CN103818083A - Pure PE three-layer plastic film, corner angle packaging bag prepared therefrom, and production method of the film - Google Patents
Pure PE three-layer plastic film, corner angle packaging bag prepared therefrom, and production method of the film Download PDFInfo
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- CN103818083A CN103818083A CN201410053594.2A CN201410053594A CN103818083A CN 103818083 A CN103818083 A CN 103818083A CN 201410053594 A CN201410053594 A CN 201410053594A CN 103818083 A CN103818083 A CN 103818083A
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- density polyethylene
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Abstract
The invention relates to the technical field of plastic film manufacture, and specifically relates to a pure PE three-layer plastic film. The film comprises an outer layer, a middle layer, and an inner layer; wherein the outer layer is composed of the following raw materials in percentage by weight: 78 to 90% of metallocene, 6 to 15% of low density polyethylene, 3 to 5.5% of high density polyethylene, and 0.8 to 3.2% of slipping agent; the middle layer is composed of the following raw materials in percentage by weight: 70 to 85% of metallocene, 12 to 25% of low density polyethylene, 2 to 5% of high density polyethylene, and 0.8 to 2.5% of slipping agent; and the inner layer is composed of the following raw materials in percentage by weight: 70 to 85% of metallocene, 12 to 25% of low density polyethylene, and 1 to 5% of slipping agent. On the premise that the hardness and strength of plastic film are not influenced, the corner heat-seal distances of a packaging bag made of the PE three-layer plastic film in four corners can be controlled within 5 millimeters, thus the shortage of conventional PE industry is overcome; the four-edge sealed bag has not been applied to the PE industry yet and is mostly applied to the field of composite films; the production technology is simplified, and the packaging cost of composite film factories is greatly reduced on the basis that the beautiful appearance of external package bag is not influenced.
Description
[technical field]
The present invention relates to plastic sheeting manufacturing technology field, specifically a kind of pure PE three-layer plastic film, corner angle packaging bag prepared therefrom and production method thereof.
[background technology]
The technological process of production of plastic sheeting is: the resin raw material of supplying with in from hopper to cylinder is by heater heating and melting, and PE resin is extruded blowing up and become the shape of film by continuous to crosshead, die head by screw rod.At present, use pure PE plastic pellet, be blow molded into plastic sheeting, while making product external packaging bag, film is all very soft, and this packaging bag does not have corner angle when folding, and outward appearance is not attractive in appearance.That now sees on the market has a product plastic packaging bag that corner angle are attractive in appearance, all for example, for composite plastic film (: CPP and PE are compound etc.) makes, from machining angle, joint product uses adhesive, cost is high, more not environmental protection, adhesion phenomenon while there is outside heat-sealing while using pure PE plastic packaging bag in the time of heat-sealing, affects attractive in appearance.
[summary of the invention]
Object of the present invention is exactly to solve above-mentioned deficiency, and provide a kind of pure PE three-layer plastic film, corner angle packaging bag prepared therefrom and production method thereof, the external packing sack that utilizes this pure PE single layer plastics films to make, produce simple and easy, when folding, have corner angle, can erect station and put, directly increase third dimension and the aesthetic feeling of packaging bag.
Design for achieving the above object a kind of pure PE three-layer plastic film, described film comprises skin, intermediate layer and internal layer, described skin comprises the raw material of following percentage by weight: metallocene 78-90%, low density polyethylene (LDPE) 6-15%, high density polyethylene (HDPE) 3-5.5%, slipping agent 0.8-3.2%, described intermediate layer comprises the raw material of following percentage by weight: metallocene 70-85%, low density polyethylene (LDPE) 12-25%, high density polyethylene (HDPE) 2-5%, slipping agent 0.8-2.5%, described internal layer comprises the raw material of following percentage by weight: metallocene 70-85%, low density polyethylene (LDPE) 12-25%, slipping agent 1-5%.
Described skin comprises the raw material of following percentage by weight: metallocene 84%, low density polyethylene (LDPE) 9.5%, high density polyethylene (HDPE) 4.5%, slipping agent 2%, described intermediate layer comprises the raw material of following percentage by weight: metallocene 78%, low density polyethylene (LDPE) 17%, high density polyethylene (HDPE) 3.5%, slipping agent 1.5%, described internal layer comprises the raw material of following percentage by weight: metallocene 79%, low density polyethylene (LDPE) 19%, slipping agent 2%.
