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What is a parting film?

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What is a parting film?
An isolated film is a thin film with a separable surface, and the resulting film does not have a sticky or slight stickiness when contacted with a particular material under limited conditions.
Classification of release films


A substrate classification:

1 PE (polyethylene) release film
2 BOPP (polypropylene) release film
3 PI (polyimide) high temperature release film
4 PET (polyethylene terephthalate two) release film
5 other: PC, PS, TPS, PVC......


B classification by silicone oil coating:

1 silicone solvent type
2 silicone solvent-free
3 fluorine type
4 emulsion type
5 UV curable (UV)
6 water-based
7 no silicon type


Silicone oil type

1 according to the surface color: Red release film, yellow detachment film, green film, blue film, white film and other colors of PET release film
2 substrate surface treatment: single release film, double release film
3 press release force: super light release force, 1~5gf/in
Light from the type of force is larger than 5gf/in, less than 20gf/in
From the type of medium, 20gf/in or less than 60gf/in
From the type of heavy force is larger than 60gf/in, less than 100gf/in
Overweight peel strength, more than 100gf/in


Release film structure

Product category:
1. single or double PET coating release film;
2., light to overweight;
3. other production according to customer requirements;


Product features:

1. low noise, soft when peeling, superior adhesion;
2. clean room processing, quality stability;
3. selection of various thicknesses (25 m to 175 m);
4. antistatic treatment;
Technical requirements for release films:
Force (Release)
Residual force (Subsequent, adhesion)
Coverage (Coverage)
No silicon, no extinction, no silicon transfer (No, rub-off, no, smear, no, migration)
Extraction rate (Extractable)
About testing
Test condition:
- Tesa7475 standard adhesive tape
180 degrees peel off
Peel speed 300mm/min
23 + 2, 50 + 5%RH
Test method and condition of FINAT displacement


Displacement test

By two metal or glass panels will be the sample press the sample under 70gf/cm - pressure lowering devices 20H in 23 + 2 DEG C, to ensure that the silicone adhesive and good contact from the type of substrate, after the samples were removed, the relative humidity is 50 + 5%, standard environment the temperature of 23 + 2 DEG C in at least 4 hours before they are placed to do peel test. The test value for 24 hours is the permanent peel force of the release film!


Aging peeling test

A group of metal or glass panels will be placed in the same sample, and the spline is placed in the air circulating system of the oven set at a temperature of 70 + 5 DEG C, aging 20H, tested samples out of the oven after at least 4 hours, placed after a peel test.
Residual force (Subsequent, adhesion)


Test condition:

Tesa7475 standard tape, /NITTO31B tape
180 degree peel
Peeling speed 300mm/min
23 + 2 DEG C, 50 + 5%RH
SAS, that is, the ratio of the peel force change after the adhesive tape contacts the parting surface
FINAT residual bonding force (SAS) test method and condition


Tesa7475 standard adhesive tape

The test finished from the type of force standard tape to clean after the SUS test board, at the same time under the same conditions with a standard test on the tape, the relative humidity is 50 + 5%, 23 + Standard ambient temperature 2 DEG C at least placed 30min, then tested two tested samples stripping force, according to the following formula:
Residual force = = (force required for stripping tape / stripping control tape) *100%
Remarks: the test method reflects the adhesion of the release agent to the substrate in the release film
Test method and condition for residual adhesion of 31B


NITTO31B tape

The NITTO31B tape attached to be tested according to the standard methods from the film and standard Teflon paper, according to the shape of the tape cut into strips, and bear the pressure placed on the 20gf/cm - 70 degree oven 20H, after being taken out at a speed of 300mm/min meter relay with 180 degrees off, will be tested from the film on tape income the data were compared with data from Teflon tore, according to the following formula to calculate the residual adhesion;
Residual force = = (force required for stripping tape / stripping control tape) *100%
Remarks: the test method reflects the adhesion of the release agent to the substrate in the release film
Modes of coating presence


Rating of release film

No silicon, no extinction, no silicon transfer
No fall, no silicon extinction test with appropriate pressure fingers to friction 10 times, to determine whether the gel off, again with a black mark pen drawing thick line in a vertical friction before, according to the depth of color, compared with standard samples, determine the level of:


From Level 5 without extinction, without shedding silicon

Keywords Level 4 light extinction
3 Level from extinction
Keywords Level 2 off silicon
Keywords Level 1 serious silicon off
Keywords: silicon transfer test (only available Sellotape tape) for a Sellotape stick on the surface of the coating, with appropriate finger pressure to heal, remove the adhesive tape to make the two ends naturally contact to form a ring. Then pull apart to separate it. In contrast to the tape (blank tape) that has not been applied to the coated surface, if the silicon shift occurs, the force required to pull the tape will be less than the force required for the tape. Write down the results: no silicon metastasis, mild silicon metastasis, severe silicon metastasis......
important indicator


Extraction rate (Extractable)

1. measure the coating quantity A
2. put in toluene solvent for 72 hours
Take out after 3.72 hours and dry naturally at room temperature
4. measure the coating quantity B
5. extraction rate of n (A-B) /A] * 100%

Note: if the extraction rate is 10%, it means that 10% of the silicone oil is not reactive, or the degree of crosslinking is insufficient


Official website:http://en.kejian-tech.com/
Adhesive website:http://www.kinsgeo.com/en/

Alibaba: http://kejian-tech.en.alibaba.com/   https://kejiantest.en.alibaba.com/

Trade website:http://www.universal-testingmachines.com/