QUALITY EVALUATION METHOD FOR RUBBER KNEADED PRODUCT

• Main Author: OZAWA OSAMU
• Format: Patent
• Language: English; Japanese
• Published: 03.12.2015
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MAKING GRANULES OR PREFORMS; MEASURING; PERFORMING OPERATIONS; PHYSICS; PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS; TESTING; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

PROBLEM TO BE SOLVED: To provide a quality evaluation method for a rubber kneaded product, capable of relatively simply grasping a degree of quality of abnormal products to normal products, and characteristics causally related to the occurrence of abnormal products.SOLUTION: Before a rubber kneaded product R is manufactured by mixing a raw material rubber and various compounding agents by a closed type rubber kneading machine 1, based on data on mixing characteristics related to mixing specifications of normal products of the rubber kneaded product R and data on material characteristics related to material specifications, a Mahalanobis distance Dis calculated, and a threshold C of the Mahalanobis distance which is a boundary between normal products and abnormal products is set. The Mahalanobis distance Dof the rubber kneaded products R for each batch is calculated, and then whether the rubber kneaded product R is a normal product or an abnormal product is determined in comparison between the calculated Mahalanobis distance Dand the threshold C. When it is determined to be an abnormal product, based on a correlation between the mixing characteristics and the material characteristics of the rubber kneaded product R, a causal relation between the mixing characteristics and the material characteristics is grasped. 【課題】正常品に対する異常品の品質程度や、異常品の発生に因果関係がある特性を比較的簡便に把握できるゴム混練物の品質評価方法を提供する。【解決手段】原料ゴムと各種配合剤とを密閉式ゴム混練機１に用いて混合してゴム混練物Ｒを製造するに際して、ゴム混練物Ｒの正常品の混合仕様に関係する混合特性のデータと、材料仕様に関係する材料特性のデータとに基づいてマハラノビス距離Ｄ2を算出して、正常品と異常品との境界となるマハラノビス距離の閾値Ｃを設定しておき、バッチ毎のゴム混練物Ｒのマハラノビス距離Ｄ2を算出してその算出したマハラノビス距離Ｄ2と閾値Ｃとを比較して正常品か異常品かを判断し、異常品と判断した場合に、そのゴム混練物Ｒの混合特性と材料特性との間の相関度に基づいて、その混合特性と材料特性との因果関係を把握する【選択図】 図１