TESTING PET JUMBO FILM SAMPLE

S.No. PROPERTY DEFINITION TEST METHOD TEST PROCEDURE1 Average

ThicknessAvg. thickness is the thickness of film over a particular length of film.

By using weighing machine

ASTM-D4138

Measure 10 cm. film sample in MD direction. Cut the sample in TD direction.

Measure width of sample in TD direction. Weigh the sample on weighing balance which is having capacity

to measure upto 4th decimal. Note down the weight in grams.

Avg .Thickness=Wt .∈gms¿¿2 Tensile

Strength & Elongation

Tensile strength is the maximum stress that a film can withstand while being stretched or pulled before failing or breaking.

Elongation is the % increment in length of film before breaking.

Tensile Machine

ASTM-D882

With the help of template cut the test specimen from the jumbo roll in such a way the specimen from all the three sides (left, centre, right) are obtained both in machine direction and transverse direction (MD/TD). Two specimens from each side and both direction shall be tested.

Ensure that that the test specimen should exactly 2.5 cm. in width.

Fix the test specimen between the two gripping of machines which are exactly 10 cm. apart.

Tight the gripping firmly to avoid the slipping of the film. Switch on the machine and continue the test till the sample

break between the two grips. Record the load at break. If the specimen which is failed in the grip shall be consider as

premature failure and another specimen shall be tested. Press the stop button at the time of break and note the

extension reading and load from the dial indicator.

3. Shrinkage Shrinkage is the % reduction in the dimensions of a film undergone through high temperature.

Hot air oven

ASTM-D2838

Cut a sample from jumbo roll with help of 10*10 inch template in such a way that the specimen from all the three sides (left, centre, right) are obtained.

Mark the MD & TD direction and record the dimensions. Hang the test specimen in oven set at :

I. 150 °±2 °C for 30 min (packaging grade)II. 200 ° ±2 °C for 20 min (yarn grade)

Check the temperature of thermometer before hanging the specimen being into ambient temperature from oven and record the dimensions.

% Shrinkage= X−YX

∗100

X – initial dimension of test specimen Y – final destination (after oven)

4 Haze haze is the percentage of light that is deflected more

Haze Guard

ASTM-D1003

Cut at least three layers of film as per the size 100 mm * full width (TD)

Place one specimen layer out of three layers previously cut at entrance point of se nsing unit. After that press the paddle

TESTING PET JUMBO FILM SAMPLE

than 2.5 degree from the incoming light direction.

for sensing the reading. While taking the readings note that no dust goes on the film & there is no thumb impressions, folded at the time of measurement.

The obtained value will be haze of the film, report max & min value.

Take 5 to 10 from left to right.5 Friction Friction is the

force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.

Types : Static Dynamic

RDM test equipment

ASTM-D1894

A piece of the test sample is held on the test bed by means of the vacuum channel so that the film surface is flat, smooth and unscratched.

Another piece of the same sample is cut using the template and fixed to under side of the sled again using pressure sensitive tape.

The sled is placed on the test bed. The sled is drawn by the drive mechanism for a distance at the

constant speed required by the test standard in use i.e. (15 cm/min).

The force required to start the movement of sled is held by the digital display and is taken as a static coefficient of friction.

The force required to maintain movement of sled continuously measured by the load cell and directly indicated on the force meter. This force meter reading during the sled travel is taken as kinetic coefficient of friction.

Coefficient of friction= AW

A – Force in gramsW – Sledge weight (200 gms.)

6 Surface tension

Surface tension is a contractive tendency of the surface of a liquid that allows it to resist an external force

Solution of : Formamide Ethane

ethanol

ASTM-D2578

Spread test fluid from the pen tip lightly over an area of approx. 7 cm sq. of the test specimen noting the time it takes for the continuous film of ink to break into droplets.

Wetting is normally adequate when a continuous film of test fluid remains intact for two seconds. Breaking of fluid into droplets in less than two seconds indicates lack of wetting and a lower numbered test fluid should be tried.

If the fluids remain intact for longer than two seconds a higher numbered test fluid should be tried. The aim is to establish the lowest reading at an optimum dwell time of two seconds.

Extreme care must be taken to ensure the film surface is not touched or contaminated in the areas in which test are to be made.

It is recommended that when testing during production, the test fluid should be applied across the full web width and it should be noted that shrinkage of the liquid film on the sides of applied fluid does not necessarily indicates a lack of wetting.

7 Optical OD is the term OD meter

TESTING PET JUMBO FILM SAMPLE

Density used to relate the amount of light transmitted through a phototool to the amount of light it receives.

M-D3981OD=log10

Incident light intensityTransmitted light intensity