초록 ▼

An injection moulding process for moulding a material in a mould having a mould cavity and at least one channel communicating with the mould cavity, each channel entering the mould at a respective mould inlet includes the steps of heating inner surface areas of the mould to a temperature above the h

An injection moulding process for moulding a material in a mould having a mould cavity and at least one channel communicating with the mould cavity, each channel entering the mould at a respective mould inlet includes the steps of heating inner surface areas of the mould to a temperature above the heat distortion temperature of the material; supplying the molten material into the mould by way of at least one channel and subjecting the molten material to a propelling force, sufficient to propel it through the channel into the mould; causing the molten material in the mould to solidify; applying periodic forces to the material in the mould at a plurality of spaced-apart regions, first and second of the regions being located either side of molten material in the mould cavity, the periodic force being applied with a difference in phase so as to cause shear of molten material within the mould cavity between the first and second regions; cooling the mould below the heat distortion temperature of the resin while or after applying the periodic force; and then opening the mould, and removing the moulded article.

대표청구항 ▼

[ What is claimed is:] [1.] An injection moulding process for moulding a molten material, containing at least one kind of thermoplastic resin having a heat distortion temperature and a melt processing temperature, in a mould having a mould cavity and at least one channel communicating with the mould

[ What is claimed is:] [1.] An injection moulding process for moulding a molten material, containing at least one kind of thermoplastic resin having a heat distortion temperature and a melt processing temperature, in a mould having a mould cavity and at least one channel communicating with the mould cavity, each channel entering the mould at a respective mould inlet, the process comprising:heating inner surface areas of the mould to the melt processing temperature of the material prior to supplying the molten material into the mould;supplying the molten material into the mould by way of at least one channel and subjecting the molten material to a propelling force, sufficient to propel it through the channel into the mould;applying periodic forces to the material in the mould at a plurality of spaced-apart regions, a first and a second of the regions being located on either side of the molten material in the mould cavity, the periodic force being applied with a difference in phase so as to cause shear of the molten material within the mould cavity between the first and second regions;allowing the molten material in the mould to solidify by cooling the mould below the heat distortion temperature of the resin while or after applying the periodic force; and thenopening the mould, and removing the moulded article.