System for thermoforming articles such as picnic plates in a pai

Details System for thermoforming articles such as picnic plates in a pai System for thermoforming articles such as picnic plates in a pai

1985-02-19

1987-01-13

Silbaugh, Jan

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Starting material is nonhollow planar finite length preform...

264545, 264551, 264553, 264153, 2642974, 2642975, 4253021, 425339, 425341, 4253421, B29C 5110, B29C 5120

Patent

active

046363483

ABSTRACT:
A system for producing generally concavo-convex synthetic plastic containers and like articles, such as picnic plates wherein a mold station has a stationary intermediate mold with projecting male mold parts on one side and directly opposite recessed female mold cavities in alignment therewith on the other side. A first movable mold, on the side of the intermediate mold having the male mold parts is provided with recessed mating female mold cavities of the same dimensions as the said cavities in the intermediate mold and a second movable mold on the other side of the intermediate mold has aligned projecting male mold parts mating with the cavities in the intermediate mold. A pair of heated, moldable synthetic plastic webs are advanced in unison to opposite sides of the intermediate mold and are later removed in unison from the mold station. The heated sections of the webs are moved in unison to opposite sides of the intermediate mold when the said first and second movable molds are separated therefrom. Then the first and second movable molds are driven toward the intermediate mold to thermoform identical products in both of the webs. After this, the first and second movable molds are moved away from the intermediate mold and the webs are indexed to remove the products formed from the mold station. The webs are converged toward one another after leaving the mold station to nest the aligned articles formed in the respective webs in pairs and then pairs of the nested articles are punched from the webs in a single relative movement of a punch and severing die.

REFERENCES:
patent: 2518565 (1950-08-01), Nicolle
patent: 3767501 (1973-10-01), Thiel
patent: 4427476 (1984-01-01), Beck et al.

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