The SRZ‑400A Automatic Melt Index Tester (Melt Flow Rate Tester) complies with GB/T 3682‑2018, ISO 1133‑2005 and ASTM D1238 standards. It is used to determine the melt‑flow rate (MFR) and melt‑volume‑flow rate (MVR) of thermoplastics, reflecting the flowability of resin melts. It is widely applied in plastic‑manufacturing factories producing melt‑blown materials, non‑woven fabric PP, PE, PS, ABS, nylon, PC, fluoroplastics and so on. It provides critical data support for incoming‑material inspection, production‑process control, formula development, recycled‑material management, finished‑product release and customer compliance audit.

1. Incoming Raw‑material Inspection and Batch‑quality Control

Conduct melt‑index tests on newly‑delivered resin and pellet raw materials, verify melt‑flow‑rate indicators and identify quality differences between batches of materials with the same grade. Even for plastics of an identical grade, polymerization fluctuations may lead to changes in flowability. Unqualified incoming materials can be rapidly identified to prevent raw materials with abnormal flowability from being directly put into extrusion, injection‑molding or spinning production, thus avoiding batch product rejection. It can detect wrong or mixed materials, assist quick verification of raw‑material grades and prevent mis‑feeding of materials into production equipment. It is especially suitable for raw‑material acceptance of melt‑blown polypropylene and spun‑bond non‑woven PP used in epidemic‑prevention and sanitary‑care materials.

2. On‑line Quality Monitoring in Production Process

Carry out regular sampling inspection of pellet MFR/MVR during modified granulation and masterbatch production to monitor the stability of production processes. Fluctuations in temperature or screw speed may cause degradation or cross‑linking of molecular chains, accompanied by changes in melt index. Production‑line abnormalities can be detected in a timely manner according to test data, and processes can be adjusted in advance to reduce defective output. For injection‑molding, extrusion and non‑woven‑fabric manufacturers, finished pellets shall be sampled periodically to monitor flow‑property changes of materials after heating and shearing inside processing equipment.

3. Formula R&D and New‑material Commissioning

When developing modified plastics, fillers, blends and color masterbatches, test the melt index under different proportions of fillers and additives, evaluate the influence of formulas on melt flowability, screen out appropriate formulas efficiently, reduce machine‑based trial tests and save raw‑material costs and time. For special‑purpose materials such as melt‑blown materials, precisely control MFR indicators (the typical MFR of melt‑blown PP is around 1500 g/10 min) to ensure stable production of ultra‑fine fibers in the subsequent spinning process.

4. Quality Control of Recycled / Regenerated Materials

Plastic recycling and granulation factories test the melt index of recycled materials: repeated thermal processing of plastics will cause molecular‑chain degradation and a significant rise in MFR. The degradation degree can be judged via melt‑index tests to guide the mixing ratio of recycled materials and guarantee stable flowability of blended materials. Classify recycled materials of different sources by quality grades for graded and targeted application.

5. Defect Analysis and Fault‑assisted Troubleshooting

When product defects occur in factories, such as short shots or flash in injection‑molded parts, uneven fiber thickness or filament breakage of non‑woven fabrics, and unstable extrusion output, perform a melt‑index comparison between qualified and defective materials. It helps judge whether defects are caused by raw‑material flow‑rate fluctuations, distinguish raw‑material faults from equipment‑process faults and shorten fault‑diagnosis time. Note: The melt index is an indicator measured under a single fixed‑shear condition, suitable for rapid screening. For complete rheological data under high‑shear conditions, a capillary rheometer or torque rheometer shall be additionally equipped.

6. Finished‑product Delivery, Customer Audit and Technical Documentation

Generate standardized MFR and MVR test reports complying with national and international standards for finished‑product release. Provide compliant test data for downstream‑customer incoming‑material audits and third‑party testing. The instrument supports data export via USB flash drive and report printing, enabling factories to build a raw‑material‑to‑finished‑product database. Historical reference data can be retrieved during grade‑switching production.

7. Cost‑reduction and Efficiency‑improvement Summary

• Block unqualified incoming materials: screen out raw materials with abnormal flowability before feeding and avoid heavy losses from mass‑production failures.
• Shorten R&D commissioning cycles: quickly evaluate melt flowability at the formula stage and reduce waste from production‑line trials.
• Stabilize production‑line quality: monitor material flow properties during production and give early warnings against process drift.
• Boost efficient utilization of recycled materials: scientifically guide the addition proportion of recycled materials and improve waste‑material utilization rates.
• Meet compliance‑delivery requirements: standardized test reports satisfy customer and third‑party audit demands.

Applicable Factories: Modified‑plastic manufacturers, PP melt‑blown‑material / non‑woven‑fabric raw‑material producers, masterbatch factories, injection‑molding plants, extrusion‑product manufacturers, recycled‑plastic granulation factories, engineering‑plastic producers (nylon, PC, ABS, etc.), and high‑polymer‑material enterprises for medical and sanitary‑care applications.

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