CN1058371A - The preparation method of high-strength hot shrinked plastic film - Google Patents
The preparation method of high-strength hot shrinked plastic film Download PDFInfo
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- CN1058371A CN1058371A CN 90104789 CN90104789A CN1058371A CN 1058371 A CN1058371 A CN 1058371A CN 90104789 CN90104789 CN 90104789 CN 90104789 A CN90104789 A CN 90104789A CN 1058371 A CN1058371 A CN 1058371A
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Abstract
The invention belongs to polyolefine material and be processed into the technical field of film.The employing high density polyethylene (HDPE) is a raw material, with plastic sheeting moulding blow extrusion method equipment and technology commonly used, prepares high-strength hot shrinked plastic film by selecting suitable plasticization temperature, mouthful die clearance, blow-up ratio and cold solidus height.A typical use of this film is the shrink wrapping that is suitable for the proportion large article, therefore can prepare broad-spectrum high-strength hot shrink-warp with the present invention.
Description
The invention belongs to polyolefine material and be processed into the technical field of film.
Some commodity adopts shrink wrapping, just be to use heat-shrinking plastics film packing after, in thermal medium, carry out the short time heating, plastic foil shunk and be attached to the commodity surface tightly, the purpose that reaches protection or decorate commodity.
Thermal contraction material film, the domestic market mainly is that polyvinyl chloride, vinylidene chloride and vinyl chloride copolymer are that raw material is made with low density polyethylene (LDPE) (resin density is 0.910～0.925) now.With these low-density resins is the heat-shrinking plastics film that raw material is made, certain heat-shrinkable is arranged, satisfied mechanical strength is also arranged, but in the time need making packaging material with the plastic foil of high strength, big hot contraction ratio, the heat-shrinking plastics film that the low-density resin material is made can not meet the demands.
In order to obtain high hot contraction ratio and high-intensity plastic sheeting, can be to the method for low-density resin material Applied Physics and chemical modification, promptly adopt electron accelerator that low density polyethylene films is carried out ionizing irradiation after, obtain the modified poly ethylene heat shrink films.This mode has obviously increased equipment and process procedure.Having had with high density polyethylene (HDPE) (resin density is 0.941～0.965) abroad is the heat-shrinking plastics film of feedstock production, and this film was imported China in recent years continually and used for China user.
The purpose of this invention is to provide a kind of is raw material with the high density polyethylene (HDPE), utilizes plastic sheeting moulding blow extrusion method equipment and technology commonly used, the method for producing high-strength hot shrinked plastic film.Can produce hot contraction ratio greater than 30% with method provided by the invention, high strength (in length and breadth to hot strength greater than 35Mpa, in length and breadth to elongation at break greater than 500%, in length and breadth to tearing strength greater than 1300N/CM) plastic sheeting.
Select for use resin density greater than 0.940, the high density polyethylene (HDPE) of melt index (MI) (MI) in 0.01～0.05 scope is raw material, on preparation low density plastics membrane equipment, adopt flat permanent formula or orthoscopic mode to control the extrusion plasticizing temperature, temperature range is in 180 ℃～210 ℃ scopes, and the film of blow-moulding process bubble cooling device is used greater than 1mm(to contain 1mm with spiral head and right angle vane) the mouth die clearance, 3.0～6 blow-up ratio, the cold solidus height of 150～400mm carries out blowing.The bubble tube shape of blowing is a garden shape.Film bubble center is provided with stable plug, and the principle of selecting for use of stablizing the diameter of mandrel size is: as long as the bubble pipe can be close to stable plug, should select for use minor diameter to be advisable as far as possible.Foam-stabilizing device is adopted in film bubble outside, is used for guaranteeing the perpendicularity of film pipe.The concrete numerical value of above-mentioned moulding process directly influences the physical and mechanical properties of goods, and the preparation of high-strength hot shrinked plastic packaging film should be selected for use by following actual conditions.
1, the film of preparation folding footpath width is 250mm～400mm, mould bore 50mm, and selecting blow-up ratio is 3～5, cold solidus height is suitable with 150mm～250mm.
2, the film of preparation folding footpath width is 380mm～550mm, and the mould bore is 60mm, and selecting blow-up ratio for use is 3.5～5.0, and cold solidus height is suitable with 180mm～300mm.
3, the film of preparation folding footpath width is 400mm～600mm, and the mould bore is 80mm, and selecting blow-up ratio for use is 3.3～6.0, and cold solidus height is suitable with 200mm～400mm.
