| 摘要 |
<p>The reinforcement in the longitudinal direction of a thermoplastic thermoshrinkable product by bar band or threads by means of a known process leads to rigid thermoshrinkable products if the reinforcements are originally rigid such as metal reinforcements or the like. If said reinforcement are flexible of the filament type of fibre glass, aramide, carbon, the thermoshrinkable product will remain flexible. The aim of the present invention is to introduce a flexible reinforcement element in the thermoshrinkable product which becomes rigid only during the application, that is to say during the setting and therefore during shrinkage of the product. The handling remains easy before the setting since the flexibility is preserved, the reinforcement being flexible and the stiffness is obtained after implementation and gives a more efficient reinforcement. This phenomenon may be obtained by means of the process of the impregnated thermoplastic fibre (FIT) by means of a known process. As a fact, the preimpregnated fibre remains flexible due to the grain of powder contained therein, grains which are not melted but let the fibres forming the rovings (8) free to play between each other and said roving becomes rigid and forms a composite material (10) when applying temperature.</p> |
