CN113524832B - Paper-plastic composite packaging material with high air permeability and preparation method thereof - Google Patents

Paper-plastic composite packaging material with high air permeability and preparation method thereof Download PDF

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Publication number
CN113524832B
CN113524832B CN202110642728.4A CN202110642728A CN113524832B CN 113524832 B CN113524832 B CN 113524832B CN 202110642728 A CN202110642728 A CN 202110642728A CN 113524832 B CN113524832 B CN 113524832B
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film
roller
paper
plastic composite
packaging material
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CN113524832A (en
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谢文汇
杨勇
刘学军
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Huangshan Novel Co Ltd
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Huangshan Novel 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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets
    • 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
    • B32B27/06—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
    • B32B27/10—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 paper or cardboard
    • 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
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0008—Electrical discharge treatment, e.g. corona, plasma treatment; wave energy or particle radiation
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/04—Punching, slitting or perforating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/04—Punching, slitting or perforating
    • B32B2038/047—Perforating
    • 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
    • B32B2307/30—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
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • 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
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Plasma & Fusion (AREA)
  • Thermal Sciences (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)

Abstract

The invention provides a high-air-permeability paper-plastic composite packaging material and a preparation method thereof. The preparation method comprises a film blowing production process, a hot needle micropore process and a thermal bonding composite process, wherein the PE film material with high air permeability is obtained by optimizing the formula of the PE film and carrying out micropore treatment on the modified PE film, then the conventional adhesive dry type composite mode and PE particle extrusion composite mode are avoided, the paper-plastic packaging materials are composited by adopting the thermal bonding composite mode, the dry coating or extrusion coating is prevented from blocking micropores on the modified PE film, the PE film material with stable and excellent high air permeability is finally obtained, and the PE film material with excellent heat stability, impact resistance, heat sealing performance and excellent low-temperature bonding performance is further obtained.

Description

Paper-plastic composite packaging material with high air permeability and preparation method thereof
Technical Field
The invention relates to the field of packaging materials, in particular to a paper-plastic composite packaging material with high air permeability and a preparation method thereof.
Background
The paper-plastic composite packaging material is mainly formed by combining two materials with different properties, namely paper and a plastic base material. The paper is made of plant fibers as main raw materials, is a random oriented hierarchical network formed by bonding fibers through hydrogen bonds, and has the characteristics of good stiffness, opacity, easiness in bonding, easiness in printing, excellent air permeability and the like. The polyethylene PE film is a plastic substrate with the widest application in paper-plastic composite packaging, has the advantages of excellent low temperature resistance, good chemical stability, excellent heat sealing performance, good processing performance, good impact strength, excellent flexibility and excellent moisture resistance, and is widely applied as a substrate.
The paper-plastic composite material is applied to the fields of daily necessities, clothing industry, electric elements and the like from the daily necessities to the medical field, and along with the progress and development of technology, the paper-plastic composite packaging material is applied to more and more fields, and the application field and the application range are further expanded when special performance requirements are given.
The paper-plastic composite packaging material is formed by combining paper and plastic (especially polyethylene PE film) through compounding, so that the paper-plastic composite packaging material has the characteristics and advantages of the two different materials. Because the polyethylene PE film has excellent moisture resistance and no air permeability, the paper-plastic packaging material compounded by paper and PE has poor air permeability. In order to meet market demands, the preparation of a paper-plastic packaging material with high air permeability is an urgent problem to be solved by packaging material research and development personnel.
Disclosure of Invention
The invention aims to overcome the defect of poor air permeability of a paper-plastic composite packaging material in the prior art and provides a paper-plastic composite packaging material with high air permeability and a preparation method thereof.
In order to solve the technical problem of the invention, the adopted technical scheme is that the preparation method of the paper-plastic composite packaging material with high air permeability comprises the following steps:
s1, weighing raw materials of corresponding weight components according to the formula composition of a film laminating layer, an intermediate layer and a heat sealing layer, respectively adding the raw materials into three charging barrels of W & H film blowing equipment, mixing and melting the raw materials in the charging barrels to form a tube blank, extruding and expanding the tube blank through a die head of an extruder to form a film bubble, and cooling and shaping the film bubble through an air ring to prepare the polyethylene film;
s2, carrying out corona treatment on the surface of the shaped polyethylene film corona layer to obtain a modified polyethylene film;
s3, treating the modified polyethylene film by adopting a roller pair with a needle, and forming innumerable penetrating pinholes on the surface of the modified polyethylene film;
s4, carrying out heat lamination and compounding on the surface of the lamination layer in the microporous polyethylene film and paper, wherein the heat lamination temperature is 150-170 ℃, the lamination press roll pressure value is 0.7-0.9MPa, and the production speed is 45-55m/min, so that the paper-plastic composite packaging material with high air permeability is prepared.
The preparation method of the paper-plastic composite packaging material with high air permeability is further improved:
preferably, the temperature of the three barrels in the step S1 corresponding to the barrel of the extruder is 150-165 ℃ in the first heating area, 165-175 ℃ in the second heating area, 175-185 ℃ in the third heating area, 165-175 ℃ in the machine head, 170-185 ℃ in the lip die and 170-185 ℃ in the mouth die.
Preferably, the power of the corona treatment in step S2 is 7.5KW.
Preferably, in step S3, the hole punching roller set includes a roller with a needle and a press roller that are used in cooperation, a roller shaft is disposed at the center of the roller with a needle along the axial direction of the roller with a needle, punching needles are uniformly disposed on the outer surface of the roller shaft, the modified polyethylene film enters a gap between the roller with a needle and the press roller by a guide roller, and the roller with a needle and the press roller are meshed with each other at a temperature of 330-350 ℃ to form countless penetrating pinholes on the surface of the modified polyethylene film.
Preferably, the roller with needle is a wool felt roller or a nylon roller.
Preferably, the density of the punching needles on the outer surface of the roller with the needles is 5X 5/mm 2 The diameter of the tip of the perforating needle is 0.5mm, the protruding length of the tip of the perforating needle is 6-8mm, and the running speed of the roller with the needle is 40-60m/min.
Preferably, the thickness ratio of the bonding layer, the middle layer and the heat sealing layer is 3:4:3, wherein the thickness of the bonding layer is 9-18 mu m, the thickness of the middle layer is 12-24 mu m, and the thickness of the heat sealing layer is 9-18 mu m.
Preferably, the attaching layer is composed of modified ethylene-vinyl acetate copolymer resin, namely modified EVA resin, and the middle layer is composed of high-density polyethylene resin and low-density polyethylene resin according to the mass ratio of 75:25; the heat sealing layer consists of low-density polyethylene resin, metallocene polyethylene resin, smooth master batch, opening master batch and processing aid according to the mass ratio of 75:25:1.5:1:0.2.
Preferably, the modified EVA resin is named as Japanese eastern L-3388, the high-density polyethylene resin is named as Exxon Mobil HTA108, the low-density polyethylene resin is named as Exxon Mobil LD150BW, the metallocene polyethylene resin is named as Dow chemical PL1881, the smooth master batch is named as mounting color 10090-K, the opening master batch is named as Beijing Asian AB-20LD, and the processing aid is named as mounting color 100991-K.
