Abstract A new type of stringent sampling inspection plan is proposed for cell counts generally in line with a Poisson or a mixed-Poisson type of distribution. The proposed plan is based on setting an upper envelope estimated from the sample counts which should remain below the given microbiological limit m. We used Monte-Carlo simulation methodology to evaluate the proposed plans and showed that the lot acceptance criterion using the upper envelope improves consumer protection in general. Both two and three class attribute plans are investigated for establishing the upper envelope. Our study reveals that the proposed plans can offer better consumer protection and economy when compared to both two and three class attribute plans. It is also demonstrated that a slightly stringent plan can be found in place of lognormal type variables plans. The limitations of the proposed new plans, and a discussion on alternative stringent rules for batch acceptance are also provided. The new plan was also validated using the APC cell counts observed for 2000 milk powder batches. Our conclusion is that the proposed stringent plans can improve protection to the consumer, particularly for exported food products.

中文翻译：

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使用上限信封进行细胞计数的严格抽样检查计划

摘要 针对一般符合泊松分布或混合泊松分布的细胞计数，提出了一种新型的严格抽样检验方案。提议的计划基于设定一个上限，该上限应根据样本计数进行估计，该上限应保持在给定的微生物限度 m 以下。我们使用 Monte-Carlo 模拟方法来评估提议的计划，并表明使用上限的批次验收标准总体上改善了消费者保护。研究了二类和三类属性计划以建立上限。我们的研究表明，与二级和三级属性计划相比，拟议计划可以提供更好的消费者保护和经济性。还证明了可以找到一个稍微严格的计划来代替对数正态变量计划。还提供了提议的新计划的局限性，并讨论了有关批次验收的替代严格规则。新计划还使用对 2000 批次奶粉观察到的 APC 细胞计数进行了验证。我们的结论是，拟议的严格计​​划可以改善对消费者的保护，尤其是对出口食品。