CN113619239A - Composite film and packaging bag and production method thereof - Google Patents

Composite film and packaging bag and production method thereof Download PDF

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Publication number
CN113619239A
CN113619239A CN202110913902.4A CN202110913902A CN113619239A CN 113619239 A CN113619239 A CN 113619239A CN 202110913902 A CN202110913902 A CN 202110913902A CN 113619239 A CN113619239 A CN 113619239A
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China
Prior art keywords
layer
composite
composite film
packaging bag
surface layer
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CN202110913902.4A
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Chinese (zh)
Inventor
张逢辉
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Ld Packaging Co ltd
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Ld Packaging Co ltd
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Priority to CN202110913902.4A priority Critical patent/CN113619239A/en
Publication of CN113619239A publication Critical patent/CN113619239A/en
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    • 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
    • B31B70/20—Cutting sheets or blanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/60—Uniting opposed surfaces or edges; Taping
    • B31B70/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure
    • 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
    • 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
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/12—Bags or like containers made of paper and having structural provision for thickness of contents with two or more compartments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2160/00—Shape of flexible containers
    • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2170/00—Construction of flexible containers
    • B31B2170/20—Construction of flexible containers having multi-layered walls, e.g. laminated or lined
    • 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
    • B32B2250/242—All polymers belonging to those covered by group B32B27/32
    • 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
    • B32B2307/306—Resistant to heat
    • 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
    • B32B2307/734—Dimensional 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
    • B32B2439/00—Containers; Receptacles
    • B32B2439/02—Open containers
    • B32B2439/06—Bags, sacks, sachets
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wrappers (AREA)

Abstract

The invention provides a composite film, which at least comprises a surface layer and a bottom layer which are overlapped from top to bottom; the surface layer comprises PP and/or a PP-containing composite copolymer, and a barrier film is arranged on the outer side of the surface layer; the bottom layer at least comprises ternary polymerization PP; the total thickness of the composite membrane is 100-200 mu m; the invention also provides a production method of the composite film and a packaging bag using the composite film. The main components of the composite film are PP and/or PP-containing composite copolymer, the composite film has good stiffness and mechanical properties, can be used for manufacturing packages with high impact resistance requirements, and is simple in constituent components and convenient to recycle; the production method of the invention can rapidly produce the composite film; the packaging bag disclosed by the invention is low in recycling difficulty, stable in physical and chemical properties and convenient for secondary processing and modification of recycled materials.

Description

Composite film and packaging bag and production method thereof
Technical Field
The invention relates to the field of packaging materials, in particular to a composite film, a packaging bag and a production method thereof.
Background
The existing packaging materials are mostly composite plastic films, and the reason is that the composite plastic films are plastic films made of multiple materials in a compounding mode, have good processing and barrier properties, and can be applied to various scenes of different temperature conditions, transportation conditions and storage conditions. The composite plastic film taking PET \ NY \ PE and PET \ AL \ PE as composite structures is most widely applied, but the components of the two composite plastic films are complex and difficult to degrade and recover, so that the composite plastic film/packaging bag can only be treated by a landfill or incineration method after being used, and the pollution to the environment is large, and therefore a packaging material with reliable performance and low recycling difficulty is urgently needed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a composite membrane, the main component of which is PP polymer, the composite membrane has excellent service performance, simple components and convenient recycling.
In order to achieve the purpose, the invention adopts the following technical scheme:
a composite film comprises at least a surface layer and a bottom layer which are stacked from top to bottom; the surface layer comprises PP and/or a PP-containing composite copolymer, and a barrier film is arranged on the outer side of the surface layer; the bottom layer at least comprises ternary polymerization PP; the total thickness of the composite film is 100-200 μm.
