US3849174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calendering of laminated polymeric materials
Assignee: Union Carbide Corp
•
Filing: 1972-02-25
•
Granted: 1974-11-19
•
Expires: 1992-02-25
Abstract
Abstract Process and apparatus for the calendering of laminated plastic materials comprising providing a calender having a pair of counter-rotating rolls and a volumetric obstruction across the width and between said calender rolls, the most downstream projection of said obstruction being positioned so as to at least penetrate the bank of material otherwise formed between said calender rolls upstream of the nip by the selection of calendering conditions, and feeding streams of flowable plastic material to said nip opening on each side of said volumetric obstruction while concurrently feeding laminating webs between said streams of polymeric material, preferably through said obstruction. Optionally, additional solid laminating webs may be fed between the roll surfaces and each stream of flowable plastic material for the purpose of making multilayer laminates. Also, an expandable flowable plastic stream may be provided through the obstruction for the purpose of making foam core laminates.
Inventors
- 👤 F Ancker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:10
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/40; B29C70/50; B29C70/52; B29C70/525; B05; B05D; B05D1/00; B05D1/26; B05D1/265; B29C43/00; B29C43/22; B29C43/24; B29C44/00; B29C44/20; B29C44/30; B29C44/34; B29C44/36; B29C44/46; B29C44/48; B29C44/485; B29C48/00; B29C48/001; B29C48/0013; B29C48/0014; B29C48/03; B29C48/07; B29C48/08; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/35; B29C70/504; B29C43/32; B29C43/44; B29C43/46; B29L; B29L2009/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
118 words
IN THE CALENDERING OF LAMINATED PLASTIC MATERIALS, WHEREIN STREAMS OF FLOWABLE PLASTIC MATERIAL AND LAMINATING WEBS ARE FED THRU THE NIP OPENING OF A PAIR OF COUNTER-ROTATING CALENDER ROLLS, THE IMPROVEMENT WHICH COMPRISES CALENDERING WHILE MAINTAINING A VOLUMETRIC OBSTRUCTION ACROSS THE WIDTH AND BETWEEN THE PAIR OF CALENDER ROLLS, WITH THE MOST DOWNSTREAM PROJECTION OF SAID OBSTRUCTION BEING POSITIONED SO AS TO AT LEAST PENETRATE THE BANK OF MATERIAL OTHERWISE FORMED BETWEEN THE PAIR OF CALENDER ROLLS UPSTREAM OF THE NIP BY THE SELECTION OF CALENDERING CONDITIONS, AND FEEDING STREAMS OF PLASTIC MATERIAL TO SAID NIP OPENING ON EACH SIDE OF SAID VOLUMETRIC OBSTRUCTION WHILE CONCURRENTLY FEEDING AT LEAST ONE LAMINATING WEB BETWEEN SAID STREAMS OF POLYMETRIC MATERIAL.
Claim 2
Dependent Claim
118 words
IN THE CALENDERING OF LAMINATED PLASTIC MATERIALS, WHEREIN STREAMS OF FLOWABLE PLASTIC MATERIAL AND LAMINATING WEBS ARE FED THRU THE NIP OPENING OF A PAIR OF COUNTER-ROTATING CALENDER ROLLS, THE IMPROVEMENT WHICH COMPRISES CALENDERING WHILE MAINTAINING A VOLUMETRIC OBSTRUCTION ACROSS THE WIDTH AND BETWEEN THE PAIR OF CALENDER ROLLS, WITH THE MOST DOWNSTREAM PROJECTION OF SAID OBSTRUCTION BEING POSITIONED SO AS TO AT LEAST PENETRATE THE BANK OF MATERIAL OTHERWISE FORMED BETWEEN THE PAIR OF CALENDER ROLLS UPSTREAM OF THE NIP BY THE SELECTION OF CALENDERING CONDITIONS, AND FEEDING STREAMS OF PLASTIC MATERIAL TO SAID NIP OPENING ON EACH SIDE OF SAID VOLUMETRIC OBSTRUCTION WHILE CONCURRENTLY FEEDING AT LEAST ONE LAMINATING WEB BETWEEN SAID STREAMS OF POLYMETRIC MATERIAL.
Claim 3
Dependent Claim
27 words
The process in accordance with claim 1, in which said laminating web is a stream of reactant material capable of foaming to produce a foamed plastic core.
Claim 4
Dependent Claim
23 words
The process in accordance with claim 1, wherein said laminating web is fed to the nip of the calender through said volumetric obstruction.
Claim 5
Dependent Claim
25 words
The process in accordance with claim 1, wherein said volumetric obstruction is symmetrically shaped and positioned across the width of said pair of calender rolls.
Claim 6
Dependent Claim
123 words
The continuous process for the direct extrusion-calendering of laminated polymeric materials comprising forming by extrusion two separate continuous streams of molten flowable polymeric material, providing a calender having a pair of counter-rotating rolls and a volumetric obstruction across the width and between the pair of calender rolls with the most dowNstream projection of said obstruction being positioned so as to at least penetrate the bank of material otherwise formed between the pair of calender rolls upstream of the nip by the selection of calendering conditions, and feeding said two separate sheet streams of polymeric material to said calender rolls on opposite sides of said volumetric obstruction while feeding a laminating web through said obstruction to said nip between said streams of polymeric material.
Claim 7
Dependent Claim
123 words
The continuous process for the direct extrusion-calendering of laminated polymeric materials comprising forming by extrusion two separate continuous streams of molten flowable polymeric material, providing a calender having a pair of counter-rotating rolls and a volumetric obstruction across the width and between the pair of calender rolls with the most dowNstream projection of said obstruction being positioned so as to at least penetrate the bank of material otherwise formed between the pair of calender rolls upstream of the nip by the selection of calendering conditions, and feeding said two separate sheet streams of polymeric material to said calender rolls on opposite sides of said volumetric obstruction while feeding a laminating web through said obstruction to said nip between said streams of polymeric material.
Claim 8
Dependent Claim
25 words
The process in accordance with claim 5 wherein said volumetric obstruction is symmetrically shaped and positioned across the width of said pair of calender rolls.
References Cited (Backward Citations)
US894790A
Cited
US3560288A
Cited
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 |