Movable mould member for moulding food products
A moveable mould member is configured for use in an installation for moulding food products from a pumpable foodstuff mass. The mould member has a permeable mould body with an outer surface forming at least part of the outer mould member surface, which outer surface of the permeable mould body is fluid tight; mould cavities and a permeable volume defining fine openings opening out at the mould cavities, such that each mould cavity of the permeable mould body is delimited at least in part by a permeable volume. In addition, the mould drum has, for each group of mould cavities from which food products are to be ejected simultaneously, an ejection fluid inlet allowing the entry of pressurized fluid, and one or more channels extending from the associated ejection fluid inlet to the one or more permeable volumes of the group of mould cavities.
1. A moveable mould member configured for use in an installation for moulding food products from a pumpable foodstuff mass, the mould member having an outer surface, in operation the mould member being movably supported to move in a direction of movement,
wherein the mould member is a rotary mould drum having an outer circumferential drum surface, defined as the outer surface, and a longitudinal drum rotation axis, in operation the drum being rotatably supported in the installation to revolve about the drum rotation axis in a direction of rotation defined as the direction of movement,
wherein the mould member has, in the outer surface, multiple recessed mould cavities, each mould cavity defining a shape of the product which is to be moulded, the mould cavities each having an opening in the outer mould member surface for introduction of foodstuff mass into the mould cavity and for ejection of the moulded product, the mould member having at least one permeable mould body comprising:
an outer surface forming at least part of the outer surface of the mould member, which outer surface of the permeable mould body is fluid tight;
one or more of the mould cavities,
a permeable volume comprising fine openings opening out at the one or more mould cavities,
such that each mould cavity of the permeable mould body is delimited at least in part by a permeable volume,
the mould member further comprising, for each group of mould cavities from which moulded food products are to be ejected simultaneously:
at least one ejection fluid inlet allowing entry of pressurized fluid,
one or more channels extending from the at least one associated ejection fluid inlet to the one or more permeable volumes of the group of mould cavities, and
the one or more channels providing communication from the at least one associated ejection fluid inlet via the channels and via the permeable volumes into the mould cavities to assist in ejection of the moulded products from the group of mould cavities,
wherein the permeable volume delimiting a mould cavity has a first fluid flow resistance P 1 for a flow of ejection fluid into a trailing zone of the cavity, which is different from a second fluid flow resistance P 2 for a flow of ejection fluid into a leading zone of the same one mould cavity, seen in the direction of movement, the first fluid flow resistance P 1 being larger than the second fluid flow resistance P 2 .
2. The mould member according to claim 1 , wherein the first fluid flow resistance P 1 of the permeable volume is caused by:
a relatively low porosity; and/or
a relatively high pore density of the permeable volume, and/or
a relatively large thickness of the permeable volume, between the one or more channels and the mould cavity.
3. The mould member according to claim 1 , wherein the permeable volume comprises distinct components, e.g. of distinct materials, each having a respective one of said first and second fluid flow resistance.
4. A method for moulding of food products from a pumpable foodstuff mass,
wherein use is made of an installation for moulding food products from a pumpable foodstuff mass comprising a moveable mould member having an outer surface, in operation the mould member being moved in a direction of movement,
wherein the mould member is a rotary mould drum having an outer circumferential drum surface, defined as the outer surface, and a longitudinal drum rotation axis, in operation the drum revolving about the drum rotation axis in a direction of rotation defined as the direction of movement,
wherein the mould member has, in the outer surface, multiple recessed mould cavities, each mould cavity defining a shape of the product, which is to be moulded, the mould cavities each having an opening in the outer mould member surface for introduction of foodstuff mass into the mould cavity and for ejection of the moulded product, the mould member having at least one permeable mould body comprising:
an outer surface forming at least part of the outer mould member surface, which outer surface of the permeable mould body is fluid tight;
one or more of the mould cavities,
a permeable volume comprising fine openings opening out at the one or more mould cavities,
such that each mould cavity of the permeable mould body is delimited at least in part by a permeable volume,
the mould member further comprising, for each group of mould cavities from which food products are to be ejected simultaneously:
at least one ejection fluid inlet allowing entry of pressurized fluid,
one or more channels extending from the at least one associated ejection fluid inlet to the one or more permeable volumes of the group of mould cavities, and
the one or more channels providing communication from the at least one associated ejection fluid inlet via the channels and via the permeable volumes into the mould cavities to assist in ejection of the moulded products from the group of mould cavities,
wherein, a position of the mould member in which foodstuff mass is introduced into the mould cavity and another position of the mould member where ejection of the moulded product takes place, a first fluid, comprising a pre-treatment fluid is entered into the one or more channels, said first fluid being introduced via the at least one ejection fluid inlet, said first fluid being water, and
wherein at the position of ejection of the moulded product, an ejection fluid comprising compressed air is entered into the at least one ejection fluid inlet, said ejection fluid assisting the ejection of the moulded products from the group of mould cavities;
wherein the permeable volume delimiting a mould cavity has a first fluid flow resistance P 1 for a flow of ejection fluid into a trailing zone of the cavity, which is different from a second fluid flow resistance P 2 for a flow of ejection fluid into a leading zone of the same one mould cavity, seen in the direction of movement, the first fluid flow resistance P 1 being larger than the second fluid flow resistance P 2 .
5. A moulding installation for moulding food products from a pumpable foodstuff mass, which installation comprises:
a frame,
a mould member according to claim 1 , being movably supported by the frame,
a mould member drive which, in operation, is coupled to the mould member to drive the mould member in a direction of movement,
a mass feed member which, in operation, is arranged at a fill position relative to the mould member surface, said mass feed member being adapted to transfer mass into passing mould cavities of the movable mould member, said mass forming a food product in said mould cavity,
an ejection fluid source arranged at a location to communicate with a passing ejection fluid inlet and configured to enter ejection fluid into said inlet.