Stock material or miscellaneous articles – Structurally defined web or sheet – Including stitching and discrete fastener – coating or bond
Patent
1984-12-26
1986-09-09
McCamish, Marion C.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including stitching and discrete fastener, coating or bond
428 62, 428191, 428200, 428247, 428294, 428346, 428464, H05B 316
Patent
active
046109064
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to improvements in carpet seaming tapes and relates particularly to an improved form of tape particularly useful for joining edge portions of carpet or similar material and for removing joining tape from previously seamed material.
BACKGROUND ART
Various forms of carpet joining tape are well known. One form of tape comprises a strip of metal foil with a ribbon or layer of heat softenable adhesive thereon and preferably also including a reinforcing material such as woven textile material or the like. The adhesive is softened by the application of heat and an adhesive bond is thereby formed between the tape and the underside of a carpet material to which the tape is applied.
Another form of carpet joining tape is known in which a strip of Kraft paper or similar material is used as a backing, the paper, metal foil and reinforcing material being secured together either by the heat softenable adhesive or by other means such as sewing.
In the use of such carpet joining tapes, it is known to pass an electric current along the metal foil to generate heat therein which melts the adhesive to enable the tape to be adhered to the carpet backing of the carpet pieces to be joined. However, a relatively high current is required to be passed through the foil to generate sufficient heat to melt the adhesive, and when the seam to be made is relatively long thus requiring a relatively long length of tape, it is necessary to utilize at least one relatively long lead to enable the current source to be connected to both ends of the metal foil strip.
It is therefore desirable to provide an improved carpet joining tape which avoids or at least minimizes difficulties associated with the known carpet joining tapes.
It has been proposed to provide a "split foil" tape as described in Australian Patent Application No. 57288/80 wherein the metal foil strip running the length of the tape is longitudinally divided into two or more separated strips extending along the length of the tape. With such an arrangement, it is proposed that a bridging connection is made ar one end of the tape and the electrical connections are provided at the other end of the tape thus obviationg the need for relatively long current leads. However, with such a construction of tape, the metal foil required to carry the necessary current to provide sufficient heating to melt the adhesive is relatively thick and, therefore, relatively expensive. Further, difficulties have arisen in producing such a tape and in ensuring that the two foil strips which are separated from each other across the width of the tape remain so separated and do not short together midway along the length of the tape and are not bridged by any material which may provide an alternative current path.
SUMMARY OF THE INVENTION
The present invention provides an improved construction of carpet joining tape in which the difficulties associated with the "split foil" tape are removed.
According to the invention there is provided a carpet joining tape comprising first and second strips of metal foil overlying each other and separated by an electrical insulating material, said strrps and insulating material being secured together and each strip having a cross-sectional area which enables an electrical current to pass therethrough to generate heat therein whereby the combined heat from both foil strips is sufficient to melt a carpet joining heat softenable adhesive composition.
In one preferred form of the invention, the metal foil strips are secured to a base strip of an insulating material, such as crepe Kraft paper, which acts as a heat insulator to thereby minimize heat loss from the lower foil strip when the tape is in use.
The improved tape of the invention may be used solely as a heating element which may be placed beneath a previously formed seam comprising a carpet joining tape adhered in position under the abutting carpet edges forming the seam to thereby remelt the adhesive on that carpet tape to allow adjustment of the seam or removal of
REFERENCES:
patent: 4483896 (1984-11-01), Gray et al.
Brooks Electrofoil Seaming Systems Pty. Ltd.
McCamish Marion C.
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