Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With coupling between charger and mold
Patent
1982-10-01
1985-01-29
Hoag, Willard E.
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With coupling between charger and mold
425570, 425572, 425588, 425589, 425595, B29C 100
Patent
active
044963041
DESCRIPTION:
BRIEF SUMMARY
A carrying board formed, for example, by a wooden or plywood plate is known to be used in mass production on line of, for example, concrete products such as paving stones, curb stones, wall blocks and the like. In this process a templet is lowered onto the supported board and subsequently filled with mortar, after which the templet is removed, leaving behind the moulded product to cure. At the end of the production line the products lying at intervals on the board are shifted towards one another by clamping jaws and removed, whilst being clamped, from the board. Mechanical damage will thus soon arise, for example, indentations due to pressing down the templets and heavy wear due to shifting together the moulded products prior to removal. As a result of such mechanical damage the lifetime of such a known board is limited.
The invention relates to and provides in the first place a method of renovating a worn-out and/or damaged carrying board, in which method a mechanically strong coating is applied at least to the top face, as the case may be, after replacement of unusable parts. It should be noted here that for example, a known board already in use is provided with a coating in accordance with the teaching of this invention. This possibility of renovation brings about an additional advantage in that the user is not confronted with the problem of removing carrying boards having become unusable.
If, for example, a polyester resin is used for the coating, the user will be able to repair minor damage himself. For example, a paste may be used which contains glass fibre, which is applied together with a curing agent to the plate to be repaired, the plate being subsequently smoothed by means of a palette knife.
When a synthetic material is employed, the mould is determinative of the thickness and smoothness of the final carrying board. Thus these properties can be satisfactorily controlled, which is particularly important in an automated manufacturing process.
Shaping polyester resin in a mould has the disadvantage that polyester resin tends to stick to the walls of the mould cavity. Therefore, the mould cavity is greased with a detacking agent. This is a circuitous job and when it is carelessly carried out, the sticking problem does nevertheless occur.
The invention provides a method in which said problems are avoided in that liquid polyester resin is introduced into a mould, the cavity of which is bounded by polyethene.
The invention relates to and provides furthermore a mould having a cavity for shaping synthetic resin. This mould is characterized in that the mould cavity is bounded by polyethene. Particularly effective is high density polyethene.
Since this material does not readily adhere to other mould parts, a preferred embodiment of a mould according to the invention is characterized in that the edges of at least one polyethene plate are inserted into a groove of frame fillets and secured to the frame fillets by means of fastening means transversely directed to the groove.
A stationary seal between frame fillet and plate is obtained when at least one plate of polyethene, preferably high density polyethene is secured to a frame fillet and the frame fillet is in sealing relationship with the plate by means of a tag provided on the frame fillet.
The invention furthermore relates to and provides a device for applying a coating to carrying boards, said device being characterized by at least one carrier to which at least one mould can be fastened in a sloping position, the synthetic resin inlet being located on the lower side and a synthetic resin outlet on the top side of the mould cavity.
The above-mentioned and further features of the invention will be described with reference to a drawing of some examples and preferred embodiments. The drawing shows in
FIG. 1 a perspective view of a first embodiment of a carrying board in accordance with the invention,
FIG. 2 a perspective view, partly broken away, of a second embodiment of a carrying board in accordance with the invention,
FIG. 3 a perspective view, partly
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