| 摘要 |
<p>According to a method for stretching an upper fitted on a last, a shoe upper-last assembly is firstly formed and then positioned in a first station (Sl) where heating means, situated in the first chamber (2a), are activated so as to "hit" the upper-last assembly (M) with a flow of hot air. A vacuum source is activated for creation of a vacuum condition in the first chamber (2a), in order to increase the leather porosity, and the a flow of steam is introduced in the first chamber (2a) to increase the percentage of humidity inside the first chamber (2a). Then the heating means are deactivated and the vacuum condition is removed. The upper-last assembly (M) in then moved to a second station (S2), where heating and ventilation means (6), situated in the second drying chamber (5), create a movement of hot air hitting the upper-last assembly in order to dry the upper leather. The heating and ventilation means are then deactivated and the upper-last assembly (M) is moved again to a third station (S3), where a vacuum condition is created to eliminate a further quantity of humidity present in the leather, and bring the leather back to its natural humidity. Lastly, the vacuum condition in the third station is removed.</p> |
