食品级纸餐盒的尺寸偏差测量是一个精确的过程，通常遵循以下步骤进行：
　　The measurement of size deviation of food grade paper lunch boxes is an accurate process, usually following the following steps:
　　一、测量工具
　　1、 Measurement tools
　　使用精度为0.02mm的游标卡尺作为测量工具，以确保测量的准确性。
　　Use a vernier caliper with an accuracy of 0.02mm as the measuring tool to ensure the accuracy of the measurement.
　　二、测量部位
　　2、 Measurement location
　　分别测定纸餐盒的底部长边、底部短边以及斜高这三个关键部位的尺寸。
　　Measure the dimensions of the bottom long side, bottom short side, and diagonal height of the paper lunch box separately.
　　三、测量过程
　　3、 Measurement process
　　取样：从待测的纸餐盒批次中随机选取一定数量的样品，通常每个样品需要测定5个试样，以提高数据的可靠性和准确性。
　　Sampling: Randomly select a certain number of samples from the batch of paper lunch boxes to be tested. Usually, 5 samples need to be tested for each sample to improve the reliability and accuracy of the data.
　　测量：使用游标卡尺对每个试样的底部长边、底部短边和斜高进行测量，并记录测量值。
　　Measurement: Use a vernier caliper to measure the bottom long side, bottom short side, and slope height of each sample, and record the measurement values.
　　计算：计算每个试样测量值的最大值、最小值与平均值的差值，这个差值即代表了该试样的尺寸偏差。然后，对所有试样的尺寸偏差进行统计分析，得出该批次纸餐盒的尺寸偏差范围。
　　Calculation: Calculate the difference between the maximum, minimum, and average values of each sample measurement, which represents the size deviation of the sample. Then, statistical analysis was conducted on the size deviation of all samples to determine the size deviation range of the batch of paper lunch boxes.
　　四、判定标准
　　4、 Judgment criteria
　　根据具体的标准或合同要求，对测量得出的尺寸偏差进行判定。一般来说，底部长边和底部短边的偏差应在±2mm以内，斜高偏差则为±3mm（这一标准可能因具体的产品要求而有所不同，因此在实际操作中应参照相关标准或合同规定）。
　　Based on specific standards or contract requirements, determine the dimensional deviation obtained from measurement. Generally speaking, the deviation between the long and short sides of the bottom should be within ± 2mm, and the deviation of the inclined height should be ± 3mm (this standard may vary depending on specific product requirements, so relevant standards or contract provisions should be referred to in actual operation).
　　五、注意事项
　　5、 Precautions
　　在测量过程中，应确保游标卡尺的精度和准确性，避免由于测量工具的问题导致测量误差。
　　During the measurement process, the accuracy and precision of the vernier caliper should be ensured to avoid measurement errors caused by problems with the measuring tool.
　　取样应具有代表性，能够真实反映该批次纸餐盒的尺寸偏差情况。
　　The sampling should be representative and able to truly reflect the size deviation of the batch of paper lunch boxes.
　　测量时应注意避免对纸餐盒造成损坏或变形，以确保测量结果的准确性。
　　When measuring, attention should be paid to avoiding damage or deformation to the paper lunch box to ensure the accuracy of the measurement results.
　　通过以上步骤，可以精确测量食品级纸餐盒的尺寸偏差，并依据相关标准或合同要求对其进行判定。这对于确保纸餐盒的质量稳定性和满足客户需求具有重要意义。
　　Through the above steps, the size deviation of food grade paper lunch boxes can be accurately measured and judged according to relevant standards or contract requirements. This is of great significance for ensuring the quality stability of paper lunch boxes and meeting customer needs.
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