CN207345171U - A kind of heat shrink films suitable for the automatic fast package of production line - Google Patents
A kind of heat shrink films suitable for the automatic fast package of production line Download PDFInfo
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- CN207345171U CN207345171U CN201721367148.4U CN201721367148U CN207345171U CN 207345171 U CN207345171 U CN 207345171U CN 201721367148 U CN201721367148 U CN 201721367148U CN 207345171 U CN207345171 U CN 207345171U
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- 229920006300 shrink film Polymers 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 239000010410 layer Substances 0.000 claims abstract description 207
- 230000004888 barrier function Effects 0.000 claims abstract description 49
- 238000007789 sealing Methods 0.000 claims abstract description 48
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 claims abstract description 43
- 239000004715 ethylene vinyl alcohol Substances 0.000 claims abstract description 41
- 229920001526 metallocene linear low density polyethylene Polymers 0.000 claims abstract description 35
- 229920005989 resin Polymers 0.000 claims abstract description 23
- 239000011347 resin Substances 0.000 claims abstract description 23
- 239000011241 protective layer Substances 0.000 claims abstract description 11
- 238000004806 packaging method and process Methods 0.000 claims abstract description 9
- 229920003182 Surlyn® Polymers 0.000 claims abstract description 5
- 229920001862 ultra low molecular weight polyethylene Polymers 0.000 claims abstract description 5
- UFRKOOWSQGXVKV-UHFFFAOYSA-N ethene;ethenol Chemical compound C=C.OC=C UFRKOOWSQGXVKV-UHFFFAOYSA-N 0.000 claims abstract 7
- 239000004698 Polyethylene Substances 0.000 claims description 32
- 239000012528 membrane Substances 0.000 claims description 16
- 230000008602 contraction Effects 0.000 abstract description 5
- 238000012856 packing Methods 0.000 abstract description 4
- 238000010618 wire wrap Methods 0.000 abstract description 2
- 239000004952 Polyamide Substances 0.000 description 110
- 229920002647 polyamide Polymers 0.000 description 110
- 229920000573 polyethylene Polymers 0.000 description 27
- 229920000728 polyester Polymers 0.000 description 16
- 239000005038 ethylene vinyl acetate Substances 0.000 description 14
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 14
- 239000000463 material Substances 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 12
- 239000000047 product Substances 0.000 description 10
- 238000007334 copolymerization reaction Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000001816 cooling Methods 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 238000007493 shaping process Methods 0.000 description 5
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 3
- 229920000570 polyether Polymers 0.000 description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 2
- 239000004721 Polyphenylene oxide Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 239000012785 packaging film Substances 0.000 description 2
- 229920006280 packaging film Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229920005862 polyol Polymers 0.000 description 2
- 150000003077 polyols Chemical class 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229920006257 Heat-shrinkable film Polymers 0.000 description 1
- DYAHQFWOVKZOOW-UHFFFAOYSA-N Sarin Chemical compound CC(C)OP(C)(F)=O DYAHQFWOVKZOOW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000002079 cooperative effect Effects 0.000 description 1
- 238000012718 coordination polymerization Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 150000005690 diesters Chemical class 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229920005648 ethylene methacrylic acid copolymer Polymers 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000012793 heat-sealing layer Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 229920005684 linear copolymer Polymers 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000012968 metallocene catalyst Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- KUCOHFSKRZZVRO-UHFFFAOYSA-N terephthalaldehyde Chemical compound O=CC1=CC=C(C=O)C=C1 KUCOHFSKRZZVRO-UHFFFAOYSA-N 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Wrappers (AREA)
- Laminated Bodies (AREA)
Abstract
Heat shrink films field is the utility model is related to, is specifically a kind of heat shrink films suitable for the automatic fast package of production line, including positioned at the top layer of outer surface, positioned at the hot sealing layer of inner surface, and the barrier layer being arranged between top layer and hot sealing layer；The barrier layer includes one layer of EVOH and obstructs intermediate layer, and EVOH barriers intermediate layer at least side is equipped with one layer of barrier layer protective layer, and the barrier layer protective layer is PA layers；The top layer is PA layers；The hot sealing layer is POP layers or mLLDPE layers, ULDPE layers, one kind in Surlyn resin beds, or the blended layer of POP and mLLDPE；Connected respectively by adhering resin between the top layer and barrier layer, barrier layer and hot sealing layer.The heat shrink films of the utility model have high-barrier, and high intensity, heat sealability is good, at the same have it is excellent walk machine performance, manner of packing and packaging efficiency suitable in wire wrapping, will automatically change contraction bag.
Description
Technical field
Heat-shrinkable film technology field is the utility model is related to, is that one kind is suitable for the automatic Fast Packet of production line specifically
The heat shrink films of dress.
Background technology
Shrink film is widely used in food, medicine, sterilizing dinnerware, stationery sports goods, process gift, printed matter, hardware plastics
The outer packing of product, phone, electronic apparatus etc. various products, especially in anomalistic object article or the combined type of commodity
In terms of (boundling) packaging, it can meet that the moisture-proof of commodity dust-proof, touch-proof substitute for another surreptitiously, the function such as transparent display and increases product
Eye appeal, it can also be used to instead of all kinds of cartons.Traditional contraction bag manner of packing is less efficient, can not realize on-line automatic
Packaging.
Chinese patent literature CN106739356 discloses a kind of multi-layer co-extruded shrink film, including in co-extrusion shrink film
The hot sealing layer on surface and the resistant to mechanical damage layer of outer surface, are provided with barrier intermediate layer between hot sealing layer and resistant to mechanical damage layer,
Barrier intermediate layer includes at least one layer of ethylene-vinyl alcohol copolymer and obstructs sandwich layer and be separately positioned on barrier sandwich layer both sides at least
One level internal layer, is provided with time outer layer between secondary internal layer and resistant to mechanical damage layer, secondary outer layer and resistant to mechanical damage layer and be located at
Connected respectively by adhering resin layer between the secondary internal layer of barrier interlayer surfaces；The material of hot sealing layer is polyethylene；Secondary internal layer
Material be polyamide or polyethylene.But on a kind of heat shrink films suitable for the automatic fast package of production line at present also not
Appear in the newspapers.
The content of the invention
The purpose of the utility model is to overcome defect existing in the prior art, there is provided it is automatic that one kind is suitable for production line
The heat shrink films of fast package.
The technical problem that the utility model solves is：1. heat sealability-the low-temperature heat-sealing and heat seal strength of film will height；
2. film walks machine performance-preferable film flatness, flexibility；3. the shrinkage of film-higher percent thermal shrinkage.
Original technology：1) blown film 2) printing-bag making 3) hand-filling 4) vacuum-pumping and sealing 5) thermal contraction-packed products.And
The utility model：1) blown film 2) printing-cutting 3) on machine pack automatically-cuts-vacuum-pumping and sealing-thermal contraction-packed products, greatly
It is big to improve packaging efficiency, operating process and step are reduced, reduces the pollution risk of product.There is the utility model contraction bag to be gathered around
Some excellent properties high-barriers, high intensity, heat sealability is good, at the same have it is excellent walk machine performance, suitable for full-automatic online
Packaging.
The first aspect of the utility model, there is provided a kind of heat shrink films suitable for the automatic fast package of production line, including
Positioned at the top layer of outer surface, positioned at the hot sealing layer of inner surface, and the barrier layer being arranged between top layer and hot sealing layer；The resistance
Interlayer includes one layer of ethylene-vinyl alcohol copolymer (EVOH) and obstructs intermediate layer, and EVOH barriers intermediate layer at least side is set
There is one layer of barrier layer protective layer, the barrier layer protective layer is polyamide (PA) layer；The top layer is PA layers or polyester
(PET) layer；The hot sealing layer is POP layers or metallocene linear low density polyethylene (mLLDPE) layer, ultra-low density polyethylene
(ULDPE) one kind in layer, Surlyn resin beds, or the blended layer of POP and mLLDPE；The top layer and barrier layer, barrier
Connected respectively by adhering resin (abbreviation Tie) between layer and hot sealing layer.
The polyester (PET), the polymer general name as obtained by polyalcohol and polyacid polycondensation, refers mainly to poly- terephthaldehyde
Sour second diester.Equipolymers, EASTMAN, the Dufor trades mark C series, GN series, FX series etc. may be selected.
The Surlyn resins are that du pont company of Du Pont is polymerized using unique production technology, are by high pressure
The ethylene-methacrylic acid copolymer of radical polymerization is through partly or entirely neutralizing and a kind of manufactured copolymer.
