CN101607459B - BOPET film capable of being directly heat-sealed - Google Patents
BOPET film capable of being directly heat-sealed Download PDFInfo
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- CN101607459B CN101607459B CN2008100535631A CN200810053563A CN101607459B CN 101607459 B CN101607459 B CN 101607459B CN 2008100535631 A CN2008100535631 A CN 2008100535631A CN 200810053563 A CN200810053563 A CN 200810053563A CN 101607459 B CN101607459 B CN 101607459B
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- B29C47/92—
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- Laminated Bodies (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to a BOPET film capable of being directly heat-sealed, which consists of a surface heat-sealing layer, a sandwich layer and a bottom layer, wherein the surface heat-sealing layer comprises the following components in percentage by weight: 85 percent of copolyester PETG, and 15 percent of silicon masterbatch; the sandwich layer comprises the following components in percentage by weight: 80 percent of PET light material, and 20 percent of PET regenerated granules, or 85 percent of PET light material, and 15 percent of PET regenerated granules; and the bottom layer comprises the following components in percentage by weight: 100 percent of anti-adhesive silicon masterbatch. The surface heat-sealing layer of the film has lower melting point; the heat sealing temperature is 130 DEG C or so after the folding; the heat-sealing temperature of the film is equivalent to those (between 120 and 140 DEG C) of heat-sealing layer materials which are commonly used in soft packaging industry such as CPP, PE and the like; main technical indexes have already reached the level of similar products abroad; and the heat-sealing strength of the film is superior to those of BOPET films with the same specification abroad. In addition, the film is applicable for the mass production by the prior three-runner three-layer coextrusion and bidirectional stretching equipment, and has the outstanding advantages of low investment and steady quality.
Description
Technical field
The invention belongs to polyester film, particularly relate to and a kind ofly can directly seal the BOPET film.
Background technology
Biaxially oriented polyester film (BOPET) has excellent performance, big as hot strength, deflection good, good hygroscopicity, dimensional stability is good, gas permeability is little, good insulation preformance, good in optical property etc., this makes it use all very extensive in fields such as industrial, civilian, agriculturals.
The application of PET film at present mainly concentrates on fields such as packing, decoration, adhesive tape, tape matrix, film, electrically insulating material, translucent drawing paper.Yet because the PET strand itself is rigidity, the thermal finalization in the production process makes that its degree of crystallinity is high and cause fusing point than higher in addition, so BOPET film self can not heat-seal bond, has limited the direct use of BOPET film to a great extent.
Up to now, the major vendor that can produce heat-sealing BOPET film abroad has the SKC etc. of eastern beautiful, the Korea S of the Du Pont of the U.S., Japan, but their technology is also unexposed.Domestic concern to heat sealability BOPET film starts from 2004, up to the present, existing a small amount of unit can producing country outside existing like product, the heat-seal bond performance of product self is basic identical, but the technology of domestic constituent parts is also unexposed.
Summary of the invention
The objective of the invention is to disclose and a kind ofly can directly seal the BOPET film, being beneficial to this film can use in a large amount of production of China.
BOPET film of the present invention is made of surface heat seal, sandwich layer and bottom, the weight percent of described surface heat seal consists of copolyesters PETG 85%-90%, silicon original material 10%-15%, the weight percent of described sandwich layer consists of PET light material 80%-85%, PET reproduces a 15%-20%, and the weight percent of described bottom consists of the anti-stick silicon original material 100% that connects.The more excellent technical scheme of the present invention has following two:
1. the weight percent of described surface heat seal consists of copolyesters PETG 85%, silicon original material 15%, and the weight percent of described sandwich layer consists of PET light material 80%, and PET reproduces grain 20%, and the weight percent of described bottom consists of the anti-stick silicon original material 100% that connects.
2. the weight percent of described surface heat seal consists of copolyesters PETG 90%, silicon original material 10%, and the weight percent of described sandwich layer consists of PET light material 85%, and PET reproduces grain 15%, and the weight percent of described bottom consists of the anti-stick silicon original material 100% that connects.
The copolyesters PETG of surface heat seal of the present invention has introduced the 3rd monomer in polymerization, cause the regularity of strand to descend, cause the crystallization degree of copolyesters to reduce greatly, the surface heat seal is difficult for crystallization when sealing under certain temperature and pressure, strand has higher motility, the strand of two hot sealing layers moves mutually, winding and weave in, finally shows as the film heat-sealing.
Beneficial effect of the present invention and advantage are: the surface heat seal fusing point of this BOPET film is lower, doubling post heat-seal temperature is about 130 ℃, suitable with the hot sealing layer material that often uses in the flexible package industry such as CPP, PE heat-sealing temperature (120 ~ 140 ℃), and its heat seal strength is better than external same specification BOPET film.
The key technical indexes of this BOPET film is as shown in the table with external sample comparative result:
By table as seen, the key technical indexes of this BOPET film has reached the level of external like product.
In addition, this BOPET film is applicable to that the three-layer co-extruded and biaxial tension equipment of existing three runners carries out large-scale production, has little, the stay-in-grade outstanding advantage of investment.
