US3865913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multistation process for manufacturing hollow bodies
Assignee: Lever Brothers Co
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Filing: 1973-12-12
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Granted: 1975-02-11
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Expires: 1993-12-12
Abstract
Abstract In a multi-station process for injection moulding preforms on a mandrel at one station, the mandrel carrying the preforms to a blow moulding station where they are blow moulded to the final shape, a plurality of mandrels are provided so that a mandrel is positioned at each station during each working cycle. The beginning and end of each working cycle is sensed and the actual elapsed time compared with a predetermined constant time, the next working cycle being begun at the end of either the elapsed time or the constant time whichever is the longer.
Inventors
- 👤 Otto Lachner
- 👤 Ludwig Beyerlein
- 👤 Klaus Spelthahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:34
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/02; B29C49/06; B29C49/061; B29C49/062; B29C49/063; B29C49/42; B29C49/78; B29C2049/023; Y; Y10; Y10S; Y10S425/00; Y10S425/20; Y10S425/203
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
120 words
A multi-station process of forming hollow articles of thermoplastic material comprising the steps of forming a preform by injecting a quantity of plasticised material through an injection nozzle into an injection mould and blow moulding the preform to the desired hollow shape in a blow mould, each of the steps being carried out during one working cycle, establishing an optimum pre-determined constant working cycle time, sensing the beginning of a working cycle, sensing the end of a working cycle as determined by the ejection of a blow moulded article from the blow mould, comparing the elapsed time for a working cycle with the pre-determined constant cycle time, and beginning a subsequent working cycle at the end of the longest time.
Claim 2
Dependent Claim
120 words
A multi-station process of forming hollow articles of thermoplastic material comprising the steps of forming a preform by injecting a quantity of plasticised material through an injection nozzle into an injection mould and blow moulding the preform to the desired hollow shape in a blow mould, each of the steps being carried out during one working cycle, establishing an optimum pre-determined constant working cycle time, sensing the beginning of a working cycle, sensing the end of a working cycle as determined by the ejection of a blow moulded article from the blow mould, comparing the elapsed time for a working cycle with the pre-determined constant cycle time, and beginning a subsequent working cycle at the end of the longest time.
Claim 3
Dependent Claim
26 words
A process according to claim 1 comprising sensing when the pre-dEtermined cycle time is exceeded by the elapsed time and applying heat to the injection nozzle.
Claim 4
Dependent Claim
34 words
A process according to claim 2 in which the preform is cooled by cooling the injection mould, the rate of cooling being reduced when the pre-determined cycle time is exceeded by the elapsed time.
Claim 5
Dependent Claim
40 words
A process according to claim 3 in which the heat applied to the injection nozzle and the reduction in the rate of cooling of the injection mould is proportional to the difference between the elapsed time and the pre-determined time.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |