Reconstituted leather product and process

• US 6,264,879 B1
• Filed: 06/04/1999
• Issued: 07/24/2001
• Est. Priority Date: 06/05/1996
• Status: Expired due to Term

• Current Assignee: Mat Incorporated
• Original Assignee: Mat Incorporated
• Inventors: Karpik, Joseph, Addie, Benjamin A.
• Primary Examiner(s): THEISEN, MARY LYNN F
• Application Number:
  US09/326,208
• Time in Patent Office: 781 Days
• Field of Search: 264/518, 264/115, 264/122, 264/121, 264/913, 524/11, 428/904
• US Class Current: 264/518
• CPC Class Codes: B29C 70/502 by first forming a mat composed of short fibres
• CPC Class Codes: B29K 2711/08 Leather
• CPC Class Codes: C08L 89/06 derived from leather or skin , e.g. gelatin
• CPC Class Codes: C14B 7/00 Special leathers and their manufacture
• CPC Class Codes: D04H 1/60 the bonding agent being applied in dry state, e.g. thermo-activatable agents in solid or molten state, and heat being applied subsequently
• CPC Class Codes: D06N 3/0015 using fibres of specified chemical or physical nature, e.g. natural silk
• CPC Class Codes: Y10S 264/913 From fiber or filament, or fiber or filament containing article or product, e.g. textile, cloth fabric, carpet, fiberboard
• CPC Class Codes: Y10S 428/904 Artificial leather

Abstract

A reconstituted leather product and process for making. The reconstituted leather product can be finished to have the look and feel of real leather and physical properties equivalent thereto. The process is essentially dry and involves reducing leather materials to fibers, preferably not longer than one inch. The process further involves blending these fibers with synthetic fibers, a resin and optionally other additives, forming the mixture into a mat, curing the mat and pressing the mat into a reconstituted leather product.

Claims

1. A process for preparing a reconstituted leather product comprising the steps of

a) blending leather fibers with bonding fibers and resin to form an essentially dry homogenous dispersion, wherein leather fibers are at least 50% of the total amount of fibers blended by weight and the bonding fibers are at least 20% by weight of the total fiber amount;

b) forming the blended mixture into a formed mat; and

c) curing the resin in the formed mat to produce a reconstituted leather product by an essentially dry process where the reconstituted leather product at the end of the product'"'"'s useful life is capable of being used as a starting material in the formation of the reconstituted leather product.

2. The process of claim 1, further comprising the step of reducing leather materials to leather fibers.

3. The process of claim 2, the step of reducing leather materials to fibers comprising processing leather materials within a granulator.

4. The process of claim 3, further comprising refining the leather materials following processing within the granulator.

5. The process of claim 4, further comprising metering the leather materials prior to refining.

6. The process of claim 5, further comprising heating the leather materials and exposing the leather materials to steam to increase the moisture content of the leather materials prior to refining.

7. The process of claim 6, further comprising drying the leather materials following refining to reduce the moisture content to below 25% by weight.

8. The process of claim 1, wherein the step of forming comprises an air-laid forming process.

9. The process of claim 8, the air-laid forming process comprising:

a) metering leather materials for processing at a forming head;

b) doffing leather materials proximate to an air bridge;

c) condensing the leather materials through the use of air pressure and a vacuum to form a matt;

d) heating the leather materials through exposure to heated and pressurized air and exposure to a vacuum;

e) compressing the heated mat; and

f) exposing the mat to a hot-press.

10. The process of claim 9, further comprising processing the leather fibers within a lickerin.

11. The process of claim 10, further comprising heating of the mat within a curing oven having a vacuum positioned below the mat and exposing hot air to the top of the mat.

12. The process of claim 11, further comprising melting the bonding fibers within the curing oven and exposing the mat to compression rollers.

13. The process of claim 12, further comprising cooling of the compressed mat prior to exposure to a hot-press.

14. The process of claim 13, further comprising melting the resin within the hot press and dispersing the melted resin throughout the mat by pressing.

15. The process of claim 14, further comprising cooling of the mat.

16. The process of claim 1, wherein at least 50% of the leather fibers are at least about 0.25 inch and not greater than about 1.0 inch in length.

17. The process of claim 1, wherein said blending further comprises blending with additive fibers.