Pulp Mould Comprising Heating Element with Sintered Necks

1 . A pulp mould, comprising a porous sintered body ( 11 ) having a permeable moulding outer surface.( 13 ) and an inner, permeable surface ( 12 ), wherein a heating device ( 40 ) is arranged within said sintered body ( 11 ), and wherein said body ( 11 ) preferably is arranged on a base plate ( 50 ), characterized in that said heating device ( 40 ) is integrally arranged within said sintered body ( 11 ), by means of sintering necks adjoining the heating device ( 40 ), with the sintered body ( 11 ).

2 . A pulp mould according to claim 1 , characterized in that said heating device ( 40 ) is arranged to have portions ( 40 A, 40 B) arranged on different levels (A, B) in relation to the inner surface ( 12 ) of the sintered body ( 11 ) in the form of at least one heating coil ( 40 ).

3 . A pulp mould according to claim 1 , characterized in that said heating device is in the form of at least one heating coil ( 40 ).

4 . A pulp mould according to claim 3 , characterized in that a first portion ( 40 A) has a periphery that is smaller than the periphery of a second portion ( 40 B).

5 . A pulp mould according to claim 3 , characterized in that said heating coil ( 40 ) comprises a resistor heating arrangement ( 400 , 401 , 402 , 403 , 404 ).

6 . A pulp mould according to claim 5 , characterized by said resistor heating arrangement comprising an inner core ( 402 ) which is heated by means of electrical resistance.

7 . A pulp mould according to claim 5 , characterized in that said resistor heating arrangement includes an outer layer ( 400 ) of metallic material forming sintering necks to the porous body ( 11 ).

8 . A pulp mould according to claim 5 , characterized in that said resistor heating arrangement includes an intermediate layer ( 401 ; 403 , 404 ) which is preferably divided into a lower portion ( 403 ) and an upper portion ( 404 ).

9 . A method for producing a pulp mould, comprising the steps of providing a porous sintered body ( 11 ), having a permeable molding surface ( 13 ) and inner permeable surface ( 12 ), wherein a heating device ( 40 ) is arranged within said sintered body ( 11 ) to heat a pulp object during production by means of said mould, and wherein said body ( 11 ) preferably is arranged on a base plate ( 50 ), characterized by sintering said heating device ( 40 ) and said body ( 11 ) to from sintering necks adjoining the heating device ( 40 ) with the sintered body ( 11 ), to form an integrated body.

10 . A method according to claim 9 , characterized by arranging said heating device ( 40 ) to have different portions ( 40 A, 408 ) extending on different levels (A, B) within the sintered body ( 11 ), in relation to the inner surface ( 12 ) of the sintered body ( 11 ).

11 . A method according to claim 9 , characterized by arranging said heating device in the form of a heating coil ( 40 ), preferably comprising a resistor heating arrangement ( 400 , 401 , 402 , 403 , 404 ).

12 . A method according to claim 11 , characterized by arranging a first portion ( 40 A) to have its periphery covering a smaller area than the periphery of a second portion ( 40 B).

13 . A method according to claim 11 , characterized by said coil ( 40 ) comprising an inner core ( 402 ) which is heated by means of electrical resistance.

14 . A method according to claim 11 , characterized by that said coil ( 40 ) includes at least two layers of material, wherein the outer layer ( 400 ) is of metallic material forming sintering necks to the porous body ( 11 ).

15 . A method according to claim 13 , characterized by having said coil ( 40 ) including an intermediate layer ( 401 ; 403 , 404 ), preferably divided into a lower portion ( 403 ) and an upper portion ( 404 ).