A kind of pure PE three-layer plastic film corner angle packaging bag, described packaging bag is used pure PE three-layer plastic film to make, after described packaging bag is folding, produce corner angle, described pure PE three-layer plastic film comprises skin, intermediate layer and internal layer, described skin comprises the raw material of following percentage by weight: metallocene 78-90%, low density polyethylene (LDPE) 6-15%, high density polyethylene (HDPE) 3-5.5%, slipping agent 0.8-3.2%, described intermediate layer comprises the raw material of following percentage by weight: metallocene 70-85%, low density polyethylene (LDPE) 12-25%, high density polyethylene (HDPE) 2-5%, slipping agent 0.8-2.5%, described internal layer comprises the raw material of following percentage by weight: metallocene 70-85%, low density polyethylene (LDPE) 12-25%, slipping agent 1-5%.
Described skin comprises the raw material of following percentage by weight: metallocene 84%, low density polyethylene (LDPE) 9.5%, high density polyethylene (HDPE) 4.5%, slipping agent 2%, described intermediate layer comprises the raw material of following percentage by weight: metallocene 78%, low density polyethylene (LDPE) 17%, high density polyethylene (HDPE) 3.5%, slipping agent 1.5%, described internal layer comprises the raw material of following percentage by weight: metallocene 79%, low density polyethylene (LDPE) 19%, slipping agent 2%.
The corner heat-sealing distance of described packaging bag four banding edges and corners is in 5mm, and described packaging bag four banding edges and corners are point-like or netted.
The production method of a kind of pure PE three-layer plastic film corner angle packaging bag, comprise the following steps: by above-mentioned skin, intermediate layer, the PE raw material of internal layer mixes in proportion on mixer, also jointly extrude by three extruder heating, while extruding, be pulled into tubular film by suitable air quantity blowing up, be cut into sheet film rolling film forming volume through limit cutting knife again, be converted into the quadrangle cylinder film with knuckle according to size by angle folding die, then through heat-sealing Bag Making Machine, its four limit is sealed, heat-sealing distance is in 5mm, the heat-sealing of final cutting bottom forms pocket.
The present invention compared with the existing technology, there is following beneficial effect: this pure PE three-layer plastic film is to use three layers of blowing of pure PE plastic pellet to form, the external packing sack that utilizes this pure PE three-layer plastic film to make, when folding, have corner angle, outward appearance is more attractive in appearance, can erect station puts, third dimension and the aesthetic feeling of packaging bag are directly increased, break through the drawback of conventional P E industry, four edge sealing bags do not touch PE industry so far, major part applies to composite membrane, thereby simplify production technology, in guaranteeing that outer packaging bag is attractive in appearance, can greatly reduce the packing cost that uses composite membrane producer, in addition, this pure PE three-layer plastic film is guaranteeing under the prerequisite of plastic sheeting firmness, intensity, can make the corner heat-sealing of packaging bag four banding edges and corners only have in 5 millimeters apart from controlling to have reached, and the now corner heat-sealing of the external packing four banding edges and corners of composite plastic film is on the market all more than 5 millimeters, and four banding edges and corners can make any shapes such as point-like, net be strong.
[specific embodiment]
Below in conjunction with embodiment, the invention will be further described:
Pure PE three-layer plastic film of the present invention, this film comprises skin, intermediate layer and internal layer, outer field raw materials for production are metallocene, low density polyethylene (LDPE), high density polyethylene (HDPE) and slipping agent, the raw materials for production in intermediate layer are metallocene, low density polyethylene (LDPE), high density polyethylene (HDPE), slipping agent, and the raw materials for production of internal layer are metallocene, low density polyethylene (LDPE) and slipping agent, use this pure PE three-layer plastic film to make the packaging bag of pure PE three-layer plastic film corner angle, after this packaging bag is folding, produce corner angle, the corner heat-sealing distance of these packaging bag four banding edges and corners is in 5mm, and packaging bag four banding edges and corners are point-like or netted, the production method of this packaging bag is by the skin of the colorful film (pure PE three-layer plastic film described above) of printing, intermediate layer, the PE raw material of internal layer mixes in proportion on mixer, also jointly extrude by three extruder heating, while extruding, be pulled into tubular film by suitable air quantity blowing up, be cut into sheet film rolling film forming volume through limit cutting knife again, be converted into the quadrangle cylinder film with knuckle according to size by angle folding die, then through heat-sealing Bag Making Machine, its four limit is sealed, heat-sealing distance is in 5mm, the heat-sealing of final cutting bottom forms pocket.
