| 摘要 |
Structure of semifinished product (10) for floating products comprising a plurality of layers (la-Id) of flexible material having density less than w ater, for example foam polyethylene, mutually constrained to each other. In particular, the layers (la-Id) are arranged according to an overlapped confi guration and then constrained at fastening points, for example, seams (6) ma de by a stitching head (50) equipped with one or more needles (55) acting al ong a direction (60) substantially orthogonal to the layers (la-Id). Each se am point (6) is, in particular, insulated, i.e. is made in order to result d istanced from the other seams (6). This is to avoid the production of weaken ing lines, or zones, in the semifinished product (10) and to obtain, then a highly flexible product and at the same time having a high mechanical resist ance. The seams (6) can be made in a random way or following a predetermined scheme to provide a homogeneous distribution on all the surface of the laye rs (la-Id). Certain seams (6) can be connected by a segment of thread (7) in order to reduce the number of cutting operations in the seaming process.</S DOAB> |
