Polyurethane vibratory screen

Patent metadata

Field	Value
Publication number	US-9375756-B2
Application number	US-201514663030-A
Country	US
Kind code	B2
Filing date	Mar 19, 2015
Priority date	Apr 19, 2010
Publication date	Jun 28, 2016
Grant date	Jun 28, 2016

Abstract

A molded polyurethane vibratory screen including a body having opposite side edge portions, upper and lower edge portions, an upper surface and a lower surface, first members extending between the side edge portions and the second members extending between the lower edge portion and the upper edge portion, third members substantially parallel and extending transversely between the side edge portions and having multiple first members therebetween, the fourth members substantially parallel and extending transversely between the lower edge portion and the upper edge portion and having multiple second members therebetween, reinforcement members molded integrally with the third and fourth members.

First claim

What is claimed is:

1. A vibratory screen comprising: a flexible molded polyurethane body having substantially parallel side edge portions at opposite ends of the body, a lower edge portion transversely disposed between the side edge portions, an upper edge portion disposed between the side edge portions and substantially parallel and opposite to the lower end portion, an upper surface, a lower surface, a first integrally molded grid structure, a second integrally molded grid structure, a third integrally molded grid structure and screen openings, wherein the first grid structure includes first and second members forming the screening openings, the first members substantially parallel and extending transversely between the side edge portions and the second members substantially parallel and extending transversely between the lower edge portion and the upper edge portion, wherein the second grid structure includes third and fourth members, the third members substantially parallel and extending transversely between the side edge portions and having multiple first members therebetween, the fourth members substantially parallel and extending transversely between the lower edge portion and the upper edge portion and having multiple second members therebetween, wherein the third grid structure includes fifth and sixth members, the fifth members substantially parallel and extending transversely between the side edge portions and having multiple third members therebetween, the sixth members substantially parallel and extending transversely between the lower edge portion and the upper edge portion and having multiple fourth members therebetween, wherein reinforcement members are molded integrally with at least one of the first, third, and fifth members and at least one of the second, fourth, and sixth members.

2. The vibratory screen of claim 1 , wherein the first members include reinforcement members molded integrally therewith, the reinforcement members having a thickness in the range of about 0.006 inches to about 0.015 inches.

3. The vibratory screen of claim 1 , wherein the second members include reinforcement members molded integrally therewith, the reinforcement members having a thickness in the range of about 0.006 inches to about 0.015 inches.

4. The vibratory screen of claim 1 , wherein the openings are about 0.044 mm to about 4 mm between inner surfaces of the first members and about 0.044 mm to about 60 mm between inner surfaces of the second members.

5. The vibratory screen of claim 1 , wherein the reinforcement members are molded integrally with the first and second members.

6. The vibratory screen of claim 5 , wherein the first members include reinforcement members molded integrally therewith, the reinforcement members having a thickness in the range of about 0.006 inches to about 0.015 inches, and wherein the second members include reinforcement members molded integrally therewith, the reinforcement members having a thickness in the range of about 0.015 inches to about 0.040 inches.

7. The vibratory screen of claim 5 , wherein the reinforcement members are at least one of an aramid fiber and naturally occurring fiber.

8. The vibratory screen of claim 5 , wherein the reinforcement members are aramid fibers that are at least one of a twisted multistrand and a woven multistrand and wherein the polyurethane impregnates the multistrand forming a bond between the first member and the fiber therein and a bond between the second member and the fiber therein.

9. The vibratory screen of claim 5 , wherein reinforcement rods are molded integrally with at least one of the fourth and sixth members.

10. The vibratory screen of claim 9 , wherein the reinforcement rods are at least one of a plastic, a metal and a polymer.

11. The vibratory screen of claim 1 , wherein the reinforcement members are molded integrally with the third and fourth members.

12. The vibratory screen of claim 1 , wherein the reinforcement members are aramid fibers that are at least one of a twisted and a woven multistrand, wherein the fibers are about 55 denier to about 2840 denier.

13. The vibratory screen of claim 11 , wherein reinforcement rods are molded integrally with at least one of the fourth and sixth members.

14. The vibratory screen of claim 1 , wherein the reinforcement members are molded integrally with the fifth and sixth members.

15. The vibratory screen of claim 14 , wherein the reinforcement members are least one of an aramid fiber and naturally occurring fiber.

16. The vibratory screen of claim 14 , wherein reinforcement rods are molded integrally with at least one of the fourth and sixth members.

17. The vibratory screen of claim 16 , wherein the reinforcement rods are at least one of a plastic, a metal and a polymer.

18. The vibratory screen of claim 1 , wherein the screen has an open screening area greater than forty percent.

19. The vibratory screen of claim 1 , wherein the side edge portions are configured to be tensioned on at least one of a vibratory screening machine and an attrition screening device.

20. A method of making a vibratory screen, comprising:
creating a mold configured to fabricate the vibratory screen, the vibratory screen having a flexible molded polyurethane body;
installing reinforcement members in the mold, the reinforcement members configured to be molded integrally with the body;
installing reinforcement rods in the mold, the reinforcement rods configured to be molded integrally with the body
filling the mold with polyurethane; and
forming the vibratory screen, the vibratory screen having substantially parallel side edge portions at opposite ends of the body, a lower edge portion substantially perpendicular to the side edge portions, an upper edge portion substantially perpendicular to the side edge portions and opposite the lower edge portion, an upper surface, a lower surface, first and second members forming screening openings, the first members extending between the side edge portions and the second members extending between the lower edge portion and the upper edge portion, third members substantially parallel and having multiple first members therebetween, fourth members substantially parallel and having multiple second members therebetween.

21. The method of claim 20 , wherein the first members include reinforcement members molded integrally therewith, the reinforcement members having a thickness in the range of about 0.006 inches to about 0.015 inches.

22. The method of claim 20 , wherein the second members include reinforcement members molded integrally therewith, the reinforcement members having a thickness in the range of about 0.015 inches to about 0.040 inches.

23. The method of claim 20 , wherein the openings are about 0.044 mm to about 4 mm between inner surfaces of the first members and about 0.044 mm to about 60 mm between inner surfaces of the second members.

24. The method of claim 20 , wherein the reinforcement members are molded integrally with the first and second members.

25. The method of claim 24 , wherein the first members include reinforcement members molded integrally therewith, the reinforcement members having a thickness in the range of about 0.006 inches to about 0.015 inches, and wherein the second members include reinforcement members molded integrally therewith, the reinforcement members having a thickness in the range of about 0.015 inches to about 0.040 inches.

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Assignees

• Derrick Corp

Inventors

• Lipa Anthony J
• Colgrove James R

Classifications

• B29L2031/14

  Filters {(optical filters B29L2011/0066, sieves or screens B29L2031/737)} · CPC title

• B29K2075/00

  Use of {PU, i.e.} polyureas or polyurethanes {or derivatives thereof}, as moulding material · CPC title

• B29K2277/10

  Aromatic polyamides [Polyaramides] or derivatives thereof · CPC title

• B07B1/4618

  Manufacturing of screening surfaces · CPC title

• B07B1/4609 Primary

  constructional details of screening surfaces or meshes · CPC title