Shenhua Printing: Ejection Rubber Requirements for Different Die Cutting Processes

Die cutting is a versatile process used in many industries, and different die cutting processes have unique characteristics that place specific demands on ejection rubber Using the wrong type of ejection rubber for a particular process can lead to poor cut quality, frequent downtime, and increased costs. Shenhua Printing has extensive experience working with various die cutting processes and provides guidance on selecting the right ejection rubber for each application.

Flatbed die cutting is the most common process, used for cutting a wide range of materials from paper to plastic. For standard flatbed die cutting at speeds up to 80 strokes per minute, general-purpose ejection rubber with a hardness of 40-60 Shore A is suitable. However, for heavy-duty flatbed die cutting of thick corrugated board or rigid plastics, high-hardness ejection rubber (65-85 Shore A) with excellent compression resistance is required to withstand the high cutting forces.

Rotary die cutting operates at much higher speeds, typically 100-300 meters per minute, and places greater demands on ejection rubber's rebound speed and heat resistance. At these high speeds, the rubber must rebound instantly to keep up with the rotating die. Additionally, the repeated rapid compression generates significant heat, which can cause ordinary rubber to harden and degrade quickly. Shenhua Printing's high-speed rotary ejection rubber is specially formulated with a heat-resistant polymer blend that provides fast rebound and excellent thermal stability, ensuring reliable performance even at the highest speeds.

High-speed die cutting for labels and flexible packaging requires ultra-thin, high-precision ejection rubber. The ejection rubber for these applications must have extremely tight thickness tolerances (±0.03mm) to ensure uniform pressure distribution across the die. Any thickness variation can result in uneven cutting and label defects. Shenhua Printing's ultra-thin ejection rubber is available in thicknesses from 0.2mm to 1mm and is precision manufactured to meet the strictest dimensional requirements.

Laser die cutting is a relatively new process that uses a laser beam to cut materials. While laser cutting does not require physical blades, ejection rubber is still needed to hold the material in place and eject the finished parts. For laser die cutting, ejection rubber must be resistant to heat and laser radiation to prevent burning and melting. Shenhua Printing offers laser-compatible ejection rubber that can withstand the high temperatures generated by laser cutting without degrading.