CN103029388B - Three-layer coextrusion heavy packaging membrane and fabrication method thereof - Google Patents
Three-layer coextrusion heavy packaging membrane and fabrication method thereof Download PDFInfo
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- CN103029388B CN103029388B CN201210577472.4A CN201210577472A CN103029388B CN 103029388 B CN103029388 B CN 103029388B CN 201210577472 A CN201210577472 A CN 201210577472A CN 103029388 B CN103029388 B CN 103029388B
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- 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
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
- B29C48/914—Cooling of flat articles, e.g. using specially adapted supporting means cooling drums
-
- 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
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
-
- 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
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92514—Pressure
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
- B29C2948/9259—Angular velocity
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92885—Screw or gear
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92895—Barrel or housing
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Laminated Bodies (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to the technical field of heavy packaging membranes, in particular to a three-layer coextrusion heavy packaging membrane and a fabrication method thereof. An inner layer of the three-layer coextrusion heavy packaging membrane contains LLDPE (linear low density polyethylene) and m-LLDPE (metallocene-linear low density polyethylene); a middle layer thereof contains m-LLDPE, LLDPE, MDPE (medium density polyethylene), EVA (ethylene-vinyl acetate) and a color masterbatch; and an outer layer thereof contains LLDPE, LDPE (low density polyethylene) and m-LLDPE. The fabrication method of the three-layer coextrusion heavy packaging membrane adopts the proportioning, and a product is fabricated on a certain technological condition. Compared with the prior art, the membrane has the characteristics that the membrane is excellent in mechanical property and good in deflexion; a skin-friction coefficient of the membrane is moderate; and a heat-seal window can reach 180 minus/plus 50 DEG C. The membrane can fully meet the requirement of normal use of downstream packaging, is particularly suitable for high-speed FFS (form-fill-seal) packaging, and has a good economic benefit and a social benefit.
Description
Technical field
The present invention relates to multilayer packing membrane technical field, particularly relate to a kind of three-layer co-extruded multilayer packing membrane and preparation method thereof.
Background technology
FFS three-layer co-extruded multilayer packing membrane industry was flourish in recent years, panoramic multilayer packing membrane continues to bring out, in order to ensure that multilayer packing membrane has higher mechanical strength and heat seal strength, multilayer packing membrane selects the metallocene linear-low density polyethylene resin (m-LLDP) of hexene or octene copolymer usually, high-density polyethylene resin (HDPE) mixture of hexene or the linear low density polyethylene resin (LLDPE) of octene copolymer, the ldpe resin (LDPE) of homopolymerization and butene obtains.Existing multilayer packing membrane not only raw material of filling a prescription is many, and the multilayer packing membrane intensity of preparation is undesirable.Also the linear low density polyethylene resin (m-LLDPE) selecting a large amount of hexene or octene copolymer is had, the ldpe resin (LDPE) of homopolymerization and high-density polyethylene resin (HDPE) mixture of butene obtain, but obtained multilayer packing membrane is due to the higher LLDPE of intensity, m-LLDPE and the larger HDPE of rigidity requires harsh to equipment processing ability, be difficult to extensive use produce, and solution conventional at present adds the working ability that LDPE improves overall raw material, but adding of LDPE greatly reduces multilayer packing membrane intensity, reduce the economic worth of product.
Chinese invention application (application number is 201010515776.9) discloses one and heavily packs and use FFS film, and it has three-decker, its ectomesoderm: middle level: the Thickness Ratio of internal layer is between 1:1:1 to 1:3:1; Outer containing two kinds of m-LLDPE, itself and LDPE proportioning by a certain percentage, also can add a certain amount of processing aid, antistatic additive etc.; 1 kind of m-LLDPE is contained in middle level, itself and HDPE, LDPE, titanium white proportioning by a certain percentage; Internal layer contains 2 kinds of m-LLDPE, and itself and LDPE proportioning by a certain percentage, also can add a certain amount of processing aid, opening agent etc.; M-LLDPE involved by this patent application is hervene copolymer m-LLDPE.The LDPE amount that this heavy packaging FFS film uses is more, affects the bulk strength of film, and meanwhile, HDPE is harsh to equipment requirement, needs to buy subscription specific equipment, and the production cost and the producting process difficulty that not only increase multilayer packing membrane are large, are difficult to promote the use of.
Summary of the invention
The object of the invention is to avoid weak point of the prior art and the three-layer co-extruded multilayer packing membrane that a kind of excellent performance is provided.
Object of the present invention is achieved through the following technical solutions.
A kind of three-layer co-extruded multilayer packing membrane, comprise amplexiform co-extrusion successively internal layer, middle level and skin, internal layer is made up of the component of following percentage by weight:
LLDPE 20 ~ 80%
Metallocene linear-low density polyethylene 20 ~ 80%,
Middle level is made up of the component of following percentage by weight:
LLDPE 20 ~ 50%
Metallocene linear-low density polyethylene 20 ~ 50%
Ethylene-vinyl acetate copolymer 3 ~ 15%
Medium density polyethylene 20 ~ 50%
Masterbatch 3 ~ 10%,
Skin comprises the component of following percentage by weight:
LLDPE 15 ~ 60%
Metallocene linear-low density polyethylene 20 ~ 60%
Low density polyethylene (LDPE) 15 ~ 40%.
Wherein, skin also comprises 0.5 ~ 2% antistatic additive.
