Contoured sealing bands
Most applications involving film sealing are limited to straight seams.
Conventional packages such cans and cartons are increasingly being replaced by special bag shapes. In many cases the film bags constitute a lining for the products to be packed which allows appropriate disposal and prevents expensive cleaning. The adaptation of the bag form to the shape of the product to be packed is realised by the contoured sealing method, i.e. the seams are round or rectangular, polygonal or angular.
While high frequency sealing methods are suitable for PVC films, they cannot be used for PE films. The ultrasonic sealing method is partially suitable as it is conditioned by the dimensions of the seam contour.
The heat-contact sealing is an appropriate method for compound film sealing. When processing PE films, however, the seams often do not meet the requirements.
Apart from straight heating bands also contoured sealing bands can be used. The advantages are obvious:
- cost-effective, simple tools,
- in principle, all types of shapes and forms are possible,
- no pre-heating necessary (unlike with permanent heating)
- exact and direct temperature control at the sealing point.
We should be glad to help you in designing contoured sealing bands including the necessary tools.