The plastic sheeting of method for preparing according to the present invention, not only utilized the heat-resisting of high-density polyethylene material, cold tolerance is strong, waterproof, grease proofing, acid-proof, alkali prevention performance are good, air-tightness is good, but and folding endurance and opening, the printing performance excellent characteristic, and can prepare thickness greater than 0.12mm, shrinkage factor surpasses the film more than 30%, and can produce the heat shrink films of various amphiorentations and balanced amphiorentation according to needs, particularly prepared this film has than the high physical property of low density material.
With an object lesson implementation method of the present invention and the premium properties that has thereof are described below.
Making film folding footpath is 400mm, and thickness is the plastic sheeting of 0.12mm.
Select raw material for use: the trade mark is the 7000F(trade name) high density polyethylene (HDPE), its density is that 0.941 melt index (MI) (MI) is 0.05;
Production equipment: SJ45125D～BL800 type inflation film unit, its main technical characteristics:
A, main frame:
Diameter 45mm in a screw rod
B screw slenderness ratio 25: 1
0～150 rev/min of c screw speed
D production capacity 30kg/h
E main frame barrel heating power 74kw
F host driven power 13kw～15kw
G heating control section 6
B, subsidiary engine:
A traction and rolling speed 2～40m/min
B rolling core tube diameter 45mm
C rolling film Breadth Maximum 800mm
D traction power 0.8kw
E blower power 0.55kw
C, die head:
A adopts the spiral head, and die diameter is selected φ 60 for use.
Die clearance 1.00mm-1.40mm is adjustable for the b mouth, and is actual in 1.2mm mouth die clearance.
C vane right-angle type cooling vane, the vane internal diameter is 300mm, highly is 100mm.
The film forming technology controlling and process:
185 ℃ of 200 ℃ of die heads of the 200 ℃ of machine necks in a moulding process temperature 1-4 district
B blow-up ratio 4.2
The cold solidus height of c 400mm
D film bubble is stablized plug maximum diameter phi 80mm, the minimum diameter phi 40mm of place, long 300mm
The physical and mechanical properties testing result of goods (ginseng GB4456-84)
The horizontal 38Mpa of the vertical 35.3Mpa of a hot strength
B elongation at break vertical 548% horizontal 540%
The horizontal 1343N/cm of c angle tear strength 1450N/cm
The percent thermal shrinkage testing result of goods:
A is below 128 ℃ vertical 21% horizontal 26%
B more than 130 ℃ vertically, laterally all greater than 30%
Claims (3)
1, a kind of is the preparation method of raw material inflation film with the polyethylene, and feature is greater than 940Kg/m with density
3, melt index (MI) is that the polyethylene of 0.01-0.05 is a raw material, under molten condition, by extruder by an annular die gap greater than 1mm after, with the blow-up ratio of 3.0-6, the cold solidus height of 150mm-400mm forms film.
2, method according to claim 1, feature are that temperature range is 180 ℃～210 ℃ with flat permanent formula or orthoscopic control plasticization temperature.
3, method according to claim 1 and 2, feature are with the film bubble in spiral head and the right angle vane cooling blow-moulding process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90104789 CN1058371A (en) | 1990-07-21 | 1990-07-21 | The preparation method of high-strength hot shrinked plastic film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90104789 CN1058371A (en) | 1990-07-21 | 1990-07-21 | The preparation method of high-strength hot shrinked plastic film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1058371A true CN1058371A (en) | 1992-02-05 |
Family
ID=4878742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90104789 Pending CN1058371A (en) | 1990-07-21 | 1990-07-21 | The preparation method of high-strength hot shrinked plastic film |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1058371A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1331652C (en) * | 2001-07-17 | 2007-08-15 | 住友电工超效能高分子股份有限公司 | Heat contractable polyethylene tube |
| CN101970212B (en) * | 2008-02-27 | 2014-05-07 | 东洋纺织株式会社 | Heat-shrinkable white polyester film, process for producing heat-shrinkable white polyester film, label, and package |
-
1990
- 1990-07-21 CN CN 90104789 patent/CN1058371A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1331652C (en) * | 2001-07-17 | 2007-08-15 | 住友电工超效能高分子股份有限公司 | Heat contractable polyethylene tube |
| CN101970212B (en) * | 2008-02-27 | 2014-05-07 | 东洋纺织株式会社 | Heat-shrinkable white polyester film, process for producing heat-shrinkable white polyester film, label, and package |
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| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |