CN105172291A - Polyethylene film with easy straight-line tearing and preparation method for polyethylene film - Google Patents

Polyethylene film with easy straight-line tearing and preparation method for polyethylene film Download PDF

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Publication number
CN105172291A
CN105172291A CN201510561168.4A CN201510561168A CN105172291A CN 105172291 A CN105172291 A CN 105172291A CN 201510561168 A CN201510561168 A CN 201510561168A CN 105172291 A CN105172291 A CN 105172291A
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China
Prior art keywords
intermediate layer
density polyethylene
low density
ldpe
10min
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CN201510561168.4A
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CN105172291B (en
Inventor
汪洋
汪学文
董文辉
吴敏
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Huangshan Novel Co Ltd
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Huangshan Novel Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—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
    • 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
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/08—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the cooling method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
    • B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0008—Electrical discharge treatment, e.g. corona, plasma treatment; wave energy or particle radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/582—Tearability

Abstract

The invention provides a polyethylene film with easy straight-line tearing and a preparation method for the polyethylene film. The film comprises a composite layer, a first intermediate layer, a second intermediate layer, a third intermediate layer, a fourth intermediate layer and a heat-seal layer which are mutually contacted in sequence; the composite layer comprises linear low density polyethylene and low density polyethylene of which the melt index is 2.5 to 4.0g/10min; the first intermediate layer comprises high density polyethylene and the low density polyethylene of which the melt index is 2.5 to 4.0g/10min; the second intermediate layer comprises the high density polyethylene; the third intermediate layer comprises the high density polyethylene and the low density polyethylene of which the melt index is 2.5 to 4.0g/10min; the fourth intermediate layer comprises the linear low density polyethylene and the low density polyethylene of which the melt index is 2.5 to 4.0g/10min; the heat-seal layer comprises metallocene polyethylene and low density polyethylene of which the melt index is 1.5 to 2.5g/10min. The polyethylene film has better straight-line tearing performance.

Description

Polyethylene film of a kind of easy smooth tearing and preparation method thereof
Technical field
The invention belongs to field of packaging material, particularly relate to polyethylene film of a kind of easy smooth tearing and preparation method thereof.
Background technology
Along with the lifting day by day of packing technique, people no longer content just to packaging for foodstuff and simply protect food, extend the necessary functions such as effective period of food quality, and propose more and more higher requirement to the ease for use in the actual use procedure of packaging for foodstuff.Wherein, the tearability of packaging is one of people's utility function comparing concern, and therefore, novel composite membrane of easily tearing just is given birth at once, and is subject to extensive concern gradually.
Ideal, easily to tear the functional composite membrane into target, need to possess following several feature: (1), when consumer opens food pack, should have more satisfactory cracking effect needing the place of cracking; (2) under the prerequisite guaranteeing in-built food security, tear propogation power should be little as much as possible, is convenient to tear simultaneously; (3) effect of paper tear mouth should be possessed during tearing port expansion, and tear line should close to straight line.
Polyethylene film in packaging film is called for short PE film, and the thermoplastic polyester obtained by vinyl polymerization, polyethylene film is colourless, tasteless, nontoxic, and be translucent shape.Polyethylene film has excellent dielectricity and moisture resistivity, can keep flexibility and chemical stability when low temperature.Common polyethylene film, comprises skin, middle level and internal layer, and described internal layer is ionomeric polymer layer, and outer and middle level is polyethylene layer, and described skin, middle level are connected with internal layer coextru-lamination.Common polyethylene film has good chemical resistance, grease resistance, but its smooth tearing is poor.
Summary of the invention
In view of this, the object of the present invention is to provide polyethylene film of a kind of easy smooth tearing and preparation method thereof, polyethylene film provided by the invention has good straight line tearability.
The invention provides a kind of polyethylene film, comprise contact successively composite bed, the first intermediate layer, the second intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and hot sealing layer;
Described composite bed comprises LLDPE and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min;
Described first intermediate layer comprises high density polyethylene (HDPE) and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min;
Described second intermediate layer comprises high density polyethylene (HDPE);
Described 3rd intermediate layer comprises high density polyethylene (HDPE) and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min;
Described 4th intermediate layer comprises LLDPE and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min;
Described hot sealing layer comprises metallocene PE and melt index is the low density polyethylene (LDPE) of 1.5 ~ 2.5g/10min.
Preferably, the Thickness Ratio of described composite bed, the first intermediate layer, the second intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and hot sealing layer is (10 ~ 25): (6 ~ 15): (12 ~ 30): (6 ~ 15): (6 ~ 15): (10 ~ 25).
Preferably, described composite bed neutral line low density polyethylene (LDPE) and melt index are the mass ratio of the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min is 2.5 ~ 3.5:1;
Described first intermediate layer medium high density polyethylene and melt index are the mass ratio of the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min is 0.9 ~ 1.1:1.
Preferably, described 4th intermediate layer neutral line low density polyethylene (LDPE) and melt index are the mass ratio of the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min is 1:2.5 ~ 3.5;
In described hot sealing layer, metallocene PE and melt index are the mass ratio of the low density polyethylene (LDPE) of 1.5 ~ 2.5g/10min is 1.8 ~ 2.2:1.
