Mold having independent movable walls

Details Mold having independent movable walls Mold having independent movable walls

2005-12-23

2010-06-22

Heitbrink, Tim (Department: 1791)

Plastic article or earthenware shaping or treating: apparatus

Shaping surface including means to release or remove product...

By movable mold sections

C425S442000, C425S443000, C425S450100

Reexamination Certificate

active

07740471

ABSTRACT:
A method for manufacturing products using a mold having at least one mold cavity which is at least partly defined by at least two movable wall parts, wherein the mold is closed and the at least two movable wall parts (35A,35B) are brought to a retracted position relative to the mold cavity, so that the volume of the mold cavity is enlarged relative to the volume required for a product to be formed, wherein at least partly molten material is introduced into the mold cavity and then in a first step a first one (35A) of the at least two movable wall parts is set into motion in the direction of a forwardly moved position and in a second step a second one (35B) of the at least two movable wall parts is set into motion in the direction of a forwardly moved position, wherein the movable wall parts are moved into said forwardly moved position for the formation of the product.

REFERENCES:
patent: 4025022 (1977-05-01), Theysohn et al.
patent: 4969811 (1990-11-01), Littleton
patent: 5945045 (1999-08-01), Parker
patent: 6527540 (2003-03-01), Dantlgraber
patent: 7470121 (2008-12-01), Ness et al.

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