Compared with the prior art, the composite membrane has the following beneficial effects:
(1) the invention adopts a PP composite structure, each layer mainly comprises PP and/or a PP-containing composite copolymer, the composition of each layer is relatively definite, the main component of each layer is still PP and/or PP-containing composite copolymer after recovery, the physical and chemical properties of the PP and/or PP-containing composite copolymer are known to be relatively stable, the PP and/or PP-containing composite copolymer can be processed into similar products after recovery, the reproducibility is strong, the recovery difficulty is low, the recovery cost and the recovery cost are relatively low, and the utilization rate of the material is improved;
(2) the outer layer of the invention comprises PP and/or PP-containing composite copolymer, has the advantages of no odor, no toxicity, chemical resistance, heat resistance, electrical insulation, good dimensional stability, heat shrinkage resistance, high-strength mechanical property, good high-wear-resistance processing property and the like, and is suitable for printing processing; the bottom layer at least contains ternary copolymer PP, and the polypropylene composite material has good low-temperature heat sealability (above 140 ℃), tensile property, stiffness and toughness, and good impact resistance, and can avoid the damage of the package using the polypropylene composite material.
Preferably, the weight ratio of the raw materials of each material layer is as follows:
surface layer: PP-R: 40-60% of PP-B: 30-50%;
bottom layer: ternary polymerization PP: 40-50% of PP elastomer: 20 to 60 percent.
The surface layer adopts the setting mode, so that the good environmental stress crack resistance and temperature resistance of PP-R and the good impact resistance of PP-B are combined, and the elongation of the plastic product is improved; the bottom layer adopts the arrangement mode, so that the material characteristics of the ternary polymerization PP and the PP elastomer are combined, the tensile strength and the heat sealing strength of the material are improved, the material has excellent elasticity and tear resistance, and the dimensional stability of the material under the condition of no temperature or pressure is improved.
Preferably, the surface layer further comprises EVOH, the weight ratio of the EVOH is 5-10%, and the oxygen barrier property of the surface layer can be improved by adding EVOH into the surface layer.
Preferably, the floor mat further comprises an intermediate layer, wherein the intermediate layer is arranged between the surface layer and the bottom layer and is MOPP.
The MOPP is formed by plating an aluminum oxide film on the surface of the BOPP, the MOPP has good gas barrier property, and in the invention, the oxygen permeability of the BOPP is 2000cc/m2And the oxygen permeability of the MOPP after treatment is less than 1cc/m2。
Another object of the present invention is to provide a packaging bag using the above composite film, which includes a bag body made of the above composite film.
Compared with the prior art, the packaging bag has good processing performance, printing performance and service performance, and is made of the composite film with simple components, so that the packaging bag can be used as a substitute of the traditional composite film packaging bag, meets the requirements of packaging different materials, is convenient to recycle and regenerate, and reduces the pollution of the packaging bag to the environment.
Another object of the present invention is to provide a method for producing the above composite film, comprising the steps of:
(a1) respectively adding raw materials required by different layers into different extrusion mechanisms to be extruded and molded to form a plurality of single-layer bodies;
(a2) carrying out barrier film coating treatment on part of the single-layer body;
(a3) a plurality of single-layer bodies are compounded into a whole;
(a4) carrying out inflation treatment on the tube blank to form a film body;
(a5) drafting the film body;
the heating temperature of the extrusion mechanism for extruding the single-layer body of the surface layer is 170-190 ℃; the heating temperature of the extrusion mechanism for extruding the bottom layer single-layer body is 130-155 ℃.
Compared with the prior art, the production method of the composite membrane is mature in applied process and convenient for large-scale popularization and use, so that the production cost of producing the composite membrane with high performance and convenient recycling can be effectively reduced.
Preferably, in the step (a2), a plurality of single-layer bodies are compounded into a whole body by dry compounding or solvent-free compounding, the gluing amount is 1-5 g/square meter, the compounding speed is 100-300 m/min, and the compounding temperature is 50-80 ℃.
Because the surface layer and the bottom layer both contain PP materials and are suitable for various adhesives for adhering the PP materials, the production mode has the advantages of simple operation, low process difficulty (low compounding temperature) and low cost, and is convenient for popularization and use of the composite film.
