Bottle Cap Injection Molding Machine

The Bottle Cap Injection Molding Machine is designed for high-volume production of plastic bottle caps and closures. It is suitable for continuous molding of beverage caps and other PP or HDPE closures.

Note: The listed shot weights are PS reference values. Actual material capacity for PP or HDPE should be evaluated according to the resin grade and production configuration.

Production output is normally calculated from the number of mold cavities and the cycle time.

Caps per hour = Number of cavities × 3600 ÷ Cycle time
This calculation provides a theoretical starting point for comparing a proposed mold configuration with the required production volume.

Cavity Count
Each molding cycle produces one set of parts from every cavity in the mold. The required cavity count can therefore be established from the target output and planned cycle time.
Cavity count is one of the main inputs for estimating output. The final production result also depends on the actual cycle time and molding configuration.

Cycle Time
The total cycle covers injection, holding, cooling, mold movement and ejection. Any reduction in cycle time must still leave sufficient time for the closure to fill, cool and release correctly.
Any quoted cycle time is meaningful only when the cap, mold and production conditions are defined.

The machine needs to be evaluated as part of the complete production setup, with the mold configuration and intended operating conditions taken into account.

Existing Mold Compatibility
An existing bottle cap mold can be evaluated against the selected machine before the order is finalized.
The review should confirm whether the mold can be installed and operated within the machine's available configuration. For an existing project, the mold drawing and technical data provide the most reliable basis for this check.

High-Cavity Mold Configuration
High-cavity bottle cap molds place greater demands on the overall molding system because multiple cavities must be filled and cooled consistently within each cycle.
The cavity arrangement, runner system and filling balance should be reviewed together with the intended production cycle.
A suitable machine provides the operating conditions required by the mold rather than being selected from cavity count alone.

Mold-to-Machine Matching
For a new mold project, the machine and mold should be considered together before the final configuration is confirmed.
This helps avoid selecting a machine first and discovering later that the intended mold configuration requires changes to the machine or production setup.

High-volume bottle cap molding requires repeatable injection and clamping movements throughout continuous cycles.

Injection Speed
Under the stated specifications, the three models provide maximum injection speeds of 401 mm/s, 434 mm/s and 458 mm/s respectively.
The working injection speed is determined by the resin, cap geometry, mold design and required filling profile.

Clamping Structure
The machine uses a high-rigidity clamping structure with mechanical direct-pressure locking.
With high-cavity closure molds, consistent mold movement helps maintain mold closure conditions and limit variation that could contribute to flash.

Mold Movement
Opening, closing and ejection contribute to the total cycle even though these movements do not directly form the cap.
Injection speed represents only one part of the cycle. Mold opening, closing and ejection also contribute to the final cycle time.

Finished closure quality reflects the combined performance of the machine, resin, mold and molding process.

A bottle cap production reference was completed using the following production configuration:

The reference demonstrates the production conditions achieved with a defined machine, cap and mold configuration. Actual output varies with cavity count, cycle time, cap design, material and operating schedule.

For a new bottle cap production project, provide:

This information provides the basis for selecting the appropriate machine configuration.