CN102615895A - POF thermal contraction film prepared in micro lamination technology and moulding method for same - Google Patents
POF thermal contraction film prepared in micro lamination technology and moulding method for same Download PDFInfo
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- CN102615895A CN102615895A CN2012100693684A CN201210069368A CN102615895A CN 102615895 A CN102615895 A CN 102615895A CN 2012100693684 A CN2012100693684 A CN 2012100693684A CN 201210069368 A CN201210069368 A CN 201210069368A CN 102615895 A CN102615895 A CN 102615895A
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Abstract
The invention discloses a POF thermal contraction film prepared in a micro lamination technology and a moulding method for the same. The POF thermal contraction film has a multi-layered alternative structure, and takes PP (Propene Polymer) and LLDPE (Linear low density polyethylene) as a base material, and two polymers are compounded alternatively through the micro lamination technology to obtain an alternative multi-layered POF thermal contraction film; the outer surface layer of the POF thermal contraction film is a PP layer; the PP layer and the LLDPE layer are alternatively distributed at the inner part of the POF thermal contraction film; the POF thermal contraction film has good mechanical strength and barrier performance; during moulding, PP and LLDPE are respectively added in two extruding machines for melting and plasticizing and then are combined into a melt at a junction station and the melt enters into a connection opening mould to be distributed; the multi-layer alternative structure is obtained after the melt passes through a lamination device and a moulding opening mould; and the POF thermal contraction film with the multi-layered structure is finally obtained through processes such as subsequent two-way stretch and the like. The method adopting a novel micro lamination technology has the advantages that the number of the extruding machines is decreased, so that the production cost is lowered, meanwhile, the flowing resistance of the melt is reduced and more benefits to industrial production are brought.
Description
Technical field
The present invention relates to a kind of POF heat shrink films preparation method, particularly relate to a kind of method for preparing the POF heat shrink films with the folded technology of microbedding.
Background technology
The POF heat shrink films is the abbreviation of bidirection stretching polyolefine shrink film; The New Plastic Packing Materials of system Italy the nineties in last century exploitation; Has international most advanced level; It is in special equipment with LLDPE (LLDPE) as the intermediate layer; Co-polypropylene (PP) is as inside and outside layer, through special process with interior, in, outer three layers of co-extruded and process have a good heat-shrinkable film of the high grade of transparency, high shrinkage and heat sealability, possessed all advantages and the strong point of LLDPE (LLDPE) and polypropylene (PP) simultaneously.It is to use extensively, develop novel environment friendly shrink film rapidly a kind of now in the world, product has that asepsis environment-protecting, the high grade of transparency, high shrinkage, good heat sealability, surface gloss height, good toughness, tearing toughness are big, thermal contraction evenly and be fit to characteristics such as fully automatic high-speed packing.
The POF heat shrink films has many application in developed country such as America and Europe and Southeast Asia at present, has domesticly just formed certain production scale, and 3 layers POF film is more, 5 layers even multilayer seldom, equipment is many by external import, costs an arm and a leg.
The folded technology of microbedding is meant the technology with the compound of two or more polymer coextrusion formation tens and even thousands of alternating layers; The thickness of the extruding layer that obtains can be micron order even nanoscale, and the alternative stacked composite of producing through this technology can obtain better mechanics, optics, gas barrier and electrical property etc.If can the folded technology of microbedding be introduced among the POF heat shrink films preparation technology, gained POF heat shrink films will have higher mechanical strength and barrier property, and can reduce production cost, certainly will have more wide development space.
Summary of the invention
The objective of the invention is to propose a kind of new method of suitable POF heat shrink films preparation; Can either save the production space through reducing extruder quantity; Thereby reduce production costs; And can further improve its mechanical strength, barrier property etc. through the POF heat shrink films number of plies that increases sharply, be applicable to suitability for industrialized production.
For realizing above-mentioned purpose, adopt following technical scheme: a kind of POF heat shrink films with the folded technology preparation of microbedding has the multilayer alternating structure; With PP and LLDPE is base material, alternately compound through adopting the folded technology of microbedding that two kinds of polymer are carried out, and passes through operations such as follow-up biaxial tension again; Obtain alternate multiple POF heat shrink films; Extexine is the PP layer, and inside is that PP layer and LLDPE layer alternately distribute, and has good mechanical strength and barrier property.