Another object of the present invention is to provide a method for producing the above packaging bag, comprising the steps of:
(b1) placing a plurality of rolled composite films on a low-tension conveying mechanism of bag making equipment;
(b2) wherein the two composite films are conveyed by the low-tension conveying mechanism to enter the bonding mechanism in an aligned parallel state;
(b3) a plurality of composite films are bonded in a bonding mechanism;
(b4) and the blanking mechanism cuts the bonded packaging bag.
Compared with the prior art, the production method of the packaging bag disclosed by the invention has the advantages that the composite film made of the PP material has the processing characteristics (stable size and good high temperature resistance) suitable for the PP material, and the tension conveying mechanism is used for feeding, so that the front and back traction tension of the composite film are consistent, and the shape stability of the composite film during processing is ensured.
Preferably, in the step (b3), a heating module is arranged in the bonding mechanism, and the heating temperature of the heating module is 150-.
The heating temperature of the extrusion mechanism for extruding the single-layer body of the surface layer is 170-190 ℃; the heating temperature of the extrusion mechanism for extruding the bottom single-layer body is 130-155 ℃, in order to adapt to the processing characteristics of the composite film, the composite film is processed by using a heating mode, wherein the heating temperature of the heating module is set to be close to the surface layer melting temperature of the composite film, so that the corresponding positions of two composite films which are in parallel in contraposition are bonded to form a packaging bag after being heated, the problem that the packaging bag has poor service performance due to the fact that the two composite films are bonded not firmly due to too low heating temperature is avoided, and in addition, when the heating temperature is within the temperature range of melting and heating of the bottom layer, the situation that the material performance is damaged due to long-time heating of the bottom layer and the service performance of the packaging bag is influenced can be avoided.
Preferably, in the step (b3), an ultrasonic module is arranged in the bonding mechanism, and the ultrasonic frequency of the ultrasonic module is 15-20 KHz.
The ultrasonic bonding is to generate mechanical friction force between material molecules of a bonding part through ultrasonic waves to release heat, and the material softening and bonding are realized by using the heat effect, and the material of the part (bottom layer) bonded by the two composite films of the packaging bag is PP-type material, so the packaging bag is suitable for ultrasonic bonding (two materials with different materials and strong nonpolar compounds cannot ensure that the ultrasonic bonding can be used for welding and bonding); in addition, the ultrasonic frequency of the ultrasonic module is set to be 15-20KHz, when the ultrasonic module is used for aligning the mutually bonded parts of the two composite films for ultrasonic treatment, the heat generated at the mutually bonded positions of the two composite films is moderate, and the range of heat radiation is moderate, so that the material hardening can be effectively avoided, the high flexibility and other service performances of the packaging bag can be ensured, and the material is prevented from being heated and deformed due to the excessive diffusion of the heat to the non-bonded parts.
Drawings
FIG. 1 is a schematic diagram of a first embodiment;
FIG. 2 is a schematic view of the second embodiment;
FIG. 3 is a schematic view of a three-sided envelope;
FIG. 4 is a schematic view of a stand-up pouch;
FIG. 5 is a schematic view of the thermal profile of two composite membranes stacked under ultrasonic treatment using a thermographic inspection apparatus.
Description of reference numerals:
1 composite film, 2 surface courses, 3 bottoms, 4 intermediate levels, 5 bag bodies, 6 openings.
Detailed Description
Embodiments of the present invention are described below with reference to the accompanying drawings:
example one
Referring to fig. 1, a composite film 1 of the present embodiment, a composite film 1, includes at least a surface layer 2 and a bottom layer 3 stacked from top to bottom; the surface layer 2 comprises PP and/or a PP-containing composite copolymer, and a barrier film is arranged on the outer side of the surface layer 2; the bottom layer 3 at least comprises ternary copolymer PP; the total thickness of the composite film 1 is 100-200 μm.
The barrier film on the face layer 2 is a PVA or alumina layer.
In this embodiment, the thickness of the surface layer 2 is 10-50 μm, and the thickness of the bottom layer 3 is 50-150 μm.
Preferably, the weight ratio of the raw materials of each material layer is as follows:
surface layer 2: PP-R: 40-60% of PP-B: 30-50%;
bottom layer 3: ternary polymerization PP: 40-50% of PP elastomer: 20 to 60 percent.
