CN108189506B - Heat-sealing repeated easy-to-tear PE film and preparation method thereof - Google Patents

Heat-sealing repeated easy-to-tear PE film and preparation method thereof Download PDF

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CN108189506B
CN108189506B CN201810041334.1A CN201810041334A CN108189506B CN 108189506 B CN108189506 B CN 108189506B CN 201810041334 A CN201810041334 A CN 201810041334A CN 108189506 B CN108189506 B CN 108189506B
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parts
layer
10min
density
film
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CN108189506A (en
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吴伟
张贵金
王茂强
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Qingdao East China Sea Packaging Industry Co Ltd
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Qingdao East China Sea Packaging Industry Co Ltd
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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
    • 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
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • 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
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/22—Layered products comprising a layer of synthetic resin characterised by the use of special additives using plasticisers
    • 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
    • B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
    • C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/08—Macromolecular additives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J153/00—Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
    • C09J153/02—Vinyl aromatic monomers and conjugated dienes
    • 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
    • B32B2307/31—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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/16—Applications used for films
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/06—Properties of polyethylene
    • C08L2207/066—LDPE (radical process)
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/304—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive being heat-activatable, i.e. not tacky at temperatures inferior to 30°C

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Laminated Bodies (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

The invention discloses a heat-sealing repeated easy-to-tear PE film which comprises an inner layer, a middle layer and a surface layer which are sequentially overlapped, wherein the inner layer comprises 1.5-3 parts of melt fingers of 2g/10min, and the density of 0.926g/cm3The LDPE, 3-6 parts of melt index are 2g/10min, and the density is 0.921g/cm3The LLDPE and 3-6 parts of melt index are 2g/10min and the density is 0.905g/cm3The middle layer material comprises 10 parts by weight of melting index of 4g/10min and the density of 0.920g/cm3The LDPE comprises 10 parts by weight of hot melt adhesive, the hot melt adhesive comprises 3-6 parts of styrene-ethylene-styrene segmented copolymer, 1.5-3 parts of rosin resin and 1.5-3 parts of acrylonitrile-butadiene-styrene copolymer, the surface layer comprises 1.5-3 parts of melt fingers, the melt fingers are 2g/10min, and the density is 0.926g/cm3The LDPE, 3.5-7 parts of melt index are 2g/10min, and the density is 0.921g/cm3And 0.08 part of PPA master batch. The invention solves the problems that the gap is torn on the PE film composite bag, and the residual product is not easy to seal for storage and fresh-keeping.

Description

Heat-sealing repeated easy-to-tear PE film and preparation method thereof
Technical Field
The invention relates to the technical field of films, in particular to a PE film capable of being repeatedly and easily torn off in a heat sealing manner and a preparation method thereof.
Background
The PE film, namely the polyethylene film, is commonly used for packaging various foods, and has the characteristics of rich raw material resources, moderate price, stable and reliable production process, superior comprehensive performance of products and the like, so that the application range of the PE film is gradually expanded, and particularly in the field of packaging and protection films, the PE film is superior to other materials in cost performance, and the dosage of the PE film always accounts for the first of general packaging materials. Traditional PE membrane is after making PE membrane composite bag, after filling the product, and the heat-seal seals, and preservation that can be fine and keeping product quality, the hot banding can not be torn open when using the product, and the consumer need tear the breach on PE membrane composite bag, takes the product from the breach, but when the product can not once use the end, remaining product is difficult for sealing the preservation and keep fresh.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the PE film which can be repeatedly and easily taken off by heat sealing, can achieve the effect of heat sealing of a PE film heat sealing bag or a PE film composite bag, can achieve the effect of sealing again after heat sealing or manual pressing, does not need to tear a notch on the PE film composite bag, is convenient and sanitary, and can be repeatedly used.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a PE membrane is easily torn off repeatedly to heat-seal, includes inlayer, intermediate level and the top layer that superposes the setting in proper order, the inlayer includes the component of following part by weight: 1.5-3 parts of melt index is 2g/10min, and the density is 0.926g/cm3The LDPE, 3-6 parts of melt index are 2g/10min, and the density is 0.921g/cm3The LLDPE and 3-6 parts of melt index are 2g/10min and the density is 0.905g/cm3The intermediate layer comprises an intermediate layer I material and an intermediate layer II material, wherein the intermediate layer I material comprises 10 parts by weight of a melt index of 4g/10min and a density of 0.920g/cm3The LDPE comprises 10 parts by weight of hot melt adhesive, and the surface layer comprises the following components in parts by weight: 1.5-3 parts of melt index is 2g/10min, and the density is 0.926g/cm3The melt index of the LDPE and 3.5-7 parts of the melt index is 2g/10min, and the density is 0.921g/cm3The LLDPE of (1).
By adopting the technical scheme, the PE film which is repeatedly and easily torn off by heat sealing is divided into the surface layer, the middle layer and the inner layer, so that the structural strength of the PE film which is repeatedly and easily torn off by heat sealing can be increased, the PE film which is repeatedly and easily torn off by heat sealing is provided with necessary anti-impact pressure capability so as to maintain the normal use of the PE film which is repeatedly and easily torn off by heat sealing, the LDPE (low-density polyethylene) is suitable for thermoplastic forming and processing, and can bring better forming processability and thermoplasticity for the inner layer, the middle layer and the surface layer, the LLDPE (linear low-density polyethylene) has higher softening temperature and melting temperature compared with the LDPE, and also has the advantages of high strength, good toughness, high rigidity, heat resistance and good cold resistance, the metallocene has the characteristic of effectively improving the performance of a packaging material, reducing the phenomenon of permeation and breakage, and has excellent heat sealability, and the bonding degree of the inner layer and the surface layer of the hot melt adhesive can, the effect that the PE film can be repeatedly torn off and then sealed through heat sealing or manual extrusion is achieved.
