Manufacturing container or tube from paper; or other manufacturi – Bending – Folding
Patent
1987-02-06
1988-08-30
Schmidt, Frederick R.
Manufacturing container or tube from paper; or other manufacturi
Bending
Folding
493454, 493463, 493941, B31B 100
Patent
active
047673940
ABSTRACT:
A method and apparatus for making axial-flow filters wherein a sectorial-shaped sheet of filter material having corrugations therein parallel to the curved ends thereof is made from a flat sheet of filter material, and thereafter the corrugated sheet is made into an annulus to obtain the final product. Initially, an edge portion of a flat sheet of filter material is attached to a sectorial-shaped mold, having a mold surface defined by curved ridges and valleys parallel to the curved ends of the mold, so that the sheet is slanted up away from the mold surface from the smaller curved end of the mold. Thereafter a set of curved forming blades is moved down toward the mold to engage the sheet and to fold it successively and consecutively across the ridges of the mold and beneath the edges of the blades into the valleys of the mold to corrugate the sheet. The corrugated sheet thus produced is made into an annulus by using a contouring belt which embraces the larger convexly curved ends of the sheet and constricts the sheet into an annulus. Thereafter the annular filter is reshaped by positioning a set of curved blades, corresponding to the valleys in one side of the filters, against the bottoms of these valleys and rotating the blades about the filter axis.
REFERENCES:
patent: 2531555 (1950-11-01), Cumming et al.
patent: 2984160 (1961-05-01), Whelton et al.
Ito Yuuji
Matuyama Harukazu
Sakai Masahiko
Shibata Tadahiko
Nippondenso Co. Ltd.
Schmidt Frederick R.
Showalter Robert
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