Preferably, a kind of three-layer co-extruded multilayer packing membrane, internal layer is made up of the component of following percentage by weight:
LLDPE 40 ~ 60%
Metallocene linear-low density polyethylene 40 ~ 60%,
Middle level is made up of the component of following percentage by weight:
LLDPE 25 ~ 40%
Metallocene linear-low density polyethylene 25 ~ 40%
Ethylene-vinyl acetate copolymer 5 ~ 10%
Medium density polyethylene 20 ~ 40%
Masterbatch 4 ~ 6%,
Skin is made up of the component of following percentage by weight:
LLDPE 20 ~ 40%
Metallocene linear-low density polyethylene 30 ~ 50%
Low density polyethylene (LDPE) 15 ~ 25%
Antistatic additive 0.8 ~ 1.5%.
Preferably, a kind of three-layer co-extruded multilayer packing membrane, internal layer is made up of the component of following percentage by weight:
LLDPE 50%
Metallocene linear-low density polyethylene 50%,
Middle level is made up of the component of following percentage by weight:
LLDPE 30%
Metallocene linear-low density polyethylene 37%
Ethylene-vinyl acetate copolymer 3%
Medium density polyethylene 25%
Masterbatch 5%,
Skin is made up of the component of following percentage by weight:
LLDPE 20%
Metallocene linear-low density polyethylene 50%
Low density polyethylene (LDPE) 29%
Antistatic additive 1%.
Another is preferred, a kind of three-layer co-extruded multilayer packing membrane, and internal layer is made up of the component of following percentage by weight:
LLDPE 60%
Metallocene linear-low density polyethylene 40%,
Middle level is made up of the component of following percentage by weight:
LLDPE 30%
Metallocene linear-low density polyethylene 30%
Ethylene-vinyl acetate copolymer 5%
Medium density polyethylene 30%
Masterbatch 5%,
Skin is made up of the component of following percentage by weight:
LLDPE 30%
Metallocene linear-low density polyethylene 50%
Low density polyethylene (LDPE) 19.5%
Antistatic additive 0.5%.
Preferably, a kind of three-layer co-extruded multilayer packing membrane, internal layer is made up of the component of following percentage by weight:
LLDPE 40%
Metallocene linear-low density polyethylene 60%,
Middle level is made up of the component of following percentage by weight:
LLDPE 20%
Metallocene linear-low density polyethylene 30%
Ethylene-vinyl acetate copolymer 6%
Medium density polyethylene 40%
Masterbatch 4%,
Skin is made up of the component of following percentage by weight:
LLDPE 25%
Metallocene linear-low density polyethylene 60%
Low density polyethylene (LDPE) 14.5%
Antistatic additive 0.5%.
Above-mentioned LLDPE is nontoxic, tasteless, the milky white granules of odorless, it is compared with LDPE, there is higher softening temperature and melt temperature, there is the advantages such as intensity is large, good toughness, rigidity are large, heat-resisting, cold resistance is good, also there is good environmental stress crack resistance, the performance such as impact strength, tear-resistant intensity, and can acid and alkali resistance, organic solvent etc.And m-LLDPE can improve the mechanical performance of multilayer packing membrane effectively, reduce osmotic bursting phenomenon, and there is excellent heat sealability when sealing bag bag, the blended main component as multilayer packing membrane of the present invention of m-LLDPE and LLDPE, the multilayer packing membrane utilizing LLDPE distinctive linear structure that production is obtained not only has the desirable performance of m-LLDPE and LLDPE, and reduce the production and processing technology requirement of m-LLDPE, can extensively large-scale industrial production preparation.
The superiority of above-mentioned EVA in elasticity, flexibility, glossiness and gas permeability etc. clearly, in addition, the environmental stress crack resistance of EVA is high, to filler by capacitive large, middle level of the present invention is blended with other composition in the proper ratio by EVA, makes three-layer co-extruded multilayer packing membrane of the present invention have higher light transmission, the better advantage such as antifogging performance and heat insulating ability relative to conventional art.
In the present invention, the thickness of internal layer, the thickness in middle level and outer field thickness proportion scope are 2:1:2 ~ 1:3:1.
In the present invention, the thickness of internal layer, the thickness in middle level and outer field thickness proportion scope are 2:1:2 ~ 1:1:1.
In the present invention, a kind of three-layer co-extruded multilayer packing membrane, LLDPE is the LLDPE of the one or more kinds of monomer copolymerizations in butylene, hexene and octene, and LLDPE melting means is 0.2 ~ 2.5g/10min, and density is 0.9 ~ 0.93 g/cm
3;
Metallocene linear-low density polyethylene is the metallocene linear-low density polyethylene of the one or more kinds of monomer copolymerizations in metallocene catalyst catalyzing butene, hexene and octene, LLDPE melting means is 0.5 ~ 2.5g/10min, and density is 0.9 ~ 0.93 g/cm
3;
Medium density polyethylene is the medium density polyethylene of the one or more kinds of monomer copolymerizations in butylene, hexene and octene, and medium density polyethylene melting means is 0.1 ~ 1.5g/10min, and density is 0.93 ~ 0.94 g/cm
3;
Low density polyethylene (LDPE) is homopolymerization low density polyethylene (LDPE), low density polyethylene (LDPE) melting means 0.2 ~ 2g/10min, density 0.91 ~ 0.95g/cm
3;
The vinyl acetate content of ethylene-vinyl acetate copolymer is 5 ~ 20%, melting means 0.2 ~ 3g/10min, density 0.91 ~ 0.95g/cm
3.
Invent another object and be to provide that a kind of production technology is simple, cost is low, the three-layer co-extruded multilayer packing membrane preparation method of excellent performance, it is implemented by the following technical programs.
