# Purchase analysis and example cost calculation of

2022-10-18
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Purchase analysis and example cost calculation analysis of corrugated roller

when purchasing corrugated roller, the first consideration is the corrugated type. There are many recognized standards and different specifications for each of the most commonly used ridge types (such as B, because the quality of the sensor determines the accuracy and force measurement stability of the experimental machine, C, e ridge types, etc.). Different ridge height, ridge spacing and ridge arc combine to produce different ridge types, and the produced cardboard is also different. In any ink "> carton enterprise, the selection of roll specification is a very important strategic decision. The key to this decision is the shrinkage rate, which has a significant impact on the cost in commercial terms. For example, the shrinkage rate will be reduced by 2%, which will effectively save paper.

the relationship between shrinkage rate and production cost

shrinkage rate (TUR) = {(original rate - new rate)/The original ratio}

for example, the shrinkage of two assumed b-shape = {(1..3165)/1.3504} =0.0251, expressed as a percentage (multiplied by 100), is 2.51%

cost of paper saved in the service life of the roll (euros) = weight of paper saved (tons) (WTS) cost per ton of paper

wts=average weight of TUR paper area of corrugated paper processed by the roll

or wts=tur {average weight of paper (life of roll, average width of original tur paper frame)}

if the average weight of paper =105gsm, the life of roll =40000000 meters, the average width of paper frame =2 meters, and the cost of paper is 300 euros per ton, then wts=0.0251 {105 (401.35042)} =284.7 tons

note: the unit of weight is GSM (g/m2), and the life of roll is calculated in meters

if the traction factor increases, the expansion rate will become a negative factor, and the cost reduction will become the cost increase.) Therefore: the cost of paper saved in the service life of the roller =300284.7=85410 euros. You should know that the above equation is approximate and is affected by different wear rates. However, they provide a simple method to calculate the cost of different types

production cost

the second economic factor to consider is the life of the roll related to the cost. When calculating the ratio between the two, the total cost of rollers, bearings and other parts used in installation and labor force for installing rollers should be taken into account

the calculation method of the cost of rolls per million units of linear length is as follows:

cost = {cost of rolls + cost of bearings, etc. + cost of installation labor}/life of rolls

if the cost of rolls is 57000 euros, the cost of bearings and other parts is 8000 euros, the cost of installation labor is 1600 euros, and the service life is 40000000 meters, The cost/life ratio (c/mlm) should be:

c/mlm= total cost/total life =66600 euros/40mlm=1665 euros/mlm

this equation can be used to evaluate the results of different decisions during roll operation, such as the second and third use after regrinding

generally, there are two ways to purchase corrugated rollers. The first is direct purchase, which is also the most common choice; The second is renting, and the roll is included in the corrugated roll management project. In these two cases, the economic factors to be considered include working capital, cost, ridge shape and roll life

suppose there is a pair of chrome plated rollers with a diameter of 400mm. After 30000000 meters of production, the chromium plating layer is just finished, and then grind the roll, or change the roll after 40000000 meters of production (until the hardened stainless steel corrugated material is finished) before grinding. Both options are feasible, and both have completed the first round of service life, but the second one saves costs than the first one. In the long run, we must see the impact of these two options on the future use of rollers

select 1

the initial purchase cost of the roller =67000 euros

the first use =30000000 meters, the cost of regrinding, re plating and re installation =40000 euros

the roller only loses a layer of surface, so it can be assumed that when it works again, the diameter and ridge shape of the roller return to close to the original specification, so the cost of paper is zero

the second use =30. It is learned from Wuhan Economic and Technological Development Zone that the cost of regrinding, re plating and re installation is 000000 meters =40000 euros, and the corrugated shape is restored to its original appearance. The third and last use =30000000 meters

due to large-area grinding, the roll broke after three uses. So total production =90000000 meters

total cost of purchase, regrinding and reinstallation =147000 euros

so total cost of roller =1633 euros/million meters

select 2

initial purchase cost of roller =67000 euros

first use =40000000 meters, regrinding, re plating and reinstallation cost =40000 euros

because the roller lost the whole coating and part of the base material, it is assumed that when working again, The shrinkage of the corrugated type will increase, which will lead to an increase of 25000 euros in the cost of paper in the subsequent 40million unit linear length operation

second use =40000000 meters, the cost of regrinding, re plating and re installation =40000 euros

after the second use, the cost of paper is 50000 euros, and the third and last use =40000000 meters

if the roller diameter is reduced a little, it will be lower than the minimum specification of the manufacturer, and the roller will break after three uses

so the total production =120 million meters

the total cost of purchase, regrinding and reinstallation =222000 euros

so the total cost of the roll =1850 euros/million meters

conclusion

the better way is to smash the roll after the second use in scheme 2, because the cost of grinding 40000 euros plus the cost of paper 50000 euros has exceeded the cost of a new set of rolls. After modifying selection 2, we get:

total production =80000000 meters

total cost of purchase, regrinding and reinstallation =132000 euros

spectrum analyzer

so the total cost of roller =1650 euros/million meters

the above example is completely hypothetical, but the reality is more complex

suppose there is a pair of chrome plated rollers with a diameter of 400mm. After 30000000 meters of production, the chromium plating layer is just finished, and then grind the roll, or change the roll after 40000000 meters of production (until the hardened stainless steel corrugated material is finished) before grinding. Both options are feasible, and both have completed the first round of service life, but the second one saves costs than the first one. In the long run, we must see the impact of these two options on the future use of rollers

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