The invention is further configured to: the hot melt adhesive comprises the following components in parts by weight: 3-6 parts of styrene-ethylene-styrene segmented copolymer, 1.5-3 parts of plasticizer and 1.5-3 parts of toughening agent.
By adopting the technical scheme, the styrene-ethylene-styrene segmented copolymer is used as the matrix resin, the plasticizer can increase the flexibility of the matrix resin, the toughening agent can reduce the problems of low elongation and high brittleness of the matrix resin, the cracking of the middle layer caused by the cracks generated when the bonding part bears external force is prevented, the toughness can be increased by the toughening agent, and the bearing strength is improved.
The invention is further configured to: the plasticizer refers to rosin resin.
By adopting the technical scheme, the rosin resin can not only increase the flexibility of the matrix resin, but also increase the viscosity of the matrix resin, so that the hot melt adhesive has viscosity continuously.
The invention is further configured to: the toughening agent is acrylonitrile-butadiene-styrene copolymer.
By adopting the technical scheme, the acrylonitrile-butadiene-styrene copolymer has high strength, good toughness, easy processing and forming and strong impact resistance, and can not be influenced when the PE film is repeatedly torn off and heat-sealed and repeatedly and easily torn off.
The invention is further configured to: 0.08 part of PPA master batch is added into the inner layer and the surface layer respectively.
By adopting the technical scheme, the PPA is a processing aid which does not influence the physical and mechanical properties of the matrix resin, can improve the surface smoothness and the surface smoothness of the PE film which is repeatedly and easily torn by heat sealing, improves the surface quality of the PE film which is repeatedly and easily torn by heat sealing, and improves the thickness uniformity and the thickness stability of the film.
The invention is further configured to: the PPA master batch is prepared by uniformly stirring 95 parts of LLDPE particles and 5 parts of PPA powder, adding into a double-screw extruder, and extruding and granulating to obtain the PPA master batch with the PPA content of 5%.
Aiming at the defects in the prior art, the invention also aims to provide the PE film which can be repeatedly and easily taken off by heat sealing and the preparation method thereof, can achieve the effect of heat sealing of a PE film heat sealing bag or a PE film composite bag, achieves the effect of sealing again after heat sealing or manual pressing, does not need to tear a notch on the PE film composite bag, is convenient and sanitary, and can be repeatedly used, and comprises the following steps:
(1) and (3) heating: the temperature rise mode is a zone-dividing continuous temperature rise, the total temperature rise time is 180-220 min, and the final temperature reaches 160-175 ℃ of the inner layer host, 30-150 ℃ of the middle layer host, 160-175 ℃ of the surface layer host and 160-165 ℃ of the die head;
(2) preparing materials: the ingredients of the materials of the inner layer, the surface layer and the middle layer I are respectively put into a three-layer co-extrusion film blowing machine set for spitting according to the formula, and the interlayer proportion is set to be 1:1: 1;
(3) starting up: starting the machine in sequence of a surface layer, a middle layer and an inner layer at intervals of 1-2 minutes;
(4) melt extrusion: the melting temperature is controlled to be 140-250 ℃, and when the extrusion weight reaches 60kg, the material I in the middle layer is replaced by the material II in the middle layer for continuous melt extrusion;
(5) leading the film: controlling the frequency of a rotary air shaft air cooler to be 10 Hz-60 Hz, drawing upwards and rapidly kneading melt adhesive, ensuring that the drawing speed is 30-40 m/min, injecting compressed air into a die head inflation inlet, controlling the blow-up ratio to be 1.5-3.5, and uniformly drawing up the bubble by a pre-arranged drawing rope;
(6) slitting and rolling: the bubble enters a corona machine through a guide roller, then enters a winding roller machine through a deviation-correcting clamping piece, is cut into two pieces and is wound by a paper core;
(7) stopping the machine: and (5) turning off a corona machine power supply and turning off a main machine power switch.
By adopting the technical scheme, the thickness and the width of the prepared PE film meet the specified requirements, the PE film has good plasticizing performance, a flat and smooth surface without wrinkles, bubbles and perforation cracks, and also has quite excellent mechanical strength, toughness and softer and smoother hand feeling, resin is easy to decompose due to overhigh extrusion temperature, the PE film is brittle, the longitudinal tensile strength is low, the temperature rise time is set to be 180-220 min, the interior of a three-layer co-extrusion film blowing machine set can be completely and uniformly heated, poor resin plasticizing can be caused due to overlow extrusion temperature, the tensile strength, the surface gloss and the transparency of the PE film are reduced, therefore, the extrusion temperature is controlled to be between 140 ℃ and 250 ℃, the traction speed is ensured to be 30-40 m/min, the too fast traction can be prevented, the longitudinal tensile strength of the PE film is increased, the thickness is reduced, the too slow traction can be prevented, and the longitudinal tensile strength of the PE film is reduced, the thickness increases, and the inflation ratio is the ratio between the diameter of the film bubble after the inflation and the pipe diameter that does not blow up, and the increase of inflation ratio can improve the transverse strength of PE membrane, but the inflation ratio is too big can cause the film bubble unstable, and the easy fold of film, therefore the inflation ratio control is preferred between 1.5 ~ 3.5.
