MOULDING OF SYNTHETIC PLASTICS SHEET MATERIAL

摘要

This invention discloses a novel mould for the moulding of plastics material lids provided with rims. The mould is characterized by two one-piece mould parts which clamps the heated plastics sheet material and form the rim by a clamping and shearing effect. The remainder of the lid preferably is formed by pressure forming using gaseous medium. The mould is particularly useful in the moulding of foodstuff containers, for example, containers for beverages and provides the advantages of injection moulding without the disadvantage of high tooling costs as encountered in the prior art.