Fluid sprinkling – spraying – and diffusing – With system fluid relief or return to supply
Reexamination Certificate
1997-02-28
2001-11-27
Crispino, Richard (Department: 1734)
Fluid sprinkling, spraying, and diffusing
With system fluid relief or return to supply
C239S500000, C239S520000, C239S589000
Reexamination Certificate
active
06322001
ABSTRACT:
TECHNICAL FIELD
The present invention refers to an ejection nozzle for transport of fiber thread pieces by means of compressed air e.g. reinforcement material for manufacturing fiber reinforced plastic products, from a cutter to a molding cavity, which nozzle is provided with a common flow duct for the compressed air and the fiber thread pieces.
BACKGROUND OF THE INVENTION
In robot-controlled production of fiber reinforced plastic products, fiber thread pieces are fed out into a molding cavity while being oriented, so that the strength of the fibers is utilized efficiently in the finished product. Compressed air is used for the transport of the cut fiber pieces from the cutter to the molding cavity.
If the pressure/speed of the compressed air is not sufficiently high at the center, static electricity will make fiber pieces stick to the vicinity of the cutter, so that the feeding out is stopped up. This may be economically seriously damaging if the operations at a production line, which depends upon the plastic details, is also influenced by the production loss.
However, if air pressure/speed is too high at the molding cavity, fiber pieces may be oriented wrongly in the cavity, simply by being blown away from their intended location, or because they are deflected from the mold surface by having too high kinetic a energy.
These problems can be reduced if it is possible to maintain an optimal distance between the feed out apparatus and the molding cavity. However, this is hardly ever possible, e.g. because of lack of space.
THE TECHNICAL PROBLEM
One object of the present invention is therefore to provide an apparatus for feeding out fiber thread pieces from a cutter, which makes it possible to maintain a high air pressure velocity at the cutter and at the same time avoid that the fibers end up wrong in the molding cavity, or outside the same.
THE SOLUTION
For this purpose, the apparatus according to the invention is characterized in that the flow duct runs past at least one reflector surface for the air flow, and that at least one opening for evacuation of air that has moved upstream past the reflector surface to the surroundings is located along the flow duct.
REFERENCES:
patent: 2086183 (1937-07-01), Gellner et al.
patent: 2761516 (1956-09-01), Vassilkovsky
patent: 3724762 (1973-04-01), Freshour et al.
patent: 3943329 (1976-03-01), Hlavac
patent: 3946947 (1976-03-01), Schneider
patent: 4178134 (1979-12-01), Babish et al.
patent: 1257352 (1961-02-01), None
patent: 9513992 (1995-05-01), None
Aplicator System AB
Crispino Richard
Ostrolenk Faber Gerb & Soffen, LLP
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