Patent US3674898A successfully refreshed from Google Patents.
US3674898A
Expired / Lapsed
US
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Method for bias cutting a tubular net
Assignee: Leucadia Inc
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Filing: 1971-02-24
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Granted: 1972-07-04
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Expires: 1991-02-24
Abstract
Abstract This invention provides a method for continuously severing a rotating and axially moving tubular net, having an axially oriented pattern, along a bias line thereof to transform the tubular net into a continuous flat web having a length oriented pattern different from the axially oriented pattern of the tubular net.
Inventors
- 👤 Ronald L Larsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:38
CPC Classifications
B; B26; B26D; B26D3/00; B26D3/16; B26D3/162; B29; B29C; B29C48/00; B29C48/03; B29C48/05; B29C48/09; B29C48/13; B29C48/25; B29C48/30; B29C48/32; B29C48/33; B29C48/345; B29C48/10; B29L; B29L2028/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
209 words
A method for extruding a tubular net of polymer made of at least two intersecting fibers and for cutting the extruded tubular net to change the axial pattern of the net in apparatus of the type that includes a pair of associated die members for extruding the fibers in the form of a tubular net and means for drawing the tubular net over a forming mandrel which comprises the steps of: a. extruding a tubular net made of at least two intersecting fibers by means of said die members, b. rotating the said two die members relative to each other to rotate the extruded tubular net, c. passing the tubular net in longitudinal direction over the said forming mandrel, d. causing the forming mandrel to rotate independently of said dies and net to rotate the tubular net thereon at a speed substantially equal to the speed of rotation imparted to the extruded tube by said die members to avoid excessive twisting and strain on the extruded net fibers in the area between said mandrel and extrusion die members, e. cutting the rotating tube along at least one selected path to form a flat web of net having a length pattern different from the axial pattern of the tubular net.
Claim 2
Independent Claim
209 words
A method for extruding a tubular net of polymer made of at least two intersecting fibers and for cutting the extruded tubular net to change the axial pattern of the net in apparatus of the type that includes a pair of associated die members for extruding the fibers in the form of a tubular net and means for drawing the tubular net over a forming mandrel which comprises the steps of: a. extruding a tubular net made of at least two intersecting fibers by means of said die members, b. rotating the said two die members relative to each other to rotate the extruded tubular net, c. passing the tubular net in longitudinal direction over the said forming mandrel, d. causing the forming mandrel to rotate independently of said dies and net to rotate the tubular net thereon at a speed substantially equal to the speed of rotation imparted to the extruded tube by said die members to avoid excessive twisting and strain on the extruded net fibers in the area between said mandrel and extrusion die members, e. cutting the rotating tube along at least one selected path to form a flat web of net having a length pattern different from the axial pattern of the tubular net.
Claim 3
Dependent Claim
63 words
The method specified in claim 1 which includes the steps of rotating each of said die members in a different direction and at a different rate of speed to impart rotation to said tubular net at a speed of about one half the difference in speed between the two die members and in the direction of rotation of the faster moving die member.
Claim 4
Dependent Claim
33 words
The method specified in claim 1 which includes the step of rotating only one of said die members to cause the tubular net to rotate as it is extruded from the die members.
Claim 5
Dependent Claim
28 words
The method specified in claim 1 which includes the step of continuously extruding one of said fibers and intermittently extruding the second fiber to form the tubular net.
Claim 6
Dependent Claim
29 words
The method specified in claim 1 which includes the step of cutting the rotating tube of net at a location which is stationary with respect to the extrusion apparatus.
Claim 7
Dependent Claim
31 words
The method specified in claim 5 which includes the step of winding the flat web of net on a roll located in a stationary position with respect to the extrusion apparatus.
Claim 8
Independent Claim
269 words
A method for extruding a tubular net of polymer made of at least two intersecting fibers and for cutting the extruded tubular net to change the axial pattern of the net in apparatus of the type that includes a die having an inner and an outer member each of which extrudes one of said fibers in the tubular net and means for drawing the tubular net over a forming mandrel which comprises the steps of: a. extruding a tubular net made of at least two intersecting fibers at least one of which is extruded by each die member, b. rotating the outer die member in one direction and rotating the iNner die member in a different direction and at a speed less than that of the outer die member to cause the tubular net to rotate in the direction of the outer die member and at a speed of about one-half the difference in the speed of the two die members, c. passing the tubular net in longitudinal direction over the said forming mandrel, d. causing the forming mandrel to rotate independently of said dies and net to rotate the tubular net thereon at a speed substantially equal to the speed of rotation imparted to the extruded tube by the die members to avoid excessive twisting and strain on the fibers of the net in the area between said mandrel and die members, e. cutting the tube along a path parallel to one of the fibers in the net to form a flat web of net having a length pattern different from the axial pattern of the tubular net.
Claim 9
Independent Claim
269 words
A method for extruding a tubular net of polymer made of at least two intersecting fibers and for cutting the extruded tubular net to change the axial pattern of the net in apparatus of the type that includes a die having an inner and an outer member each of which extrudes one of said fibers in the tubular net and means for drawing the tubular net over a forming mandrel which comprises the steps of: a. extruding a tubular net made of at least two intersecting fibers at least one of which is extruded by each die member, b. rotating the outer die member in one direction and rotating the iNner die member in a different direction and at a speed less than that of the outer die member to cause the tubular net to rotate in the direction of the outer die member and at a speed of about one-half the difference in the speed of the two die members, c. passing the tubular net in longitudinal direction over the said forming mandrel, d. causing the forming mandrel to rotate independently of said dies and net to rotate the tubular net thereon at a speed substantially equal to the speed of rotation imparted to the extruded tube by the die members to avoid excessive twisting and strain on the fibers of the net in the area between said mandrel and die members, e. cutting the tube along a path parallel to one of the fibers in the net to form a flat web of net having a length pattern different from the axial pattern of the tubular net.
Claim 10
Dependent Claim
19 words
The method specified in claim 7 which includes the step of cutting the tube along a substantially helical path.
Claim 11
Dependent Claim
18 words
The method specified in claim 7 which includes the step of preventing rotation of the inner die member.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |