The MLW‑400D Computer‑Controlled Capillary Rheometer is mainly used to test the melt rheological properties of plastics, polymers and rubber‑like materials. It provides data support for factories in incoming raw‑material inspection, formula R&D, production‑process debugging, finished‑product quality control, fault analysis and other links. The specific functions are as follows:

I. Incoming Raw‑Material Quality Control

1. Test the melt fluidity and apparent viscosity of raw materials in accordance with ISO 11443 and HG/T 4300‑2012 standards to judge the qualification of raw‑material batches. Even for raw materials of the same grade, rheological properties may vary from batch to batch. Rheological tests screen out unqualified incoming materials to prevent sub‑standard raw materials from being put into production and reduce batch‑scrapping losses.
2. Distinguish the flow characteristics of different‑grade raw materials to facilitate grade verification and avoid mixing‑up of wrong materials.

II. Formula R&D and New‑Material Development

1. When developing formulas for modified plastics, blended materials and rubber, test the shear viscosity and shear stress of materials under different formulas, compare the melt flow capacity of different ratios, quickly screen optimal formulas, reduce trial‑production runs and save raw‑material and time costs.
2. Perform step‑shear and flow‑no‑flow tests to determine the minimum flow temperature of materials, study melt fracture and flow‑instability phenomena, evaluate the processability of new materials, and predict their adaptability to in‑house extrusion and injection‑molding processes.

III. Optimization Guidance for Production‑Process Parameters

1. The instrument simulates shear‑rate and temperature conditions during injection molding and extrusion, and obtains viscosity data of materials under varying temperatures and shear conditions. Factories can use such data to set processing temperature, screw speed, pressure and other parameters for injection‑molding and extruder machines, cutting trial‑run and debugging costs.
2. Compare rheological curves under different process conditions for the same material to identify suitable processing windows, stabilize production and minimize processing defects such as short shots, flash, silver streaks and melt fracture.

IV. In‑Production Quality Monitoring and Finished‑Product Root‑Cause Analysis

1. Periodically sample‑test rheological performance during production to monitor material aging and degradation. For instance, repeated plastic recycling and granulation cause molecular‑chain degradation and viscosity changes. Rheological data directly reflect degradation levels and guide recycling‑material addition ratios.
2. Conduct reverse analysis when product defects occur: compare rheological curves of qualified and defective materials to identify whether defects stem from raw‑material fluctuation, material degradation or process issues, enabling fast fault localization.

V. Product Compliance, External Testing and Technical Documentation

1. For third‑party testing and customer audits, the equipment generates test reports and curve data compliant with national and international standards for factory‑inspection documents, meeting customer technical‑audit and product‑compliance certification requirements.
2. Facilitate internal technical‑document accumulation. Establish a database of rheological parameters for various materials. Historical data can be directly retrieved for product‑grade change‑overs, shortening commissioning cycles.

VI. Summary of Cost‑Reduction and Efficiency‑Improvement Values

1. Reduce waste: Identify poor‑quality raw materials and unsuitable formulas in advance to avoid waste generated by machine‑on trial production.
2. Shorten R&D cycles: Screen formulas via instrument testing instead of repeated physical machine sampling.
3. Stabilize product quality: Control raw‑materials and processes to lower defective‑product rates.
4. Enhance in‑house technical capability: Master internal rheological‑property data instead of fully relying on raw‑material suppliers, and independently control processing technologies.

Applicable factory types: modified‑plastic manufacturers, plastic injection‑molding & extrusion processors, rubber‑product manufacturers, polymer‑material enterprises.

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