Plastic and nonmetallic article shaping or treating: processes – Direct application of electrical or wave energy to work – Microwave
Patent
1998-06-12
2000-08-15
Aftergut, Karen
Plastic and nonmetallic article shaping or treating: processes
Direct application of electrical or wave energy to work
Microwave
264492, 264 87, 425 85, 4251744, 425356, B28B 126
Patent
active
061031798
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method of manufacturing a fibre product, the stock being prepared so that it has a predetermined fibre water concentration and contains predetermined additives and chemicals.
The invention also relates to an arrangement for manufacturing such a fibre product from a fibre stock which is briefly stored in a machine vat.
A machine for the moulding of fibre products in which a perforated male mould is immersed in a fibre suspension is already known from U.S. Pat. No. 3,850,793. The suspension water is sucked through the perforations by means of a vacuum, the fibres in the suspension catching on the surface of the mould. Once a layer of a certain thickness has been obtained on the mould this is moved to a station directly under a press, by means of which the excess water is pressed out, following which the product now obtained is blown away from the mould and subjected to final drying.
An arrangement for such final drying is already know, for example, from U.S. Pat. No. 3,624,806. Use is made here of heated air which is blown by fans through a drying oven, through which the products have to pass.
A male mould is already known from DE-C2-38 37 467. In this mould the perforations are formed by openings between spheres which are fixed to one another at their point of contact.
A problem with known arrangements for manufacturing a fibre product is that, in order for it to be profitable the product has to be manufactured in vary large quantities. This means that it has hitherto not been economically justifiable, for example, to use fibre packagings as an alternative to polystyrene (PS) or expanded polystyrene (EPS) packagings, which are relatively inferior from an environmental standpoint.
A customer for a fibre product usually wants to have his logotype placed at a suitable point on the product. In known arrangements of the above-mentioned type the finished product is provided with such a logotype in a special hot pressing operation.
This obviously means an increase in the cost of manufacture and the time taken to manufacture the product.
The object of the present invention is to arrive at a method of manufacturing a fibre product which means that the shape of the product can be easily modified, thereby permitting manufacture in short series, and that manufacture can be accomplished more quickly with a lower energy consumption and better surface finish than previously. According to the invention this is achieved through the following combination of measures: immersed in the stock in the moulding tank and fibres in the stock are induced by means of a vacuum to successively form the future product with a fibre layer of predetermined thickness, the male mould is then removed from the moulding tank and assumes a predetermined position, brought under force against the male mould in the said predetermined position so that a first pressing occurs, following which the fibre product is transferred to the female mould which is moved to a predetermined position, brought under force against the female mould in the said predetermined position, so that the fibre product is subjected to a second pressing, following which the female mould assumes a predetermined position in which the fibre product is released therefrom, microwave or IR radiation.
According to a special characteristic of the invention the product is provided with a logotype in the second pressing stage.
An arrangement for manufacturing a fibre product according to this method is characterised in that the arrangement comprises a combination of: collecting tank, adapted to pump an abundance of fibre stock from the machine vat to the moulding tank in such a way that excess stock is able to flow over the brim of the moulding tank and down into the collecting tank, first immerse a first male mould in the moulding tank, a fibre product with a certain layer thickness being produced on the tool in a manner known in the art by extracting the stock water, and thereafter to move the male mould to a first horizontal position, a pick-up unit ar
REFERENCES:
patent: 3250839 (1966-05-01), De Luca
patent: 3510394 (1970-05-01), Cadotte
patent: 3624806 (1971-11-01), Lytzen
patent: 3645320 (1972-02-01), Varrati
patent: 3850793 (1974-11-01), Hornbostel et al.
patent: 3870777 (1975-03-01), Jakel
patent: 4203936 (1980-05-01), Kiwak et al.
patent: 4683028 (1987-07-01), Waller et al.
patent: 5338169 (1994-08-01), Buckley
patent: 5364258 (1994-11-01), Buckley et al.
patent: 5641449 (1997-06-01), Owens
Aftergut Karen
Celtec Development AB
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