Two Color Toothbrush Handle Mold – 12+12 Cavity Case Study

12+12 Cavity Two Color Toothbrush Handle Mold Case Study

Two color toothbrush handles combine rigid plastic with soft-touch materials to improve comfort and product appearance.

For high-cavity production, maintaining accurate positioning between the first and second injection stages is essential.

Focare Mould developed a 12+12 cavity two color toothbrush handle mold using PETG and TPE materials.

For this project, we recommend a dedicated two color rotary shaft injection molding machine to support stable and consistent production.

1. Mold Specifications

Product: Two Color Toothbrush Handle
Material: PETG + TPE
Cavity: 12+12 Cavities
Mold Steel: German S420
Hot Runner: YUDO 24-Tip Valve Gate
Mold Size: 558 × 711 × 572 mm
Mold Weight: 1,718 kg
Injection Machine: 250T Two Color Rotary Shaft Machine
Mold Manufacturer: Focare Mould

2. Why Use a Rotary Shaft Injection Molding Machine?

For high-volume two color toothbrush production, machine selection directly affects manufacturing stability.

Unlike production using two separate injection molding machines, a rotary shaft system integrates both injection stages into one controlled process.

❶ Accurate Positioning

The rotary shaft mechanism transfers the first-shot component to the second injection position.

This helps maintain consistent alignment between PETG and TPE, reducing the risk of flash and material misalignment.

❷ Stable Production

Using two separate machines requires transferring first-shot components between molding operations.

Variations in transfer time, positioning, and temperature can affect production consistency.

A dedicated rotary shaft machine reduces these variables and supports more repeatable production.

❸ Higher Production Efficiency

The 12+12 cavity configuration is designed to produce 12 finished toothbrush handles per cycle once production reaches steady-state operation.

An integrated two color molding process also reduces intermediate handling and supports automated production.

3. Key Mold Design Features

❶ PETG + TPE Overmolding

PETG forms the rigid toothbrush handle, while TPE provides the soft-touch grip.

Proper material compatibility, mold design, and injection parameters are important for reliable bonding.

❷ YUDO 24-Tip Valve Gate System

The mold uses a YUDO 24-tip valve gate hot runner system to support controlled material delivery across multiple cavities.

Balanced filling is important for maintaining consistent product quality.

❸ Precision Mold Alignment

High-cavity two color molding requires accurate alignment between both injection stages.

The mold structure must work together with the rotary shaft mechanism to maintain positioning accuracy.

4. Focare Mould's Recommendation

For this 12+12 cavity toothbrush handle project, Focare Mould recommends using a dedicated rotary shaft two color injection molding machine rather than two separate injection machines.

This solution provides better control over part positioning, transfer timing, and the overall molding sequence.

For manufacturers planning long-term toothbrush production, the combination of a properly designed mold and compatible injection machine is essential for stable manufacturing.

5. Custom Two Color Toothbrush Mold Manufacturer

Focare Mould specializes in custom plastic injection molds, including high-cavity toothbrush molds and two color injection molding solutions.

Our engineering team supports mold design, material evaluation, hot runner integration, mold manufacturing, and trial production.

Looking for a reliable plastic injection mold maker in China?

Contact Focare Mould to discuss your toothbrush handle mold requirements.