Analysis on Key Evaluation Points of Injection Molding Factory Qualification

Selecting a reliable injection molding factory is critical to guarantee product quality, on-time delivery and stable cooperation. Factory qualification evaluation should not only check written certificates, but also conduct comprehensive assessment on hardware strength, management system, production capacity, quality control and supporting services. This article sorts out detailed evaluation points for risk avoidance and supplier selection.

1. Basic Certificates and Compliance Inspection

Verify business license first, confirm that the business scope includes plastic products and injection molding processing. Check the consistency of registered address, operating status and actual factory site. Factories with long operating years usually have stable supply chain and operation.

For products contacting food, medical devices and export goods, inspect special certificates respectively. Food-contact plastic parts require food-grade processing records and sanitary test reports. Medical accessories need relevant production filings and clean room qualifications. Export orders require customs filing and import & export operation certificates.

Environmental protection and fire safety documents are mandatory inspection items. Check pollutant discharge permits and environmental test reports, and confirm that waste gas, wastewater and plastic scraps are disposed in compliance with local regulations. Inspect fire acceptance certificates, equipment inspection records and emergency plans. Check fire protection configuration of workshops, heating equipment and warehouses.

In addition, special equipment such as injection molding machines, cooling towers, air compressors and cranes must have valid registration certificates, and operators must hold professional operation certificates.

2. Production Hardware and Equipment Strength Evaluation

Count the quantity, tonnage range, brand and service life of injection molding machines. Select equipment according to product size, weight and structural complexity. Small thin-walled parts match 80T–180T machines, while large parts use machines above 200T. All-electric injection molding machines are preferred for high-precision appearance parts due to higher control accuracy. The service life of main production machines is recommended to be within 10 years.

Check auxiliary equipment including dehumidifying dryers and mixing machines. Materials easy to absorb moisture must be processed with professional dehumidifying equipment. Inspect cooling water system and power supply system to ensure stable production parameters.

Evaluate independent mold workshop equipped with CNC machines, EDM machines and wire cutting machines. Factories with self-owned mold processing capacity can shorten maintenance cycle. Check workshop zoning: raw material area, production area, finished product area, defective product area and recycling area should be divided clearly.

3. Mold Management and Technical Capability Evaluation

Understand the factory’s experience in manufacturing conventional molds, two-color molds, insert molds and thin-wall precision molds to match product requirements. Check mold management ledgers, daily maintenance, rust prevention and dust prevention measures for idle molds. Record mold service times and maintenance history.

Inquire about the response speed of mold repair. Efficient troubleshooting can reduce production downtime. Evaluate the configuration of professional team including mold engineers, process engineers and operators. Check past production cases of similar products to assess capabilities in trial molding and defect correction. For new product development, evaluate the overall cooperation ability from mold design to mass production.

4. Quality Control System and Testing Capability

Check ISO9001 quality management system certificate and verify actual implementation status. A complete quality control process covers incoming material inspection, first article inspection, in-process patrol inspection and final delivery inspection. Raw materials are sampled to test material property, moisture content and color. First articles are fully inspected before mass production. Regular sampling is conducted during production, and finished products are inspected before delivery.

Inspect testing instruments. General measuring tools include calipers, micrometers, color difference meters and gloss meters. High-precision products require 2D measuring instruments, 3D coordinate measuring machines and mechanical property testers. Special testing equipment for waterproof and heat-resistant performance is checked for special products. Establish classification, traceability and rectification mechanism for defective products to form closed-loop management.

5. Production Capacity, Delivery and Warehouse & Logistics Capability

Calculate daily and monthly output of single machine and the whole factory, distinguish conventional production capacity and emergency capacity, and confirm reserved capacity space. Learn about production shifts and order scheduling rules, as well as solutions for urgent orders and delayed delivery.

Raw materials are stored in classified areas with moisture-proof and light-proof measures. Finished products are stacked properly to avoid extrusion and scratching. Appearance parts and precision parts are packaged with pearl cotton and anti-static bags. Confirm logistics channels, delivery time and transportation protection measures. Evaluate stocking capacity for long-term orders.

6. Personnel Management, On-site Management and Supporting Services

Understand staff division and turnover rate. High staff mobility will affect process execution and product stability. Check training records for operational specifications, quality standards and safety rules. Inspect 5S on-site management to judge operational standardization.

Confirm dedicated docking personnel, and assess response speed for quality complaints, mold modification and product update. For spraying, silk-screen printing, laser engraving and assembly processes, evaluate independent processing capacity or qualified outsourcing resources.

7. Comprehensive Evaluation on Cost and Cooperation Risk

Analyze detailed quotations including material cost, processing fee, mold cost, freight and tax. Be cautious of quotations far below industry average, which may imply hidden quality risks. Assess factory operating status, order saturation and customer groups to judge anti-risk capability.

Carry out small-batch trial production and periodic factory audit to verify actual strength. Determine final cooperation mode according to product positioning and order volume, and set up regular review mechanism for long-term cooperation.