Preferably, the high density polyethylene (HDPE) that described high density polyethylene (HDPE) comprises high density polyethylene (HDPE) that the trade mark is HTA108, the trade mark is F920A and the trade mark are the high density polyethylene (HDPE) of 3300F.
Preferably, described melt index is that the low density polyethylene (LDPE) of 1.5 ~ 2.5g/10min comprises low density polyethylene (LDPE) that the trade mark is 100AC and/or the trade mark is the low density polyethylene (LDPE) of 2426H.
Preferably, described melt index to be the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min comprises low density polyethylene (LDPE) that the trade mark is L420, the trade mark is TN26 low density polyethylene (LDPE) and the trade mark be in the low density polyethylene (LDPE) of Q281 one or more.
Preferably, the raw material of described hot sealing layer also comprises slipping agent and/or opening agent.
The invention provides the preparation method of polyethylene film described in a kind of technique scheme, comprise the following steps:
By the raw material co-extrusion modling of composite bed, the first intermediate layer, the second intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and hot sealing layer, the tempreature bulb of the composite bed contacted successively, the first intermediate layer, the second intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and hot sealing layer;
Described tempreature bulb is carried out Blown Film and cooling and shaping successively;
The compound aspect of the film after described cooling and shaping is carried out sided corona treatment, obtains polyethylene film.
Preferably, the blowing ratio of described Blown Film is 1.5 ~ 3.
The invention provides a kind of polyethylene film, the composite bed contacted successively, the first intermediate layer, the second intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and hot sealing layer; Described composite bed comprises LLDPE and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min; Described first intermediate layer comprises high density polyethylene (HDPE) and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min; Described second intermediate layer comprises high density polyethylene (HDPE); Described 3rd intermediate layer comprises high density polyethylene (HDPE) and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min; Described 4th intermediate layer comprises LLDPE and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min; Described hot sealing layer comprises metallocene PE and melt index is the low density polyethylene (LDPE) of 1.5 ~ 2.5g/10min.High density polyethylene (HDPE) in polyethylene film provided by the invention can increase the crystallographic orientation degree of film; Melt index is that the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min can play transitional function on crystallization degree, can improve again the combined strength bination of interlayer, finally makes this film have good straight line tearability energy.Experimental result shows: polyethylene film provided by the invention, and when thickness is 70 μm, its horizontal angle tear strength is 9.1MPa, and longitudinal angle tear strength is 7.5MPa.
Accompanying drawing explanation
The structural representation of the polyethylene film that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 is the assay maps that the present invention tests smooth tearing;
Fig. 3 is the schematic diagram that sample of the present invention stretches;
Fig. 4 is the schematic diagram that sample of the present invention is torn.
Detailed description of the invention
The invention provides a kind of polyethylene film, comprise contact successively composite bed, the first intermediate layer, the second intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and hot sealing layer;
Described composite bed comprises LLDPE and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min;
Described first intermediate layer comprises high density polyethylene (HDPE) and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min;
Described second intermediate layer comprises high density polyethylene (HDPE);
Described 3rd intermediate layer comprises high density polyethylene (HDPE) and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min;
Described 4th intermediate layer comprises LLDPE and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min;
Described hot sealing layer comprises metallocene PE and melt index is the low density polyethylene (LDPE) of 1.5 ~ 2.5g/10min.
Polyethylene film provided by the invention has good straight line tearability energy.
Polyethylene film provided by the invention comprises composite bed.In the present invention, the raw material packet of described composite bed draws together the low density polyethylene (LDPE) (LDPE) that LLDPE (LLDPE) and melt index are 2.5 ~ 4.0g/10min; Described composite bed neutral line low density polyethylene (LDPE) and melt index are that the mass ratio of the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min is preferably 2.5 ~ 3.5:1, are more preferably 3:1.In the present invention, described melt index be 2.5 ~ 4.0 the low density polyethylene (LDPE) that low density polyethylene (LDPE) preferably includes low density polyethylene (LDPE) that the trade mark is L420, the trade mark is TN26 and the trade mark be one or more in the low density polyethylene (LDPE) of Q281.In the present invention, the described trade mark is that the low density polyethylene (LDPE) of L420 is not containing any additive, as slipping agent and antiblocking agent, do not have additive to separate out at film surface, thus affect combined strength bination, both had outstanding processability, what had again tightens feature, also there is good heat sealability simultaneously, have good adhesive property with base material; Its melt index is 3.5g/10min; Density is 0.925g/cm 3; Fracture tensile strength is 14.7MPa; Elongation at break is 650%; Fusing point is 107 DEG C; Rigidity is 190MPa.In the present invention, described LLDPE preferably includes the LLDPE that the trade mark is 7042; The LLDPE that the described trade mark is 7042 is raised subsidiary by China Petrochemical Industry and is provided; Its melt index is 2.2g/10min; Density is 0.918g/cm 3; Vicat softening point is 106 DEG C; Fusing point is 120 DEG C.In the present invention, the thickness of described composite bed is preferably 10 ~ 25 μm.
