Static molds – Including coating or adherent layer – Parting layer
Patent
1993-12-21
1995-10-03
Woo, Jay H.
Static molds
Including coating or adherent layer
Parting layer
249189, 264 31, 264130, 427359, 427393, 427408, E04G 905
Patent
active
054545455
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a concrete-form shuttering panel against which concrete is intended to be cast.
The invention also relates to a shuttering-panel contact layer and to a method for manufacturing shuttering panels.
Shuttering panels of this general kind are known. One problem experienced when concreting in this way resides in the difficulty of releasing the shuttering panels from the setting concrete after concreting. It is known to apply so-called form oil to the panel surface facing towards the concrete, prior to casting the concrete. This is expensive, however, owing to the time consumed in applying the oil and also due to the cost of the material consumed, and is also undesirable from an environmental aspect. Present-day shuttering panels are normally wood based, for instance plywood panels, among other things for reasons of cost and mechanical strength. Another advantage afforded by the use of wood-based panels is that they can be nailed. The known panels often have a surface coating, e.g. a plastic film coating, which is baked on the wood surface, or a plastic laminate which is glued onto the wood surface, or a plastic material reinforced with fibre glass. However, despite the presence of this surface coating, it is necessary to apply large quantities of form oil in order to enable the panel to be released from the concrete. One serious drawback with known wood-based panels is that the nail holes are permanent and allow moisture to enter the wooden panel, causing the panel to rot quickly.
The present invention relates to a shuttering panel and to a contact layer which solves the above-related problems.
Accordingly, the invention relates to a concrete-form shuttering panel against which concrete is intended to be cast and which is preferably wood-based, such as plywood, and therewith nailable.
The shuttering panel is mainly characterized in that the side of the panel which is intended to lie in contact with the concrete includes an elastic layer which will not adhere to the concrete to any significant extent.
The invention also relates to a contact layer for concrete-form shuttering panels, said contact layer being intended to lie against the cast concrete.
The contact layer is mainly characterized by an elastic layer which is intended not to adhere to the concrete to any significant extent.
The invention also relates to a method for manufacturing a concrete-form shuttering panel against which concrete is intended to be laid and which is preferably wood-based, such as so-called plywood, and which is provided on the side thereof intended for contact with the concrete an elastic layer which will not adhere to the concrete to any significant extent.
The method is mainly characterized by applying liquid elastic-layer forming material to one surface of a shuttering panel, preferably with the aid of one or more spray nozzles, and rolling the layer material to a desired thickness with the aid of a roller, such as a steel roller, wherein a release agent, such as a layer of Teflon.RTM., is preferably applied between the roller and the liquid contact-layer forming material.
The invention will now be described in more detail with reference to an exemplifying embodiment thereof.
The inventive shuttering panel is thus preferably wood-based, i.e. is comprised mainly of wood, such as so-called plywood, and the side of the panel which is intended to lie in contact with the concrete is provided with an elastic layer which will not adhere to the concrete to any significant extent, the layer material being chosen against this background. It has been found that some plastic materials possess properties which enable concrete to be laid in contact with these materials without the materials binding or adhering to the concrete. This enables the material to be quickly and easily separated from the concrete when the concrete has set.
According to preferred embodiments, the layer is formed from a polymer-based material, a rubber-based material or the like.
Preferred materials are those which are able to withstand
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Davis Robert P.
Woo Jay H.
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