Procurement Guidelines: Procurement and maintenance of Corrugated – Corrugated,
Typically, Corrugated There are two ways to buy. The first is the direct procurement, which is the most common choice; The second is rent, and to roll into the Corrugated management project. In both cases, to consider economic factors, including liquidity, cost, flute-type and roll life.
Buy Corrugated, the first consideration is the corrugation. Shocked most commonly used for each type (such as B, C, E flute type, etc.) There are many different accepted standards and specifications. Different leng high, flute pitch and flute combination out of corrugation arc different, to create a cardboard is different. A cardboard box in any business, roll size selection is a very important strategic decision. This decision is the key shrinkage, with commercial terms, which have significant cost impact. For example, the shrinkage rate will be reduced by 2%, effective provincial paper.
Shrinkage rate and the relationship between production costs
Contraction rate (TUR)
TUR = ((original ratio – the new rate) / original ratio)
For example, the two assumed shrinkage of corrugation B = ((1.3504-1.3165) / 1.3504) = 0.0251
As a percentage (multiplied by 100) to indicate that 2.51%.
Paper roll life savings in the cost of (euro)
Save paper costs = savings of paper weight (tons) (Wts) × cost per ton of paper
Wts = TUR × × average weight of paper, corrugated paper roll processing area;
Or Wts = TUR × (paper, the average weight × (roll life TUR × × original paper box, set the average width))
If the average weight of paper = 105gsm, roll life = 40,000,000 meters, paper box, set the average width = 2 m, the cost of paper is 300 euros per tonne, then Wts = 0.0251 × (105 × (40 × 1.3504 × 2)) = 284.7 tons
Note: The weight of the unit is gsm (g/m2), roll of life calculated in meters. If the traction factor
increased rate of expansion will be a negative factor, cost reduction will become a cost. ) So: roll life to save paper costs = 300 × 284.7 = 85,410 euros. To know the above equation is approximate, subject to different wear rate impact. However, they provide a simple calculation of the cost of different methods of corrugation.
Production costs
Second consideration of economic factors and costs related to the life of the roller. When calculating the ratio between the two, roll, installed with the bearings and other parts and installation of roll the total cost of labor should be taken into account.
Million units per linear length of the roll of the cost is calculated as follows:
Cost = cost + (roller bearings and other labor costs, installation costs +) / roll life
If the cost of 57,000 euros roll, bearings and other parts of the cost of 8,000 euros, the installation of labor costs 1,600 euros, life is 40,000,000 meters, cost / life ratio (C / mlm) should be:
C / mlm = total costs / total life
C / mlm = 66,600 euro / 40mlm = 1,665 euro / mlm
This equation can be used to assess the roll the results of running different decisions, such as re-grinding after the second and third use.
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