| 摘要 |
<p>Adhesive material (16) is directed by two gumming applicators (12, 13) onto selected portions (P1, P2) of a wrapping material (3) as it advances in a given feed direction (4) at a predetermined velocity (V), with no interruption in the movement of the wrapping material (3). The two applicators (12, 13) make a forward pass and a return pass, each composed of two constituent passes during which the adhesive material is deposited simultaneously along respective first and second segments (T1' T1") of a first trail (T1) in the forward direction and similarly along respective first and second segments (T2' T2") of a second trail (T2) in the reverse direction, each complete trail (T1, T2) extending transversely and substantially across the full width (L) of the wrapping material (3). <IMAGE></p> |