In order to solve the technical problem of the invention, another technical scheme adopted is that the paper-plastic composite packaging material with high air permeability is prepared by the preparation method of any one of the above.
Compared with the prior art, the invention has the beneficial effects that:
1) According to the invention, the formula of the modified polyethylene PE film is optimized according to the selection of particles, the design of the formula and the optimization of the process, the PE film is subjected to microporous treatment through a film blowing process, and the paper-plastic packaging materials are compounded in a heat bonding compounding mode, so that the PE film material with stable and excellent high air permeability is finally obtained, and the PE film material is applied from daily life product packaging to the fields of medical science, clothing industry, electrical elements and the like, and meets the specific requirements of the customer market.
2) The invention creatively adopts a thermal bonding mode to compound the paper-plastic packaging materials, avoids dry glue application or extrusion coating to block micropores on the modified polyethylene PE film, and improves the air permeability of the film.
3) In the raw materials, the modified EVA resin of the bonding layer is selected from L-3388 of the east China, has excellent processability and low-temperature bonding performance, and is suitable for the technological requirements of the hot-pressing compounding;
the high-density polyethylene resin of the middle layer is selected from Exxon Mobil HTA108, so that the stiffness of the rolled film can be improved, and the overall heat resistance of the film can be improved; the low-density polyethylene resin is selected from Exxon Mobil LD150BW, has excellent processability, and can enable the film blowing process of the film to be more stable;
the metallocene polyethylene resin of the heat-sealing layer adopts the Dow chemical PL1881, the melting point is low, the heat-sealing temperature of the rolled film can be reduced, meanwhile, the heat-bonding strength and the heat-sealing strength of the rolled film can be improved, the stability of the friction coefficient can be effectively controlled by adding a proper amount of silicone, and meanwhile, the production control can be more stable by adding the processing aid of the color 100991-K.
Detailed Description
The present invention will be further described in detail with reference to the following examples, in order to make the objects, technical solutions and advantages of the present invention more apparent, and all other examples obtained by those skilled in the art without making any inventive effort are within the scope of the present invention based on the examples in the present invention.
In the following examples, the modified EVA resin was designated as L-3388 manufactured by Toyo of Japan; the high-density polyethylene resin has the brand name HTA108 manufactured by ExxonMobil company; the brand of the low-density polyethylene resin is LD150BW manufactured by Exxonmobil company; the brand of the metallocene polyethylene resin is PL1881 manufactured by the Dow chemical company; the smooth master batch is 10090-K produced by brand-name color matching company; the opening master batch is AB-20LD manufactured by Beijing Alen company; the processing aid is 100991-K manufactured by America color company. The extrusion temperature of the extruder is set to be 150-165 ℃ for heating the first area, 165-175 ℃ for heating the second area, 175-185 ℃ for heating the third area, 165-175 ℃ for heating the machine head, 170-185 ℃ for the lip die and 170-185 ℃ for the die.
Example 1
S1, weighing raw materials of the corresponding weight components according to the formula composition of a film laminating layer, an intermediate layer and a heat sealing layer, wherein the laminating layer consists of 100 parts by mass of modified EVA resin, and the intermediate layer consists of 75 parts by mass of high-density polyethylene resin and 25 parts by mass of low-density polyethylene resin; the heat-sealing layer consists of 75 parts by mass of low-density polyethylene resin, 25 parts by mass of metallocene polyethylene resin, 1.5 parts by mass of smooth master batch, 1 part by mass of open master batch and 0.2 part by mass of processing aid, and the materials are respectively added into three charging barrels of W & H film blowing equipment;
mixing and melting the raw materials in the three charging barrels to form a tube blank, stretching the tube blank, flushing out the tube blank from the center of a die head of an extruder, compressing air to enable the tube blank to be inflated into film bubbles, cooling and shaping the film bubbles through an air ring to obtain a polyethylene film, carrying out corona treatment on the shaped film at a corona layer surface of the shaped film, and setting the corona treatment power to be 7.5KW to obtain a modified polyethylene film;
s2, carrying out pin roller treatment on the modified polyethylene film by adopting a pin roller pair, and forming innumerable penetrating pinholes on the surface of the modified polyethylene film;
s3, carrying out heat lamination and compounding on the microporous polyethylene film and paper, wherein the heat lamination temperature is 160 ℃, the lamination press roll pressure value is 0.8MPa, and the production speed is 50m/min, so that the paper-plastic composite packaging material with high air permeability is prepared.
Example 2
S1, weighing raw materials of the corresponding weight components according to the formula composition of a film laminating layer, an intermediate layer and a heat sealing layer, wherein the laminating layer consists of 95 parts by mass of modified EVA resin, and the intermediate layer consists of 75 parts by mass of high-density polyethylene resin and 25 parts by mass of low-density polyethylene resin; the heat-sealing layer consists of 80 parts by mass of low-density polyethylene resin, 25 parts by mass of metallocene polyethylene resin, 1.5 parts by mass of smooth master batch, 1 part by mass of open master batch and 0.2 part by mass of processing aid, and the materials are respectively added into three charging barrels of W & H film blowing equipment;
mixing and melting the raw materials in the three charging barrels to form a tube blank, stretching the tube blank, flushing out the tube blank from the center of a die head of an extruder, compressing air to enable the tube blank to be inflated into film bubbles, cooling and shaping the film bubbles through an air ring to obtain a polyethylene film, carrying out corona treatment on the shaped film at a corona layer surface of the shaped film, and setting the corona treatment power to be 7.5KW to obtain a modified polyethylene film;