A preparation method for three-layer co-extruded multilayer packing membrane, comprises the following steps,
The first step: prepare each layer film:
(1) preparation of internal layer membrane raw material:
The first single screw extrusion machine is sent into mixing after LLDPE and metallocene linear-low density polyethylene being mixed according to above-mentioned formula ratio, the extruder temperature of the first single screw extrusion machine is 150 ~ 190 DEG C, the head temperature of the first single screw extrusion machine is 170 ~ 200 DEG C, the rotating speed of screw rod 40 ~ 100 revs/min, extrudes tonnage 30 ~ 50Mpa;
(2) preparation of middle level film raw material:
LLDPE, metallocene linear-low density polyethylene, ethylene-vinyl acetate copolymer, medium density polyethylene and Masterbatch is mixing according to sending into the second single screw extrusion machine after above-mentioned formula ratio mixing, the extruder temperature of the second single screw extrusion machine is 150 ~ 190 DEG C, the head temperature of the second single screw extrusion machine is 170 ~ 200 DEG C, screw speed 40 ~ 100 revs/min, extrudes tonnage 30 ~ 50Mpa;
(3) preparation of outer membrane raw material:
LLDPE, metallocene linear-low density polyethylene and low density polyethylene (LDPE) are mixed according to above-mentioned formula ratio, do not add as required or add appropriate antistatic additive, again mixture is sent into the 3rd single screw extrusion machine mixing, the extruder temperature of the 3rd single screw extrusion machine is 150 ~ 190 DEG C, the head temperature of the 3rd single screw extrusion machine is 170 ~ 200 DEG C, screw speed 40 ~ 100 revs/min, extrudes tonnage 30 ~ 50Mpa;
Second step: extrusion molding:
(1) flow-like internal layer membrane raw material, middle level film raw material and outer membrane raw material are delivered to simultaneously three-layer co-extruded go out the head of machine, three kinds of fluidised form raw materials three-layer co-extruded go out to merge in machine extrude, form film bubble, film bubble is cooling forming under inside and outside temperature is the cooling air of 10 ~ 20 DEG C;
(2) shaping film bubble is by steady bubble frame stable bubble
(3) again by the diameter of film bubble measuring instrument 360 degree of wheel measuring film bubbles and the distribution of thickness, and feed back to the adjustment that regulating system completes bubble thickness, then film bubble enters swivel mount, carry out the rotation of positive and negative circumference and realize the positive and negative circumference twisting of film bubble, be distributed to whole film bubble uniformly circumferentially to make bubble thickness;
(4) film bubble adjusted through above-mentioned steps (3) is pressed into through collapser and sends into draw-gear after flat and carry out traction and stretch, and obtaining draw ratio is 5 ~ 10 film bars;
3rd step: cooling film article:
(1) the film bar leaving upper draw-gear being continued through successively 6 diameters is that the chill roll of 70 ~ 110 millimeters carries out first time cooling, logical running water in chill roll;
(2) film bar is continued through Air flow cabinet and carry out second time cooling, chilling temperature is 15 ~ 20 DEG C;
(3) film bar being continued again continue through successively 2 diameters is that the chill roll of 170 ~ 230 millimeters carries out third time cooling, logical cooling water in chill roll, and coolant water temperature is set as 5 ~ 10 DEG C;
4th step: rolling film article:
By the film obtained after the 3rd step cools by batching after marginal mode correction instrument and static eliminator, namely obtain clean and tidy semi-finished product film volume;
5th step: printing cutting:
The semi-finished product film volume 4th step obtained delivers to that printing machine carries out unreeling, high-frequency spark process, printing, heated-air drying, cold air drying, displacement, embossing, after insert edge and splitting winding, obtain three-layer co-extruded multilayer packing membrane.
Wherein, the screw diameter of the first single screw extrusion machine is 45 ~ 65mm, and draw ratio is 30:1;
The screw diameter of the second single screw extrusion machine is 55 ~ 75mm, and draw ratio is 30:1;
The screw diameter of the 3rd single screw extrusion machine is 45 ~ 65mm, and draw ratio is 30:1.
Beneficial effect of the present invention: the internal layer of three-layer co-extruded multilayer packing membrane of the present invention adopts LLDPE and metallocene linear-low density polyethylene mixture, compared with traditional handicraft, the present invention provide not only higher heat sealability and mechanical strength, and because of raw material type few, the mixing uniformity of raw material is high, properties of product average temperature, heat-sealing temperature is more stable.Middle level adopts metallocene linear-low density polyethylene, LLDPE, ethylene-vinyl acetate copolymer, medium density polyethylene, color masterbatch mixture in proportion, because medium density polyethylene density is between low density polyethylene (LDPE) and high density polyethylene (HDPE), therefore three-layer co-extruded multilayer packing membrane of the present invention has good deflection and toughness balance, the existence of ethylene-vinyl acetate copolymer simultaneously makes the suppleness of this three-layer co-extruded multilayer packing membrane higher, and lower temperature resistance is stronger.Outer employing LLDPE, low density polyethylene (LDPE), metallocene linear-low density polyethylene and antistatic additive mixture in proportion, significantly eliminates the electrostatic of product, reduces dust and adheres to, and keeps clean and tidy.The present invention's metallocene linear-low density polyethylene, medium density polyethylene, ethylene-vinyl acetate copolymer and LLDPE replace traditional multilayer packing membrane and use poly-high density polyethylene (HDPE), LLDPE and metallocene linear-low density polyethylene are as body material, under suitable process conditions, not only improve the intensity of product product, toughness, heat seal strength and deflection, and properties of product all have stable, possess the climatic adaptation performance of height, good toughness can be presented at low temperature environment.
Three-layer co-extruded multilayer packing membrane preparation method of the present invention uses the raw material of suitable proportioning to prepare internal layer, middle level and skin respectively, the three-layer co-extruded multilayer packing membrane excellent performance prepared, and this three-layer co-extruded multilayer packing membrane preparation method production technology is simple, device requirement is not harsh, cost is low, efficiency is high.
Detailed description of the invention
The invention will be further described with the following Examples.
embodiment 1.
A kind of three-layer co-extruded multilayer packing membrane, comprise amplexiform co-extrusion successively internal layer, middle level and skin, internal layer is made up of the component of following percentage by weight:
LLDPE 20 ~ 80%
Metallocene linear-low density polyethylene 20 ~ 80%,
Middle level is made up of the component of following percentage by weight:
LLDPE 20 ~ 50%
Metallocene linear-low density polyethylene 20 ~ 50%
Ethylene-vinyl acetate copolymer 3 ~ 15%
Medium density polyethylene 20 ~ 50%
Masterbatch 3 ~ 10%,
Skin comprises the component of following percentage by weight:
LLDPE 15 ~ 60%
Metallocene linear-low density polyethylene 20 ~ 60%
Low density polyethylene (LDPE) 15 ~ 40%.
The above-mentioned raw materials of the present embodiment all obtains from buying on the market.
The internal layer of three-layer co-extruded multilayer packing membrane of the present invention adopts LLDPE and m-LLDPE mixture, and compared with traditional handicraft, the present invention provide not only higher heat sealability and mechanical strength, and because of raw material type few, the mixing uniformity of raw material is high, and properties of product average temperature, heat-sealing temperature is more stable.Middle level adopts m-LLDPE, LLDPE, EVA, MDPE, color masterbatch mixture in proportion, because MDPE density is between LDPE and HDPE, therefore three-layer co-extruded multilayer packing membrane of the present invention has good deflection and toughness balance, the existence of EVA simultaneously makes the suppleness of this three-layer co-extruded multilayer packing membrane higher, and lower temperature resistance is stronger.Outer employing LLDPE, LDPE, m-LLDPE and antistatic additive mixture in proportion, significantly eliminate the electrostatic of product, reduces dust and adhere to, and keeps clean and tidy.The present invention m-LLDPE, MDPE, EVA and LLDPE replace traditional multilayer packing membrane and use poly-HDPE, LLDPE and m-LLDPE is as body material, under suitable process conditions, not only improve the intensity of product product, toughness, heat seal strength and deflection, and properties of product all have stable, possess the climatic adaptation performance of height, good toughness can be presented at low temperature environment.
The thickness of the present embodiment internal layer: the thickness in middle level: the ratio of outer field thickness is limited between 2:1:2 ~ 1:3:1, compared with prior art, Thickness Ratio within the scope of this, has the following advantages: (1) requires to reduce to film blowing device, effectively can improve the production equipment adaptability of formula.Under equal production volume, the screw extruder rotating speed that the one deck improving thickness proportion adopts must raise, also can strengthen the loss of screw rod, too high Thickness Ratio regular meeting affects screw rod service life, the thickness proportion that the present embodiment is three layers reasonably can alleviate the production load of screw extruder, can conservative control screw extruder rotating speed more at different times and under keeping the early stage of output, obviously extend screw rod service life, thus improve economic worth.(2) for prevent the impurity in raw material or plastify bad raw material, burnt material enters blown-film die runner, conventional blown film unit all arranges filtering area at head and screw extruder junction, and filtering area lays the screen pack of certain filtration order number.Along be subject to impurity or plastify bad raw material, the filter mesh of burnt material blocking increases gradually, screen pack bears pressure and can improve, and causes the change of screw extruder tonnage.If screen pack pressure is more than a threshold value, gently then affects raw material plasticizing quality, affect properties of product, heavy then cause screen pack to break, impurity or plastify bad raw material, burnt material directly enters flow channel, film blowing device is damaged.Therefore when the pressure of screen pack is elevated to certain numerical value, inflation film manufacturing machine is shut down and is changed screen pack, thus causes the production cycle to shorten and produce the debugging waste product opened, shut down.The thickness proportion of the three-layer co-extruded multilayer packing membrane three layers of the present embodiment is moderate, screw speed can be reduced, reduce unit interval feedstock transportation amount, thus reduction screen pack bears pressure, reach the object of the waste product that extends manufacture cycle, reduces, other two-layer thickness proportion of corresponding raising then can keep same output, but reduces replacing.
The three-layer co-extruded multilayer packing membrane preparation method of the present embodiment, comprises the following steps,
The first step: prepare each layer film
(1) preparation of internal layer membrane raw material
LLDPE and m-LLDPE is mixing according to sending into the first single screw extrusion machine after above-mentioned formula ratio mixing, the screw diameter of the first single screw extrusion machine is 45 ~ 65mm, draw ratio is 30:1, this extruder temperature is 150 ~ 190 DEG C, the head temperature of the first single screw extrusion machine is 170 ~ 200 DEG C, the rotating speed of screw rod 40 ~ 100 revs/min, extrudes tonnage 30 ~ 50Mpa.
(2) preparation of middle level film raw material
The second single screw extrusion machine is sent into mixing after LLDPE, m-LLDPE, EVA, MDPE and Masterbatch being mixed according to above-mentioned formula ratio, the screw diameter of the second single screw extrusion machine is 55 ~ 75mm, draw ratio is 30:1, this extruder temperature is 150 ~ 190 DEG C, the head temperature of the second single screw extrusion machine is 170 ~ 200 DEG C, screw speed 40 ~ 100 revs/min, extrudes tonnage 30 ~ 50Mpa.
(3) preparation of outer membrane raw material
LLDPE, m-LLDPE and LDPE are added antistatic additive according to after above-mentioned formula ratio mixing, again mixture is sent into the 3rd single screw extrusion machine mixing, the screw diameter of the 3rd single screw extrusion machine is 45 ~ 65mm, draw ratio is 30:1, this extruder temperature is 150 ~ 190 DEG C, the head temperature of the 3rd single screw extrusion machine is 170 ~ 200 DEG C, and screw speed 40 ~ 100 revs/min, extrudes tonnage 30 ~ 50Mpa.
Second step: extrusion molding
(1) flow-like internal layer membrane raw material, middle level film raw material and outer membrane raw material are delivered to simultaneously three-layer co-extruded go out the head of machine, three kinds of fluidised form raw materials three-layer co-extruded go out to merge in machine extrude, form film bubble, film bubble is cooling forming under inside and outside temperature is the cooling air of 10 ~ 20 DEG C;
(2) shaping film bubble is by steady bubble frame stable bubble;
(3) again by the diameter of film bubble measuring instrument 360 degree of wheel measuring film bubbles and the distribution of thickness, and feed back to the adjustment that regulating system completes bubble thickness, then film bubble enters swivel mount, carry out the rotation of positive and negative circumference and realize the positive and negative circumference twisting of film bubble, be distributed to whole film bubble uniformly circumferentially to make bubble thickness;
(4) film bubble adjusted through above-mentioned steps (3) is pressed into through collapser and sends into draw-gear after flat and carry out traction and stretch, and obtaining draw ratio is 5 ~ 10 film bars.
The present invention use three-layer co-extruded go out machine be prior art, at this in detail its structure and principle are not described in detail.
3rd step: cooling film article
(1) the film bar leaving upper draw-gear being continued through successively 6 diameters is that the chill roll of 70 ~ 110 millimeters carries out first time cooling, logical running water in chill roll;
(2) film bar is continued through Air flow cabinet and carry out second time cooling, chilling temperature is 15 ~ 20 DEG C;
(3) film bar being continued again continue through successively 2 diameters is that the chill roll of 170 ~ 230 millimeters carries out third time cooling, and logical cooling water in chill roll, coolant water temperature is set as 5 ~ 10 DEG C.
The three-layer co-extruded multilayer packing membrane preparation method of the present embodiment adopts the cooling step by step of three special road refrigerating work procedures, and better than one traditional quenching process cooling effect, properties of product are more excellent.After the mould of tubulose becomes the film bar of flat, film bar temperature is higher, and individual sites is even higher than 80 DEG C, and the molecule of film bar is still in prepattern state.If directly chilling easily makes high-temperature area degree of crystallinity higher than other regions, cause the appearance larger difference of thickness, mechanical performance and heat sealability, and easily because chilling causes the contraction of film bar inconsistent, affect product size and deformation of products warpage.After this three-layer co-extruded multilayer packing membrane preparation method adopts the mode cooled step by step, close to freezing mask but natural way, thickness, mechanical performance and heat sealability substantially there is no difference, product size is stablized, and without situation appearance such as film distortion warpages.。
4th step: rolling film article
By the film obtained after the 3rd step cools by batching after marginal mode correction instrument and static eliminator, namely obtain clean and tidy semi-finished product film volume;
5th step: printing cutting
The semi-finished product film volume 4th step obtained delivers to that printing machine carries out unreeling, high-frequency spark process, printing, heated-air drying, cold air drying, displacement, embossing, after insert edge and splitting winding, obtain three-layer co-extruded multilayer packing membrane.
The three-layer co-extruded multilayer packing membrane excellent performance that the three-layer co-extruded multilayer packing membrane preparation method of the present embodiment prepares, and this three-layer co-extruded multilayer packing membrane preparation method production technology is simple, device requirement is not harsh, cost is low, efficiency is high.
embodiment 2.
A kind of three-layer co-extruded multilayer packing membrane of the present embodiment and the difference of embodiment 1 are, the component of this kind of three-layer co-extruded multilayer packing membrane is as follows:
Internal layer is made up of the component of following percentage by weight:
LLDPE 40 ~ 60%
Metallocene linear-low density polyethylene 40 ~ 60%,
Middle level is made up of the component of following percentage by weight:
LLDPE 25 ~ 40%
Metallocene linear-low density polyethylene 25 ~ 40%
Ethylene-vinyl acetate copolymer 5 ~ 10%
Medium density polyethylene 20 ~ 40%
Masterbatch 4 ~ 6%,
Skin is made up of the component of following percentage by weight:
LLDPE 20 ~ 40%
Metallocene linear-low density polyethylene 30 ~ 50%
Low density polyethylene (LDPE) 15 ~ 25%
Antistatic additive 0.8 ~ 1.5%.
Wherein, antistatic additive has the feature of surfactant, is generally the derivative of amine, quaternary ammonium salt, the derivative of sulfuric ester, phosphate and polyethylene glycol.Add antistatic additive and effectively can reduce material or product surface resistance and volume resistance, appropriateness improves electric conductivity, stops the material of electrostatic accumulation.
The thickness of the present embodiment internal layer: the thickness in middle level: the ratio of outer field thickness is limited between 2:1:2 ~ 1:1:1, compared with prior art, the thickness proportion of the three-layer co-extruded multilayer packing membrane three layers of the present embodiment is moderate, screw speed can be reduced, reduce unit interval feedstock transportation amount, thus reduction screen pack bears pressure, reaches the object of the waste product that extends manufacture cycle, reduces, other two-layer thickness proportion of corresponding raising then can keep same output, but reduces replacing.
The three-layer co-extruded multilayer packing membrane preparation method of the present embodiment is identical with embodiment 1, does not repeat them here.
embodiment 3.
A kind of three-layer co-extruded multilayer packing membrane of the present embodiment and the difference of embodiment 1 are, the component of this kind of three-layer co-extruded multilayer packing membrane is as follows:
Internal layer is made up of the component of following percentage by weight:
LLDPE 50%
Metallocene linear-low density polyethylene 50%,
Middle level is made up of the component of following percentage by weight:
LLDPE 30%
Metallocene linear-low density polyethylene 37%
Ethylene-vinyl acetate copolymer 3%
Medium density polyethylene 25%
Masterbatch 5%,
Skin is made up of the component of following percentage by weight:
LLDPE 20%
Metallocene linear-low density polyethylene 50%
Low density polyethylene (LDPE) 29%
Antistatic additive 1%.
Wherein, the metallocene linear-low density polyethylene of internal layer selects 5300 series of the large forest products of Korea S, the SP3 series that outer field metallocene linear-low density polyethylene selects LG Corp of South Korea to produce, the NX103 that outer field low density polyethylene (LDPE) selects Malaysian PETLIN company to produce.
The performance test results of the three-layer co-extruded multilayer packing membrane of the present embodiment is as following table 1:
Table 1
The three-layer co-extruded multilayer packing membrane excellent performance of the present embodiment as can be known from the above table.
The three-layer co-extruded multilayer packing membrane preparation method of the present embodiment is identical with embodiment 1, does not repeat them here.
embodiment 4.
A kind of three-layer co-extruded multilayer packing membrane of the present embodiment and the difference of embodiment 1 are, the component of this kind of three-layer co-extruded multilayer packing membrane is as follows:
Internal layer is made up of the component of following percentage by weight:
LLDPE 60%
Metallocene linear-low density polyethylene 40%,
Middle level is made up of the component of following percentage by weight:
LLDPE 30%
Metallocene linear-low density polyethylene 30%
Ethylene-vinyl acetate copolymer 5%
Medium density polyethylene 30%
Masterbatch 5%,
Skin is made up of the component of following percentage by weight:
LLDPE 30%
Metallocene linear-low density polyethylene 50%
Low density polyethylene (LDPE) 19.5%
Antistatic additive 0.5%.
Wherein, the dust that the metallocene linear-low density polyethylene of internal layer selects Exxon Neftegas Limited to produce can be precious serial, the 1810D that outer field low density polyethylene (LDPE) selects Maoming Petrochemical to produce.
The performance test results of the three-layer co-extruded multilayer packing membrane of the present embodiment is as following table 2:
Table 2
The three-layer co-extruded multilayer packing membrane excellent performance of the present embodiment as can be known from the above table.
The three-layer co-extruded multilayer packing membrane preparation method of the present embodiment is identical with embodiment 1, does not repeat them here.
embodiment 5.
A kind of three-layer co-extruded multilayer packing membrane of the present embodiment and the difference of embodiment 1 are, the component of this kind of three-layer co-extruded multilayer packing membrane is as follows:
Internal layer is made up of the component of following percentage by weight:
LLDPE 40%
Metallocene linear-low density polyethylene 60%,
Middle level is made up of the component of following percentage by weight:
LLDPE 20%
Metallocene linear-low density polyethylene 30%
Ethylene-vinyl acetate copolymer 6%
Medium density polyethylene 40%
Masterbatch 4%,
Skin is made up of the component of following percentage by weight:
LLDPE 25%
Metallocene linear-low density polyethylene 60%
Low density polyethylene (LDPE) 14.5%
Antistatic additive 0.5%.
Wherein, the SP3 that the metallocene linear-low density polyethylene of internal layer selects LG Corp of South Korea to produce is serial, the dust that outer field metallocene linear-low density polyethylene selects Exxon Neftegas Limited to produce can be precious serial, the 2520D that outer field low density polyethylene (LDPE) selects Maoming Petrochemical to produce.
The performance test results of the three-layer co-extruded multilayer packing membrane of the present embodiment is as following table 3:
Table 3
The three-layer co-extruded multilayer packing membrane excellent performance of the present embodiment as can be known from the above table, the good mechanical properties such as hot strength, tearing strength, fracture strength, the high temperature of resistance to heat-sealing.
The three-layer co-extruded multilayer packing membrane preparation method of the present embodiment is identical with embodiment 1, does not repeat them here.
embodiment 6.
A kind of three-layer co-extruded multilayer packing membrane of the present embodiment and the difference of embodiment 1 are, the component of this kind of three-layer co-extruded multilayer packing membrane is as follows:
Internal layer is made up of the component of following percentage by weight:
LLDPE 20%
Metallocene linear-low density polyethylene 80%,
Middle level is made up of the component of following percentage by weight:
LLDPE 20%
Metallocene linear-low density polyethylene 20%
Ethylene-vinyl acetate copolymer 15%
Medium density polyethylene 35%
Masterbatch 10%,
Skin is made up of the component of following percentage by weight:
LLDPE 60%
Metallocene linear-low density polyethylene 23%
Low density polyethylene (LDPE) 15%
Antistatic additive 2%.
The three-layer co-extruded multilayer packing membrane preparation method of the present embodiment is identical with embodiment 1, does not repeat them here.
embodiment 7.
