Process for making filter cups

Details Process for making filter cups Process for making filter cups

1978-06-21

1980-11-25

Baldwin, Robert D.

Manufacturing container or tube from paper; or other manufacturi

Container making

Rigid container

83188, 493 74, 493154, B31D 500, B31F 700

Patent

active

042351600

ABSTRACT:
A percolator having a cylindrical basket concentric with a wand is provided with a filter paper cup having an annular bottom coextensive with the bottom of the basket and having upstanding fluted sides. The filter cups are formed by cutting and forming them into a nest of cups having an imperforate bottom, transferring the nest of cups to a frusto-conical die having a circular top commensurate with the circular bottom of the filter cups, a central die-hole, and outwardly and downwardly flaring sides corresponding to the natural outward flare of the nested cups, and punching an axial hole in said nested cups while on said die by means of a punch complementary with said die-hole.

REFERENCES:
patent: 2772735 (1956-12-01), Wakelee
patent: 3550421 (1970-12-01), Stakel
patent: 4075107 (1978-02-01), Smith
patent: 4094234 (1978-06-01), Olney et al.
patent: 4101627 (1978-07-01), Menier

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