Quality defect & treating methods of dry lamination products

Hickie

l、Phenomenon:

There are many scattered spots on the surface of lamination film,especially on the metallized products or light ink printed products.It appears dusky color when serious.

2、Reasons and strategies 

1)Lack of coating—— Adding coating

2)Levelling property of cementing compound is poor.——Using better levelling property cementing compound,which contains high solid and low viscosity.

3)The surface tension force of basic film is too small——redealing with basic film and improving the surface tension force.

4)Too much solvent residue——adjusting dull and dry workmanship

5) Changing the coating method is also a way to deal with hickie.

二、Bubble

1、Phenomenon: It seems like hickie,while it is different from hickie.It is characterized by the separation between the two layers,also with the presentation of “ bubble”.

2、Reasons and strategies:

1)Too much solvent residue——Adjusting dull and dry workmanship to ensure the qualified residue

2)Relative humidity in the air is too high——Choosing dehumidification method while keeping RH (60%)

三、Ruffle tunnel

1、Phenomenon:There are unsmooth ruffle for lamination products.Two layer films isolating on the ruffle place will form of tunnel,which usually appears on the both ends.It will traverse when serious.

2、Reasons and strategies: 

1)Tension force is out of control——Adjusting the toll tension of basic film.

2)The initial adhesion of cementing compound is too small——Choosing cementing compound of large initial adhesion

3)Rolling tension force is too small——Enlarging the rolling tension force.

4)Halfway drying ——Strengthen drying ability.

四、Indentation

Phenomenon:The lamination product was cured,there are some unsmooth small indentations,which is close to the hundreds of maters of centered part.It usually appears each one on each roll,but not the ruffle and tunnel.

2、：Reasons and strategies:

1)Rolling tension force is improper.Loose external and tight internal.

2)Curing temperature is too high——Dropping curing temperature and extending curing time.

3)Heat-shrink rate of basic film is too large——Choosing outer film with small heat-shrink rate .

4)There are some mottled

 bubble——Using the method of cutting residual solvent down to eliminate mottle and air bubbles.

5)Too much annexing agent of the inner film——Choosing smooth film or the film,which is not easy to separate from the annexing agent.

6)：

Low quality of cementing compound——Choosing the best adhesive powder and cohesive force cementing compound.Especially choosing the functional cementing compound

五．Moving and carrying the metallized layer leads to low release force

六．

l.Phenomenon: Release force is relatively high before fully curing lamination film.The metallized layer is easy to move to glue film after fully curing,leading to much lower release force.(less than 0.6N/15ram)

2.Reasons and strategies:

The quality of metallized film itself is not good.The fastness is too small between the metallized layer and basic film.——Using a better metallized film.

The metallized film is damaged when operating——Be careful of operating,putting rolling tensions should not too big.

The essence of common type of metallized film leads to that.——Using the “reinforced metallized film”

The cementing compound is inadaptable——Using the cementing compound which is suitable for metallized film.