SMT patch red gum common problem points and solutions

根据国

  Long-term use of internal and external customer experience and their own practice, the red glue in common use element migration, element off pieces, red adhesive joint degree insufficiency, the insufficient adhesive strength after curing, ShiGong plastic instability and poor glue, red glue trailing, glue wire drawing, red plastic hollow or depression in glue, red glue leak adhesive, red plastic cement plugging and red plastic related problem solving methods summarized below:

Component migration

The causes of component deviation are:

1. Insufficient amount of red adhesive adhesive coating;

2. The laminator has abnormal impact force;

3. Low wet strength of red adhesive adhesive;

4. Placed after coating for long time;

5. Irregular shape of components,

The adhesion of the element surface to adhesives is incongruous.

Solution for component migration:

1. Adjust the coating quantity of red adhesive adhesive;

2. Reduce the patch speed,

3. Final assembly of large components;

4. Replace the red glue adhesive;

5. Finish the patch solidification within 1H after coating.

Two component drop

The reasons for the component drop are:

1. Insufficient curing strength or bubble;

2. The gelatine glue area is too small;

3. After the glue has been placed for a long time to solidify;

4. When UV curing is used, the area of glue is not enough.

5. There are mold release agents on large package components.

Resolution of component parts:

1. Confirm whether the solidification curve is correct and the anti-moisture ability of the red adhesive agent;

2. Increase the coating pressure or extend the coating time;

3. Choose a red adhesive adhesive with long effective time and appropriate adjustment of production cycle.

4. Finish the patch solidification within 1H after coating.

5. Increase the gelatine or double glue and increase the area of the gelatine.

6. Consult components supplier or replace red adhesive adhesive.

Three red adhesion insufficiency

The reasons for the deficiency of red adhesion are:

1. The area is too small;

2. The surface plastic remover is not cleaned;

Solution of insufficient red adhesion degree:

1. Using solvent cleaning and deformable agent,

Replace the adhesive with higher adhesion strength;

3. Repeat the glue at the same point.

4. Multi-point coating is adopted to improve the clearance filling capacity.

Insufficient strength after curing of four red rubber

The reasons for the lack of strength after curing of red gum are:

1. The heat curing of red adhesive adhesive is not sufficient;

2. Insufficient coating of red adhesive adhesive;

3. Bad infiltration of components.

Solution of insufficient strength after curing of red gum:

1. Setting temperature of the curing furnace;

2. Replace the lamp tube while keeping the reflective cover clean, without any oil pollution;

3. Adjust the coating quantity of red adhesive adhesive; Consulting suppliers.

5. The adhesive is unstable and cannot be adhered to in place

The reasons for the instability and adhesion are:

1. Immediately use the refrigerator;

2. Unsteady coating temperature;

3. Low pressure and short time;

4. Air bubbles in the injection tube;

5. Unstable pressure of air supply source;

6. Jam in the gums;

7. The circuit board is fixed

8. Wear of glue mouth;

9. The glue point size does not match the pin hole diameter.

The solution to the unstable and unbonded application of the application:

1. Use after full defrosting;

2. Check the temperature control device;

3. Appropriate adjustment of the pressure and time;

4. Centrifugal defoaming devices are used in the assembly.

5. Check the air source pressure, filter the qi, sealing ring;

6. Wash the gums;

7. Consult board suppliers;

8. Replace the glue nozzle;

9. Increase the size of glue point or change the glue nozzle with smaller inner diameter.

Six red glue tow tails also known as red adhesive drawing

The reason for the drag-tail is also known as red adhesive drawing.

1. The inner diameter of the rubber nozzle is too small;

2. Red adhesive adhesive coating pressure is too high:

3. The gelatine mouth of the injection tube is too close to the PCB board;

4. Expired or poor quality of red adhesive adhesive;

5. High viscosity of red adhesive adhesive;

6. The red adhesive adhesive is used immediately after being removed from the refrigerator;

7. The coating temperature of red adhesive adhesive is unstable;

8. Excessive amount of red adhesive adhesive coating;

9. The red adhesive adhesive room temperature is too long.

Solution of red glue tow tail and red adhesive drawing

1. Replace the inner diameter glue mouth;

2. Reduce the coating pressure of red adhesive adhesive;

3. Reduce the spacing between the red gels and PCB boards

4. Select "stop" highly appropriate glue mouth;

5. Check the expiration and storage temperature of red adhesive adhesive;

6. Choose red adhesive adhesive with low viscosity;

7. After full defrosting of red adhesive adhesive;

8. Check the temperature control device;

9. Adjust the amount of red adhesive adhesive coating;

10. Preserve the product red adhesive using thawed refrigeration.

Seven red gum cavity or red gum depression

Causes of red gum cavity or red gum depression are:

1. There are cured red adhesive adhesives on the inner wall of the injection tube.

2. There are foreign objects or bubbles in the inner wall of the injection tube;

3. The syringe is not clean.

Solution to the red gum hole or red gum depression:

1. Replace the injection tube or clean it;

2. Eliminate air bubbles in the injection cylinder.

3. Small package with needle cartridge.

Eight red adhesive leakage

The causes of red rubber leakage are:

1. Air bubbles in red adhesive adhesive.

2. Red adhesive adhesives mixed with impurities.

Solution of red glue leakage:

1. High-speed desicking treatment;

2. Small package with needle cartridge.

9 red glue gum mouth jam

The reasons for the jam are:

1. Cross-contamination of incompatible red glue glue;

2. Not completely clean in the needle hole;

3. The anaerobic curing of the residual adhesive in the pinhole occurred;

The size of the red glue adhesive particle is uneven.

The solution to the congestion of the red glue mouth:

1. Replace the glue nozzle or clean the needle hole and seal ring;

2. Clean the gums, and pay attention not to squeeze the cured glue into the mouth (such as the beginning and end of each glue);

3. Non-use of brass or copper point gummy mouth (propionate adhesive is in essence anaerobic curing characteristics);

4. Use red adhesive adhesive with fine particle size.