CN112848585B - PE stretch winding film and preparation process thereof - Google Patents

PE stretch winding film and preparation process thereof Download PDF

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Publication number
CN112848585B
CN112848585B CN201911176606.XA CN201911176606A CN112848585B CN 112848585 B CN112848585 B CN 112848585B CN 201911176606 A CN201911176606 A CN 201911176606A CN 112848585 B CN112848585 B CN 112848585B
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parts
layer material
density polyethylene
stretch
metallocene
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CN112848585A (en
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唐彬彬
黄阳
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Ningbo Yuanxiang New Material Co ltd
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Ningbo Yuanxiang New 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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/003—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; 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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/24—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length
    • 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
    • B29C48/16—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
    • 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
    • B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
    • B29C69/02—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore of moulding techniques only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
    • 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
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • 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
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • 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
    • B32B2307/54—Yield strength; Tensile strength
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/582—Tearability
    • B32B2307/5825—Tear resistant
    • 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
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • 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
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • B32B2323/046—LDPE, i.e. low density polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for
    • 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
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)

Abstract

The invention discloses a PE stretch winding film, which is formed by co-extrusion of three layers of materials of an outer layer, a middle layer and an inner layer; the outer layer material comprises the following components in parts by weight: 60-80 parts of linear low-density polyethylene, 3-8 parts of linear medium-density polyethylene and 6-12 parts of metallocene; the middle layer material comprises the following components in parts by weight: 55-70 parts of linear low-density polyethylene, 2-6 parts of linear medium-density polyethylene and 5-10 parts of metallocene; the inner layer material comprises the following components in percentage by mass: 50-70 parts of linear low density polyethylene, 2-8 parts of metallocene and 1-5 parts of tackifier. The PE stretch-wrapping film has the advantages of higher uniformity and flatness, high transparency and excellent puncture resistance and tear resistance.

Description

PE stretch winding film and preparation process thereof
Technical Field
The invention relates to the technical field of packaging materials, in particular to a PE stretch wrapping film and a preparation process thereof.
Background
The PE stretch wrapping film has the advantages of strong tensile property, large elongation, good self-adhesion, puncture resistance, tearing resistance and the like, can be used for manually wrapping films, also can be used for machine wrapping films, and is widely used for packaging chemical products, electronic product boxes, ceramic products, electromechanical equipment and the like.
The winding film has the following characteristics: (1) unitization: unitization is one of the biggest characteristics of wrapping film packaging, products are compactly and fixedly bundled into a unit by virtue of ultra-strong wrapping force and retractility of the film, scattered small pieces are integrated, and the products are free from loosening and separation even under adverse environments; (2) primary protection: the primary protection provides the surface protection of the product, and forms a light and protective appearance around the product, thereby achieving the purposes of dust prevention, oil prevention, moisture prevention, water prevention and theft prevention; (3) cost savings: the wrapping film is utilized to package the product, so that the use cost can be effectively reduced, the cost is only about 15% of that of the original wood box package, about 35% of that of the heat shrinkage film and about 50% of that of the paper box package, and meanwhile, the labor intensity of workers can be reduced, and the packaging efficiency and the packaging grade can be improved.
At present, the PE stretch wrapping film is widely applied to industries such as industrial enterprises, food processing, logistics bags and the like, and plays roles in fixing, waterproofing, dust prevention and protecting wrapped objects for packaged products. However, the conventional PE stretch-wound film has poor uniformity, large thickness error, low longitudinal elongation, low yield point, poor transverse tear strength, poor puncture resistance and tear resistance in the practical use process, and cannot meet the requirement of large-scale application.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a PE stretch wrapping film which has higher uniformity and flatness, high transparency and excellent puncture resistance and tear resistance. In addition, the invention also provides a preparation process of the PE stretch-wrapping film.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in a first aspect of the present invention, there is provided a PE stretch wrap film co-extruded from three layers of material, an outer layer, a middle layer and an inner layer;
the outer layer material comprises the following components in parts by weight: 60-80 parts of Linear Low Density Polyethylene (LLDPE), 3-8 parts of Linear Medium Density Polyethylene (LMDPE) and 6-12 parts of Metallocene (MPE);
the middle layer material comprises the following components in parts by weight: 55-70 parts of Linear Low Density Polyethylene (LLDPE), 1-3 parts of Linear Medium Density Polyethylene (LMDPE) and 5-10 parts of Metallocene (MPE);
the inner layer material comprises the following components in percentage by mass: 50-70 parts of Linear Low Density Polyethylene (LLDPE), 2-8 parts of Metallocene (MPE) and 1-5 parts of tackifier.
