20 to 30 microns and 4.5 N for calibers from 35 to 60 microns
• Temp inicio de sello, 130 aC • Seal start temp, 130 a C
• Tensión sup lado ext 37 dinas/cm • Tension upper outer side 37 dynes/cm
PET PET
• Espesor de 20 a 60 mieras • Thickness from 20 to 60 microns
• Resistencia a la rotura 3.5 N para calibre de 20 a 30 mieras y 4.5 N para calibres de 35 a 60 mieras • Breaking strength 3.5 N for calibers from 20 to 30 microns and 4.5 N for calibers from 35 to 60 microns
• Temp inicio de sello, 130 aC • Seal start temp, 130 a C
• Tensión sup lado ext 37 dinas/cm • Tension upper outer side 37 dynes/cm
En las diferentes modalidades, se prefiere el uso del BOPP y del CPP en las capas externas debido a su capacidad sellante; así mismo, el PET como núcleo de la nueva película proporciona alta resistencia la temperatura para lograr la transmisión de calor sin que se funda, permitiendo de este modo que la temperatura traspase hacia las capas contiguas (superior e inferior), logrando el sellado de estas, de esta manera es que en producción podemos incrementar hasta un 100% la velocidad habitual de producción en el formado, por ejemplo, de empaques. Otra ventaja de esta nueva película es que, aun con los materiales empleados y a su propiedad de alta resistencia térmica, se obtiene una película completamente transparente, lo cual es muy deseable en el uso principal del desarrollo o generación de empaques para productos comestibles, donde se requiere que el usuario pueda ver el producto a través de su empaque, sin la necesidad de abrir el mismo. In the different modalities, the use of BOPP and CPP in the outer layers is preferred due to its sealing capacity; likewise, PET as the core of the new film provides high temperature resistance to achieve heat transmission without melting, thus allowing the temperature to pass through to the adjoining layers (upper and lower), achieving the sealing of these In this way, in production we can increase up to 100% the usual speed of production in the formation, for example, of packaging. Another advantage of this new film is that, even with the materials used and its high thermal resistance property, a completely transparent film is obtained, which is highly desirable in the main use of the development or generation of packaging for food products, where requires the user to be able to see the product through its packaging, without the need to open it.
En las diferentes modalidades, nuestra invención tiene la ventaja de que, en el proceso de manufactura, los equipos pueden trabajar con temperaturas de sellado en la película que pueden ir de los 120°C a máximo 250°C temperatura que es soportada por el núcleo PET. Cabe mencionar que, a esta temperatura, tanto la película de BOPP como la de CPP quedan completamente fundidas entre si sin llegar a quemarse por la alta temperatura y logran el sello requerido. In the different modalities, our invention has the advantage that, in the manufacturing process, the equipment can work with sealing temperatures in the film that can range from 120°C to a maximum of 250°C, a temperature that is supported by the core. PET. It is worth mentioning that, at this temperature, both the BOPP and the CPP films are completely fused together without burning due to the high temperature and they achieve the required seal.
Es importante mencionar que, en cualquiera de sus modalidades o combinaciones, las películas se pueden obtener mediante procesos simples o combinados, ya sea de fusión y/o presión y/o adhesión mediante pegamentos o adhesivos, pudiendo tener o no un solvente en este último tipo de proceso. De tal forma que se logran obtener mediante procesos convencionales sin necesidad de modificar la línea de producción, además el usuario puede emplea una infraestructura que normalmente emplea para el uso de películas convencionales, evitando de este modo gastos para adaptar líneas de producción. It is important to mention that, in any of its modalities or combinations, the films can be obtained by simple or combined processes, either fusion and/or pressure and/or adhesion by means of glues or adhesives, and may or may not have a solvent in the latter. Process type. In such a way that they can be obtained through conventional processes without the need to modify the production line, in addition, the user can use an infrastructure that is normally used for the use of conventional films, thus avoiding expenses to adapt production lines.

Claims

REIVINDICACIONES
1. Una película plástica laminada para formado de empaques de plásticos a alta velocidad, caracterizada porque se conforma de tres capas, donde el núcleo o alma de soporte, es una película de PET, el cual permite soportar temperaturas mayores que las comúnmente utilizadas para empaques plásticos, hasta 240°C evitando que los empaques producidos a alta velocidad se quemen; dispone de una capa superior que se refiere a una película de BOPP, cuya temperatura de sellado es de 140°C; finalmente se dispone de una tercera capa en la parte inferior de la película de PET, que es una película de BOPP de igual temperatura de sellado de 140°C; estas tres capas son empalmadas generando un sándwich mediante procesos conocidos, conformando de este modo la nueva película con capacidad de realizar producción a alta velocidad, principalmente en uso de empaques, soportando temperaturas de hasta 240°C en conjunto logrando el sellado y evitando que se quemen las películas que la conforman. 1. A laminated plastic film for forming plastic packaging at high speed, characterized in that it is made up of three layers, where the core or support core is a PET film, which allows it to withstand higher temperatures than those commonly used for packaging. plastics, up to 240°C preventing high-speed produced packaging from burning; It has a top layer that refers to a BOPP film, whose sealing temperature is 140°C; finally, a third layer is available at the bottom of the PET film, which is a BOPP film with the same sealing temperature of 140°C; these three layers are spliced generating a sandwich by means of known processes, thus forming the new film with the capacity to carry out high-speed production, mainly in the use of packaging, withstanding temperatures of up to 240°C together, achieving sealing and preventing it from drying out. burn the films that make it up.
2. La película plástica laminada de la reivindicación 1 , caracterizada porque la película de PET se prefiere de un calibre de 7 a 50 mieras, la película de BOPP se prefiere de un calibre de 10 a 100 mieras y una película de BOPP con calibre de 10 a 100 mieras2. The laminated plastic film of claim 1, characterized in that the PET film is preferred with a caliber of 7 to 50 microns, the BOPP film is preferred with a caliber of 10 to 100 microns and a BOPP film with a caliber of 10 to 100 microns
3. La película plástica laminada de la reivindicación 1, caracterizada porque el PET al centro de la película permite que la nueva combinación pueda soportar temperaturas de hasta 240°C sin llegar a fundirse o quemarse las láminas plásticas en un lapso menor de 0.5 segundos de contacto con las barras térmicas selladoras, logran el sello requerido para el empaque. La película plástica laminada de la reivindicación 1, caracterizada porque dicha combinación de las tres láminas plásticas permite incrementar las velocidades de producción en línea continua, conservando en todo momento las propiedades de los materiales que la conforman para su uso y aplicación en alimentos, principalmente, como son, inocuidad, planidad, transparencia, y aumentar las propiedades funcionales de la película, evitando hacer ajustes o tener que ir variando constantemente las temperaturas de producción, desde el inicio hasta el final de la misma. La película plástica laminada de la reivindicación 1, caracterizada porque el núcleo propuesto en nuestra película soporta y absorbe la variación de temperatura en las barras de sellado térmico, hasta en 100 °C, logrando el sellado de las películas externas, sin que se quemen en caso de que la línea de producción se deba detener para hacer algún ajuste o durante el arranque de producción reduciendo drásticamente el desperdicio de materiales y elevando en al menos un 100% la velocidad de producción de las maquinas hormadoras y llenadoras de por ejemplo vegetales por sus propiedades de inocuidad aunque se puede empacar cualquier otra cosa. La película plástica laminada de la reivindicación 1 , caracterizada porque los calibres de cada película que se eligen van a depender de las necesidades del producto a fabricar, de los equipos o de los requerimientos del cliente, sin que esto afecte en el proceso de formación m las propiedades de la nueva película; con esta composición de películas, en combinación con el calibre de las películas, se logra obtener una nueva película de BOPP-PET-BOPP. La película plástica laminada de la reivindicación 1, caracterizado porque en una modalidad, la película se conforma de un núcleo de PET con un calibre preferentemente de 12 a 50 mieras, en la capa superior se coloca una película de CPP de calibre 20 a 50 mieras y temperatura de fusión de 112°C a 126°C, y en la capa inferior se cuenta con otra película de CPP de calibre 20 a 50 mieras y temperatura de fusión de 112°C a 126°C. 3. The laminated plastic film of claim 1, characterized in that the PET in the center of the film allows the new combination to withstand temperatures of up to 240 ° C without melting or burning the plastic sheets in a period of less than 0.5 seconds. contact with the thermal sealing bars, achieve the seal required for the package. The laminated plastic film of claim 1, characterized in that said combination of the three plastic sheets allows increasing production speeds in a continuous line, preserving at all times the properties of the materials that make it up for use and application in food, mainly, such as safety, flatness, transparency, and increase the functional properties of the film, avoiding making adjustments or having to constantly vary the production temperatures, from the beginning to the end of it. The laminated plastic film of claim 1, characterized in that the core proposed in our film supports and absorbs the temperature variation in the heat sealing bars, up to 100 ° C, achieving the sealing of the external films, without burning in in the event that the production line must be stopped to make an adjustment or during production start-up, drastically reducing the waste of materials and increasing the production speed of the forming and filling machines of, for example, vegetables by at least 100% for their innocuous properties although anything else can be packed. The laminated plastic film of claim 1, characterized in that the calibers of each film that are chosen will depend on the needs of the product to be manufactured, the equipment or the customer's requirements, without this affecting the formation process m the properties of the new film; With this composition of films, in combination with the caliber of the films, it is possible to obtain a new BOPP-PET-BOPP film. The laminated plastic film of claim 1, characterized in that in one embodiment, the film is made up of a PET core with a gauge preferably from 12 to 50 microns, in the upper layer a CPP film of 20 gauge is placed at 50 microns and melting temperature of 112°C to 126°C, and in the lower layer there is another 20 gauge CPP film at 50 microns and melting temperature from 112°C to 126°C.
