| 摘要 |
According to a lower limit value of the recycling ratio of collected used products in a storage, constitution of raw materials of collected used products in a storage, constitution of products utilizing recycled materials in a storage, a lower limit value of a recycled material utilization ratio in a storage, a predicted supply amount of raw materials to a recycle process in a storage, and a production plan of products utilizing recycled materials of a production process in a storage, a calculation module creates a production plan of recycled materials in a recycle process to minimize the total of a before-recycle stock in the recycle process and a before-production stock in the production process. Using the production plan of recycled materials, the calculation module obtains a change plan of a recycled material utilization ratio to create a production plan of products utilizing recycled materials in the production process.
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