The surface layer 2 adopts the arrangement mode, so that the good environmental stress crack resistance and temperature resistance of PP-R and the good impact resistance of PP-B are combined, and the elongation of the plastic product is improved; the bottom layer 3 adopts the arrangement mode, so that the material characteristics of the ternary polymerization PP and the PP elastomer are combined, the tensile strength and the heat sealing strength of the material are improved, the material has excellent elasticity and tear resistance, and the dimensional stability of the material under the condition of no temperature or pressure is improved.
Preferably, the surface layer 2 further comprises EVOH, the weight ratio of the EVOH is 5-10%, and the oxygen barrier performance of the surface layer 2 can be improved by adding EVOH into the surface layer 2.
Table 1: physical Properties of the composite film of the present invention
Item Parameter(s)
Tensile Strength (MPa) 33
Elongation at Break (%) 150
Composite strength (N/mm) ＞0.3
Heat sealing Strength (N/mm) ＞3.5
Water vapor transmission rate (cc/square meter/24H) ＜2.0
Table 2: physical properties of PET \ NY \ PE composite films with same thickness
Item Parameter(s)
Tensile Strength (MPa) 35
Elongation at Break (%) 150
Composite strength (N/mm) 0.3
Heat sealing Strength (N/mm) ＞3.0
Water vapor transmission rate (cc/square meter/24H) ＜20.0
By comparing the above tables, it can be seen that:
(1) the mechanical properties (tensile strength and elongation at break) of the composite film 1 of the invention are close to those of a PET \ NY \ PE composite film with the same thickness, and the composite film 1 of the invention can replace the PET \ NY \ PE composite film as a good packaging film material;
(2) because the multilayer materials forming the composite film 1 are all PP type, the composition material components are close, the structural strength (composite strength and heat sealing strength) after processing is superior to that of a PET \ NY \ PE composite film, and the composite film has good structural stability;
(3) the water-gas permeability of the composite membrane 1 is far better than that of a PET \ NY \ PE composite membrane, so that water, oil, oxygen and the like in the external environment are effectively blocked outside the composite membrane.
Compared with the prior art, the composite film 1 has the following beneficial effects:
(1) the invention adopts a PP composite structure, each layer mainly comprises PP and/or a PP-containing composite copolymer, the composition of each layer is relatively definite, the main component of each layer is still PP and/or PP-containing composite copolymer after recovery, the physical and chemical properties of the PP and/or PP-containing composite copolymer are known to be relatively stable, the PP and/or PP-containing composite copolymer can be processed into similar products after recovery, the reproducibility is strong, the recovery difficulty is low, the recovery cost and the recovery cost are relatively low, and the utilization rate of the material is improved;
(2) the outer layer of the invention comprises PP and/or PP-containing composite copolymer, has the advantages of no odor, no toxicity, chemical resistance, heat resistance, electrical insulation, good dimensional stability, heat shrinkage resistance, high-strength mechanical property, good high-wear-resistance processing property and the like, and is suitable for printing processing, and the barrier film is arranged on the outer side of the surface layer 2, so that the barrier property of the invention to external substances (water, oil and oxygen) can be improved; the bottom layer 3 at least comprises ternary copolymer PP, has good low-temperature heat sealability (above 140 ℃), tensile property, stiffness and toughness and good impact resistance, and can avoid the damage of the package using the invention.
Example two
Referring to fig. 2, this embodiment is a modification of the first embodiment, and is different from the first embodiment in that the composite film 1 is further provided with an intermediate layer 4.
The decorative plate is characterized by further comprising an intermediate layer 4, wherein the intermediate layer 4 is arranged between the surface layer 2 and the bottom layer 3, and the intermediate layer 4 is MOPP.
The MOPP is formed by plating an aluminum oxide film on the surface of the BOPP, the MOPP has good gas barrier property, and in the invention, the oxygen permeability of the BOPP is 2000cc/m2And the oxygen permeability of the MOPP after treatment is less than 1cc/m2。
In this embodiment, the thickness of the surface layer 2 is 20-30 μm, the thickness of the middle layer 4 is 10-30 μm, and the thickness of the bottom layer 3 is 50-150 μm.
