Why are vacuum sealing problems becoming more common?

Many food producers tell us they are seeing more jars losing vacuum than they did a few years ago.

The closing machine often gets the blame, but in many cases the real cause lies elsewhere.

Today's packaging materials have changed.

• More variation in glass quality 
• More variation in lid quality 
• The growing use of PVC-free lid compounds 

Especially PVC-free compounds require much more accurate temperature control.

If the compound is too cold, it may not form a proper seal and can slowly spring back after closing, causing vacuum loss.

If the compound is too hot, the closing head may rotate through the softened compound, resulting in leakage as well.

Finding the right balance has become increasingly important.

That is exactly why we developed our Pre-Heat system.

By heating every lid to a precisely adjustable temperature immediately before closing, the compound reaches the glass under optimal conditions.

The result:

✅ More reliable vacuum sealing
✅ Better seal integrity
✅ Fewer leaking jars
✅ Less product waste
✅ Fewer customer complaints and returns
✅ Greater process consistency, especially with PVC-free lids

The system automatically lowers its temperature when no lids are supplied, preventing unnecessary overheating and minimizing the risk of burnt lids. 

For food manufacturers, a leaking lid is more than a quality issue. It can lead to production losses, product waste, customer claims and, in the worst case, expensive product recalls. Investing in consistent seal quality is often far less expensive than dealing with the consequences of failed closures. 

Are you experiencing more sealing issues? We'd be happy to discuss how to improve your sealing reliability.