A kind of three-layer co-extruded multilayer packing membrane of the present embodiment and the difference of embodiment 1 are, the component of this kind of three-layer co-extruded multilayer packing membrane is as follows:
Internal layer is made up of the component of following percentage by weight:
LLDPE 80%
Metallocene linear-low density polyethylene 20%,
Middle level is made up of the component of following percentage by weight:
LLDPE 58%
Metallocene linear-low density polyethylene 24%
Ethylene-vinyl acetate copolymer 3%
Medium density polyethylene 20%
Masterbatch 3%,
Skin is made up of the component of following percentage by weight:
LLDPE 15%
Metallocene linear-low density polyethylene 60%
Low density polyethylene (LDPE) 33.5%
Antistatic additive 1.5%.
The three-layer co-extruded multilayer packing membrane preparation method of the present embodiment is identical with embodiment 1, does not repeat them here.
embodiment 8.
A kind of three-layer co-extruded multilayer packing membrane of the present embodiment and the difference of embodiment 1 are, the component of this kind of three-layer co-extruded multilayer packing membrane is as follows:
Internal layer is made up of the component of following percentage by weight:
LLDPE 40%
Metallocene linear-low density polyethylene 60%,
Middle level is made up of the component of following percentage by weight:
LLDPE 24%
Metallocene linear-low density polyethylene 50%
Ethylene-vinyl acetate copolymer 3%
Medium density polyethylene 20%
Masterbatch 3%,
Skin is made up of the component of following percentage by weight:
LLDPE 3%
Metallocene linear-low density polyethylene 20%
Low density polyethylene (LDPE) 40%
Antistatic additive 1%.
The three-layer co-extruded multilayer packing membrane preparation method of the present embodiment is identical with embodiment 1, does not repeat them here.
embodiment 9.
A kind of three-layer co-extruded multilayer packing membrane of the present embodiment and the difference of embodiment 1 are, the component of this kind of three-layer co-extruded multilayer packing membrane is as follows:
Internal layer is made up of the component of following percentage by weight:
LLDPE 60%
Metallocene linear-low density polyethylene 40%,
Middle level is made up of the component of following percentage by weight:
LLDPE 20%
Metallocene linear-low density polyethylene 20%
Ethylene-vinyl acetate copolymer 3%
Medium density polyethylene 50%
Masterbatch 7%,
Skin is made up of the component of following percentage by weight:
LLDPE 38%
Metallocene linear-low density polyethylene 40%
Low density polyethylene (LDPE) 20%
Antistatic additive 2%.
The three-layer co-extruded multilayer packing membrane preparation method of the present embodiment is identical with embodiment 1, does not repeat them here.
Finally should be noted that; above embodiment is only for illustration of technical scheme of the present invention but not limiting the scope of the invention; although be explained in detail the present invention with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to technical scheme of the present invention or equivalent replacement, and not depart from essence and the scope of technical solution of the present invention.
Claims (8)
1. a three-layer co-extruded multilayer packing membrane, comprise amplexiform co-extrusion successively internal layer, middle level and skin, it is characterized in that:
Internal layer is made up of the component of following percentage by weight:
LLDPE 20 ~ 80%
Metallocene linear-low density polyethylene 20 ~ 80%,
Middle level is made up of the component of following percentage by weight:
LLDPE 20 ~ 50%
Metallocene linear-low density polyethylene 20 ~ 50%
Ethylene-vinyl acetate copolymer 3 ~ 15%
Medium density polyethylene 20 ~ 50%
Masterbatch 3 ~ 10%,
Skin comprises the component of following percentage by weight:
LLDPE 15 ~ 60%
Metallocene linear-low density polyethylene 20 ~ 60%
Low density polyethylene (LDPE) 15 ~ 40%;
The preparation method of described a kind of three-layer co-extruded multilayer packing membrane, comprises the following steps, the first step: prepare each layer film:
(1) preparation of internal layer membrane raw material:
The first single screw extrusion machine is sent into mixing after LLDPE and metallocene linear-low density polyethylene being mixed according to above-mentioned formula ratio, the extruder temperature of described first single screw extrusion machine is 150 ~ 190 DEG C, the head temperature of described first single screw extrusion machine is 170 ~ 200 DEG C, the rotating speed of described screw rod 40 ~ 100 revs/min, extrudes tonnage 30 ~ 50Mpa;
(2) preparation of middle level film raw material:
LLDPE, metallocene linear-low density polyethylene, ethylene-vinyl acetate copolymer, medium density polyethylene and Masterbatch is mixing according to sending into the second single screw extrusion machine after above-mentioned formula ratio mixing, the extruder temperature of described second single screw extrusion machine is 150 ~ 190 DEG C, the head temperature of described second single screw extrusion machine is 170 ~ 200 DEG C, described screw speed 40 ~ 100 revs/min, extrudes tonnage 30 ~ 50Mpa;
(3) preparation of outer membrane raw material:
LLDPE, metallocene linear-low density polyethylene and low density polyethylene (LDPE) are mixed according to above-mentioned formula ratio, do not add as required or add appropriate antistatic additive, again mixture is sent into the 3rd single screw extrusion machine mixing, the extruder temperature of described 3rd single screw extrusion machine is 150 ~ 190 DEG C, the head temperature of described 3rd single screw extrusion machine is 170 ~ 200 DEG C, described screw speed 40 ~ 100 revs/min, extrudes tonnage 30 ~ 50Mpa;
Second step: extrusion molding:
(1) flow-like internal layer membrane raw material, middle level film raw material and outer membrane raw material are delivered to simultaneously three-layer co-extruded go out the head of machine, three kinds of fluidised form raw materials described three-layer co-extruded go out to merge in machine extrude, form film bubble, film bubble is cooling forming under inside and outside temperature is the cooling air of 10 ~ 20 DEG C;
