Plastic article or earthenware shaping or treating: apparatus – Means applying electrical or wave energy directly to work – Electro-static or inductive field
Patent
1990-03-19
1992-06-02
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Means applying electrical or wave energy directly to work
Electro-static or inductive field
219 1081, 264 25, 425233, 425407, B29C 3514, B29C 4352
Patent
active
051182750
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an arrangement for producing an elongated object which is comprised, inter alia, of a fibrous material, and relates more specifically, although not exclusively, to an arrangement of the kind in which the elongated fiber-containing object is produced by compressing a quantity of fibrous material provided with a moist binder and drying the compressed fibrous material/binder mixture, by passing said mixture between the electrodes of a drier which is active at high frequencies.
2. Description of the Related Art
Swedish Patent Specification published under publication number 415 547 teaches an arrangement for producing an elongated object or product, in which fibre (or fiber) material provided with a binder is compressed, by feeding a proportion of the total amount of fibre material for the whole object to a compression chamber provided with compressing means. The compressing means is then activated so as first to compress said proportion of fibre material and then push said material into a matrix. The compression means is then withdrawn from the compression chamber so that a further proportion of fibre material can be delivered thereto and compressed and displaced by the compressing means.
According to the above mentioned Swedish patent specification, the matrix shall include a plurality of wall sections and at least one of those wall sections shall be arranged for movement relative to the object, with said relative movement being directed in the direction of the longitudinal axis of the object or in the production direction.
The U.S. Pat. No. 4,673,345 teaches the use of a heating arrangement in the form of a high frequency drier with an arrangement of the kind taught by the aforesaid Swedish patent specification.
SUMMARY OF THE INVENTION
Technical Problems
When considering the present state of the art as described above it will be realized that when the heating arrangement comprises a high-frequency drier, a technical problem as to how to avoid or at least substantially prevent, the precipitation of condensation on cold surfaces, particularly when starting up the drier. Such condensation impairs the working of the drier and is also likely to render the drier components defective.
When considering the above technical problem, it will be seen that a further technical problem resides in realizing that said problem can be solved by preheating the electrodes.
Another technical problem is one of realizing that a heating arrangement which is used to preheat the electrodes can also be used to impart smoother surfaces to the finished product.
It will also be seen that a technical problem resides in the provision of an electrically operated, electrode-heating device in a high-frequency active drier while reducing the effect from the generation of voltage in the drier as a result of the electrical conductors serving the heating arrangement and located in the electromagnetic field.
Another technical problem is one of providing means for removing by suction air laden with water vapour (or vapor) from a cavity enclosed by the electrodes and a cavity surrounding the electrodes, in such a way that while enabling moisture containing air to be removed from said cavities the electrodes will not be cooled to an undesirable extent in the process. This implies that the quantity of water vapour removed by suction shall be adapted to the water vapour (steam) generated at that moment in time.
A further technical problem is one of being able to arrange a plurality of heating devices in the immediate vicinity of the electrodes while, at the same time, enabling the electrodes to be supported against an insulating glass composite material.
When using a composite glass material, which is intended to support the electrodes and to form two mutually opposing matrix walls, it will be seen that there is a technical problem in providing for suitable displacement of the matrix walls and the electrode within the drier relative to the material produced,
REFERENCES:
patent: 3791906 (1974-02-01), Farkas
patent: 3874207 (1975-04-01), Lemelson
patent: 4242687 (1980-12-01), Bahl
patent: 4244894 (1981-01-01), Segransan et al.
patent: 4352709 (1982-10-01), Urai et al.
patent: 4427865 (1984-01-01), Watanabe
patent: 4548772 (1985-10-01), Kawatnata
patent: 4577077 (1986-03-01), Kawamata
patent: 4673345 (1987-06-01), Andersson
patent: 4801778 (1989-01-01), Mizutari et al.
Nguyen Khanh P.
Woo Jay H.
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