Expandable pintle wires

Details Expandable pintle wires Expandable pintle wires

1999-06-24

2001-04-10

Sakran, Victor N. (Department: 3626)

Buckles, buttons, clasps, etc.

Belt fasteners

Hinged

C024S03300F, C024S03300F, C024S03300F

Reexamination Certificate

active

06212739

ABSTRACT:

BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
This invention relates to pintle wires, used for joining the ends of belts to form endless fabrics, for example in paper machine clothing, particularly press felts, by being passed through interdigitated loops from each of the respective ends.
The loops, which may be for example integral yarns from the base structure fabric, or in the form of a helical coil, sewn or integrated into the base structure of the belt or in the form of interlocking molded parts woven, cast or bonded into the base structure are provided on each end of the belt, so that the loops of the coil can be interdigitated, and substantially aligned for passage of the pintle wire through the interdigitated loops. Problems frequently occur with undesirable marking of the paper web, in the area where it is supported by the belt over the region where the belt ends abut and are joined by the seam comprised by the loops and pintle wire. A common cause of this marking is the fact that the belt has a much greater permeability in the seam region than elsewhere, leading to a variation in drainage.
SUMMARY OF THE INVENTION
The pintle wire itself may be a monofilament, multifilament of spun yarn, or a combination of one or more of these to form a twisted, cabled, plied or braided yarn which may optionally contain filler fibres. The pintle wire material is typically a synthetic polymer, although natural materials or minerals may be used, or even a combination of two or more of these materials. The pintle wire may be stiffened by treatment with resin or combination with a metal wire.
An object of this invention is to provide an embodiment of pintle wire for a seam whose tendency to mark a paper web carried on a paper machine clothing belt is substantially reduced.
According to the invention, a pintle wire includes or consists of at least one strand or filament of a material which can be expanded by physical or chemical means after introduction of said pintle wire to join a respective end seam.
A pintle wire according to the invention may be a monofilament, multifilament or spun yarn, or a combination of one or more of these to form a twisted, cabled, plied or braided yarn which may optionally contain filler fibres at least one of the yarn, filament, of fibre components being expandable after introduction of the pintle wire into the belt seam formed by the interdigitated loops.
The expandable component may be an intumescent yarn which swells under the influence of heat, typically comprising at least one core yarn encapsulated in a resin containing a foaming agent. This core yarn is preferably a multifilament due to the greater surface area creating better adhesion between the resin and the resin coating, although a twisted, cabled, braided or plied yarn, or even a monofilament, may be used. Alternatively there may be no core yarn, the component being wholly of a synthetic material including a foaming agent.
The expandable component may contain foaming agents which are thermally activated, or the trigger for the foaming reaction of such agents may be a source other than heat, for example a chemical reaction brought about by contact with water.
Other possible forms of expandable components include pre-stretched yarns, which increase in diameter after the release of longitudinal tension, and absorbent fibres, which take up water (by means for example of a superabsorbent or hydrophilic coating or fibrous sheath on a core filament) and thereby increase in girth. Natural fibres such as cotton or wool may used for this purpose.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
Embodiments of the invention will now be described by way of example with reference to the accompanying drawings, wherein:


REFERENCES:
patent: 4381612 (1983-05-01), Shank
patent: 4500590 (1985-02-01), Smith
patent: 4551378 (1985-11-01), Carey, Jr.
patent: 4863786 (1989-09-01), Green et al.
patent: 5049425 (1991-09-01), Essele
patent: 5079807 (1992-01-01), Hood
patent: 5169570 (1992-12-01), Sayers et al.
patent: 5503195 (1996-04-01), Edens, Jr.
patent: 5514438 (1996-05-01), Crook, Jr.
patent: 0 405 034 (1991-01-01), None
patent: 0 445 708 (1991-09-01), None
patent: 0 529 506 (1993-03-01), None
patent: 0 695 827 (1996-02-01), None
patent: 2 032 483 (1980-05-01), None

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