| 摘要 |
A process or method for making a unique, double walled, tubular device which is divided into a plurality of substantially vertically extending compartments (42) which are adapted to be filled with water. The double walled, tubular device is made from first and second sheets (11 and 16) of thermoplastic material in which each sheet (11 and 16) has been folded back over itself along its longitudinal dimension. Each sheet (11 and 16) is then subjected to heat sealing treatments in which weld lines (41) are formed in the sheets (11 and 16) thereby forming the vertically extending compartments (42) in each sheet (11 and 16). The first and second sheets (11 and 16) are then superimposed one over the other and mutually respective pairs of additional welded lines (40) are formed so as to seal or weld the double layers of the two sheets (11 and 16) together at spaced positions along the longitudinal length of the superimposed sheets (11 and 16). Each of the weldlines (40) of mutually respective pairs thereof are closely spaced, side-by-side of each other. The respective pairs of weld lines (40) are spaced from other pairs such that a plurality of compartments (42) are included in each of the sheets (11 and 16) between the pairs of weld lines (40). The sheets (11 and 16) are cut transversely of their longitudinal dimension between each of the weld lines (40) in the respective pair of weld lines (40) to produce individual units of the unique, double walled, tubular device of the invention. |
