| 摘要 |
<p>Adjacent surfaces of man-made plastics elements, 0.9. a thermoplastic dispensing tip and a thermoplastic container of a dispenser are welded to one another by generating localized heat at the interface of the surfaces. After insertion of the base of a dispensing tip (22), Fig. 4, within the neck (12) of a filled container (10), ultrasonic vibrations may be transmitted by a probe (30) in contact with the dispensing tip (22) across the interfacing surfaces (54). of the base of the dispensing tip (22) base and the interior of the container neck (12). Alternatively, the base of a dispensing tip (54), Fig. 8, is inserted within a tight fitting neck of a filled container (40) simultaneous with or prior to relative rotational movement therebetween. The heat generated by frictional interference between the dispensing tip base and the interior surface of the neck as a result of the relative rotation therebetween raises the temperature of the interfacing surface of the dispensing tip base and container neck interior sufficiently to weld these surfaces to one another. To prevent pressure build-up in the container (40), a plunger (56) pushes in a wall thereof to compensate for the volume displacement caused by the insertion of the base (58) of the tip (54). <IMAGE></p> |
