CN113895118A - Polyolefin stretched film, preparation method and application thereof - Google Patents

Polyolefin stretched film, preparation method and application thereof Download PDF

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Publication number
CN113895118A
CN113895118A CN202110990754.6A CN202110990754A CN113895118A CN 113895118 A CN113895118 A CN 113895118A CN 202110990754 A CN202110990754 A CN 202110990754A CN 113895118 A CN113895118 A CN 113895118A
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heat
layer
polyethylene
10min
density
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杨军
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Shanghai Diyun Packaging Material Co ltd
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Shanghai Diyun Packaging Material 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
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of 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
    • 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
    • B32B2307/50—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
    • B32B2439/00—Containers; Receptacles
    • B32B2439/40—Closed containers
    • B32B2439/62—Boxes, cartons, cases
    • 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
    • B32B2439/70—Food packaging
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • 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
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/06—Polyethene

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)

Abstract

The present application relates to the field of packaging filmsIn particular to a polyolefin stretch film, a preparation method and application thereof. The polyolefin stretch film comprises a non-heat-sealing layer, a middle layer and a heat-sealing layer; the material of the non-heat sealing layer has a melt index of 0.3-5 g/10min and a density of 0.93-0.94 g/cm3Polyethylene with melting temperature of 115-130 ℃; the intermediate layer material has a melt index of 0.3-5 g/10min and a density of 0.90-0.92 g/cm3Polyethylene with melting temperature of 115-130 ℃; the material of the heat-sealing layer has a melt index of 0.3-5 g/10min and a density of 0.91-0.925 g/cm3Polyethylene with melting temperature of 100-110 ℃; the thickness of the polyolefin stretched film is 60-250 mu m. The low-temperature puncture-resistant impact-resistant performance of the stretch film is good, and the stretch film is suitable for packaging of frozen foods.

Description

Polyolefin stretched film, preparation method and application thereof
Technical Field
The application relates to the field of packaging films, in particular to a polyolefin stretch film, a preparation method and application thereof.
Background
With the diversification development of family diets, the demand for various food materials is increasingly increased, and the development of the frozen and refrigerated food industry is promoted. The frozen food is processed by freezing, and retains original quality and sanitary state of food for a long time in original freshness or processing state. At present, most of quick-frozen foods are packaged by adopting a plastic stretching film.
At present, most of stretch films in the market use nylon/polyethylene co-extrusion film products, the formula of the nylon/polyethylene co-extrusion film products is usually PA/tie/PA/tie/PE or PA/tie/PE/tie/PA/tie/Pe and the like, the commonly used nylon/polyethylene co-extrusion film has a complex structure and higher requirements on production equipment, and at least 5 layers of co-extrusion equipment are required during the production of the stretch film, and sometimes 7 layers or 9 layers of co-extrusion equipment are even required for production. In addition, different materials such as nylon, polyolefin and the like are involved, so that the materials are not easy to recycle, and the compatibility among the materials is poor, so that the nylon/polyolefin co-extruded film is easy to harden at low temperature, and the puncture resistance and impact resistance after freezing are poor, and the requirements of quick-frozen food packaging cannot be met.
Therefore, it is very important to develop a stretched film which has a simple structure, low requirements for production equipment, and good low-temperature puncture resistance and impact resistance.
Disclosure of Invention
In order to reduce the requirements of a stretched film on production equipment, improve the low-temperature puncture resistance and impact resistance of the stretched film and facilitate the recovery and reuse of the stretched film, the application provides a polyolefin stretched film, and a preparation method and application thereof.
In a first aspect, the present application provides a polyolefin stretch film, which adopts the following technical scheme:
the polyolefin stretch film comprises a non-heat-sealing layer, a middle layer and a heat-sealing layer, wherein the non-heat-sealing layer and the heat-sealing layer are respectively fixed on two sides of the middle layer;
the material of the non-heat sealing layer has a melt index of 0.3-5 g/10min and a density of 0.93-0.94 g/cm3Polyethylene with a melting temperature of 115-130 ℃ or a melt index of 0.3-8 g/10min and a density of 0.89-0.91 g/cm3Polypropylene with a melting temperature of 115-150 ℃;
the intermediate layer material has a melt index of 0.3-5 g/10min and a density of0.90～0.92g/cm3Polyethylene with melting temperature of 115-130 ℃;
the material of the heat-sealing layer has a melt index of 0.3-5 g/10min and a density of 0.91-0.925 g/cm3Polyethylene with melting temperature of 100-110 ℃;
the thickness of the polyolefin stretched film is 60-250 mu m.
