Compression Injection Molding Process

The injection compression molding process is a hybrid technique that combines injection molding and compression molding. Its core process involves “injection followed by compaction”—melted material is injected into the pre-cavity of a mold that is not yet fully closed, after which the moving mold plate rapidly closes the mold a second time. The material is then forced to fill the cavity through compression, simultaneously eliminating internal stresses and significantly reducing defects commonly found in standard injection molding. Compared to conventional injection molding, this process results in lower equipment wear and tear, with injection pressure reduced by approximately 30%. Costs are more controllable, as there is no need to accommodate high injection pressures, simplifying mold design for complex products.

Shorter Cycle Times and Higher Product Yield

Cycle times reduced by 25%–50% (depending on structure and material).
Product yield increased by 20%–40%.

Dimensional accuracy and stability (eliminates sink marks and warping)

Internal stress is significantly reduced (no uneven holding pressure), and stress concentration is markedly reduced.
Improved light transmission.

Application Case

Repeat Order Special Successfully Delivers Turnkey Plant Solution

As the largest mold manufacturing and product processing base in Hebei Province, the customer specializes in R&D and design of molds for four major sectors: high-end automotive interior and exterior parts, home appliances, daily necessities, and toys. It is a tier-1 supplier to Midea and Great Wall Motors, operating an integrated molding and plastics factory covering mold manufacturing, injection molding, spraying, and component assembly.

Customer Success Story Empowers the Nail Art Industry with Multi-color Nail Tip Technology Upgrade

Based in Laoling, Shandong Province, this plastic product manufacturer has carved out a strong foothold in the specialized segment of beauty plastic products, with a core focus on nail tip production. By partnering with TUP to deploy a professional injection molding production system, the company has driven process iteration and upgrading through technological collaboration, achieving three key breakthroughs simultaneously—energy conservation, cost reduction, and efficiency improvement—and thus enhancing its core competitiveness in the market.

Customer Story | Cost Reduction & Efficiency Improvement: Customer Endorsement for TUP 's All-Electric Injection Molding Machines

Focus on Application Demands of Thin-Wall PackagingThe Fierce Competition for Every Millimeter in Speed and Precision@TUP Build a Definitive Answerfor Efficient, Energy-Saving and Stable Production.

Customer Story | A Simple ''Great'' – The Sincere Recognition for TUP Injection Molding Machines

Recently, after successfully concluding the Qingdao Rubber & Plastic Exhibition, the team from TUP’s Marketing Department was privileged to visit the cleanroom of a valued customer in Qingdao – and found themselves "immersed" in the customer’s repeated praise of "great" for TUP’s equipment.

The Path to Intelligent Manufacturing Success: Yili and TUP

Yili Group entered the cleaning industry in 1985, primarily engaged in the R&D, production, and marketing of diversified cleaning products such as high-pressure washers, vacuum cleaners, sprayers, and steam cleaners. The group owns several brands including "Yili," "Aizhuren," and "YILIGARDEN." Its manufacturing bases are located in Jiashan, Zhejiang; Nanyang, Henan, China; and Haiphong, Vietnam. Among these, Yili Electromechanical operates a 13,500 m² production base in Jiashan, housing over 140 injection molding machines in its injection molding workshop.