In the formula, the Linear Low Density Polyethylene (LLDPE) has the advantages of higher softening temperature and melting temperature, high strength, good toughness, high rigidity, heat resistance, good cold resistance and the like, and also has the properties of good environmental stress cracking resistance, impact resistance, tear resistance and the like, and the Linear Low Density Polyethylene (LLDPE) is used as a main material of a PE stretch-wrapping film, and metallocene is added into the PE stretch-wrapping film, so that the metallocene is a high-tacticity polymer, the molecular weight distribution is very narrow, the physical properties of the polymer can be accurately controlled, and the addition of the metallocene can obviously improve the tensile strength, the puncture resistance and the tear resistance of the PE stretch-wrapping film; the tackifier is also added into the inner layer material, so that the winding film has a certain viscosity effect and has a better packaging and protecting effect on goods; the Linear Medium Density Polyethylene (LMDPE) is added into the outer layer material and the middle layer material, so that the density of the outer layer material and the inner layer material can be increased, the orientation degree of the outer layer material and the inner layer material can be improved, the transparency of the winding film can be increased, the comprehensive performance of the film layer can be improved, the friction coefficient of the non-adhesive layer of the winding film can be reduced, and adhesion between packaged goods can be avoided.
Preferably, the outer layer material, the middle layer material and the inner layer material further comprise Low Density Polyethylene (LDPE), and the mass ratio of Metallocene (MPE) to Low Density Polyethylene (LDPE) in each layer material is 1: (0.1-0.5). The addition of metallocene can obviously improve the elongation, puncture resistance and tear resistance of PE stretch-wound film, but because the metallocene has narrow molecular weight distribution and narrow processing range, the processing conditions are difficult to control, a certain amount of Low Density Polyethylene (LDPE) is added into the metallocene to reduce the melt viscosity, the processing process is easy to regulate and control, and the flatness of the wound film is improved.
Preferably, the tackifier is Polyisobutylene (PIB) or ultra low density polyethylene (VLDPE). The good viscosity can enable the packaging film layer and the packaging film layer outside the goods to be adhered together, so that the goods are firm, polyisobutylene (PIB) or ultra-low density polyethylene (VLDPE) is selected as the tackifier, the tackifier can migrate to the inner layer at a high speed after the winding film is produced, a good viscosity effect can be achieved, and the viscosity is stable. The adhesive of the winding film prepared by the tackifier is affected by temperature, the adhesive is strong when the temperature is higher than 30 ℃, and the adhesive is poor when the temperature is lower than 15 ℃, so that the storage temperature of the winding film is 15-25 ℃.
Preferably, the mass ratio of the outer layer material, the middle layer material and the inner layer material is 1: (2-5): (0.5-1.5).
Preferably, the PE stretch wrap film has a thickness of 23-28 μm.
In a second aspect of the present invention, there is provided a process for preparing the PE stretch-wrap film described above, comprising the steps of:
s1, respectively adding all components in an outer layer material, a middle layer material and an inner layer material into three stirring containers according to corresponding proportions, and stirring and mixing uniformly;
s2, respectively extruding the mixture obtained in the three stirring containers in the step S1 at high temperature through a screw extruder to obtain outer-layer, middle-layer and inner-layer plastic particles;
s3, respectively adding the outer layer, the middle layer and the inner layer of plastic particles obtained in the step S2 into corresponding chambers in a casting machine, and casting to form a film, wherein the casting temperature is 250-280 ℃, the temperature of a casting cooling roller is 20-30 ℃, and then rolling and packaging to obtain the PE stretch winding film, and the rolling tension is not more than 10Kg.
