PT74032A - Method and device for producing a tubular object - Google Patents
Method and device for producing a tubular objectInfo
- Publication number
- PT74032A PT74032A PT7403281A PT7403281A PT74032A PT 74032 A PT74032 A PT 74032A PT 7403281 A PT7403281 A PT 7403281A PT 7403281 A PT7403281 A PT 7403281A PT 74032 A PT74032 A PT 74032A
- Authority
- PT
- Portugal
- Prior art keywords
- profile
- radially
- esp
- clamps
- degree
- Prior art date
Links
Abstract
Tubular profile of a crystallisable thermoplastic is converted into an oriented tubular parison by heating the profile sufficiently to obtain ductility, compressing part of the profile radially and then drawing more of the profile through one or more radially restricted orifices to reduce the profile wall thickness and induce a degree of orientation which would match that obtained by monoaxial extension of a flat plaque of the same material at the same temperature to the same degree of thickness reduction. Equipment for such a process is described having twin radially contracting clamps which can then be separated coaxillay relative to the profile, the clamps being mounted on crossheads driven by contrarotating lead screws. Esp. suitable for preparing parisons of polyethylene terephthalate for producing blow-moulded containers, esp. where excessive initial extension is reqd. to permit partial contraction of the parison during dilation to obtain a balance of biaxial orientation when making small containers (less than 0.5L).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PT7403281A PT74032B (en) | 1981-11-24 | 1981-11-24 | Method and device for producing a tubular object |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PT7403281A PT74032B (en) | 1981-11-24 | 1981-11-24 | Method and device for producing a tubular object |
Publications (2)
Publication Number | Publication Date |
---|---|
PT74032A true PT74032A (en) | 1981-12-01 |
PT74032B PT74032B (en) | 1983-04-29 |
Family
ID=20083027
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PT7403281A PT74032B (en) | 1981-11-24 | 1981-11-24 | Method and device for producing a tubular object |
Country Status (1)
Country | Link |
---|---|
PT (1) | PT74032B (en) |
-
1981
- 1981-11-24 PT PT7403281A patent/PT74032B/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
PT74032B (en) | 1983-04-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MM3A | Annulment or lapse |
Free format text: LAPSE DUE TO NON-PAYMENT OF FEES Effective date: 20001031 |