Table 3: physical Properties of the composite film of the present invention
Item Parameter(s)
Tensile Strength (MPa) 80
Elongation at Break (%) 180
Composite strength (N/mm) ＞0.3
Heat sealing Strength (N/mm) ＞3.5
Water vapor transmission rate (cc/square meter/24H) ＜1.0
By comparing the above tables, it can be seen that:
the MOPP middle layer 4 can effectively improve the tensile strength, the elongation at break and the water vapor transmission rate of the composite film 1.
EXAMPLE III
Another object of the present invention is to provide a packaging bag using the above composite film 1, which includes a bag body 5, wherein the bag body 5 is made of the above composite film 1.
Referring to fig. 3, the case where the packing bag is a three-sided envelope is shown; referring to fig. 4, which shows the case that the packaging bag is a vertical bag, the bag body 5 is provided with an opening 6, and after the packaging bag contains materials/food, the opening 6 is sealed by a sealing device; the bonded portions of the two composite films 1 are shown in fig. 3 and 4 using hatching.
Compared with the prior art, the packaging bag has good processing performance, printing performance and service performance, and is made of the composite film 1 with simple components, so that the packaging bag can be used as a substitute for the traditional composite film 1 packaging bag, meets the requirements of packaging different materials, is convenient to recycle and regenerate, and reduces the pollution of the packaging bag to the environment.
Example four
Another object of the present invention is to provide a method for producing the above composite film, comprising the steps of:
(a1) respectively adding raw materials required by different layers into different extrusion mechanisms to be extruded and molded to form a plurality of single-layer bodies;
(a2) carrying out barrier film coating treatment on the surface layer single-layer body;
(a3) a plurality of single-layer bodies are compounded into a whole;
(a4) carrying out inflation treatment on the tube blank to form a film body;
(a5) drafting the film body;
the heating temperature of the extrusion mechanism for extruding the single-layer body of the surface layer is 170-190 ℃; the heating temperature of the extrusion mechanism for extruding the bottom layer single-layer body is 130-155 ℃.
Specifically, the barrier film coating treatment of the surface layer single-layer body comprises the following steps: a PVA barrier coating layer is formed on the surface through a coating mode, or an alumina barrier layer is evaporated on the surface through an evaporation mode.
Preferably, in the step (a2), a plurality of single-layer bodies are compounded into a whole body by dry compounding or solvent-free compounding, the gluing amount is 1-5 g/square meter, the compounding speed is 100-300 m/min, and the compounding temperature is 50-80 ℃.
Because the surface layer and the bottom layer both contain PP materials and are suitable for various adhesives for adhering the PP materials, the production mode has the advantages of simple operation, low process difficulty (low compounding temperature) and low cost, and is convenient for popularization and use of the composite film.
Compared with the prior art, the production method of the composite membrane is mature in applied process and convenient for large-scale popularization and use, so that the production cost of producing the composite membrane with high performance and convenient recycling can be effectively reduced.
EXAMPLE five
Another object of the present invention is to provide a method for producing the composite film of example two, which is different from example four in the step (a 2).
(a2) Carrying out barrier film coating treatment on the surface layer single-layer body and the middle layer single-layer body;
specifically, the barrier film coating treatment of the surface layer single-layer body comprises the following steps: forming a PVA barrier coating on the surface in a coating mode, or evaporating an alumina barrier layer on the surface in an evaporation mode; the middle layer single body is processed by the coating treatment of a barrier film, which comprises the following steps: and evaporating an alumina barrier layer on the surface by an evaporation way.
Other steps of this embodiment are the same as those of the fourth embodiment, and will not be described in detail here.
EXAMPLE six
Another object of the present invention is to provide a method for producing the above packaging bag, comprising the steps of:
(b1) placing a plurality of rolled composite films on a low-tension conveying mechanism of bag making equipment;
(b2) wherein the two composite films are conveyed by the low-tension conveying mechanism to enter the bonding mechanism in an aligned parallel state;
(b3) a plurality of composite films are bonded in a bonding mechanism;
(b4) and the blanking mechanism cuts the bonded packaging bag.
Preferably, in the step (b3), a heating module is arranged in the bonding mechanism, and the heating temperature of the heating module is 150-.
Specifically, the optimal heating temperature of the heating module is 165-175 ℃.
The heating temperature of the extrusion mechanism for extruding the single-layer body of the surface layer is 170-190 ℃; the heating temperature of the extrusion mechanism for extruding the bottom single-layer body is 130-155 ℃, in order to adapt to the processing characteristics of the composite film, the composite film is processed by using a heating mode, wherein the heating temperature of the heating module is set to be close to the surface layer melting temperature of the composite film, so that the corresponding positions of two composite films which are in parallel in contraposition are bonded to form a packaging bag after being heated, the problem that the packaging bag has poor service performance due to the fact that the two composite films are bonded not firmly due to too low heating temperature is avoided, and in addition, when the heating temperature is within the temperature range of melting and heating of the bottom layer, the situation that the material performance is damaged due to long-time heating of the bottom layer and the service performance of the packaging bag is influenced can be avoided.
The contact bonding time of the composite film in the bonding mechanism is 0.3-1 second, so that the overheating of the material caused by too long heating time of the composite film is avoided.
Compared with the prior art, the production method of the packaging bag disclosed by the invention has the advantages that the composite film made of the PP material has the processing characteristics (stable size and good high temperature resistance) suitable for the PP material, and the tension conveying mechanism is used for feeding, so that the front and back traction tension of the composite film are consistent, and the shape stability of the composite film during processing is ensured.
EXAMPLE seven
Another object of the present invention is to provide a method for producing the above-mentioned packaging bag, which is different from the sixth embodiment in that: in the step (b3), the composite film is bonded using an ultrasonic module.
And (b3), an ultrasonic module is arranged in the bonding mechanism, and the ultrasonic frequency of the ultrasonic module is 15-20 KHz.
The ultrasonic bonding is to generate mechanical friction force between material molecules of a bonding part through ultrasonic waves to release heat, and the material softening and bonding are realized by using the heat effect, and the material of the part (bottom layer) bonded by the two composite films of the packaging bag is PP-type material, so the packaging bag is suitable for ultrasonic bonding (two materials with different materials and strong nonpolar compounds cannot ensure that the ultrasonic bonding can be used for welding and bonding); in addition, the ultrasonic frequency of the ultrasonic module is set to be 15-20KHz, when the ultrasonic module is used for aligning the mutually bonded parts of the two composite films for ultrasonic treatment, the heat generated at the mutually bonded positions of the two composite films is moderate, and the range of heat radiation is moderate, so that the material hardening can be effectively avoided, the high flexibility and other service performances of the packaging bag can be ensured, and the material is prevented from being heated and deformed due to the excessive diffusion of the heat to the non-bonded parts.
This example provides experimental data for composite membranes under ultrasonic module treatment:
the composite membrane of example one was sonicated using a sonication module at a specified frequency, for a specified sonication range, and for a specified time.
Referring to fig. 5, in the case where the distance of the ultrasonic module from the composite membrane is 1-5mm, the thermal imaging detection apparatus is used to detect the heat distribution of the two composite membranes stacked under ultrasonic treatment.
The optimal heating temperature of the bottom layer is known as 165-175 ℃.
Table 5: experimental data of composite membrane under ultrasonic module treatment
Figure BDA0003204928460000081
Figure BDA0003204928460000091
And (4) conclusion:
(1) according to the serial numbers 1 to 8, when the ultrasonic time is less than 0.5s and the frequency of the ultrasonic is less than 15KHz, the thermal imaging shows that the heating range is less than the ultrasonic heating range, the situation that part of the composite membrane cannot be heated can occur, and the bottom layer of the composite membrane cannot be heated to the temperature capable of bonding the two composite membranes;
(2) according to the serial numbers 21 to 24, the frequency of the ultrasonic wave is 15KHz, and when the time of the ultrasonic wave is 0.9s, the bottom layer of the composite membrane can be heated to the temperature which can bond the two composite membranes;
(3) according to the serial numbers of 25 to 32, when the frequency of the ultrasonic wave is 20KHz and the time of the ultrasonic wave is 0.7 to 0.9s, the bottom layer of the composite film can be heated to the temperature which can bond the two composite films;
(4) according to serial number 32, it can be expected that when the ultrasonic frequency is 20KHz and the ultrasonic time exceeds 0.9s, the range of heat radiation (heat outward diffusion) of the bottom layer of the composite film is greater than the range of ultrasonic radiation, and the part of the peripheral side of the bonding position of the two composite films is easily deformed due to overheating.
The remaining steps and setup parameters of this example are the same as those of the seventh example and will not be described in detail here.
Example eight
In this embodiment, as another arrangement of the sixth embodiment and the seventh embodiment, if the packaging bag is a stand-up bag, the step (b 2): wherein two complex films are carried through low tension conveying mechanism and are got into bonding mechanism with counterpoint parallel state, and another complex film is carried to between two parallel complex films of counterpoint through low tension conveying mechanism, and is located two same lateral parts of complex film.
The position of the placement of several composite films on a bag making apparatus for the production of stand-up bags is known in the art and will not be described in detail here.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims (10)

1. The composite film is characterized by at least comprising a surface layer and a bottom layer which are overlapped from top to bottom;
the surface layer comprises PP and/or a PP-containing composite copolymer, and a barrier film is arranged on the outer side of the surface layer;
the bottom layer at least comprises ternary polymerization PP;
the total thickness of the composite film is 100-200 μm.
2. The composite film according to claim 1, wherein the weight ratio of the raw materials of each material layer is as follows:
surface layer: PP-R: 40-60% of PP-B: 30-50%;
bottom layer: ternary polymerization PP: 40-50% of PP elastomer: 20 to 60 percent.
3. A composite membrane according to any one of claims 1 to 2,
the surface layer also comprises EVOH, and the weight proportion of EVOH is 5-10%.
4. The composite film of claim 1, further comprising an intermediate layer disposed between the top layer and the bottom layer, the intermediate layer being MOPP.
5. A packaging bag comprising a bag body, wherein the bag body is made of the composite film according to any one of claims 1 to 4.
6. A method of producing a composite film according to any one of claims 1 to 4, comprising the steps of:
(a1) respectively adding raw materials required by different layers into different extrusion mechanisms to be extruded and molded to form a plurality of single-layer bodies;
(a2) carrying out barrier film coating treatment on part of the single-layer body;
(a3) a plurality of single-layer bodies are compounded into a whole;
(a4) carrying out inflation treatment on the tube blank to form a film body;
(a5) drafting the film body;
the heating temperature of the extrusion mechanism for extruding the single-layer body of the surface layer is 170-190 ℃; the heating temperature of the extrusion mechanism for extruding the bottom layer single-layer body is 130-155 ℃.
7. The method for producing a composite film according to claim 6, wherein in the step (2), the plurality of single layers are integrated by dry compounding, solvent-free compounding or melt compounding.
8. A method of producing the packaging bag of claim 5, comprising the steps of:
(b1) placing a plurality of rolled composite films on a low-tension conveying mechanism of bag making equipment;
(b2) wherein the two composite films are conveyed by the low-tension conveying mechanism to enter the bonding mechanism in an aligned parallel state;
(b3) a plurality of composite films are bonded in a bonding mechanism;
(b4) and the blanking mechanism cuts the bonded packaging bag.
9. The method for producing packaging bags according to claim 8, wherein in the step (b3), a heating module is provided in the bonding mechanism, and the heating temperature of the heating module is 150-.
10. The method for producing a packaging bag according to any one of claims 8 to 9, wherein in the step (b3), an ultrasonic module is provided in the bonding mechanism, and the ultrasonic frequency of the ultrasonic module is 15 to 20 KHz.
CN202110913902.4A 2021-08-10 2021-08-10 Composite film and packaging bag and production method thereof Pending CN113619239A (en)

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