US3795471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for shaping hollow extrudates of a plastic material
Assignee: AMUNT SpA
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Filing: 1972-03-03
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Granted: 1974-03-05
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Expires: 1992-03-03
Abstract
Abstract An apparatus for impressing fancy patterns on the outer surface of extrudates of a plastic material, particularly a thermoplastic material. A continuous band or web is inserted between a mould wall and the extrudate outer surface and is fed forward concurrently with the extrudate, negative pressure being employed to imprint on the extrudate the desired patterns which are reproduced on the continuously advancing web or band. Preferably, the band or web is either porous or foraminous.
Inventors
- 👤 G Milani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:20
CPC Classifications
B; B29; B29C; B29C59/00; B29C59/02; B29C59/04; B29C59/043; B29C43/00; B29C43/22; B29C43/222; B29C43/224; B29C2791/00; B29C2791/004; B29C2791/006; B29C33/00; B29C33/38; B29C33/40; B29C33/405; B29C48/00; B29C48/001; B29C48/0017; B29C48/03; B29C48/09; B29K; B29K2995/00; B29K2995/0037; B29K2995/0072
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
134 words
Apparatus for the continuous formation of hollow extrudates of thermoplastic material having a patterned surface, said apparatus comprising, a shaping mold including opposed hollow members having confronting walls between which the hollow extrudate is adapted to pass while still hot, said confronting walls of the respective hollow members being perforated, means for producing suction pressure within said hollow members, means at least one shaping band extending through said mold between one of said confronting walls and said extrudate, said shaping band having a surface facing the extrudate to form a desired surface pattern thereon, said band being constructed to permit application therethrough of suction pressure to said extrudate whereby the extrudate is urged into contact with the band, and means for advancing the band and the extrudate through the mold at the same speed.
Claim 2
Dependent Claim
134 words
Apparatus for the continuous formation of hollow extrudates of thermoplastic material having a patterned surface, said apparatus comprising, a shaping mold including opposed hollow members having confronting walls between which the hollow extrudate is adapted to pass while still hot, said confronting walls of the respective hollow members being perforated, means for producing suction pressure within said hollow members, means at least one shaping band extending through said mold between one of said confronting walls and said extrudate, said shaping band having a surface facing the extrudate to form a desired surface pattern thereon, said band being constructed to permit application therethrough of suction pressure to said extrudate whereby the extrudate is urged into contact with the band, and means for advancing the band and the extrudate through the mold at the same speed.
Claim 3
Dependent Claim
33 words
Apparatus as claimed in claim 1 wherein said means for advancing the band and extrudate comprises means for driving the band which causes said band to advance and the extrudate to advance therewith.
Claim 4
Dependent Claim
40 words
Apparatus as claimed in claim 1 wherein said band is in the form of a closed loop, two rollers being provided on which the band travels such that one run of said band passes between the walls of the mold.
Claim 5
Dependent Claim
16 words
Apparatus as claimed in claim 1 wherein said band is constituted of an air pervious material.
Claim 6
Dependent Claim
15 words
Apparatus as claimed in claim 4 wherein said air pervious material is paper or felt.
Claim 7
Dependent Claim
11 words
Apparatus as claimed in claim 1 wherein said band is perforate.
Claim 8
Dependent Claim
25 words
Apparatus as claimed in claim 1 wherein two of said bands are provided, one between a respective wall and an opposite surface of the extrudate.
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) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |