Category: Engineering
3/30/2009
David Messing

There are many defects that can arise when putting a package together for a customer. One that we see fairly often is closure cocking on the bottle when applied during production. This presents the possibility of two potential problems with the package for the customer.

First, the cocking of the closure could create a situation where the sealing system is rendered non-functional, thus causing a leak. This is a critical defect and needs to be addressed immediately to prevent defective ware from reaching the shelves. Sealing systems such as liners, V seals, crab claws and even plugs can be adversely affected by this defect.

Second, the closure’s appearance on the package has now been affected. The cocking has caused a visual defect (aesthetic look) that the customer and consumer can readily see. The combination of these two problems resulting from closure cocking can lead to lost time of production, rejections, etc.

There are several possible causes for the closure to become cocked on the bottle upon application torque. Here are few examples:

1. The bottle H dimension displays slant causing the closure to follow the slant upon becoming seated on the land.
2. The bottle T dimension and E dimension are running out of spec on the low side, causing either cross threading resulting in closure cocking or creating too much gap between the closure and bottle thread profiles creating the slanted look to the closure.
3. The closure T and E dimensions being too large cause the same result as #2 above. This occurs in some cases where the closure is not made to Closure Manufacturers Association standards for closures and is made larger for molding purposes.
4. The bottle thread pitch does not match the closure thread pitch, causing cross threading resulting in closure cocking.

So as you can see there are multiple reasons for this problem to occur in packaging. Determining what the root problem is will lead you to the corrective action specifically needed to get the package back on track.

Category: Engineering
3/30/2009
David Messing

There are many defects that can arise when putting a package together for a customer. One that we see fairly often is closure cocking on the bottle when applied during production. This presents the possibility of two potential problems with the package for the customer.

First, the cocking of the closure could create a situation where the sealing system is rendered non-functional, thus causing a leak. This is a critical defect and needs to be addressed immediately to prevent defective ware from reaching the shelves. Sealing systems such as liners, V seals, crab claws and even plugs can be adversely affected by this defect.

Second, the closure’s appearance on the package has now been affected. The cocking has caused a visual defect (aesthetic look) that the customer and consumer can readily see. The combination of these two problems resulting from closure cocking can lead to lost time of production, rejections, etc.

There are several possible causes for the closure to become cocked on the bottle upon application torque. Here are few examples:

1. The bottle H dimension displays slant causing the closure to follow the slant upon becoming seated on the land.
2. The bottle T dimension and E dimension are running out of spec on the low side, causing either cross threading resulting in closure cocking or creating too much gap between the closure and bottle thread profiles creating the slanted look to the closure.
3. The closure T and E dimensions being too large cause the same result as #2 above. This occurs in some cases where the closure is not made to Closure Manufacturers Association standards for closures and is made larger for molding purposes.
4. The bottle thread pitch does not match the closure thread pitch, causing cross threading resulting in closure cocking.

So as you can see there are multiple reasons for this problem to occur in packaging. Determining what the root problem is will lead you to the corrective action specifically needed to get the package back on track.