CN114851662A - Linear easily-torn PE film and preparation process thereof - Google Patents

Linear easily-torn PE film and preparation process thereof Download PDF

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Publication number
CN114851662A
CN114851662A CN202210506376.4A CN202210506376A CN114851662A CN 114851662 A CN114851662 A CN 114851662A CN 202210506376 A CN202210506376 A CN 202210506376A CN 114851662 A CN114851662 A CN 114851662A
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layer
base film
film
mixture
percent
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苏壮
盛金华
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Zhuhai Deshen Environmental Protection Packaging Co ltd
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Zhuhai Deshen Environmental Protection Packaging 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
    • 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
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/325—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polycycloolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—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
    • B32B2307/70—Other properties
    • B32B2307/712—Weather resistant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/02—Open containers
    • B32B2439/06—Bags, sacks, sachets
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

The invention discloses a linear easy-to-tear PE film and a preparation process thereof, the linear easy-to-tear PE film is prepared by blending polyethylene and cycloolefin copolymer (COC) with different physical properties, and performing coextrusion up-blowing air cooling on an inner layer, a middle layer and an outer layer, wherein the thickness of the inner layer accounts for 20-40% of the total thickness, and the inner layer comprises the following components in percentage by mass: cycloolefin copolymer (COC): 20% -40%, metallocene linear polyethylene: 6% -14%, low density polyethylene: 30% -50%, linear low density polyethylene: 10% -30%; the thickness of the middle layer accounts for 20-60% of the total thickness, and the middle layer comprises the following components in percentage by mass: cycloolefin copolymer (COC): 25% -45%, low density polyethylene: 55% -75%; the thickness of the outer layer accounts for 20-40% of the total thickness, and the outer layer comprises the following components in percentage by mass: cycloolefin copolymer (COC): 25% -45%, low density polyethylene: 35% -55%, linear low density polyethylene: 10 to 30 percent. After the blown three-layer co-extrusion PE film is torn at any point in the transverse direction and the longitudinal direction, the fracture is regular, the application range of the PE film is expanded, and the use convenience is enhanced.

Description

Linear easily-torn PE film and preparation process thereof
Technical Field
The invention relates to the technical field of PE films, in particular to a linear easy-to-tear PE film and a preparation process thereof.
Background
Polyethylene film, also called PE film, is a colorless, tasteless, odorless, translucent, nontoxic insulating material, is widely used as packaging bags, food bags, and various containers, and has excellent moisture resistance and low moisture permeability.
The PE film has a wide application range, can be used as a mask, a medicine bag and light packages, and is required to be easily torn off linearly when being used as a packaging bag, so that the PE film is easily torn off linearly, but the existing PE film can only be easily torn off linearly by a transverse plane basically, and the longitudinal plane is difficult to be easily torn off linearly. Therefore, the PE film which is easy to tear off and has a straight transverse surface and a straight longitudinal surface and the preparation process are provided.
