Process for injection molding arcuately-shaped hollow articles

摘要

Arcuately-shaped hollow articles are injection moulded by: (a) positioning a stack mould (12) with first, second and third mould blocks (76, 78, 80) into an injection moulding machine (10), with the first mould block between the second and third, each of the mould blocks having several cavities. The cavities (86) in the first mould block mate with the cavities (88) in the second and third when the stack mould is closed to form arcuately-shaped cavities. The stack mould also has two pairs of slide carriers (106, 108, 110, 112) movably connected to each of the second and third mould blocks and inner cores (124) secured to each of the slide carriers; (b) closing the stack mould by first moving both pairs of slide carriers such that each of the inner cores is positioned within one of the cavities formed in the second and third mould blocks to form a hollow interior in each of the moulded articles, and then moving the first and second mould blocks against the third; (c) introducing molten material into the cavities and allowing it to solidify; and (d) opening the stack mould by moving the first and second mould blocks away from the third and moving both pairs of slide carriers outward away from the cavities.