Porous mould drum for poultry, pork, meat-replacement and vegetarian food
A rotary cylindrical mould member for moulding products from a food starting material having at least one mould body having a curved outer surface, the at least one mould body is made from a porous material with a porous structure of intercommunicating pores, the outer circumference is at least partially sealed airtight, the at least one mould body has at least one mould cavity formed in the curved outer surface and having at its porous bottom wall and/or its porous sidewall and/or its boundary a deformation layer formed by plastic deformation from a milling operation, the mould member having a gas supply which forces a fluid gas through the inner volume and the deformation layer into the at least one cavity to assist the removal of moulded products, an average flow resistance of the deformation layer is 1-30% of the average flow resistance of the inner volume.
1 . A rotary cylindrical mould member for moulding products from a food starting material comprising poultry, pork, meat-replacement and vegetarian food, the mould member having a longitudinal axis and an outer circumference, the mould member comprising at least one mould body having a curved outer surface forming at least part of the outer circumference of the mould member and an opposite inner surface, wherein the at least one mould body is made from a porous material with a porous structure of intercommunicating pores, wherein the outer circumference is at least partially sealed airtight, wherein the at least one mould body comprises at least one mould cavity in which the food starting material is moulded, the at least one mould cavity being formed in the curved outer surface, the at least one mould cavity comprising a porous bottom wall, a porous sidewall, and a boundary, wherein at least one of the porous bottom wall, the porous sidewall, and the boundary comprises a deformation layer formed by plastic deformation; from a milling operation, the at least one mould body comprises an inner volume between the deformation layer and the inner surface, the mould member further comprising a gas supply which forces a fluid gas through the inner volume and the deformation layer into the at least one mould cavity to assist with removal of moulded products from the at least one mould cavity, wherein an average flow resistance of the deformation layer (FR1) is 1%-30% of an average flow resistance of the inner volume (FR2).
2 . The rotary cylindrical mould member according to claim 1 , wherein an average porosity of the inner volume is 15%-50% by volume.
3 . The rotary cylindrical mould member according to claim 1 , wherein an average pore size of the inner volume is 10 μm-100 μm determined using a linear intercept method.
4 . The rotary cylindrical mould member according to claim 1 , wherein the at least one mould cavity is a 2D, wherein the porous bottom wall is curved.
5 . The rotary cylindrical mould member according to claim 4 , wherein an average open surface porosity of the deformation layer is greater than 10%.
6 . The rotary cylindrical mould member according to claim 1 , wherein the plastic deformation of the porous sidewall is higher than the plastic deformation of the porous bottom wall.
7 . The rotary cylindrical mould member according to claim 1 , wherein the at least one mould cavity is a 3D-cavity comprising at least-a contoured bottom wall.
8 . The rotary cylindrical mould member according to claim 7 , wherein an average porosity of the deformation layer is 10%-50%.
9 . The rotary cylindrical mould member according to claim 1 , wherein an average thickness of the deformation layer is 0.05 mm-1 mm.
10 . The rotary cylindrical mould member according to claim 1 , wherein a total average pressure drop (FR1+FR2) per mould cavity is 300 mbar-400 mbar.
11 . The rotary cylindrical mould member according to claim 1 , wherein a total average pressure drop (FR1+FR2) per mould cavity is 120 mbar-160 mbar.
12 . The rotary cylindrical mould member according to claim 1 , wherein a total average flow resistance (FR1+FR2) is 102%-120% of the average flow resistance of the inner volume (FR2).
13 . The rotary cylindrical mould member according to claim 1 , wherein the porous structure defines a continuous fluid flow path from the inner volume outward through the porous bottom wall and/or the porous sidewall of the at least one mould cavity such that a venturi effect is produced through the deformation layer, whereby the fluid passing from the inner volume through the deformation layer exhibits an increased velocity in the deformation layer relative to a velocity of the fluid gas within the inner volume.