Porous Sintered Pulp Mould Comprising a Partially Machined Flat Bottom Surface

1 . A pulp mould, comprising a porous sintered body ( 11 ) having an outer surface ( 13 ) and an inner surface ( 12 ), characterized in that a limited area ( 14 ) of said inner surface ( 12 ) is machined providing a machined surface ( 14 ), surrounding an unmachined portion of said inner surface ( 12 ).

2 . A pulp mould according to claim 1 , characterized in that said machined surface ( 14 ) extends in one and the same plane.

3 . A pulp mould according to claim 1 , characterized in that said machined surface ( 14 ) extends from the outer side edges of the mould into inner portions.

4 . A pulp mould according to claim 1 , characterized in that said unmachined portion of said inner surface ( 12 ) protrudes to a lower level compared to said machined surface ( 14 ).

5 . An assembly of a pulp mould according to claim 1 and a base plate, characterized in that said base plate ( 50 ) is arranged with a vacuum chamber ( 51 ) and mating support surfaces ( 55 ) to interfit with said machined surface ( 14 ) of said pulp mould.

6 . An assembly according to claim 5 , characterized in that said unmachined portion of said inner surface ( 12 ) of the pulp mould protrudes into said vacuum chamber ( 51 ) to a level below the plane of said support surface ( 55 ).

7 . An assembly according to claim 5 , characterized in that said base plate ( 50 ) includes at least one portion of a vacuum channel ( 52 ′, 52 ″) in connection with said vacuum chamber ( 51 ).

8 . An assembly according to claim 7 , characterized in that at least a portion of said channel ( 52 ′) is at least partly arranged to form an open channel in the rear surface ( 57 ) of said base plate ( 50 ).

9 . An assembly according to claim 5 , characterized in that said base plate ( 50 ) includes a plurality of vacuum chambers ( 51 ), preferably arranged with a common supply channel ( 52 ′) or portion of said channel ( 52 ′).

10 . A method for producing a pulp mould comprising the steps of providing a porous sintered body ( 11 ) having an outer surface ( 13 ) and an inner surface ( 12 ), characterized by machining a limited area ( 14 ) of said inner surface ( 12 ) thereby providing a machined surface ( 14 ) surrounding an unmachined portion of said inner surface ( 12 ), preferably by arranging said machined surface ( 14 ) to extend in one and the same plane.

11 . A method for producing a pulp mould according to claim 10 , characterized by arranging said machine surface ( 14 ) to extend from the outer side edges of the mould into inner portions.

12 . A method for producing a pulp mould according to claim 10 , characterized by arranging said unmachined portion of said inner surface ( 12 ) to protrude to a lower level compared to said machined surface ( 14 ).

13 . A method for producing an assembly of a pulp mould according to claim 10 and a base plate, characterized by arranging said base plate ( 50 ) with a vacuum chamber ( 51 ) and mating support surfaces ( 55 ) to interfit with said machined surface ( 14 ) of said pulp mould, preferably by arranging said unmachined portion of said inner surface ( 12 ) of the pulp mould to protrude into said vacuum chamber ( 51 ) to a level below the plane of said support surface ( 55 ).

14 . A method for producing an assembly according to claim 12 , characterized by having said base plate ( 50 ) including at least one portion of a vacuum channel ( 52 ′, 52 ″) in connection with said vacuum chamber ( 51 ), preferably by arranging at least a portion of said channel ( 52 ′) to be at least partly arranged to form an open channel in the rear surface ( 57 ) of said base plate ( 50 ).

15 . A method for producing an assembly according to claim 10 , characterized by having said base plate ( 50 ) including a plurality of vacuum chambers ( 51 ), preferably by arranging said plurality of vacuum chambers ( 51 ) with a common supply channel ( 52 ′) or portion of said channel ( 52 ′).