GB833092A - Manufacture of polythene films - Google Patents
Manufacture of polythene filmsInfo
- Publication number
- GB833092A GB833092A GB31137/57A GB3113757A GB833092A GB 833092 A GB833092 A GB 833092A GB 31137/57 A GB31137/57 A GB 31137/57A GB 3113757 A GB3113757 A GB 3113757A GB 833092 A GB833092 A GB 833092A
- Authority
- GB
- United Kingdom
- Prior art keywords
- film
- patterned
- extrusion
- tubing
- held
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
Polythene of the type which, on extrusion through a melt-indexer according to A.S.T.M. D1238-57T, but under greatly increased loads, gives a monofil of substantially uniform diameter with a matt surface, is extruded through a slit or tube-forming die, and at least one side of the film or tubing at the point of extrusion is held at a temperature below that required to <PICT:0833092/IV (a)/1> produce clear film. In this way a patterned film, as illustrated, is obtained. The type of polythene required occurs particularly but not exclusively, among "high density" polythenes. Unsuitable polythenes, when tested as above, give a bumpy, twisted monofil of varying diameter. One side of the film or tubing may be held at a temperature between 20 DEG and 80 DEG C. below the minimum temperature at which clear film is obtained. With tubular film the inner surface is preferably maintained at the lower temperature, so as to obtain a patterned inner surface. Film with both surfaces patterned may be obtained if both the lips of the extrusion orifice are held at suitably low temperatures. The film or tubing may be stretched, at least in the extrusion direction, while still in a heatsoftened state, preferably to a ratio of 4 : 1 to 10 : 1. Transverse stretching, if employed, is preferably to a lower draw ratio than in the extrusion direction. The patterned surface obtained is also free from "blocking" (i.e. sticking to an adjacent smooth surface), so that tubular film with a patterned inner surface made in this way is readily opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB31137/57A GB833092A (en) | 1957-10-04 | 1957-10-04 | Manufacture of polythene films |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB31137/57A GB833092A (en) | 1957-10-04 | 1957-10-04 | Manufacture of polythene films |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB833092A true GB833092A (en) | 1960-04-21 |
Family
ID=10318565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB31137/57A Expired GB833092A (en) | 1957-10-04 | 1957-10-04 | Manufacture of polythene films |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB833092A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3255287A (en) * | 1960-07-01 | 1966-06-07 | Phillips Petroleum Co | Method of forming synthetic knopped filaments |
-
1957
- 1957-10-04 GB GB31137/57A patent/GB833092A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3255287A (en) * | 1960-07-01 | 1966-06-07 | Phillips Petroleum Co | Method of forming synthetic knopped filaments |
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