Average Weight

 Average Weight
Average weight applications require statistically checks on  the batch, and make appropriate records to ensure it's compliant.
The sampling methods you are using must be sufficiently accurate for your process.  The method used for calculating statistical mean value including the standard deviation plus  recording the number of packages in the T1 / T2 weight band and retained for 12 months with corrective actions recorded.
The 2006 average weight regulations  sets out three rules with which packers must comply:
- the actual contents of the packages should not be less, on average, than the nominal quantity;
- the proportion of packages which are short of the stated quantity by a defined amount (the “tolerable negative error” or TNE) should be less than a specified level; and
- no package should be short by more than twice the TNE.
The Directive also prescribes a specific test procedure (the reference test) which enforcement authorities will use at the premises of packers and importers, when it is necessary to establish whether a particular batch of packages comply with the first two rules. They place packers under a duty to ensure each batch of packaged goods complies with the three packers’ rules. Packers may use whatever quantity control and checking procedures they find convenient, so long as these are sufficiently rigorous to ensure compliance with the three packers’ rules. Trading Standards officers may carry out reference tests where they consider this appropriate to check compliance with the first two rules.(s15pg5)

Records of the product are required for each batch including  Time and Date, Batch Number, packing line, product name, nominal quantity, units plus density value used for liquids, Maximum weight , Minimum weight, standard deviation, statistical net weight for batches greater than 100 items.

Further details for EC packers are detailed in  WELMEC 6.4, 2015: Guide for packers and importers of ℮-marked prepacked products

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