Patent US3835212A successfully refreshed from Google Patents.
US3835212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing resinous sheet-like products
Assignee: Congoleum Corp
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Filing: 1971-10-29
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Granted: 1974-09-10
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Expires: 1991-10-29
Abstract
Abstract A method for continuously molding a resinous sheet-like product which comprises feeding a mono-layer of plastic chips onto a preheated endless, polished, smooth surface belt. The chips are deposited on the belt from a vibrator feeder in substantially abutting contact and are laterally compacted. The chips and belt are further heated to cause the chips to adhere to the belt and the belt and chips are passed through the nip of a pair of compression rolls so as to consolidate the chips into a sheet. The sheet is further heated, calendared and burnished, subsequently stripped from the belt and cut into tiles.
Inventors
- 👤 A Piacente
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:56
CPC Classifications
B; B29; B29C; B29C41/00; B29C41/24; B29C41/28; B29C43/00; B29C43/22; B29C2793/00; B29C2793/009; B29L; B29L2007/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
252 words
A method for continuously molding a resinous sheet-like product having a standstill appearance which does not have a flow or grain appearance comprising: a. providing an endless polished smooth surface heat resistant belt, b. preheating said belt, c. depositing a metered quantity of thermoplastic resinous chips on said belt from a vibrator feeder in substantially abutting contact and in a substantially mono-chip layer, d. compacting said chips laterally inwardly on said belt and adhering said chips to said belt by, e. heating said chips with a heater positioned above said chips on said belt, f. heating said belt with a heater positioned below said belt, g. said heating steps comprise heating said chips and said belt to a temperature of less than 330* F, h. compressing said heated chips against said heated belt by passing said heated chips and said heated belt through a pair of rolls forming a nip for said heated chips and said heated belt so as to consolidate said chips into a sheet adhering to said belt, i. heating said sheet and said belt, j. passing said sheet while adhered to said belt through a calender, k. burnishing said sheet by passing said sheet while adhered to said belt through a burnishing nip having a stationary surface contacting said sheet, l. applying a fluid cooling spray to said sheet and thereby cooling said sheet to less than 120* F, and m. stripping said sheet from said belt after cooling, thereby preventing sticking of said sheet to said belt.
Claim 2
Independent Claim
252 words
A method for continuously molding a resinous sheet-like product having a standstill appearance which does not have a flow or grain appearance comprising: a. providing an endless polished smooth surface heat resistant belt, b. preheating said belt, c. depositing a metered quantity of thermoplastic resinous chips on said belt from a vibrator feeder in substantially abutting contact and in a substantially mono-chip layer, d. compacting said chips laterally inwardly on said belt and adhering said chips to said belt by, e. heating said chips with a heater positioned above said chips on said belt, f. heating said belt with a heater positioned below said belt, g. said heating steps comprise heating said chips and said belt to a temperature of less than 330* F, h. compressing said heated chips against said heated belt by passing said heated chips and said heated belt through a pair of rolls forming a nip for said heated chips and said heated belt so as to consolidate said chips into a sheet adhering to said belt, i. heating said sheet and said belt, j. passing said sheet while adhered to said belt through a calender, k. burnishing said sheet by passing said sheet while adhered to said belt through a burnishing nip having a stationary surface contacting said sheet, l. applying a fluid cooling spray to said sheet and thereby cooling said sheet to less than 120* F, and m. stripping said sheet from said belt after cooling, thereby preventing sticking of said sheet to said belt.
Claim 3
Dependent Claim
14 words
A method as in claim 1 and including: cutting said sheet form into tiles.
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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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |