Quality appraisal of down washing machine

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down washer-extractor takes the synergy of efficient washing and gentle dehydration as its core principle. By optimizing the drum speed control, water temperature accuracy and automatic detergent proportioning system, it achieves the synergy of down cleanliness, bulkiness retention rate and energy consumption control. It is widely used in the industrial cleaning field of down jackets, duvets and bedding products. In the home textile manufacturing industry, it is used for low-temperature gentle washing of high-loft down. In the clothing field, it meets the deep cleaning needs of anti-drilling fabrics. In high-end washing services, it ensures no damage to luxury down products. Compared with ordinary washing machines, down washing and drying machines have features such as anti-tangle design, high water recycling rate and intelligent sensing system. They are the core equipment for cleaning and care of down products.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide quality appraisal services for down washers and dryers. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for the quality appraisal of down washers and dryers.

With the trend of high-end down products, related quality dispute cases have increased significantly. The focus of judicial disputes is:

1. Disputes over performance indicators: Down grease residue exceeds the standard (such as agreement ≤0.3%, actual measurement ≥1%), moisture content after dehydration does not meet standards (such as agreement ≤30%, actual measurement ≥45%);

2. Material defects: Insufficient Cr/Ni content in stainless steel in the inner cylinder (such as 304 requires Cr ≥ 18%, Ni ≥ 8%), the sealing ring has poor temperature resistance (compression deformation after aging at 80°C > 20%);

3, process problems: speed control imbalance leads to down entanglement damage (breakage rate ≥5%), detergent mixing ratio deviation > ±10%;

4, contract performance dispute: core modules (such as variable frequency drive system, turbidity sensor) are inconsistent with the technical agreement.

0 Such cases need to pass washing effect verification, material failure analysis and dynamic operation testing to clarify the quality responsibility.

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The quality appraisal of down washing and drying machines should be carried out in accordance with national standards or industry standards. The main technical methods include:

1. Appearance inspection: Check whether the equipment shell, components, and electrical systems are deformed, damaged, rusted, and other defects.

2. Functional test: simulate actual usage conditions and test whether the washing, dehydration, temperature control and other functions of the equipment are normal.

3. Performance testing: Use professional instruments to test the washing rate, dehydration rate, energy consumption and other performance indicators of the equipment.

4. Material analysis: Conduct material composition analysis on key components of the equipment to ensure compliance with design requirements.

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A home textile factory of the applicant signed a "Purchase Contract for a Fully Automatic Down Washer and Extractor" with an equipment manufacturer of the respondent, and it was agreed that the grease residue should be ≤0.3%. During production, down was found to be agglomerated with 1.2% residue. The manufacturer argued that the operator did not add detergent in proportion.

Identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information, contract technical agreement, on-site inspection case materials and other data of the "Down Washer and Extractor" and made the following Quality analysis opinion:

The down washing and drying machine involved in the case had a washing temperature control deviation of ±8°C (agreed ±2°C), resulting in insufficient grease dissolution; the proportion of the mixing valve was out of control, and the detergent dosage fluctuated by ±15% (agreed ±3%); the design of the inner cylinder lifting ribs was defective, and the down winding rate was 8%.

The appraisal conclusion determined that defects in the temperature control system and mechanical structure were the main causes of excessive residue.

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Down washer-extractor quality appraisal report should include:

1, appraisal purpose (such as washing failure attribution, performance verification) and reference standards;

2, involved equipment model, control system version, production record;

3, detection method and equipment list (such as Soxhlet extraction device, moisture content meter);

4, correlation analysis of test data and failure (such as the impact of temperature deviation on grease residue);

05, clarify the quality responsibility judgment conclusion and technical basis;

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26, signature of the appraiser, textile machinery professional qualification certificate and official seal of the organization.

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