Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1991-09-09
1994-07-05
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264109, 264110, 249 35, B29C 6722, E04G 1500
Patent
active
053265130
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a process, and a device for implementing the process for the production of plastic fiber boards using balls of expanded glass, expanded clay, pumice granules, mica, or a similar material and a foamed organic binder such as epoxy resin, PU phenol resin, or the like, or an inorganic binder, which is mixed with the balls, foamed, and then hardened between two mold plates positioned from each other at a given distance while a matrix is formed.
In a process of this type known to the prior art (DE-OS 37 15 487) the expanded glass ball artificial resin mixture fills the entire space bordered by the level mold plate surfaces, with the exception of small air space between the expanded glass balls. The weight of such plastic fiber boards and the quantity of material needed for their production basically depends on the material compression achieved by pressure applied to the material before hardening. As cores of sandwich elements, plastic fiber boards of this type, in which the cover layers serve as tension elements, are highly stable and have a high load-bearing capacity.
BRIEF SUMMARY OF THE INVENTION
The object of the invention to provide a process and device for producing plastic fiber boards as cores of sandwich elements, with comparative low plate weight and without impeding the carrying capacity during processing.
The process according to the invention is basically distinguished by the fact that a number of uniformly distributed recesses open in the direction of the plates are located between the two mold plates for receiving the plastic mixture before compression and hardening.
It has proven to be the case that plastic fiber boards with an especially low weight can be produced with this process, and they can be subjected to high loads as sandwich structure cores, despite the large number of hollow spaces they contain.
The invention also provides to a device for producing plastic fiber boards having two mold plates which are brought together in a press to compact the introduced mixture, the device being distinguished by the fact that the surface of at least one of the two mold plates is provided with a number of uniformly distributed mold bodies, whose cross-section, running parallel to the surface of the mold plate, decreases in the direction of the other mold plate.
The mold bodies employed can be, for example, semi-spherical mold bodies. A more favorable use of material, i.e. a greater stability with reduced consumption of material, is assured when the mold bodies are conical in shape.
It has proven to be particularly advantageous if both mold plates are outfitted with mold bodies. It is expedient for the mold bodies of one mold plate to be positioned in displaced fashion relative to those of the other mold plate; so that when the mold plates are drawn together, the mold bodies of the one mold plate project into the interstices between the mold bodies of the other mold plate.
A particularly suitable employment and distribution of material can be achieved if the bases of the conical mold bodies of the one mold plate, when projecting into the other mold plate, overlap the bases of the mold bodies of the latter mold plate.
In mounting the mold bodies it has proven to be advantageous if each mold body is provided on its base side with a threaded blind hole to receive a securing screw penetrating the corresponding mold plate.
To properly secure the mold bodies to the mold plate even when they have a small diameter and to also assure a precise distribution of the mold bodies on either mold plate, it has proven to be effective to provide each conical mold body with a cylindrical foot whose diameter corresponds to the diameter of the conical base and to position beside each mold plate a perforated plate with holes, whose diameter matches the diameter of the conical bases. Here the perforated plate will expediently have a thickness corresponding to the height of the cylindrical feet of the conical mold bodies.
In an effective embodiment of the device accordin
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Kuhns Allan R.
Sto Poraver GmbH
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