CN103029388A - 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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- CN103029388A CN103029388A CN2012105774724A CN201210577472A CN103029388A CN 103029388 A CN103029388 A CN 103029388A CN 2012105774724 A CN2012105774724 A CN 2012105774724A CN 201210577472 A CN201210577472 A CN 201210577472A CN 103029388 A CN103029388 A CN 103029388A
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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 the multilayer packing membrane technical field, particularly relate to a kind of three-layer co-extruded multilayer packing membrane and preparation method thereof.
Background technology
The three-layer co-extruded multilayer packing membrane industry of FFS was flourish in recent years, panoramic multilayer packing membrane continues to bring out, in order to guarantee that multilayer packing membrane has higher mechanical strength and heat seal strength, multilayer packing membrane is usually selected the high-density polyethylene resin (HDPE) of the ldpe resin (LDPE) of linear low density polyethylene resin (LLDPE), homopolymerization of metallocene linear-low density polyethylene resin (m-LLDP), hexene or the octene copolymer of hexene or octene copolymer and butylene copolymerization to be mixed and is made.Existing multilayer packing membrane is filled a prescription, and not only raw material is many, and the multilayer packing membrane intensity of preparation is undesirable.The linear low density polyethylene resin (m-LLDPE) of selecting a large amount of hexenes or octene copolymer is also arranged, the high-density polyethylene resin (HDPE) of the ldpe resin of homopolymerization (LDPE) and butylene copolymerization is mixed and makes, but the multilayer packing membrane that makes is because the higher LLDPE of intensity, the HDPE that m-LLDPE and rigidity are larger requires harsh to equipment processing ability, be difficult to extensive use production, and the solution of commonly using at present is to add the working ability that LDPE improves whole raw material, yet the adding of LDPE greatly reduces multilayer packing membrane intensity, has cut down the economic worth of product.
China's patent application (application number is 201010515776.9) discloses a kind of heavy packing FFS film, and it has three-decker, its ectomesoderm: middle level: the Thickness Ratio of internal layer is between between the 1:1:1 to 1:3:1; Skin contains two kinds of m-LLDPE, and itself and LDPE be 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 the middle level, and itself and HDPE, LDPE, titanium white be proportioning by a certain percentage; Internal layer contains 2 kinds of m-LLDPE, and itself and LDPE be proportioning by a certain percentage, also can add a certain amount of processing aid, opening agent etc.; The related m-LLDPE of this patent application is hervene copolymer m-LLDPE.This heavy packing is more with the LDPE amount that the FFS film uses, and affects the bulk strength of film, and simultaneously, HDPE is harsh to equipment requirement, needs to buy subscription specific equipment, and the production cost but also the producting process difficulty that have not only increased multilayer packing membrane are large, are difficult to promote the use of.
Summary of the invention
The three-layer co-extruded multilayer packing membrane that the object of the invention is to avoid weak point of the prior art and a kind of excellent performance is provided.
Purpose of the present invention is achieved through the following technical solutions.
A kind of three-layer co-extruded multilayer packing membrane comprises the internal layer, middle level and the skin that amplexiform successively co-extrusion, and internal layer is comprised of the component of following percentage by weight:
LLDPE 20 ~ 80%
Metallocene linear-low density polyethylene 20 ~ 80%,
The middle level is comprised 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 comprised of the component of following percentage by weight:
LLDPE 40 ~ 60%
Metallocene linear-low density polyethylene 40 ~ 60%,
The middle level is comprised 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%,
Outer component by following percentage by weight forms:
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 comprised of the component of following percentage by weight:
LLDPE 50%
Metallocene linear-low density polyethylene 50%,
The middle level is comprised 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%,
Outer component by following percentage by weight forms:
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 comprised of the component of following percentage by weight:
LLDPE 60%
Metallocene linear-low density polyethylene 40%,
The middle level is comprised 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%,
Outer component by following percentage by weight forms:
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 comprised of the component of following percentage by weight:
LLDPE 40%
Metallocene linear-low density polyethylene 60%,
The middle level is comprised 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%,
Outer component by following percentage by weight forms:
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, have higher softening temperature and melt temperature, have the advantages such as intensity is large, good toughness, rigidity is large, heat-resisting, cold resistance is good, also has good environmental stress crack resistance, the performance such as impact strength, tear-resistant intensity, but and acid and alkali resistance, organic solvent etc.And m-LLDPE can improve the mechanical performance of multilayer packing membrane effectively, reduce the osmotic bursting phenomenon, and good heat sealability is arranged when heat-sealing bag bag, m-LLDPE and LLDPE blend are as the main component of multilayer packing membrane of the present invention, the multilayer packing membrane that utilizes the distinctive linear structure of LLDPE that production is obtained not only has m-LLDPE and the desirable performance of LLDPE, and the production and processing technology requirement of m-LLDPE, extensively large-scale industrial production preparation have been reduced.
