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Heat recoverable article
| Details |
Inventors: Jensen, Per J. T.; Park, George B.; Baigrie, Stephen M.; Gansbuehler, George M. J.; Penneck, Richard J.;
Assignee: Raychem Corporation (Menlo Park, CA)
Primary Examiner: Seidleck; James
Assistant Examiner:
Attorney, Agent or Firm: Richardson; Timothy, Burkard; Herbert
A tubular heat recoverable article comprises conductive polymeric material and is heated to effect recovery by the passage of electrical current therethrough. Elongate electrodes are attached on the surface or embedded in longitudinal flanges extending along the article. The flanges also comprise conductive polymeric material but are not heat recoverable, and therefore remain substantially undeformed on recovery other than bending to accommodate transitions. This means that the contact resistance between the electrode and the conductive material of the flange does not increase significantly on recovery. |
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DETAILED DESCRIPTION We claim: 1.
An article which (1) is heat recoverable, and (2) comprises (a) a heat recoverable element which is composed of a conductive polymer and (b) at least two support elements which (i) are not heat recoverable, and (ii) are spaced apart from each other, so that if an electrode is attached to each support element and connected to a suitable power source, current passes between the electrodes through the conductive polymer element and generates heat therein which thereby effects recovery of the article, with the proviso that, if the article is of open cross-section, at least one of the support elements is not part of a closure system for maintaining the article in a tubular configuration around a substrate.
2.
An article according to claim 1 which is tubular of open or closed cross-section.
3.
A tubular article according to claim 2, wherein the support elements are arranged such that, when electrodes attached thereto are powered, current flows around the circumference of the tube along at least two discrete current paths, at least one of the current paths being clockwise and at least one of the current paths being anti-clockwise, when the article is viewed axially from one end of the article.
4.
An article according to claim 3, wherein at least part of the tubular article in each of the current paths comprises a heat recoverable conductive polymer element.
5.
An article according to claim 2, wherein there are two support elements each of which comprises a longitudinal flange extending in the direction of the length of the tube, and the flanges define minor and major circumferential portions of the article.
6.
An article according to claim 2, wherein each of the support elements comprises a longitudinal flange extending in the direction of the length of the tube.
7.
An article according to claim 5, wherein the minor or major circumferential portion of the article is heat recoverable.
8.
An article according to claim 6, wherein there are two support elements diametrically opposed to each other
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Manufacturing Materials 
