US4644623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a rotatable molding element for selectively aperturing thermoplastic film
Assignee: Tredegar Film Products LLC
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Filing: 1985-04-11
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Granted: 1987-02-24
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Expires: 2005-04-11
Abstract
Abstract An apparatus for the manufacture of selectively apertured thermoplastic sheet or film, comprising a rotatable molding element means for receiving the film and which means has a predetermined pattern therein wherein as the film is contacted with the rotatable molding element means and a fluid pressure differential is applied to the surface of the film, a desired pattern of perforated areas and non-perforated areas are imparted to the film with each of said areas being continuous across the web of the film and alternating in the machine direction.
Inventors
- 👤 Garland E. Raley
- 👤 Dean M. Spear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:14
CPC Classifications
B; B26; B26F; B26F1/00; B26F1/26; B29; B29C; B29C59/00; B29C59/02; B29C59/06; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1028; Y10T156/1033; Y10T29/00; Y10T29/49; Y10T29/49544; Y10T29/49547
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
144 words
A method of making a rotatable molding element means for selectively aperturing thermoplastic sheet or film comprising: a. providing a cylindrically shaped base pattern screen having a plurality of openings therein arranged in a predetermined pattern wherein as thermoplastic film is contacted with said screen and a fluid pressure differential is placed on the surface of the film, said pattern on said screen is imparted to the film; b. mounting a spunbonded-nonwoven breathable thermally resistant thin airflow restrictor sheet material over the outer surface of a portion of the base pattern screen for providing localized restriction of airflow through said screen; and c. mounting an overlay screen over said airflow restrictor sheet material and securing said overlay screen on said base pattern screen thereby providing a rotatable element means for perforating a thermoplastic film having a desired pattern of perforated areas and non-perforated areas.
Claim 2
Independent Claim
144 words
A method of making a rotatable molding element means for selectively aperturing thermoplastic sheet or film comprising: a. providing a cylindrically shaped base pattern screen having a plurality of openings therein arranged in a predetermined pattern wherein as thermoplastic film is contacted with said screen and a fluid pressure differential is placed on the surface of the film, said pattern on said screen is imparted to the film; b. mounting a spunbonded-nonwoven breathable thermally resistant thin airflow restrictor sheet material over the outer surface of a portion of the base pattern screen for providing localized restriction of airflow through said screen; and c. mounting an overlay screen over said airflow restrictor sheet material and securing said overlay screen on said base pattern screen thereby providing a rotatable element means for perforating a thermoplastic film having a desired pattern of perforated areas and non-perforated areas.
Claim 3
Dependent Claim
16 words
The method of claim 1, wherein said airflow restrictor sheet material is a spunbonded-nonwoven polyester cloth.
Claim 4
Dependent Claim
68 words
The method of claim 1, wherein said cylindrically shaped base pattern screen is made of metal or other suitable material of sufficiently high heat conductivity to effect a reduction in the relative temperature of those portions of plasticized material to come in contact with the solid surface of the screen as distinguished from those portions of the plasticized material which are directly over the openings in said screen.
Claim 5
Dependent Claim
18 words
The method of claim 1, wherein said cylindrically shaped base pattern screen is a woven wire mesh screen.
Claim 6
Dependent Claim
25 words
The method of claim 1, wherein said overlay screen has been formed to substantially the same size and shape as the airflow restrictor sheet material.
Claim 7
Dependent Claim
29 words
The method of claim 1, wherein said airflow restrictor sheet material comprises two layers of spunbonded-nonwoven breathable thermally resistant sheet materials each having a thickness of about 5 mils.
Claim 8
Independent Claim
145 words
A method of making a rotatable molding element means for selectively aperturing thermoplastic sheet or film comprising: a. providing a cylindrically shaped base pattern screen having a plurality of openings therein arranged in a predetermined pattern wherein as thermoplastic film is contacted with said screen and a fluid pressure differential is placed on the surface of the film, said pattern on said screen is imparted to the film: b. adhesively attaching a spunbonded-nonwoven breathable thermally resistant thin airflow restrictor sheet material over the outer surface of a portion of the base pattern screen for providing localized restriction of airflow through said screen; and, c. mounting an overlay screen over said airflow restrictor sheet material and securing said overlay screen on said base pattern screen thereby providing a rotatable element means for perforating a thermoplastic film having a desired pattern of perforated areas and non-perforated areas.
Claim 9
Independent Claim
145 words
A method of making a rotatable molding element means for selectively aperturing thermoplastic sheet or film comprising: a. providing a cylindrically shaped base pattern screen having a plurality of openings therein arranged in a predetermined pattern wherein as thermoplastic film is contacted with said screen and a fluid pressure differential is placed on the surface of the film, said pattern on said screen is imparted to the film: b. adhesively attaching a spunbonded-nonwoven breathable thermally resistant thin airflow restrictor sheet material over the outer surface of a portion of the base pattern screen for providing localized restriction of airflow through said screen; and, c. mounting an overlay screen over said airflow restrictor sheet material and securing said overlay screen on said base pattern screen thereby providing a rotatable element means for perforating a thermoplastic film having a desired pattern of perforated areas and non-perforated areas.
Claim 10
Independent Claim
162 words
A method of making a rotatable molding element means for selectively aperturing thermoplastic sheet or film comprising: a. providing a cylindrically shaped base pattern screen having a plurality of openings therein arranged in a predetermined pattern wherein as thermoplastic film is contacted with said screen and a fluid pressure differential is placed on the surface of the film, said pattern on said screen is imparted to the film, and said openings formed in said cylindrically shaped base pattern screens having been formed by etching techniques; and, b. mounting a spunbonded-nonwoven breathable thermally resistant thin airflow restrictor sheet material over the outer surface of a portion of the base pattern screen for providing localized restriction of airflow through said screen; and c. mounting an overlay screen over said airflow restrictor sheet material and securing said overlay screen on said base pattern screen thereby providing a rotatable element means for perforating a thermoplastic film having a desired pattern of perforated areas and nonperforated areas.
Claim 11
Independent Claim
162 words
A method of making a rotatable molding element means for selectively aperturing thermoplastic sheet or film comprising: a. providing a cylindrically shaped base pattern screen having a plurality of openings therein arranged in a predetermined pattern wherein as thermoplastic film is contacted with said screen and a fluid pressure differential is placed on the surface of the film, said pattern on said screen is imparted to the film, and said openings formed in said cylindrically shaped base pattern screens having been formed by etching techniques; and, b. mounting a spunbonded-nonwoven breathable thermally resistant thin airflow restrictor sheet material over the outer surface of a portion of the base pattern screen for providing localized restriction of airflow through said screen; and c. mounting an overlay screen over said airflow restrictor sheet material and securing said overlay screen on said base pattern screen thereby providing a rotatable element means for perforating a thermoplastic film having a desired pattern of perforated areas and nonperforated areas.
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) | 1990-02-23 | 1990-08-25 | 1991-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-23 | 1994-08-25 | 1995-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-23 | 1998-08-25 | 1999-02-24 | $7700.00 | Window Closed / Lapsed |