The invention is further configured to: and (2) the three-layer co-extrusion film blowing unit heated in the step (1) needs to be insulated for 20-30 min.
Through adopting above-mentioned technical scheme, with the temperature intensification of three-layer coextrusion blown film unit accomplish the back, keep warm 20 ~ 30min with it, can make the temperature of each layer host computer more even, make each district be heated completely, prevent in production process because three-layer coextrusion blown film unit is heated inhomogeneously and leads to product quality not good.
The invention is further configured to: and (4) replacing each layer of filter screen before starting the machine in the step (3), and opening a fan to clean the die lip.
Through adopting above-mentioned technical scheme, changing used filter screen, can preventing that the mesh on the filter screen after using from blockking up, influencing the use of filter screen, utilize the fan to carry out wind-force clearance to wind ring wind gap, can ensure that wind ring wind gap is free from foreign object and blocks up, clean bush die lip can prevent that gel and impurity from sticking on the die lip of bush.
The invention is further configured to: and (4) using a double-thread screw for the main machine screw in the step (4), and additionally arranging a circulating water temperature control system and a metering and feeding device on the main machine.
Through adopting above-mentioned technical scheme, the comparatively stable transmission of the molten state material of extruding can be come out to the double thread screw rod, and the plastify is good, has better processing effect, adds circulating water temperature control system on the host computer, can reach the controllable effect of temperature, and measurement feeding device can guarantee that the effect is taken off easily in intermediate level, guarantees that it reaches sufficient thickness.
In conclusion, the invention has the following beneficial effects: the PE film prepared by the invention can be repeatedly and easily removed by heat sealing, can be removed from a sealing position after the PE film is subjected to heat sealing or the PE film composite bag is subjected to heat sealing, and can be sealed again after heat sealing or manual pressing, is convenient and sanitary, can be repeatedly used, and has better impact strength and tearing strength, higher softness, smoothness and better hand feeling.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The first embodiment is as follows: the utility model provides a PE membrane is easily torn off repeatedly to heat-seal, includes inlayer, intermediate level and the top layer that superposes the setting in proper order, the inlayer includes the component of following part by weight: 1.5 parts of melt index is 2g/10min, and the density is 0.926g/cm3The LDPE and 3 parts of melt index are 2g/10min, and the density is 0.921g/cm3The LLDPE and 3 parts of melt index of the polyurethane are 2g/10min and the density is 0.905g/cm3The intermediate layer comprises an intermediate layer I material and an intermediate layer II material, the intermediate layer I material comprises 10 parts by weight of a melt index of 4g/10min and a density of 0.920g/cm3The LDPE comprises 3 parts of styrene-ethylene-styrene segmented copolymer, 1.5 parts of rosin resin and 1.5 parts of acrylonitrile-butadiene-styrene copolymer in parts by weight, and the surface layer comprises the following components in parts by weight: 1.5 parts of melt index is 2g/10min, and the density is 0.926g/cm3The LDPE and 3.5 parts of melt index are 2g/10min, and the density is 0.921g/cm3And 0.08 part of PPA master batch.
The preparation method of the heat-seal repeated easy-uncovering PE film comprises the following steps:
(1) and (3) heating: the temperature rise mode is a subarea continuous temperature rise mode, the total temperature rise time is 180-220 min, the final temperature reaches 160 ℃, 170 ℃, 175 ℃, and 170 ℃ in the 1 region, 170 ℃ in the 2 region, 175 ℃, and 170 ℃ in the 4 region, 30 ℃, 90 ℃, 100 ℃ in the 3 region, 130 ℃ in the 4 region, and 150 ℃ in the 5 region of the inner layer host, 160 ℃, 170 ℃ in the 2 region, 175 ℃, and 170 ℃ in the 1 region, 175 ℃, 165 ℃ in the 4 region, and 165 ℃ in the 5 region of the surface layer host, 160 ℃, 165 ℃ in the 2 region, 165 ℃ in the 3 region, 165 ℃ in the 4 region, and 165 ℃ in the 5 region of the;
(2) preparing materials: the ingredients of the materials of the inner layer, the surface layer and the middle layer I are respectively put into a three-layer co-extrusion film blowing machine set for spitting according to the formula, and the interlayer proportion is set to be 1:1: 1;
(3) starting up: starting up the machine in sequence of a surface layer, an intermediate layer and an inner layer at intervals of 1-2 minutes, keeping a low rotating speed when a host machine is started up, controlling the rotating speed to be 20-30 r/min, replacing each layer of filter screen before starting up the machine, opening a fan, checking an air ring air opening, cleaning a neck mold lip, and wetting the neck mold lip by paraffin;
(4) melt extrusion: the melting temperature is controlled to be 140-250 ℃, when the extrusion weight reaches 60kg, the material I in the middle layer is changed into the material II in the middle layer to continue to be melted and extruded, wherein a double-thread screw is used as a main machine screw for extrusion, and a circulating water temperature control system and a metering feeding device are additionally arranged on the main machine;
(5) leading the film: controlling the frequency of a rotary air shaft air cooler to be 10 Hz-60 Hz, drawing upwards and rapidly kneading melt adhesive, ensuring that the drawing speed is 30-40 m/min, injecting compressed air into an inflation inlet of a die head, controlling the inflation ratio to be 1.5-3.5, uniformly drawing up a film bubble by a pre-placed drawing rope, and putting operators on rubber hanging gloves or heat insulation leather gloves when drawing the film, wearing long-sleeve work clothes and making protection;
(6) slitting and rolling: the bubble enters a corona machine through a guide roller, then enters a winding roller machine through a deviation-rectifying clamping piece, is cut into two pieces and wound by a paper core, and then is inflated and clamped by an inflatable shaft;
(7) stopping the machine: setting the temperature of each host to be 100-120 ℃; and setting the temperature of the die head to be reduced to 110-120 ℃, reducing the revolution of each layer of main engine to 20-30 revolutions/min, adjusting the traction speed to 10-15 m/min to ensure that the film bubble is not broken, and turning off a corona power supply and turning off a main engine power switch when the shutdown material is completely extruded.
Example two: the utility model provides a PE membrane is easily torn off repeatedly to heat-seal, includes inlayer, intermediate level and the top layer that superposes the setting in proper order, the inlayer includes the component of following part by weight: 1.8 parts of melt index is 2g/10min, and the density is 0.926g/cm3The LDPE and 3.6 parts of melt index are 2g/10min, and the density is 0.921g/cm3The LLDPE and 3.6 parts of melt index of 2g/10min and the density of 0.905g/cm3The intermediate layer comprises an intermediate layer I material and an intermediate layer II material, the intermediate layer I material comprises 10 parts by weight of a melt index of 4g/10min and a density of 0.920g/cm3The LDPE comprises 4 parts of styrene-ethylene-styrene segmented copolymer, 2 parts of rosin resin and 2 parts of acrylonitrile-butadiene-styrene copolymer in parts by weight, and the surface layer comprises the following components in parts by weight: 1.8 parts of melt index is 2g/10min, and the density is 0.926g/cm3The melt index of 4.2 parts of the LDPE is 2g/10min, and the density is 0.921g/cm3And 0.08 part of PPA master batch.
The preparation method of the heat-seal repeated easy-uncovering PE film comprises the following steps:
(1) and (3) heating: the temperature rise mode is a subarea continuous temperature rise mode, the total temperature rise time is 180-220 min, the final temperature reaches 160 ℃, 170 ℃, 175 ℃, and 170 ℃ in the 1 region, 170 ℃ in the 2 region, 175 ℃, and 170 ℃ in the 4 region, 30 ℃, 90 ℃, 100 ℃ in the 3 region, 130 ℃ in the 4 region, and 150 ℃ in the 5 region of the inner layer host, 160 ℃, 170 ℃ in the 2 region, 175 ℃, and 170 ℃ in the 1 region, 175 ℃, 165 ℃ in the 4 region, and 165 ℃ in the 5 region of the surface layer host, 160 ℃, 165 ℃ in the 2 region, 165 ℃ in the 3 region, 165 ℃ in the 4 region, and 165 ℃ in the 5 region of the;
(2) preparing materials: the ingredients of the materials of the inner layer, the surface layer and the middle layer I are respectively put into a three-layer co-extrusion film blowing machine set for spitting according to the formula, and the interlayer proportion is set to be 1:1: 1;
(3) starting up: starting up the machine in sequence of a surface layer, an intermediate layer and an inner layer at intervals of 1-2 minutes, keeping a low rotating speed when a host machine is started up, controlling the rotating speed to be 20-30 r/min, replacing each layer of filter screen before starting up the machine, opening a fan, checking an air ring air opening, cleaning a neck mold lip, and wetting the neck mold lip by paraffin;
(4) melt extrusion: the melting temperature is controlled to be 140-250 ℃, when the extrusion weight reaches 60kg, the material I in the middle layer is changed into the material II in the middle layer to continue to be melted and extruded, wherein a double-thread screw is used as a main machine screw for extrusion, and a circulating water temperature control system and a metering feeding device are additionally arranged on the main machine;
(5) leading the film: controlling the frequency of a rotary air shaft air cooler to be 10 Hz-60 Hz, drawing upwards and rapidly kneading melt adhesive, ensuring that the drawing speed is 30-40 m/min, injecting compressed air into an inflation inlet of a die head, controlling the inflation ratio to be 1.5-3.5, uniformly drawing up a film bubble by a pre-placed drawing rope, and putting operators on rubber hanging gloves or heat insulation leather gloves when drawing the film, wearing long-sleeve work clothes and making protection;
(6) slitting and rolling: the bubble enters a corona machine through a guide roller, then enters a winding roller machine through a deviation-rectifying clamping piece, is cut into two pieces and wound by a paper core, and then is inflated and clamped by an inflatable shaft;
(7) stopping the machine: setting the temperature of each host to be 100-120 ℃; and setting the temperature of the die head to be reduced to 110-120 ℃, reducing the revolution of each layer of main engine to 20-30 revolutions/min, adjusting the traction speed to 10-15 m/min to ensure that the film bubble is not broken, and turning off a corona power supply and turning off a main engine power switch when the shutdown material is completely extruded.
Example three: the utility model provides a PE membrane is easily torn off repeatedly to heat-seal, includes inlayer, intermediate level and the top layer that superposes the setting in proper order, the inlayer includes the component of following part by weight: 2 parts of melt index is 2g/10min, and the density is 0.926g/cm3The LDPE and 4 parts of melt index are 2g/10min, and the density is 0.921g/cm3The LLDPE and 4 parts of melt index of the polyurethane are 2g/10min and the density is 0.905g/cm3The intermediate layer comprises an intermediate layer I material and an intermediate layer II material, the intermediate layer I material comprises 10 parts by weight of a melt index of 4g/10min and a density of 0.920g/cm3The second material of the middle layer comprises 4.5 parts by weight of styrene-ethylene-styrene segmented copolymer, 2.25 parts by weight of rosin resin,2.25 parts of an acrylonitrile-butadiene-styrene copolymer, wherein the surface layer comprises the following components in parts by weight: 2 parts of melt index is 2g/10min, and the density is 0.926g/cm3The melt index of 4.7 parts of the LDPE is 2g/10min, and the density is 0.921g/cm3And 0.08 part of PPA master batch.
The preparation method of the heat-seal repeated easy-uncovering PE film comprises the following steps:
(1) and (3) heating: the temperature rise mode is a subarea continuous temperature rise mode, the total temperature rise time is 180-220 min, the final temperature reaches 160 ℃, 170 ℃, 175 ℃, and 170 ℃ in the 1 region, 170 ℃ in the 2 region, 175 ℃, and 170 ℃ in the 4 region, 30 ℃, 90 ℃, 100 ℃ in the 3 region, 130 ℃ in the 4 region, and 150 ℃ in the 5 region of the inner layer host, 160 ℃, 170 ℃ in the 2 region, 175 ℃, and 170 ℃ in the 1 region, 175 ℃, 165 ℃ in the 4 region, and 165 ℃ in the 5 region of the surface layer host, 160 ℃, 165 ℃ in the 2 region, 165 ℃ in the 3 region, 165 ℃ in the 4 region, and 165 ℃ in the 5 region of the;
(2) preparing materials: the ingredients of the materials of the inner layer, the surface layer and the middle layer I are respectively put into a three-layer co-extrusion film blowing machine set for spitting according to the formula, and the interlayer proportion is set to be 1:1: 1;
(3) starting up: starting up the machine in sequence of a surface layer, an intermediate layer and an inner layer at intervals of 1-2 minutes, keeping a low rotating speed when a host machine is started up, controlling the rotating speed to be 20-30 r/min, replacing each layer of filter screen before starting up the machine, opening a fan, checking an air ring air opening, cleaning a neck mold lip, and wetting the neck mold lip by paraffin;
(4) melt extrusion: the melting temperature is controlled to be 140-250 ℃, when the extrusion weight reaches 60kg, the material I in the middle layer is changed into the material II in the middle layer to continue to be melted and extruded, wherein a double-thread screw is used as a main machine screw for extrusion, and a circulating water temperature control system and a metering feeding device are additionally arranged on the main machine;
(5) leading the film: controlling the frequency of a rotary air shaft air cooler to be 10 Hz-60 Hz, drawing upwards and rapidly kneading melt adhesive, ensuring that the drawing speed is 30-40 m/min, injecting compressed air into an inflation inlet of a die head, controlling the inflation ratio to be 1.5-3.5, uniformly drawing up a film bubble by a pre-placed drawing rope, and putting operators on rubber hanging gloves or heat insulation leather gloves when drawing the film, wearing long-sleeve work clothes and making protection;
(6) slitting and rolling: the bubble enters a corona machine through a guide roller, then enters a winding roller machine through a deviation-rectifying clamping piece, is cut into two pieces and wound by a paper core, and then is inflated and clamped by an inflatable shaft;
(7) stopping the machine: setting the temperature of each host to be 100-120 ℃; and setting the temperature of the die head to be reduced to 110-120 ℃, reducing the revolution of each layer of main engine to 20-30 revolutions/min, adjusting the traction speed to 10-15 m/min to ensure that the film bubble is not broken, and turning off a corona power supply and turning off a main engine power switch when the shutdown material is completely extruded.
Example four: the utility model provides a PE membrane is easily torn off repeatedly to heat-seal, includes inlayer, intermediate level and the top layer that superposes the setting in proper order, the inlayer includes the component of following part by weight: 2.4 parts of melt index is 2g/10min, and the density is 0.926g/cm3The melt index of 4.8 parts of the LDPE is 2g/10min, and the density is 0.921g/cm3The LLDPE and 4.8 parts of melt index of the polyurethane are 2g/10min and the density is 0.905g/cm3The intermediate layer comprises an intermediate layer I material and an intermediate layer II material, the intermediate layer I material comprises 10 parts by weight of a melt index of 4g/10min and a density of 0.920g/cm3The LDPE comprises 5 parts of styrene-ethylene-styrene segmented copolymer, 2.5 parts of rosin resin and 2.5 parts of acrylonitrile-butadiene-styrene copolymer in parts by weight, and the surface layer comprises the following components in parts by weight: 2.5 parts of melt index is 2g/10min, and the density is 0.926g/cm3The LDPE and 5.8 parts of melt index are 2g/10min, and the density is 0.921g/cm3And 0.08 part of PPA master batch.
The preparation method of the heat-seal repeated easy-uncovering PE film comprises the following steps:
(1) and (3) heating: the temperature rise mode is a subarea continuous temperature rise mode, the total temperature rise time is 180-220 min, the final temperature reaches 160 ℃, 170 ℃, 175 ℃, and 170 ℃ in the 1 region, 170 ℃ in the 2 region, 175 ℃, and 170 ℃ in the 4 region, 30 ℃, 90 ℃, 100 ℃ in the 3 region, 130 ℃ in the 4 region, and 150 ℃ in the 5 region of the inner layer host, 160 ℃, 170 ℃ in the 2 region, 175 ℃, and 170 ℃ in the 1 region, 175 ℃, 165 ℃ in the 4 region, and 165 ℃ in the 5 region of the surface layer host, 160 ℃, 165 ℃ in the 2 region, 165 ℃ in the 3 region, 165 ℃ in the 4 region, and 165 ℃ in the 5 region of the;
(2) preparing materials: the ingredients of the materials of the inner layer, the surface layer and the middle layer I are respectively put into a three-layer co-extrusion film blowing machine set for spitting according to the formula, and the interlayer proportion is set to be 1:1: 1;
(3) starting up: starting up the machine in sequence of a surface layer, an intermediate layer and an inner layer at intervals of 1-2 minutes, keeping a low rotating speed when a host machine is started up, controlling the rotating speed to be 20-30 r/min, replacing each layer of filter screen before starting up the machine, opening a fan, checking an air ring air opening, cleaning a neck mold lip, and wetting the neck mold lip by paraffin;
(4) melt extrusion: the melting temperature is controlled to be 140-250 ℃, when the extrusion weight reaches 60kg, the material I in the middle layer is changed into the material II in the middle layer to continue to be melted and extruded, wherein a double-thread screw is used as a main machine screw for extrusion, and a circulating water temperature control system and a metering feeding device are additionally arranged on the main machine;
(5) leading the film: controlling the frequency of a rotary air shaft air cooler to be 10 Hz-60 Hz, drawing upwards and rapidly kneading melt adhesive, ensuring that the drawing speed is 30-40 m/min, injecting compressed air into an inflation inlet of a die head, controlling the inflation ratio to be 1.5-3.5, uniformly drawing up a film bubble by a pre-placed drawing rope, and putting operators on rubber hanging gloves or heat insulation leather gloves when drawing the film, wearing long-sleeve work clothes and making protection;
(6) slitting and rolling: the bubble enters a corona machine through a guide roller, then enters a winding roller machine through a deviation-rectifying clamping piece, is cut into two pieces and wound by a paper core, and then is inflated and clamped by an inflatable shaft;
(7) stopping the machine: setting the temperature of each host to be 100-120 ℃; and setting the temperature of the die head to be reduced to 110-120 ℃, reducing the revolution of each layer of main engine to 20-30 revolutions/min, adjusting the traction speed to 10-15 m/min to ensure that the film bubble is not broken, and turning off a corona power supply and turning off a main engine power switch when the shutdown material is completely extruded.
Example five: the utility model provides a PE membrane is easily torn off repeatedly to heat-seal, includes inlayer, intermediate level and the top layer that superposes the setting in proper order, the inlayer includes the component of following part by weight: 2.8 parts of melt index is 2g/10min, and the density is 0.926g/cm3The LDPE and 5.6 parts of melt index are 2g/10min, and the density is 0.921g/cm3The LLDPE and 5.6 parts of melt index of 2g/10min and the density of 0.905g/cm3The intermediate layer comprises an intermediate layer I material and an intermediate layer II material, the intermediate layer I material comprises 10 parts by weight of a melt index of 4g/10min and a density of 0.920g/cm3The LDPE comprises 5.5 parts of styrene-ethylene-styrene segmented copolymer, 2.75 parts of rosin resin and 2.75 parts of acrylonitrile-butadiene-styrene copolymer in parts by weight, and the surface layer comprises the following components in parts by weight: 2.8 parts of melt index is 2g/10min, and the density is 0.926g/cm3The melt index of 6.5 parts of the LDPE is 2g/10min, and the density is 0.921g/cm3And 0.08 part of PPA master batch.
The preparation method of the heat-seal repeated easy-uncovering PE film comprises the following steps:
(1) and (3) heating: the temperature rise mode is a subarea continuous temperature rise mode, the total temperature rise time is 180-220 min, the final temperature reaches 160 ℃, 170 ℃, 175 ℃, and 170 ℃ in the 1 region, 170 ℃ in the 2 region, 175 ℃, and 170 ℃ in the 4 region, 30 ℃, 90 ℃, 100 ℃ in the 3 region, 130 ℃ in the 4 region, and 150 ℃ in the 5 region of the inner layer host, 160 ℃, 170 ℃ in the 2 region, 175 ℃, and 170 ℃ in the 1 region, 175 ℃, 165 ℃ in the 4 region, and 165 ℃ in the 5 region of the surface layer host, 160 ℃, 165 ℃ in the 2 region, 165 ℃ in the 3 region, 165 ℃ in the 4 region, and 165 ℃ in the 5 region of the;
(2) preparing materials: the ingredients of the materials of the inner layer, the surface layer and the middle layer I are respectively put into a three-layer co-extrusion film blowing machine set for spitting according to the formula, and the interlayer proportion is set to be 1:1: 1;
(3) starting up: the method comprises the following steps that the sequence of starting is a surface layer, an intermediate layer and an inner layer, the surface layer, the intermediate layer and the inner layer are started at intervals of 1-2 minutes, the rotating speed of a host computer is required to be kept low when the host computer is started, the rotating speed is controlled to be 20-30 revolutions per minute, an ammeter and a pressure gauge are observed, the current and the pressure of the host computer are ensured not to exceed the range of technological requirements, the rotating speed of the host computer can be slowly increased, each layer of filter screen needs to be replaced before starting, a fan is started, an air ring air;
(4) melt extrusion: the melting temperature is controlled to be 140-250 ℃, when the extrusion weight reaches 60kg, the material I in the middle layer is changed into the material II in the middle layer to continue to be melted and extruded, wherein a double-thread screw is used as a main machine screw for extrusion, and a circulating water temperature control system and a metering feeding device are additionally arranged on the main machine;
(5) leading the film: controlling the frequency of a rotary air shaft air cooler to be 10 Hz-60 Hz, drawing upwards and rapidly kneading melt adhesive, ensuring that the drawing speed is 30-40 m/min, injecting compressed air into an inflation inlet of a die head, controlling the inflation ratio to be 1.5-3.5, uniformly drawing up a film bubble by a pre-placed drawing rope, and putting operators on rubber hanging gloves or heat insulation leather gloves when drawing the film, wearing long-sleeve work clothes and making protection;
(6) slitting and rolling: the bubble enters a corona machine through a guide roller, then enters a winding roller machine through a deviation-rectifying clamping piece, is cut into two pieces and wound by a paper core, and then is inflated and clamped by an inflatable shaft;
(7) stopping the machine: setting the temperature of each host to be 100-120 ℃; and setting the temperature of the die head to be reduced to 110-120 ℃, reducing the revolution of each layer of main engine to 20-30 revolutions/min, adjusting the traction speed to 10-15 m/min to ensure that the film bubble is not broken, and turning off a corona power supply and turning off a main engine power switch when the shutdown material is completely extruded.
Example six: the utility model provides a PE membrane is easily torn off repeatedly to heat-seal, includes inlayer, intermediate level and the top layer that superposes the setting in proper order, the inlayer includes the component of following part by weight: 3 parts of melt index is 2g/10min, and the density is 0.926g/cm3The LDPE and 6 parts of melt index are 2g/10min, and the density is 0.921g/cm3The LLDPE and 6 parts of melt index of the polyurethane are 2g/10min and the density is 0.905g/cm3The intermediate layer comprises an intermediate layer I material and an intermediate layer II material, the intermediate layer I material comprises 10 parts by weight of a melt index of 4g/10min and a density of 0.920g/cm3The LDPE comprises 6 parts of styrene-ethylene-styrene segmented copolymer, 3 parts of rosin resin and 3 parts of acrylonitrile-butadiene-styrene copolymer in parts by weight, and the surface layer comprises the following components in parts by weight: 3 parts of melt index is 2g/10min, and the density is 0.926g/cm3The LDPE and 7 parts of melt index are 2g/10min, and the density is 0.921g/cm3And 0.08 part of PPA master batch.
The preparation method of the heat-seal repeated easy-uncovering PE film comprises the following steps:
(1) and (3) heating: the temperature rise mode is a subarea continuous temperature rise mode, the total temperature rise time is 180-220 min, the final temperature reaches 160 ℃, 170 ℃, 175 ℃, and 170 ℃ in the 1 region, 170 ℃ in the 2 region, 175 ℃, and 170 ℃ in the 4 region, 30 ℃, 90 ℃, 100 ℃ in the 3 region, 130 ℃ in the 4 region, and 150 ℃ in the 5 region of the inner layer host, 160 ℃, 170 ℃ in the 2 region, 175 ℃, and 170 ℃ in the 1 region, 175 ℃, 165 ℃ in the 4 region, and 165 ℃ in the 5 region of the surface layer host, 160 ℃, 165 ℃ in the 2 region, 165 ℃ in the 3 region, 165 ℃ in the 4 region, and 165 ℃ in the 5 region of the;
(2) preparing materials: the ingredients of the materials of the inner layer, the surface layer and the middle layer I are respectively put into a three-layer co-extrusion film blowing machine set for spitting according to the formula, and the interlayer proportion is set to be 1:1: 1;
(3) starting up: the method comprises the following steps that the sequence of starting is a surface layer, an intermediate layer and an inner layer, the surface layer, the intermediate layer and the inner layer are started at intervals of 1-2 minutes, the rotating speed of a host computer is required to be kept low when the host computer is started, the rotating speed is controlled to be 20-30 revolutions per minute, an ammeter and a pressure gauge are observed, the current and the pressure of the host computer are ensured not to exceed the range of technological requirements, the rotating speed of the host computer can be slowly increased, each layer of filter screen needs to be replaced before starting, a fan is started, an air ring air;
(4) melt extrusion: the melting temperature is controlled to be 140-250 ℃, when the extrusion weight reaches 60kg, the material I in the middle layer is changed into the material II in the middle layer to continue to be melted and extruded, wherein a double-thread screw is used as a main machine screw for extrusion, and a circulating water temperature control system and a metering feeding device are additionally arranged on the main machine;
(5) leading the film: controlling the frequency of a rotary air shaft air cooler to be 10 Hz-60 Hz, drawing upwards and rapidly kneading melt adhesive, ensuring that the drawing speed is 30-40 m/min, injecting compressed air into an inflation inlet of a die head, controlling the inflation ratio to be 1.5-3.5, uniformly drawing up a film bubble by a pre-placed drawing rope, and putting operators on rubber hanging gloves or heat insulation leather gloves when drawing the film, wearing long-sleeve work clothes and making protection;
(6) slitting and rolling: the bubble enters a corona machine through a guide roller, then enters a winding roller machine through a deviation-rectifying clamping piece, is cut into two pieces and wound by a paper core, and then is inflated and clamped by an inflatable shaft;
(7) stopping the machine: setting the temperature of each host to be 100-120 ℃; and setting the temperature of the die head to be reduced to 110-120 ℃, reducing the revolution of each layer of main engine to 20-30 revolutions/min, adjusting the traction speed to 10-15 m/min to ensure that the film bubble is not broken, and turning off a corona power supply and turning off a main engine power switch when the shutdown material is completely extruded.
The product performance of this example was tested, wherein the elongation at break was measured according to GB13022, the tear strength was measured according to GB/T16578, the coefficient of friction was measured according to GB10006, the impact strength was measured according to GB9639A method, the heat seal strength was measured according to QB-75041166-9-02 at 110 deg.C, 115 deg.C and 120 deg.C, and the results of the measurements are shown in Table 1.
Table 1 performance testing of the products
As can be seen from Table 1, the product of the present example has good elongation at break and elongation at break, and strong tear resistance, and can avoid tearing and breaking of the PE film when the seal is repeatedly uncovered.
Carry out the heat-seal to the product of this embodiment and seal, test the heat-seal strength and the initial heat-seal peel force of first heat-seal, seal the intensity of sealing that the hand pressure sealed and heat-seal sealed respectively test after tearing open the seal, the manual pressure sealed again that seals and heat-seal sealed of branch again seals the peel force and tests, and the test result sees table 2.
TABLE 2 Heat seal Strength and Peel force test
As can be seen from Table 2, the heat-seal strength at the initial heat-seal sealing is more than 15N, so that the product can be well preserved without leaking; the initial heat-sealing peeling force is below 19N, so that the effect of easily tearing off the seal can be realized; when hand-press sealing is used, the sealing strength is between 3N and 4N, and the product can be sealed and stored again only by slightly pinching; meanwhile, the strength of the seal is not too high, and the seal is easily uncovered when the seal is peeled off; when the heat sealing is carried out again, the sealing strength is not high and is between 6N and 7N, the peeling force after the heat sealing is carried out again is also between 6N and 7N, the sealing is easy to uncover, and the heat sealing device is simple, sanitary and reusable.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims (8)

1. The utility model provides a PE membrane is easily torn off repeatedly to heat-seal which characterized in that: the composite material comprises an inner layer, a middle layer and a surface layer which are sequentially stacked, wherein the inner layer comprises the following components in parts by weight: 1.5-3 parts of melt index is 2g/10min, and the density is 0.926g/cm3The LDPE, 3-6 parts of melt index are 2g/10min, and the density is 0.921g/cm3The LLDPE and 3-6 parts of melt index are 2g/10min and the density is 0.905g/cm30.08 part of PPA master batch;
the intermediate layer comprises an intermediate layer I material and an intermediate layer II material, wherein the intermediate layer I material comprises 10 parts by weight of a melt index of 4g/10min and a density of 0.920g/cm3The intermediate layer II comprises 10 parts by weight of hot melt adhesive;
the hot melt adhesive comprises the following components in parts by weight: 3-6 parts of styrene-ethylene-styrene segmented copolymer, 1.5-3 parts of plasticizer and 1.5-3 parts of toughening agent;
the surface layer comprises the following components in parts by weight: 1.5-3 parts of melt index is 2g/10min, and the density is 0.926g/cm3The melt index of the LDPE and 3.5-7 parts of the melt index is 2g/10min, and the density is 0.921g/cm30.08 parts of PPA master batch.
2. The heat-seal repeated easy-release PE film according to claim 1, characterized in that: the plasticizer refers to rosin resin.
3. The heat-seal repeated easy-release PE film according to claim 1, characterized in that: the toughening agent is acrylonitrile-butadiene-styrene copolymer.
4. The heat-seal repeated easy-release PE film according to claim 1, characterized in that: the PPA master batch is prepared by uniformly stirring 95 parts of LLDPE particles and 5 parts of PPA powder, adding into a double-screw extruder, and extruding and granulating to obtain the PPA master batch with the PPA content of 5%.
5. A method for producing a heat-seal repeatedly peelable PE film according to any one of claims 1 to 4, characterized by: the method comprises the following steps:
(1) and (3) heating: the temperature rise mode is a zone-dividing continuous temperature rise, the total temperature rise time is 180-220 min, and the final temperature reaches 160-175 ℃ of the inner layer host, 30-150 ℃ of the middle layer host, 160-175 ℃ of the surface layer host and 160-165 ℃ of the die head;
(2) preparing materials: the ingredients of the materials of the inner layer, the surface layer and the middle layer I are respectively put into a three-layer co-extrusion film blowing machine set for spitting according to the formula, and the interlayer proportion is set to be 1:1: 1;
(3) starting up: starting the machine in sequence of a surface layer, a middle layer and an inner layer at intervals of 1-2 minutes;
(4) melt extrusion: the melting temperature is controlled to be 140-250 ℃, and when the extrusion weight reaches 60kg, the material I in the middle layer is replaced by the material II in the middle layer for continuous melt extrusion;
(5) leading the film: controlling the frequency of a rotary air shaft air cooler to be 10 Hz-60 Hz, drawing upwards and rapidly kneading melt adhesive, ensuring that the drawing speed is 30-40 m/min, injecting compressed air into a die head inflation inlet, controlling the blow-up ratio to be 1.5-3.5, and uniformly drawing up the bubble by a pre-arranged drawing rope;
(6) slitting and rolling: the bubble enters a corona machine through a guide roller, then enters a winding roller machine through a deviation-correcting clamping piece, is cut into two pieces and is wound by a paper core;
(7) stopping the machine: and (5) turning off a corona machine power supply and turning off a main machine power switch.
6. The method for producing a heat-seal repeated easy-release PE film according to claim 5, characterized in that: and (2) the three-layer co-extrusion film blowing unit heated in the step (1) needs to be insulated for 20-30 min.
7. The method for producing a heat-seal repeated easy-release PE film according to claim 5, characterized in that: and (4) replacing each layer of filter screen before starting the machine in the step (3), and opening a fan to clean the die lip.
8. The method for producing a heat-seal repeated easy-release PE film according to claim 5, characterized in that: and (4) using a double-thread screw for the main machine screw in the step (4), and additionally arranging a circulating water temperature control system and a metering and feeding device on the main machine.
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