Plastic sheeting and a mould therefor

摘要

In a plastic sheeting material incorporating an array of bubble cells, the cells are shaped with two chambers connected by a constricted region. The chambers are part-spherical e.g. in the form of truncated spheres. The constricted region has concave side walls and/or a concave top wall. The sheeting may have two, three or more layers. Molds for producing the sheeting material have suitably-placed suction holes.

主权项

1. A plastic sheeting incorporating an array of bubble cells, wherein each cell comprises first and second chambers interconnected by a relatively constricted region, the cells being arranged spaced apart in columns defining a longitudinal direction parallel to the straight line connecting the centres of the chambers of each cell, wherein in the transverse direction perpendicular to the longitudinal direction, the centre of a first chamber of each cell is aligned with a spacing between adjacent cells in an adjacent row and the centre of the second chamber of each cell is aligned with the centre of the constricted region of an adjacent cell in the adjacent row, the chambers having a circular shape in plan view, wherein the interconnecting regions have arcuate sides which are concave in plan view; and
comprising a first layer, which incorporates the bubble shapes, laminated to a substantially flat second layer.