| 摘要 |
845,093. Moulding foamed polystyrene. DEUTSCHE FRIGOLIT G.m.b.H. April 24, 1959, No. 14138/59. Class 87(2). [Also in Group XXV] Large blocks of foamed polystyrene are made by filling pre-foamed small particles into the separate chambers of a common mould, the chambers being separated by perforated parallel partitions 7 which extend vertically of the mould and are slightly movable in a direction normal to their main surfaces, closing the mould, subjecting the resin to a short heating by injecting steam, then interrupting the steam supply and slowly cooling the formed blocks before removing them. The partitions 7 are connected by means of edge holes 7a, Fig. 1a, to inwardly projecting pins 7b of the adjoining walls 2, 5 of the mould, the pins having play in the edge holes thus permitting equalisation of the expansion pressure of the pre-foamed material which arises when the softening temperature is attained. Steam is introduced through the perforated walls 2, 3, 6 of the mould from pipes 8 and since the partitions 7 are also perforated, the initially crumbly mass is rapidly traversed by the steam and any condensate is driven out of the mould through the perforations of the remaining walls. To facilitate removal of the moulded bodies after cooling, the cover 4 is hinged and two adjacent side walls 5, 6 are hinged to the two other side walls 2, 3. These hinged side walls are held together by releasable locking means, other releasable locking means being used to secure the hinged side walls to the bottom 1 and the cover 4 to the side walls. |
