Wool Exporters and processors are required by purchasers to provide test certificates that show that a consignment of wool meet the requirements specified in a contract. These documents are also used to authorise payments by banks issuing letters of credit. Consignments often consist of numerous sale lots purchased according to the contract specifications. As it is not cost effective for the individual sale lots to be resampled and measured again as a single test, AWTA provides a service where the tests results of individual sale lots can be arithmetically combined to show the overall average measurements on a single IWTO Combined Certificate. These IWTO Combined Certificates are widely recognised and trusted throughout the wool supply chain. Similarly, the same process can be used to produce Objectively Matched Lots, however the combination of lots is restricted by minimum and maximum measurement ranges.
組合計算
說明 IWTO-31 中定義的平均纖維直徑、CVD 和纖維直徑分佈組合程序的資料表可供下載。IWTO-31 標準規定了所有可驗證參數和其他供參考參數的組合程序。
這些包括
- 羊毛底座 (WB)
- 蔬菜物質基礎 (VMB)
- 硬頭 (HH)
- 平均纖維直徑 (MFD)
- 直徑變異係數 (CVD)
- 光纖直徑分佈 (FDD)
- 釘長 (SL)
- 釘強度 (SS)
- 休息位置 (POB)
- 顏色 (X,Y,Z)
- 商業收益率
下文的資料說明書提供了建立「客觀配對批次」(OML) 的其他規則和計算方法。
瞭解更多資訊：
樣本試算表
以下提供的試算表顯示所有組合計算，以及以減法進行組合的程序。當從交貨中移除一小部分（重量小於 5%）時，會使用減法組合試算表。被移除的成分會重新進行測試，並從原始組合中減去。