CN112406238A - Green environment-friendly cold-stretched film and preparation method thereof - Google Patents

Green environment-friendly cold-stretched film and preparation method thereof Download PDF

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CN112406238A
CN112406238A CN202011385256.0A CN202011385256A CN112406238A CN 112406238 A CN112406238 A CN 112406238A CN 202011385256 A CN202011385256 A CN 202011385256A CN 112406238 A CN112406238 A CN 112406238A
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parts
weight
density polyethylene
film
polyethylene
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李忠
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Kunshan Jinmeng Plastic Film Co ltd
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Kunshan Jinmeng Plastic Film Co ltd
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    • B32B27/00—Layered products comprising a layer of synthetic resin
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    • 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
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    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/54—Yield strength; Tensile strength
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
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    • 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
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    • B32B2307/5825—Tear resistant
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    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
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    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
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Abstract

The invention is suitable for the technical field of films, and provides a green environment-friendly cold-stretched film and a preparation method thereof, wherein the green environment-friendly cold-stretched film comprises an inner layer and an outer layer, wherein the inner layer accounts for 60-80% of the weight of the film, and the outer layer accounts for 20-40% of the weight of the film; the inner layer is composed of the following substances in parts by weight: 9-15 parts of cyclopentene, 2-7 parts of polyethylene glycol, 17-22 parts of polyethylene, 2-6 parts of vinyl acetate and 3-8 parts of glycerol butyrate; the outer layer consists of the following substances in parts by weight: 16-24 parts of low-density polyethylene, 2-7 parts of high-density polyethylene, 1.5-2.4 parts of toluene diisocyanate, 0.1-0.4 part of polybutadiene, 0.3-0.6 part of plasticizer and 0.7-1.2 parts of modified polyisobutylene. The cold-stretched film comprises two layers made of different materials, and the ratio of the materials of each layer is adjusted, so that the prepared cold-stretched film has high tensile strength and is not easy to deform when used at high temperature; the preparation method is simple in steps, and the prepared cold-stretched film is not easy to adhere in use and is suitable for popularization.

Description

Green environment-friendly cold-stretched film and preparation method thereof
Technical Field
The invention belongs to the technical field of films, and particularly relates to a green environment-friendly cold-stretched film and a preparation method thereof.
Background
The PE stretch film (also called as a winding film) has higher tensile strength and tearing strength and good self-adhesion, so that objects can be wrapped into a whole to prevent the objects from scattering and collapsing during transportation. The film has excellent transparency, is attractive and elegant for wrapping objects, can prevent the objects from being water, dust and damage, and is widely used for packaging goods trays, such as wrapping packages in industries of electronics, building materials, chemical engineering, metal products, automobile accessories, wires and cables, daily necessities, food, paper making and the like. Most PEs are used for blown film processing films, either general purpose Low Density PE (LDPE) or Linear Low Density PE (LLDPE) are available. HDPE film grades are typically used where superior stretchability and excellent barrier properties are required.
However, the strength of the existing cold-stretched film needs to be further improved, the thermal stability is not good enough, and the film is easy to deform when used at high temperature.
Disclosure of Invention
The invention provides a green environment-friendly cold-stretched film and a preparation method thereof, and aims to solve the problems that the strength of the existing cold-stretched film in the background art needs to be further improved, the thermal stability is poor, and the film is easy to deform when being used at high temperature.
The invention is realized in such a way, the green environment-friendly cold-stretched film comprises an inner layer and an outer layer, wherein the inner layer accounts for 60-80% of the weight of the film, and the outer layer accounts for 20-40% of the weight of the film;
the inner layer is composed of the following substances in parts by weight: 9-15 parts of cyclopentene, 2-7 parts of polyethylene glycol, 17-22 parts of polyethylene, 2-6 parts of vinyl acetate and 3-8 parts of glycerol butyrate;
the outer layer consists of the following substances in parts by weight: 16-24 parts of low-density polyethylene, 2-7 parts of high-density polyethylene, 1.5-2.4 parts of toluene diisocyanate, 0.1-0.4 part of polybutadiene, 0.3-0.6 part of plasticizer and 0.7-1.2 parts of modified polyisobutylene, wherein the melt index of the low-density polyethylene is 4g/10min, and the density is 0.925g/cm3The melt index of the high-density polyethylene is 8g/10min, and the density is 1.865g/cm3。
Preferably, the inner layer comprises 70% by weight of the film and the outer layer comprises 30% by weight of the film.
Preferably, the inner layer consists of the following substances in parts by weight: 10-12 parts of cyclopentene, 4-6 parts of polyethylene glycol, 18-20 parts of polyethylene, 3-5 parts of vinyl acetate and 4-6 parts of glycerol butyrate.
Preferably, the outer layer consists of the following substances in parts by weight: 18-20 parts of low-density polyethylene, 4-6 parts of high-density polyethylene, 1.8-2.0 parts of toluene diisocyanate, 0.2-0.4 part of polybutadiene, 0.4-0.6 part of plasticizer and 0.8-1.0 part of modified polyisobutylene, wherein the melt index of the low-density polyethylene is 4g/10min, and the density is 0.925g/cm3The melt index of the high-density polyethylene is 8g/10min, and the density is 1.865g/cm3。
A preparation method of a green environment-friendly cold-stretched film comprises the following steps:
s1, setting the reaction temperature at 85-90 ℃, weighing corresponding parts of cyclopentene, polyethylene glycol, polyethylene, vinyl acetate and glycerol butyrate according to the parts by weight, mixing, fully stirring uniformly, and keeping the temperature at 85-90 ℃ for 25-30 minutes to prepare an inner layer mixing preparation raw material;
s2, raising the reaction temperature to 95-100 ℃, weighing corresponding parts of low-density polyethylene, high-density polyethylene, toluene diisocyanate, polybutadiene, plasticizer and modified polyisobutylene according to parts by weight, mixing, fully stirring uniformly, and preserving heat at 95-100 ℃ for 35-45 minutes to prepare an outer layer mixing preparation raw material;
s3, mixing the inner layer mixed preparation raw material obtained in the S1 and the outer layer mixed preparation raw material obtained in the S2 according to the mixture ratio;
s4, co-extruding and blow molding the film material prepared in the S3 to obtain the cold stretching film.
Preferably, in S1, the reaction temperature is set at 85 ℃, the cyclopentene, the polyethylene glycol, the polyethylene, the vinyl acetate and the glycerol butyrate are weighed according to the parts by weight, the materials are fully and uniformly stirred after being mixed, and the temperature is kept at 85 ℃ for 25 minutes, so that the inner layer mixed preparation raw material is prepared.
Preferably, in S2, the reaction temperature is raised to 95 ℃, the corresponding parts of low-density polyethylene, high-density polyethylene, toluene diisocyanate, polybutadiene, plasticizer and modified polyisobutylene are weighed according to the parts by weight, fully and uniformly stirred after mixing, and the temperature is kept at 95 ℃ for 35 minutes to prepare the outer layer mixed preparation raw material.
Compared with the prior art, the invention has the beneficial effects that: the cold-stretched film comprises two layers made of different materials, and the ratio of the materials of each layer is adjusted, so that the prepared cold-stretched film has high tensile strength and is not easy to deform when used at high temperature; the low-density polyethylene and the high-density polyethylene are blended to be used as raw materials, so that the tear strength of the cold-stretched film can be improved, the toughness, the environmental stress cracking resistance and the flexibility of the cold-stretched film are improved, the tensile strength of the prepared cold-stretched film is more than 100MPa, and the shrinkage temperature is more than 200 ℃. The preparation method of the cold-stretched film has simple steps, and the prepared cold-stretched film is not easy to adhere in use and is suitable for popularization.
