De-aeration cavities in a mould member

1. A food product forming apparatus comprising:

a mould drum comprising a multitude of product cavities, each of the multitude of product cavities comprise a bottom wall and a sidewall made of a porous material;

an infeed channel 1 mass is supplied to the mould drum;

a fluid passage, which extends in a longitudinal direction of the mould drum;

a pair of stabilization blocks, one of which is arranged upstream of the infeed channel and a second of which is arranged downstream of the infeed channel;

a seal plate;

one or more piston/cylinder arrangements that are arranged above each of the pair of stabilization blocks and that are controlled and configured to press the pair of stabilization blocks against the seal plate to cause the seal plate to be moved relative to a surface of the mould drum to change a size of a gap that is defined between the seal plate and the surface of the mould drum during filling of the multitude of product cavities with the food mass; and

a controller configured to control the one or more piston/cylinder arrangements to change the size of the gap;

wherein during the filling of the multitude of product cavities, entrapped air within one or more of the multitude of product cavities is removed therefrom through the porous material, the fluid passage, and the gap.

2. The food product forming apparatus according to claim 1 , wherein the food product forming apparatus comprises a valve.

3. The food product forming apparatus according to claim 1 , wherein the gap between the mould drum and the seal plate is defined only at an upstream end of the multitude of product cavities while the seal plate is in contact with the surface of the mould drum at a downstream end of the multitude of product cavities.

4. The food product forming apparatus according to claim 1 , wherein the controller is configured to create the gap between the seal plate and the surface of the mould drum by releasing pressure acting on the seal plate and the controller is configured to close the gap between the seal plate and the surface of the mould drum by increasing the pressure acting the seal plate.

5. The food forming member according to one claim 1 , wherein the multitude of product cavities are at a circumference of the mould drum.

6. The food product forming apparatus according to claim 4 , wherein the pressure between the seal plate and the surface of the mould drum is released until entrapped the air escapes through the gap.

7. The food product forming apparatus according to claim 2 , wherein the food product forming apparatus comprises a valve in the seal plate that is controlled by the controller to open during and/or after the filling of the multitude of product cavities.

8. The food product forming apparatus according to claim 1 ,

wherein when a pressure in one or the multitude of product cavities exceeds a certain pressure limit, then the controller is configured to create the gap between the surface of the mould drum and the seal plate through which the entrapped air gas can escape; and

wherein after the pressure in the one or the multitude of product cavities falls below another pressure limit, then the controller is configured to reduce the size of the gap or close the gap.

9. The food product forming apparatus according to claim 1 , wherein the gap exists before, while, or after one or the multitude of product cavities are filled.

10. A food product forming apparatus comprising:

a mould drum comprising a multitude of product cavities, each of the multitude of product cavities comprise a bottom wall and a sidewall made of a porous material;

an infeed channel through which food mass is supplied to the mould drum;

a fluid passage, which extends in a longitudinal direction of the mould drum;

a pair of stabilization elements, one of which is arranged upstream of the infeed channel and a second of which is arranged downstream of the infeed channel,

a seal plate, which sealingly cooperates with a surface of the mould drum to define a gap between the seal plate and the surface of the mould drum;

one or more inflatable bellows that are configured to apply pressure on the pair of stabilization elements to press the stabilization elements against the seal plate to cause the seal plate to move towards the surface of the mould drum to reduce a size of the gap or to close the gap during filling of the multitude of product cavities, and the one or more inflatable bellows are configured to reduce the pressure acting on the pair of stabilization elements to reduce the pressure on the seal plate to increase the size of the gap during filling of the multitude of product cavities;

a controller configured to control the one or more inflatable bellows to increase the pressure on the pair of stabilization elements to close the gap during filling of the multitude of product cavities, and then the controller is configured to control the one or more inflatable bellows to reduce the pressure acting on the pair of stabilization elements to create or increase the size of the gap during the filling of the multitude of product cavities.

11. The food product forming apparatus according to claim 10 , wherein the seal member comprises an upstream end and an opposing downstream end, the upstream end is deformed and deflected away from the surface of the mould drum when the pressure is applied on the seal plate by the one or more inflatable bellows, while the downstream end of the seal member remains pressed against the surface of the mould drum.