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Method of rolled paper cutting and integrated stock optimization in paper factory

A paper roll and inventory technology, applied in instruments, data processing applications, logistics, etc., can solve the problems of low inventory cost, short delayed delivery time, short delivery time for demand, etc.

Inactive Publication Date: 2009-11-25
SOUTH CHINA UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a comprehensive optimization method for paper roll slitting and inventory in a paper mill, aiming at the deficiencies and defects of existing methods in solving large-scale and complex paper cutting optimization problems. By using this method, the production of paper mills can be It can meet customer order requirements (various product specifications, large demand, short delivery time), and can reduce its production cost (minimum leftover paper waste, lowest inventory cost, shortest product delayed delivery time, and lowest production switching cost) )

Method used

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  • Method of rolled paper cutting and integrated stock optimization in paper factory
  • Method of rolled paper cutting and integrated stock optimization in paper factory
  • Method of rolled paper cutting and integrated stock optimization in paper factory

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Embodiment

[0080] Take a class of newsprint mills with a variety of products, short lead times, high inventory costs, and large paper machine output as an example. Among them, there is one paper machine and two rewinders. The maximum speed of the paper machine (v m max ) is 2000m / min, the daily vehicle speed (v m ) is 1600m / min, the maximum width of the paper roll produced (BJ j max ) is 10.06m. The transfer time of the large paper roll from the paper machine to the rewinder (T t ) is 3min. The maximum speed of the two rewinders (v w max ) is 2500m / min, the daily vehicle speed (v w ) is 2000m / min, the maximum number of copies that can be cut into large paper rolls (NJ j max ) is 15 copies (a total of 16 cutters), and the width of the edge of the paper must be cut off at least on both sides of the large paper roll (Δ j min ) is 0.03m, the width that can only be cut at most (Δ j max ) is 0.25m. Therefore, the effective width of the jumbo roll, that is, the width of each com...

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Abstract

This invention provides a method of rolled paper cutting and integrated stock optimization in paper factory, comprising the following steps: step one, determining an initial size of a problem about rolled paper cutting and integrated stock optimization; step two, establishing a mixed integer linear programming model for rolled paper cutting and integrated stock optimization; step three, solving a problem about mixed integer linear programming for rolled paper cutting and integrated stock optimization that is combined by two steps above to obtain an optimum target value and scheduling project; step four, adding one level to the size of the optimization problem to compose an optimization problem in new size; step five, solving the optimization problem in new size to obtain a new optimum target value and scheduling project possibly; step six, if the target value obtained in step five is superior to the target value obtained in step three, repeating steps four and five, otherwise, outputting the scheduling project obtained in step five. This invention can obtain the optimum rolled paper scheduling project without excessively adding the problem size.

Description

technical field [0001] The invention relates to a method for production scheduling and inventory management in a paper mill, in particular to a method for comprehensively optimizing paper roll cutting and inventory in a paper mill. Background technique [0002] Papermaking enterprises are typical process enterprises, with the characteristics of large order quantity, short product delivery time, and high inventory cost. The production process is often affected by factors such as raw materials, energy, equipment, and manpower. Improper production scheduling methods will not only cause bottlenecks in the operation of paper-making enterprises, but also cause waste of various resources and increase the production costs of enterprises. Paper roll slitting is an important link to save the production cost of paper mills. It requires cutting various small paper rolls that meet product specifications on large paper rolls with a certain width, and to minimize the remaining paper edge w...

Claims

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Application Information

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IPC IPC(8): G06Q10/00G06Q50/00G06Q10/08G06Q50/28
Inventor 刘焕彬潘明李继庚
Owner SOUTH CHINA UNIV OF TECH
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