Mechanically compacted fabrics for orthopedic casting tapes

• US 5,449,550 A
• Filed: 09/01/1994
• Issued: 09/12/1995
• Est. Priority Date: 01/25/1993
• Status: Expired due to Fees

• Current Assignee: 3M Company
• Original Assignee: 3M Company
• Inventors: Neamy, Scott A., Scholz, Matthew T., Yasis, Rafael M.
• Primary Examiner(s): Bell, James J.
• Application Number:
  US08/299,570
• Time in Patent Office: 376 Days
• Field of Search: 428/254, 428/268, 428/273, 428/285, 428/253, 428/910, 428/225, 602/8
• US Class Current: 442/180
• CPC Class Codes: A61L 15/07 Stiffening bandages
• CPC Class Codes: Y10S 428/91 Product with molecular orientation
• CPC Class Codes: Y10T 442/2992 Coated or impregnated glass fiber fabric
• CPC Class Codes: Y10T 442/419 Including strand precoated with other than free metal or alloy

Abstract

The present invention provides an article, comprising: a fabric sheet which has been mechanically compacted; and a curable item coated onto the fabric sheet. The present invention involves compacting a fabric sheet to impart stretchability and conformability to the fabric while minimizing undesirable recovery forces. Suitable fabrics for mechanical compacting are fabrics which comprise fiberglass fibers which are capable of first being mechanically compacted and then being set or annealed in the distorted, state. The article may be in the form of an orthopedic bandage and may optionally contain a microfiber filler associated with the resin.

Claims

1. An article, comprising:

a mechanically compacted fiberglass fabric sheet, wherein said fabric comprises adjacent rows of overlapping loops, said loops being mechanically compacted to a non-contacting position and said fabric sheet then being heat set; and

a curable liquid resin coated onto said fabric sheet.

2. An article, as defined in claim 1, further comprising:

a microfiber filler associated with said resin, wherein said microfiber filler has an aspect ratio between about 5;

1 and 200;

1.

3. An article, as defined in claim 1, wherein said sheet has from about 25% to about 75% extensibility in the elongated direction when a 268 gram load or force is applied across a 1 cm section of the fabric.

4. An article, as defined in claim 2, wherein said sheet has from about 35% to about 65% extensibility in the elongated direction when a 268 gram load or force is applied across a 1 cm section of the fabric.

5. An article, as defined in claim 3, wherein said curable resin is a water-curable resin comprising isocyanate-functional prepolymers.

6. An article, as defined in claim 3, wherein said curable resin is a water-curable resin comprising a water-reactive liquid organometallic compound and an organic polymer.

7. An article, as defined in claim 4, wherein said fabric has between about 6 and 70 openings per square cm.

8. An article, as defined in claim 1, wherein said fabric was compacted to between about 10 and 65 percent of its original dimension.

9. An article, as defined in claim 1, wherein said fabric was compacted to between about 20 and 50 percent of its original dimension.

10. An article, according to claim 9, wherein said resin has a viscosity between about 10 Pa s and 100 Pa s.

11. An article, as defined in claim 1, wherein said article is selected from the group consisting of orthopedic casts, orthopedic splints, braces, supports, protective shields, and orthotics.

12. An article, as defined in claim 1, wherein said article is in the form of an orthopedic casting bandage.

13. An orthopedic casting bandage, as defined in claim 12, wherein said fiberglass sheet further comprises a starch sizing.

14. An orthopedic casting bandage, as defined in claim 12, wherein said casting bandage further comprises:

between 3 and 35 percent of a microfiber filler associated with said resin, wherein said microfiber filler has an aspect ratio between about 5;

1 and 200;

1.

15. An orthopedic casting bandage, as defined in claim 12, wherein said fabric has between about 6 and 70 openings per square cm.

16. An orthopedic casting bandage, as defined in claim 12, wherein said fabric was compacted to between about 10 and 65 percent of its original dimension.

17. An orthopedic casting bandage, as defined in claim 12, wherein said fabric was compacted to between about 20 and 50 percent of its original dimension.

18. An orthopedic casting bandage, as defined in claim 12, wherein said sheet has from about 35% to about 65% extensibility in the elongated direction when a 268 gram load or force is applied across a 1 cm section of the fabric.

19. An orthopedic casting bandage, as defined in claim 12, wherein said resin has a viscosity between about 10 Pa s and 100 Pa s.