Disclosure of Invention
The invention aims to overcome the existing defects and provide a linear easy-to-tear PE film and a preparation process thereof, wherein polyethylene and Cyclic Olefin Copolymer (COC) plastic particles with different physical properties are divided into an inner layer, a middle layer and an outer layer according to different temperature requirements, and a three-layer co-extrusion film blowing machine is used for blowing the plastic particles into a film, wherein the fracture of the blown three-layer co-extrusion PE film is linear and regular after the blown three-layer co-extrusion PE film is torn from any point in the transverse direction and the longitudinal direction, so that the problems in the background art can be effectively solved.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a PE film is easily torn to straight line, includes three-layer coextrusion layer, three-layer coextrusion layer comprises inlayer base film, middle level base film and outer base film, inlayer base film, middle level base film and outer base film are all made by polyethylene and Cyclic Olefin Copolymer (COC) plastic granules of different physical properties, and three-layer base film each component is as follows according to the mass percentage:
the thickness of the inner base film accounts for 20-40% of the total thickness, and the inner base film comprises the following components in percentage by mass:
cycloolefin copolymer (COC): 20 to 40 percent of the total weight of the mixture,
metallocene linear polyethylene: 6 to 14 percent of the total weight of the mixture,
low density polyethylene: 30 to 50 percent of the total weight of the mixture,
linear low density polyethylene: 10% -30%;
the thickness of the middle base film accounts for 20-60% of the total thickness, and the middle base film comprises the following components in percentage by mass:
cycloolefin copolymer (COC): 25 to 45 percent of the total weight of the mixture,
low density polyethylene: 55% -75%;
the thickness of the outer base film accounts for 20-40% of the total thickness, and the outer base film comprises the following components in percentage by mass:
cycloolefin copolymer (COC): 25 to 45 percent of the total weight of the mixture,
low density polyethylene: 35 to 55 percent of the total weight of the mixture,
linear low density polyethylene: 10% -30%;
the cycloolefin copolymer (COC) is a raw material 8007F for Japanese Baochi plastics production and has a density of 1.010kg/m 3 Physical compatibility means 1.3 g/10 min;
the metallocene linear polyethylene is metallocene catalytic polyethylene adopting octene as comonomer, is a raw material 8CMLLDPE 1327CA produced by Exxon chemistry, and has a melting point of 1.3 g/10 min and a melting point of 122 ℃;
the low-density polyethylene is raw material LDPE 2426K in petrochemical production of Zhonghai shell, the physical property melting is 4 g/10 min, and the melting point is 110-112 ℃;
the linear low-density polyethylene of the inner base film is LLDPE Q2018H which is a raw material produced by Katalr petrochemical industry, the physical melting index is 2 g/10 min, and the melting point is 110 ℃;
the linear low-density polyethylene of the outer-layer basal membrane is LLDPE7042 which is a raw material for famous petrochemical production, and the physical property melt index is 2 g/10 min, and the melt point is 110 ℃.
Further, the thickness of the inner base film accounts for 30% of the total thickness, the thickness of the middle base film accounts for 40% of the total thickness, and the thickness of the outer base film accounts for 30% of the total thickness.
Further, the inner base film comprises the following components in percentage by mass:
cycloolefin copolymer (COC): 30 percent of the total weight of the mixture,
metallocene linear polyethylene: 10 percent of the total weight of the mixture,
low density polyethylene: 40 percent of the total weight of the mixture,
linear low density polyethylene: 20 percent;
the middle-layer basement membrane comprises the following components in percentage by mass:
cycloolefin copolymer (COC): 35 percent of the total weight of the mixture,
low density polyethylene: 65 percent;
the outer-layer base film comprises the following components in percentage by mass:
cycloolefin copolymer (COC): 35 percent of the total weight of the mixture,
low density polyethylene: 45 percent of the total weight of the mixture,
linear low density polyethylene: 20 percent.
A preparation method of a linear PE film easy to tear comprises the following steps of:
1) parameter setting of three-layer co-extrusion film blowing machine
a) Selecting the temperature, wherein the temperature of an inner layer screw material cylinder of a three-layer co-extrusion film blowing machine is 175-180 ℃, the temperature of a middle layer screw material cylinder is 200-205 ℃, the temperature of an outer layer screw material cylinder is 180-185 ℃, and the temperature of a die head runner is 190-195 ℃;
b) selecting air cooling temperature, wherein the air cooling temperature is 13-18 ℃;
c) selecting a blow-up ratio, wherein the proportion range of the blow-up ratio is 1: 1.1-1: 1.2;
d) selecting a condensation line, wherein the condensation line is selected within the range of 200mm to 250 mm;
2) preparation of inner base film
Uniformly mixing the raw materials of the inner base film according to a preparation proportion, adding the mixture into an inner hopper of a three-layer co-extrusion film blowing machine, setting the temperature of a screw charging barrel to be 175-180 ℃, and extruding the mixture into the inner base film of the three-layer co-extrusion layer through a screw;
3) preparation of the middle base film
Uniformly mixing the raw materials of the middle-layer base film according to a preparation proportion, adding the mixture into a middle-layer hopper of a three-layer co-extrusion film blowing machine, setting the temperature of a screw charging barrel to be 200-205 ℃, and extruding the mixture into the middle-layer base film of the three-layer co-extrusion layer through a screw;
4) preparation of outer base film
Uniformly mixing the raw materials of the outer-layer base film according to a preparation proportion, setting the temperature of a screw charging barrel to be 180-185 ℃ by an outer-layer hopper, and extruding the mixture into the outer-layer base film of the three-layer co-extrusion layer by a screw;
5) the inner, middle and outer three layers of base films are extruded and blown from a screw rod through a die head of a three-layer co-extrusion film blowing machine to form a finished film, and the die head temperature of the three-layer co-extrusion film blowing machine is set to be 190-195 ℃.
Further, in the step 1), the air cooling temperature is 15 ℃, and the blow-up ratio is 1: 1.1.
Further, 2), the inner layer screw extruder performs extrusion operation at a screw cylinder temperature of 180 ℃.
Further, 3), the middle layer screw extruder carries out extrusion operation at the screw cylinder temperature of 200 ℃.
Further, 4), the outer layer screw extruder carries out extrusion operation at the screw cylinder temperature of 180 ℃.
Further, in 5), the die head of the three-layer co-extrusion film blowing machine carries out extrusion operation at the temperature of 190 ℃.
Compared with the prior art, the invention has the beneficial effects that: the linear easy-to-tear PE film and the preparation method have the following advantages:
1. according to the invention, a three-layer co-extrusion upward blowing method is adopted, aiming at the phenomenon that the existing polyethylene film can only be linearly torn on the transverse surface and is difficult to be linearly torn on the longitudinal surface, through multiple tests, polyethylene and Cyclic Olefin Copolymer (COC) plastic particles with different physical properties are selected to be matched according to different temperature requirements, and a three-layer co-extrusion film blowing machine is used for blowing and forming the film, the fracture of the blown three-layer co-extrusion PE film is linearly regular after being torn from any point in the transverse direction and the longitudinal direction, so that the selection of a longitudinal opening is increased when the prepared film is used as a packaging bag, the application range of the film is expanded, and the use convenience is enhanced.
2. According to the PE film prepared by the three-layer co-extrusion up-blowing wind cooling method, each layer structure is made of special raw materials, and specific thickness proportion requirements are adopted among layers, wherein the inner layer accounts for 30% of the total thickness, the middle layer accounts for 40% of the total thickness, and the outer layer accounts for 30% of the total thickness; the prepared linear easy-to-tear PE film has good stability and good physical properties such as weather resistance and the like.
Drawings
Fig. 1 is a process flow chart of a preparation method of a linear easy-to-tear PE film of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present embodiment provides a technical solution:
example 1
The utility model provides a straight line easily tears PE film, includes the three-layer and crowds the layer altogether, and the three-layer is crowded the layer altogether and is become by inlayer base film, middle level base film and outer base film group, and inlayer base film, middle level base film and outer base film are all made by polyethylene and Cyclic Olefin Copolymer (COC) plastic granules of different physical properties, and three-layer base film each component is as follows according to the mass percentage:
the thickness of the inner base film accounts for 30% of the total thickness, and the inner base film comprises the following components in percentage by mass:
cycloolefin copolymer (COC): 30 percent of the total weight of the mixture,
metallocene linear polyethylene: 10 percent of the total weight of the mixture,
low density polyethylene: 40 percent of the total weight of the mixture,
linear low density polyethylene: 20 percent;
the thickness of the middle base film accounts for 40% of the total thickness, and the middle base film comprises the following components in percentage by mass:
cycloolefin copolymer (COC): 35 percent of the total weight of the mixture,
low density polyethylene: 65 percent;
the thickness of the outer base film accounts for 30% of the total thickness, and the outer base film comprises the following components in percentage by mass:
cycloolefin copolymer (COC): 35 percent of the total weight of the mixture,
low density polyethylene: 45 percent of the total weight of the mixture,
linear low density polyethylene: 20 percent.
Wherein the cycloolefin copolymer (COC) is 8007F as raw material for Japanese Baochi plastics production, and has a density of 1.010kg/m 3 Physical compatibility means 1.3 g/10 min;
the metallocene linear polyethylene is metallocene catalytic polyethylene which adopts octene as comonomer, is a raw material 8CMLLDPE 1327CA produced by Exxon chemistry, and has the physical property fusion index of 1.3 g/10 min and the fusion point of 122 ℃;
the low-density polyethylene is raw material LDPE 2426K for petrochemical production of the Zhonghai shell, the physical property melting means 4 g/10 min, and the melting point is 110-112 ℃;
the linear low-density polyethylene of the inner-layer basal membrane is LLDPE Q2018H which is a raw material in Katalr petrochemical production, the physical property melting index is 2 g/10 min, and the melting point is 110 ℃;
the linear low-density polyethylene of the outer-layer basal membrane is LLDPE7042 which is a raw material for famous petrochemical production, and the physical property melt index is 2 g/10 min, and the melt point is 110 ℃.
In embodiment 1, a method for preparing a linear easy-tear PE film by a three-layer coextrusion up-blowing method includes the following steps:
1) parameter setting of three-layer co-extrusion film blowing machine
a) Selecting the temperature, wherein the temperature of an inner layer screw material barrel of the three-layer co-extrusion film blowing machine is 180 ℃, the temperature of a middle layer screw material barrel is 200 ℃, the temperature of an outer layer screw material barrel is 180 ℃, and the temperature of a die head runner is 195 ℃;
b) selecting air cooling temperature, wherein the air cooling temperature is 15 ℃;
c) selecting a blow-up ratio of 1: 1.1;
d) selecting a condensation line, and selecting a condensation line 220;
2) preparation of inner base film
Uniformly mixing the raw materials of the inner base film according to a preparation proportion, adding the mixture into an inner hopper of a three-layer co-extrusion film blowing machine, setting the temperature of a screw charging barrel to be 180 ℃, and extruding the mixture into the inner base film of the three-layer co-extrusion layer through a screw;
3) preparation of the middle base film
Uniformly mixing the raw materials of the middle-layer base film according to a preparation proportion, adding the mixture into a middle-layer hopper of a three-layer co-extrusion film blowing machine, setting the temperature of a screw charging barrel to be 200 ℃, and extruding the mixture into the middle-layer base film of the three-layer co-extrusion layer through a screw;
4) preparation of outer base film
Uniformly mixing the raw materials of the outer-layer base film according to a preparation proportion, setting the temperature of a screw charging barrel to be 180 ℃ by an outer-layer hopper, and extruding the mixture into the outer-layer base film of the three-layer co-extrusion layer by a screw;
5) the inner, middle and outer three layers of base films are extruded and blown from a screw rod through a die head of a three-layer co-extrusion film blowing machine to form a finished film, and the die head temperature of the three-layer co-extrusion film blowing machine is set to be 195 ℃.
Example 2
The utility model provides a PE film is easily torn to straight line, includes three-layer coextrusion layer, three-layer coextrusion layer comprises inlayer base film, middle level base film and outer base film, inlayer base film, middle level base film and outer base film are all made by polyethylene and Cyclic Olefin Copolymer (COC) plastic granules of different physical properties, and three-layer base film each component is as follows according to the mass percentage:
the thickness of the inner base film accounts for 30% of the total thickness, and the inner base film comprises the following components in percentage by mass:
cycloolefin copolymer (COC): 35 percent of the total weight of the mixture,
metallocene linear polyethylene: 12 percent of the total weight of the mixture,
low density polyethylene: 35 percent of the total weight of the mixture,
linear low density polyethylene: 18 percent;
the thickness of the middle base film accounts for 40% of the total thickness, and the middle base film comprises the following components in percentage by mass:
cycloolefin copolymer (COC): 25 percent of the total weight of the mixture,
low density polyethylene: 75 percent;
the thickness of the outer base film accounts for 30% of the total thickness, and the outer base film comprises the following components in percentage by mass:
cycloolefin copolymer (COC): 30 percent of the total weight of the mixture,
low density polyethylene: 40 percent of the total weight of the mixture,
linear low density polyethylene: 30 percent.
