HEAT RESISTANT SEPARATION FABRIC

Abstract

The heat resistant separation fabric for use as tool cover in glass processing comprises heat resistant yarns (100). The heat resistant yarns comprise a core (110) and at least one wrap yarn (123, 125). The core is a core yarn. The core yarn is a multifilament glass yarn. The at least one wrap yarns (123, 125) comprises stainless steel fibers. The core yarn is present in the heat resistant yarn without crimp. The at least one wrap yarn is wrapped around the core yarn.

Claims

1. Heat resistant separation fabric for use as tool cover in glass processing; wherein the heat resistant separation fabric comprises heat resistant yarns; wherein the heat resistant yarns comprise a core; wherein the core is a core yarn, wherein the core yarn is a multifilament glass yarn; wherein the core yarn is present in the heat resistant yarn without crimp; and at least one wrap yarn, wherein the at least one wrap yarn comprises stainless steel fibers; and wherein the at least one wrap yarn is wrapped around the core yarn.

2. Heat resistant separation fabric as in claim 1, wherein the heat resistant yarn comprises a first set of at least one wrap yarn, wherein the wrap yarn or wrap yarns of the first set of at least one wrap yarn are wrapped in Z-direction around the core yarn; and wherein the heat resistant yarn comprises a second set of at least one wrap yarn, wherein the wrap yarn or wrap yarns of the second set of at least one wrap yarn are wrapped in S-direction around the core yarn.

3. Heat resistant separation fabric as in claim 2, wherein the wrap yarn or warp yarns of the first set of at least one wrap yarn; and the wrap yarn or wrap yarns of the second set of at least one wrap yarn are wrapped around the core yarn with the same number of turns per meter length of the heat resistant yarn.

4. Heat resistant fabric as in claim 1, wherein the heat resistant fabric is a woven fabric.

5. Heat resistant fabric as in claim 1, wherein the heat resistant fabric is a knitted fabric.

6. Heat resistant fabric as in claim 1, wherein the wrap yarn is a twisted yarn, comprising or consisting out of fibers of discrete length.

7. Heat resistant fabric as in claim 1, wherein the wrap yarn is a plied yarn.

8. Method of processing a glass product; wherein a tool is provided to process a glass product; wherein the tool is covered by a heat resistant separation fabric; wherein the heat resistant separation fabric comprises heat resistant yarns; wherein the heat resistant yarns comprise a core; wherein the core is a core yarn, wherein the core yarn is a multifilament glass yarn; wherein the core yarn is present in the heat resistant yarn without crimp; and at least one wrap yarn, wherein the at least one wrap yarn comprises stainless steel fibers; and wherein the at least one wrap yarn is wrapped around the core yarn; wherein the heat resistant separation fabric is provided to separate the tool from the glass product being processed such that the glass product does not contact the tool directly.

9. Method as in claim 8, wherein the glass product is mirror glass.

10. Method as in claim 8, wherein the glass product is automotive glass.

Description

BRIEF DESCRIPTION OF FIGURES IN THE DRAWINGS

[0039] FIG. 1 shows an example of a heat resistant yarn that can be used in the invention.

MODE(S) FOR CARRYING OUT THE INVENTION

[0040] FIG. 1 shows an example of a heat resistant yarn 100 that can be used as core yarn in fabrics according to the invention. The heat resistant yarn comprises a core 110. The core is a core yarn. The core yarn is a multifilament glass yarn. The core yarn is present in the heat resistant yarn without crimp. The heat resistant yarn comprises a first set of wrap yarns 123, wrapped in Z-direction around the core yarn. The heat resistant yarn comprises a second set of wrap yarns 125, wrapped in S-direction around the core yarn. The yarns of the first set of wrap yarns 123 and the yarns of the second set of wrap yarns 125 are wrapped around the core yarn with the same number of turns per meter. The wrap yarns comprise stainless steel fibers.

[0041] A first example of the invention is a woven fabric (fabric A) according to the second aspect of the invention. The fabric consists out of the same heat resistant yarns in weft and in warp direction of the woven fabric. The heat resistant yarn has a two-ply 33*2 tex (150 turns per meter ply twist in S-direction) multifilament glass (S-glass) yarn as core yarn. The core yarn is present in the heat resistant yarn without crimp. The core yarn is wrapped with two stainless steel fiber yarns. The wrapping twist of each of the two stainless steel fiber wrap yarns is 250 turns per meter. One of the stainless steel fiber yarns is wrapped in Z-direction; the other stainless steel fiber yarn is wrapped in 5-direction. The stainless steel fiber wrap yarns are 1 Nm (=90*2 tex) spun and ply twisted stainless steel fibers yarns, consisting out of stretch broken stainless steel fibers of equivalent diameter 12 m, out of alloy AISI 316L. The woven fabric has a weft density 18 weft yarns per centimetre and a warp density 18 warp yarns per centimetre. The weave was a satin 5 weave. The fabric has a specific weight of 700 g/m.sup.2 and is 1 mm thick.

[0042] The inventive fabric (woven fabric A) has been compared as tool cover in mirror glass production with two other fabrics, woven fabrics B and C, similar in weave and construction as fabric A. Fabric B had 100% two-ply stainless steel fiber yarn in warp direction and ply-twisted fiberglass/ stainless steel fiber yarn in weft direction. Fabric C had ply-twisted fiberglass/stainless steel fiber yarn in warp and in weft direction. With ply-twisted fiberglass/stainless steel fiber yarn is meant that a fiberglass yarn and a stainless steel fiber yarn are twisted together. Whereas fabric A resulted in consistent high quality mirror glass processed on the different tools in parallel on the production line; fabrics B and C showed much worse quality results. Fabric B showed a large variation in mirror glass quality between mirror glass processed on the different tools in parallel on the production line. Fabric C showed overall lower quality of the produced mirror glass, and more variation in quality than fabric A.

[0043] It has also been observed that in terms of consistent quality in mirror glass production, woven fabrics provide significantly better results than knitted fabric. Probably, this is related with the more linear position of the yarns in a woven fabric compared to in a knitted fabric.