Plastic and nonmetallic article shaping or treating: processes – Forming electrical articles by shaping electroconductive... – Conductive carbon containing
Patent
1995-08-28
1997-08-26
Theisen, Mary Lynn
Plastic and nonmetallic article shaping or treating: processes
Forming electrical articles by shaping electroconductive...
Conductive carbon containing
264104, 264115, 264345, 264DIG69, B29C 3502, B29C 6724
Patent
active
056607750
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of treating waste magnetic tapes and to a method of manufacturing building material boards using the treated material obtained thereby.
BACKGROUND ART
Although a huge amount of waste magnetic tapes of those such as video tapes and cassette tapes has been disposed of every year, heretofore, a method of recycling properly such waste tapes has not been found.
DISCLUSIVE OF THE INVENTION
The present invention proposes a method of treating the above-mentioned waste magnetic tapes and a method of manufacturing building material boards from the treated material.
SUMMARY OF THE INVENTION
The subject matter of the present invention is both a method of treating waste magnetic tapes characterized in that waste magnetic tapes of those such as video tapes and cassette tapes are cut or crushed to a length of 1 to 50 mm, preferably 3 to 10 mm, and heated at a temperature of 100.degree. to 200.degree. C., preferably 140.degree. to 170.degree. C. so that they are contracted in the form of curl, and a method of manufacturing building material boards characterized in that waste magnetic tapes of those such as video tapes and cassette tapes are cut or crushed to a proper size, heated, and then, supplied with a binder and molded under pressure.
In the above-mentioned method of manufacturing building material boards, waste magnetic tapes are cut or crushed to a length of 1 to 50 mm, preferably 3 to 10 mm. Where waste magnetic tapes are crushed to less than 1 mm, the cost of crushing is too expensive, and resulting products become powdery, so that a structure holding voids therein is not obtained. For more than 50 mm, the surface state of the products after being molded becomes rough and a lower strength is obtained, thereby providing no practicability.
The heating treatment is performed at a temperature of 100.degree. to 200.degree. C., preferably 140.degree. to 170.degree. C. At a temperature less than 100.degree. C., the form of curl is not obtained. At a temperature more than 200.degree. C., the products are deteriorated due to air oxidation and thus cannot be used.
As the above-mentioned binder, a material capable of being cured and molded at room temperature or by heating can be used such as latex, liquid rubber, polyethane adhesive, epoxy resin, melamine resin, phenolic type resin and urea resin.
The binder is added to waste magnetic tapes with 3 to 70 parts, preferably 10 to 50 parts by weight of the former to one part of the latter, and then both are mixed uniformly.
In manufacturing the above-mentioned building material boards, ferrite, carbon black, graphite, carbon fiber or conductive metallic powder having electromagnetic wave properties can be added to waste magnetic tapes, or conductive metallic fiber or conductive metallic wire mesh having a 12 to 100 mesh size can be mixed therein, for example, in a sandwich construction.
The above-mentioned ferrite includes spinel based one, garnet based one and magnet prumbite based one, which are individually or mixedly added to waste magnetic tapes with 100 to 150 parts, preferably 30 to 70 parts by weight of the former to one part of the latter.
As the above-mentioned carbon black, there can be used channel black, furnace black, acetylene black, thermal black, lamp black and the like, one of which is added to waste magnetic tapes with 1 to 100 parts, preferably 10 to 30 parts by weight of the former to one part of the latter.
As the above-mentioned conductive metallic powder, iron, stainless, copper, aluminum and the like can be individually used or mixed with carbon black, which are added to waste magnetic tapes with 10 to 150 parts, preferably 30 to 70 parts by weight of the former to one part of the latter.
As the above-mentioned conductive metallic fiber or conductive wire mesh, there can be used fiber of iron, stainless, copper, aluminum and the like, or wire mesh knitted from these fiber and having a 12 to 100 mesh size, which are mixed into waste magnetic tapes with 1 to 100 parts, preferably 10 to 3
Kasahara Kanesuke
Nagai Shunsai
Takanishi Kohei
Fuji Kasei Kogyo Co. Ltd.
Theisen Mary Lynn
LandOfFree
Method of treating waste magnetic tapes and method of manufactur does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of treating waste magnetic tapes and method of manufactur, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of treating waste magnetic tapes and method of manufactur will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1985975