Wherein the cycloolefin copolymer (COC) is 8007F as raw material for Japanese Baochi plastics production, and has a density of 1.010kg/m 3 Physical compatibility means 1.3 g/10 min;
the metallocene linear polyethylene is metallocene catalytic polyethylene which adopts octene as comonomer, is a raw material 8CMLLDPE 1327CA produced by Exxon chemistry, and has the physical property fusion index of 1.3 g/10 min and the fusion point of 122 ℃;
the low-density polyethylene is raw material LDPE 2426K for petrochemical production of the Zhonghai shell, the physical property melting means 4 g/10 min, and the melting point is 110-112 ℃;
the linear low-density polyethylene of the inner-layer basal membrane is LLDPE Q2018H which is a raw material in Katalr petrochemical production, the physical property melting index is 2 g/10 min, and the melting point is 110 ℃;
the linear low-density polyethylene of the outer-layer basal membrane is LLDPE7042 which is a raw material for famous petrochemical production, and the physical property melt index is 2 g/10 min, and the melt point is 110 ℃.
In embodiment 2, a method for preparing a linear easy-tear PE film by a three-layer coextrusion up-blowing method includes the following steps:
1) parameter setting of three-layer co-extrusion film blowing machine
a) Selecting the temperature, wherein the temperature of an inner layer screw cylinder of the three-layer co-extrusion film blowing machine is 175 ℃, the temperature of a middle layer screw cylinder is 200 ℃, the temperature of an outer layer screw cylinder is 180 ℃, and the temperature of a die head runner is 190 ℃;
b) selecting air cooling temperature, wherein the air cooling temperature is 13 ℃;
c) selecting a blow-up ratio of 1: 1.1;
d) selecting a condensation line, namely selecting a condensation line 200;
2) preparation of inner base film
Uniformly mixing the raw materials of the inner base film according to a preparation proportion, adding the mixture into an inner hopper of a three-layer co-extrusion film blowing machine, setting the temperature of a screw charging barrel to be 175 ℃, and extruding the mixture into the inner base film of the three-layer co-extrusion layer through a screw;
3) preparation of the middle base film
Uniformly mixing the raw materials of the middle-layer base film according to a preparation proportion, adding the mixture into a middle-layer hopper of a three-layer co-extrusion film blowing machine, setting the temperature of a screw charging barrel to be 200 ℃, and extruding the mixture into the middle-layer base film of the three-layer co-extrusion layer through a screw;
4) preparation of outer base film
Uniformly mixing the raw materials of the outer-layer base film according to a preparation proportion, setting the temperature of a screw charging barrel to be 180 ℃ by an outer-layer hopper, and extruding the mixture into the outer-layer base film of the three-layer co-extrusion layer by a screw;
5) the inner, middle and outer three-layer base films are extruded and blown from a screw rod through a die head of a three-layer co-extrusion film blowing machine to form a finished film, and the die head temperature of the three-layer co-extrusion film blowing machine is set to be 190 ℃.
Example 3
The utility model provides a PE film is easily torn to straight line, includes three-layer coextrusion layer, three-layer coextrusion layer comprises inlayer base film, middle level base film and outer base film, inlayer base film, middle level base film and outer base film are all made by polyethylene and Cyclic Olefin Copolymer (COC) plastic granules of different physical properties, and three-layer base film each component is as follows according to the mass percentage:
the thickness of the inner base film accounts for 30% of the total thickness, and the inner base film comprises the following components in percentage by mass:
cycloolefin copolymer (COC): 25 percent of the total weight of the mixture,
metallocene linear polyethylene: 8 percent of the total weight of the mixture,
low density polyethylene: 45 percent of the total weight of the mixture,
linear low density polyethylene: 22 percent;
the thickness of the middle base film accounts for 40% of the total thickness, and the middle base film comprises the following components in percentage by mass:
cycloolefin copolymer (COC): 45 percent of the total weight of the mixture,
low density polyethylene: 55 percent;
the thickness of the outer base film accounts for 30% of the total thickness, and the outer base film comprises the following components in percentage by mass:
cycloolefin copolymer (COC): 40 percent of the total weight of the mixture,
low density polyethylene: 45 percent of the total weight of the mixture,
linear low density polyethylene: 15 percent.
Wherein the cycloolefin copolymer (COC) is 8007F as raw material for Japanese Baochi plastics production, and has a density of 1.010kg/m 3 Physical compatibility means 1.3 g/10 min;
the metallocene linear polyethylene is metallocene catalytic polyethylene which adopts octene as comonomer, is a raw material 8CMLLDPE 1327CA produced by Exxon chemistry, and has the physical property fusion index of 1.3 g/10 min and the fusion point of 122 ℃;
the low-density polyethylene is raw material LDPE 2426K for petrochemical production of the Chinese seashell, the physical property melting means 4 g/10 min, and the melting point is 110-112 ℃;
the linear low-density polyethylene of the inner-layer basal membrane is LLDPE Q2018H which is a raw material in Katalr petrochemical production, the physical property melting index is 2 g/10 min, and the melting point is 110 ℃;
the linear low-density polyethylene of the outer-layer basal membrane is LLDPE7042 which is a raw material for famous petrochemical production, and the physical property melt index is 2 g/10 min, and the melt point is 110 ℃.
In embodiment 3, a method for preparing a linear easy-tear PE film by a three-layer coextrusion up-blowing method includes the following steps:
1) parameter setting of three-layer co-extrusion film blowing machine
a) Selecting the temperature, wherein the temperature of an inner layer screw material cylinder of the three-layer co-extrusion film blowing machine is 180 ℃, the temperature of a middle layer screw material cylinder is 205 ℃, the temperature of an outer layer screw material cylinder is 185 ℃, and the temperature of a die head runner is 195 ℃;
b) selecting air cooling temperature, namely selecting air cooling temperature of 18 ℃;
c) selecting a blow-up ratio of 1: 1.2;
d) selecting a condensation line, wherein the condensation line is 250 mm;
2) preparation of inner base film
Uniformly mixing the raw materials of the inner base film according to a preparation proportion, adding the mixture into an inner hopper of a three-layer co-extrusion film blowing machine, setting the temperature of a screw charging barrel to be 180 ℃, and extruding the mixture into the inner base film of the three-layer co-extrusion layer through a screw;
3) preparation of the middle base film
Uniformly mixing the raw materials of the middle-layer base film according to a preparation proportion, adding the mixture into a middle-layer hopper of a three-layer co-extrusion film blowing machine, setting the temperature of a screw charging barrel to be 205 ℃, and extruding the mixture into the middle-layer base film of the three-layer co-extrusion layer through a screw;
4) preparation of outer base film
Uniformly mixing the raw materials of the outer-layer base film according to a preparation proportion, setting the temperature of a screw charging barrel to be 185 ℃ by an outer-layer hopper, and extruding the mixture into the outer-layer base film of the three-layer co-extrusion layer by a screw;
5) the inner, middle and outer three layers of base films are extruded and blown from a screw rod through a die head of a three-layer co-extrusion film blowing machine to form a finished film, and the die head temperature of the three-layer co-extrusion film blowing machine is set to be 195 ℃.
Examples of the experiments
Evaluation of Linear tear Properties of Linear easy-to-tear PE films prepared in examples 1 to 3
1. Experimental methods
Cutting a film with a certain width Ws, cutting a crack at the middle position in the width direction, tearing the film along the crack direction at a constant speed, measuring the width We of the other end of the film, and calculating the deviation alpha of the film tearing according to the following formula:
α＝(1/2Ws-We)/1/2Ws×100％。
it should be noted that the cut film length should be greater than 20cm, and in this embodiment, Ws is 5 cm.
2. Experimental procedures
For examples 1 to 3, 60 films each having a width of 5cm and a length of 22cm were cut out in the transverse direction and the longitudinal direction, respectively, and after tearing, α was determined, and then the transverse average value and the longitudinal average value were determined, respectively.
3. Evaluation criteria
The average value of alpha is less than or equal to +/-10 percent, and the linear tearability is very good; the linear tearing property is good when the alpha is more than or equal to +/-10 percent and less than or equal to +/-30 percent; > +/-30% alpha is poor linear tearability.
4. Evaluation results
Example 1: the average value α in the transverse direction was 7.3%, and the linear tearability was very good, and the average value α in the longitudinal direction was 7.9%, and the linear tearability was very good.
Example 2: the average value α in the transverse direction was 8.5%, and the linear tearability was very good, and the average value α in the longitudinal direction was 9.1%, and the linear tearability was very good.
Example 3: the average value α in the transverse direction was 9.6%, and the linear tearability was very good, and the average value α in the longitudinal direction was 8.9%, and the linear tearability was very good.
According to the result data analysis, the straight-line easy-to-tear PE film prepared by the method has excellent straight-line tearing performance.
The linear tear performance evaluation method refers to the conventional evaluation method.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (9)

1. The utility model provides a straight line easily tears PE film which characterized in that: the plastic film comprises three co-extrusion layers, wherein each co-extrusion layer consists of an inner base film, a middle base film and an outer base film, the inner base film, the middle base film and the outer base film are all made of polyethylene and Cyclic Olefin Copolymer (COC) plastic particles with different physical properties, and the three base films comprise the following components in percentage by mass:
the thickness of the inner base film accounts for 20-40% of the total thickness, and the inner base film comprises the following components in percentage by mass:
cycloolefin copolymer (COC): 20 to 40 percent of the total weight of the mixture,
metallocene linear polyethylene: 6 to 14 percent of the total weight of the mixture,
low density polyethylene: 30 to 50 percent of the total weight of the mixture,
linear low density polyethylene: 10% -30%;
the thickness of the middle base film accounts for 20-60% of the total thickness, and the middle base film comprises the following components in percentage by mass:
cycloolefin copolymer (COC): 25 to 45 percent of the total weight of the mixture,
low density polyethylene: 55% -75%;
the thickness of the outer base film accounts for 20-40% of the total thickness, and the outer base film comprises the following components in percentage by mass:
cycloolefin copolymer (COC): 25 to 45 percent of the total weight of the mixture,
low density polyethylene: 35 to 55 percent of the total weight of the mixture,
linear low density polyethylene: 10% -30%;
the cycloolefin copolymer (COC) is a raw material 8007F for Japanese Baochi plastics production and has a density of 1.010kg/m 3 Physical consistency means 1.3 g/10 min;
the metallocene linear polyethylene is metallocene catalytic polyethylene adopting octene as comonomer, is a raw material 8CMLLDPE 1327CA produced by Exxon chemistry, and has a melting point of 1.3 g/10 min and a melting point of 122 ℃;
the low-density polyethylene is LDPE 2426K which is a raw material for petrochemical production of the Chinese seashell, the physical property melting means 4 g/10 min, and the melting point is 110-112 ℃;
the linear low-density polyethylene of the inner-layer basal membrane is LLDPE Q2018H which is a raw material in Katalr petrochemical production, the physical property melting index is 2 g/10 min, and the melting point is 110 ℃;
the linear low-density polyethylene of the outer-layer basal membrane is LLDPE7042 which is a raw material for famous petrochemical production, and the physical property melt index is 2 g/10 min, and the melt point is 110 ℃.
2. The linear easy-tear PE film according to claim 1, wherein: the thickness of the inner base film accounts for 30% of the total thickness, the thickness of the middle base film accounts for 40% of the total thickness, and the thickness of the outer base film accounts for 30% of the total thickness.
3. The linear easy-tear PE film according to claim 2, wherein: the inner base film comprises the following components in percentage by mass:
cycloolefin copolymer (COC): 30 percent of the total weight of the mixture,
metallocene linear polyethylene: 10 percent of the total weight of the mixture,
low density polyethylene: 40 percent of the total weight of the mixture,
linear low density polyethylene: 20 percent;
the middle-layer basement membrane comprises the following components in percentage by mass:
cycloolefin copolymer (COC): 35 percent of the total weight of the mixture,
low density polyethylene: 65 percent;
the outer-layer base film comprises the following components in percentage by mass:
cycloolefin copolymer (COC): 35 percent of the total weight of the mixture,
low density polyethylene: 45 percent of the total weight of the mixture,
linear low density polyethylene: 20 percent.
4. The preparation process of the linear easy-to-tear PE film according to claim 3, wherein the preparation process comprises the following steps: the method for preparing the film by adopting a three-layer coextrusion up-blowing method comprises the following steps:
1) parameter setting of three-layer co-extrusion film blowing machine
a) Selecting the temperature, wherein the temperature of an inner layer screw material cylinder of a three-layer co-extrusion film blowing machine is 175-180 ℃, the temperature of a middle layer screw material cylinder is 200-205 ℃, the temperature of an outer layer screw material cylinder is 180-185 ℃, and the temperature of a die head runner is 190-195 ℃;
b) selecting air cooling temperature, wherein the air cooling temperature is 13-18 ℃;
c) selecting a blow-up ratio, wherein the proportion range of the blow-up ratio is 1: 1.1-1: 1.2;
d) selecting a condensation line, wherein the condensation line is selected within the range of 200mm to 250 mm;
2) preparation of inner base film
Uniformly mixing the raw materials of the inner base film according to a preparation proportion, adding the mixture into an inner hopper of a three-layer co-extrusion film blowing machine, setting the temperature of a screw charging barrel to be 175-180 ℃, and extruding the mixture into the inner base film of the three-layer co-extrusion layer through a screw;
3) preparation of the middle base film
Uniformly mixing the raw materials of the middle-layer base film according to a preparation proportion, adding the mixture into a middle-layer hopper of a three-layer co-extrusion film blowing machine, setting the temperature of a screw charging barrel to be 200-205 ℃, and extruding the mixture into the middle-layer base film of the three-layer co-extrusion layer through a screw;
4) preparation of outer base film
Uniformly mixing the raw materials of the outer-layer base film according to a preparation proportion, setting the temperature of a screw charging barrel to be 180-185 ℃ by an outer-layer hopper, and extruding the mixture into the outer-layer base film of the three-layer co-extrusion layer by a screw;
5) the inner, middle and outer three layers of base films are extruded and blown from a screw rod through a die head of a three-layer co-extrusion film blowing machine to form a finished film, and the die head temperature of the three-layer co-extrusion film blowing machine is set to be 190-195 ℃.
5. The preparation process of the linear easy-to-tear PE film according to claim 4, wherein the preparation process comprises the following steps: 1) in the method, the air cooling temperature is 15 ℃, and the blow-up ratio is 1: 1.1.
6. The preparation process of the linear easy-to-tear PE film according to claim 4, wherein the preparation process comprises the following steps: 2) and in the middle layer, the inner layer screw extruder performs extrusion operation at the temperature of the screw cylinder of 180 ℃.
7. The preparation process of the linear easy-to-tear PE film according to claim 4, wherein the preparation process comprises the following steps: 3) and the middle layer screw extruder performs extrusion operation at the temperature of the screw cylinder of 200 ℃.
8. The preparation process of the linear easy-to-tear PE film according to claim 4, wherein the preparation process comprises the following steps: 4) and the outer layer screw extruder performs extrusion operation at the temperature of the screw cylinder of 180 ℃.
9. The preparation process of the linear easy-to-tear PE film according to claim 4, wherein the preparation process comprises the following steps: 5) and in the middle, the die head of the three-layer co-extrusion film blowing machine carries out extrusion operation at the temperature of 190 ℃.
CN202210506376.4A 2022-05-10 2022-05-10 Linear easily-torn PE film and preparation process thereof Pending CN114851662A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040067382A1 (en) * 2002-08-09 2004-04-08 Ralf Niepelt Sealable film for tear-open packaging
JP2007245612A (en) * 2006-03-17 2007-09-27 Dainippon Ink & Chem Inc Co-extruded multilayered film and packaging material using this film
CN103072351A (en) * 2013-01-18 2013-05-01 四川汇利实业有限公司 Linear easy-to-tear composite film or bag
CN110281621A (en) * 2019-07-19 2019-09-27 河南省银丰塑料有限公司 A kind of polyethylene is two-way easily to tear packaging film

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040067382A1 (en) * 2002-08-09 2004-04-08 Ralf Niepelt Sealable film for tear-open packaging
JP2007245612A (en) * 2006-03-17 2007-09-27 Dainippon Ink & Chem Inc Co-extruded multilayered film and packaging material using this film
CN103072351A (en) * 2013-01-18 2013-05-01 四川汇利实业有限公司 Linear easy-to-tear composite film or bag
CN110281621A (en) * 2019-07-19 2019-09-27 河南省银丰塑料有限公司 A kind of polyethylene is two-way easily to tear packaging film

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