绵羊皮革质量检测多指标综合分析数据
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行业内企业可对照上述区间，确定本公司羊皮革原料或产品的质量水平。若羊皮革SQI值位于质量水平低区间，表明质量很差，需警惕；若羊皮革SQI值位于行业均值区间，代表质量达标，处于行业平均水平，有一定的提升空间；若羊皮革SQI值位于优质稳定区间，代表原料质量较优，有良好的市场竞争力；若羊皮革SQI值位于行业标杆区间，则皮革原料质量十分优秀，行业顶尖，可设为质量标杆。进而为企业制定质量管理控制和绩效考核提供依据。数据来源于近3年海宁地区送检的绵羊皮革检测数据，检测标准QB/T 1615。由于数据表示方式不统一，对数据进行修正处理（代号加V）：FC未检出，FCV=100；20≤FC≤300，FCV=（100-100*（FC-20）/(300-20)）；FC＞300，FCV＝0。pH＜3.2，pHV=0；3.2≤pH＜3.6，pHV=60；3.6≤pH＜4.0，pHV=65；4.0≤pH＜4.4，pHV=70；4.4≤pH＜4.8，pHV=75；4.8≤pH＜5.2，pHV=80；5.2≤pH＜5.6，pHV=85；5.6≤pH＜6.0，pHV=90；pH≥5.6，pHV=95。CCV=(CDV+CWV)/2）：CFD＜3，CDV=0；CFD=3，CDV=60；CFD=3-4，CDV=70；CFD=4，CDV=80；CFD=4-5，CDV=90；CFW＜2-3，CWV=0；CFW=2-3，CWV=60；CFW=3，CWV=70；CFW=3-4，CWV=80；CFW=4，CWV=90；CFW=4-5，CWV=100。TS＜9，TSV=0；9≤TS＜49，TSV=TS+51；49≤TS，TSV=100。 数据处理：1、在检测结果为真羊皮革、无严重异味、可分解有害芳香胺染料未检出的前提下，根据不同类型指标对服用性能的影响程度，确定权重系数。甲醛含量权重系数0.3，pH权重系数0.2，色牢度权重系数0.2，撕裂力权重系数0.3。计算公式：羊皮革综合质量指数SQI =0.3*FCV+0.2*pHV+0.2*CCV+0.3*TSV。 2、收集全行业面料样本的SQI值，计算均值μ、标准差σ。 3、区间修正，确定分级标准确定分级标准：质量水平低：SQI＜μ-1.7σ、行业均值：μ-1.7σ≤SQI＜μ＋0.2σ、优质稳定：μ＋0.2σ≤SQI＜μ＋1.2σ、行业标杆：μ＋1.2σ＜SQI。
Enterprises in the industry can refer to the above intervals to determine the quality level of their own sheep leather raw materials or products. If the sheep leather SQI falls into the low quality interval, it indicates very poor quality and requires vigilance; if the sheep leather SQI falls into the industry average interval, it means the quality meets the standard, is at the industry average level, and has room for improvement; if the sheep leather SQI falls into the excellent and stable interval, it means the raw material quality is relatively excellent and has good market competitiveness; if the sheep leather SQI falls into the industry benchmark interval, the leather raw material quality is extremely excellent and top-notch in the industry, and can be used as a quality benchmark. This provides a basis for enterprises to formulate quality management control and performance assessment. The data is derived from the test data of sheep leather submitted for inspection in Haining area over the past 3 years, following the test standard QB/T 1615. Due to inconsistent data representation, data correction was carried out with the suffix V added to the corresponding code: 1. For FC not detected, FCV=100; 2. For 20≤FC≤300, FCV=100 - 100*(FC-20)/(300-20); 3. For FC＞300, FCV=0. For pH value conversion: - If pH＜3.2, pHV=0; - 3.2≤pH＜3.6, pHV=60; - 3.6≤pH＜4.0, pHV=65; - 4.0≤pH＜4.4, pHV=70; - 4.4≤pH＜4.8, pHV=75; - 4.8≤pH＜5.2, pHV=80; - 5.2≤pH＜5.6, pHV=85; - 5.6≤pH＜6.0, pHV=90; - pH≥5.6, pHV=95. For CCV calculation: CCV=(CDV + CWV)/2. The conversion rules are as follows: - For CFD＜3, CDV=0; - CFD=3, CDV=60; - 3＜CFD≤4, CDV=70; - CFD=4, CDV=80; - 4＜CFD≤5, CDV=90; - For CFW＜2-3, CWV=0; - CFW=2-3, CWV=60; - CFW=3, CWV=70; - 3＜CFW≤4, CWV=80; - CFW=4, CWV=90; - 4＜CFW≤5, CWV=100. For TS value conversion: - TS＜9, TSV=0; - 9≤TS＜49, TSV=TS + 51; - TS≥49, TSV=100. Data processing steps: 1. On the premise that the test result confirms genuine sheep leather, no serious peculiar smell, and decomposable harmful aromatic amine dyes are not detected, determine the weight coefficients based on the impact of different indicators on wearing performance. The weight coefficients are: formaldehyde content 0.3, pH 0.2, color fastness 0.2, and tearing strength 0.3. The calculation formula for the Sheep Leather Comprehensive Quality Index (SQI) is: SQI = 0.3*FCV + 0.2*pHV + 0.2*CCV + 0.3*TSV. 2. Collect the SQI values of all industry fabric samples, calculate the mean μ and standard deviation σ. 3. Interval correction and grading standard determination: - Low quality level: SQI < μ - 1.7σ; - Industry average: μ - 1.7σ ≤ SQI < μ + 0.2σ; - Excellent and stable: μ + 0.2σ ≤ SQI < μ + 1.2σ; - Industry benchmark: SQI > μ + 1.2σ.
