Mould member with foreign object detection

A method of moulding products from a mass of food stuff, comprising:

• pumping the mass with a pump towards a mould member;
• detecting an unwanted object in the mass with a detection means;
• removing the unwanted object and a portion of the mass with a valve, the valve is located between the detection means and the mould member;
• moving a mould cavity of a mould member past a feed channel;
• filling the mass into the mould cavity to form a product;
• determining if a predetermined filling pressure in the mould cavity has been reached;
• wherein when the mould cavity is in a discharge position, the method comprises:
• i) ejecting a gas through a porous sidewall and/or a porous bottom of the mould cavity to eject the product from the mould cavity if the predetermined filling pressure is reached, or
• ii) not ejecting the gas through the porous sidewall and/or the porous bottom of the mould cavity so that the product is not ejected from the mould cavity if the predetermined filling pressure is not reached after the removing step;
• wherein the filing step takes place when the mould cavity is in a filing position, and after the step of not ejecting the gas, the mould cavity is rotated back to the filling position until the predetermined filling pressure is reached and then the ejecting step takes place after the mould cavity is moved into the discharge position.