What Is a Chuck?
A bottle capping chuck is a tool that is attached to a capping machine that enables the capping machine to grip a cap. The grip generated by the chuck with an inserted liner is what allows the capping machine to tighten a cap onto a bottle.
Since the chuck plays an essential and important role in the capping process, it is important that you choose the correct size and type of chuck to tighten your cap.
Choose the Right Chuck For Your Cap and Your Task
Since caps come in many different sizes and shapes, chucks do as well. Some chucks are better suited for certain tasks than others. We offer four different types of chucks, Standard Chucks, Deepwell Chucks, Machined Chucks and Cap Retaining Chucks. A detailed description of each type is below. Please read the descriptions to determine which type of chuck is best for you.
Standard chucks are by far the most common type of chuck. They are a good choice for most cap tightening applications.
A standard chuck is an aluminum shell, or cup. A soft urethane or white rubber liner is pressed into the chuck by hand, creating a tight fit between the chuck and liner.
During the capping process, the liner contacts the cap and creates the grip with the cap. The capping machine uses the grip generated by the liner to tighten the cap onto the bottle.
The role of the chuck is to create a rigid support for the soft and pliable liner while also serving as the means to connect the liner to the capping machine.
Our standard chucks come in 16 sizes to fit caps ranging from 10mm - 130mm in diameter. Each chuck size will work with a particular cap range. It may be necessary to purchase additional chucks if you will be tightening multiple cap sizes.
The Chuck & Liner Selection Chart contains a full listing of all of our chucks and liners sorted by cap size in ascending order.
Deep Well Chucks
Are the same as standard chucks except they have a secondary cavity that allows them to tighten caps with external features such as sports caps, mist spray caps, yorker caps, dropper caps, and many more.
Deep well chucks provide excellent flexibility as they tighten standard flat caps as well as they tighten caps with external features.
Our deep well chucks come in five sizes to fit caps ranging from 14mm - 37mm in diameter. Each chuck size will work with a particular cap range. It may be necessary to purchase additional chucks if you will be tightening multiple cap sizes.
The third column in the Chuck & Liner Selection Chart displays a list of deep well chucks sorted by cap size in ascending order.
Machined chucks are custom made to fit the rib pattern of a particular cap. They fit the cap in the same way as a socket fits a nut. Machined chucks provide extreme gripping power that make them very useful for certain types of challenging jobs, a few of which are described below.
The vast majority of de-capping jobs require a machined chuck. In most cases a standard chuck with urethane or rubber liner cannot provide enough gripping power to remove a tight cap. Generally what occurs is that the liner simply skids over the cap without removing it.
Machined chucks grip a cap so perfectly that it makes the removal of even the tightest of caps very easy.
- Extreme Torque Applications
When a cap has to be applied with an unusual or extreme level of tightness, a machined chuck is the perfect solution. A machined chuck can always apply as much torque as is necessary and will do so quite easily. Machined chucks also improve torque accuracy and never have to be replaced.
The urethane or white rubber inserts within a standard chuck will wear slowly over time and can occasionally leave very small amounts of urethane or white rubber particles on the caps they tighten. These particles may not be allowed in certain clean, sterile or controlled environments.
Machined chucks are ideal for clean environments since they do not wear and do not create particles. Machined chucks also improve torque accuracy and never have to be replaced.
Cap Retaining Chucks
A cap retaining chuck is a machined chuck that is designed with additional features that allow it to grasp and retain the cap it is designed to work with. Below are a couple of examples of applications in which they are useful.
- De-cap and Re-cap Operations
When decapping a container using a cap retaining chuck, the cap remains in the chuck after it has been removed from the container. This makes it ideal for use when you want to reapply the cap that has been removed.
- Pick & Place Operations
Cap retaining chucks can be used to pick up a cap, hold it, and then tighten it onto a container. For this reason they are ideal for use with automated capping machines and automated robotic capping systems.