The use of foreign sealant and analysis of common problems (2)

Fourth, the analysis of common problems in the use of sealant

Regarding the common problems of sealant in use, we have summarized the following points. In practical applications, other problems may be encountered, and this table can also be studied.

Analysis of common problems in the use of sealant

problem

phenomenon

the reason

Possible solution

Insufficient glue injection

The amount of glue does not meet the process requirements or requirements

1, the air pressure is small

1, increase the air pressure

2, the nozzle is smaller

2, with a larger nozzle

3, the nozzle thimble is not open

3, lift the thimble

The amount of glue injected is too large

The amount of glue exceeds the process requirements or requirements

1, the air pressure is large

1, reduce air pressure

2, the nozzle is larger

2, with a smaller nozzle

3, the nozzle thimble is too small

3. Press the thimble down

Trailing

The sealant is slightly too much inside the lid

Inappropriate cutting

1. Put the thimble into the nozzle

2. Reduce the nozzle hole and increase the air pressure

3. Increase the "post rotation" of the cover end

4, use a harder closed top spring

5. Replace the cam of the nozzle opening

Face

When the glue is injected, the nozzle is in contact with the sealant on the cover

The nozzle is too low

1. Raise the nozzle

Spill

The sealant splashed out of the ditch

1. The nozzle position is too high

1. Lower the nozzle

2, nozzle nozzle is too large

2, use a nozzle with a smaller nozzle

Missing

Insufficient glue injection for a whole week or two weeks

1. The lobe of the nozzle cam

1, increase the lobe

2, the air pressure is too low

2, increase the air pressure

3. The cover end slides on the chuck

3. Change the cooperation between the lid and the chuck

4, the pressure pad is stuck

4, make the pressure pad can rotate freely

overlapping

Injection is more than one week or two weeks

1. The lobe of the nozzle cam

1, reduce the lobes

2, high air pressure

2, reduce air pressure

Film leak

Some of the coating ditch is not coated

1, low air pressure

1, increase air pressure

2, the chuck speed is low

2, increase the chuck speed

accumulation

Sealant is stacked in the nozzle

(see solution)

1. Put the thimble into the nozzle

2. Raise the nozzle (when the surface is broken)

3. Change the taper angle of the thimble tip to reduce the contact circle between the thimble and the nozzle.

Drop

There is a sealant in the middle of the lid

1. When the end of the lid is separated from the chuck, the tilt occurs and the nozzle is touched.

1. Extend the presser foot to the nozzle

2, the nozzle is not closed

2. Put the thimble into the nozzle or replace it.

3, nozzle opening cam rough

3, replace the cam

Film thickness is wrong

Inconsistent upper and lower thickness

1. The nozzle parts are worn or loose

1. Fasten the parts

overflow

Sealant overflows from the trench

(see solution)

1, reduce air pressure

2, reduce the chuck speed

3, increase the size of the ditch

4. If the overflow is due to overlap, reduce the cam angle

Bubble

Air bubbles appear on the dry pad

Improper drying process

1. Increase or decrease the drying temperature

split

Dry lining bubbles

Improper drying process

1. Increase the drying temperature and extend the drying cycle

The film is too thin

At the "flat" film

1, poor lubrication

1. Try various stretching (calendering) lubricants or emulsions

2, the amount of glue injection is insufficient

2, (see above to solve the small amount of coating film)

Extrusion

The sealant oozes from the crimp joint when crimping

1. Improper drying process

1. Increase drying temperature and extend drying cycle

2, the amount of glue injection is too large

2, (see above to solve the small amount of coating film

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