Coating processes – With cutting – holding – severing – or abrading the base
Patent
1998-05-29
1999-09-07
Bareford, Katherine A.
Coating processes
With cutting, holding, severing, or abrading the base
4274344, 4274347, 118405, 118420, 156296, 156441, B05D 118, B05C 3172
Patent
active
059484730
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for preparing a resin-impregnated structure, which comprises opening a bundle of substantially endless continuous fibers and then impregnating the resultant open bundle with a resin; a method for producing columnar products from the resin-impregnated structure thus prepared; and an apparatus for opening a bundle consisting of continuous fibers and, simultaneously, impregnating it with a resin.
BACKGROUND ART
There have already been known a number of methods and apparatuses for producing a resin-impregnated structure reinforced with continuous fibers by contacting, in a zigzag pattern, a continuous fiber bundle serving as a reinforcing material with the surfaces of a plurality of opening means arranged in series within an apparatus for opening and resin-impregnation (or by making them run around the means) and simultaneously impregnating the opened (or loosed) continuous fibers with a molten resin. For instance, a variety of techniques are disclosed in the patent publication listed below.
It can be understood from the disclosures thereof that continuous fiber bundles are brought into contact with (opening) pins or (opening) rolls for opening and resin-impregnation of the continuous fiber bundle, in either of these techniques. It has been proven that, as a result, the continuous fibers are damaged to a substantial extent, that this in turn leads to the formation of fluff and that it is thus difficult to stably produce resin-impregnated structures reinforced with continuous fibers. Each publication will hereinafter be described in more detail. specification) and the Related Written Decision (Trial Case No. 2 (1990)-17153).
The gazetted specification and the written decision disclose or propose a method which comprises passing, under tension, reinforcing fiber bundles arranged in a band-like pattern through a spreader while bringing the bundles into contact with the surface of the spreader, and while supplying a thermoplastic polymer having a melt viscosity of less than 100 Ns/m.sup.2 to a nip formed between the reinforcing fiber bundles and the spreader, to thus impregnate the fiber bundles with the polymer. Specification)
In this gazetted specification, there is proposed a method for impregnation, which comprises arranging or spreading fiber bundles in a web-like (this term is identical to "band-like") pattern, then coating the bundles with a molten resin and thereafter passing the coated fiber bundles through a specific zigzag barrier region within an apparatus for opening and resin-impregnation. specification)
This gazetted specification proposes a method for impregnation, which comprises extruding a molten resin through the tip of a bow head of an extruder and simultaneously passing a series of fibers, under tension, through the bow head while bringing the fibers into contact with the bow head. specification)
This gazetted specification proposes an impregnation method in which a choking structure is provided in the course of a flow path for fibers in an apparatus for opening and resin-impregnation and the fibers are brought into contact with the choking structure to thus subject the fibers to opening and to simultaneously impregnate them with a resin.
These methods can certainly provide resin-impregnated structures uni-directionally reinforced, which are excellent in resin-impregnation ability. In all of these methods, however, the fibers would severely be damaged since the reinforcing fiber bundles pass through (around) pins or projected portions while bringing the bundles into contact with the pins or projections. It has been found that, as a result, the methods have a problem that fluffs are easily formed due to breakage of fibers. The formation of fluffs would impair any stable productivity of the intended resin-impregnated structure and ultimately leads to the interruption of the apparatus for opening and resin-impregnation. specification)
This gazetted specification proposes an impregnation method which comprises pressing fiber bundle thr
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patent: 4728387 (1988-03-01), Hilakos
patent: 4864964 (1989-09-01), Hikalos
patent: 4883625 (1989-11-01), Glemet et al.
Ishikawa Masanori
Saito Koichi
Sakai Yasuhiro
Yonaiyama Rikio
Bareford Katherine A.
Chisso Corporation
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