Process and apparatus for compressing and packaging filament tows
AssigneeHoechst Aktiengesellschaft
InventorSiegfried Rewitzer
Life of this patent
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Abstract
The invention provides a process for compressing filament tows to bales and packaging them with flexible packaging material and reinforcing strips by means of a novel baling press, the press ram of which is divided into a core ram (4) and a surrounding outer ram (5), so that the relative positions of these two rams may be varied during the compression operations. By means of fingers (10), the collar of packaging material formed on compression can be bent in such a manner when lifting the outer ram (5) that on renewed lowering of the outer ram (5) strip-reinforcement is not hindered any more. Bales of high unit weight are obtained which allow trouble-free processing of the filament tows.
Claims10
A process for making a compressed bale of a filament tow encased in a flexible sheet packaging material by compressing a mass of said tow in a baling press having a pressure chamber and a reciprocating composite ram in said chamber, said ram comprising a central piston and a relatively movable peripheral piston, said process comprising the steps of positioning in said pressure chamber a partially compressed mass of said tow encased in said sheet packaging material, advancing said ram to compress said bale and form a collar of said packaging material between the periphery of said ram and the internal surface of said pressure chamber, retracting said peripheral piston to a point beyond said collar, bending said collar inwardly and thereafter advancing said peripheral piston to force said collar against the upper surface of said bale.
A baling press adapted to be used in compressing filament tows into a bale and encasing the bale in a flexible sheet packaging material, said press comprising in combination a pressure chamber, a composite ram reciprocable in said pressure chamber to compress a mass of filament tow encased in said packaging material within said chamber, means for driving said ram to compress said packaged tow within said chamber and form a collar of said packaging material between said piston and the interior of said chamber, said composite ram comprising a central piston for maintaining pressure on said bale and a relatively movable peripheral piston that is retractable with respect to said central piston to a position beyond said collar, means for bending said collar inwardly toward the upper surface of the compressed bale when said peripheral piston is in its retracted position and means for thereafter advancing said peripheral piston to further compress the peripheral portion of said bale.
A baling press adapted to be used in compressing filament tows into a bale and encasing the bale in a flexible sheet packaging material secured with reinforcing strips, said press comprising in combination an end plate and said walls defining a pressure chamber, a composite ram reciprocable in said chamber and means for moving said ram within said chamber to compress a packaged bale of tow therein against said end plate, said composite ram including a central piston and a relatively movable peripheral piston, whereby the pressures exerted on the central portion and on the peripheral portion of said packaged bale may be separately adjusted, said end plate, said central piston and said peripheral piston having transverse passages extending therethrough communicating with the external surface of the compressed bale whereby reinforcing strips can be passed through said passages to encircle said bale and secure it in its compressed state.
Dependencies are inferred from the claim text.