The present invention is in order to solve existing issue, by improving composition of raw materials design, use the blowing of pure PE plastic pellet, recycle this pure PE three-layer plastic film and make external packing sack, its technological process is: processing, fine finishining bag, fine finishining flanging and fine finishining bag are processed, cut in raw material mediation, film production, coating.When not only having guaranteed film firmness after pure PE plastic blow molding, intensity, the corner heat-sealing distance of four banding edges and corners of plastic film packaging thing is controlled to have reached only has 5 millimeters with interior (corner of the external packing four banding edges and corners of composite plastic film on the market seals all more than 5 millimeters now), and four banding edges and corners can make point-like, any shape such as netted.
In the present invention, its formulation principle is that the transfer mode that is temperature according to heat-sealing principle designs, three-layer thin-film altogether, divide skin, intermediate layer, internal layer, heat-sealable way is that outer heating pressurization makes internal layer heat-sealing reach intensity and skin does not melt, when design film, skin to internal layer density from high to low, accepting heat-sealing temperature is also from high to low, more than formula is exactly to use this design principle, when guaranteeing internal layer membrane heat seal strength, also guarantee (not the melting) attractive in appearance of outer membrane, thereby arrive the object of design.Its objective is the drawback that breaks through PE industry, four edge sealing bags do not touch PE industry so far, and major part applies to composite membrane, thereby simplify production technology, in guaranteeing that outer packaging bag is attractive in appearance, can greatly reduce the packing cost that uses composite membrane producer.
Embodiment 1
Pure PE three-layer plastic film of the present invention, its skin comprises the raw material of following percentage by weight: metallocene 84%, low density polyethylene (LDPE) 9.5%, high density polyethylene (HDPE) 4.5%, slipping agent 2%, intermediate layer comprises the raw material of following percentage by weight: metallocene 78%, low density polyethylene (LDPE) 17%, high density polyethylene (HDPE) 3.5%, slipping agent 1.5%, internal layer comprises the raw material of following percentage by weight: metallocene 79%, low density polyethylene (LDPE) 19%, slipping agent 2%.
Embodiment 2
Pure PE three-layer plastic film of the present invention, its skin comprises the raw material of following percentage by weight: metallocene 78%, low density polyethylene (LDPE) 15%, high density polyethylene (HDPE) 5.5%, slipping agent 1.5%, intermediate layer comprises the raw material of following percentage by weight: metallocene 70%, low density polyethylene (LDPE) 25%, high density polyethylene (HDPE) 4.2%, slipping agent 0.8%, internal layer comprises the raw material of following percentage by weight: metallocene 70%, low density polyethylene (LDPE) 25%, slipping agent 5%.
Embodiment 3
Pure PE three-layer plastic film of the present invention, its skin comprises the raw material of following percentage by weight: metallocene 90%, low density polyethylene (LDPE) 6%, high density polyethylene (HDPE) 3%, slipping agent 1%, intermediate layer comprises the raw material of following percentage by weight: metallocene 85%, low density polyethylene (LDPE) 12%, high density polyethylene (HDPE) 2%, slipping agent 1%, internal layer comprises the raw material of following percentage by weight: metallocene 85%, low density polyethylene (LDPE) 12%, slipping agent 3%.
Embodiment 4
Pure PE three-layer plastic film of the present invention, its skin comprises the raw material of following percentage by weight: metallocene 90%, low density polyethylene (LDPE) 6%, high density polyethylene (HDPE) 3.2%, slipping agent 0.8%, intermediate layer comprises the raw material of following percentage by weight: metallocene 80%, low density polyethylene (LDPE) 12.5%, high density polyethylene (HDPE) 5%, slipping agent 2.5%, internal layer comprises the raw material of following percentage by weight: metallocene 85%, low density polyethylene (LDPE) 14%, slipping agent 1%.
The present invention is not subject to the restriction of above-mentioned embodiment, and other any do not deviate from change, the modification done under Spirit Essence of the present invention and principle, substitutes, combination, simplify, and all should be equivalent substitute mode, within being included in protection scope of the present invention.
Claims (6)
1. a pure PE three-layer plastic film, it is characterized in that, described film comprises skin, intermediate layer and internal layer, described skin comprises the raw material of following percentage by weight: metallocene 78-90%, low density polyethylene (LDPE) 6-15%, high density polyethylene (HDPE) 3-5.5%, slipping agent 0.8-3.2%, described intermediate layer comprises the raw material of following percentage by weight: metallocene 70-85%, low density polyethylene (LDPE) 12-25%, high density polyethylene (HDPE) 2-5%, slipping agent 0.8-2.5%, described internal layer comprises the raw material of following percentage by weight: metallocene 70-85%, low density polyethylene (LDPE) 12-25%, slipping agent 1-5%.
2. pure PE three-layer plastic film as claimed in claim 1, it is characterized in that, described skin comprises the raw material of following percentage by weight: metallocene 84%, low density polyethylene (LDPE) 9.5%, high density polyethylene (HDPE) 4.5%, slipping agent 2%, described intermediate layer comprises the raw material of following percentage by weight: metallocene 78%, low density polyethylene (LDPE) 17%, high density polyethylene (HDPE) 3.5%, slipping agent 1.5%, described internal layer comprises the raw material of following percentage by weight: metallocene 79%, low density polyethylene (LDPE) 19%, slipping agent 2%.
3. pure PE three-layer plastic film corner angle packaging bag, it is characterized in that, described packaging bag is used pure PE three-layer plastic film to make, after described packaging bag is folding, produce corner angle, described pure PE three-layer plastic film comprises skin, intermediate layer and internal layer, described skin comprises the raw material of following percentage by weight: metallocene 78-90%, low density polyethylene (LDPE) 6-15%, high density polyethylene (HDPE) 3-5.5%, slipping agent 0.8-3.2%, described intermediate layer comprises the raw material of following percentage by weight: metallocene 70-85%, low density polyethylene (LDPE) 12-25%, high density polyethylene (HDPE) 2-5%, slipping agent 0.8-2.5%, described internal layer comprises the raw material of following percentage by weight: metallocene 70-85%, low density polyethylene (LDPE) 12-25%, slipping agent 1-5%.
4. pure PE three-layer plastic film corner angle as claimed in claim 3 packaging bag, it is characterized in that, described skin comprises the raw material of following percentage by weight: metallocene 84%, low density polyethylene (LDPE) 9.5%, high density polyethylene (HDPE) 4.5%, slipping agent 2%, described intermediate layer comprises the raw material of following percentage by weight: metallocene 78%, low density polyethylene (LDPE) 17%, high density polyethylene (HDPE) 3.5%, slipping agent 1.5%, described internal layer comprises the raw material of following percentage by weight: metallocene 79%, low density polyethylene (LDPE) 19%, slipping agent 2%.
5. pure PE three-layer plastic film corner angle as claimed in claim 3 packaging bag, is characterized in that: the corner heat-sealing distance of described packaging bag four banding edges and corners is in 5mm, and described packaging bag four banding edges and corners are point-like or netted.
6. the production method of pure PE three-layer plastic film corner angle packaging bag, it is characterized in that, comprise the following steps: by the skin described in any one in claim 3-5, intermediate layer, the PE raw material of internal layer mixes in proportion on mixer, also jointly extrude by three extruder heating, while extruding, be pulled into tubular film by suitable air quantity blowing up, be cut into sheet film rolling film forming volume through limit cutting knife again, be converted into the quadrangle cylinder film with knuckle according to size by angle folding die, then through heat-sealing Bag Making Machine, its four limit is sealed, heat-sealing distance is in 5mm, the heat-sealing of final cutting bottom forms pocket.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410053594.2A CN103818083B (en) | 2014-02-17 | 2014-02-17 | Pure PE three-layer plastic film, corner angle packing bag prepared therefrom and production method thereof |
| JP2015562773A JP6306066B2 (en) | 2014-02-17 | 2015-01-27 | Square standing packaging bag |