s2, carrying out pin roller treatment on the modified polyethylene film by adopting a pin roller pair, and forming innumerable penetrating pinholes on the surface of the modified polyethylene film;
s3, carrying out heat lamination and compounding on the microporous polyethylene film and paper, wherein the heat lamination temperature is 160 ℃, the lamination press roll pressure value is 0.8MPa, and the production speed is 50m/min, so that the paper-plastic composite packaging material with high air permeability is prepared.
Example 3
S1, weighing raw materials of the corresponding weight components according to the formula composition of a film laminating layer, an intermediate layer and a heat sealing layer, wherein the laminating layer consists of 90 parts by mass of modified EVA resin, and the intermediate layer consists of 75 parts by mass of high-density polyethylene resin and 25 parts by mass of low-density polyethylene resin; the heat-sealing layer consists of 85 parts by mass of low-density polyethylene resin, 25 parts by mass of metallocene polyethylene resin, 1.5 parts by mass of smooth master batch, 1 part by mass of open master batch and 0.2 part by mass of processing aid, and the materials are respectively added into three charging barrels of W & H film blowing equipment;
mixing and melting the raw materials in the three charging barrels to form a tube blank, stretching the tube blank, flushing out the tube blank from the center of a die head of an extruder, compressing air to enable the tube blank to be inflated into film bubbles, cooling and shaping the film bubbles through an air ring to obtain a polyethylene film, carrying out corona treatment on the shaped film at a corona layer surface of the shaped film, and setting the corona treatment power to be 7.5KW to obtain a modified polyethylene film;
s2, carrying out pin roller treatment on the modified polyethylene film by adopting a pin roller pair, and forming innumerable penetrating pinholes on the surface of the modified polyethylene film;
s3, carrying out heat lamination and compounding on the microporous polyethylene film and paper, wherein the heat lamination temperature is 160 ℃, the lamination press roll pressure value is 0.8MPa, and the production speed is 50m/min, so that the paper-plastic composite packaging material with high air permeability is prepared.
Comparative example 1
S1, weighing raw materials of the corresponding weight components according to the formula composition of a film laminating layer, an intermediate layer and a heat sealing layer, wherein the laminating layer consists of 100 parts by mass of modified EVA resin, and the intermediate layer consists of 75 parts by mass of high-density polyethylene resin and 25 parts by mass of low-density polyethylene resin; the heat-sealing layer consists of 75 parts by mass of low-density polyethylene resin, 25 parts by mass of metallocene polyethylene resin, 1.5 parts by mass of smooth master batch, 1 part by mass of open master batch and 0.2 part by mass of processing aid, and the materials are respectively added into three charging barrels of W & H film blowing equipment;
mixing and melting the raw materials in the three charging barrels to form a tube blank, stretching the tube blank, flushing out the tube blank from the center of a die head of an extruder, compressing air to enable the tube blank to be inflated into film bubbles, cooling and shaping the film bubbles through an air ring to obtain a polyethylene film, carrying out corona treatment on the shaped film at a corona layer surface of the shaped film, and setting the corona treatment power to be 7.5KW to obtain a modified polyethylene film;
s2, carrying out pin roller treatment on the modified polyethylene film by adopting a pin roller pair, and forming innumerable penetrating pinholes on the surface of the modified polyethylene film;
s3, compounding the microporous polyethylene film with paper, wherein extrusion compounding is adopted, the number of extrusion compounded polyethylene granules is Cook chemistry 722, and the extrusion thickness is 15 mu m, so that the paper-plastic composite packaging material is prepared as a comparative example.
The paper-plastic composite packaging materials prepared in examples 1 to 3 and comparative example were subjected to performance test, and the results are shown in the following table 1:
table 1 test of the properties of the paper-plastic composite packaging materials obtained in examples 1 to 3 and comparative example 1
From the test results in table 1, it can be seen that: the water vapor transmittance data of the packaging material prepared by the preparation method of the paper-plastic composite packaging material with high air permeability is far higher than that of the paper-plastic composite packaging material produced by adopting an extrusion composite process in the existing comparative example, and the paper-plastic composite packaging material has excellent high air permeability.
The paper-plastic composite packaging material with high air permeability, which is prepared by the technical scheme, has slightly lower breaking force and elongation at break than those of the comparative example 1, because the extrusion compounding process is adopted in the comparative example 1, the thickness of an extrusion film is increased by 15 mu m, and the thickness of the corresponding composite packaging material is also increased by 15 mu m. So that the data of the breaking force and the breaking elongation are also increased by a little. The peeling force, friction coefficient and heat seal strength are almost the same as those of comparative example 1, so that the paper-plastic composite packaging material prepared by the application has the performance characteristics of the traditional paper-plastic packaging material, also has excellent high air permeability, and can meet the specific requirements of customer markets in the fields of daily life product packaging to medicine, clothing industry, electrical elements and the like.
Those skilled in the art will appreciate that the foregoing is merely a few, but not all, embodiments of the invention. It should be noted that many variations and modifications can be made by those skilled in the art, and all variations and modifications which do not depart from the scope of the invention as defined in the appended claims are intended to be protected.