Above-mentioned EVA is very obvious in the superiority of the aspects such as elasticity, flexibility, glossiness and gas permeability, in addition, the environmental stress crack resistance of EVA is high, be subjected to capacitive large to filler, middle level of the present invention with EVA in the proper ratio with other composition blend, make three-layer co-extruded multilayer packing membrane of the present invention have higher light transmission, better advantages such as anti-droplet and heat insulating ability with respect to conventional art.
Among 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.
Among 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.
Among 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 the octene, and the molten finger of LLDPE 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 the octene, the molten finger of LLDPE 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 the octene, and the molten finger of medium density polyethylene is 0.1 ~ 1.5g/10min, and density is 0.93 ~ 0.94 g/cm
3
Low density polyethylene (LDPE) is the homopolymerization low density polyethylene (LDPE), molten 0.2 ~ 2g/10min, the density 0.91 ~ 0.95g/cm of referring to of low density polyethylene (LDPE)
3
The vinyl acetate content of ethylene-vinyl acetate copolymer is 5 ~ 20%, molten 0.2 ~ 3g/10min, the density 0.91 ~ 0.95g/cm of referring to
3
Invent another purpose 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 kind of preparation method of three-layer co-extruded multilayer packing membrane may further comprise the steps,
The first step: prepare each layer film:
(1) preparation of internal layer membrane raw material:
It is mixing to send into the first single screw extrusion machine after LLDPE and metallocene linear-low density polyethylene mixed according to above-mentioned formula ratio, the extruder temperature of the first single screw extrusion machine is 150～190 ℃, the head temperature of the first single screw extrusion machine is 170～200 ℃, 40～100 rev/mins of the rotating speeds of screw rod are extruded tonnage 30～50Mpa;
(2) preparation of middle level film raw material:
It is mixing to send into the second single screw extrusion machine after LLDPE, metallocene linear-low density polyethylene, ethylene-vinyl acetate copolymer, medium density polyethylene and Masterbatch mixed according to above-mentioned formula ratio, the extruder temperature of the second single screw extrusion machine is 150～190 ℃, the head temperature of the second single screw extrusion machine is 170～200 ℃, 40～100 rev/mins of screw speeds are extruded 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 an amount of antistatic additive, it is mixing mixture to be sent into the 3rd single screw extrusion machine again, the extruder temperature of the 3rd single screw extrusion machine is 150～190 ℃, the head temperature of the 3rd single screw extrusion machine is 170～200 ℃, 40～100 rev/mins of screw speeds are extruded 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 the three-layer co-extruded head that goes out machine, three kinds of fluidised form raw materials three-layer co-extruded go out to merge in the machine extrude, formation film bubble, film bubble are cooling forming under 10～20 ℃ the cooling air in inside and outside temperature;
(2) film of moulding bubble is by steady bubble frame stable bubble
(3) again by the diameter of film bubble measuring instrument 360 degree wheel measuring film bubbles and the distribution of thickness, and feed back to the adjusting that regulating system is finished bubble thickness, then the film bubble enters swivel mount, carry out positive and negative circumference rotation and realize that film steeps positive and negative circumference twisting, so that bubble thickness is distributed on the circumference of whole film bubble uniformly;
(4) send into draw-gear after the film bubble that above-mentioned steps (3) is adjusted is pressed into flat through collapser and draw stretching, obtaining draw ratio is 5～10 film bars;
The 3rd step: cooling film bar:
The film bar that (1) will leave draw-gear is that 70～110 millimeters chill roll carries out cooling first time by 6 diameters successively continuously, leads to running water in the chill roll;
(2) the film bar is continued carry out the cooling second time by the air cooling cabinet, chilling temperature is 15～20 ℃;
(3) the film bar being continued again successively continuously by 2 diameters is that 170～230 millimeters chill roll cools off for the third time, logical cooling water in the chill roll, and coolant water temperature is set as 5～10 ℃;
The 4th step: rolling film bar:
To batch after by marginal mode correction instrument and static eliminator through the film that obtains after the 3rd step cooling, namely obtain clean and tidy semi-finished product film volume;
The 5th step: printing cutting:
The semi-finished product film volume that the 4th step was obtained delivers to that printing machine unreels, behind high-frequency spark processing, printing, heated-air drying, cold air drying, displacement, embossing, insert edge and the 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 to be mixed, compare with traditional handicraft, the present invention not only provides higher heat sealability and mechanical strength, and because of raw material type few, the uniformity height that raw material is mixing, properties of product are on average stable, and heat-sealing temperature is more stable.The middle level adopts metallocene linear-low density polyethylene, LLDPE, ethylene-vinyl acetate copolymer, medium density polyethylene, color masterbatch to be mixed 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 simultaneously existence of ethylene-vinyl acetate copolymer makes the suppleness of this three-layer co-extruded multilayer packing membrane higher, and lower temperature resistance is stronger.Outer LLDPE, low density polyethylene (LDPE), metallocene linear-low density polyethylene and the antistatic additive of adopting is mixed in proportion, significantly eliminates the static of product, reduces dust and adheres to, and keeps clean and tidy.The present invention replaces traditional multilayer packing membrane with metallocene linear-low density polyethylene, medium density polyethylene, ethylene-vinyl acetate copolymer and LLDPE and uses poly-high density polyethylene (HDPE), LLDPE and metallocene linear-low density polyethylene are as body material, under suitable process conditions, intensity, toughness, heat seal strength and the deflection of product product have not only been improved, and properties of product all have stable, possess the climatic adaptation performance of height, can present good toughness 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 respectively internal layer, middle level and skin, the three-layer co-extruded multilayer packing membrane excellent performance of preparing, and this three-layer co-extruded multilayer packing membrane preparation method production technology is simple, device requirement is not harsh, cost is low, efficient is high.
The specific embodiment
The invention will be further described with the following Examples.
Embodiment 1.
A kind of three-layer co-extruded multilayer packing membrane comprises the internal layer, middle level and the skin that amplexiform successively co-extrusion, and internal layer is comprised of the component of following percentage by weight:
LLDPE 20 ~ 80%
Metallocene linear-low density polyethylene 20 ~ 80%,
The middle level is comprised 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 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 to be mixed, and compares with traditional handicraft, and the present invention not only provides higher heat sealability and mechanical strength, and because of raw material type few, the uniformity height that raw material is mixing, properties of product are on average stable, and heat-sealing temperature is more stable.The middle level adopts m-LLDPE, LLDPE, EVA, MDPE, color masterbatch to be mixed 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 simultaneously existence of EVA makes the suppleness of this three-layer co-extruded multilayer packing membrane higher, and lower temperature resistance is stronger.Outer LLDPE, LDPE, m-LLDPE and the antistatic additive of adopting is mixed in proportion, significantly eliminates the static of product, reduces dust and adheres to, and keeps clean and tidy.The present invention replaces traditional multilayer packing membrane with m-LLDPE, MDPE, EVA and LLDPE and uses poly-HDPE, LLDPE and m-LLDPE are as body material, under suitable process conditions, intensity, toughness, heat seal strength and the deflection of product product have not only been improved, and properties of product all have stable, possess the climatic adaptation performance of height, can present good toughness at low temperature environment.
The thickness of 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 in this scope has the following advantages: (1) requires to reduce to film blowing device, the production equipment adaptability of energy Effective Raise prescription.With under the Isoquant, the screw extruder rotating speed that one deck of raising thickness proportion adopts must raise, loss to screw rod also can strengthen, too high Thickness Ratio regular meeting affects screw rod service life, the thickness proportion that present embodiment is three layers can reasonably alleviate the production load of screw rod extruder, can and keep at different times more rationally controlling the screw extruder rotating speed under early stage of output, obviously prolong screw rod service life, thereby improve economic worth.(2) for prevent the impurity in the raw material or plastify bad raw material, burnt material enters the blown-film die runner, conventional blown film unit all arranges filtering area at head and screw extruder junction, filtering area is laid the screen pack of certain filtration order number.Along with being subject to impurity or plastifying the filter mesh that bad raw material, burnt material stop up increases gradually, screen pack bears pressure and can improve, and causes the change of screw extruder tonnage.If screen pack pressure surpasses a threshold value, gently then affect the raw material plasticizing quality, affect properties of product, heavy then cause that screen pack breaks, impurity or plastify bad raw material, Jiao expects directly to enter flow channel, film blowing device is damaged.Therefore when the pressure of screen pack was elevated to certain numerical value, inflation film manufacturing machine was shut down and is changed screen pack, thereby caused the debugging waste product that the production cycle shortens and production is opened, shut down.The thickness proportion that the three-layer co-extruded multilayer packing membrane of present embodiment is three layers is moderate, can reduce screw speed, reduce unit interval raw material conveying capacity, thereby reduce screen pack and bear pressure, reach the purpose that extends manufacture cycle, reduces waste product, other two-layer thickness proportion of corresponding raising then can keep same output, but reduces and changes.
The three-layer co-extruded multilayer packing membrane preparation method of present embodiment may further comprise the steps,
The first step: prepare each layer film
(1) preparation of internal layer membrane raw material
It is mixing to send into the first single screw extrusion machine after LLDPE and m-LLDPE mixed according to above-mentioned formula ratio, the screw diameter of the first single screw extrusion machine is 45 ~ 65mm, draw ratio is 30:1, this extruder temperature is 150～190 ℃, the head temperature of the first single screw extrusion machine is 170～200 ℃, 40～100 rev/mins of the rotating speeds of screw rod are extruded tonnage 30～50Mpa.
(2) preparation of middle level film raw material
It is mixing to send into the second single screw extrusion machine after LLDPE, m-LLDPE, EVA, MDPE and Masterbatch 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 ℃, the head temperature of the second single screw extrusion machine is 170～200 ℃, 40～100 rev/mins of screw speeds are extruded tonnage 30～50Mpa.
(3) preparation of outer membrane raw material
LLDPE, m-LLDPE and LDPE are mixed the rear antistatic additive that adds according to above-mentioned formula ratio, it is mixing mixture to be sent into the 3rd single screw extrusion machine again, the screw diameter of the 3rd single screw extrusion machine is 45 ~ 65mm, draw ratio is 30:1, this extruder temperature is 150～190 ℃, the head temperature of the 3rd single screw extrusion machine is 170～200 ℃, and 40～100 rev/mins of screw speeds are extruded 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 the three-layer co-extruded head that goes out machine, three kinds of fluidised form raw materials three-layer co-extruded go out to merge in the machine extrude, formation film bubble, film bubble are cooling forming under 10～20 ℃ the cooling air in inside and outside temperature;
(2) film of moulding bubble is by steady bubble frame stable bubble;
(3) again by the diameter of film bubble measuring instrument 360 degree wheel measuring film bubbles and the distribution of thickness, and feed back to the adjusting that regulating system is finished bubble thickness, then the film bubble enters swivel mount, carry out positive and negative circumference rotation and realize that film steeps positive and negative circumference twisting, so that bubble thickness is distributed on the circumference of whole film bubble uniformly;
(4) send into draw-gear after the film bubble that above-mentioned steps (3) is adjusted is pressed into flat through collapser and draw stretching, obtaining draw ratio is 5～10 film bars.
The present invention uses three-layer co-extrudedly goes out machine and is prior art, at this in detail its structure and principle is not described in detail.
The 3rd step: cooling film bar
The film bar that (1) will leave draw-gear is that 70～110 millimeters chill roll carries out cooling first time by 6 diameters successively continuously, leads to running water in the chill roll;
(2) the film bar is continued carry out the cooling second time by the air cooling cabinet, chilling temperature is 15～20 ℃;
(3) the film bar being continued again successively continuously by 2 diameters is that 170～230 millimeters chill roll cools off for the third time, logical cooling water in the chill roll, and coolant water temperature is set as 5～10 ℃.
The three-layer co-extruded multilayer packing membrane preparation method of present embodiment adopts the step by step cooling of three special road refrigerating work procedures, and better than one traditional chilling operation cooling effect, properties of product are more excellent.After the mould of tubulose became the film bar of flat, film bar temperature was higher, indivedual positions even be higher than 80 ℃, and the molecule of film bar still is in the prepattern state.If directly chilling makes high-temperature area degree of crystallinity be higher than other zones easily, 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 of step by step cooling, near but natural way of freezing mask, thickness, mechanical performance and heat sealability substantially do not have difference, product size is stable, and occurs without situations such as film distortion warpages.。
The 4th step: rolling film bar
To batch after by marginal mode correction instrument and static eliminator through the film that obtains after the 3rd step cooling, namely obtain clean and tidy semi-finished product film volume;
The 5th step: printing cutting
The semi-finished product film volume that the 4th step was obtained delivers to that printing machine unreels, behind high-frequency spark processing, printing, heated-air drying, cold air drying, displacement, embossing, insert edge and the 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 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, efficient is high.
Embodiment 2.
A kind of three-layer co-extruded multilayer packing membrane of present embodiment and the difference of embodiment 1 are that the component of this a kind of three-layer co-extruded multilayer packing membrane is as follows:
Internal layer is comprised of the component of following percentage by weight:
LLDPE 40 ~ 60%
Metallocene linear-low density polyethylene 40 ~ 60%,
The middle level is comprised 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%,
Outer component by following percentage by weight forms:
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 can effectively reduce material or product surface resistance and volume resistance, the material that appropriateness improves electric conductivity, stops static to be accumulated.
The thickness of 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 that the three-layer co-extruded multilayer packing membrane of present embodiment is three layers is moderate, can reduce screw speed, reduce unit interval raw material conveying capacity, bear pressure thereby reduce screen pack, reach the purpose that extends manufacture cycle, reduces waste product, other two-layer thickness proportion of corresponding raising then can keep same output, but reduces and changes.
The three-layer co-extruded multilayer packing membrane preparation method of 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 present embodiment and the difference of embodiment 1 are that the component of this a kind of three-layer co-extruded multilayer packing membrane is as follows:
Internal layer is comprised of the component of following percentage by weight:
LLDPE 50%
Metallocene linear-low density polyethylene 50%,
The middle level is comprised 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%,
Outer component by following percentage by weight forms:
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 is selected 5300 series of the large forest products of Korea S, the NX103 that the SP3 series that outer field metallocene linear-low density polyethylene selects LG Corp of South Korea to produce, outer field low density polyethylene (LDPE) select Malaysian PETLIN company to produce.
The performance test results of the three-layer co-extruded multilayer packing membrane of present embodiment such as following table 1:
Table 1
The three-layer co-extruded multilayer packing membrane excellent performance of present embodiment as can be known from the above table.
The three-layer co-extruded multilayer packing membrane preparation method of 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 present embodiment and the difference of embodiment 1 are that the component of this a kind of three-layer co-extruded multilayer packing membrane is as follows:
Internal layer is comprised of the component of following percentage by weight:
LLDPE 60%
Metallocene linear-low density polyethylene 40%,
The middle level is comprised 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%,
Outer component by following percentage by weight forms:
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 present embodiment such as following table 2:
Table 2
The three-layer co-extruded multilayer packing membrane excellent performance of present embodiment as can be known from the above table.
The three-layer co-extruded multilayer packing membrane preparation method of 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 present embodiment and the difference of embodiment 1 are that the component of this a kind of three-layer co-extruded multilayer packing membrane is as follows:
Internal layer is comprised of the component of following percentage by weight:
LLDPE 40%
Metallocene linear-low density polyethylene 60%,
The middle level is comprised 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%,
Outer component by following percentage by weight forms:
LLDPE 25%
Metallocene linear-low density polyethylene 60%
Low density polyethylene (LDPE) 14.5%
Antistatic additive 0.5%.
Wherein, the SP3 series that the metallocene linear-low density polyethylene of internal layer selects LG Corp of South Korea to produce, 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 present embodiment such as following table 3:
Table 3
The three-layer co-extruded multilayer packing membrane excellent performance of present embodiment as can be known from the above table, the good mechanical properties such as hot strength, tearing strength, fracture strength, heat-resisting envelope high temperature.
The three-layer co-extruded multilayer packing membrane preparation method of 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 present embodiment and the difference of embodiment 1 are that the component of this a kind of three-layer co-extruded multilayer packing membrane is as follows:
Internal layer is comprised of the component of following percentage by weight:
LLDPE 20%
Metallocene linear-low density polyethylene 80%,
The middle level is comprised 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%,
Outer component by following percentage by weight forms:
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 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 present embodiment and the difference of embodiment 1 are that the component of this a kind of three-layer co-extruded multilayer packing membrane is as follows:
Internal layer is comprised of the component of following percentage by weight:
LLDPE 80%
Metallocene linear-low density polyethylene 20%,
The middle level is comprised 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%,
Outer component by following percentage by weight forms:
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 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 present embodiment and the difference of embodiment 1 are that the component of this a kind of three-layer co-extruded multilayer packing membrane is as follows:
Internal layer is comprised of the component of following percentage by weight:
LLDPE 40%
Metallocene linear-low density polyethylene 60%,
The middle level is comprised 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%,
Outer component by following percentage by weight forms:
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 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 present embodiment and the difference of embodiment 1 are that the component of this a kind of three-layer co-extruded multilayer packing membrane is as follows:
Internal layer is comprised of the component of following percentage by weight:
LLDPE 60%
Metallocene linear-low density polyethylene 40%,
The middle level is comprised 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%,
Outer component by following percentage by weight forms:
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 present embodiment is identical with embodiment 1, does not repeat them here.
Should be noted that at last; above embodiment only is used for technical scheme of the present invention being described but not limiting the scope of the invention; although with reference to preferred embodiment the present invention has been done detailed description; those of ordinary skill in the art is to be understood that; can make amendment or be equal to replacement technical scheme of the present invention, and not break away from essence and the scope of technical solution of the present invention.
Claims (10)
1. a three-layer co-extruded multilayer packing membrane comprises the internal layer, middle level and the skin that amplexiform successively co-extrusion, it is characterized in that:
Internal layer is comprised of the component of following percentage by weight:
LLDPE 20 ~ 80%
Metallocene linear-low density polyethylene 20 ~ 80%,
The middle level is comprised 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%.
2. a kind of three-layer co-extruded multilayer packing membrane according to claim 1, it is characterized in that: described skin comprises that also percentage by weight is 0.5 ~ 2% antistatic additive.
3. a kind of three-layer co-extruded multilayer packing membrane according to claim 2 is characterized in that:
Internal layer is comprised of the component of following percentage by weight:
LLDPE 40 ~ 60%
Metallocene linear-low density polyethylene 40 ~ 60%,
The middle level is comprised 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%,
Outer component by following percentage by weight forms:
LLDPE 20 ~ 40%
Metallocene linear-low density polyethylene 30 ~ 50%
Low density polyethylene (LDPE) 15 ~ 25%
Antistatic additive 0.8 ~ 1.5%.
4. a kind of three-layer co-extruded multilayer packing membrane according to claim 2 is characterized in that:
Internal layer is comprised of the component of following percentage by weight:
LLDPE 50%
Metallocene linear-low density polyethylene 50%,
The middle level is comprised 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%,
Outer component by following percentage by weight forms: LLDPE 20%
Metallocene linear-low density polyethylene 50%
Low density polyethylene (LDPE) 29%
Antistatic additive 1%.
5. a kind of three-layer co-extruded multilayer packing membrane according to claim 2 is characterized in that:
Internal layer is comprised of the component of following percentage by weight:
LLDPE 60%
Metallocene linear-low density polyethylene 40%,
The middle level is comprised 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%,
Outer component by following percentage by weight forms:
LLDPE 30%
Metallocene linear-low density polyethylene 50%
Low density polyethylene (LDPE) 19.5%
Antistatic additive 0.5%.
6. a kind of three-layer co-extruded multilayer packing membrane according to claim 2 is characterized in that:
Internal layer is comprised of the component of following percentage by weight:
LLDPE 40%
Metallocene linear-low density polyethylene 60%,
The middle level is comprised 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%,
Outer component by following percentage by weight forms:
LLDPE 25%
Metallocene linear-low density polyethylene 60%
Low density polyethylene (LDPE) 14.5%
Antistatic additive 0.5%.
7. a kind of three-layer co-extruded multilayer packing membrane according to claim 1, it 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.
8. a kind of three-layer co-extruded multilayer packing membrane according to claim 7, it 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.
9. a kind of three-layer co-extruded multilayer packing membrane 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 the octene, and the molten finger of described LLDPE is 0.2 ~ 2.5g/10min, and density 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 the octene, the molten finger of described LLDPE is 0.5 ~ 2.5g/10min, and density 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 the octene, and the molten finger of described medium density polyethylene is 0.1 ~ 1.5g/10min, and density is 0.93 ~ 0.94 g/cm
3
Described low density polyethylene (LDPE) is the homopolymerization low density polyethylene (LDPE), molten 0.2 ~ 2g/10min, the density 0.91 ~ 0.95g/cm of referring to of described low density polyethylene (LDPE)
3
The vinyl acetate content of described ethylene-vinyl acetate copolymer is 5 ~ 20%, molten 0.2 ~ 3g/10min, the density 0.91 ~ 0.95g/cm of referring to
3
10. the preparation method of each described a kind of three-layer co-extruded multilayer packing membrane of claim 1 to 9 is characterized in that: may further comprise the steps the first step: prepare each layer film:
(1) preparation of internal layer membrane raw material:
It is mixing to send into the first single screw extrusion machine after LLDPE and metallocene linear-low density polyethylene mixed according to above-mentioned formula ratio, the extruder temperature of described the first single screw extrusion machine is 150～190 ℃, the head temperature of described the first single screw extrusion machine is 170～200 ℃, 40～100 rev/mins of the rotating speeds of described screw rod are extruded tonnage 30～50Mpa;
(2) preparation of middle level film raw material:
It is mixing to send into the second single screw extrusion machine after LLDPE, metallocene linear-low density polyethylene, ethylene-vinyl acetate copolymer, medium density polyethylene and Masterbatch mixed according to above-mentioned formula ratio, the extruder temperature of described the second single screw extrusion machine is 150～190 ℃, the head temperature of described the second single screw extrusion machine is 170～200 ℃, 40～100 rev/mins of described screw speeds are extruded 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 an amount of antistatic additive, it is mixing mixture to be sent into the 3rd single screw extrusion machine again, the extruder temperature of described the 3rd single screw extrusion machine is 150～190 ℃, the head temperature of described the 3rd single screw extrusion machine is 170～200 ℃, 40～100 rev/mins of described screw speeds are extruded 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 the three-layer co-extruded head that goes out machine, three kinds of fluidised form raw materials described three-layer co-extruded go out to merge in the machine extrude, formation film bubble, film bubble are cooling forming under 10～20 ℃ the cooling air in inside and outside temperature;
(2) film of moulding bubble is by steady bubble frame stable bubble;
(3) again by the diameter of film bubble measuring instrument 360 degree wheel measuring film bubbles and the distribution of thickness, and feed back to the adjusting that regulating system is finished bubble thickness, then the film bubble enters swivel mount, carry out positive and negative circumference rotation and realize that film steeps positive and negative circumference twisting, so that bubble thickness is distributed on the circumference of whole film bubble uniformly;
(4) send into draw-gear after the film bubble that above-mentioned steps (3) is adjusted is pressed into flat through collapser and draw stretching, obtaining draw ratio is 5～10 film bars;
The 3rd step: cooling film bar:
The film bar that (1) will leave described upper draw-gear is that 70～110 millimeters chill roll carries out cooling first time by 6 diameters successively continuously, leads to running water in the chill roll;
(2) the film bar is continued carry out the cooling second time by the air cooling cabinet, chilling temperature is 15～20 ℃;
(3) the film bar being continued again successively continuously by 2 diameters is that 170～230 millimeters chill roll cools off for the third time, logical cooling water in the chill roll, and coolant water temperature is set as 5～10 ℃;
The 4th step: rolling film bar:
To batch after by marginal mode correction instrument and static eliminator through the film that obtains after the 3rd step cooling, namely obtain clean and tidy semi-finished product film volume;
The 5th step: printing cutting:
The semi-finished product film volume that the 4th step was obtained delivers to that printing machine unreels, behind high-frequency spark processing, printing, heated-air drying, cold air drying, displacement, embossing, insert edge and the splitting winding, obtain three-layer co-extruded multilayer packing membrane.
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