FORMS FOR CALCULATION OF REQUIRED KILOGRAMS
Example for the case of a packing in folded film covering a product of regular form.
In order to determinate the amount of Kg of required material for packing a product, we should know first:
Amount of required packages.
For the calculation, will use the following formula:
D = M/V
= density of the packing material, in g/cm3.
or what it is the same:
material for packing a product = Required packages
number X Length of packing material X Width of packing material
X Height of packing material (Thickness) X Density of packing
We must remember that in order to obtain appropriate results, we should use the same units in whole formula, consequently, adapting the previous formula to the units normally used and to the commonly used form of presentation of the film (see figure 1), it remains in the following form:
K = ( N x L x A x C x (2.54/100,000) x 2 x D )/ 1000
= Amount of required Kg for packing a product.
Calculating the amount of PVC shrink film required in order to pack 10,000 packages with the dimensions shown in the following figure:
1. N = 10,000 packages.
2. Dimensions of the product = 40 x 30 x 10 cm, consequently the dimensions of each packing will be (see figure 3):
Note. In case of having a product with different dimensions in both ends, you will use the average value of both ends, for example, if one side measure 8 cm and the other side 10 cm, the value that will take for calculation will be 9 cm.
L = 42 cm.
Note. Preferentially, the product to pack will make comfortable according to the previous figure in order to facilitate the packing and diminish the waste, that is, the minor dimension will correspond to the height, for diminishing the dog ears and the wrinkles in corners; from the other two dimensions the longer will correspond to the roll width, for the lower amount of waste (in this case 30 cm instead of 40 cm), but this is not advisable for small measures (widths lower to 15 cm), because its manufacturing is hindered.
Used material = PVC
Minimum amount of kilograms required by the customer (you will be suppose to add the material that considered as waste in the packing process and 10% additional for possible variations in width and gauge of the packing material):
K = ((10,000 x 42 x 57.5 x 100 x (2.54/100,000) x 2 x 1.35)/ 1000)*1.1 = 182 Kg of folded PVC shrink film of 54 cm, gauge 100
Last review of this page: 06/Aug/2013
Amount of required material for packing a product (PVC Shrink film).