US4499044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making a parison for blowmolding of a hollow article
Assignee: KHS GmbH
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Filing: 1981-12-30
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Granted: 1985-02-12
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Expires: 2001-12-30
Abstract
Abstract The heated end of a parison is brought into a finish mold form to shape a finish profile suitable for setting up a closure. The parison is axially stretched by a stretch pin to pull out the heated plastic material adjacent the profile to a thinner cross section. This allows to obtain a considerable saving of weight of the plastic material.
Inventors
- 👤 Norbert Hone
- 👤 Claus Horwege
- 👤 Otto Rosenkranz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:24
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/56; B29C49/071; B29C49/76; B29C57/00; B29C49/58; B29C2049/5806; B29C2049/581; B29C2949/00; B29C2949/07; B29C2949/072; B29C2949/0724; B29C2949/073; B29C2949/0731; B29C2949/0732; B29C2949/0733; B29C2949/076; B29C2949/0768; B29C2949/077; B29C2949/0772; B29C2949/0773; B29C2949/20; B29C2949/22; B29C2949/24; B29C2949/26; B29C2949/28
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
150 words
In a method of making a parison for blow molding a hollow body of thermoplastic material, in particular a bottle, wherein the parison includes an upper finish portion, a neck portion adjacent the finish portion and a closed bottom portion opposite the finish portion, said method comprising the steps of: heating the finish portion and the neck portion of the parison to welding and forming temperature, enclosing the heated portion of the parison in a finish mold, inserting a forming mandrel into the parison to urge plastic heated material from the finish portion into a part of the finish mold and secure the finish portion to said mold, further axially stretching the parison portion enclosed in said mold by a stretching pin to substantially reduce the wall thickness in the remaining finish portion and neck portion and shaping the final profile of the finish portion by applying a pressure medium.
Claim 2
Dependent Claim
150 words
In a method of making a parison for blow molding a hollow body of thermoplastic material, in particular a bottle, wherein the parison includes an upper finish portion, a neck portion adjacent the finish portion and a closed bottom portion opposite the finish portion, said method comprising the steps of: heating the finish portion and the neck portion of the parison to welding and forming temperature, enclosing the heated portion of the parison in a finish mold, inserting a forming mandrel into the parison to urge plastic heated material from the finish portion into a part of the finish mold and secure the finish portion to said mold, further axially stretching the parison portion enclosed in said mold by a stretching pin to substantially reduce the wall thickness in the remaining finish portion and neck portion and shaping the final profile of the finish portion by applying a pressure medium.
Claim 3
Dependent Claim
39 words
The method of claim 1, characterized in that for axially extending the heated portion of the parison, the closed cold bottom of the parison is engaged between the stretching pin and a holding sleeve gripping the parison from outside.
Claim 4
Dependent Claim
30 words
The method of claim 1 further comprising the step of forming the upper edge of the finish portion flush by bringing said heated edge into engagement with a forming member.
References Cited (Backward Citations)
US3969060A
Cited
US4108937A
Cited
DE2543640A1
Cited
GB1513067A
Cited
US4065535A
Cited
US4119394A
Cited
US4317793A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-12 | 1988-08-13 | 1989-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-12 | 1992-08-13 | 1993-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-12 | 1996-08-13 | 1997-02-12 | $7700.00 | Window Closed / Lapsed |