The POP is vinyl polymer graft polyether polyol, is commonly called as " polymer polyatomic alcohol " (Polyether
Polyol), abbreviation polyethers (POP), is the thermoplastic elastic that in-situ polymerization is realized using the ethene and octene of metallocene catalyst
Body.SABIC, Exxonmobil, DOW trades mark COHERE8380, COHERE8185,9061,9071,9182 may be selected,
KC8852G, VP8770G1,1881G, 1850G etc..
Metallocene linear low density polyethylene (the metallocene linear low density
Polyethylene, abbreviation mLLDPE) with metallocene compound catalyst is made, there is narrow ditribution molecule through what coordination polymerization obtained
The ethene of amount and the linear copolymers of thing-alkene.PRIME, Exxonmobil, the DOW trade mark 1018MF, 2018KB may be selected,
1012HJ, SP 1520 etc..
Preferably, structure sheaf is equipped between the top layer and barrier layer, the structure sheaf is selected from polyethylene (PE)
Layer, ethylene-vinyl acetate copolymer (EVA) layer, POP layers, one or both of PP layers of blended layer, the structure sheaf with
Connected respectively by adhering resin between top layer, barrier layer.It is furthermore preferred that the PE is compared with low-density (≤0.91g/cm3)
PE.Exxonmobil, DuPont, DOW trades mark 701,705,3165,3129,1881,1850 etc. may be selected.
Preferably, secondary internal layer is additionally provided between the hot sealing layer and barrier layer, the secondary internal layer is selected from polyethylene
(PE) layer, ethylene-vinyl acetate copolymer (EVA) layer, one or both of POP layers of blended layer, the secondary internal layer with
Connected between barrier layer by adhering resin.
Preferably, formed by PA6, copolymerization PA and unformed PA blendings for described top layer PA layers, unformed PA in resin
Mass percent is 10~30% (more preferably 20%), and the mass percent for being copolymerized PA (is more preferably for 10~60%
10%).
Preferably, the resin of the PA layers of the barrier layer protective layer is formed by PA6, copolymerization PA and unformed PA blendings,
The mass percent of unformed PA is not more than 40% in PA layers of resin.
Preferably, the PA, copolymerization PA, the relative viscosity 3.5-4.17 of unformed PA, density 1.12-1.19g/cm3。
Preferably, the hot sealing layer is the blended layer of POP and mLLDPE, and the content of POP is 30- wherein in hot sealing layer
90% (more preferably 50%).
Preferably, the film layer number of the heat shrink films suitable for the automatic fast package of production line is 4~11 layers.
Preferably, the gross thickness of the heat shrink films suitable for the automatic fast package of production line is (excellent for 40~100um
Select 75um).Wherein top layer accounts for the 5-15% of gross thickness, and barrier layer accounts for the 4-10% of gross thickness, and hot sealing layer accounts for the 18- of gross thickness
35%, structure sheaf accounts for the 30-50% of gross thickness.
Preferably, the heat shrink films：Longitudinal direction/lateral shrinkage 20-45 (90 DEG C), elongation 80-180, surface
36-40 dynes of power, heat play 80-90 DEG C of temperature of envelope, 90-220 DEG C of fusing point.
Preferably, opening agent is further included in the hot sealing layer, extexine further includes slipping agent.
In a preferred embodiment of the utility model, the heat shrink films include top layer successively from outside to inside
(PA), structure sheaf (PE), barrier layer (PA/EVOH/PA, including EVOH barrier intermediate layers and the barrier layer protective layers of both sides are PA
Layer), hot sealing layer (POP+mLLDPE).Pass through adhering resin respectively between the top layer, structure sheaf, barrier layer and hot sealing layer
(Tie) connect.
Specifically membrane structure is：PA/Tie/PE/Tie/PA/EVOH/PA/Tie/POP+mLLDPE；
Wherein top layer and PA two layers middle are formed using PA6, copolymerization PA and unformed PA blendings, in PA layers of resin
The mass percent for being copolymerized PA is 10%, and the content of hot sealing layer POP is 90%, overall film thickness 75um.
In other preferred embodiments of the utility model, the heat shrink films specific membrane structure choosing from outside to inside
From：
PA/Tie/PA/EVOH/PA/Tie/POP；
PA/Tie/PA/EVOH/PA/Tie/POP+mLLDPE；
PA/Tie/PE/Tie/EVOH/PA/Tie/mLLDPE；
PA/Tie/EVA/Tie/EVOH/PA/Tie/mLLDPE；
PA/Tie/EVOH/PA/Tie/POP；
PA/Tie/EVOH/PA/Tie/mLLDPE；
PA/Tie/EVOH/PA/Tie/POP+mLLDPE；
PA/Tie/EVA/Tie/PA/EVOH/PA/Tie/POP；
PA/Tie/EVA/Tie/PA/EVOH/PA/Tie/mLLDPE；
PA/Tie/EVA/Tie/PA/EVOH/PA/Tie/POP+mLLDPE；
PET/Tie/PE/Tie/PA/EVOH/PA/Tie/PE；
PET/Tie/PE/Tie/PA/EVOH/PA/Tie/POP；
PET/Tie/PE/Tie/PA/EVOH/PA/Tie/mLLDPE；
PET/Tie/PE/Tie/PA/EVOH/PA/Tie/POP+mLLDPE；
PET/Tie/PP/Tie/PA/EVOH/PA/Tie/PE；
PET/Tie/PP/Tie/PA/EVOH/PA/Tie/POP；
PET/Tie/PP/Tie/PA/EVOH/PA/Tie/mLLDPE；
PET/Tie/PP/Tie/PA/EVOH/PA/Tie/POP+mLLDPE；
PET/Tie/EVA/Tie/PA/EVOH/PA/Tie/PE；
PET/Tie/EVA/Tie/PA/EVOH/PA/Tie/POP；
PET/Tie/EVA/Tie/PA/EVOH/PA/Tie/mLLDPE；
PET/Tie/EVA/Tie/PA/EVOH/PA/Tie/POP+mLLDPE。
In a preferred embodiment of the utility model, the specific membrane structure of the heat shrink films is：
PA/Tie/EVA/Tie/PA/EVOH/PA/Tie/POP+mLLDPE。
A kind of third aspect of the utility model, there is provided heat receipts as described above suitable for the automatic fast package of production line
The production technology of contracting film, comprises the following steps：
Production technology, including the shaping of extrusion plasticizing, Multi-layer coextruding die head, cooling water quenching, the preheating of the first membrane tube, secondary blow
Swollen, traction, thermal finalization, traction, winding, in Multi-layer coextruding die head forming step to formed the PA resins of barrier layer protective layer plus
Hot temperature is 255~265 DEG C, and the temperature of cooling water is 5~15 DEG C in cooling water quenching fixating shape step.The POP and PE of hot sealing layer
Heating-up temperature be 220~230 DEG C.
Preferably, following steps are specifically included：
S1：Raw material is placed in co-extrusion in extruder and obtains membrane tube, to membrane tube cooling treatment；
S2：Membrane tube after cooling is heated to preheating temperature, membrane tube is stretched, is then carried out using compressed air secondary
Inflation；
S3：By packaging film feeding obtained by secondary inflation to shaping mechanism, it is again heated to setting temperature and shaping film is handled,
Obtain multi-layer co-extruded shrink film finished product.
Wherein, S1 coextruded films are from top to bottom extruded using water cooling, are realized that film is sudden cold, the generation of crystallization are controlled, with profit
In the orientation of molecule segment, the mist degree of film can be reduced.Preferably, the water-cooled process water temperature in S1 is 5~15 DEG C, flow velocity 20
~35L/min.
Preferably, preheating temperature is 30~80 DEG C in S2；The blow-up ratio of secondary inflation is 1.5~4, draw ratio for 2.5~
3.0.The blow-up ratio and draw ratio and the crystallinity of coextruded film in S1 of secondary inflation match.Blow-up ratio and draw ratio too great Rong
It is unstable to easily cause film bubble, and fold easily occurs in film；The shrinking percentage of too small then finished product is less than 30%, does not reach finished product packing
Requirement.
Preferably, setting temperature is 30~70 DEG C in S3.The styling of three bubbles can effectively suppress ordinary convergence film
Free shrink in storing process (at a temperature of storage environment, the natural disorientation of strand).
It is furthermore preferred that the water-cooled process water temperature in S1 is 10 DEG C, flow velocity is 20~30L/min.
Preheating temperature is 75 DEG C in S2；The blow-up ratio of secondary inflation is 3.0, draw ratio 3.0.
Setting temperature is 60 DEG C in S3.
Compared with prior art, the utility model advantages and beneficial effects are：
1st, the selection of heat-sealable material：Ability and heat-sealing Hot Tack strength are sealed to improve the antipollution of material, is made in hot sealing layer
With materials such as POP, ULDPE, SURLYN；Hot sealing layer employs density in 0.9g/cm3The PE hot sealing layers of left and right, or sarin heat-sealing
Layer.With excellent low temperature heat seal and efficient antipollution heat sealability.Play envelope temperature reduces 10-20 DEG C than conventional material.
Except low envelope temperature, it is also necessary to improve the heat seal strength rate of climb, i.e., in same temperature range, heat-sealing is strong
Degree increase is more.The material of usual low melting point have it is relatively low play envelope temperature, but its heat seal strength is accordingly weaker, it is quick from
During dynamic packaging, since material heated time is shorter, moment heat seal strength can not enough cause heat-sealing problem, therefore reduce
While having sealed envelope temperature, it is the big main points that this automatic packaging line application need to solve to improve heat seal strength.This practicality is new
Type does auxiliary heat-sealing by hot sealing layer and secondary internal layer, to reach the coordination of low envelope temperature and high heat-sealing strength.
2nd, film flatness：The pliability of film is controlled by the selection of structural material, using compared with low-density≤
0.91g/cm3PE, or the relatively soft material such as EVA is used in structure sheaf, makes it have preferable film flatness, flexibility.
3. the shrinkage of film：On the one hand controlled, on the other hand controlled by material, especially by process conditions
It is the shrinking percentage that PA layer materials can limit film, the slower PA materials of selective freezing, increase the ratio of copolymer nylon, addition is without fixed
Type nylon etc. improves the shrinking percentage of film.
The new heat shrink films of the utility model have the excellent properties high-barrier that contraction bag is possessed, high intensity, heat-sealing
Performance is good, at the same have it is excellent walk machine performance, suitable for automatically the bag of contraction bag will be changed in wire wrapping, the utility model
Dress mode and packaging efficiency.
Brief description of the drawings
Fig. 1 is the cross section structure schematic diagram of heat shrink films in embodiment 1.
Reference numeral and part involved in attached drawing is as follows：
1- top layers 2- structure sheafs
3- barrier layer 4- hot sealing layers
5- adhering resins 31-EVOH obstructs intermediate layer
32- barrier layer protective layers
Embodiment
Elaborate with reference to embodiment to embodiment provided by the utility model.
Embodiment 1
The heat shrink films include top layer 1 (PA), structure sheaf 2 (PE), 3 (PA/EVOH/ of barrier layer successively from outside to inside
PA, including EVOH barrier intermediate layer 31 and both sides barrier layer protective layer 32 be PA layers), hot sealing layer 4 (POP+mLLDPE).It is described
Top layer 1, structure sheaf 2, pass through adhering resin 5 (Tie) respectively between barrier layer 3 and hot sealing layer 4 and connect.
Specifically membrane structure is：PA/Tie/PE/Tie/PA/EVOH/PA/Tie/POP+mLLDPE；
Top layer 1 and PA two layers middle are formed using PA6, copolymerization PA and unformed PA blendings, in PA layers of resin altogether
The mass percent of poly- PA is 10%, and the content of hot sealing layer 4POP is 90%, overall film thickness 75um.PE is compared with low-density
(≤0.91g/cm3) PE.
Production technology comprises the following steps：
S1：Raw material is placed in co-extrusion in extruder and obtains membrane tube, to membrane tube cooling treatment；Water-cooled process water temperature in S1 is
10 DEG C, flow velocity is 20~30L/min.
S2：Membrane tube after cooling is heated to preheating temperature, membrane tube is stretched, is then carried out using compressed air secondary
Inflation；Preheating temperature is 75 DEG C in S2；The blow-up ratio of secondary inflation is 3.0, draw ratio 3.0.
S3：By packaging film feeding obtained by secondary inflation to shaping mechanism, it is again heated to setting temperature and shaping film is handled,
Obtain multi-layer co-extruded shrink film finished product.Setting temperature is 60 DEG C in S3.
Embodiment 2-4
Metallocene material mLLDPE is added in hot sealing layer, the difference with embodiment 1 is that the content of hot sealing layer POP is respectively
85%th, 70%, 50%.
Embodiment 5-8
Top layer and two layers of the PA in centre, in PA layers of resin the mass percent of copolymerization PA be respectively 20%, 30%, 40%,
50%.The blow-up ratio of secondary inflation is 2.0-4.5, draw ratio 3.0-3.5 in wherein S2.
Comparative example 1
Specifically membrane structure is：PA/Tie/PE/Tie/PA/EVOH/PA/Tie/PE.
Comparative example 2
Specifically membrane structure is：PA/Tie/PE/Tie/PA/EVOH/PA/Tie/POP.
The production craft step of comparative example 1-2 is same as Example 1, and top layer and PA two layers middle use PA6.
Embodiment 9
Performance detection contrasts：
The low temperature heat seal and shrinking percentage of embodiment 1-8 and comparative example 1-2 films are contrasted.
Embodiment 1-5 and comparative example 1-2 low temperature heat seals data (take 90 DEG C of heat-sealing temperature point value, 100 DEG C, 110 DEG C, 120
DEG C, 130 DEG C, 140 DEG C) see the table below 1,90 DEG C of shrinking percentage % of embodiment 1-8 and comparative example 1-2 see the table below 2：
Table 1
Table 2
| 90 DEG C of shrinking percentage % | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Comparative example 1 | Comparative example 2 |
| MD | 36.75 | 37.50 | 41.00 | 44.13 | 45.38 | 30.65 | 31.50 |
| TD | 36.65 | 37.50 | 37.88 | 42.75 | 43.88 | 30.55 | 30.85 |
2 (Continued) of table
| 90 DEG C of shrinking percentage % | Embodiment 6 | Embodiment 7 | Embodiment 8 |
| MD | 45.4 | 45.8 | 46.45 |
| TD | 44.12 | 44.57 | 45.53 |
(1) can see by comparative example 1 and 2, hot sealing layer list uses POP or mLLDPE, and film does not possess Low Temperature Thermal
The performance of envelope, and heat seal strength is not high in required temperature range.
(2) can see by comparative example 1 and 2 and embodiment 1, after PA layers add copolymerization PA and unformed PA, film
Percent thermal shrinkage be significantly improved.
(3) it can see by embodiment 5/6/7/8, by increasing the ratio of copolymerization PA, the heat receipts of film can be improved
Shrinkage.This is more mainly due to orientable random segment in copolymerization PA.
(4) can see by embodiment 3~4, auxiliary by POP and mLLDPE is matched somebody with somebody, and has good cooperative effect, both
Envelope temperature has been reduced, and has improved heat seal strength, has solved low envelope temperature, in same temperature range, heat seal strength
Increase the problem of more.
(5) by 1 comparative example 2 of embodiment 1 and comparative example, the addition of POP is so that the envelope temperature that rises of film reduces 20-40
DEG C, as the amount of mixing POP reduces mLLDPE increases, low-temperature heat-sealing intensity has been lifted.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
Art personnel, on the premise of the utility model principle is not departed from, can also make some improvement and supplement, these are improved and supplement
Also it should be regarded as the scope of protection of the utility model.
Claims (5)
- A kind of 1. heat shrink films suitable for the automatic fast package of production line, it is characterised in that including positioned at the top layer of outer surface, Positioned at the hot sealing layer of inner surface, and the barrier layer being arranged between top layer and hot sealing layer；The barrier layer includes one layer of EVOH Intermediate layer is obstructed, EVOH barriers intermediate layer at least side is equipped with one layer of barrier layer protective layer, barrier layer protection Layer is PA layers；The top layer is PA layers；The hot sealing layer is POP layers or mLLDPE layers, ULDPE layers, Surlyn resin beds In one kind, or the blended layer of POP and mLLDPE；Pass through respectively between the top layer and barrier layer, barrier layer and hot sealing layer Adhering resin connects.
- 2. the heat shrink films according to claim 1 suitable for the automatic fast package of production line, it is characterised in that described Be equipped with structure sheaf between top layer and barrier layer, the structure sheaf for one kind in PE layers, EVA layer, POP layers, PP layers or Two kinds of blended layer, is connected by adhering resin respectively between the structure sheaf and top layer, barrier layer.
- 3. the heat shrink films according to claim 1 suitable for the automatic fast package of production line, it is characterised in that described Secondary internal layer is additionally provided between hot sealing layer and barrier layer, the secondary internal layer is one kind or two in PE layers, EVA layer, POP layers The blended layer of kind, is connected between the secondary internal layer and barrier layer by adhering resin.
- 4. the heat shrink films according to claim 1 suitable for the automatic fast package of production line, it is characterised in that described Film layer number suitable for the heat shrink films of the automatic fast package of production line is 4~11 layers；Described is automatically fast suitable for production line The gross thickness of the heat shrink films of speed packaging is 40~100um.
- 5. the heat shrink films according to claim 1 suitable for the automatic fast package of production line, it is characterised in that described Include top layer PA, structure sheaf PE, barrier layer PA/ successively from outside to inside suitable for the heat shrink films of the automatic fast package of production line EVOH/PA, including PA layers of barrier layer protective layer, the hot sealing layer POP+mLLDPE of EVOH barrier intermediate layers and both sides；The table Connected respectively by adhering resin Tie between layer, structure sheaf, barrier layer and hot sealing layer；Specifically membrane structure is：PA/Tie/PE/Tie/PA/EVOH/PA/Tie/POP+mLLDPE.
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Cited By (5)
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| CN107696623A (en) * | 2017-10-19 | 2018-02-16 | 江阴升辉包装材料有限公司 | A kind of heat shrink films suitable for the automatic fast package of production line |
| CN109605891A (en) * | 2018-12-29 | 2019-04-12 | 无锡市太平洋新材料股份有限公司 | A kind of food packaging antifog film |
| CN110466225A (en) * | 2019-09-16 | 2019-11-19 | 福建立邦包装有限公司 | A kind of CPE heat-sealing composite membrane and preparation method thereof |
| CN111907177A (en) * | 2020-08-11 | 2020-11-10 | 佛山市南海利达印刷包装有限公司 | Recyclable composite packaging material, recyclable composite packaging bag and recycling method thereof |
| CN113352719A (en) * | 2021-06-10 | 2021-09-07 | 南通环球塑料工程有限公司 | Online forming shrinkage base film and cover film and preparation method thereof |
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2017
- 2017-10-19 CN CN201721367148.4U patent/CN207345171U/en active Active
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| CN107696623A (en) * | 2017-10-19 | 2018-02-16 | 江阴升辉包装材料有限公司 | A kind of heat shrink films suitable for the automatic fast package of production line |
| WO2019075775A1 (en) * | 2017-10-19 | 2019-04-25 | 江阴升辉包装材料有限公司 | Thermal shrinkage film suitable for automatic and quick packaging in production line |
| CN109605891A (en) * | 2018-12-29 | 2019-04-12 | 无锡市太平洋新材料股份有限公司 | A kind of food packaging antifog film |
| CN110466225A (en) * | 2019-09-16 | 2019-11-19 | 福建立邦包装有限公司 | A kind of CPE heat-sealing composite membrane and preparation method thereof |
| CN110466225B (en) * | 2019-09-16 | 2021-07-23 | 福建立邦包装有限公司 | CPE (chlorinated polyethylene) heat-sealing composite film and preparation method thereof |
| CN111907177A (en) * | 2020-08-11 | 2020-11-10 | 佛山市南海利达印刷包装有限公司 | Recyclable composite packaging material, recyclable composite packaging bag and recycling method thereof |
| CN113352719A (en) * | 2021-06-10 | 2021-09-07 | 南通环球塑料工程有限公司 | Online forming shrinkage base film and cover film and preparation method thereof |
| CN113352719B (en) * | 2021-06-10 | 2023-02-03 | 南通环球塑料工程有限公司 | Online forming shrinkage base film and cover film and preparation method thereof |
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Address after: No.2, Tonggang Road, Changjing Town, Jiangyin, Wuxi City, Jiangsu Province Patentee after: Shenghui new materials Co.,Ltd. Address before: No.2, Tonggang Road, Changjing Town, Jiangyin, Wuxi City, Jiangsu Province Patentee before: JIANGYIN SUNRISE PACKAGING MATERIAL Co.,Ltd. Address after: No.2, Tonggang Road, Changjing Town, Jiangyin, Wuxi City, Jiangsu Province Patentee after: Shenghui New Material Co.,Ltd. Address before: No.2, Tonggang Road, Changjing Town, Jiangyin, Wuxi City, Jiangsu Province Patentee before: Shenghui new materials Co.,Ltd. |