Poly bag consumption and costing

Poly bag consumption and costing

Poly bag is the most common and important item in apparel industry. Normally we used different kinds of bag to pack the goods. We packed the garments with poly bag before insert in a carton for shipment. In apparel industry, we use one poly for one garment, we called it single poly and insert several single polys in a big poly bag, we called it “blister poly”.
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Poly bag calculation is important part for garments merchandiser. Commonly we known as polythene. Poly bag has used to protect from dust or dirt, moisture. In garments industries, maximum company has used those poly bag, material used PP (polypropylene), PE (polyethylene), LDPE (low density polyethylene) & HDPE (high density polyethylene) etc. Worldwide, gauge is used most system of counting poly bag's thickness.
Before starting the poly bag consumption, a garments merchandiser should confirm the following information at first;
  • Poly bag length in inch.
  • 1/2 flap of poly bag (because flap is single layer & length, width of poly bag is double layer)
  • Poly bag width in inch
  • Thickness of poly bag in gauge
  • Number of print on the poly bag (print means text, logo, warning etc.) 
  • Polymer rate of per lbs. (pound) of the following poly bag (It may PP, PE or LDPE etc. )
Formula: For 1,000 pcs poly bags in KGs = {(Length + Half flap) X Width X Gauge / 3300}

Q.1: Suppose, Poly bags having length is 29 cm, Half flap 5 cm, Width 26 cm & poly thickness 160 gauge. Now find out weight of 1000 pcs poly bags?

Solution: Poly bags in KGs = {(Length + Half flap) X Width X Gauge / 3300 }
                                             = {(29 + 2.5) X 26 X 160 / 3300}
                                             = {31.5 X 26 X 160 / 3300}
                                             = 39.709 KGs for 1000 pcs   
                                             
Note: We used half flap during calculation because flap is single layer & length, width of poly bag is double layer.

Q.2: Suppose, per pcs poly weight is 0.0397 KGs, polymer price 1 lbs (pound) is $0.35. Now find out the price of per pcs poly?

Solution:  Per pcs poly weight X Polymer price
              = 39.709 / 1000 X $0.35
              = 0.0397 X 2.2 X $0.35                  [ 1 kg = 2.2 lbs ]
              = $0.03056 /pcs 

Q.3: Suppose, Poly bags having length is 30 cm, half flap 5 cm, width 25 cm & poly thickness 150 gauge, 1 lbs polymer price is $0.35. Now find out the cost 1 pcs poly bag?

Solution:
Poly bag cost = {(Length + Half flap) X Width X Gauge / 3300 / 1000 X Price}
                                      = {(30 + 2.5) X 25 X 150 / 3300 / 1000 X $0.35}
                                      = {32.5 X 25 X 150 / 3300 / 1000 X $0.35}
                                      = 0.0369 KGs X $0.35
                                      = 0.0369 X 2.2 X $0.35                             [ 1 kg = 2.2 lbs ]
                                      = $0.0284 / pcs