Process for recycling scrap of shoe stiffener

• US 20100147444A1
• Filed: 12/15/2008
• Published: 06/17/2010
• Est. Priority Date: 12/15/2008
• Status: Active Grant

• Current Assignee: Tien Ying Wu, Tsang I. Hsu
• Original Assignee: Tien Ying Wu, Tsang I. Hsu
• Inventors: Hsu, Tsang I, Wu, Tien Ying
• Granted Patent: US 7,846,284 B2
• Time in Patent Office: Days
• US Class Current: 156/94
• CPC Class Codes: B29B 17/0042 for shaping parts, e.g. multilayered parts with at least one layer containing regenerated plastic
• CPC Class Codes: B29B 17/0408 using cryogenic systems
• CPC Class Codes: B29C 48/0022 combined with cutting
• CPC Class Codes: B29C 48/022 characterised by the choice of material
• CPC Class Codes: B29C 48/04 Particle-shaped making granules B29B9/00
• CPC Class Codes: B29C 48/07 Flat, e.g. panels
• CPC Class Codes: B29C 48/08 flexible, e.g. films
• CPC Class Codes: B29C 48/15 incorporating preformed parts or layers, e.g. extrusion moulding around inserts
• CPC Class Codes: B29C 48/21 the layers being joined at their surfaces
• CPC Class Codes: B29K 2075/00 Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
• CPC Class Codes: B29K 2105/06 containing reinforcements, fillers or inserts
• CPC Class Codes: B29K 2105/0809 Fabrics
• CPC Class Codes: B29K 2105/26 Scrap or recycled material
• CPC Class Codes: B29L 2007/002 Panels; Plates; Sheets
• CPC Class Codes: B29L 2031/504 Soles
• CPC Class Codes: B32B 2250/40 Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
• CPC Class Codes: B32B 2272/00 Resin or rubber layer comprising scrap, waste or recycling material
• CPC Class Codes: B32B 2305/18 Fabrics, textiles
• CPC Class Codes: B32B 2305/70 Scrap or recycled material
• CPC Class Codes: B32B 2375/00 Polyureas; Polyurethanes
• CPC Class Codes: B32B 27/12 : next to a fibrous or filamentary layer
• CPC Class Codes: B32B 27/20 : using fillers, pigments, thixotroping agents
• CPC Class Codes: B32B 27/40 : comprising polyurethanes
• CPC Class Codes: B32B 37/153 : at least one layer is extruded and immediately laminated while in semi-molten state
• CPC Class Codes: B32B 5/022 : Non-woven fabric
• CPC Class Codes: B32B 5/024 : Woven fabric
• CPC Class Codes: B32B 5/26 : another layer next to it also being fibrous or filamentary relative arrangement of fibres or filaments of different layers B32B5/12
• CPC Class Codes: Y02W 30/62 : Plastics recycling; Rubber recycling

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.

Claims

1. 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.

2. 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.