A kind of POF heat shrink films with the folded technology preparation of microbedding of the present invention, the number of plies of film is relevant with range upon range of device number m and layering unit number n, can be 2 * (3n)
m(n>=1) layer.
A kind of POF heat shrink films with the folded technology preparation of microbedding of the present invention, range upon range of device higher slice unit can evenly distribute, and also can be interspersed, and is the PP layer as long as guarantee extexine.
A kind of forming method with the folded technological POF heat shrink films for preparing of microbedding of the present invention is following:
1. PP and LLDPE are added respectively and carry out fusion plastification in the two extruders, two strands of materials merge into double-deck melt through different runners in junction station, and version is PP/LLDPE;
2. the melt of extruding from junction station gets into the connector mould, and is divided into four strands in connector mould exit;
3. the interior melt of connector mould gets into the layering unit flow passage of range upon range of device; Per share melt is divided into that trisection is shunted forward, rotation, broadening and merging; Wherein there is LLDPE opposite with other three plumes road direction of rotation in runner at outer field that strand melt; Make PP forward outermost layer to, and to merge into 2 * 4 * 3=24 layer version in range upon range of device exit be PP/LLDPE ... The melt of LLDPE/PP, the number of plies that this share split and five equilibrium mode reach is many; Connect the number of plies that a small amount of range upon range of device just can reach expectation, overcome the big deficiency of a plurality of range upon range of device series connection long runner total pressures of runner;
4.24 layer melt passes through operations such as follow-up biaxial tension after extruding through the molding port mould again, the final POF heat shrink films that includes sandwich construction that forms.This structure POF heat shrink films extexine is the PP layer, and inside is PP layer and LLDPE layer alternating structure, and better mechanical property and barrier property are arranged.
The present invention has the following advantages:
1. a kind of POF heat shrink films and forming method thereof with the folded technology preparation of microbedding of the present invention, it is multi-layer co-extruded to utilize the folded technology of microbedding that PP and LLDPE are carried out, and can obtain the POF heat shrink films of high strength, high barrier.
2. in the forming method of POF heat shrink films of the present invention, extrude the board number, saved the production space, thereby reduced production cost through adopting the folded technology of microbedding to reduce.
3. in the forming method of POF heat shrink films of the present invention, the folded technological layering efficient of the microbedding that adopts high, through on range upon range of device, increasing a plurality of layerings unit, thereby reduce the resistance in the melt flows process.
Description of drawings
Fig. 1 is a kind of section structure sketch map with the folded technological POF heat shrink films for preparing of microbedding of the present invention.
Fig. 2 is that the present invention is a kind of with melt layering sketch map in runner in the forming process of the folded technological POF heat shrink films for preparing of microbedding.
Fig. 3 is a kind of POF heat shrink films decker flow passage structure sketch map with the folded technology preparation of microbedding of the present invention.
Among the figure: the 1-POF heat shrink films; 1-1-PP; 1-2-LLDPE; Melt in the 2-connector mould; Melt in the range upon range of device of 3-; Melt in the 4-molding port mould.
The specific embodiment
As shown in Figure 1, a kind of POF heat shrink films of the present invention with the folded technology preparation of microbedding, POF heat shrink films 1 has the multilayer alternating structure; With PP1-1 and LLDPE1-2 is base material; Alternately compound through adopting the folded technology of microbedding that two kinds of polymer are carried out, pass through following process again, obtain alternating multilayered structure POF heat shrink films 1; Extexine is the PP1-1 layer; Inside is that PP1-1 layer and LLDPE1-2 layer alternately distribute, and compares with the POF heat shrink films of traditional structure, has better mechanical strength and barrier property etc.
The present invention invents a kind of POF heat shrink films with the folded technology preparation of microbedding, and the number of plies of POF heat shrink films 1 is relevant with range upon range of device higher slice unit number n, can be 2 * (3n)
m(n>=1) layer, m is the number of range upon range of device, m>=1.
In a kind of forming method with the folded technological POF heat shrink films for preparing of microbedding of the present invention, range upon range of device higher slice unit can evenly distribute, and also can be interspersed, and is the PP layer as long as guarantee extexine.
A kind of forming method with the folded technological POF heat shrink films for preparing of microbedding of the present invention is following:
1. PP1-1 (A) and LLDPE1-2 (B) are added respectively and carry out fusion plastification in the two extruders, two strands of materials merge into double-deck melt through different runners in junction station, and version is A/B;
2. the melt of extruding from junction station gets into the connector mould, and is divided into four strands in connector mould exit;
3. the interior melt 2 of connector mould gets into the layering unit flow passage of range upon range of device; Per share melt is divided into that trisection is shunted forward, rotation, broadening and merging; Wherein there is LLDPE opposite with other three plumes road direction of rotation in runner at outer field that strand melt; Make PP forward outermost layer to, and to merge into 2 * 4 * 3=24 layer version in range upon range of device exit be A/B ... Melt 3 in the range upon range of device of B/A.
4. after melt 3 gets into and forms the interior melt 4 of molding port mould in the molding port mould in the range upon range of device, pass through following process again, the final POF heat shrink films 1 that includes sandwich construction that forms.This structure POF heat shrink films extexine is the PP1-1 layer, and inside is PP1-1 layer and LLDPE1-2 layer alternating structure, and better mechanical property and barrier property are arranged.
Utilize the new method of the present invention with the folded technology preparation of microbedding POF heat shrink films; Select for use PP as the extexine material, carry out coextrusion with LLDPE through the folded technology of microbedding, processing temperature is set at 180 ℃; Range upon range of device joint number is elected 2 joints as; Layering unit number is 6, and other technologies are identical with traditional handicraft, and the POF heat shrink films number of plies N=that finally obtains is 2 * (3 * 6)
2=648 layers, thickness is 30 μ m, and so every layer thickness is 46nm, and the POF heat shrink films of this structure has better mechanical property and barrier property, more is applicable to packaging material.
Claims (2)
1. POF heat shrink films with the folded technology preparation of microbedding; It is characterized in that: having the multilayer alternating structure, is base material with PP and LLDPE, carries out two kinds of polymer alternately compound through adopting the folded technology of microbedding; Pass through operations such as follow-up biaxial tension again; Obtain alternate multiple POF heat shrink films, extexine is the PP layer, and inside is that PP layer and LLDPE layer alternately distribute.
2. the forming method of the described a kind of POF heat shrink films with the folded technology preparation of microbedding of claim 1 is characterized in that:
The first step adds PP and LLDPE respectively and to carry out fusion plastification in the two extruders, and two strands of materials merge into double-deck melt through different runners in junction station, and version is PP/LLDPE;
In second step, the melt of extruding from junction station gets into the connector mould, and is divided into four strands in connector mould exit;
The 3rd step; Melt gets into the layering unit flow passage of range upon range of device in the connector mould; Per share melt is divided into that trisection is shunted forward, rotation, broadening and merging; Wherein have LLDPE opposite with other three plumes road direction of rotation in runner, make PP forward outermost layer to, and to merge into 20 four-layer structure forms in range upon range of device exit be PP/LLDPE at outer field that strand melt ... The melt of LLDPE/PP;
In the 4th step, after 24 layers of melt are extruded through the molding port mould, pass through operations such as follow-up biaxial tension again, the final POF heat shrink films that includes sandwich construction that forms.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100693684A CN102615895A (en) | 2012-03-15 | 2012-03-15 | POF thermal contraction film prepared in micro lamination technology and moulding method for same |
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| CN2012100693684A CN102615895A (en) | 2012-03-15 | 2012-03-15 | POF thermal contraction film prepared in micro lamination technology and moulding method for same |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100227136A1 (en) * | 2009-03-06 | 2010-09-09 | Cryovac, Inc. | Multilayer, Heat-Shrinkable Film Comprising a Plurality of Microlayers |
| CN101947841A (en) * | 2010-08-06 | 2011-01-19 | 北京化工大学 | Device and method for preparing micro-nano laminated composite material with high barrier proper |
| CN202480502U (en) * | 2012-03-15 | 2012-10-10 | 北京化工大学 | Plastic optical fiber (POF) heat shrinkable film prepared by using micro-laminating technology |
-
2012
- 2012-03-15 CN CN2012100693684A patent/CN102615895A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100227136A1 (en) * | 2009-03-06 | 2010-09-09 | Cryovac, Inc. | Multilayer, Heat-Shrinkable Film Comprising a Plurality of Microlayers |
| CN101947841A (en) * | 2010-08-06 | 2011-01-19 | 北京化工大学 | Device and method for preparing micro-nano laminated composite material with high barrier proper |
| CN202480502U (en) * | 2012-03-15 | 2012-10-10 | 北京化工大学 | Plastic optical fiber (POF) heat shrinkable film prepared by using micro-laminating technology |
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Application publication date: 20120801 |