Drawings
FIG. 1 is a schematic flow chart of the preparation method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a technical scheme that: the green environment-friendly cold-stretched film comprises an inner layer and an outer layer, wherein the inner layer accounts for 60-80% of the weight of the film, and the outer layer accounts for 20-40% of the weight of the film;
the inner layer consists of the following substances in parts by weight: 9-15 parts of cyclopentene, 2-7 parts of polyethylene glycol, 17-22 parts of polyethylene, 2-6 parts of vinyl acetate and 3-8 parts of glycerol butyrate;
the outer layer consists of the following substances in parts by weight: 16-24 parts of low-density polyethylene, 2-7 parts of high-density polyethylene, 1.5-2.4 parts of toluene diisocyanate, 0.1-0.4 part of polybutadiene, 0.3-0.6 part of plasticizer and 0.7-1.2 parts of modified polyisobutylene, wherein the melt index of the low-density polyethylene is 4g/10min, and the density is 0.925g/cm3The melt index of the high-density polyethylene is 8g/10min, and the density is 1.865g/cm3。
In the present invention, it is preferable that the inner layer accounts for 70% by weight of the film and the outer layer accounts for 30% by weight of the film.
In the present invention, it is preferable that the inner layer is composed of the following materials in parts by weight: 10-12 parts of cyclopentene, 4-6 parts of polyethylene glycol, 18-20 parts of polyethylene, 3-5 parts of vinyl acetate and 4-6 parts of glycerol butyrate. More preferably, the inner layer consists of the following substances in parts by weight: 11 parts of cyclopentene, 5 parts of polyethylene glycol, 19 parts of polyethylene, 4 parts of vinyl acetate and 5 parts of glycerol butyrate.
In the present invention, it is preferable that the outer layer is composed of the following materials in parts by weight: 18-20 parts of low-density polyethylene, 4-6 parts of high-density polyethylene, 1.8-2.0 parts of toluene diisocyanate, 0.2-0.4 part of polybutadiene, 0.4-0.6 part of plasticizer and 0.8-1.0 part of modified polyisobutylene, wherein the melt index of the low-density polyethylene is 4g/10min, and the density is 0.925g/cm3The melt index of the high-density polyethylene is 8g/10min, and the density is 1.865g/cm3. More preferably, the outer layer consists of the following substances in parts by weight: 19 parts of low-density polyethylene, 5 parts of high-density polyethylene, 2.0 parts of toluene diisocyanate, 0.3 part of polybutadiene, 0.5 part of plasticizer and 0.9 part of modified polyisobutylene.
Referring to fig. 1, a method for preparing a green environment-friendly cold-stretched film includes the following steps:
s1, setting the reaction temperature at 85-90 ℃, weighing corresponding parts of cyclopentene, polyethylene glycol, polyethylene, vinyl acetate and glycerol butyrate according to the parts by weight, mixing, fully stirring uniformly, and keeping the temperature at 85-90 ℃ for 25-30 minutes to prepare an inner layer mixing preparation raw material;
s2, raising the reaction temperature to 95-100 ℃, weighing corresponding parts of low-density polyethylene, high-density polyethylene, toluene diisocyanate, polybutadiene, plasticizer and modified polyisobutylene according to parts by weight, mixing, fully stirring uniformly, and preserving heat at 95-100 ℃ for 35-45 minutes to prepare an outer layer mixing preparation raw material;
s3, mixing the inner layer mixed preparation raw material obtained in the S1 and the outer layer mixed preparation raw material obtained in the S2 according to the mixture ratio;
s4, co-extruding and blow molding the film material prepared in the S3 to obtain the cold stretching film.
In the present invention, preferably in S1, the reaction temperature is set at 85 ℃, the corresponding parts of cyclopentene, polyethylene glycol, polyethylene, vinyl acetate and glycerol butyrate are weighed according to the parts by weight, mixed, stirred uniformly and kept at 85 ℃ for 25 minutes, and the inner layer mixed preparation raw material is prepared.
