The following is a detailed description of the use of the raw silk fineness analyzer:
1、 Overview and core functions of the instrument
The raw silk fineness meter is a precision instrument that uses the fixed length weighing method to detect the uniformity of raw silk thickness. It mainly consists of a weighing system, a data processing system, and a display output module. Its core functions include measuring the fineness value of single strand raw silk, calculating the fineness distribution, calculating the average fineness, fineness deviation, and maximum deviation, and other quality indicators, providing data support for the optimization of silk reeling process and product quality control.
2、 Standardized operating procedures
-Preparation before operation
-Environmental adaptation: Ensure that the laboratory temperature is stable at 5-25 ℃, humidity is ≤ 80% RH, and avoid airflow disturbance and electromagnetic interference.
-Equipment self check: Before powering on, check the grounding reliability of the power cord and verify the insulation resistance with a megohmmeter to be ≥ 5M Ω; after turning on, observe the initialization status of the LCD screen and confirm the sealing of the windproof cover.
-Calibration of standard weights: According to JJF (Textile) 042-2020 standard, F2 grade weights are selected for three-point calibration (zero point, 50% range, full range), with special verification of the indication error of 1.25mg/2.5mg special weights.
-Sample processing and loading
-According to the GB/T 1798-2008 standard, take a 1.125m raw silk sample and wrap it neatly in the sampling frame to avoid cross compression or touching the edge of the scale.
-Select the reverse gear according to the specifications of the raw silk to be tested: for fine denier silk (<33D), the 400 loop mode is preferred to improve accuracy, while for coarse denier silk (>50D), 100 loop rapid screening can be used.
-Implementation of dynamic measurement
-Activate the 'Continuation Test' function to achieve continuous testing of multiple batches. When deleting invalid data, perform the 'Clear+Confirm' double key operation to prevent accidental deletion.
-Real time monitoring of the stability of the weighing curve. When the fluctuation amplitude exceeds ± 0.5D, the test should be stopped to investigate the sliding of the wire bundle or abnormal sensors.
3、 Key parameter setting skills
-Matching of number and range: The 400 loop mode corresponds to a total length of 450m and is suitable for high-precision quality inspection; 200 rounds of balancing efficiency and accuracy; 100 times for rapid sampling inspection on the production line.
-Threshold alarm configuration: Preset the upper limit of fiber deviation (such as ± 7D) on the touch interface, and automatically trigger sound and light warnings and mark abnormal data groups when exceeding the limit.
4、 Data processing and report generation
-Statistical analysis model: Based on the GB/T 1798-2008 algorithm, automatically calculate three core indicators - fineness deviation, average fineness, and maximum deviation.
-Visual output scheme: supports three report formats: trend chart to display day and night production fluctuations, table comparison of quality rankings of various vehicle numbers, and radar chart to quantify inspector operation stability.
5、 Maintenance and troubleshooting
-Periodic maintenance plan: Clean the residual silk glue on the scale pan with isopropanol every week, calibrate the parallelism of the mechanical structure with special tools every month, and send it to the measuring institution for re calibration every six months.
-Typical troubleshooting guide: If the "Err_LF" overload error occurs, immediately unload and check if the transmission lever is stuck; When encountering data jumps, the AD conversion module needs to be replaced.
The precise application of raw silk fineness meter requires the integration of metrological principles and textile technology practice, strictly following the JJF (Textile) 042-2020 calibration specification, and paying attention to product standard updates such as GB/T 1797-2008. It is recommended to establish a 'human machine material method environment' five in one management system and regularly participate in CNAS proficiency testing to ensure the international mutual recognition of test results.