Patent ID: 11904503
Assignee: COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN
Field: Other special machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A method for creating batches of unvulcanized rubber before mixture in a rubber mixer, including selecting at least one batch for mixing in the rubber mixer, wherein each batch corresponds to a selection of uncured rubber bales (AI, BI, CI) that correspond to natures (A, B, C) of rubber composition having predetermined characteristics, comprising the steps of:
providing a supply station where the uncured rubber bales (AI, BI, CI) are supplied from the corresponding natures (A, B, C);
selecting uncured rubber bales (AI, BI, CI) from natures (A, B, C) and in a predetermined proportion corresponding to a selected batch at the supply station;
providing a cutting station for cutting at least one uncured rubber bale (AI, BI, CI) into pieces (AIJ, BIJ, CIJ);
providing a transport system that feeds the cutting station and transfers the uncured rubber bales (AI, BI, CI) and the pieces (AIJ, BIJ, CIJ) to the rubber mixer;
weighing the uncured rubber bales (AI, BI, CI) and the pieces (AIJ, BIJ, CIJ) to obtain a sum of a weight of the uncured rubber bales (AI, BI, CI) and a weight of the pieces (AIJ, BIJ, CIJ);
comparing the sum obtained with a required weight of the selected batch, which is created by mixing different kinds and different grades of elastomers; and
obtaining, in a proportion corresponding to the predetermined proportion, a target weight to attain a difference between the sum obtained and the required weight of the selected batch,
wherein the uncured rubber bales (AI, BI, CI) and the pieces (AIJ, BIJ, CIJ) are transported between the supply station, the cutting station and the rubber mixer according to a sequence determined by the equivalence between the required weight of the selected batch and (a) the weight of the uncured rubber bales (AI, BI, CI) or (b) a sum of the weight of the uncured rubber bales (AI, BI, CI) and a weight of the pieces (AIJ, BIJ, CIJ), and
wherein the step of obtaining a target weight further comprises the following steps:
providing a reference rubber bale (R) of a nature (A, B, C) and a predetermined proportion that corresponds to a batch at the bale supply station, the reference rubber bale (R) having a predefined weight and a predefined length (L) between one end (RL) and an opposite end (RL′); and
determining a cutting length (LC) and a cutting position (P) of a learning cut of the reference rubber bale (R) that are required to obtain the required weight of the selected batch.