CN108608702A - A kind of heat shrink films and preparation method thereof - Google Patents

A kind of heat shrink films and preparation method thereof Download PDF

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Publication number
CN108608702A
CN108608702A CN201810306933.1A CN201810306933A CN108608702A CN 108608702 A CN108608702 A CN 108608702A CN 201810306933 A CN201810306933 A CN 201810306933A CN 108608702 A CN108608702 A CN 108608702A
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layers
heat shrink
shrink films
layer
film
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Inventor
华永芬
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Wuxi Pacific New Material Co Ltd
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Wuxi Pacific New Material Co Ltd
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Priority to CN201810306933.1A priority Critical patent/CN108608702A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
    • 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
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/04—After-treatment of articles without altering their shape; Apparatus therefor by wave energy or particle radiation, e.g. for curing or vulcanising preformed articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/05—5 or more layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/308—Heat stability
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

The present invention provides a kind of heat shrink films and preparation method thereof, while having good shrinkage stress with shrinking percentage, and can improve the thermal stability and physical property of material, and avoid crimp when production, so as to effective for actual production and use；Heat shrink films are five layers of lamination layer structure, be followed successively by from outside to inside PE layer, EVA layer, PVDC layer, EVA layer, PE layer, the described PE layers mixed layer for PE and PP, the PP is homopolymerization PP, is copolymerized PP, one kind in block PP or several blends.

Description

A kind of heat shrink films and preparation method thereof
Technical field
The present invention relates to field of packaging material, specially a kind of heat shrink films and preparation method thereof.
Background technology
Heat shrink films are commonly called as shrinkable film, are that can occur significantly to shrink after one kind is heated, so as to wrap tightly article, and energy The film of its shape is kept for a long time；Heat shrink films are the developments with its application technology, and main two purposes are Packaging and label, and due to its it is good it is transparent, keep a public place clean, it is thief-proof, easy to use the features such as, heat shrink films become film packaging increasing Long most fast one of material；Simultaneously as its good printing, paracentesis resistance, wearability, can be close to rough and uneven in surface when shrinking Body surface the features such as, heat shrink films also become the maximum bright spot of label industry.
It is currently used to have polyvinyl chloride（PVC）Heat shrink films, polyvinylidene chloride（PVDC）Heat shrink films etc., but with Attention of the various countries to environmental protection and safety, PVC heat shrink films are since the feature of environmental protection is poor, difficult recycling, when burning the problems such as generation poison gas In the presence of being in gradually downward trend in the application of packaging field；Then comparatively PVDC heat shrink films apply relatively wider, peace Loopful protect, meet food hygiene requirement, by FDA certifications, can escort for food packaging safety, can be applied to cheese, soup, Snacks, retort pouch, medical package, dry type food packaging, biscuit and cereal preparation, pet food, lower film, sauce, meat in stretching The fields such as product, flexible package punch, bean product packaging, electronic product packaging, chemical industry packaging, but PVDC materials are too soft, operation Performance is bad, and crystallinity is strong, and perforation easy to crack, resistance to ag(e)ing is poor, influences the production and use of heat shrink films, and specially such as China Application No. is 201410427455.1 to disclose a kind of PVDC co-extrusions film for profit, and traditional Tie adhesives are replaced using EVA, Product is set more to meet sanitary standard, but the patented product is in actual production, thermal stability and physical property are all poor, production Film can crimp in the process, to affect its application in terms of actual production.
Invention content
For existing PVC heat shrink films poor performance, application is narrow, and the materials of PVDC heat shrink films is too soft, operating characteristics It is bad, crystallinity is strong, it is easy to crack perforation, resistance to ag(e)ing difference and PVDC co-extrusion films thermal stability and physical property it is poor, produce Film can crimp in the process, good having the present invention provides a kind of heat shrink films the problem of to influence to produce and use While shrinkage stress is with shrinking percentage, and the thermal stability and physical property of material can be improved, and avoid curling when production existing As so as to effective for actual production and use, in addition, the present invention also provides a kind of preparation methods of heat shrink films.
