CN101209581A - Method of preparing downward-blowing water-cooling blow-molding polyethylene membrane - Google Patents
Method of preparing downward-blowing water-cooling blow-molding polyethylene membrane Download PDFInfo
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- CN101209581A CN101209581A CNA200610155899XA CN200610155899A CN101209581A CN 101209581 A CN101209581 A CN 101209581A CN A200610155899X A CNA200610155899X A CN A200610155899XA CN 200610155899 A CN200610155899 A CN 200610155899A CN 101209581 A CN101209581 A CN 101209581A
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- polyethylene
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Abstract
The invention relates to a manufacturing method of a downward blowing water-cooling blow polyethylene film. The invention is characterized in that downward blowing wind-cooling is first carried out to polyethylene bulb which is extruded out of a finish mold and water-cooling is carried out thereof so as to implement the sudden reduction of the temperature of a fused mass film. The temperature of the fused mass film is reduced rapidly to ensure that the viscosity of the fused mass is increased rapidly, the active capability of molecular chain is weakened, the crystallisation process is not perfect, the formed crystal is small, the film with low degree of crystallisation has wider melting temperature range, good transparency and flexible performance; meanwhile, after being cooled by water, the film adsorbs part of the low molecules which are separated out of the surface and reduces the peculiar smell of the film.
Description
Technical field
The present invention relates to a kind of manufacture method of blow-molding polyethylene membrane, the polyethylene film that particularly adopts lower blowing water cooling method to produce.
Background technology
In producing the polyethylene film process, except that given prescription, its process for cooling also can produce bigger influence to the quality and the performance of product.The process for cooling of known production polyethylene film has two kinds, a kind of is the curtain coating polyethylene film that adopts casting apparatus to produce, the PEF melt that the extruder die head is extruded flows directly on the chill roll with interior cold layer, this process film is not easy to form big crystal, therefore the transparency of film is better, the deflection of film is little, and pliability is better.Another kind is the up-draught cooling method, the polyethylene melt that flows out from the mouth mould relies on and is centered around mouthful vane of mould die lip and blows out poly-cold wind curtain to cool off as early as possible in that the film bubble is outer, this cooling means makes the molecule of high molecular polymer have more time to be discharged in the lattice, therefore form big crystal easily, influence the transparency of film, and deflection is big, pliability is relatively poor, and owing to can separate out low-molecular material in the film forming process, the film peculiar smell of production is also bigger.
Summary of the invention
The object of the present invention is to provide a kind of manufacture method of downward-blowing water-cooling blow-molding polyethylene membrane,, realize improving the transparency and the flexibility of film, improve the film peculiar smell by the cold method that combines with water-cooled of canyon.
Technical solution of the present invention is: a kind of manufacture method of downward-blowing water-cooling blow-molding polyethylene membrane, it is characterized in that the polyethylene film bubble of extruding from the mouth mould is carried out the canyon cooling earlier, and carry out water cooling then, realize the melt film temperature decrease.
The polyethylene film bubble contacts with cooling water rapidly after short-range canyon cooling.
The quenching that the present invention mainly realizes film by the mode that adopts the canyon cooling to combine with water cooling but, by water cooling rapidly film temperature is reduced rapidly, melt viscosity increases sharply, the strand mobility weakens, the crystallization process imperfection, the crystal that forms is less, and the film of low-crystallinity has the melt temperature scope of broad, transparency and softness preferably.Film has adsorbed the low-molecular material that part surface is separated out after water cooling simultaneously, has improved the peculiar smell of film.
Characteristics of the present invention are: adopt the cooling means of water-cooled, reduced the thin film crystallization degree, thereby reduced melt temperature, improve the transparency and the softness of film greatly, reduce the film peculiar smell.
The specific embodiment
Being used in the present embodiment film is carried out water-cooled equipment is cooling jacket, and it is arranged on the below of vane.The polyethylene melt that flows out from extruding dies is inflated to desired diameter by injecting air with the film bubble, and film bubble outer wall is after short-range air cooling, and cooling water rapid and from the cooling jacket ejection fully contacts, and its temperature is reduced rapidly, realizes quenching but.When film bubble is cooled to be lower than fusing point with collapser with periosteum collapse form flat film, drying, corona, rolling afterwards.
Claims (2)
1. the manufacture method of a downward-blowing water-cooling blow-molding polyethylene membrane is characterized in that the polyethylene film bubble of extruding from the mouth mould is carried out the canyon cooling earlier, carries out water cooling then, realizes the melt film temperature decrease.
2. the manufacture method of downward-blowing water-cooling blow-molding polyethylene membrane according to claim 1 is characterized in that the polyethylene film bubble after short-range canyon cooling, contacts with cooling water rapidly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200610155899XA CN101209581A (en) | 2006-12-30 | 2006-12-30 | Method of preparing downward-blowing water-cooling blow-molding polyethylene membrane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200610155899XA CN101209581A (en) | 2006-12-30 | 2006-12-30 | Method of preparing downward-blowing water-cooling blow-molding polyethylene membrane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101209581A true CN101209581A (en) | 2008-07-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200610155899XA Pending CN101209581A (en) | 2006-12-30 | 2006-12-30 | Method of preparing downward-blowing water-cooling blow-molding polyethylene membrane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101209581A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102029709B (en) * | 2009-10-05 | 2012-12-12 | 大连大富塑料彩印有限公司 | Method for manufacturing polymer film |
-
2006
- 2006-12-30 CN CNA200610155899XA patent/CN101209581A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102029709B (en) * | 2009-10-05 | 2012-12-12 | 大连大富塑料彩印有限公司 | Method for manufacturing polymer film |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080702 |