US3707102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film perforating apparatus
Assignee: Primerica Inc
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Filing: 1970-07-21
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Granted: 1972-12-26
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Expires: 1990-07-21
Abstract
Abstract The perforating apparatus disclosed includes a perforating roll which has a plurality of apertures in the shape of the perforations to be made in the film. Heated needles are positioned in each of the apertures and the surface surrounding the apertures is cooled below the melting point of the film. A pair of supplementary rolls position the film over the perforating roll so that the film is wrapped almost a full 360* as it is passed over the roll in the perforating process.
Inventors
- 👤 George Alfred Huppenthal
- 👤 Shlomo Peeri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:18
CPC Classifications
B; B26; B26F; B26F1/00; B26F1/26; Y; Y10; Y10T; Y10T83/00; Y10T83/283; Y10T83/293
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
96 words
Apparatus for perforating a plastic film comprising: a perforating roll supported for rotation, the outer surface of said roll having a plurality of apertures; a plurality of needles mounted to said roll and positioned in said apertures; means for heating said needles; means for cooling the surface of said roll around said apertures; means for feeding said film to said roll; means for removing said film from said roll; and means for positioning said film around the surface of said roll so that said heated needles form perforations in said film as said roll is rotated.
Claim 2
Dependent Claim
96 words
Apparatus for perforating a plastic film comprising: a perforating roll supported for rotation, the outer surface of said roll having a plurality of apertures; a plurality of needles mounted to said roll and positioned in said apertures; means for heating said needles; means for cooling the surface of said roll around said apertures; means for feeding said film to said roll; means for removing said film from said roll; and means for positioning said film around the surface of said roll so that said heated needles form perforations in said film as said roll is rotated.
Claim 3
Dependent Claim
45 words
Apparatus in accordance with claim 1 wherein said means for positioning said film includes first and second supplementary rollers positioned adjacent each other and adjacent said perforating roll so that said film makes contact with a majority of the surface area of said perforating roll.
Claim 4
Dependent Claim
26 words
Apparatus in accordance with claim 1 wherein each of said needles has a conically shaped nose projecting above the surface of said roll through said apertures.
Claim 5
Dependent Claim
15 words
Apparatus in accordance with claim 1 wherein said needles are positioned adjustably in said apertures.
Claim 6
Dependent Claim
23 words
Apparatus in accordance with claim 4 wherein said perforating roll is provided with means for varying the area of each of said apertures.
Claim 7
Dependent Claim
153 words
Apparatus for perforating a plastic film comprising: a perforating roll rotating about a fixed axis, the outer surfacE of said roll having a plurality of apertures of a predetermined shape; a plurality of needles mounted to said roll and positioned in said apertures, the cross-sectional size and shape of said needle at the surface of said roll closely matching the size and shape of said apertures; means for heating said needles; coolant passages in said roll and close to said surface, through which passages a coolant flows; recirculating means for continually supplying the coolant to said passages to chill the surface of said roll; means for feeding said film to said roll; means for removing said film from said roll; and means adjacent said roll for tensioning said film around said surface of said roll such that the majority of said surface area is contacted by said film as said roll is rotated.
Claim 8
Dependent Claim
153 words
Apparatus for perforating a plastic film comprising: a perforating roll rotating about a fixed axis, the outer surfacE of said roll having a plurality of apertures of a predetermined shape; a plurality of needles mounted to said roll and positioned in said apertures, the cross-sectional size and shape of said needle at the surface of said roll closely matching the size and shape of said apertures; means for heating said needles; coolant passages in said roll and close to said surface, through which passages a coolant flows; recirculating means for continually supplying the coolant to said passages to chill the surface of said roll; means for feeding said film to said roll; means for removing said film from said roll; and means adjacent said roll for tensioning said film around said surface of said roll such that the majority of said surface area is contacted by said film as said roll is rotated.
Claim 9
Dependent Claim
37 words
Apparatus in accordance with claim 5 wherein said means for positioning said film around said roll includes first and second supplementary rollers positioned adjacent each other, said film passing around said perforating roll and between said rollers.
Claim 10
Dependent Claim
39 words
Apparatus in accordance with claim 5 wherein said perforating roll has a heat conducting surface layer surrounding said passages and a heat insulating inner layer to insulate said surface layer from the heat of said needles inside said roll.
References Cited (Backward Citations)
US3243488A
Cited
US3355974A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-26 | 1976-06-26 | 1976-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-26 | 1980-06-26 | 1980-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-26 | 1984-06-26 | 1984-12-26 | $7700.00 | Window Closed / Lapsed |