Its technical solution is a kind of such, heat shrink films, is five layers of lamination layer structure, is followed successively by PE from outside to inside Layer, EVA layer, PVDC layers, EVA layer, PE layer, which is characterized in that the described PE layers mixed layer for PE and PP, the PP are homopolymerization PP, copolymerization PP, one kind in block PP or several blends.
It is further characterized by：
The heat shrink films thickness is 30 μm ~ 100 μm, and the thickness ratio of each layer is 1 ~ 3: 1 ~ 2: 1 ~ 2: 1 ~ 2: 1 ~ 3；
The mass ratio of PE and PP is 1 ~ 5: 1 ~ 5 in PE layers described；
The PE is metallocene linear-low density polyethylene, linear low density polyethylene, high density polyethylene (HDPE), low density polyethylene (LDPE) With in extremely-low density metallocene linear-low density polyethylene one kind or several blends.
A kind of preparation method of heat shrink films, PE layers, EVA layer, PVDC layers, EVA layer, PE layers of raw material are put into respectively In extruder, and it is plasticized extrusion, subsequent cooling and shaping is simultaneously wound by winder, it is characterised in that：Each layer raw material input squeezes out Before machine, added with PP in PE layers described, and mixed with the PE in PE layers described.
It is further characterized by：
The extruder is five layers of extruder, after the PP for being 1 ~ 5: 1 ~ 5 with PE mass ratioes is separately added into PE layers described at two, The raw material of equivalent layer puts into the extruder after melting and is squeezed out through the co-extrusion die head of the extruder, and being formed has five layers of knot The fluid of structure, subsequent fluid enter sizing water jacket, and under the action of 5 DEG C ~ 18 DEG C of cooling water, cooling and shaping, being formed has five The heat shrink films embryo of layer structure；
The heat shrink films embryo of sizing is allowed to crosslink reaction after the radiation of high-voltage electricity beamlet, and the film after crosslinking is led through rubber roller Draw, is wound by rotary winder；
The radiation of high-voltage electricity beamlet is specially 100 KV of radiation voltage ~ 500KV, 1 kGy of dose of radiation ~ 10kGy；
Before crosslinking, cooling and shaping at heat shrink films embryo through far-infrared baking oven reheating, the film indusium after the completion of heating is blown It is expanded into type；
The temperature of reheating be higher than film softening point, and be less than film melting points；And the film embryo after reheating 80 DEG C ~ Under 90 DEG C of temperature condition, type is blown by way of above blowing or putting down and blow.
The invention has the advantages that preparation method is simple and practicable, cost of material is low, the PE layers of mixing for PE and PP Layer, PP are homopolymerization PP, copolymerization PP, one kind in block PP or several blends, by heat resistance exclusive in PP and low Deformation temperature may make heat shrink films stable structure, be not easy to crimp, good physical properties, is conducive to production and uses.
Specific implementation mode
Below according to specific embodiment, the present invention is described in further detail.
Embodiment one
A kind of heat shrink films, be five layers of lamination layer structure, heat shrink films thickness be 50 μm, and be followed successively by from outside to inside PE layers, EVA layer, PVDC layers, EVA layer, PE layer, the PE layers of mixed layer for PE and PP, the mass ratio of PE and PP is 1 in PE layers：1, PP is Polypropylene, specially a kind of homopolymerization PP of modification, melt index 5.1g/10min, density 0.913g/cm3；PP is then added Five layers of thickness ratio is 3: 1: 2: 1: 3 afterwards.
It is 1 that PE, which is according to mass ratio,：1：1 metallocene linear-low density polyethylene, high density polyethylene (HDPE) and low-density is poly- The blend of ethylene, wherein the melt index of low density polyethylene (LDPE) is 0.3g/10min, density 0.923g/cm3；Metallocene The melt index of linear low density polyethylene is 1.0g/10min, density 0.918g/cm3；The melting of high density polyethylene (HDPE) refers to Number is 0.7g/10min, density 0.961g/cm3；For 4.5g/10min, density is the EVA melt index used in EVA layer 0.937g/cm3, PVDC is used in PVDC layers.
A kind of preparation method of heat shrink films, step of preparation process are：
One, raw material is chosen
PE layers of selection, EVA layer, PVDC layers of raw material；
Two, it squeezes out
The raw material of selection is put into extruder respectively, plasticizing squeezes out；
Specifically, extruder is five layers of extruder, be sequentially placed into from outside to inside in five layers of extruder PE layers, EVA layer, PVDC layers, EVA layer, PE layers of raw material, the mass ratio of PE and PP is 1 in wherein PE layers：1, the raw material being then added melts in five layers of extruder The co-extrusion die head through extruder squeezes out after melting, and forms the fluid with five-layer structure；
Three, film embryo forming
The fluid with five-layer structure squeezed out from co-extrusion die head enters sizing water jacket, cold under the action of 10 DEG C of cooling water But it shapes, forms the heat shrink films embryo with five-layer structure, the cooling velocity by cooling certifiable film embryo and the cooling uniformity, So that it is guaranteed that the percent thermal shrinkage and physical mechanical property of product；
Four, reheating
The film embryo of cooling and shaping is heated through far-infrared baking oven, wherein temperature is higher than film softening point, and is less than film melting points；
Five, inflation
Under 82 DEG C of temperature condition, the film embryo after reheating is blown into type by way of above blowing or putting down and blow；
Six, it is crosslinked
The molding film of inflation is radiated by high-voltage electricity beamlet so that film crosslinks reaction, and film can be improved by crosslinking Physical mechanical property and hot property；Wherein, the radiation of high-voltage electricity beamlet is specially radiation voltage 100 KV, dose of radiation 1kGy；
Seven, it winds
Film after crosslinking is drawn through rubber roller, is wound by rotary winder.
The tensile strength of obtained heat shrink films（MD/TD）For 54/48Mpa, elongation at break（MD/TD）It is 60/250%, Percent thermal shrinkage（82 DEG C of * 3s, MD/TD）It is 35%/40%.
Embodiment two
A kind of heat shrink films, be five layers of lamination layer structure, heat shrink films thickness be 100 μm, be followed successively by from outside to inside PE layers, EVA layer, PVDC layers, EVA layer, PE layer, the PE layers of both sides are the mixed layer of PE and PP, and the mass ratio of PE and PP is 3 in PE layers: 2, PP use the copolymerization PP, melt index 6.0g/10min, density 0.9g/cm of a kind of modification3；Five layers are then added after PP Thickness ratio is 2: 1: 1: 1: 2.
PE be according to mass ratio be 2: 1: 1 low density polyethylene (LDPE), metallocene linear-low density polyethylene, extremely-low density cyclopentadienyl The melt index of the blend of metal linear low density polyethylene (LDPE), low density polyethylene (LDPE) is 0.3g/10min, density 0.923g/ cm3；The melt index of metallocene linear-low density polyethylene is 1.0g/10min, density 0.918g/cm3；Extremely-low density cyclopentadienyl gold The melt index for belonging to linear low density polyethylene is 1.0g/10min, density 0.912g/cm3；EVA meltings in EVA layer refer to Number is 4.5g/10min, density 0.937g/cm3, PVDC is used in PVDC layers.
A kind of preparation method of heat shrink films, step of preparation process are：
One, raw material is chosen
PE layers of selection, EVA layer, PVDC layers of raw material；
Two, it squeezes out
The raw material of selection is put into extruder respectively, plasticizing squeezes out；
Specifically, extruder is five layers of extruder, be sequentially placed into from outside to inside in five layers of extruder PE layers, EVA layer, PVDC layers, EVA layer, PE layers of raw material, the mass ratio of PE and PP is 3: 2 in wherein PE layers, and the raw material being then added melts in five layers of extruder The co-extrusion die head through extruder squeezes out after melting, and forms the fluid with five-layer structure；
Three, film embryo forming
The fluid with five-layer structure squeezed out from co-extrusion die head enters sizing water jacket, cold under the action of 18 DEG C of cooling water But it shapes, forms the heat shrink films embryo with five-layer structure, the cooling velocity by cooling certifiable film embryo and the cooling uniformity, So that it is guaranteed that the percent thermal shrinkage and physical mechanical property of product；
Four, reheating
The film embryo of cooling and shaping is heated through far-infrared baking oven, wherein temperature is higher than film softening point, and is less than film melting points；
Five, inflation
Under 90 DEG C of temperature condition, the film embryo after reheating is blown into type by way of above blowing or putting down and blow；
Six, it is crosslinked
The molding film of inflation is radiated by high-voltage electricity beamlet so that film crosslinks reaction, and film can be improved by crosslinking Physical mechanical property and hot property；Wherein, the radiation of high-voltage electricity beamlet is specially radiation voltage 500KV, dose of radiation 10kGy；
Seven, it winds
Film after crosslinking is drawn through rubber roller, is wound by rotary winder.
The tensile strength of obtained heat shrink films（MD/TD）For 50/45Mpa, elongation at break（MD/TD）50/200%, heat Shrinking percentage（82 DEG C of * 3s, MD/TD）It is 30%/35%.
Embodiment three
A kind of heat shrink films are five layers of lamination layer structure, and heat shrink films thickness is 80 μm, is followed successively by PE layers, EVA from outside to inside Layer, PVDC layer, EVA layer, PE layer, the PE layers of mixed layer for PE and PP, the mass ratio of PE and PP is 2: 1, PP uses in PE layers A kind of the copolymerization PP of modification, melt index 7g/10min, density 0.89g/cm3；The thickness ratio for being then added five layers after PP is 3 ∶1∶1∶1∶3。
PE be 1: 2 according to mass ratio low density polyethylene (LDPE) and extremely-low density metallocene linear-low density polyethylene be total to Mixed object；The melt index of low density polyethylene (LDPE) is 0.3g/10min, density 0.923g/cm3；Extremely-low density metallocene linear is low The melt index of density polyethylene is 1.0g/10min, density 0.912g/cm3；EVA melt index in EVA layer are 4.5g/ 10min, density 0.937g/cm3, PVDC is used in PVDC layers.
A kind of preparation method of heat shrink films, step of preparation process are：
One, raw material is chosen
PE layers of selection, EVA layer, PVDC layers of raw material；
Two, it squeezes out
The raw material of selection is put into extruder respectively, plasticizing squeezes out；
Specifically, extruder is five layers of extruder, be sequentially placed into from outside to inside in five layers of extruder PE layers, EVA layer, PVDC layers, EVA layer, PE layers of raw material, the mass ratio of PE and PP is 2: 1 in wherein PE layers, and the raw material being then added melts in five layers of extruder The co-extrusion die head through extruder squeezes out after melting, and forms the fluid with five-layer structure；
Three, film embryo forming
The fluid with five-layer structure squeezed out from co-extrusion die head enters sizing water jacket, cold under the action of 15 DEG C of cooling water But it shapes, forms the heat shrink films embryo with five-layer structure, the cooling velocity by cooling certifiable film embryo and the cooling uniformity, So that it is guaranteed that the percent thermal shrinkage and physical mechanical property of product；
Four, reheating
The film embryo of cooling and shaping is heated through far-infrared baking oven, wherein temperature is higher than film softening point, and is less than film melting points；
Five, inflation
Under 87 DEG C of temperature condition, the film embryo after reheating is blown into type by way of above blowing or putting down and blow；
Six, it is crosslinked
The molding film of inflation is radiated by high-voltage electricity beamlet so that film crosslinks reaction, and film can be improved by crosslinking Physical mechanical property and hot property；Wherein, the radiation of high-voltage electricity beamlet is specially radiation voltage 200KV, dose of radiation 4kGy；
Seven, it winds
Film after crosslinking is drawn through rubber roller, is wound by rotary winder.
The tensile strength of obtained heat shrink films（MD/TD）For 60/49Mpa, elongation at break（MD/TD）It is 40/180%, Percent thermal shrinkage（82 DEG C of * 3s, MD/TD）It is 37%/40%.
Example IV
A kind of heat shrink films are five layers of lamination layer structure, and heat shrink films thickness is 30 μm, is followed successively by PE layers, EVA from outside to inside Layer, PVDC layer, EVA layer, PE layer, the PE layers of mixed layer for PE and PP, in PE layers the mass ratio of PE and PP be 2: 1, PP for by According to mass ratio be 3: 2: 1 modified copolymer PP, homopolymerization PP and block PP blend；The melt index for being copolymerized PP is 7g/ 10min, density 0.89g/cm3；The melt index of homopolymerization PP is 12g/10min, density 0.9g/cm3；It is copolymerized the melting of PP Index is 9.3g/10min, density 0.91g/cm3；The thickness ratio for being then added five layers after PP is 2: 1: 2: 1: 2.
PE be 1: 2 according to mass ratio low density polyethylene (LDPE) and extremely-low density metallocene linear-low density polyethylene be total to Mixed object；The melt index of low density polyethylene (LDPE) is 0.3g/10min, density 0.923g/cm3；Extremely-low density metallocene linear is low The melt index of density polyethylene is 1.0g/10min, density 0.912g/cm3；EVA melt index in EVA layer are 4.5g/ 10min, density 0.937g/cm3, PVDC is used in PVDC layers.
A kind of preparation method of heat shrink films, step of preparation process are：
One, raw material is chosen
PE layers of selection, EVA layer, PVDC layers of raw material；
Two, it squeezes out
The raw material of selection is put into extruder respectively, plasticizing squeezes out；
Specifically, extruder is five layers of extruder, be sequentially placed into from outside to inside in five layers of extruder PE layers, EVA layer, PVDC layers, EVA layer, PE layers of raw material, the mass ratio of PE and PP is 2: 1 in wherein PE layers, and the raw material being then added melts in five layers of extruder The co-extrusion die head through extruder squeezes out after melting, and forms the fluid with five-layer structure；
Three, film embryo forming
The fluid with five-layer structure squeezed out from co-extrusion die head enters sizing water jacket, cooling under the action of 5 DEG C of cooling water Sizing forms the heat shrink films embryo with five-layer structure, the cooling velocity by cooling certifiable film embryo and the cooling uniformity, from And ensure the percent thermal shrinkage and physical mechanical property of product；
Four, reheating
The film embryo of cooling and shaping is heated through far-infrared baking oven, wherein temperature is higher than film softening point, and is less than film melting points；
Five, inflation
Under 80 DEG C of temperature condition, the film embryo after reheating is blown into type by way of above blowing or putting down and blow；
Six, it is crosslinked
The molding film of inflation is radiated by high-voltage electricity beamlet so that film crosslinks reaction, and film can be improved by crosslinking Physical mechanical property and hot property；Wherein, the radiation of high-voltage electricity beamlet is specially radiation voltage 200KV, dose of radiation 4kGy；
Seven, it winds
Film after crosslinking is drawn through rubber roller, is wound by rotary winder.
The tensile strength of the heat shrink films arrived（MD/TD）For 53/45Mpa, elongation at break（MD/TD）It is 53/210%, heat Shrinking percentage（82 DEG C of * 3s, MD/TD）It is 45%/57%.
In conclusion preparation method is simple by the present invention, cost of material is low, and the PE layers of film are the mixing of PE and PP Layer, by heat resistance exclusive PP and low deformation temperature, may make heat shrink films stable structure, is not easy to crimp, physical property is excellent It is good, it is conducive to production and uses, and in preparation process, radiated by high-voltage electricity beamlet, makes to crosslink between co-extrusion membrane molecule, So that film reticulates structure by linear chain thaumatropy, the physics and heat resistance to make co-extrusion film also change, Compared to common heat shrink films, there is higher heat seal strength, the stronger machinery of resistance to surface to scratch performance and lower heat receipts Contracting temperature and broader heat-sealing temperature range, heat shrink films obtained have free from extraneous odour, are received without curling, good toughness, intensity height, heat Shrinkage is high, heat-resist, can be used for outer packing and the collective type packaging of the every profession and trades product such as food, cosmetics, toy, electronics.

Claims (10)

  1. Be five layers of lamination layer structure 1. a kind of heat shrink films, be followed successively by from outside to inside PE layers, EVA layer, PVDC layers, EVA layer, PE layers, which is characterized in that the described PE layers mixed layer for PE and PP, the PP are one in homopolymerization PP, copolymerization PP, block PP Kind or several blends.
  2. 2. a kind of heat shrink films according to claim 1, it is characterised in that：The heat shrink films thickness is 30 μm ~ 100 μ M, and the thickness ratio of each layer is 1 ~ 3: 1 ~ 2: 1 ~ 2: 1 ~ 2: 1 ~ 3.
  3. 3. a kind of heat shrink films according to claim 1, it is characterised in that：The mass ratio of PE and PP is in PE layers described 1~5∶1~5。
  4. 4. a kind of heat shrink films according to claim 1, it is characterised in that：The PE is the poly- second of metallocene linear low density Alkene, linear low density polyethylene, high density polyethylene (HDPE), low density polyethylene (LDPE) and extremely-low density metallocene linear-low density polyethylene In one kind or several blends.
  5. 5. using a kind of preparation method of heat shrink films as described in claim 1 ~ 4 is any, by PE layers, EVA layer, PVDC Layer, EVA layer, PE layers of raw material is put into extruder respectively, and is plasticized extrusion, and subsequent cooling and shaping is simultaneously wound by winder, It is characterized in that：Before each layer raw material input extruder, added with PP in PE layers described, and mixed with the PE in PE layers described.
  6. 6. a kind of preparation method of heat shrink films according to claim 5, it is characterised in that：The extruder is five layers and squeezes Go out machine, after the PP for being 1 ~ 5: 1 ~ 5 with PE mass ratioes is separately added into PE layers described at two, the raw material input of equivalent layer is described to squeeze Go out in machine after melting and squeezed out through the co-extrusion die head of the extruder, form the fluid with five-layer structure, subsequent fluid enters Sizing water jacket, under the action of 5 DEG C ~ 18 DEG C of cooling water, cooling and shaping forms the heat shrink films embryo with five-layer structure.
  7. 7. a kind of preparation method of heat shrink films according to claim 5, it is characterised in that：The heat shrink films embryo of sizing passes through Cross high-voltage electricity beamlet radiation after be allowed to crosslink reaction, the film after crosslinking is drawn through rubber roller, by rotary winder into Row winding.
  8. 8. a kind of preparation method of heat shrink films according to claim 7, it is characterised in that：The radiation of high-voltage electricity beamlet is specific For 100 KV of radiation voltage ~ 500KV, 1 kGy of dose of radiation ~ 10kGy.
  9. 9. a kind of preparation method of heat shrink films according to claim 5, it is characterised in that：Before crosslinking, cooling and shaping At heat shrink films embryo through far-infrared baking oven reheating, the molding of film indusium inflation after the completion of heating.
  10. 10. a kind of preparation method of heat shrink films according to claim 9, it is characterised in that：The temperature of reheating is Higher than film softening point, and it is less than film melting points；And the film embryo after reheating leads under 80 DEG C ~ 90 DEG C of temperature condition It crosses and blows or the flat mode blown is blown into type.
CN201810306933.1A 2018-04-08 2018-04-08 A kind of heat shrink films and preparation method thereof Pending CN108608702A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021026993A1 (en) * 2019-08-09 2021-02-18 广东安德力新材料有限公司 Heat shrink film and preparation method therefor
CN112743950A (en) * 2020-12-29 2021-05-04 东莞市正新包装制品有限公司 High-temperature-resistant heat shrinkable film and preparation method and application thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5059481A (en) * 1985-06-17 1991-10-22 Viskase Corporation Biaxially stretched, heat shrinkable VLDPE film
CN102431258A (en) * 2011-09-01 2012-05-02 广州市得力仕食品包装有限公司 Multilayer heat shrinkage film

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5059481A (en) * 1985-06-17 1991-10-22 Viskase Corporation Biaxially stretched, heat shrinkable VLDPE film
CN102431258A (en) * 2011-09-01 2012-05-02 广州市得力仕食品包装有限公司 Multilayer heat shrinkage film

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021026993A1 (en) * 2019-08-09 2021-02-18 广东安德力新材料有限公司 Heat shrink film and preparation method therefor
CN112743950A (en) * 2020-12-29 2021-05-04 东莞市正新包装制品有限公司 High-temperature-resistant heat shrinkable film and preparation method and application thereof

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Application publication date: 20181002