QUOTE ( @ 2009-06-01)
What is the vacuum pull rate for the leak test
We work with our customers to determine what the appropriate pressure to test to is. It will depend on a number of variables including: container, diameter of foil and materials involved. For example a recent customer asked us to test at a value of 8in. Hg, for 30 seconds. Unfortunately, there are no ASTM, or any other kind of specification concerning the testing of induction seals. Everyone seems to have their own method, including squeezing the bottle, to standing on it.
QUOTE ( @ 2009-06-01)
Please detail which products cause the most problems in sealing when some of the product remains on the container finish due to poor filling conditions. Thanks
Normally, liquid products on the lip of the container don’t affect the sealing process. The pressure from the application torque, along with the heat created by the induction process, usually dissipates the liquid. However, solids are another issue. If you have a piece of pickle, or tomato on the lip of the container, your chances for a good seal are slim.
QUOTE ( @ 2009-06-01)
What is general rule of thumb for minimum \’land\’ area/thickness of package for good seal integrity?
Normally we recommend 40-60 thousandths of an inch for a good sealing area. However, the quality of the area is more important than the width. Actually, you could seal on a knife edge, however, because of the thinness you would encounter a lot of melt, which may result in a problem resealing the container after removing the seal. The thinner the width the more lip melt you will experience. If you have any questions, you can contact me (Bill Zito) at 1-262-255-6070.
QUOTE ( @ 2009-06-01)
Are blow-trim bottles not recommended for induction sealing?
You can generally seal to just about any surface, providing there is not a lot of irregularity, or defects in the lip area. For small amounts of flash, or parting lines, the heat from induction process along with the pressure from the application torque will help overcome these type of defects. If you have any questions, we would be happy to test your containers in our lab and offer an opinion as to whether you will have any sealing problems.
QUOTE ( @ 2009-06-01)
Are there specific considerations when sealing to glass?
Generally, you can seal dry products, or products with a low percentage of water, such as edible oils, in glass containers. Check with your innerseal or cap company for their recommendation concerning the correct foil innerseal.
QUOTE ( @ 2009-06-01)
Can you talk about induction sealing fluorine treated bottles
If the fluorine treatment is on the lip of the container, it makes it more difficult to get a good induction seal. This is also true of flame treating. If the lip of the container is flame treated, it takes an inordinate amount of power to achieve a strong seal.
