초록

A method for manufacturing a plastic board comprising a sandwich-like structure comprises the steps of:

대표청구항 ▼

[What is claimed is:] [1.](1) providing an injection moulding device with a plastic-plasticizing and injection device and a mould which comprises at least two mould parts displaceable relative to each other, which mould parts in a closed first extreme position bound a mould cavity which connects ont

[What is claimed is:] [1.](1) providing an injection moulding device with a plastic-plasticizing and injection device and a mould which comprises at least two mould parts displaceable relative to each other, which mould parts in a closed first extreme position bound a mould cavity which connects onto the plasticizing and injection unit and which has a shape adapted to the shape of the board for manufacturing, and which mould parts in an open second extreme position release a formed board for removal;(2) manufacturing a cover foil preform with an undercut peripheral edge shape which is adapted to the shape of the board for manufacturing such that the cover foil can extend round the peripheral edge of the board for manufacturing;(3) placing the preform against a wall of the opened mould cavity remote from a plastic feed opening connected to the plastic-plasticizing and injection device and holding said preform in position therein by means of holding means;(4) closing the mould cavity and energizing the plasticizing and injection unit to inject into the mould cavity plasticized plastic which can adhere with the preform;(5) ending the energizing of the plasticizing and injection unit;(6) expanding the mould cavity by moving the mould parts in the direction of the second extreme position without opening the mould cavity; and(7) causing the formed board with cover foil adhered thereto to cool to a chosen temperature, fully opening the mould cavity and removing the manufactured board.