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The problem and solution of powder coating finish

Views:2     Author:JIA HUA ALUMINIUM CO., LTD     Publish Time: 2020-08-24      Origin:Site

The problem and solution of powder coating finish

Jia Hua always provide the professional service to our customer. We think the quality for customer in the first position. You will see there are many rule in our produciton workshop. With the details production standard, our worker will follow the production requirement to produce the aluminum extrusion profiles for you. 


The below is the common problem we meet during the powder coating. Also, you can see the solution in the right column. 


Defect problem

ReasonSolution
Sand or particle

The powder original have sand 

Filter the powder or change the powder

The pre-treatment for aluminum profiles is not thoroughly clean up

Double check the pre-treatment processing and add QC to check the profiles after pre-treatment

The clip or transport chain is not clean.

Clean the clip or chain after every time spraying.

Recycle powder without filtered

The recycle powder should be filtered with 100-160 times before reuse it.

Spot 

The spray machine without clean after change the color

Clean the machine if change the color. And test it before mass production

Spray the several color powder in the same time

Improve the recycle system and insulate system

Lower quality of powder

Change the powder. And check the powder when the supply send to our company

The environment of powder coating workshop is not reach the requirement. There are many dust in the workshop 

Regularly clean the workshop.

Color difference

The powder original have color difference

Change the powder. And test the powder when the supply send to our company

The film is too thin or thick

Adjust the thickness of coated film

The temperature difference in difference part of the furnace

Maintain the machine

The condition of curing for powder. Such as the temperature of furnace and times

Adjust the condition of curing

Coated film is baked in many time

Improve the spraying and reduce the times of bake

The proportion of recycle powder is not stable

Improve the recycle powder proportion

Fail pre-treatment

Improve pre-treatment and double check it before powder coating

Less gloss

The condition of bake for powder is not correct. For example the temperature are too high or the time is too long

Adjust the condition of bake

The powder are polluted during spraying

Re-clean the spraying machine. And improve the management of powder coating

The proportion of recycle powder is not stable

Improve the recycle powder proportion

Recycle powder are polluted

No add the recycle powder

Coated film is baked in many time

Improve the spraying and reduce the times of bake

High gloss powder and matt powder bake in the same time

Make sure the the stable proportion and avoid the different proportion of powder bake in the same time.

Change the formula of powder which make the pollution of powder

Use stable formula for powder. Avoid the mix use for different powder

Fail pre-treatment

Improve pre-treatment and double check it before powder coating

Pinhole

The spraying environment is poor and the powder is contaminated

Strengthen the environmental management of the spraying site

The electrostatic voltage of the spray gun is too high or the distance of the workpiece is too close, causing the coating to be broken down

Lower the electrostatic voltage or adjust the distance between the spray gun and the workpieces

The coating film is too thin or too thick

Adjust coating thickness

The compressed air has high oil and water content and is not clean

Enhancing the quality of compressed air pretreatment

Unqualified pretreatment

Improve pre-treatment and double check it before powder coating


Contact us now if you have any other question about powder coating.  

CONTACT US

Jiahua Aluminum Co., Ltd.
86-0757-81802162
86-0757-81802162
fanny@jh-aluminium.com
NO.6 Guangzhao Road,Nanjiang Industrial Zone,Dasha Town,Sihui,Zhaoqing City,Guangdong province,China
Lutang Industrial Zone, Luocun, Shishan Town, Nanhai District, Foshan City, Guangdong
Province, China.

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