Preferably, in the step S2, the heating temperature in the screw extruder is 190-220 ℃.
In the preparation process, the temperature of the casting cooling roller has higher influence on the performance of the winding film, when the temperature of the casting cooling roller is increased, the yield strength of the winding film is increased, but the rest performance is reduced, and the temperature of the casting cooling roller is controlled to be 20-30 ℃ so as to ensure the comprehensive performance of the winding film in all aspects; the winding tension can influence the flatness and the winding tightness of the winding film, the winding tension is overlarge, stress can remain in the winding film, the performances such as the elongation rate and the like of the winding film are reduced, the film breakage phenomenon is easy to occur, and the winding tension is controlled to be not more than 10Kg.
Compared with the prior art, the invention has the following beneficial effects:
the invention selects Linear Low Density Polyethylene (LLDPE) as the main material of PE stretch winding film, which has higher softening temperature and melting temperature, and also has the advantages of high strength, good toughness, high rigidity, heat resistance, good cold resistance and the like, and also has good environmental stress cracking resistance, impact resistance, tearing resistance and the like; the addition of metallocene can significantly improve the tensile strength, puncture resistance and tear resistance of the PE stretch-wrap film; the tackifier is also added into the inner layer material, so that the winding film has a certain viscosity effect and has a better packaging and protecting effect on goods; and a proper amount of Linear Medium Density Polyethylene (LMDPE) is added into the outer layer material and the middle layer material, so that the density of the outer layer material and the inner layer material can be increased, the orientation degree of the outer layer material and the inner layer material can be improved, the transparency of the winding film can be increased, the comprehensive performance of the film layer can be improved, in addition, the friction coefficient of the non-adhesive layer of the winding film can be reduced by adding the linear medium density polyethylene, and adhesion between packaged goods can be avoided.
The PE stretch winding film has reasonable formula of each layer of material, adopts a three-layer coextrusion process, strictly controls the casting temperature and the winding tension, and has the advantages of uniform thickness of the prepared winding film, high transparency, excellent tensile strength and puncture resistance.
Drawings
The invention will be described in further detail with reference to the drawings and the specific embodiments.
FIG. 1 is a flow chart of a process for preparing a PE stretch wrap film according to the present invention.
Detailed Description
Example 1
The PE stretch wrapping film in the embodiment is formed by co-extrusion of three layers of materials of an outer layer, a middle layer and an inner layer, wherein the mass ratio of the outer layer material to the middle layer material to the inner layer material is 1:3: the thickness of the PE stretch wrap film was 24. Mu.m.
The outer layer material comprises the following components in parts by weight: 68 parts of Linear Low Density Polyethylene (LLDPE), 4 parts of Linear Medium Density Polyethylene (LMDPE) and 8 parts of Metallocene (MPE);
the middle layer material comprises the following components in parts by weight: 60 parts of Linear Low Density Polyethylene (LLDPE), 3 parts of Linear Medium Density Polyethylene (LMDPE) and 7 parts of Metallocene (MPE);
the inner layer material comprises the following components in percentage by mass: 56 parts of Linear Low Density Polyethylene (LLDPE), 2 parts of Metallocene (MPE) and 3 parts of tackifier.
Wherein the tackifier is Polyisobutylene (PIB).
The preparation process of the PE stretch-wrap film in this embodiment, as shown in FIG. 1, comprises the following steps:
s1, respectively adding all components in an outer layer material, a middle layer material and an inner layer material into three stirring containers according to corresponding proportions, and stirring and mixing uniformly;
s2, respectively extruding the mixture obtained in the three stirring containers in the step S1 at high temperature through a screw extruder to obtain outer-layer, middle-layer and inner-layer plastic particles; wherein the heating temperature in the screw extruder is 190-220 ℃;
s3, respectively adding the outer layer, the middle layer and the inner layer of plastic particles obtained in the step S2 into corresponding chambers in a casting machine, and casting to form a film, wherein the casting temperature is 250-280 ℃, the temperature of a casting cooling roller is 20-30 ℃, and then rolling and packaging to obtain the PE stretch winding film, and the rolling tension is not more than 10Kg.
Example 2
The PE stretch wrapping film in the embodiment is formed by co-extrusion of three layers of materials of an outer layer, a middle layer and an inner layer, wherein the mass ratio of the outer layer material to the middle layer material to the inner layer material is 1:2:0.5, the PE stretch wrap film thickness was 26. Mu.m.
The outer layer material comprises the following components in parts by weight: 60 parts of Linear Low Density Polyethylene (LLDPE), 3 parts of Linear Medium Density Polyethylene (LMDPE) and 6 parts of Metallocene (MPE);
the middle layer material comprises the following components in parts by weight: 55 parts of Linear Low Density Polyethylene (LLDPE), 2 parts of Linear Medium Density Polyethylene (LMDPE) and 5 parts of Metallocene (MPE);
the inner layer material comprises the following components in percentage by mass: 50 parts of Linear Low Density Polyethylene (LLDPE), 5 parts of Metallocene (MPE) and 5 parts of tackifier.
Wherein the outer layer material, the middle layer material and the inner layer material also comprise Low Density Polyethylene (LDPE), and the mass ratio of Metallocene (MPE) to the Low Density Polyethylene (LDPE) in each layer material is 1:0.2.
wherein the tackifier is ultra low density polyethylene (VLDPE).
The process for preparing the PE stretch wrap film in this example can be referred to in example 1.
Example 3
The PE stretch wrapping film in the embodiment is formed by co-extrusion of three layers of materials of an outer layer, a middle layer and an inner layer, wherein the mass ratio of the outer layer material to the middle layer material to the inner layer material is 1:5:1.5 the PE stretch wrap film had a thickness of 23. Mu.m.
The outer layer material comprises the following components in parts by weight: 74 parts of Linear Low Density Polyethylene (LLDPE), 8 parts of Linear Medium Density Polyethylene (LMDPE) and 12 parts of Metallocene (MPE);
the middle layer material comprises the following components in parts by weight: 65 parts of Linear Low Density Polyethylene (LLDPE), 1 part of Linear Medium Density Polyethylene (LMDPE) and 10 parts of Metallocene (MPE);
the inner layer material comprises the following components in percentage by mass: 70 parts of Linear Low Density Polyethylene (LLDPE), 6 parts of Metallocene (MPE) and 1 part of tackifier.
Wherein the outer layer material, the middle layer material and the inner layer material also comprise Low Density Polyethylene (LDPE), and the mass ratio of Metallocene (MPE) to the Low Density Polyethylene (LDPE) in each layer material is 1:0.1.
wherein the tackifier is Polyisobutylene (PIB).
The process for preparing the PE stretch wrap film in this example can be referred to in example 1.
Example 4
The PE stretch wrapping film in the embodiment is formed by co-extrusion of three layers of materials of an outer layer, a middle layer and an inner layer, wherein the mass ratio of the outer layer material to the middle layer material to the inner layer material is 1:3:0.8, the PE stretch wrap film had a thickness of 28. Mu.m.
The outer layer material comprises the following components in parts by weight: 80 parts of Linear Low Density Polyethylene (LLDPE), 6 parts of Linear Medium Density Polyethylene (LMDPE) and 8 parts of Metallocene (MPE);
the middle layer material comprises the following components in parts by weight: 70 parts of Linear Low Density Polyethylene (LLDPE), 2 parts of Linear Medium Density Polyethylene (LMDPE) and 6 parts of Metallocene (MPE);
the inner layer material comprises the following components in percentage by mass: 68 parts of Linear Low Density Polyethylene (LLDPE), 8 parts of Metallocene (MPE) and 3 parts of tackifier.
Wherein the outer layer material, the middle layer material and the inner layer material also comprise Low Density Polyethylene (LDPE), and the mass ratio of Metallocene (MPE) to the Low Density Polyethylene (LDPE) in each layer material is 1:0.5.
wherein the tackifier is ultra low density polyethylene (VLDPE).
The process for preparing the PE stretch wrap film in this example can be referred to in example 1.
Comparative example 1
Comparative example 1 is a comparative test of example 2, which differs in that: in comparative example 1, no metallocene was added to the materials of the outer layer, the middle layer and the inner layer, and the other formulation ratios and preparation process flows were the same as in example 2.
