Composite structure with vibrational properties

Patent metadata

Field	Value
Publication number	US-9976005-B2
Application number	US-201214439829-A
Country	US
Kind code	B2
Filing date	Nov 1, 2012
Priority date	Nov 1, 2012
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

The application relates to a composition and manufacturing and a use of a composite structure having vibrational properties and to a product thereof. According to an embodiment a composition comprises a matrix material and organic natural fiber material, wherein speed of sound is arranged to be different in different directions in the composition.

First claim

The invention claimed is:

1. A composite comprising a melt flow direction, the composite comprising
thermoplastic polymer matrix material, and
fiber components with a hollow interior, wherein the fiber components are chemically treated particles of organic natural fiber material comprising cellulose from kraft process,
wherein at least part of the fiber components in the composite have been oriented substantially parallel with a direction of the melt flow, such that the speed of sound in a direction perpendicular to the melt flow is at least 10% less than in a direction of the melt flow.

2. The composite according to claim 1 , wherein the speed of sound is below 1800 m/s in at least one direction in the composition.

3. The composite according to claim 1 , wherein ratio of the speed of sound in the direction of the melt flow to the speed of sound in the direction perpendicular to the melt flow is between 3:1 and 9:1.

4. The composite according to claim 1 , wherein at least 80% of the fiber components comprise an averaged deviation angle less than 40 degrees at a direction of a melt flow of the composite.

5. The composite according to claim 1 , wherein the fiber components comprise a longitudinal dimension, a horizontal dimension and a vertical dimension, and wherein at least 60% of the fiber components have a shape ratio of the longitudinal dimension to the vertical dimension of at least 4 to 1; or at least 10:1.

6. The composite according to claim 1 , wherein the fiber components comprise polymer structures of cellulose material.

7. The composite according to claim 1 , wherein a surface zone of the composite extends from a longitudinal surface of the composite perpendicularly towards the interior of the composite; and the surface zone comprises thickness of at least 10% of the thickness of the composite, when the thickness of the composite is less than 500 microns; or the surface zone comprises thickness of up to 200 microns.

8. The composite according to claim 1 , wherein at least 80% of the fiber components in the vicinity of a surface of the composite are aligned along normal of the surface, such that rotation angle around longitudinal dimension of the fiber components is less than 40 degrees.

9. The composite according to claim 1 , wherein the organic natural fiber material comprises lignin under 15 percentage by weight; or under 5 percentage by weight; or under 1 percentage by weight; or under 0.5 percentage by weight.

10. A method for manufacturing a composite having a melt flow direction, the method comprising:
providing thermoplastic polymer matrix material and
providing fiber components with a hollow interior, wherein the fiber components are chemically treated particles of organic natural fiber material comprising cellulose from kraft process,
introducing a mixture comprising said thermoplastic polymer matrix material and said fiber components as a melt, and
forming a composite structure,

wherein at least part of the fiber components in the composite have been oriented substantially parallel with the direction of the melt flow, such that the speed of sound in a direction perpendicular to the melt flow is at least 10% less than in a direction of the melt flow.

11. The method according to claim 10 , wherein the speed of sound is below 1800 m/s in at least one direction in the composition.

12. The method according to claim 10 , wherein ratio of the speed of sound in the direction of the melt flow to the speed of sound in the direction perpendicular to the melt flow is between 3:1 and 9:1.

13. The method according to claim 10 , wherein at least 80% of the fiber components comprise an averaged deviation angle less than 40 degrees at a direction of a melt flow of the composite.

14. The method according to claim 10 , wherein the fiber components comprise a longitudinal dimension, a horizontal dimension and a vertical dimension, and wherein at least 60% of the fiber components have a shape ratio of the longitudinal dimension to the vertical dimension of at least 4 to 1; or at least 10:1.

15. The method according to claim 10 , wherein the fiber components comprise polymer structures of cellulose material.

16. The method according to claim 10 , wherein a surface zone of the composite extends from a longitudinal surface of the composite perpendicularly towards the interior of the composite; and the surface zone comprises thickness of at least 10% of the thickness of the composite, when the thickness of the composite is less than 500 microns; or the surface zone comprises thickness of up to 200 microns.

17. The method according to claim 10 , wherein at least 80% of the fiber components in the vicinity of a surface of the composite are aligned along normal of the surface, such that rotation angle around longitudinal dimension of the fiber components is less than 40 degrees.

18. The method according to claim 10 , wherein the organic natural fiber material comprises lignin under 15 percentage by weight; or under 5 percentage by weight; or under 1 percentage by weight; or under 0.5 percentage by weight.

19. A loudspeaker comprising the composite according to claim 1 .

20. A musical instrument comprising the composite according to claim 1 .

Assignees

• Upm Kymmene Corp

Inventors

• Kosonen Harri
• Turunen Sami
• Salminen Jere
• Myllytie Petri
• Luukko Kari
• Fors Stefan

Classifications

• C08J2401/02

  Cellulose; Modified cellulose · CPC title

• B29C35/0288

  Controlling heating or curing of polymers during moulding, e.g. by measuring temperatures or properties of the polymer and regulating the process (controlling or regulating chemical, physical or physico- chemical processes in general B01J19/0006) · CPC title

• C08J2301/02

  Cellulose; Modified cellulose · CPC title

• C08J2300/22

  Thermoplastic resins · CPC title

• C08L23/12

  Polypropene · CPC title