(2) shaping film bubble is by steady bubble frame stable bubble;
(3) again by the diameter of film bubble measuring instrument 360 degree of wheel measuring film bubbles and the distribution of thickness, and feed back to the adjustment that regulating system completes bubble thickness, then film bubble enters swivel mount, carry out the rotation of positive and negative circumference and realize the positive and negative circumference twisting of film bubble, be distributed to whole film bubble uniformly circumferentially to make bubble thickness;
(4) film bubble adjusted through above-mentioned steps (3) is pressed into through collapser and sends into draw-gear after flat and carry out traction and stretch, and obtaining draw ratio is 5 ~ 10 film bars;
3rd step: cooling film article:
(1) the film bar leaving described upper draw-gear being continued through successively 6 diameters is that the chill roll of 70 ~ 110 millimeters carries out first time cooling, logical running water in chill roll;
(2) film bar is continued through Air flow cabinet and carry out second time cooling, chilling temperature is 15 ~ 20 DEG C;
(3) film bar being continued again continue through successively 2 diameters is that the chill roll of 170 ~ 230 millimeters carries out third time cooling, logical cooling water in chill roll, and coolant water temperature is set as 5 ~ 10 DEG C;
4th step: rolling film article:
By the film obtained after the 3rd step cools by batching after marginal mode correction instrument and static eliminator, namely obtain clean and tidy semi-finished product film volume;
5th step: printing cutting:
The semi-finished product film volume 4th step obtained delivers to that printing machine carries out unreeling, high-frequency spark process, printing, heated-air drying, cold air drying, displacement, embossing, after insert edge and splitting winding, obtain three-layer co-extruded multilayer packing membrane.
2. the three-layer co-extruded multilayer packing membrane of one according to claim 1, is characterized in that: described skin also comprises the antistatic additive that percentage by weight is 0.5 ~ 2%.
3. the three-layer co-extruded multilayer packing membrane of one according to claim 2, is characterized in that:
Internal layer is made up of the component of following percentage by weight:
LLDPE 40 ~ 60%
Metallocene linear-low density polyethylene 40 ~ 60%,
Middle level is made up of the component of following percentage by weight:
LLDPE 25 ~ 40%
Metallocene linear-low density polyethylene 25 ~ 40%
Ethylene-vinyl acetate copolymer 5 ~ 10%
Medium density polyethylene 20 ~ 40%
Masterbatch 4 ~ 6%,
Skin is made up of the component of following percentage by weight:
LLDPE 20 ~ 40%
Metallocene linear-low density polyethylene 30 ~ 50%
Low density polyethylene (LDPE) 15 ~ 25%
Antistatic additive 0.8 ~ 1.5%.
4. the three-layer co-extruded multilayer packing membrane of one according to claim 2, is characterized in that:
Internal layer is made up of the component of following percentage by weight:
LLDPE 50%
Metallocene linear-low density polyethylene 50%,
Middle level is made up of the component of following percentage by weight:
LLDPE 30%
Metallocene linear-low density polyethylene 37%
Ethylene-vinyl acetate copolymer 3%
Medium density polyethylene 25%
Masterbatch 5%,
Skin is made up of the component of following percentage by weight: LLDPE 20%
Metallocene linear-low density polyethylene 50%
Low density polyethylene (LDPE) 29%
Antistatic additive 1%.
5. the three-layer co-extruded multilayer packing membrane of one according to claim 2, is characterized in that:
Internal layer is made up of the component of following percentage by weight:
LLDPE 60%
Metallocene linear-low density polyethylene 40%,
Middle level is made up of the component of following percentage by weight:
LLDPE 30%
Metallocene linear-low density polyethylene 30%
Ethylene-vinyl acetate copolymer 5%
Medium density polyethylene 30%
Masterbatch 5%,
Skin is made up of the component of following percentage by weight:
LLDPE 30%
Metallocene linear-low density polyethylene 50%
Low density polyethylene (LDPE) 19.5%
Antistatic additive 0.5%.
6. the three-layer co-extruded multilayer packing membrane of one according to claim 1, is characterized in that: the thickness of described internal layer, the thickness in described middle level and described outer field thickness proportion scope are 2:1:2 ~ 1:3:1.
7. the three-layer co-extruded multilayer packing membrane of one according to claim 6, is characterized in that: the thickness of described internal layer, the thickness in described middle level and described outer field thickness proportion scope are 2:1:2 ~ 1:1:1.
8. the three-layer co-extruded multilayer packing membrane of one according to claim 1, is characterized in that:
Described LLDPE is the LLDPE of the one or more kinds of monomer copolymerizations in butylene, hexene and octene, and the density of described LLDPE is 0.9 ~ 0.93 g/cm
3;
Described metallocene linear-low density polyethylene is the metallocene linear-low density polyethylene of the one or more kinds of monomer copolymerizations in metallocene catalyst catalyzing butene, hexene and octene, and the density of described LLDPE is 0.9 ~ 0.93 g/cm
3;
Described medium density polyethylene is the medium density polyethylene of the one or more kinds of monomer copolymerizations in butylene, hexene and octene, and the density of described medium density polyethylene is 0.93 ~ 0.94 g/cm
3;
Described low density polyethylene (LDPE) is homopolymerization low density polyethylene (LDPE), the density 0.91 ~ 0.95g/cm of described low density polyethylene (LDPE)
3;
The vinyl acetate content of described ethylene-vinyl acetate copolymer is 5 ~ 20%, density 0.91 ~ 0.95g/cm
3.
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