Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With work cooling means
Patent
1993-08-24
1995-12-26
Johnstone, Adrienne C.
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
With work cooling means
156264, 156267, 156288, 1563074, 156510, 156512, 156516, 156517, 156538, 156539, 156580, 1565831, 1988033, 1988039, 226173, 271 7, 271205, B32B 3104, B32B 3118, B32B 3120
Patent
active
054779014
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
This invention relates to a process for the manufacture of high pressure laminates from artificial resin impregnated paper sheets in a single daylight hot press, whereby the pressed laminate consisting of paper sheets is held at several positions on both of its longitudinal edges by longitudinal moving clamp fixtures as it is transferred into or out of the single daylight hot press.
BACKGROUND OF THE INVENTION
High pressure laminates, particularly decorative laminates according to DIN 16926, (German Industrial Code) are manufactured from artificial resin impregnated paper sheets which are pressed in a hot press under high pressure. Usually, multi-daylight presses are used, which are fed with the desired cut to size, pressed laminate on carrier plates and placed between caul plates. Every press cycle, which consists of the heating and cooling of the press platens, requires a time period of about 1-2 hours. The necessity, at every press process, to use a large number of caul plates, imposes considerable cost related expenditures. The cyclical heating and cooling of the pressed boards leads to a high energy requirement.
In addition, there is a known process for manufacturing laminates (pressed boards) continuously in endless double-belt presses. In this case, the laminate supplied from an unwind stand is pressed between steel belts. The surface texturing in this case is accomplished by means of simultaneously running embossed paper webs, since the engraving of the steel belts and their conversion to different surface structures would be uneconomical.
The pressures attainable with double-belt presses are considerably lower than those attainable with discontinuous presses. In a known process of the initially named class (DE-PS 2 217 396), a single daylight hot press is used. The laminate for the manufacture of a single high-pressure laminate (pressed board) is picked up along its two longitudinal edges by two clamping strips which transfer the laminate into the hot press and release it there. After the pressing process, the laminate is again picked up by clamping strips and transferred out of the hot press. For that purpose, the clamping strips are moved back and forth in transfer direction. In that fashion only a single work station, namely the hot press, can be operated with the clamping strips. During each transfer process the laminate must be picked up against and released. During this process the laminate can be displaced.
SUMMARY OF THE INVENTION
It is the object of the invention to design a process of the initially named class in such a way that even relatively thin high-pressure laminates (pressed boards) can be manufactured with high pressures but with very short press strokes, which ensures the exact guidance of the laminate.
According to the invention, this objective is achieved by the clamping means consisting of individual transfer clamps attached to endlessly rotating transfer strands and that the laminate is continuously held and guided by the transfer clamps during the pressing process into the single daylight hot press and during transfer out of the single daylight hot press.
Since the laminate is constantly held and guided by the transfer clamps, there is not risk that prior to the pressing process the individual sheets are displaced in relation to each other or that the laminate is displaced in relation to the caul plates. This ensures that in the case of decorative laminates (pressed boards) the orientation of a possible decorative design is in accordance with the surface structure produced by the caul plates.
Through the exact and uninterrupted guidance of the laminate before, during and after the pressing process, an uneven temperature stress of the laminate is prevented with certainty.
A preferred embodiment of the invention provides for the laminate to be taken over by the transfer clamps in a loading station and transferred in stages into the single daylight hot press and into a subsequent cold press, while the transfer clamps remain closed.
This allows not onl
REFERENCES:
patent: 1329936 (1920-02-01), Spiess
patent: 2557492 (1951-06-01), Young
patent: 3073499 (1963-01-01), Middleton, Jr. et al.
patent: 3100637 (1963-08-01), Brown
patent: 3193881 (1965-07-01), Kostur
patent: 3726389 (1973-04-01), Klein et al.
patent: 3738556 (1973-06-01), Grebe
patent: 3828997 (1974-08-01), Snow
patent: 3909343 (1975-09-01), Posselt
patent: 3977535 (1976-08-01), Husges et al.
patent: 3987917 (1976-10-01), Husges et al.
patent: 4372899 (1983-02-01), Wiemann et al.
patent: 4392909 (1983-07-01), Bohn et al.
patent: 4543147 (1985-09-01), Noto et al.
patent: 4848533 (1989-07-01), Martin et al.
patent: 5035134 (1991-07-01), Fisch
International Preliminary Exam. Report from PCT Office dated Sep. 18, 1991.
Baranowski Klaus
Colyer Dennis
Kosa Charles
Muller Gert
Rudolf Reinhold
Johnstone Adrienne C.
Pathex International Ltd.
Resopal GmbH
LandOfFree
Apparatus for the manufacture of high pressure laminates does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for the manufacture of high pressure laminates, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for the manufacture of high pressure laminates will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1362948