| PCT/JP2015/052138 WO2015122269A1 (en) | 2014-02-17 | 2015-01-27 | Sharp-cornered packaging bag and manufacturing method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410053594.2A CN103818083B (en) | 2014-02-17 | 2014-02-17 | Pure PE three-layer plastic film, corner angle packing bag prepared therefrom and production method thereof |
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| CN103818083A true CN103818083A (en) | 2014-05-28 |
| CN103818083B CN103818083B (en) | 2016-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410053594.2A Active CN103818083B (en) | 2014-02-17 | 2014-02-17 | Pure PE three-layer plastic film, corner angle packing bag prepared therefrom and production method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105713241A (en) * | 2016-04-15 | 2016-06-29 | 上海福助工业有限公司 | Biodegradable thermoplastic starch resin film and preparation method thereof |
| CN106626636A (en) * | 2016-12-01 | 2017-05-10 | 成泰昌包装制品(深圳)有限公司 | High-strength packaging film |
| CN106829170A (en) * | 2017-02-10 | 2017-06-13 | 嘉兴乾昆工业设计有限公司 | A kind of moistureproof rice package bag and its processing technology |
| CN106829167A (en) * | 2017-02-10 | 2017-06-13 | 嘉兴乾昆工业设计有限公司 | One kind separates composite lights face-connected film bag |
| CN109435403A (en) * | 2018-12-28 | 2019-03-08 | 大连大富塑料彩印有限公司 | A kind of puncture resistance composite membrane |
| CN110979956A (en) * | 2019-12-11 | 2020-04-10 | 黄山永新股份有限公司 | Aseptic packaging bag for milk machine and production process thereof |
| WO2021084464A1 (en) * | 2019-10-30 | 2021-05-06 | DIEDLOFF, Manley | Recyclable polyethylene-based packaging material for use on horizontal form-fill-seal machines and a method of its manufacture |
| CN114573893A (en) * | 2020-12-01 | 2022-06-03 | 中国石油天然气股份有限公司 | Middle layer composite material of heavy packaging film and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102173160A (en) * | 2010-12-29 | 2011-09-07 | 东莞市正新包装制品有限公司 | Heavy-duty thermal shrinkage polyethylene film and preparation method thereof |
| CN102240299A (en) * | 2010-05-14 | 2011-11-16 | 北京润德康医药技术有限公司 | Improved intravenously dripped multi-vitamin injection |
| CN102350843A (en) * | 2011-09-13 | 2012-02-15 | 佛山新长盛塑料薄膜有限公司 | Formula of standing bag laminated film with high impact resistance and high stiffness |
-
2014
- 2014-02-17 CN CN201410053594.2A patent/CN103818083B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102240299A (en) * | 2010-05-14 | 2011-11-16 | 北京润德康医药技术有限公司 | Improved intravenously dripped multi-vitamin injection |
| CN102173160A (en) * | 2010-12-29 | 2011-09-07 | 东莞市正新包装制品有限公司 | Heavy-duty thermal shrinkage polyethylene film and preparation method thereof |
| CN102350843A (en) * | 2011-09-13 | 2012-02-15 | 佛山新长盛塑料薄膜有限公司 | Formula of standing bag laminated film with high impact resistance and high stiffness |
Non-Patent Citations (3)
| Title |
|---|
| 中国石油化工集团公司人事部编: "《聚乙烯装置操作工》", 30 April 2008, 中国石化出版社 * |
| 李亚琴主编: "《药物制剂工程》", 30 September 2009, 化学工业出版社 * |
| 李青年主编: "《薄膜制品涉及生产加工新工艺与应用新技术实务全书》", 30 April 2004, 银声音像出版社 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105713241A (en) * | 2016-04-15 | 2016-06-29 | 上海福助工业有限公司 | Biodegradable thermoplastic starch resin film and preparation method thereof |
| CN106626636A (en) * | 2016-12-01 | 2017-05-10 | 成泰昌包装制品(深圳)有限公司 | High-strength packaging film |
| CN106829170A (en) * | 2017-02-10 | 2017-06-13 | 嘉兴乾昆工业设计有限公司 | A kind of moistureproof rice package bag and its processing technology |
| CN106829167A (en) * | 2017-02-10 | 2017-06-13 | 嘉兴乾昆工业设计有限公司 | One kind separates composite lights face-connected film bag |
| CN109435403A (en) * | 2018-12-28 | 2019-03-08 | 大连大富塑料彩印有限公司 | A kind of puncture resistance composite membrane |
| WO2021084464A1 (en) * | 2019-10-30 | 2021-05-06 | DIEDLOFF, Manley | Recyclable polyethylene-based packaging material for use on horizontal form-fill-seal machines and a method of its manufacture |
| CN110979956A (en) * | 2019-12-11 | 2020-04-10 | 黄山永新股份有限公司 | Aseptic packaging bag for milk machine and production process thereof |
| CN114573893A (en) * | 2020-12-01 | 2022-06-03 | 中国石油天然气股份有限公司 | Middle layer composite material of heavy packaging film and preparation method thereof |
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