8. La película plástica laminada de la reivindicación 1, caracterizada porque en una modalidad, se cuenta con un núcleo de PET con un calibre preferentemente de 7 a 50 mieras, en la capa superior se dispone de una lámina de BOPP preferentemente de 10 a 100 mieras, la cual presenta una temperatura de fusión de 140°C, y en la parte inferior se dispone de una película de CPP de calibre 20 a 50 mieras y temperatura de fusión de 112°C a l26°C. 8. The laminated plastic film of claim 1, characterized in that in one embodiment, there is a PET core with a caliber preferably from 7 to 50 microns, in the upper layer there is a BOPP sheet preferably from 10 to 100 microns, which has a melting temperature of 140°C, and in the lower part there is a CPP film of caliber 20 to 50 microns and a melting temperature of 112°C to 126°C.
9. La película plástica laminada de acuerdo con las reivindicaciones 1, 7 y 8, caracterizada porque en las diferentes modalidades, se prefiere el uso del BOPP y del CPP en las capas externas debido a su capacidad sellante; así mismo, el PET como núcleo de la nueva película proporciona alta resistencia la temperatura para lograr la transmisión de calor sin que se funda, permitiendo de este modo que la temperatura traspase hacia las capas contiguas, es decir superior e inferior, logrando el sellado de estas, de esta manera es que en producción podemos incrementar hasta un 100% la velocidad habitual de producción en el formado, por ejemplo, de empaques. 9. The laminated plastic film according to claims 1, 7 and 8, characterized in that in the different modalities, the use of BOPP and CPP in the outer layers is preferred due to its sealing capacity; Likewise, PET as the core of the new film provides high temperature resistance to achieve heat transmission without melting, thus allowing the temperature to pass through to the adjacent layers, that is, the upper and lower layers, achieving the sealing of these, in this way is that in production we can increase up to 100% the usual speed of production in the formation, for example, of packaging.
10. La película plástica laminada de la reivindicación 1, caracterizada porque tiene la propiedad de que no se funde con variaciones de temperatura debido a, por ejemplo, paros en la línea de producción; la película no se estira con incrementos de velocidades; no se rompe o rasga al incrementar velocidades de producción, se logra el sello de la película aun teniendo variaciones de temperatura mayores a 70°C durante 0.5 segundos 18 por arriba de su temperatura normal de sellado, sin llegar a quemarse, situación que sucedería sin el núcleo de PET. La película plástica laminada de la reivindicación 1 , caracterizada porque se obtiene una película completamente transparente, lo cual es muy deseable en el uso principal del desarrollo o generación de empaques para productos comestibles, donde se requiere que el usuario pueda ver el producto a través de su empaque, sin la necesidad de abrir el mismo. La película plástica laminada de la reivindicación 1, caracterizada porque en cualquiera de sus modalidades o combinaciones, las películas se pueden obtener mediante procesos simples o combinados, ya sea de fusión y /o presión y/o adhesión mediante pegamentos o adhesivos, pudiendo tener o no un solvente en este último tipo de proceso 10. The laminated plastic film of claim 1, characterized in that it has the property that it does not melt with variations in temperature due to, for example, stoppages in the production line; the film does not stretch with increasing speeds; does not break or tear when increasing production speeds, the seal of the film is achieved even with temperature variations greater than 70°C for 0.5 seconds 18 above its normal sealing temperature, without burning, a situation that would happen without the PET core. The laminated plastic film of claim 1, characterized in that a completely transparent film is obtained, which is highly desirable in the main use of the development or generation of packaging for edible products, where the user is required to be able to see the product through its packaging, without the need to open it. The laminated plastic film of claim 1, characterized in that in any of its modalities or combinations, the films can be obtained by simple or combined processes, either fusion and/or pressure and/or adhesion by means of glues or adhesives, and may have or not a solvent in the latter type of process
PCT/IB2022/050069 2020-11-05 2022-01-05 Laminated plastic film for high-speed forming of plastic packages WO2022097129A1 (en)

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