In the present invention, it is preferable that in S2, the reaction temperature is raised to 95 ℃, and the respective parts of the low density polyethylene, the high density polyethylene, the toluene diisocyanate, the polybutadiene, the plasticizer and the modified polyisobutylene are weighed according to the parts by weight, and after mixing, the mixture is sufficiently stirred uniformly and kept warm at 95 ℃ for 35 minutes to prepare the outer layer mixing preparation raw material.
For further illustration of the present invention, the following examples are provided to describe the green environmental-friendly cold-stretched film and the preparation method thereof in detail, but the scope of the present invention should not be construed as being limited thereto.
Example 1
The green environment-friendly cold-stretched film comprises an inner layer and an outer layer, wherein the inner layer accounts for 60% of the weight of the film, and the outer layer accounts for 20% of the weight of the film;
the inner layer is composed of the following substances in parts by weight: 9 parts of cyclopentene, 2 parts of polyethylene glycol, 17 parts of polyethylene, 2 parts of vinyl acetate and 3 parts of glycerol butyrate;
the outer layer consists of the following substances in parts by weight: 16 parts of low-density polyethylene, 2 parts of high-density polyethylene, 1.5 parts of toluene diisocyanate, 0.1 part of polybutadiene, 0.3 part of plasticizer and 0.7 part of modified polyisobutylene, wherein the melt index of the low-density polyethylene is 4g/10min, and the density is 0.925g/cm3The melt index of the high-density polyethylene is 8g/10min, and the density is 1.865g/cm3。
A preparation method of a green environment-friendly cold-stretched film comprises the following steps:
s1, setting the reaction temperature at 85 ℃, weighing corresponding parts of cyclopentene, polyethylene glycol, polyethylene, vinyl acetate and glyceryl butyrate according to the parts by weight, mixing, fully stirring uniformly, and keeping the temperature at 85 ℃ for 25 minutes to prepare an inner layer mixing preparation raw material;
s2, raising the reaction temperature to 95 ℃, weighing corresponding parts of low-density polyethylene, high-density polyethylene, toluene diisocyanate, polybutadiene, plasticizer and modified polyisobutylene according to the parts by weight, mixing, fully stirring uniformly, and keeping the temperature at 95 ℃ for 35 minutes to prepare an outer layer mixed preparation raw material;
s3, mixing the inner layer mixed preparation raw material obtained in the S1 and the outer layer mixed preparation raw material obtained in the S2 according to the mixture ratio;
s4, co-extruding and blow molding the film material prepared in the S3 to obtain the cold stretching film.
Example 2
The green environment-friendly cold-stretched film comprises an inner layer and an outer layer, wherein the inner layer accounts for 70% of the weight of the film, and the outer layer accounts for 30% of the weight of the film;
the inner layer is composed of the following substances in parts by weight: 12 parts of cyclopentene, 4 parts of polyethylene glycol, 19 parts of polyethylene, 4 parts of vinyl acetate and 6 parts of glycerol butyrate;
the outer layer consists of the following substances in parts by weight: 20 parts of low-density polyethylene, 5 parts of high-density polyethylene, 2.0 parts of toluene diisocyanate, 0.25 part of polybutadiene, 0.45 part of plasticizer and 0.9 part of modified polyisobutylene, wherein the melt index of the low-density polyethylene is 4g/10min, and the density is 0.925g/cm3The melt index of the high-density polyethylene is 8g/10min, and the density is 1.865g/cm3。
A preparation method of a green environment-friendly cold-stretched film comprises the following steps:
s1, setting the reaction temperature at 88 ℃, weighing corresponding parts of cyclopentene, polyethylene glycol, polyethylene, vinyl acetate and glyceryl butyrate according to the parts by weight, mixing, fully stirring uniformly, and keeping the temperature at 88 ℃ for 28 minutes to prepare an inner layer mixing preparation raw material;
s2, raising the reaction temperature to 98 ℃, weighing corresponding parts of low-density polyethylene, high-density polyethylene, toluene diisocyanate, polybutadiene, plasticizer and modified polyisobutylene according to the parts by weight, mixing, fully stirring uniformly, and preserving heat at 98 ℃ for 40 minutes to prepare an outer layer mixed preparation raw material;
s3, mixing the inner layer mixed preparation raw material obtained in the S1 and the outer layer mixed preparation raw material obtained in the S2 according to the mixture ratio;
s4, co-extruding and blow molding the film material prepared in the S3 to obtain the cold stretching film.
