초록 ▼

The disclosure relates to a vacuum sizing device for cooling and sizing plastic extrusions immediately downstream of the extrusion die. The device includes a plurality of pairs of upper and lower sizing elements which are clamped between upper and lower backing members. The elements are shaped to de

The disclosure relates to a vacuum sizing device for cooling and sizing plastic extrusions immediately downstream of the extrusion die. The device includes a plurality of pairs of upper and lower sizing elements which are clamped between upper and lower backing members. The elements are shaped to define a passageway through the sizing device having a cross-sectional shape and size corresponding to the required profile shape and size of the extrusion. Vacuum chambers and cooling chambers are provided in the sizing elements.

대표청구항 ▼

A vacuum sizing device having a passageway which extends longitudinally therethrough and which has a cross-sectional size and shape corresponding to the required profile size and shape of a plastic extrusion to be sized in the device, wherein the device comprises: a plurality of pairs of respective

A vacuum sizing device having a passageway which extends longitudinally therethrough and which has a cross-sectional size and shape corresponding to the required profile size and shape of a plastic extrusion to be sized in the device, wherein the device comprises: a plurality of pairs of respective upper and lower sizing elements, each pair of elements being shaped to define therebetween a longitudinal portion of said passageway and the pairs of elements being disposed end to end and maintained in co-operating relationship in which the elements together define the whole of said passageway; upper and lower backing members disposed respectively above and below said pairs of sizing elements and extending over the entire length of said passageway, and means releasably securing said backing members together to maintain the pairs of sizing elements in said co-operating relationship; each said sizing element being an individual component and at least some of said elements being provided with one or both of a vacuum port which communicates with vacuum openings into said passageway, and a cooling fluid port communicating with a cooling fluid chamber in said element, said port or ports opening into a face of the element which is accessible from externally of the device.