METHOD FOR MANUFACTURING A COMPOSITE MATERIAL HAVING REDUCED MECHANOSORPTIVE CREEP, THE COMPOSITE MATERIAL, USE OF THE METHOD AND THE COMPOSITE MATERIAL

• US 20100193116A1
• Filed: 07/04/2008
• Published: 08/05/2010
• Est. Priority Date: 07/12/2007
• Status: Abandoned Application

• Current Assignee: Innventia AS
• Original Assignee: Innventia AB
• Inventors: Lindstrom, Mikael, Makela, Petri, Stenman, Anders, Iversen, Tommy, Wickholm, Kristina, Vomhoff, Hannes, Gamstedt, Kristofer, Lindstrom, Tom, Berthold, Fredrik
• Application Number:
  US12/668,046
• Publication Number:
  US 20100193116A1
• Time in Patent Office: Days
• US Class Current: 156/246
• CPC Class Codes: D21H 13/12 from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: D21H 13/24 Polyesters
• CPC Class Codes: D21H 25/005 Mechanical treatment D21H25/08, D21H25/18 take precedence
• CPC Class Codes: D21H 25/04 Physical treatment, e.g. heating, irradiating D21H25/18 takes precedence; dryer section of machines for making continuous webs of paper D21F5/00
• CPC Class Codes: D21H 27/14 Paper having stable form or dimension; Curl-resistant paper anticoil photographic support G03C1/81

Abstract

A method for manufacturing a composite material having reduced mechanosorptive creep includes the following steps:

a) mixing fibers of a lignocellulosic material with a thermoplastic material where the thermoplastic material is in fiber form; b) adding the mixture made in step a) onto a wet web, thus forming a composite material; and c) hot pressing of the composite material. The composite material having reduced mechanosorptive creep being the manufacturing result of the method, and the use of the method and the composite material are described.

Claims

1. A method for manufacturing a composite material having reduced mechanosorptive creep comprising the following steps:

a) mixing fibers of a lignocellulosic material with a thermoplastic material where the thermoplastic material is in fiber form,

b) adding the mixture made in step a) onto a wet web, thus forming a composite material and

c) hot pressing of the composite material using a minimum pressure force of 50 kPa.

2. A method according to claim 1 wherein the mixing in step a) is performed either during wet forming, preferably followed by a dewatering step, or during moulding.

3. A method according to claim 1 wherein the wet web is a paper web.

4. A method according to claim 1 comprising a step d) heat treating the composite material.

5. A method according to claim 1 comprising a step e) laying the composite material in layers, thus forming a composite material having two or more layers.

6. A method according to claim 1 wherein the pressing is performed by using two surfaces which are heated at a temperature close to the melt point of the thermoplastic material.

7. A method according to claim 1 wherein the mixture comprising fibers of the lignocellulosic material and the thermoplastic material is preheated before the pressing.

8. A method according to claim 1 wherein the thermoplastic material is a poly hydroxy alkanoate.

9. A method according to claim 1 wherein the thermoplastic material is selected from the group of PE, PP, PLA, PHV, PHA, PHB, CAP, CAB.

10. A method according to claim 1 wherein the thermoplastic material is PLA.

11. A method according to claim 1 wherein the fibers of the lignocellulosic material is mixed with the thermoplastic material where the thermoplastic material constitutes between 0.5 and 90% by weight of the mixture.

12. A method according to claim 1 wherein the fibers of the lignocellulosic material is mixed with the thermoplastic material where the thermoplastic material constitutes between 1 and 25% by weight.

13. A method according to claim 1 wherein the fibers of the lignocellulosic materials mixed with the thermoplastic material where the thermoplastic material constitutes between 1 and 10% by weight.

14. A method according to claim 1 wherein the fibers of the lignocellulosic materials mixed with the thermoplastic material where the thermoplastic material constitutes between 30 and 70% by weight.

15. A composite material having reduced mechanosorptive creep being the manufacturing result of the method according to claim 1.

16. A composite material according to claim 15 where the wet web is a paper web.

17. A composite material according to claim 15 wherein the thermoplastic material is a poly hydroxy alkanoate.

18. A composite material according to claim 15 wherein the thermoplastic material is selected from the group of PE, PP, PLA, PHV, PHA, PHB, CAP, CAB.

19. A composite material according to claim 15 wherein the thermoplastic material is PLA.

20. A composite material according to claim 15 in the form of a sheet.

21. A composite material according to claim 15 wherein the thermoplastic material constitutes between 0.5 and 90% by weight of the mixture.

22. A composite material according to claim 15 wherein the thermoplastic material constitutes between 1 and 25% by weight.

23. A composite material according to claim 15 wherein the thermoplastic material constitutes between 1 and 10% by weight.

24. A composite material according to claim 15 wherein the thermoplastic material constitutes between 30 and 70% by weight.

25-27. -27. (canceled)