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
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.
1. 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.
2. The method as claimed in claim 1 , wherein the channels of the pickup tool are straight or curved with no more than one point of inflection.
3. The method as claimed in claim 1 or 2 , wherein the channels of the transfer tool are straight or curved with no more than one point of inflection.
4. The method as claimed in claim 1 , wherein the channels of the pressing tool are straight or curved with no more than one point of inflection.
5. The method as claimed in claim 1 , further comprising:
providing a second transfer tool for receiving an amount of pulp from the female or male pressing tool, the second 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 second transfer tool, and
applying the pulp slurry from the female or male pressing tool to the product face of the second transfer tool; and
providing a second pressing tool for pressing an amount of pulp to form a molded product, the second 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 second pressing tool forming part of a second pressing arrangement comprising a second male pressing tool and a second female pressing tool, the second male pressing tool and second 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 second male or second female pressing tool,
applying the pulp slurry from the second transfer tool to the product face of the second male pressing tool or of the second female pressing tool when the second male pressing tool and the second female pressing tool are in their open position, and
when in the pressing position, heating at least one of the second male or second female pressing tool, and
forcing the second male pressing tool and the second female pressing tools towards each other, such that the pulp slurry is pressed between product faces of the respective tool.