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APC closures can be installed on pail covers by manual or automated processes. Our simple, rugged tooling enables start-up manual installation while our partners can facilitate fully automatic production.

Lock Ring Closures

Installation Method

APC-1 and APC-2 series closures use a tight interference fit plus an outer lock ring to secure the closure to the pail cover after it is molded. Once the cover opening is aligned over the closure, installation is completed in one fluid step with two distinct stages:

  1. The top press forces the beaded rim of the pail cover into the channel of the flexible body skirt, while the bottom air piston pushes up against the closure cap.
  2. The greater force of the top press pushes down the bottom air piston. The plastic cap lock ring breaks away from the cap bails and is pushed into place around the flexible body skirt.

This unique two-stage installation reduces force on the beaded rim, allowing installation on warm molded covers.


Manual Installation Press

Manual installation presses for APC-1 and APC-2 closures are available for purchase from APC Products Ltd.

With the addition of adapter plates, these presses may also be used for the APC-3 and APC-4L.

Please contact us for more details or to place an order.


Automatic Installation

Martin Automated Systems has created automatic installation lid lines for APC-2 and APC-6. These systems can significantly speed the installation process and reduce labour costs.

For more information, please visit


Insert Molded Closures

Installation Method

APC-7 insert molded closures use a plastic-to-plastic bond to secure the closure to the pail cover. The closures are loaded into the cover mold just before injection molding takes place. Installation steps include:

  1. Closures are placed in a hopper and oriented and elevated to the pick-up point
  2. Robotic end-of-arm tooling grips the closure cap by suction and positions the closure in the mold
  3. The robot retracts and the mold closes, clamping the closure for molding
  4. Plastic for the cover is injected into the mold and flows around the body skirt of the closure

The plastic-to-plastic bond that is formed through this process gives a leak-proof seal that is impossible to break without detection.


Automatic Installation

APC-7 insert molded closures must be installed through an automated process. They have been successfully integrated into 1 and 2 cavity molds as well as 4 cavity stack molds. There are three key steps for successful automatic installation:

  1. Make cover mold inserts
    APC-7 insert molding can be built, tested and run by retrofitting an existing cover mold with custom machined core and cavity inserts. These inserts are low maintenance as there are no moving parts to wear, and they can be turned on a lathe, as there is no requirement for ovality. Where possible, inserts are easier to fit into a new mold at the design stage. Drawings are available from APC Products Ltd. and we can refer you to a toolmaker with knowledge of the APC-7.
  2. Automate closure orientation and elevation
    APC-7 closure orientation for a single and double cavity mold can be fed by a simple hopper and a near vertical elevator with ribs. In our video of an APC-7 demonstration cell, the elevator is supplied by Martin Automated Systems. For further details, see
  3. Install robots and end-of-arm tooling
    APC-7 insert molding can be tested and run on a single cavity mold by running the press in a semi-automatic cycle. Insert molding on multiple cavity molds requires a three-axis robot to carry parts from the feeder to the mold. The robot needs to be sized to match the mold and molding machine. Pail molders should choose a local robot supplier that they are familiar with.

For more information about tooling inserts and automation, please contact us.

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