US3762256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric web shredding
Assignee: EIDP Inc
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Filing: 1972-04-17
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Granted: 1973-10-02
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Expires: 1992-04-17
Abstract
Abstract A method and apparatus for the shredding of a polymeric web wherein the web is subdivided in two sequential steps, the first constituting a planar cut removing a segment having a serrated edge configuration and the second constituting a multiple cut transverse the segment.
Inventors
- 👤 D Frantz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:11
CPC Classifications
B; B29; B29B; B29B17/00; B29B17/04; B02; B02C; B02C18/00; B02C18/06; B02C18/14; B02C18/148; B02C18/16; B02C18/18; B02C18/186; B23; B23D; B23D25/00; B26; B26D; B26D1/00; B26D1/01; B26D1/12; B26D1/25; B26D1/34; B26D1/38; B29B2017/0424; B29B2017/044; B29L; B29L2007/00; B29L2007/008; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/52; Y02W30/62; Y10; Y10S; Y10S83/00; Y10S83/906; Y10T; Y10T83/00; Y10T83/485; Y10T83/494; Y10T83/501; Y10T83/503; Y10T83/647; Y10T83/6472
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
207 words
Apparatus for shredding a polymeric web comprising, in combination, a power-driven rotary cutter provided on the periphery with at least one radially disposed sawtooth cutter blade aligned substantially co-parallel with the longitudinal axis of said cutter, first and second stationary sawtooth bed knives disposed in interdigitating relationship with respect to said saw-tooth cutter blade of said rotary cutter, said second stationary sawtooth bed knife beiNg spaced away from said first stationary sawtooth bed knife in the direction of rotation of said rotary cutter a sufficient distance to permit positioning of individual polymeric segments cut away from said web at said first stationary sawtooth bed knife under the force of gravity and displacement by said rotary cutter during said rotation to a location relative to said second stationary sawtooth bed knife effecting transverse cutting of said polymeric segments during the interdigitating sweep of said sawtooth cutter blade of said rotary cutter past the sawteeth of said second stationary sawtooth bed knife, guide means disposed between said first and said second stationary sawtooth bed knives positively guiding said polymeric segments to said position for said transverse cutting of said segments, and means removing cut pieces of said polymeric segments from the vicinity of said second stationary sawtooth bed knive.
Claim 2
Dependent Claim
207 words
Apparatus for shredding a polymeric web comprising, in combination, a power-driven rotary cutter provided on the periphery with at least one radially disposed sawtooth cutter blade aligned substantially co-parallel with the longitudinal axis of said cutter, first and second stationary sawtooth bed knives disposed in interdigitating relationship with respect to said saw-tooth cutter blade of said rotary cutter, said second stationary sawtooth bed knife beiNg spaced away from said first stationary sawtooth bed knife in the direction of rotation of said rotary cutter a sufficient distance to permit positioning of individual polymeric segments cut away from said web at said first stationary sawtooth bed knife under the force of gravity and displacement by said rotary cutter during said rotation to a location relative to said second stationary sawtooth bed knife effecting transverse cutting of said polymeric segments during the interdigitating sweep of said sawtooth cutter blade of said rotary cutter past the sawteeth of said second stationary sawtooth bed knife, guide means disposed between said first and said second stationary sawtooth bed knives positively guiding said polymeric segments to said position for said transverse cutting of said segments, and means removing cut pieces of said polymeric segments from the vicinity of said second stationary sawtooth bed knive.
Claim 3
Dependent Claim
100 words
Apparatus for shredding a polymeric web according to claim 1 wherein said first stationary sawtooth bed knife is disposed in a substantially horizontal plane below the longitudinal axis of said rotary cutter and said second stationary sawtooth bed knife is disposed at a generally lower level than said first stationary sawtooth bed knife and at an angle with respect to said first stationary sawtooth bed knife greater than about 90and at a spacing in said direction of rotation of said rotary cutter from said first stationary sawtooth bed knife greater than about 60* of the circumference of said rotary cutter.
Claim 4
Dependent Claim
86 words
Apparatus for shredding a polymeric web according to claim 2 wherein said guide means disposed between said first and said second stationary sawtooth bed knives comprise a plurality of arcuate members disposed approximately equidistant radially with respect to said rotary cutter, said arcuate members being provided along the inboard edges with camming surfaces polymeric said ploymeric segments approximately one half pitch laterally in the course of transit of each said polymeric segment from said first stationary sawtooth bed knife to said second stationary sawtooth bed knife.
Claim 5
Dependent Claim
50 words
Apparatus for shredding a polymeric web according to claim 1 wherein said power-driven rotary cutter is provided on the periphery with a plurality of radially disposed sawtooth cutter blades aligned substantially co-parallel with the longitudinal axis of said cutter and spaced apart substantially equiangularly with respect to said rotary cutter.
Claim 6
Dependent Claim
62 words
Apparatus for shredding a polymeric web according to claim 1 wherein said power-driven rotary cutter and said first and second stationary sawtooth bed knives are disposed within an enclosed housing and said means removing said cut pieces of said polymeric segments from the vicinity of said second stationary sawtooth bed knife is an air sweep directed generally away from said rotary cutter.
Claim 7
Dependent Claim
85 words
Apparatus for shredding a polymeric web according to claim 5 provided with a polymeric web feed-in slot in general prolongation with said first stationary sawtooth bed knife, retractable close-off means biased across said web feed-in slot at a clearance admitting said polymeric web into said housing but barring escape of said cut pieces of said polymeric segments out of said enclosed housing, and pressurized air supply means introducing air under pressure directed toward said rotary cutter from the bottom side of said web feed-in slot.
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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |