There are numerous types of end seal insert styles, with each working with various film types and gauges. Manufacturers like Texwrap have extensive experience with film and sealing systems and have narrowed it down to a few styles that work for most end seal applications.
First let us look at the basic elements of the sealing area shown in Figure 1. The gray areas represent the inner and outer components of the end seal. And the red represents the actual sealed film.
Now let us look at Illustrations of the main types of end seal inserts Texwrap generally uses, and the films they are most compatible with.
Types of Texwrap End Seal Inserts
This is a very standard seal insert that works well on all films including soft (polyethylene) polyolefins, shrink poly, and PVC.
The Pancake insert makes a much broader seal and works well with heavier gauges of poly & polyolefin films.
This type of sealing insert works well with polypropylene based films and requires a firmer pad & higher heat. The Arrow insert is a two piece insert and makes a heavier bead than the Sharp Knife insert. If required, the cutting blade can be removed and replaced.
The Sharp Knife insert is like the Arrow insert and works well with polypropylene based films and requires a firmer pad & higher heat. It is a one piece insert that seals and cuts the film.
Works well with thin gauges of polyolefin films, makes a heavier bead. (Use when the mushroom fails)
Used on poly & polyolefin films when an open seal is required on one side, to use as a bag.
This is a general overview of a few seal bar styles and the type of seal you can expect. We will help you select a seal head that is compatible with the film you are using, and will consistently produce strong, reliable seals.