Quality appraisal of hemp strip machine

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linen strip making machine uses roller carding and fiber orientation as its core principles. It processes hemp fiber into continuous and uniform fiber strips through processes such as opening, carding, and drafting. It is widely used in the pretreatment of linen, ramie and other hemp textile raw materials. In the textile industry, it undertakes the task of fiber carding before flax spinning; in the field of special materials, it realizes the preparation of high-performance fibers such as carbon fiber into strips; in the environmental protection industry, it processes waste textiles and carding regenerated fibers into strips. Compared with cotton spinning machines, hemp spinning machines have the characteristics of high wear resistance, strong adaptability, and low damage rate, and are key equipment in the hemp textile industry chain.

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

With the high-end development of hemp textiles, the number of quality disputes involving hemp strip making machines has gradually increased. The judicial dispute focuses on:

1, performance index dispute: whether the fiber strip weight unevenness meets the standard, and whether the fiber straightness meets the design value;

2, material and process defects: the card clothing material has insufficient wear resistance, Luo The drawing surface treatment process is not up to standard, resulting in fiber entanglement;

3. Control system failure: the drafting multiple control accuracy is out of tolerance and the auto-levelling function fails;

4. Contract performance issues: the delivered equipment does not match the technical agreement.

0In such cases, the quality appraisal of the hemp strip machine needs to combine fiber quality testing, mechanical performance testing and process analysis to provide technical support for the court to determine the attribution of liability.

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The quality identification technical methods of the hemp strip machine include:

1. Product appearance inspection: Check whether the overall appearance of the hemp strip machine, including size, color, surface treatment, etc., meets the requirements.

2. Performance test: Test whether the processing capacity, strip quality, production efficiency and other performance indicators of the hemp strip making machine meet the contract agreement or industry standards.

3. Structural analysis: Analyze whether the structural design of the hemp strip making machine is reasonable and whether there are defects that affect performance.

4. Material testing: Test the materials of key components of the hemp strip machine, such as rollers, guides, etc., to see if they meet the requirements.

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The applicant, a linen textile company, and the respondent, a textile machinery company, signed a "Purchase Contract for Linen Strip Making Machines", agreeing to purchase 5 sets of MC-1200 strip making machines. After being put into production, the fiber weight unevenness reached ±3%, resulting in a spinning end breakage rate of over 30%. The textile company believed that the equipment had quality defects and demanded compensation for losses. The machinery company argued that the problem was caused by differences in fiber raw materials, and the two parties went to court.

Identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of the "hemp strip machine", contract technical agreement, on-site investigation case materials and other data, and made the following quality analysis opinions:

The card clothing material of the hemp strip machine involved in the case is ordinary carbon steel (the contract requires high carbon alloy steel), and the C content is only 0.4%, insufficient wear resistance; the thickness of the chromium plating layer on the roller surface is only 5μm (standard ≥10μm), resulting in fiber entanglement. The roller parallelism deviation exceeds 0.1mm, and the fiber holding force is uneven; the autoleveling system is not calibrated according to the standard, and the feed volume fluctuates by more than ±10%.

The machinery company did not provide the specified material card clothing and rollers according to the contract, and the process parameter control was not up to standard, which was the main reason for the equipment problems.

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Hemp strip making machine quality appraisal report should include the following content:

1. The purpose and basis of the appraisal.

2. Model, specification, manufacturer and other information of the equipment being identified.

3. Identification method.

4. Identification results (including whether there are quality problems, causes of problems, etc.).

05. Identification conclusion.

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26. Signature and seal of the appraiser, and official seal of the appraisal institution.

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