GB897728A - Process for the manufacture of foils of thermoplastic, at least partially crystalline polyolefines on a calender - Google Patents
Process for the manufacture of foils of thermoplastic, at least partially crystalline polyolefines on a calenderInfo
- Publication number
- GB897728A GB897728A GB2927258A GB2927258A GB897728A GB 897728 A GB897728 A GB 897728A GB 2927258 A GB2927258 A GB 2927258A GB 2927258 A GB2927258 A GB 2927258A GB 897728 A GB897728 A GB 897728A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rolls
- calender
- roll
- speed
- polyolefin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
- B29C43/24—Calendering
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Laminated Bodies (AREA)
Abstract
Films of thermoplastic, at least partially crystalline, polyolefins are made on a calender by a process comprising:- (a) heating the surfaces of all the rolls of the calender and keeping them at a temperature above the crystalline melting point of the polyolefin, (b) adjusting the calender rolls so that the speed of each rolls is at least 1,1 times the speed of the preceding roll and the speed ratio between the first and the last roll is at least 1:1,5 and preferably at least 1:2, and (c) adjusting the temperature of the surfaces of the rolls and the speed of the rolls to one another so that the kneading mass of the polyolefin accumulating in front of the slits between the rolls rotates within itself. The polyolefin may be a high-density polyethylene, p polypropylene, a copolymer of ethylene and propylene, a mixture of polyethylene and polypropylene or a mixture of low-density and high-density polyethylenes, and may be applied to the centre of the first calender roll in a width smaller than the available width of said roll. The film leaving the calender may be stretched in at least one direction, at a temperature above or below its crystalline melting point, as for example on rolls having a vulcanized hard rubber coating. After leaving the calender the film may be cooled, either by cold air or by cooled rolls. Specifications 799,392 and 799,823 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEF0023931 | 1957-09-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB897728A true GB897728A (en) | 1962-05-30 |
Family
ID=7091040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2927258A Expired GB897728A (en) | 1957-09-12 | 1958-09-12 | Process for the manufacture of foils of thermoplastic, at least partially crystalline polyolefines on a calender |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB897728A (en) |
-
1958
- 1958-09-12 GB GB2927258A patent/GB897728A/en not_active Expired
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