Textiles: manufacturing – Thread finishing – Surface modification of running length
Patent
1997-12-22
2000-03-07
Vanatta, Amy
Textiles: manufacturing
Thread finishing
Surface modification of running length
226 974, D01D 1102
Patent
active
060323426
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a new technology for producing a spread sheet made of a multi-filament (also including a tow spread sheet) comprising plural filaments combined together, more specifically, it relates to an epoch-making method of efficiently mass-producing a high-quality multi-filament spread sheet whose filaments are spread in such a manner that they are orderly disposed in parallel to each other without the quality deterioration by using a ready-made multi-filament as a production material, for instance, such a multi-filament spread sheet as being excellent in impregnation with resin and filament alignment which are indispensable for a supplemental fiber material for reinforcing a matrix so as to produce a complex material and the apparatus used in the same as well as the multi-filament spread sheet produced in the same.
In recent years, there have been developed and sold on the market a number of complex materials where a carbon fiber, a glass fiber or aromatic polyamide filament such as KEVLAR 49 are mixed with a matrix such as a synthetic resin and the like or interposed between the layers of the matrix for reinforcement.
Because those complex materials show excellent performance in such aspects as durability, heating and corrosion resistance, electrical characteristics and weight reduction, such various industries as aerospace, inland transportation, shipping, construction, civil engineering, industrial parts production, sports goods are selectively using such complex materials as mentioned above in accordance with their type of production so that those complex materials are in acute demand on the market.
In this connection, there are such practical forms of use of those fibers for reinforcing a matrix as plural filaments either disposed in a required width or cut off in a fixed size or processed in cloth status like woven, knitted, braided fabric or nonwoven fabric. Those fibers are either directly complexed with a matrix or processed into a work-in-process called preimpregnation by impregnating a sheet or a woven fabric and so forth on which plural filaments are regularly disposed with a synthetic resin. After the required number of said works-in-process is piled up one over another, they are processed into a finished product by means of a device such as an autoclave.
By the way, the most conspicuous complex materials in recent years above all are such high-function fiber materials as the aforesaid carbon fiber, aromatic polyamide filament and ceramic fiber which are used for reinforcing a matrix such as a synthetic resin. Those high-function fiber materials are normally supplied in multi-filament status where plural filaments are bundled and adhered together with a sizing agent. In the event where such multi-filaments as mentioned above are put to use as supplemental fiber materials for reinforcing a matrix, it is necessary to structurally strengthen adhesion between each filament and said matrix by enlarging the contact area therebetween. In order to satisfy this requirement, it is effective to thinly spread those multi-filaments in sheetlike shape. In other words, a complex material can not play its effective and important role without being structured in such a manner that the surface of each filament attaches to and firmly clings to a matrix.
However, in fact, it is extremely difficult to uniformly impregnate the interval between adjoining filaments with a matrix especially in the event where a multi-filament is used as a supplemental fiber material for reinforcing said matrix. Thus, in order to solve the aforesaid issue, said multi-filament is thinly spread in sheetlike shape within a fixed width so that the interstices among the filaments are impregnated with a matrix such as a synthetic resin.
In this connection, a conventional way of flatly spreading a multi-filament is performed during the process where said multi-filament is released from a yarn supply section and goes on to be wound on a yarn winding cylinder. The following methods for that p
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Kawabe Kazumasa
Tomoda Shigeru
Fukui Prefecture
Snider Ronald R.
Vanatta Amy
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