The specific embodiment
Embodiment 1
Get the raw materials ready: the surface heat seal, copolyesters PETG 85%, silicon original material 15% evenly mixes.Sandwich layer, PET light material 80%, PET reproduce grain 20%, evenly mix.Bottom, silicon original material 100%.
The sandwich layer material crystal is dry to be handled: for avoiding melt extruding PET degraded in the process, the raw material of sandwich layer is carried out crystallizing and drying handle, and 150 ℃ of its crystallization temperatures, 160 ℃ of baking temperatures are no less than 6 hours drying time.
Surface heat seal and bottom adopt the twin-screw vavuum pump to get rid of moisture.
Melt extrude: three-layer co-extruded, wherein main extruder carries out extruding of sandwich layer material, and two is the auxilliary extruder of twin-screw with vacuum exhaust function in addition, carries out extruding of surface heat seal and bottom material respectively.Surface heat seal material extrusion temperature is 230 ~ 270 ℃.The temperature control of measuring pump, filter and melt pipe is at 270 ~ 280 ℃.Die head casting sheet: enter die head after the fusion of three layers of melts process, the filtration and be extruded, carry out moulding casting sheet.Die head temperature is 270 ℃, and casting sheet cold-roll temperature is 30 ℃.
Longitudinal stretching: behind the die head casting sheet, enter longitudinal stretching machine, the longitudinal stretching temperature is 75 ℃ ~ 80 ℃, and draw ratio is 3 ~ 3.5 times.
Cross directional stretch: the casting sheet enters cross directional stretch behind longitudinal stretching, draft temperature is 90 ~ 100 ℃, and draw ratio is 3 ~ 3.5 times, and setting temperature is 230 ~ 235 ℃, and chilling temperature is 100 ~ 120 ℃.
Traction rolling: behind the film forming, draw and rolling.In the Traction Station, bottom is carried out sided corona treatment.
Embodiment 2
Get the raw materials ready: the surface heat seal, copolyesters PETG 90%, silicon original material 10% evenly mixes.Sandwich layer, PET light material 85%, PET reproduce grain 15%, evenly mix.Bottom, silicon original material 100%.
All the other steps are identical with embodiment 1.
Claims (2)
1. can directly seal the BOPET film, it is characterized in that: the BOPET film is made of surface heat seal, sandwich layer and bottom, the weight percent of described surface heat seal consists of copolyesters PETG 85%, silicon original material 15%, the weight percent of described sandwich layer consists of PET light material 80%, PET reproduces grain 20%, and the weight percent of described bottom consists of the anti-stick silicon original material 100% that connects
。
2. can directly seal the BOPET film, it is characterized in that: the BOPET film is made of surface heat seal, sandwich layer and bottom, the weight percent of described surface heat seal consists of copolyesters PETG 90%, silicon original material 10%, the weight percent of described sandwich layer consists of PET light material 85%, PET reproduces grain 15%, and the weight percent of described bottom consists of the anti-stick silicon original material 100% that connects
。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100535631A CN101607459B (en) | 2008-06-19 | 2008-06-19 | BOPET film capable of being directly heat-sealed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100535631A CN101607459B (en) | 2008-06-19 | 2008-06-19 | BOPET film capable of being directly heat-sealed |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101607459A CN101607459A (en) | 2009-12-23 |
| CN101607459B true CN101607459B (en) | 2013-08-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100535631A Active CN101607459B (en) | 2008-06-19 | 2008-06-19 | BOPET film capable of being directly heat-sealed |
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| CN (1) | CN101607459B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102873954B (en) * | 2012-09-29 | 2015-08-19 | 浙江强盟实业股份有限公司 | A kind of polyester film that can directly seal and preparation method |
| CN105252753B (en) * | 2014-07-18 | 2017-10-31 | 天津万华股份有限公司 | Prepared without antimony type biaxially oriented polyester film |
| CN104191777A (en) * | 2014-08-19 | 2014-12-10 | 天津博苑高新材料有限公司 | PET (polyethylene terephthalate)/PETG (polyethylene terephthlate glycol-modified) co-extrusion transparent film with digital printing function |
| CN105437694B (en) * | 2016-01-15 | 2018-09-11 | 河南银金达新材料股份有限公司 | A kind of heat-shrinkable E-PET composite membranes and its manufacturing method |
| CN106142785B (en) * | 2016-06-29 | 2019-07-05 | 安徽国风塑业股份有限公司 | A kind of dry plate composite bidirectional stretching polyester film and preparation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1660568A (en) * | 2004-02-24 | 2005-08-31 | 上海紫东化工塑料有限公司 | Sub-smooth type polyester film at least in single side and fabricating method |
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2008
- 2008-06-19 CN CN2008100535631A patent/CN101607459B/en active Active
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| Publication number | Publication date |
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| CN101607459A (en) | 2009-12-23 |
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Application publication date: 20091223 Assignee: Tianjin Huaxin Yingju Polyester Material Science & Technology Co., Ltd. Assignor: Tianjin Wanhua Co., Ltd. Contract record no.: 2014120000121 Denomination of invention: BOPET film capable of being directly heat-sealed Granted publication date: 20130828 License type: Exclusive License Record date: 20141226 |
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| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model |