By adopting the technical scheme, compared with the existing nylon/polyethylene co-extruded film and the like, the polyolefin film is soft and not hard at low temperature, has high toughness, excellent tensile thermal forming performance and good low-temperature puncture resistance and impact resistance, is suitable for the frozen food processing industry, and can be used for frozen food packaging. The stretch film comprises three layers of polyolefin materials, can be produced by using three-layer co-extrusion equipment during production, has lower requirements on production equipment, and simultaneously, each layer of material is the polyolefin material instead of other materials such as nylon, is also favorable for recycling waste films, and is favorable for recycling economy.
The non-heat-sealing layer is made of polyethylene with relatively high melting temperature, the main function of the non-heat-sealing layer is to provide structural strength and temperature resistance required by the film, the temperature gradient difference of the melting temperature formed by the non-heat-sealing layer and the heat-sealing layer is reduced, and the condition that a knife is stuck in the bag making and heat sealing processes in the follow-up process is reduced. The main functions of the interlayer material are to provide better tensile strength for the polyolefin stretched film, so that the polyolefin stretched film is uniformly stretched and has no damage in the stretching process, and provide excellent low-temperature puncture resistance and impact resistance, so that the polyolefin stretched film has excellent toughness at low temperature. The heat sealing layer is made of polyethylene with a lower melting temperature relative to the non-heat sealing layer, so that the polyolefin stretched film can be subjected to heat sealing at a lower temperature, and meanwhile, the low-temperature toughness of the polyolefin stretched film is improved.
Preferably, the material of the non-heat-sealing layer has a melt index of 0.5-1.2 g/10min and a density of 0.934-0.935 g/cm3Polyethylene with a melting temperature of 120-130 ℃.
Preferably, the intermediate layer material has a melt index of 1.7-1.8 g/10min and a density of 0.906-0.91 g/cm3The melting temperature is 115-130 DEG CPolyethylene;
preferably, the material of the heat-sealing layer has a melt index of 0.3-1.9 g/10min and a density of 0.92-0.922 g/cm3Polyethylene with melting temperature of 100-110 ℃;
by adopting the technical scheme, the physical parameters of the non-heat-seal layer material, the intermediate layer material and the heat-seal layer material are further optimized, so that the low-temperature puncture-resistant impact-resistant performance of the polyolefin stretch film is improved, and the low-temperature toughness of the stretch film is improved.
Preferably, the material of the non-heat sealing layer has a melt index of 1.2g/10min and a density of 0.934g/cm3Polyethylene with a melting temperature of 122 ℃;
the material of the intermediate layer has a melt index of 1.8g/10min and a density of 0.906g/cm3Polyethylene with a melting temperature of 122 ℃;
the material of the heat-sealing layer has a melt index of 1.9g/10min and a density of 0.92g/cm3And polyethylene having a melting temperature of 109 ℃.
By adopting the technical scheme, the polyolefin stretched film is prepared by co-extruding the materials according to the weight ratio of 1:1:1, when the thickness of the polyolefin stretched film is 160 mu m, the puncture strength of the stretched film at the temperature of minus 40 ℃ is 3.7N, and the impact strength at the temperature of minus 40 ℃ is 1.34J, which shows that the stretched film has better mechanical properties at low temperature.
Preferably, the thickness of the polyolefin stretched film is 100 to 220 μm.
By adopting the technical scheme, the mechanical property of the stretched film at low temperature is improved by further optimizing the thickness of the polyolefin stretched film.
Preferably, the thickness of the polyolefin stretch film is 160 μm.
By adopting the technical scheme, when the thickness of the polyolefin stretched film is 160 mu m, the puncture strength of the stretched film at-40 ℃ can reach 2.6-3.7N, and the impact strength at-40 ℃ can reach 1.08-1.34J, which shows that the polyolefin stretched film has better mechanical properties at low temperature.
In a second aspect, the present application provides a method for preparing a polyolefin stretch film, which adopts the following technical scheme:
a preparation method of a polyolefin stretch film comprises the steps of co-extruding a heat-seal layer material, an intermediate layer material and a non-heat-seal layer material into a film by using three-layer co-extrusion equipment, wherein the temperature of a charging barrel is 180-230 ℃, and the temperature of a die head is 210-230 ℃.
Preferably, the three-layer co-extrusion equipment is a three-layer co-extrusion casting machine or a three-layer co-extrusion film blowing machine.
By adopting the technical scheme, the polyolefin stretch film is simple in structure, low in requirement on production equipment, capable of being produced by using three-layer co-extrusion equipment and simple in production steps.
In a third aspect, the present application provides an application of a polyolefin stretch film, which adopts the following technical scheme:
use of a stretched polyolefin film in the frozen food processing industry.
Through adopting above-mentioned technical scheme, the tensile membrane of this application has better low temperature puncture resistance and low temperature impact resistance, has better mechanical strength at low temperature, simultaneously, still has better low temperature toughness, can be used to preparation frozen food package box.
In summary, the present application has the following beneficial effects:
1. the polyolefin stretch film is soft but not hard at low temperature, has good low-temperature toughness, good low-temperature puncture resistance and good low-temperature impact resistance, can be suitable for frozen food processing industry, and is used for preparing frozen food packaging boxes;
2. the polyolefin stretch film has a simple structure, only consists of three layers of polyolefin materials, has low requirements on production equipment, and can be produced by using three layers of co-extrusion equipment during production;
3. the material of this application stretch film is polyolefin material entirely, does not use other materials such as nylon, is favorable to the recovery and reuse of old and useless stretch film, is favorable to recycling economy's development.
Detailed Description
The present application will be described in further detail with reference to examples.
The production equipment used in the examples of the present application is commercially available except for the following specific descriptions:
the three-layer co-extrusion casting machine is produced by Fujianwei sanden mechanical Co Ltd, and has the model: ws150-BF 2800;
the three-layer co-extrusion film blowing machine is obtained from Dongguan treasure precision instruments Co., Ltd, model: BP-8178-B.
Examples
Example 1
A polyolefin stretch film with the thickness of 60 mu m comprises a non-heat-sealing layer, a middle layer and a heat-sealing layer, wherein the non-heat-sealing layer and the heat-sealing layer are respectively fixed on two sides of the middle layer.
Wherein the material of the non-heat-sealing layer is polyethylene 4009MC, which is obtained from Exxon Mobil chemical industry, has a melt index of 0.9g/10min (190 deg.C/2.16 kg), and a density of 0.94g/cm3The melting temperature is 125 ℃;
the middle layer is made of polyethylene 41E850 (Dow chemical), has a melt index of 1g/10min (190 deg.C/2.16 kg), and a density of 0.9g/cm3The melting temperature is 120 ℃;
the heat sealing layer is made of polyethylene LD 100, which is obtained from Exxon Mobil chemical industry, and has a melt index of 2g/10min (190 ℃/2.16kg) and a density of 0.923g/cm3The melting temperature was 110 ℃.
The preparation method of the polyolefin stretch film in the embodiment is as follows: and co-extruding the heat-seal layer material, the intermediate layer material and the non-heat-seal layer material into a film by using a three-layer co-extrusion casting machine. The material consumption of the heat-sealing layer, the material consumption of the intermediate layer and the material consumption of the non-heat-sealing layer are all 10kg, the temperature of a charging barrel of the casting machine is 190-220 ℃, and the temperature of a die head is 220 ℃.
Example 2
A polyolefin stretch film having a thickness of 60 μm, which is different from that of example 1 in that: the non-heat-sealable layers are of different materials.
In this example, the non-heat-sealing layer was polypropylene RD208CF obtained from northern Europe chemical engineering and having a melt index of 8g/10min (230 ℃/2.16kg) and a density of 0.9g/cm3The melting temperature was 140 ℃.
The preparation method of the polyolefin stretch film in the embodiment is as follows: and co-extruding the heat-seal layer material, the intermediate layer material and the non-heat-seal layer material into a film by using a three-layer co-extrusion casting machine. The material consumption of the heat-sealing layer, the material consumption of the intermediate layer and the material consumption of the non-heat-sealing layer are all 10kg, the temperature of a charging barrel of the casting machine is 200-230 ℃, and the temperature of a die head is 230 ℃.
Example 3
A polyolefin stretch film having a thickness of 160 μm, which is different from that of example 1 in that: the non-heat sealable layer material is different from the intermediate layer material.
