PVC Film Substitute
In general, there has been greater impetus to replace PVC when the application is and longer duration. An example is ostomy bags which require extensive testing for prolonged and direct dermal contact. By contrast, billboards will probably be the last to change.
Click for a 22-minute short course on PVC replacement issues.
A product with an unknown destination must be PVC free. In other words, it must be assumed the product will end up in a country which bans PVC.
What performance characteristic makes PVC so much different from other polymers?
The PVC molecule reacts with both chemicals and radio waves unlike other inert polymers. This makes PVC a natural for RF welding; adhesives and inks have been designed for compatibility with PVC.
Substitution of an inert polymer such as polypropylene and polyethylene has ramifications. They do not react with inks, adhesives and RF radio waves as PVC does and cost more than PVC.
is very popular with RF welders because it slightly resembles PVC at a molecular level. works on the principle of a “polar” molecule which spins when bombarded with radio frequency (RF) waves. This phenomena creates frictional heat from the inside out vis-à-vis heat sealing which welds by heating from the outside..
All so-called polar resins are not created equal. On the 10 scale, PVC is the most polar and therefore most sensitive to RF. Urethane is about a 6; PEVA is about a 3; polyethylene and polypropylene are both zero.
Non polar resins can be RF welded by simply substituting a different . Cycle times are usually double the PVC cycle times because polyethylene needs more time to cool down.
It is unrealistic to expect a non-polar film to react to RF waves just like a polar material. The latest generation sealing machines from combine RF and heat sealing for fast cycles.
or visit us at the
booth #3909, November 20-22, 2013.
We can match the “hand” of your vinyl very closely in natural, pigmented, high gloss, low gloss or embossed in over 20 patterns.
films are hybrids of food grade polypropylene and polyethylene. The CPSIA has determined that these materials are exempt from testing because they are generally presumed not to have phthalate esters. Even though we knew this to be true, we had some outgassing tests done at . if you want a copy of the results.
Finding an acceptable alternative to PVC then integrating it with your process and other materials is tough at best. We have dealt with these issues since the late 1990's. We can probably help you shorten your learning curve.