Plastic and nonmetallic article shaping or treating: processes – Treatment of material by vibrating – jarring – or agitating... – Continuously formed or indefinite length article
Patent
1991-11-14
1993-11-23
Aftergut, Karen
Plastic and nonmetallic article shaping or treating: processes
Treatment of material by vibrating, jarring, or agitating...
Continuously formed or indefinite length article
156166, 156180, 156441, 264172, 264173, 264174, 264257, 264258, 425197, B28B 108, B29C 4706, B32B 3104
Patent
active
052641708
DESCRIPTION:
BRIEF SUMMARY
This invention relates to in-line core-filled pultruded profiles.
One form of pultruder for the manufacture of in-line core-filled pultruded profiles is known from International Patent Specification No W088/08367 which discloses an arrangement in which the dry materials are fed along a generally horizontal path to a pultrusion die where a bonding resin is injected in a manner which effects complete resin wet through so that the resultant product which emerges from the die has excellent filler bonding and surface finish. The dry materials comprise particulate core filling materials (such as silicate hollow spheres, vermiculite and many more and of varying relatively light weights) which are borne along the horizontal path by an air stream generated by a variable output Venturi blower. The path extends through the interior of a duct which tapers along its length and externally is shaped progressively to conform to the cross-sectional shape of the die. The exterior surface of the duct acts as a guide for runs of dry cloth which are fed to the die to provide a cloth skin as an integral part of the resultant pultrusion.
It is an object of the present invention to provide a new and improved system of manufacturing pultruded profiles having a skin resin-bonded to a core.
According to the present invention there is provided a system of manufacturing pultruded profiles having a skin resin-bonded to a core, comprising separately feeding core-forming materials and a skin-forming cloth to the inlet of a pultrusion die station which includes a resin-curing die having a cross-sectional shape for determining the cross-sectional shape of the profile, the core-forming materials being delivered to the die station inlet through the interior of a hollow duct and the skin-forming cloth being delivered over the external surface of the duct to the die station inlet, introducing bonding resin to said station, and pulling from the outlet of said station an in-line cored resin-bonded profile, characterised in that the hollow duct is essentially vertically disposed and the core-filling materials are moved through the duct under the influence of gravity to the die station.
By virtue of the present invention the core-filling materials are not propelled by an air stream so that the apparatus is simpler than hitherto by the absence of a variable output Venturi blower and the vertical disposition of the duct with gravity feed of the core filling materials renders the system insensitive to the specific weight of these materials. Accordingly a much wider weight range of such materials can now be used. Furthermore it is comparatively easy to achieve an even distribution of these materials across the cross-sectional area of the profile. This may be achieved, for example, by means of a vibratory screen at the top of the duct.
The present invention also provides a system of manufacturing tubular pultruded profiles having internal and external skins resin-bonded to a core, comprising separately feeding core-forming materials and skin-forming cloths along substantially vertical pathways to the inlet of a pultrusion die station which includes a resin-curing die having a cross-sectional shape for determining the external cross-sectional shape of the profile and a vertically-disposed mandrel having a cross-sectional shape for determining the internal cross-sectional shape of the profile, the external skin-forming cloth being delivered to the die station inlet over the external surface of a vertically-disposed hollow duct which surrounds the mandrel, the internal skin-forming cloth being delivered to the die station inlet over the external surface of the mandrel, and the core-forming materials being delivered under the influence of gravity to the die station inlet through the annular space between the duct and the internal skin-forming cloth.
It will be appreciated that the manufacture of tubular pultruded profiles is rendered practical by the absence of an air stream to carry the core-forming materials and this in turn is rendered practical by grav
REFERENCES:
patent: 2751320 (1956-06-01), Jacobs et al.
patent: 2887721 (1959-05-01), Blanchi et al.
patent: 3185747 (1965-05-01), Boggs
patent: 3235429 (1966-02-01), Boggs
patent: 3249481 (1966-05-01), Boggs
patent: 3256559 (1966-06-01), Boggs
patent: 3374132 (1968-03-01), Boggs
patent: 3769127 (1973-10-01), Goldsworthy et al.
patent: 4436682 (1984-03-01), Knopp
patent: 4685873 (1987-08-01), Willard et al.
patent: 4790257 (1988-12-01), Schermutzki
patent: 5120380 (1992-06-01), Strachan
Aftergut Karen
Caledonia Composites Limited
LandOfFree
Method of manufacturing pultruded profiles does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of manufacturing pultruded profiles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of manufacturing pultruded profiles will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1846415