In this example, the non-heat-sealing layer was made of polyethylene UR534 (manufactured by Letian chemical Co., Ltd.), and had a melt index of 3.5g/10min (190 ℃/2.16kg) and a density of 0.93g/cm3The melting temperature is 120 ℃;
the middle layer is made of polyethylene 41E762, which is prepared from Dow chemical, has a melt index of 2.5g/10min (190 deg.C/2.16 kg), and a density of 0.92g/cm3The melting temperature was 127 ℃.
The preparation method of the polyolefin stretch film in the embodiment is as follows: and co-extruding the heat-seal layer material, the intermediate layer material and the non-heat-seal layer material to form a film by using a three-layer co-extrusion film blowing machine. Wherein the usage amount of the heat-seal layer material, the intermediate layer material and the non-heat-seal layer material is 10kg, the charging barrel temperature of the film blowing machine is 200-230 ℃, and the die head temperature is 230 ℃.
Example 4
A polyolefin stretch film having a thickness of 250 μm, which is different from that of example 1 in that: the non-heat sealable layer material is different from the intermediate layer material.
In this example, the non-heat-sealing layer was made of polyethylene UR644 obtained from Letian chemical, and had a melt index of 5g/10min (190 ℃/2.16kg) and a density of 0.935g/cm3The melting temperature is 124 ℃;
the middle layer is made of polyethylene 41E766 which is prepared from Dow chemical, has a melt index of 2.2g/10min (190 deg.C/2.16 kg), and has a density of 0.91g/cm3The melting temperature was 121 ℃.
The preparation method of the polyolefin stretch film in the embodiment is as follows: and co-extruding the heat-seal layer material, the intermediate layer material and the non-heat-seal layer material into a film by using a three-layer co-extrusion casting machine. The material consumption of the heat-sealing layer, the material consumption of the intermediate layer and the material consumption of the non-heat-sealing layer are all 10kg, the temperature of a charging barrel of the casting machine is 190-220 ℃, and the temperature of a die head is 220 ℃.
Example 5
A polyolefin stretch film having a thickness of 160 μm, which is different from that of example 2 in that: the non-heat-sealable layers are of different materials.
In this example, the non-heat-seal layer was polyethylene 3505MC, obtained from Exxon Mobil chemical, having a melt index of 0.5g/10min (190 ℃/2.16kg) and a density of 0.935g/cm3The melting temperature was 123 ℃.
The preparation method of the polyolefin stretch film in the embodiment is as follows: and co-extruding the heat-seal layer material, the intermediate layer material and the non-heat-seal layer material into a film by using a three-layer co-extrusion casting machine. The material consumption of the heat-sealing layer, the material consumption of the intermediate layer and the material consumption of the non-heat-sealing layer are all 10kg, the temperature of a charging barrel of the casting machine is 180-210 ℃, and the temperature of a die head is 210 ℃.
Example 6
A polyolefin stretch film having a thickness of 160 μm, which is different from that of example 2 in that: the non-heat-sealable layers are of different materials.
In this example, the non-heat-sealing layer was made of polyethylene ME0420 obtained from northern Europe chemical engineering, and had a melt index of 1.2g/10min (190 deg.C/2.16 kg) and a density of 0.934g/cm3The melting temperature was 122 ℃.
The preparation method of the polyolefin stretch film in the embodiment is as follows: and co-extruding the heat-seal layer material, the intermediate layer material and the non-heat-seal layer material into a film by using a three-layer co-extrusion casting machine. The material consumption of the heat-sealing layer, the material consumption of the intermediate layer and the material consumption of the non-heat-sealing layer are all 10kg, the temperature of a charging barrel of the casting machine is 180-210 ℃, and the temperature of a die head is 210 ℃.
Example 7
A polyolefin stretch film having a thickness of 160 μm, which is different from that of example 5 in that: the interlayer material is different.
In this example, the middle layer was made of polyethylene 41E687 from Dow chemical, and had a melt index of 1.7g/10min (190 ℃/2.16kg) and a density of 0.91g/cm3The melting temperature was 119 ℃.
The preparation method of the polyolefin stretch film in the embodiment is as follows: and co-extruding the heat-seal layer material, the intermediate layer material and the non-heat-seal layer material into a film by using a three-layer co-extrusion casting machine. The material consumption of the heat-sealing layer, the material consumption of the intermediate layer and the material consumption of the non-heat-sealing layer are all 10kg, the temperature of a charging barrel of the casting machine is 180-210 ℃, and the temperature of a die head is 210 ℃.
Example 8
A polyolefin stretch film having a thickness of 160 μm, which is different from that of example 5 in that: the interlayer material is different.
In this example, the middle layer was polyethylene 41E1451B, from Dow chemical, having a melt index of 1.8g/10min (190 ℃/2.16kg) and a density of 0.906g/cm3The melting temperature was 122 ℃.
The preparation method of the polyolefin stretch film in the embodiment is as follows: and co-extruding the heat-seal layer material, the intermediate layer material and the non-heat-seal layer material into a film by using a three-layer co-extrusion casting machine. The material consumption of the heat-sealing layer, the material consumption of the intermediate layer and the material consumption of the non-heat-sealing layer are all 10kg, the temperature of a charging barrel of the casting machine is 180-210 ℃, and the temperature of a die head is 210 ℃.
Example 9
A polyolefin stretch film having a thickness of 160 μm, which is different from that of example 7 in that: the heat seal layers are different in material.
In this example, the heat-sealing layer was made of polyethylene LD 165BW1 obtained from Exxon Mobil chemical engineering, and had a melt index of 0.33g/10min (190 ℃/2.16kg) and a density of 0.922g/cm3The melting temperature was 109 ℃.
The preparation method of the polyolefin stretch film in the embodiment is as follows: and co-extruding the heat-seal layer material, the intermediate layer material and the non-heat-seal layer material into a film by using a three-layer co-extrusion casting machine. The material consumption of the heat-sealing layer, the material consumption of the intermediate layer and the material consumption of the non-heat-sealing layer are all 10kg, the temperature of a charging barrel of the casting machine is 180-210 ℃, and the temperature of a die head is 210 ℃.
Example 10
A polyolefin stretch film having a thickness of 160 μm, which is different from that of example 7 in that: the heat seal layers are different in material.
In this example, the heat-sealing layer was made of polyethylene 2010 from the Dow chemical with a melt index of1.9g/10min (190 ℃/2.16kg), density of 0.92g/cm3The melting temperature was 109 ℃.
The preparation method of the polyolefin stretch film in the embodiment is as follows: and co-extruding the heat-seal layer material, the intermediate layer material and the non-heat-seal layer material into a film by using a three-layer co-extrusion casting machine. The material consumption of the heat-sealing layer, the material consumption of the intermediate layer and the material consumption of the non-heat-sealing layer are all 10kg, the temperature of a charging barrel of the casting machine is 180-210 ℃, and the temperature of a die head is 210 ℃.
Example 11
A polyolefin stretched film was obtained in the same manner as in example 9 except that the film had a thickness of 100 μm.
Example 12
A polyolefin stretched film was obtained in the same manner as in example 9 except that the film had a thickness of 220 μm.
Comparative example
Comparative example 1
A stretched film is a nylon/polyethylene co-extruded film with the thickness of 160 mu m. Wherein the nylon material is nylon BM 17 and is obtained from Ewman, and the polyethylene material is polyethylene 41E762 and is obtained from Dow chemical. The preparation method of the stretched film comprises the following steps: the nylon material and the polyethylene material are co-extruded into a film by using a casting machine. Wherein the using amount of the nylon material is 5kg, the using amount of the polyethylene material is 15kg, the temperature of a charging barrel of the casting machine is 210-240 ℃, and the temperature of a die head is 240 ℃.
Performance test
The puncture strength at-40 ℃ of the stretched films obtained in examples 1 to 12 and comparative example 1 were measured by the method specified in GB/T10004-2008 and the impact strength at-40 ℃ of the stretched films measured by the method specified in GB/T8809-1988, respectively, and the results of the tests are shown in Table 1 below.
TABLE 1 Low temperature puncture and impact resistance test results
Figure BDA0003232218830000071
And (4) analyzing results: by combining the examples 3, 5-10 and 1 and the data in table 1, the nylon/polyethylene co-extruded film in the comparative example 1 has much lower impact resistance and puncture resistance at-40 ℃ than the polyolefin stretched film in the examples under the same thickness, thereby showing that the polyolefin stretched film prepared in the examples of the present application has better low-temperature puncture resistance and impact resistance, and can be applied to the frozen food processing industry for preparing frozen food packaging boxes.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims (10)

1. The polyolefin stretch film is characterized by comprising a non-heat-sealing layer, a middle layer and a heat-sealing layer, wherein the non-heat-sealing layer and the heat-sealing layer are respectively fixed on two sides of the middle layer;
the material of the non-heat sealing layer has a melt index of 0.3-5 g/10min and a density of 0.93-0.94 g/cm3Polyethylene with a melting temperature of 115-130 ℃ or a melt index of 0.3-8 g/10min and a density of 0.89-0.91 g/cm3Polypropylene with a melting temperature of 115-150 ℃;
the intermediate layer material has a melt index of 0.3-5 g/10min and a density of 0.90-0.92 g/cm3Polyethylene with melting temperature of 115-130 ℃;
the material of the heat-sealing layer has a melt index of 0.3-5 g/10min and a density of 0.91-0.925 g/cm3Polyethylene with melting temperature of 100-110 ℃;
the thickness of the polyolefin stretched film is 60-250 mu m.
2. The stretched polyolefin film according to claim 1, wherein the material of the non-heat-seal layer has a melt index of 0.5 to 1.2g/10min and a density of 0.934 to 0.935g/cm3Polyethylene with a melting temperature of 120-130 ℃.
3. Polyolefin according to claim 1The stretched film is characterized in that the material of the intermediate layer is 1.7-1.8 g/10min in melt index and 0.906-0.91 g/cm in density3Polyethylene with a melting temperature of 115-130 ℃.
4. The stretched polyolefin film according to claim 1, wherein the material of the heat seal layer has a melt index of 0.3 to 1.9g/10min and a density of 0.92 to 0.922g/cm3Polyethylene with a melting temperature of 100-110 ℃.
5. The stretched polyolefin film according to claim 1, wherein the material of the non-heat seal layer has a melt index of 1.2g/10min and a density of 0.934g/cm3Polyethylene with a melting temperature of 122 ℃;
the material of the intermediate layer has a melt index of 1.8g/10min and a density of 0.906g/cm3Polyethylene with a melting temperature of 122 ℃;
the material of the heat-sealing layer has a melt index of 1.9g/10min and a density of 0.92g/cm3And polyethylene having a melting temperature of 109 ℃.
6. The stretched polyolefin film according to claim 1, wherein the thickness of the stretched polyolefin film is 100 to 220 μm.
7. The stretched polyolefin film according to claim 6, wherein the thickness of the stretched polyolefin film is 160 μm.
8. The method for producing a stretched polyolefin film according to any one of claims 1 to 7, wherein a heat-seal layer material, an intermediate layer material and a non-heat-seal layer material are co-extruded to form a film by using a three-layer co-extrusion apparatus, wherein the cylinder temperature is 180 to 230 ℃ and the die temperature is 210 to 230 ℃.
9. The method for producing a stretched polyolefin film according to claim 8, wherein the three-layer co-extrusion apparatus is a three-layer co-extrusion casting machine or a three-layer co-extrusion film blowing machine.
10. Use of the stretched polyolefin film according to any one of claims 1 to 7 in the frozen food processing industry.
CN202110990754.6A 2021-08-26 2021-08-26 Polyolefin stretched film, preparation method and application thereof Pending CN113895118A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103465584A (en) * 2013-09-27 2013-12-25 东莞市博晨塑料科技有限公司 Low-temperature freezing multilayer co-extruded film and preparation method thereof
CN104772956A (en) * 2015-02-11 2015-07-15 广东南海星格新型包装材料有限公司 Lightweight packaging film and preparation method thereof
CN111016359A (en) * 2019-11-12 2020-04-17 福建富一锦科技有限公司 PE low-temperature packaging film and preparation method and application thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103465584A (en) * 2013-09-27 2013-12-25 东莞市博晨塑料科技有限公司 Low-temperature freezing multilayer co-extruded film and preparation method thereof
CN104772956A (en) * 2015-02-11 2015-07-15 广东南海星格新型包装材料有限公司 Lightweight packaging film and preparation method thereof
CN111016359A (en) * 2019-11-12 2020-04-17 福建富一锦科技有限公司 PE low-temperature packaging film and preparation method and application thereof

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Application publication date: 20220107