Example 3
The green environment-friendly cold-stretched film comprises an inner layer and an outer layer, wherein the inner layer accounts for 80% of the weight of the film, and the outer layer accounts for 20% of the weight of the film;
the inner layer is composed of the following substances in parts by weight: 15 parts of cyclopentene, 7 parts of polyethylene glycol, 22 parts of polyethylene, 6 parts of vinyl acetate and 8 parts of glycerol butyrate;
the outer layer consists of the following substances in parts by weight: 24 parts of low-density polyethylene, 7 parts of high-density polyethylene, 2.4 parts of toluene diisocyanate, 0.4 part of polybutadiene, 0.6 part of plasticizer and 1.2 parts of modified polyisobutylene, wherein the low-density polyethylene is prepared from the following raw materials in parts by weightThe melt index of (A) is 4g/10min, and the density is 0.925g/cm3The melt index of the high-density polyethylene is 8g/10min, and the density is 1.865g/cm3。
A preparation method of a green environment-friendly cold-stretched film comprises the following steps:
s1, setting the reaction temperature at 90 ℃, weighing corresponding parts of cyclopentene, polyethylene glycol, polyethylene, vinyl acetate and glyceryl butyrate according to the parts by weight, mixing, fully stirring uniformly, and keeping the temperature at 90 ℃ for 30 minutes to prepare an inner layer mixing preparation raw material;
s2, raising the reaction temperature to 100 ℃, weighing corresponding parts of low-density polyethylene, high-density polyethylene, toluene diisocyanate, polybutadiene, plasticizer and modified polyisobutylene according to the parts by weight, mixing, fully stirring uniformly, and keeping the temperature at 100 ℃ for 45 minutes to prepare an outer layer mixing preparation raw material;
s3, mixing the inner layer mixed preparation raw material obtained in the S1 and the outer layer mixed preparation raw material obtained in the S2 according to the mixture ratio;
s4, co-extruding and blow molding the film material prepared in the S3 to obtain the cold stretching film.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (7)

1. The green environment-friendly cold-stretched film is characterized by comprising an inner layer and an outer layer, wherein the inner layer accounts for 60-80% of the weight of the film, and the outer layer accounts for 20-40% of the weight of the film;
the inner layer is composed of the following substances in parts by weight: 9-15 parts of cyclopentene, 2-7 parts of polyethylene glycol, 17-22 parts of polyethylene, 2-6 parts of vinyl acetate and 3-8 parts of glycerol butyrate;
the outer layer consists of the following substances in parts by weight: 16-24 parts of low-density polyethylene, 2-7 parts of high-density polyethylene, 1.5-2.4 parts of toluene diisocyanate, 0.1-0.4 part of polybutadiene, 0.3-0.6 part of plasticizer and modified0.7-1.2 parts of polyisobutylene, wherein the melt index of the low-density polyethylene is 4g/10min, and the density is 0.925g/cm3The melt index of the high-density polyethylene is 8g/10min, and the density is 1.865g/cm3。
2. The green environment-friendly cold-stretched film according to claim 1, wherein the inner layer accounts for 70% of the weight of the film, and the outer layer accounts for 30% of the weight of the film.
3. The green environment-friendly cold-stretched film as claimed in claim 1, wherein the inner layer is composed of the following substances in parts by weight: 10-12 parts of cyclopentene, 4-6 parts of polyethylene glycol, 18-20 parts of polyethylene, 3-5 parts of vinyl acetate and 4-6 parts of glycerol butyrate.
4. The green environment-friendly cold-stretched film as claimed in claim 1, wherein the outer layer is composed of the following substances in parts by weight: 18-20 parts of low-density polyethylene, 4-6 parts of high-density polyethylene, 1.8-2.0 parts of toluene diisocyanate, 0.2-0.4 part of polybutadiene, 0.4-0.6 part of plasticizer and 0.8-1.0 part of modified polyisobutylene, wherein the melt index of the low-density polyethylene is 4g/10min, and the density is 0.925g/cm3The melt index of the high-density polyethylene is 8g/10min, and the density is 1.865g/cm3。
5. The preparation method of the green environment-friendly cold-stretched film is characterized by comprising the following steps of:
s1, setting the reaction temperature at 85-90 ℃, weighing corresponding parts of cyclopentene, polyethylene glycol, polyethylene, vinyl acetate and glycerol butyrate according to the parts by weight, mixing, fully stirring uniformly, and keeping the temperature at 85-90 ℃ for 25-30 minutes to prepare an inner layer mixing preparation raw material;
s2, raising the reaction temperature to 95-100 ℃, weighing corresponding parts of low-density polyethylene, high-density polyethylene, toluene diisocyanate, polybutadiene, plasticizer and modified polyisobutylene according to parts by weight, mixing, fully stirring uniformly, and preserving heat at 95-100 ℃ for 35-45 minutes to prepare an outer layer mixing preparation raw material;
s3, mixing the inner layer mixed preparation raw material obtained in the S1 and the outer layer mixed preparation raw material obtained in the S2 according to the mixture ratio;
s4, co-extruding and blow molding the film material prepared in the S3 to obtain the cold stretching film.
6. The method for preparing a green environment-friendly cold-drawn film as claimed in claim 5, wherein in S1, the reaction temperature is set at 85 ℃, the corresponding parts of cyclopentene, polyethylene glycol, polyethylene, vinyl acetate and glycerol butyrate are weighed according to the parts by weight, and the inner layer mixed preparation raw material is prepared by mixing, stirring uniformly and keeping the temperature at 85 ℃ for 25 minutes.
7. The method for preparing a green environment-friendly cold-drawn film as claimed in claim 5, wherein S2, the reaction temperature is raised to 95 ℃, the corresponding parts of low-density polyethylene, high-density polyethylene, toluene diisocyanate, polybutadiene, plasticizer and modified polyisobutylene are weighed according to the parts by weight, and the raw materials are prepared by mixing, fully stirring uniformly and preserving heat at 95 ℃ for 35 minutes to obtain the outer layer mixed preparation raw material.
CN202011385256.0A 2020-12-01 2020-12-01 Green environment-friendly cold-stretched film and preparation method thereof Pending CN112406238A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104151507A (en) * 2014-08-18 2014-11-19 苏州市盛百威包装设备有限公司 Tensile winding membrane material and preparation method thereof
CN108314820A (en) * 2018-02-08 2018-07-24 青岛软盛塑业有限公司 Stretched film and preparation method thereof
CN109094163A (en) * 2018-10-29 2018-12-28 昆山金盟塑料薄膜有限公司 A kind of high intensity cold stretched film and preparation method thereof
CN110154477A (en) * 2019-06-11 2019-08-23 福建富一锦科技有限公司 A kind of PE bag in box film and preparation method thereof
CN110722855A (en) * 2019-09-26 2020-01-24 深圳市双源包装材料有限公司 High-tensile transparent stretch film

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104151507A (en) * 2014-08-18 2014-11-19 苏州市盛百威包装设备有限公司 Tensile winding membrane material and preparation method thereof
CN108314820A (en) * 2018-02-08 2018-07-24 青岛软盛塑业有限公司 Stretched film and preparation method thereof
CN109094163A (en) * 2018-10-29 2018-12-28 昆山金盟塑料薄膜有限公司 A kind of high intensity cold stretched film and preparation method thereof
CN110154477A (en) * 2019-06-11 2019-08-23 福建富一锦科技有限公司 A kind of PE bag in box film and preparation method thereof
CN110722855A (en) * 2019-09-26 2020-01-24 深圳市双源包装材料有限公司 High-tensile transparent stretch film

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Application publication date: 20210226