Wipers for cleanroom use

Details Wipers for cleanroom use Wipers for cleanroom use

1988-04-08

1989-12-19

Bell, James J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Edge feature

15209R, 428193, 428224, 428246, 428913, B32B 2302

Patent

active

048882291

ABSTRACT:
A method and a wiper for reducing particulate contamination which otherwise might result from the use of the wiper in a controlled environment, such as that maintained in a cleanroom, the wiper being of the type constructed at least partially from a thermoplastic fabric material by severing the wiper along peripheral edges thereof from a sheet of such material having indeterminate dimensions, the method and the wiper providing a fused border in the material along the peripheral edges of the wiper and extending inwardly into the wiper a distance great enough to provide the fused border with sufficient area and sufficient tear-strength to maintain therein segments of the material of the wiper which otherwise might be released from the peripheral edges of the wiper during use of the wiper, yet small enough to maintain pliability and absorbency in the wiper for wiping procedures. In one embodiment of the wiper, two outer plies of the material are joined along the fused border to establish a sealed envelope within which is placed an inner ply of absorbent material isolated from the controlled environment by the outer plies of material and the fused border.

REFERENCES:
patent: 2319307 (1971-07-01), Eddy
patent: 2414424 (1947-01-01), Stevens
patent: 3316117 (1967-04-01), Clifford et al.
patent: 3787272 (1974-01-01), Nisbet et al.
patent: 4324827 (1982-04-01), Obayashi et al.
patent: 4384021 (1983-05-01), Aoyama

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