Application Specifications for Optimum Performance of Maverick PVC Capsules

For application by heat tunnel
First, ensure the track and guide plates will position the bottle such that it is centered within the tunnel. Without proper centering, the capsule will be subject to more heat on one side of the capsule, resulting in an uneven shrinkdown. Second, position the height of the heat tunnel such that the capsule begins shrinking near the bead of the bottle first, then down through the body. This will help to prevent the capsule from rising up during shrinkdown, a defect known as “top-hatting”. Additionally, it is important to have the bottles rotate as they begin to be subjected to the heat. Rotating the bottles allows for even distribution of the heat resulting in a more even shrinkdown. Generally, 3-foot long heat tunnels will accommodate bottling speeds up to 200 bottles per minute at the appropriate settings.

For application by heat head
First, ensure the bottle is centered while entering the heat head. Second, ensure the bottle enters and exits the head at a consistent rate. Bottles should not shift from side to side as they travel the circumference of the heat head unit. A purge air system is highly recommended to ensure even application and distribution of the heat.

General Recommendations
Heat settings: When choosing your heat setting, keep in mind that darker color capsules require less heat to achieve optimum shrinkdown. Conversely, more metallic or brighter colors require more heat. The easiest method for determining temperature settings is to begin at a low temperature and work your way up to the point the capsule is just beginning to shrink. Document this temperature setting. Then, bring the temperature up to the point the capsule is beginning to show signs of pull back or separation at the glue seam. Document this setting and then determine the mean temperature. This should be your average run temperature setting.

Heat Application: Heat should be applied to the capsule as evenly as possible; bottles should rotate entering the heat tunnel or a purge air system should be used on heat heads. Heating elements of either unit should not be directly exposed to the capsule.

Dwell time: The amount of time required to achieve optimum shrinkdown will vary greatly by the size of the capsule/bottle, capsule color, bottle temperature, line speed, and desired shrinkdown quality. Each operation will find its settings to be unique to its operating environment, equipment and capsule color(s).

Please contact Fred Koeppel, Technical Sales Manager, +1 (707) 234-6118, for assistance in dialing in equipment.