Patent Application
20070218234
The present invention is related to an improved tape-type magnet having at least one adhesive face for adhering to a surface of a predetermined article. By means of the magnetic attraction of the tape-type magnet, the article can attract and attach to a magnetic article.
Taiwanese Patent No. M253047 discloses a magnetic tape structure formed of a very thin tape-shaped soft magnetic substrate. A layer of releasable agent is laid on one face of the substrate, while an adhesive layer is laid on the other face of the substrate. The substrate is wound into a roll. One end of the roll of substrate can be unwound and torn off into a segment. The segment can be attached to a back face of an article. Then the article can attract a magnetic wall face or board face by means of magnetic attraction. The magnetic tape itself is made from microgranule of ferric oxide. In use, such microgranule tends to detach from the surface of the substrate. In addition, such microgranule makes it difficult to spray the releasable agent on the face of the substrate. This directly affects the manufacturing cost and practicability of the magnetic tape.
Taiwanese Patent Application No. 94108103 of this applicant discloses an improved magnetic tape structure and a manufacturing method thereof. High-performance releasable agent and property-changing agent are directly added into the soft magnetic material and evenly blended therewith. Then the mixture is molded into a tape the entire surface of which has releasable effect. Then one face of the tape is purified or roughened. Then an adhesive is overlaid on the treated face of the tape. Accordingly, the surface of the tape is not apt to peel off and the adhesion of the tape is enhanced. In addition, it is no more necessary to further spray any releasable agent onto the surface of the tape. Therefore, the working time and labor can be saved and a reliable and uniform releasable effect of the entire tape can be ensured. However, the complicated components of the tape also increases the manufacturing cost and the magnetism of the tape may be affected. In addition, before produced, the tape must go through some development and test procedures. These procedures necessitate considerable cost. In comparison with the conventional magnetic tape, the improved magnetic tape is not advantageous in economic efficiency.
It is therefore a primary object of the present invention to provide an improved tape-type magnet. The conventional tape-type magnet is made from microgranule of ferric oxide. The microgranule tends to detach from the surface of the conventional tape-type magnet. In addition, such microgranule makes it difficult to spray the releasable agent on the face of the conventional tape-type magnet. The improved tape-type magnet of the present invention has no such problems and the quality of the improved tape-type magnet of the present invention is ensured.
It is a further object of the present invention to provide the above improved tape-type magnet which has simplified components and stable quality. The cost for development of the improved tape-type magnet of the present invention is lowered.
According to the above objects, the tape-type magnet of the present invention includes a soft magnetic substrate which is a thin strip or tape with magnetic attraction. A first adhesive layer is uniformly laid on one face of the magnetic substrate. A releasable facial layer is bonded with the other face of the magnetic substrate via a second adhesive layer. The adhesion between the releasable facial layer and the second adhesive layer is greater than an adhesion between the releasable facial layer and the first adhesive layer, whereby the releasable facial layer is releasable from the first adhesive layer. The magnetic substrate is wound into a roll with the second adhesive layer serving as an outer face and the first adhesive serving as an outer face and the first adhesive layer serving as an inner face. An outermost end of the magnetic substrate can be easily unwound and torn off into a segment.
The present invention can be best understood through the following description and accompanying drawings wherein:
Please refer to FIGS. 1 to 3. According to a first embodiment the tape-type magnet of the present invention includes a very soft magnetic substrate 1, a first adhesive layer 2, a releasable facial layer 3 and a second adhesive layer 4. The magnetic substrate 1 is soft strip or tape body with magnetic attraction. The first adhesive layer 2 is uniformly laid on one face of the magnetic substrate 1, while the second adhesive layer 4 is uniformly laid on the other face of the magnetic substrate 1. The releasable facial layer 3 is bonded with the magnetic substrate 1 via the second adhesive layer 4. The adhesion between the releasable facial layer 3 and the magnetic substrate 1 is greater than the adhesion between the releasable facial layer 3 and the first adhesive layer 2. Accordingly, the releasable facial layer 3 is releasable from the first adhesive layer 2. The magnetic substrate 1 is wound with the second adhesive layer 4 serving as an outer face and the first adhesive layer 2 serving as an inner face. In use, an outermost end of the magnetic substrate 1 is unwound and torn off into a segment. In addition, the outer surface of the releasable facial layer 3 can be printed with characters, figures or marks 31 as necessary. Moreover, a layer of releasable material 32 can be further sprayed on (or overlaid on or attached to) the outer face of the releasable facial layer 3.
The magnetic substrate 1 is made from a mixture of plastic or rubber material and a magnetizable material and formed as a thin sheet. Then, the thin sheet is magnetized. In production procedure, the first and second adhesive layers 2, 4 are respectively laid on two faces of the thin sheet. In addition, a releasable facial layer 3 is strongly bonded with the second adhesive layer 4. Then the thin sheet is cut into strips which are wound into rolls by an automatic machine. In the winding procedure, the first adhesive layer 2 faces inward, while the releasable facial layer 3 faces outward.
The magnetic substrate 1 of the present invention pertains to prior art and has more stable quality. In contrast, Taiwanese Patent Application No. 94108103 discloses a magnetic tape structure in which releasable agent and property-changing agent are directly added into the soft magnetic material. This will affect the intensity of the magnetism and durability of the product. In addition, the complicated components of the tape lead to increment of cost for the material. Such magnetic tape is not advantageous in economic efficiency.
In use, the releasable facial layer 3 is releasable from the first adhesive layer 2. Therefore, the outermost end of the wound magnetic substrate 1 can be easily unwound and pulled out and cut off into a segment with a certain length. Then the first adhesive layer 2 can be adhered to an article or a plane face. By means of the magnetic attraction of the magnetic substrate 1 through the releasable facial layer 3, the article can mobilely attract and attach to a magnetic or magnetizable article or plane face.
The above embodiments are only used to illustrate the present invention, not intended to limit the scope thereof. Many modifications of the above embodiments can be made without departing from the spirit of the present invention.
