Tool or tool part, system including such a tool or tool part, method of producing such a tool or tool part and method of molding a product from a pulp slurry
AssigneeCelwise AB
InventorsJohn Andersson, Udo Vogt, David A. Pierce
Life of this patent
Estimating the term…
Abstract
The present document discloses a tool or tool part for use in a process of molding a product from a pulp slurry. The tool or tool part comprises a self-supporting tool wall portion having a product face, for contacting the product, and a back face on the other side of the wall relative to the product face. The tool wall portion presenting pores, which are provided by a plurality of channels extending through the tool wall portion, from the product face to the back face. The channels are straight or curved with no more than one point of inflection.
Claims5
A method of molding a product from a pulp slurry, the method comprising:
- in a first step, providing a pickup tool, for picking up pulp from a pulp slurry, the pickup tool comprising a self-supporting pickup tool wall portion having a product face, for contacting the product, and a back face on the other side of the wall relative to the product face, the pickup tool wall portion presenting pores, which are provided by a plurality of channels extending through the pickup tool wall portion, from the product face to the back face;
- applying a vacuum to the back face of the pickup tool, and
- applying pulp slurry to the product face of the pickup tool;
- in a second step, providing a transfer tool for receiving an amount of pulp from the pickup tool, the transfer tool comprising a self-supporting transfer tool wall portion having a product face, for contacting the product, and a back face on the other side of the wall relative to the product face, the transfer tool wall portion presenting pores, which are provided by a plurality of channels extending through the tool wall portion, from the product face to the back face;
- applying a vacuum to the back face of the transfer tool, and
- applying the pulp slurry from the pickup tool to the product face of the transfer tool;
- and
- in a third step, providing a pressing tool for pressing an amount of pulp to form a molded product, the pressing tool comprising a self-supporting pressing tool wall portion having a product face, for contacting the product, and a back face on the other side of the wall relative to the product face, the pressing tool wall portion presenting pores, which are provided by a plurality of channels extending through the tool wall portion, from the product face to the back face, the pressing tool forming part of a pressing arrangement comprising a male pressing tool and a female pressing tool, the male pressing tool and female pressing tool being movable relative one another between an open position and a pressing position;
- applying a vacuum to the back face of at least one of the male or female pressing tool,
- applying the pulp slurry from the transfer tool to the product face of the male pressing tool or of the female pressing tool when the male pressing tool and the female pressing tool are in their open position, and
- when in the pressing position, heating at least one of the male or female pressing tool, and
- forcing the male pressing tool and the female pressing tools towards each other, such that the pulp slurry is pressed between product faces of the respective tool.
Dependencies are inferred from the claim text.