General Testing Procedure For PVC PACKING MATERIAL

    1.      Description:

PVC film of specification: - Non toxic transparent /nontransparent PVC. It shall be free from foreign matter, patches. It shall be wound on Aluminium / Plastic / Cardboard core without any loose pieces.
 2.      Width:
Ø  Take a sample of 1 meter from each roll if the no. of rolls is less than 5. If the no. of rolls is more than 5 then sample should be taken by the formula √n + 1.
Ø                  Measure the width by measuring scale at different places.
Ø            Take average of above readings. Tolerance: ± 1.0mm
 3.      Total Grammage:
Take 3 samples from 3 different rolls. Cut it to 05 X 05 cm, Weigh it and calculate the Grammage with following formula.
                              Weight of the piece in gm X 100 X 100                 =     −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
                                                5.0    X      5.0 4.      Thickness:
Cut 5.0 X 5.0 cm Piece of the PVC film. Record the weight of this piece and thickness by the following formula.
                                                                                 X 10
                       Thickness of PVC =     ------------------------------- mm                                                                           X             X1.41Whereas 1.41 is specific gravity of PVC film

 

5.      Functional Test:
Take a roll of different specimen take trail on machine for the first consignment of Manufacturer or if any new manufacturer is there.
   
1.  Sealing – Check it for leakage.
2.  Blister formulation.
3.  Colour change during sealing.
 

6.      Shrinkage and Expansion Test of PVC Film:

Cut a piece of 10 x10 cm. accurately marking machine direction and web direction put this piece on a butter paper and Keep in an oven for 10 minutes the temperature  of which is set at 140°C. Remove the film and after attaining room temperature, measure the in both directions. The limits are as follows
 Shrinkages in machine direction …….7.0 % max.
Expansion in web direction      ……... 2.5 % max.
    After Treatment Wt:       =    −−−−−−−−−−−−−−−−−−−−−−− gm                                                               X 100 X 100Gram mage of PVC:       =    -------------------------------------    gm/m²                                                            X                                                                                                 X 100 X 100 Gram mage of PVC Layer (a -b):   =   ----------------------------------------------   gm/m²                                                                                            X