Polyethylene film provided by the invention comprises the first intermediate layer contacted with described composite bed.In the present invention, the raw material in described first intermediate layer comprises high density polyethylene (HDPE) (HDPE) and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min; The raw material medium high density polyethylene in described first intermediate layer and melt index are that the mass ratio of the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min is preferably 0.9 ~ 1.1:1, are more preferably 1:1.In the present invention, in described first intermediate layer melt index to be the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min preferably includes low density polyethylene (LDPE) that the trade mark is L420, the trade mark is TN26 low density polyethylene (LDPE) and the trade mark be in the low density polyethylene (LDPE) of Q281 one or more, be more preferably the low density polyethylene (LDPE) that the trade mark is L420; The high density polyethylene (HDPE) that described high density polyethylene (HDPE) preferably includes high density polyethylene (HDPE) that the trade mark is HTA108, the trade mark is F920A and the trade mark are the high density polyethylene (HDPE) of 3300F.In the present invention, the described trade mark is that the high density polyethylene (HDPE) of HTA108 has higher degree of crystallinity and rigidity, and it is provided by Exxon Mobil Corporation; Its melt index is 0.7g/10min; Density is 0.956g/cm 3; Vicat softening point is 129 DEG C; Fusing point is 135 DEG C.In the present invention, the thickness in described first intermediate layer is preferably 6 ~ 15 μm.
Polyethylene film provided by the invention comprises the second intermediate layer contacted with described first intermediate layer.In the present invention, the raw material in described second intermediate layer comprises high density polyethylene (HDPE); The high density polyethylene (HDPE) that described high density polyethylene (HDPE) preferably includes high density polyethylene (HDPE) that the trade mark is HTA108, the trade mark is F920A and the trade mark are the high density polyethylene (HDPE) of 3300F, are more preferably the high density polyethylene (HDPE) that the trade mark is HTA108.In the present invention, the high density polyethylene (HDPE) that the described trade mark is HTA108 and the trade mark described in technique scheme are that the performance parameter of the high density polyethylene (HDPE) of HTA108 is consistent, do not repeat them here.In the present invention, the thickness in described second intermediate layer is preferably 12 ~ 30 μm.Second intermediate layer is preferably divided into two-layer setting by the present invention, and the Thickness Ratio of every layer is preferably 1:0.9 ~ 1.2; In a particular embodiment of the present invention, the thickness of every layer is all preferably 6 ~ 15 μm.
Polyethylene film provided by the invention comprises the 3rd intermediate layer contacted with described second intermediate layer.In the present invention, described 3rd intermediate layer comprises high density polyethylene (HDPE) and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min; Described 3rd intermediate layer medium high density polyethylene and melt index are that the mass ratio of the low density polyethylene (LDPE) of 2.5 ~ 4.0 is preferably 0.9 ~ 1.1:1, are more preferably 1:1.In the present invention, in described 3rd intermediate layer melt index to be the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min preferably includes low density polyethylene (LDPE) that the trade mark is L420, the trade mark is TN26 low density polyethylene (LDPE) and the trade mark be in the low density polyethylene (LDPE) of Q281 one or more, more preferably comprise the low density polyethylene (LDPE) that the trade mark is L420.In the present invention, the thickness in described 3rd intermediate layer is preferably 6 ~ 15 μm.
Polyethylene film provided by the invention comprises the 4th intermediate layer contacted with described 3rd intermediate layer.In the present invention, the raw material in described 4th intermediate layer comprises metallocene PE (MPE) and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min; In described 4th intermediate layer, melt index is that the LLDPE of 2.5 ~ 4.0g/10min and the mass ratio of LLDPE are preferably 2.5 ~ 3.5:1, is more preferably 3:1.In the present invention, in described 4th intermediate layer melt index to be the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min preferably includes low density polyethylene (LDPE) that the trade mark is L420, the trade mark is TN26 low density polyethylene (LDPE) and the trade mark be in the low density polyethylene (LDPE) of Q281 one or more, more preferably the trade mark is the low density polyethylene (LDPE) of L420.In the present invention, described LLDPE preferably includes the LLDPE that the trade mark is 7042; The LLDPE that the described trade mark is 7042 is raised subsidiary by China Petrochemical Industry and is provided; Its melt index is 2.2g/10min; Density is 0.918g/cm 3; Vicat softening point is 106 DEG C; Fusing point is 120 DEG C.In the present invention, the thickness of described composite bed is preferably 10 ~ 25 μm.In the present invention, the thickness in described 4th intermediate layer is preferably 6 ~ 15 μm.
Polyethylene film provided by the invention comprises the hot sealing layer contacted with described 4th intermediate layer.In the present invention, the raw material of described hot sealing layer comprises metallocene PE and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min; In described hot sealing layer, metallocene PE and melt index are that the mass ratio of the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min is preferably 1:1.8 ~ 2.2, are more preferably 1:2.In the present invention, in described hot sealing layer, low density polyethylene (LDPE) preferably includes low density polyethylene (LDPE) that the trade mark is 2426H and the trade mark is the low density polyethylene (LDPE) of 100AC, and more preferably the trade mark is the low density polyethylene (LDPE) of 100AC.In the present invention, the low density polyethylene (LDPE) that the described trade mark is 100AC is provided by Exxon manufacturer; Its melt index is 2.0g/10min; Density is 0.923g/cm 3; Vicat softening point is 95 DEG C; Fusing point is 109 DEG C; Hot strength: MD/TD is 22/27MPa; Elongation at break: MD/TD is 350%/580%.In the present invention, in described hot sealing layer, metallocene PE preferably includes the metallocene PE that the trade mark is SP1520; The described trade mark is that the metallocene PE of SP1520 has low-temperature heat-sealing and high optical property, is provided by Mitsui Chemicals, Inc.; Its melt index is 1.9g/10min; Density is 0.914g/cm 3; Vicat softening point is 96 DEG C; Fusing point is 116 DEG C; Hot strength: MD/TD is 60/70MPa; Elongation at break: MD/TD is 3560%/690%.In a particular embodiment of the present invention, the blended combination of the 100AC (LDPE) of described hot sealing layer Ai Kesen company and the SP1520 (MPE) of Mitsui both can improve the processing characteristics of hot sealing layer, had again the performance of low-temperature heat-sealing.In the present invention, the thickness of described hot sealing layer is preferably 10 ~ 25 μm.
In the present invention, the raw material of described hot sealing layer preferably also comprises slipping agent and/or opening agent.The kind of the present invention to described slipping agent and opening agent does not have special restriction with source, adopts slipping agent well known to those skilled in the art and opening agent.In the present invention, described slipping agent and/or opening agent play booster action to flexibility (adaptability) of operation.In the present invention, described slipping agent preferably includes the slipping agent that the trade mark is ESQ-4; In described slipping agent and hot sealing layer, the mass ratio of metallocene PE is preferably 0.07 ~ 0.1:1, is more preferably 0.08 ~ 0.09:1.In the present invention, described opening agent preferably includes the opening agent that the trade mark is EAZ-10; In described opening agent and hot sealing layer, the mass ratio of metallocene PE is preferably 0.07 ~ 0.1:1, is more preferably 0.08 ~ 0.09:1.
In the present invention, the Thickness Ratio of described composite bed, the first intermediate layer, the second intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and hot sealing layer is preferably (10 ~ 25): (6 ~ 15): (12 ~ 30): (6 ~ 15): (6 ~ 15): (10 ~ 25), are more preferably (13 ~ 20): (8 ~ 13): (14 ~ 26): (8 ~ 12): (8 ~ 12): (13 ~ 20).In a particular embodiment of the present invention, the thickness of described composite bed, the first intermediate layer, the second intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and hot sealing layer is respectively 13 μm, 8 μm, 14.5 μm, 8 μm, 12 μm and 13 μm.
In the present invention specifically implements, add L420 particle in the raw material in described composite bed, the first intermediate layer, the 3rd intermediate layer and the 4th intermediate layer and both can improve the processing characteristics of raising son 7042 (LLDPE) and HTA108 (HDPE), the combined strength bination of coextruded film interlayer can be strengthened again.In the present invention specifically implements, high density polyethylene (HDPE) in described first intermediate layer, the second intermediate layer, the 3rd intermediate layer and the 4th intermediate layer raw material Tensile effect molecule in blown film process produces the directional orientation along blown film direction, and molecular orientation and interlamellar strength be the longitudinal basis of easily tearing of co-extrusion PE film just.
The source of the present invention to the raw material of described composite bed, the first intermediate layer, the second intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and hot sealing layer does not have special restriction, adopts product well known to those skilled in the art, all can buy from market and obtain.
See Fig. 1, the structural representation of the polyethylene film that Fig. 1 provides for the embodiment of the present invention, wherein, 11 is hot sealing layer for composite bed, 12 be the first intermediate layer, 13 be the 5th intermediate layer, 14 be the 6th intermediate layer, 15 be the 3rd intermediate layer, 16 is the 4th intermediate layer and 17.
In the present invention, the Thickness Ratio of described composite bed, the first intermediate layer, the 5th intermediate layer, the 6th intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and hot sealing layer is preferably (10 ~ 25): (6 ~ 15): (6 ~ 15): (6 ~ 15): (6 ~ 15): (6 ~ 15): (10 ~ 25), are more preferably (13 ~ 20): (8 ~ 13): (8 ~ 13): (6 ~ 13): (8 ~ 12): (8 ~ 12): (13 ~ 20).In a particular embodiment of the present invention, the thickness of described composite bed, the first intermediate layer, the 5th intermediate layer, the 6th intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and hot sealing layer is respectively 13 μm, 8 μm, 8.3 μm, 6.2 μm, 8 μm, 12 μm and 13 μm.
Present invention also offers the preparation method of the polyethylene film described in a kind of technique scheme, comprise the following steps:
By the raw material co-extrusion modling of composite bed, the first intermediate layer, the second intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and hot sealing layer, the tempreature bulb of the composite bed contacted successively, the first intermediate layer, the second intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and hot sealing layer;
Described tempreature bulb is carried out Blown Film and cooling and shaping successively;
The compound aspect of the film after described cooling and shaping is carried out sided corona treatment, obtains polyethylene film.
In the present invention, kind and the consumption of the raw material of the kind of described composite bed, the first intermediate layer, the second intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and the raw material of hot sealing layer and consumption and composite bed described in technique scheme, the first intermediate layer, the second intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and hot sealing layer are consistent, do not repeat them here.
The present invention preferably adopts screw extruder well known to those skilled in the art to carry out extruding of above-mentioned raw materials.In the present invention, described screw extruder comprises 6 barrels; Each barrel comprises slot type machine barrel, machine barrel 1 district, machine barrel 2 district, machine barrel 3 district, machine barrel 4 district, draping district and flange.The heating-up temperature of slot type machine barrel is preferably 50 DEG C ~ 60 DEG C, the heating-up temperature in machine barrel 1 district is preferably 185 DEG C ~ 190 DEG C, the heating-up temperature in machine barrel 2 district is preferably 185 DEG C ~ 190 DEG C, the heating-up temperature in machine barrel 3 district is preferably 190 DEG C ~ 195 DEG C, the heating-up temperature in machine barrel 4 district is preferably 190 DEG C ~ 195 DEG C, the heating-up temperature in draping district is preferably 190 DEG C ~ 195 DEG C, and the heating-up temperature of flange is preferably 190 DEG C ~ 195 DEG C.Those skilled in the art can carry out the adjustment of coextrusion parameter according to the performance of used screw extruder model and target polyethylene film.In the present invention, the temperature arranging die head when extruding is preferably 190 DEG C ~ 205 DEG C; Extrusion capacity is preferably 429 ± 50kg/h; Hauling speed is preferably 34 ± 5m/min; Contact roller tension force is preferably 55 ± 10N; Outer cold EAT is preferably 21 DEG C ± 5 DEG C; Interior cold EAT is preferably 10 DEG C ± 5 DEG C; The convolution time is preferably 45min ± 3min.The present invention carries out Blown Film and cooling and shaping successively to described tempreature bulb.In the present invention, the blowing of described Blown Film is than being preferably 1.5 ~ 3.Those skilled in the art can carry out the adjustment of blowing parameter according to the blow moulding equipment model used and the performance of target polyethylene film.
After blowing obtains film, the compound aspect of the present invention to the film after described cooling and shaping carries out sided corona treatment, obtains polyethylene film.Those skilled in the art can carry out the adjustment of corona parameter according to the corona unit type used and the performance of target polyethylene film.In the present invention, the power of described corona is preferably 9.5 ~ 10.5KW.
In one embodiment of the invention, described second intermediate layer can be divided into two-layer preparation, and being provided separately by the second intermediate layer is the 5th intermediate layer and the 6th intermediate layer; Above-mentioned polyethylene film comprise contact successively composite bed, the first intermediate layer, the 5th intermediate layer, the 6th intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and hot sealing layer.
In the present invention, described hot sealing layer, the first intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and hot sealing layer are consistent with the hot sealing layer described in technique scheme, the first intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and hot sealing layer, do not repeat them here.
In the present invention, the raw material in described 5th intermediate layer and the 6th intermediate layer is the high density polyethylene (HDPE) described in technique scheme; The Thickness Ratio in described 5th intermediate layer and the 6th intermediate layer is preferably 1:0.9 ~ 1.2; In a particular embodiment of the present invention, the thickness of every layer is all preferably 6 ~ 15 μm.The preparation method of the present invention to above-mentioned polyethylene film preferably includes following steps:
By the raw material co-extrusion modling of composite bed, the first intermediate layer, the 5th intermediate layer, the 6th intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and hot sealing layer, the tempreature bulb of the composite bed contacted successively, the first intermediate layer, the 5th intermediate layer, the 6th intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and hot sealing layer;
Described tempreature bulb is carried out Blown Film and cooling and shaping successively;
The compound aspect of the film after described cooling and shaping is carried out sided corona treatment, obtains polyethylene film.
The present invention preferably adopts screw extruder well known to those skilled in the art to carry out composite bed, the first intermediate layer, the 5th intermediate layer, the 6th intermediate layer, the 3rd intermediate layer, the extruding of the 4th intermediate layer and hot sealing layer raw material.In the present invention, described screw extruder comprises 7 barrels; Each barrel comprises slot type machine barrel, machine barrel 1 district, machine barrel 2 district, machine barrel 3 district, machine barrel 4 district, draping district and flange.The heating-up temperature of slot type machine barrel is preferably 50 DEG C ~ 60 DEG C, the heating-up temperature in machine barrel 1 district is preferably 185 DEG C ~ 190 DEG C, the heating-up temperature in machine barrel 2 district is preferably 185 DEG C ~ 190 DEG C, the heating-up temperature in machine barrel 3 district is preferably 190 DEG C ~ 195 DEG C, the heating-up temperature in machine barrel 4 district is preferably 190 DEG C ~ 195 DEG C, the heating-up temperature in draping district is preferably 190 DEG C ~ 195 DEG C, and the heating-up temperature of flange is preferably 190 DEG C ~ 195 DEG C.Those skilled in the art can carry out the adjustment of coextrusion parameter according to the performance of used screw extruder model and target polyethylene film.In the present invention, the temperature arranging die head when extruding is preferably 190 DEG C ~ 205 DEG C; Extrusion capacity is preferably 429 ± 50kg/h; Hauling speed is preferably 34 ± 5m/min; Contact roller tension force is preferably 55 ± 10N; Outer cold EAT is preferably 21 DEG C ± 5 DEG C; Interior cold EAT is preferably 10 DEG C ± 5 DEG C; The convolution time is preferably 45min ± 3min.The present invention carries out Blown Film and cooling and shaping successively to described tempreature bulb.In the present invention, the blowing of described Blown Film is than being preferably 1.5 ~ 3.Those skilled in the art can carry out the adjustment of blowing parameter according to the blow moulding equipment model used and the performance of target polyethylene film.
After blowing obtains film, the compound aspect of the present invention to the film after described cooling and shaping carries out sided corona treatment, obtains polyethylene film.Those skilled in the art can carry out the adjustment of corona parameter according to the corona unit type used and the performance of target polyethylene film.
The present invention carries out the test of smooth tearing to polyethylene film, and method of testing is as follows:
Fig. 2 is the assay maps that the present invention tests smooth tearing, gets the rectangular sample film shown in Fig. 2, cuts 2 otch, this section is cut into three parts in sample one end.With the two panels of XLW-100E type micro-control electronic tension tester (Materials Testing Instrument factory provides by Guangzhou) backward haulage sample both sides and between the end of a slice, draw the two panels of both sides, it is made to separate with middle a slice, simulate the speed in people Kaifeng by the speed pulled open, be generally set as 1000 ± 50mm/min; Sample stretches as shown in Figure 3, and Fig. 3 is the schematic diagram that sample of the present invention stretches.After stretching is torn, measure the effect numerical value of the sample film as shown in Figure 4 torn apart, Fig. 4 is the schematic diagram that sample of the present invention is torn.If film is separated into three rectangles, so the effect of its smooth tearing is best; If Splitting is centre slowly become rectangular.Attenuate, at this moment measure and leave width rectangular between beginning breach 50mm place, using this width value as the index of smooth tearing.Result shows: polyethylene film provided by the invention has good straight line tearability energy.
The invention provides a kind of polyethylene film, the composite bed contacted successively, the first intermediate layer, the second intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and hot sealing layer; Described composite bed comprises LLDPE and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min; Described first intermediate layer comprises high density polyethylene (HDPE) and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min; Described second intermediate layer comprises high density polyethylene (HDPE); Described 3rd intermediate layer comprises high density polyethylene (HDPE) and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min; Described 4th intermediate layer comprises LLDPE and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min; Described hot sealing layer comprises metallocene PE and melt index is the low density polyethylene (LDPE) of 1.5 ~ 2.5g/10min.High density polyethylene (HDPE) in polyethylene film provided by the invention can increase the crystallographic orientation degree of film; Melt index is that the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min can play transitional function on crystallization degree, can improve again the combined strength bination of interlayer, finally makes this film have good straight line tearability energy.Experimental result shows: polyethylene film provided by the invention, and when thickness is 70 μm, its horizontal angle tear strength is 9.1MPa, and longitudinal angle tear strength is 7.5MPa.
In order to further illustrate the present invention, below in conjunction with embodiment, a kind of polyethylene film provided by the invention and preparation method thereof being described in detail, but they can not being interpreted as limiting the scope of the present invention.
Embodiment 1
In seven barrels of extruder machine, add the raw material of composite bed, the raw material in the first intermediate layer, the raw material in the 5th intermediate layer, the raw material in the 6th intermediate layer, the raw material in the 3rd intermediate layer, the raw material in the 4th intermediate layer and the raw material of hot sealing layer respectively, each composition of raw materials is as follows:
Composite bed: the 75kg trade mark be 7042 LLDPE LLDPE and the 25kg trade mark be the low density polyethylene of L420;
First intermediate layer: the 50kg trade mark is the low density polyethylene of L420 and the 50kg trade mark is the high density polyethylene of HTA108;
5th intermediate layer: the 100kg trade mark is the high density polyethylene of HTA108;
6th intermediate layer: the 100kg trade mark is the high density polyethylene of HTA108;
3rd intermediate layer: the 50kg trade mark is the low density polyethylene of L420 and the 50kg trade mark is the high density polyethylene (HDPE) of HT108;
4th intermediate layer: the 25kg trade mark to be the low density polyethylene of L420 and the 75kg trade mark be 7042 LLDPE LLDPE;
Hot sealing layer: the trade mark that 50kg dispatches from the factory Exxon is the low density polyethylene of 100AC, the trade mark of 25kg is the metallocene PE of SP1520, the trade mark of 2kg is the opening agent of EAZ-10 and the trade mark of 2.2kg is the slipping agent of ESQ-4;
The heating-up temperature arranging the slot type machine barrel of each barrel is 50 DEG C ~ 60 DEG C, the heating-up temperature in machine barrel 1 district is 185 DEG C ~ 190 DEG C, the heating-up temperature in machine barrel 2 district is 185 DEG C ~ 190 DEG C, the heating-up temperature in machine barrel 3 district is 190 DEG C ~ 195 DEG C, the heating-up temperature in machine barrel 4 district is 190 DEG C ~ 195 DEG C, the heating-up temperature in draping district is 190 DEG C ~ 195 DEG C, and the heating-up temperature of flange is 190 DEG C ~ 195 DEG C; The temperature arranging die head is 190 DEG C ~ 205 DEG C; Extrusion capacity is 429 ± 50kg/h; Hauling speed is 34 ± 5m/min; Contact roller tension force is 55 ± 10N; Outer cold EAT is 21 DEG C ± 5 DEG C; Interior cold EAT is 10 DEG C ± 5 DEG C; The convolution time is 45min ± 3min; Raw particles in above-mentioned seven barrels is through screw extruder melting and form tempreature bulb, compressed air is gone out from extruder die head center after being stretched by tempreature bulb, tempreature bulb blown film is blown into blister film, inflation is 1.8, simultaneously by blister film through vane cooling air cooling and shaping, obtained polyethylene film;
Described polyethylene film comprises composite bed, the first intermediate layer, the 5th intermediate layer, the 6th intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and hot sealing layer successively, the thickness of composite bed is 13 μm, the thickness in the first intermediate layer is 8 μm, the thickness in the 5th intermediate layer is 8.3 μm, the thickness in the 6th intermediate layer is 6.2 μm, the thickness in the 3rd intermediate layer is 8 μm, and the thickness in the 4th intermediate layer is 12 μm, and the thickness of hot sealing layer is 13 μm.
The PE film of common material comprises composite bed, intermediate layer and hot sealing layer; Wherein, the raw material of composite bed comprise the 12.5kg trade mark be 2420 low density polyethylene (LDPE) and the 87.5kg trade mark be 7042 LLDPE LLDPE, the thickness of composite bed is 15 μm; The raw material in intermediate layer comprises high density polyethylene that the 25kg trade mark is low density polyethylene (LDPE), the 25kg trade mark to be LLDPE LLDPE, 25kg trade mark raising son 7042 the be HTA108 of 2420 and the 0.2kg trade mark is the processing aid of 100991-K, and the thickness in intermediate layer is 40 μm; The metallocene PE that the metallocene PE that the raw material of described hot sealing layer comprises low density polyethylene (LDPE) that the 25kg trade mark is Exxon 100AC, the 25kg trade mark is 1520, the 25kg trade mark are 5401, the 1kg trade mark be 10090 slipping agent and the 1kg trade mark be the opening agent of AB-20LD, the thickness of described hot sealing layer is 15 μm.
The present invention carries out lancinating test to polyethylene film prepared by common material PE film and embodiment 1, and its straight line tearability energy test result is in table 1, and table 1 is that the straight line of polyethylene film prepared by common PE film and embodiment 1 easily tears test result:
The straight line of polyethylene film prepared by table 1 common PE film and embodiment 1 easily tears test result
As can be seen from Table 1, the polyethylene film that prepared by the embodiment of the present invention 1 has good straight line tearability energy.
Embodiment 2
In seven barrels of extruder machine, add the raw material of composite bed, the raw material in the first intermediate layer, the raw material in the 5th intermediate layer, the raw material in the 6th intermediate layer, the raw material in the 3rd intermediate layer, the raw material in the 4th intermediate layer and the raw material of hot sealing layer respectively, each composition of raw materials is as follows:
Composite bed: the 75kg trade mark is the LLDPE LLDPE of 7042 and the trade mark of 25kg oil of SPC production is the low density polyethylene of Q281;
First intermediate layer: the low density polyethylene of the Q281 that oil of SPC is produced and the 50kg trade mark are the high density polyethylene of HTA108;
5th intermediate layer: the 100kg trade mark is the high density polyethylene (HDPE) of HTA108;
6th intermediate layer: the 100kg trade mark is the high density polyethylene (HDPE) of HTA108;
3rd intermediate layer: the trade mark that 50kg oil of SPC is produced is the low density polyethylene of Q281 and the 50kg trade mark is the high density polyethylene (HDPE) of HT108;
4th intermediate layer: the trade mark that 25kg oil of SPC is produced is the low density polyethylene of Q281 and the 75kg trade mark is the LLDPE of 7042;
Hot sealing layer: the trade mark that 50kg CNOOC shell is dispatched from the factory is the low density polyethylene of 2426H, the trade mark of 25kg is the metallocene PE of SP1520, the trade mark of 2kg is the opening agent of EAZ-10 and the trade mark of 2.2kg is the slipping agent of ESQ-4;
The heating-up temperature arranging the slot type machine barrel of each barrel is 50 DEG C ~ 60 DEG C, the heating-up temperature in machine barrel 1 district is 185 DEG C ~ 190 DEG C, the heating-up temperature in machine barrel 2 district is 185 DEG C ~ 190 DEG C, the heating-up temperature in machine barrel 3 district is 190 DEG C ~ 195 DEG C, the heating-up temperature in machine barrel 4 district is 190 DEG C ~ 195 DEG C, the heating-up temperature in draping district is 190 DEG C ~ 195 DEG C, and the heating-up temperature of flange is 190 DEG C ~ 195 DEG C; The temperature arranging die head is 190 DEG C ~ 205 DEG C; Extrusion capacity is 429 ± 50kg/h; Hauling speed is 34 ± 5m/min; Contact roller tension force is 55 ± 10N; Outer cold EAT is 21 DEG C ± 5 DEG C; Interior cold EAT is 10 DEG C ± 5 DEG C; The convolution time is 45min ± 3min; Raw particles in above-mentioned seven barrels is through screw extruder melting and form tempreature bulb, compressed air is gone out from extruder die head center after being stretched by tempreature bulb, tempreature bulb blown film is blown into blister film, inflation is 2.0, simultaneously by blister film through vane cooling air cooling and shaping, obtained polyethylene film;
Described polyethylene film comprises composite bed, the first intermediate layer, the 5th intermediate layer, the 6th intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and hot sealing layer successively, the thickness of composite bed is 13 μm, the thickness in the first intermediate layer is 8 μm, the thickness in the 5th intermediate layer is 8.3 μm, the thickness in the 6th intermediate layer is 6.2 μm, the thickness in the 3rd intermediate layer is 8 μm, and the thickness in the 4th intermediate layer is 12 μm, and the thickness of hot sealing layer is 13 μm; Its straight line tearability energy test result is in table 2, and table 2 is that the straight line of polyethylene film prepared by common PE film and embodiment 2 easily tears test result:
The straight line of polyethylene film prepared by table 2 common PE film and embodiment 2 easily tears test result
As can be seen from Table 2, when polyethylene film thickness prepared by the embodiment of the present invention 2 is 70 μm, its horizontal angle tear strength is 8.8MPa, and longitudinal angle tear strength is 7.8MPa, has good straight line tearability energy.
As seen from the above embodiment, a kind of polyethylene film provided by the invention, the composite bed contacted successively, the first intermediate layer, the second intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and hot sealing layer; Described composite bed comprises LLDPE and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min; Described first intermediate layer comprises high density polyethylene (HDPE) and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min; Described second intermediate layer comprises high density polyethylene (HDPE); Described 3rd intermediate layer comprises high density polyethylene (HDPE) and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min; Described 4th intermediate layer comprises LLDPE and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min; Described hot sealing layer comprises metallocene PE and melt index is the low density polyethylene (LDPE) of 1.5 ~ 2.5g/10min.High density polyethylene (HDPE) in polyethylene film provided by the invention can increase the crystallographic orientation degree of film; Melt index is that the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min can play transitional function on crystallization degree, can improve again the combined strength bination of interlayer, finally makes this film have good straight line tearability energy.Experimental result shows: polyethylene film provided by the invention, and when thickness is 70 μm, its horizontal angle tear strength is 9.1MPa, and longitudinal angle tear strength is 7.5MPa.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (10)

1. a polyethylene film, comprise contact successively composite bed, the first intermediate layer, the second intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and hot sealing layer;
Described composite bed comprises LLDPE and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min;
Described first intermediate layer comprises high density polyethylene (HDPE) and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min;
Described second intermediate layer comprises high density polyethylene (HDPE);
Described 3rd intermediate layer comprises high density polyethylene (HDPE) and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min;
Described 4th intermediate layer comprises LLDPE and melt index is the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min;
Described hot sealing layer comprises metallocene PE and melt index is the low density polyethylene (LDPE) of 1.5 ~ 2.5g/10min.
2. polyethylene film according to claim 1, it is characterized in that, the Thickness Ratio of described composite bed, the first intermediate layer, the second intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and hot sealing layer is (10 ~ 25): (6 ~ 15): (12 ~ 30): (6 ~ 15): (6 ~ 15): (10 ~ 25).
3. polyethylene film according to claim 1, is characterized in that, described composite bed neutral line low density polyethylene (LDPE) and melt index are the mass ratio of the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min is 2.5 ~ 3.5:1;
Described first intermediate layer medium high density polyethylene and melt index are the mass ratio of the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min is 0.9 ~ 1.1:1.
4. polyethylene film according to claim 1, is characterized in that, described 4th intermediate layer neutral line low density polyethylene (LDPE) and melt index are the mass ratio of the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min is 1:2.5 ~ 3.5;
In described hot sealing layer, metallocene PE and melt index are the mass ratio of the low density polyethylene (LDPE) of 1.5 ~ 2.5g/10min is 1:1.8 ~ 2.2.
5. polyethylene film according to claim 1, is characterized in that, the high density polyethylene (HDPE) that described high density polyethylene (HDPE) comprises high density polyethylene (HDPE) that the trade mark is HTA108, the trade mark is F920A and the trade mark are the high density polyethylene (HDPE) of 3300F.
6. polyethylene film according to claim 1, is characterized in that, described melt index is that the low density polyethylene (LDPE) of 1.5 ~ 2.5g/10min comprises low density polyethylene (LDPE) that the trade mark is 100AC and/or the trade mark is the low density polyethylene (LDPE) of 2426H.
7. polyethylene film according to claim 1, it is characterized in that, described melt index to be the low density polyethylene (LDPE) of 2.5 ~ 4.0g/10min comprises low density polyethylene (LDPE) that the trade mark is L420, the trade mark is TN26 low density polyethylene (LDPE) and the trade mark be in the low density polyethylene (LDPE) of Q281 one or more.
8. polyethylene film according to claim 1, is characterized in that, the raw material of described hot sealing layer also comprises slipping agent and/or opening agent.
9. a preparation method for polyethylene film described in claim 1 ~ 8 any one, comprises the following steps:
By the raw material co-extrusion modling of composite bed, the first intermediate layer, the second intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and hot sealing layer, the tempreature bulb of the composite bed contacted successively, the first intermediate layer, the second intermediate layer, the 3rd intermediate layer, the 4th intermediate layer and hot sealing layer;
Described tempreature bulb is carried out Blown Film and cooling and shaping successively;
The compound aspect of the film after described cooling and shaping is carried out sided corona treatment, obtains polyethylene film.
10. preparation method according to claim 9, is characterized in that, the blowing ratio of described Blown Film is 1.5 ~ 3.
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CN108943949A (en) * 2018-07-27 2018-12-07 黄山永新股份有限公司 PE film and preparation method thereof is easily opened at a kind of heat-sealing interface
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