IES80583B2 - Improved elastic material - Google Patents
Improved elastic materialInfo
- Publication number
- IES80583B2 IES80583B2 IES980510A IES80583B2 IE S80583 B2 IES80583 B2 IE S80583B2 IE S980510 A IES980510 A IE S980510A IE S80583 B2 IES80583 B2 IE S80583B2
- Authority
- IE
- Ireland
- Prior art keywords
- elastic material
- stretch
- yam
- elastomeric
- narrow fabric
- Prior art date
Links
- 239000013013 elastic material Substances 0.000 title claims abstract description 31
- 239000004744 fabric Substances 0.000 claims abstract description 20
- 229920001707 polybutylene terephthalate Polymers 0.000 claims abstract description 8
- 238000009940 knitting Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims abstract description 3
- -1 polybutylene terephthalate Polymers 0.000 claims abstract description 3
- 230000008569 process Effects 0.000 claims abstract description 3
- 238000009941 weaving Methods 0.000 claims abstract description 3
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 description 3
- 229920002334 Spandex Polymers 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004759 spandex Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Landscapes
- Woven Fabrics (AREA)
Abstract
A narrow fabric elastic material comprises elastomeric elements (30) which are covered with a stretch yarn (40) of polybutylene terephthalate. The stretch yarn (40) may be applied in a knitting or weaving process and allows a significant increased grip of the elastomeric during the covering of the elastomeric elements. The stretch warp yarn allows a significant increased number of picks or courses to be inserted per cm whilst retaining the stretch characteristics of the elastic material resulting in more compact wefts which in turn gives reduced shrinkage properties for the fabric. It also allows for a significant increase in modulus.
Description
IMPROVED ELASTIC MATERIAL
The present invention relates to elastic material, in particular to an improved elastic ยป material with reduced run back characteristics, that is in which there is little or no run back or slippage of the elastic elements of a narrow fabric elastic material.
Run back is a phenomenon which occurs in narrow fabric elastic material in which the elastomeric or Lycra (Trade Mark) elastic elements disengage from other warp and weft elements, and thereby contract in length reducing the overall elasticity of the narrow fabric elastic material. Run back whilst still evident is generally less of a problem with rubber based narrow fabric elastomeric materials. It manifests itself mainly with Lycra and with other synthetic elastomers.
The present invention provides a narrow fabric elastic material comprising elastomeric elastic elements, in which the elastomeric elements are covered with a stretch warp yam.
Advantageously, the stretch yam is or includes polybutylene terephthalate (PBT).
Preferably, the stretch warp yam allows under full tension and feed control a significant increased grip of the elastomeric during the covering of the elastomeric elements of the elastic material, whilst retaining the stretch characteristics of the elastic material. The stretch yam may be applied in a knitting or weaving process for the manufacture of narrow fabric elastic material.
A run back test method can measure resistance of the elastomeric element in a narrow fabric elastic material by exposing one elastic element and clamping it in a extension testing device. The other end of the narrow fabric elastic material is clamped in a separate * lower jaw having cut the same elastic element which is exposed and clamped in the upper jaws above the lower jaw. A load is applied until the single elastic element is totally extracted from the piece of elastic material. Tests on embodiments of elastic material in
S 8 0 5 8 3
-2accordance with the invention on an extension testing device have demonstrated a very significant improvement in run back.
Preferably, the stretch warp yam also allows a significant increase in modulus due to the strength of the stretch yam characteristics when wrapped around the existing elastomeric element. This can be advantageous if extra strength is required or a similar strength can be obtained with a coarser needle gauge machine thus reducing manufacturing costs. Further benefits of this additional strength is that it can be used to create a variable modulus across the width of the fabric in conjunction with multiple needle spacing which provides extra comfort in elasticated shaped garment waistbands.
The invention will hereinafter be more particularly described with reference to the accompanying drawings, which show, by way of example only, one embodiment of elastic material according to the invention and an apparatus for manufacturing the elastic material.
In the drawings:
Figure 1 is an enlarged view showing the construction of the embodiment of elastic material; and
Figure 2 is a perspective view of a portion of a knitting apparatus used to manufacture the elastic material.
Referring to Figure 1, the narrow fabric elastic material 10 comprises a weft 20, and an elastomeric warp yam 30 covered by a PBT yam 40. The PBT yam 40 is formed in chain links 60 with the weft 20 being laid within the loops. For the purposes of illustration, the elastomeric yam 30 is shown in a staggered fashion, whereas in reality, the elastomeric yam 30 will be substantially straight, as it is the strongest yam.
Referring to Figure 2, the chain links 60 of PBT warp yam are formed by the warp placing rail 45 forming loops on the shank 75 of the bearded needles 70 with the weft yam 20
-3being laid within the loops. The needles 70 have a deeper shank 75 than normal. The needle therefore forms a bigger loop, allowing a significant increased number of picks or courses to be inserted per cm resulting in more compact wefts, whilst retaining the stretch characteristics of the elastic material which in turn gives reduced shrinkage properties for the fabric.
It will of course be understood that the invention is not limited to the specific details described herein, which are given by way of example only, and that various modifications and alterations are possible within the scope of the invention as defined in the appended claims.
Claims (5)
1. A narrow fabric elastic material comprising elastomeric elastic elements, in which the elastomeric elements are covered with a stretch warp yam.
2. A narrow fabric elastic material as claimed in Claim 1, in which the stretch yam is or includes polybutylene terephthalate (PBT).
3. A narrow fabric elastic material as claimed in Claim 1 or Claim 2, in which the io stretch warp yam allows under full tension and feed control a significant increased grip of the elastomeric during the covering of the elastomeric elements of the elastic material, whilst retaining the stretch characteristics of the elastic material, with the stretch yam being applied in a knitting or weaving process for the manufacture of narrow fabric elastic material.
4. A narrow fabric elastic material as claimed in any one of the preceding claims, in which the stretch warp yam also allows a significant increased number of picks or courses to be inserted per cm, whilst retaining the stretch characteristics of the elastic material resulting in more compact wefts which in turn gives reduced shrinkage properties for the 20 fabric.
5. A narrow fabric elastic material as claimed in any one of the preceding claims, in which the stretch warp yam allows for a significant increase in modulus due to the strength of the stretch yam characteristics when wrapped around the existing elastomeric element.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IES980510 IES80583B2 (en) | 1998-03-26 | 1998-06-24 | Improved elastic material |
| EP99650029A EP0945535A3 (en) | 1998-03-26 | 1999-03-26 | Improved elastic material and curved garment elements and method and apparatus for their manufacture |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IE980227 | 1998-03-26 | ||
| IES980510 IES80583B2 (en) | 1998-03-26 | 1998-06-24 | Improved elastic material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IES980510A2 IES980510A2 (en) | 1998-10-07 |
| IES80583B2 true IES80583B2 (en) | 1998-10-07 |
Family
ID=26320170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IES980510 IES80583B2 (en) | 1998-03-26 | 1998-06-24 | Improved elastic material |
Country Status (1)
| Country | Link |
|---|---|
| IE (1) | IES80583B2 (en) |
-
1998
- 1998-06-24 IE IES980510 patent/IES80583B2/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| IES980510A2 (en) | 1998-10-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FK9A | Application deemed to have been withdrawn section 23(9) | ||
| MM4A | Patent lapsed |