Case Study: Improved Material Flow in Plastic Injection Molding Machine

Situation

A plastic injection molding company relied on the continuous, reliable flow of thermoplastic pellets at the feed throat of their injection molding machine to maintain efficient production cycles. Consistent material delivery was essential to avoid interruptions and ensure high-quality molded products.

Problem

The company encountered frequent material flow issues at the feed throat. Thermoplastic pellets would sometimes bridge or rathole, starving the machine and causing cycle interruptions. To restore flow, operators had to stop production and manually agitate the hopper or poke the material through, disrupting workflow and increasing costly downtime. Installing a full-size industrial vibrator was not an option due to space constraints and concerns that excessive vibration force could damage the machine or throat assembly.

Solution

To resolve these challenges, the company installed a MARTIN® NTP 18 Miniature Air Vibrator from the Bantam™ Series directly onto the feed throat. This compact, continuously impacting linear vibrator delivers just enough energy to break up minor bridging and maintain steady pellet flow — without overstressing sensitive equipment. Its low air consumption and small footprint made it ideal for the tight space available at the feed area.
This resulted in:

• Smooth, reliable pellet flow with fewer cycle delays
• No need for operators to manually agitate the hopper
• Gentle vibration that won’t damage equipment
• Compact design installs easily without system changes

By implementing the NTP 18 miniature air vibrator, the company eliminated a persistent material flow bottleneck, enhanced process reliability, and protected machine integrity—resulting in more efficient and dependable injection molding operations.