Classifying – separating – and assorting solids – Precedent preparation of items or materials to facilitate... – Selective differentiation
Patent
1977-05-16
1979-11-27
Halper, Robert
Classifying, separating, and assorting solids
Precedent preparation of items or materials to facilitate...
Selective differentiation
209 47, 209215, B03C 100
Patent
active
041760549
ABSTRACT:
A method of waste paper recycling wherein the unwanted portions of waste paper such as those containing a binder adhesive are separated from the remaining paper material. In the binding of books, catalogues, directories, pamphlets, magazines and the like, adhesive material is provided having a magnetic substance therein and in subsequent recycling, the waste paper from these books and magazines is cut into a plurality of relatively small pieces. These pieces are passed through a magnetic field wherein the portions containing the adhesive having magnetic material therein, are separated from the remaining non-magnetically attracted sheets of paper. The process can be carried out wet or dry and the invention also includes a new type adhesive for use in book, magazine, catalogue and pamphlet binding processes wherein a proportion of magnetic or paramagnetic material is integrated with the adhesive material (preferably of the hot melt type commonly used in binding books) so that upon subsequent recycling of the books, etc. as waste paper, the adhesive containing portions of the paper may be magnetically separated from the rest of the waste paper sheets.
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