Claims (6)

1. The preparation method of the paper-plastic composite packaging material with high air permeability is characterized by comprising the following steps of:
s1, weighing raw materials of corresponding weight components according to the formula composition of a film laminating layer, an intermediate layer and a heat sealing layer, respectively adding the raw materials into three charging barrels of W & H film blowing equipment, mixing and melting the raw materials in the charging barrels to form a tube blank, extruding and expanding the tube blank through a die head of an extruder to form a film bubble, and cooling and shaping the film bubble through an air ring to prepare the polyethylene film;
the thickness ratio of the bonding layer to the intermediate layer to the heat sealing layer is 3:4:3, wherein the thickness of the bonding layer is 9-18 mu m, the thickness of the intermediate layer is 12-24 mu m, and the thickness of the heat sealing layer is 9-18 mu m;
the laminating layer consists of modified ethylene-vinyl acetate copolymer resin, namely modified EVA resin, and the middle layer consists of high-density polyethylene resin and low-density polyethylene resin according to the mass ratio of 75:25; the heat sealing layer consists of low-density polyethylene resin, metallocene polyethylene resin, smooth master batch, opening master batch and processing aid according to the mass ratio of 75:25:1.5:1:0.2;
the modified EVA resin is characterized in that the brand of the modified EVA resin is Japanese Toyo L-3388, the brand of the high-density polyethylene resin is Exxon Mobil HTA108, the brand of the low-density polyethylene resin is Exxon Mobil LD150BW, the brand of the metallocene polyethylene resin is Dow chemical PL1881, the brand of the smooth master batch is an installation color 10090-K, the brand of the open master batch is Beijing Asian AB-20LD, and the brand of the processing aid is an installation color 100991-K;
s2, carrying out corona treatment on the surface of the shaped polyethylene film corona layer, wherein the power of the corona treatment is 7.5KW, so as to obtain a modified polyethylene film;
s3, treating the modified polyethylene film by adopting a punching roller set pair, and forming innumerable penetrating pinholes on the surface of the modified polyethylene film; the punching roller set comprises a roller with needles and a pressing roller which are matched for use, and the density of punching needles on the outer surface of the roller with the needles is 5 multiplied by 5/mm 2 The diameter of the tip of the perforating needle is 0.5mm, and the protruding length of the tip of the perforating needle is 6-8mm;
s4, carrying out heat lamination and compounding on the surface of the lamination layer in the microporous polyethylene film and paper, wherein the heat lamination temperature is 150-170 ℃, the lamination press roll pressure value is 0.7-0.9MPa, and the production speed is 45-55m/min, so that the paper-plastic composite packaging material with high air permeability is prepared.
2. The method for preparing the paper-plastic composite packaging material with high air permeability according to claim 1, wherein the temperature of the three charging barrels corresponding to the barrel of the extruder in the step S1 is 150-165 ℃ in a first heating area, 165-175 ℃ in a second heating area, 175-185 ℃ in a third heating area, 165-175 ℃ in a machine head, 170-185 ℃ in a lip die and 170-185 ℃ in a mouth die.
3. The method for preparing the high-air-permeability paper-plastic composite packaging material according to claim 1, wherein the hole punching roller set in the step S3 comprises a pin roller and a press roller which are matched, the center of the pin roller is provided with a roller shaft along the axial direction of the pin roller, the outer surface of the roller shaft is uniformly provided with punching pins, a modified polyethylene film enters a gap between the pin roller and the press roller through a guide roller, and innumerable penetrating pinholes are formed on the surface of the modified polyethylene film through the mutual engagement of the pin roller and the press roller at the temperature of 330-350 ℃.
4. The method for producing a high air permeability paper-plastic composite packing material according to claim 3, wherein the pin roller is a felt roller or a nylon roller.
5. The method for producing a high air permeability paper plastic composite packaging material according to claim 3, wherein the running speed of the pin roller in step S3 is 40-60m/min.
6. A high air permeability paper-plastic composite packaging material produced by the production method of any one of claims 1 to 5.
CN202110642728.4A 2021-06-09 2021-06-09 Paper-plastic composite packaging material with high air permeability and preparation method thereof Active CN113524832B (en)

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CN101260633A (en) * 2008-01-04 2008-09-10 东莞市广益食品添加剂实业有限公司 Alcohol antistaling agent wrapper paper and method for making same
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CN102848617A (en) * 2012-10-11 2013-01-02 王周 Composite ventilating film with multilayered structure as well as production method and application thereof
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