Patent US3849227A successfully refreshed from Google Patents.
US3849227A
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Method for score sealing a foam plastic container
Assignee: STICHTING ONTWIKK VERPAK
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Filing: 1972-04-20
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Granted: 1974-11-19
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Expires: 1992-04-20
Abstract
Abstract A method for the application of a sealing weld to a container of foam plastic wherein an upright sealing weld is provided, which at the side facing the contents of the containers is provided with a score weld that is tearable and is almost completely protected by the parts of the sealing weld and the container that have remained ductile. The device for the application of the method comprises two heated jaws wherein at least one of the jaws is provided at the lower side with a ridge that protrudes above the inner surface of the jaw. This application also discloses a container provided with at least one sealing weld comprising a score weld according to this method.
Inventors
- 👤 T Frieling
- 👤 T Bruggencate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:33
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/02; B29C65/18; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/431; B29C66/4312; B29C66/43121; B29C66/43122; B29C66/70; B29C66/72; B29C66/727; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B65; B65B; B65B51/00; B65B51/10; B65B51/14; B65B51/144; B29C66/71; B29C66/723; B29C66/7232; B29C66/72327; B29C66/72328; B29C66/737; B29C66/7375; B29C66/73755; B29C66/73756; B29C66/7394; B29C66/73941; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/0608; B29K2023/0633; B29K2023/10; B29K2023/12; B29K2025/00; B29K2027/00; B29K2027/06; B29K2033/00; B29K2033/04; B29K2033/08; B29K2055/00; B29K2055/02; B29K2105/00; B29K2105/04; B29K2105/046; B29K2105/24; B29L; B29L2031/00; B29L2031/712; B29L2031/7162; B29L2031/7166; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1082
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
126 words
A METHOD FOR THE APPLICATION OF A SEALING WELD TO A CONTAINER OF FOAM PLASTIC SHEET WITH A SENSITY OF LESS THAN 250 KG/M3, COMPRISING: A. OVERLAPPING THE PARTS OF THE FOAM PLASTIC TO BE WELDED, B. EAL WELDING SAID OVERLAPPED PARTS TOGETHER BY MEANS OF PRESSURE THAT COMPRESSES THE WELDED PARTS TO BETWEEN ABOUT 10 PERCENT AND 20 PERCENT OF THEIR ORIGINAL THICKNESS AT A TEMPERATURE APPROXIMATELY 20*C ABOVE THE SOFTENING POINT OF THE PLASTIC FOR A TIME OF LESS THAN ABOUT 10 SECONDS WITHOUT THE FOAMY CHARACTER OF THE WELD BEING LOST, AND C. SIMULTANOUSLY WELDING A SCORE WELD ADJACENT AND ALONG SAID SEAL WELD AND THAT IS TEARABLE, AND IS FORMED BY COMPRESSING PARTS TO A THICKNESS LESS THAN 2 PERCENT OF THE
Claim 2
Independent Claim
126 words
A METHOD FOR THE APPLICATION OF A SEALING WELD TO A CONTAINER OF FOAM PLASTIC SHEET WITH A SENSITY OF LESS THAN 250 KG/M3, COMPRISING: A. OVERLAPPING THE PARTS OF THE FOAM PLASTIC TO BE WELDED, B. EAL WELDING SAID OVERLAPPED PARTS TOGETHER BY MEANS OF PRESSURE THAT COMPRESSES THE WELDED PARTS TO BETWEEN ABOUT 10 PERCENT AND 20 PERCENT OF THEIR ORIGINAL THICKNESS AT A TEMPERATURE APPROXIMATELY 20*C ABOVE THE SOFTENING POINT OF THE PLASTIC FOR A TIME OF LESS THAN ABOUT 10 SECONDS WITHOUT THE FOAMY CHARACTER OF THE WELD BEING LOST, AND C. SIMULTANOUSLY WELDING A SCORE WELD ADJACENT AND ALONG SAID SEAL WELD AND THAT IS TEARABLE, AND IS FORMED BY COMPRESSING PARTS TO A THICKNESS LESS THAN 2 PERCENT OF THE
Claim 3
Dependent Claim
31 words
A method according to claim 1, wherein said foam sheet is of polystyrene and said temperature is applied between about 120C and 145C for a time between 2 and 10 seconds.
Claim 4
Dependent Claim
30 words
A method according to claim 2, wherein said temperature is 127C plus or minus 3C and said time is approximately 4 seconds for a sheet thickness of approximately 2.5 mm.
Claim 5
Dependent Claim
37 words
A method according to claim 1, wherein, said foam sheet is of polyethylene and said temperature is applied at 127C plus or minus 1C for a time of 4 seconds for a sheet thickness of 2.5 mm.
Claim 6
Dependent Claim
43 words
A method according to claim 1, wherein said foam sheet is polyropylene having a density of approximately 70 kg/m3, and said temperature is applied at 183C plus or minus 1C, for a time of approximately 8 seconds for a sheet thickness of 2mm.
Claim 7
Dependent Claim
39 words
A method according to claim 1 wherein the width of the score becomes considerably less than the original thickness of the parts, and the score weld comes to lie approximately in the center of the welded bundle of parts.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |