Process for recycling scrap of shoe stiffener
OwnerTsang I Hsu, Tien Ying Wuinventors
Life of this patent
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Abstract
A process for recycling scrap of shoe stiffener comprising the steps of: 1. Kneading the collected scrap of shoe stiffener, having a core layer of TPU resin material (with filler) sandwiched in between two opposite net fabric layers, to be dense clumps; 2. Freezing the dense clumps to be hard frozen clumps; 3. Crushing the hard frozen clumps to be a crushed product including pellets of resin material, and short fibers; and 4. Extruding the crushed product including pellets and short fibers to produce a regenerated core layer; and covering or laminating two net fabric layers on opposite sides of the regenerated core layer to obtain a regenerated shoe stiffener sheet to enhance environmental protection and prevent from wasting of material resources.
Claims2
A process for recycling scrap of shoe stiffener consisting of a core layer with thermoplastic polyurethane and filler resin materials, an upper and a lower reinforcing net fabric layer having long filaments contained therein and disposed on opposite sides of said core layer, said process comprising the steps of:
- (1) Kneading scrap of shoe stiffener, as collected, by a kneader at a temperature of 60° C.˜150° C. and compressing, under cooling, the scrap to be a plurality of dense clumps;
- (2) Freezing the dense clumps at a low temperature ranging 0° C.˜−20° C. to be frozen clumps which are hard and brittle at the low temperature;
- (3) Crushing the frozen clumps to be a crushed product including pellets of resin materials and short fibers as being cut from the long filaments contained in the upper and low net fabric layers;
- and
- (4) Extruding the crushed product through a T-die of an extender to form a regenerated core layer, and laminating two reinforcing net fabric layers on opposite sides of the regenerated core layer to produce a regenerated shoe stiffener sheet having the core layer sandwiched in between the upper and lower reinforcing net fabric layers.
A process for recycling scrap of shoe stiffener consisting of a core layer with thermoplastic polyurethane and filler resin material, an upper and a lower reinforcing net fabric layer having long filaments contained therein and disposed on opposite sides of said core layer, said process comprising the steps of:
- (1) Kneading scrap of shoe stiffener, as collected, by a kneader at a temperature of 60° C.˜150° C. and compressing, under cooling, the scrap to be a plurality of dense clumps;
- (2) Freezing the dense clumps at a low temperature ranging 0° C.˜−20° C. to be frozen clumps which are hard and brittle at the low temperature;
- and
- (3) Crushing the frozen clumps to be a crushed product including pellets of resin materials and short fibers as being cut from the long filaments contained in the upper and low net fabric layers.
Dependencies are inferred from the claim text.