Comparative example 2
Comparative example 2 is a comparative test of example 2, which differs from the comparative test in that: in comparative example 1, no linear medium density polyethylene was added to the outer layer and middle layer materials, and the other formulation ratios and preparation process flows were the same as in example 2.
Test examples
The PE stretch-wrap films prepared in examples 1 to 4, comparative example 1 and comparative example 2 were tested for tensile strength and elongation at break according to GB/T1040.3-2006, and the specific test results are shown in Table 1.
TABLE 1
Tensile Strength (MPa) Elongation at break (%)
Example 1 14.2 387
Example 2 15.6 392
Example 3 14.5 384
Example 4 14.1 379
Comparative example 1 8.6 245
Comparative example 2 9.7 264
From the test results in table 1, it is apparent that the PE stretch-wrap films prepared in examples 1 to 4 have excellent mechanical properties, and have excellent tensile strength and puncture resistance. The metallocene is added into the formula, so that the tensile strength, puncture resistance and tear resistance of the PE stretch-wound film can be obviously improved; and proper amount of Linear Medium Density Polyethylene (LMDPE) is added into the outer layer material and the middle layer material, so that the comprehensive performance of the film layer can be improved.
The PE stretch winding film has reasonable formula of each layer of material, adopts a three-layer coextrusion process, strictly controls the casting temperature and the winding tension, and has the advantages of uniform thickness of the prepared winding film, high transparency, excellent tensile strength and puncture resistance.
The foregoing description of the invention has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the invention pertains, based on the idea of the invention.

Claims (6)

1. The PE stretch winding film is characterized by being formed by co-extrusion of three layers of materials of an outer layer, a middle layer and an inner layer;
the outer layer material comprises the following components in parts by weight: 60-80 parts of linear low-density polyethylene, 3-8 parts of linear medium-density polyethylene and 6-12 parts of metallocene;
the middle layer material comprises the following components in parts by weight: 55-70 parts of linear low-density polyethylene, 1-3 parts of linear medium-density polyethylene and 5-10 parts of metallocene;
the inner layer material comprises the following components in percentage by mass: 50-70 parts of linear low density polyethylene, 2-8 parts of metallocene and 1-5 parts of tackifier;
the preparation process comprises the following steps:
s1, respectively adding all components in an outer layer material, a middle layer material and an inner layer material into three stirring containers according to corresponding proportions, and stirring and mixing uniformly;
s2, respectively extruding the mixture obtained in the three stirring containers in the step S1 at high temperature through a screw extruder to obtain outer-layer, middle-layer and inner-layer plastic particles;
s3, respectively adding the outer layer, the middle layer and the inner layer of plastic particles obtained in the step S2 into corresponding chambers in a casting machine, and casting to form a film, wherein the casting temperature is 250-280 ℃, the temperature of a casting cooling roller is 20-30 ℃, and then rolling and packaging to obtain the PE stretch winding film, and the rolling tension is not more than 10Kg.
2. The PE stretch-wrap film according to claim 1, wherein the outer layer material, the middle layer material and the inner layer material further comprise a low density polyethylene, wherein the mass ratio of metallocene to low density polyethylene in each layer material is 1: (0.1-0.5).
3. A PE stretch wrap film according to claim 1 or 2, wherein the tackifier is polyisobutylene or ultra low density polyethylene.
4. A PE stretch-wrap film according to claim 3, wherein the mass ratio of the outer layer material, the middle layer material and the inner layer material is 1: (2-5): (0.5-1.5).
5. The PE stretch-wrap film according to claim 1, wherein the PE stretch-wrap film has a thickness of 23-28 μm.
6. The PE stretch-wrap film according to claim 1, wherein in the step S2, the heating temperature in the screw extruder is 190-220 ℃.
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CN115923290B (en) * 2022-12-13 2023-09-19 青岛开美克橡塑有限公司 Stretching winding film for machine and preparation method thereof
CN116787891B (en) * 2023-06-21 2024-03-29 青岛泰博聚合标签有限公司 Stretch wrap film and method of making the same
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