Patent US4210923A successfully refreshed from Google Patents.
US3752398A
Expired / Lapsed
US
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Method for simultaneous flush cleaning mixing chamber
Assignee: SVENSKA PLASTIC PROTECTION
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Filing: 1971-04-23
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Granted: 1973-08-14
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Expires: 1991-04-23
Abstract
Abstract In machines for spraying plastics, there is a risk that the spray head may be blocked by curing plastics mixture if the head with its mixing chamber is not carefully cleaned as soon as a spraying cycle is completed. The present invention eliminates this risk by a method for flush cleaning the spray head by means of a cleaning liquid which is injected in the head, said injection being controlled by means of valves also controlling the mixing and spraying of the plastics.
Inventors
- 👤 S Svensson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:55
CPC Classifications
B; B65; B65B; B65B15/00; B65B15/02; B01; B01F; B01F35/00; B01F35/10; B01F35/145; B01F35/1452; B05; B05B; B05B15/00; B05B15/50; B29; B29C; B29C48/00; B29C48/25; B29C48/27; B29C48/03; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0402; Y10T137/0419; Y10T137/0424; Y10T137/043
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
114 words
A method for simultaneously flush cleaning a mixing chamber in a spray head of machines for homogenizing and spraying reactive additive plastics having a short inductive period and in which the head is provided with rotary valVes controlling the mixing and spraying of the plastics and adjacent members for atomizing the plastics, comprising the steps of injecting from a pneumatically driven pressure increasing pump on a servo impulse from the rotary valves a cleaning liquid into the mixing chamber immediately upon the end of a spraying cycle to clean the mixing chamber and adjacent members from reactive plastics, and refilling the pump by a servo impulse at the beginning of the next spraying cycle.
Claim 2
Independent Claim
114 words
A method for simultaneously flush cleaning a mixing chamber in a spray head of machines for homogenizing and spraying reactive additive plastics having a short inductive period and in which the head is provided with rotary valVes controlling the mixing and spraying of the plastics and adjacent members for atomizing the plastics, comprising the steps of injecting from a pneumatically driven pressure increasing pump on a servo impulse from the rotary valves a cleaning liquid into the mixing chamber immediately upon the end of a spraying cycle to clean the mixing chamber and adjacent members from reactive plastics, and refilling the pump by a servo impulse at the beginning of the next spraying cycle.
Claim 3
Dependent Claim
41 words
The method for simultaneously flush cleaning a mixing chamber in a spray head as claimed in claim 1 in which a mixing member rotatable in the mixing chamber due to a delayed shutting impulse continues its rotation during the cleaning cycle.
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |