US3620897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conveyor belts and process for their manufacture
Assignee: Kurashiki Rayon Co Ltd
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Filing: 1969-07-02
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Granted: 1971-11-16
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Expires: 1989-07-02
Abstract
Abstract A conveyor belt consisting of a core body and rubber covers interposing said core, the core body being formed of a nonwoven sheet of staple fiber webs, the fibers constituting the nonwoven sheet being mutually entangled by needling and at least approximately 80 percent thereof being oriented in longitudinal direction of the belt by drawing of the nonwoven sheet in longitudinal direction, and the nonwoven sheet being sufficiently impregnated with an adhesive. Such conveyor belt is prepared by a process which comprises needling a web of 200-1,000 g./m.2 formed of crimped and 40-120 mm. long staple fibers at a needling density of 50-250 times/cm.2; drawing the needled web in its longitudinal direction by at least 50 percent; impregnating the nonwoven sheet with an adhesive to produce a core body; and pressing rubber covers onto the top and bottom surfaces of such core body. The impregnation of the needled web with the adhesive may be conducted prior to drawing.
Inventors
- 👤 Katsukiyo Tanimoto
- 👤 Tamio Urakami
- 👤 Sotaro Itadani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:31
CPC Classifications
B; B29; B29D; B29D29/00; B29D29/06; B65; B65G; B65G15/00; B65G15/30; B65G15/32; B65G15/34; B65G2201/00; B65G2201/06; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T428/2905; Y10T442/00; Y10T442/60; Y10T442/608; Y10T442/627; Y10T442/635; Y10T442/636; Y10T442/674; Y10T442/679; Y10T442/682
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
66 words
The conveyor belt of claim 1, wherein said nonwoven sheet weighs 300 -1,500 g./m.2 and contains no less than 80 percent by weight thereof of an adhesive agent, at least 85 percent of said staple fibers constituting said nonwoven sheet being longitudinally oriented, the needling density of the webs being 70 -200 times/cm.2 , and the length of the staple fibers ranging from 45 -90 mm.
Claim 2
Dependent Claim
29 words
The conveyor belt of claim 1, wherein the fiber material forming said nonwoven sheet is selected from the group consisting of polyester, polyvinyl, polypropylene, polyamide and polyacrylic synthetic fibers.
Claim 3
Dependent Claim
43 words
The conveyor belt of claim 1, wherein said adhesive is composed of at least one rubber component and at least one fiber-philic component selected from the group consisting of an isocyanate compound, resorcin-formalin resin, epoxy compound, ethylene-urea compound, ethylene-imine compound and phenolic resin.
Claim 4
Dependent Claim
34 words
The conveyor belt of claim 4, wherein the fiber-philic component in said adhesive is present in an amount of no more than 25 percent by weight based on the weight of the rubber component.
Claim 5
Dependent Claim
22 words
The conveyor belt of claim 4, wherein sAid adhesive contains a solvent selected from the group consisting of hydrocarbons, benzene, and ketones.
Claim 6
Dependent Claim
17 words
The conveyor belt of claim 4, wherein said adhesive has a viscosity not higher than 150 p.s.i.g.
Claim 7
Dependent Claim
17 words
The conveyor belt of claim 4, wherein said adhesive has a viscosity not higher than 100 p.s.i.g.
Claim 8
Dependent Claim
101 words
A process for the preparation of a conveyor belt formed by pressing rubber covers onto the top and bottom of a core body, which comprises: needling a web of 200-1,000 g./m.2 formed of crimped and 40-120 mm. long staple fibers at a needling density of 50-250 times/cm.2; drawing the needled web in its longitudinal direction by at least 50 percent based on the original length to convert the web to a nonwoven sheet; impregnating the nonwoven sheet with an adhesive so as to produce the core body; and pressing rubber covers onto the top and bottom surfaces of said core body.
Claim 9
Dependent Claim
33 words
The process of claim 9, wherein the needled web is impregnated with said adhesive before drawing, and drawing of the adhesive-impregnated needled web is conducted before said adhesive is substantially dried or hardened.
Claim 10
Dependent Claim
58 words
The process of claim 9, wherein a web of 300-800 g./cm.2 formed of 45-90 mm. long staple fibers is needled at a needling density of 70-200 times/cm.2, drawn by at least 80 percent, and impregnated with an adhesive to an adhesive pickup of no less than 80 percent by weight 9, on the weight of the nonwoven sheet.
Claim 11
Dependent Claim
28 words
The process of claim 9, wherein the fiber material forming the nonwoven sheet is selected from the group consisting of polyester, polyvinyl, polypropylene, polyamide and polyacrylic synthetic fibers.
Claim 12
Dependent Claim
42 words
The process of claim 9, wherein said adhesive is composed of at least one rubber component and at least one fiber-philic component selected from the group consisting of an isocyanate compound, resorcin-formaline resin, epoxy compound, ethylene-urea compound, ethylene-imine compound and phenolic resin.
Claim 13
Dependent Claim
33 words
The process of claim 13, wherein the fiber-philic component in the adhesive is present in an amount of no more than 25 percent by weight based on the weight of the rubber component.
Claim 14
Dependent Claim
21 words
The process of claim 13 wherein the adhesive contains a solvent selected from the group consisting of hydrocarbons, benzene, and ketones.
Claim 15
Dependent Claim
16 words
The process of claim 13, wherein said adhesive has a viscosity not higher than 150 p.s.i.g.
Claim 16
Dependent Claim
16 words
The process of claim 13, wherein said adhesive has a viscosity not higher than 100 p.s.i.g.
References Cited (Backward Citations)
GB190701295A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |