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The common problems of film coating machine are.
Uneven film thickness, pitting on the surface of the film, round pits, small bubbles on the surface of the film, unstable film, broken film, "orange peel" film, uneven film gloss and other phenomena.
So how to solve these problems? Nanjing Sumino Seiko proposed the following methods
(a) uv shower paint shower paint film thickness is not uniform
Performance phenomenon: the workpiece left and right sides of the front and rear coating amount is not uniform
Analysis of the causes
1. left and right sides of the curtain machine knife gap is not consistent
2. wear and tear of the drenching knife or blockage of miscellaneous live matter
3. the drenching paint heating has not yet reached a stable and uniform
4. inconsistency in height between the left and right sides of the drencher cutter head
5. the table of the drencher is not level.
Suggested solutions
1. Adjust the cutter head so that the left and right cutter heads are the same.
2. Grind the lower cutter and remove debris to strengthen the filtering capacity in the drencher barrel.
3. Heat the drenching barrel and turn on the drencher lacquer circulation pump to continuously circulate heating and filtering (pre-heating and filtering for at least 5-8 hours).
(pre-heating and filtering for at least 5-8 hours)
4. Adjust the lifting screw of the drencher head so that the cutter head is at the same level.
5. Adjust the four corners of the drenching machine table support high and low
(B) Small pockmarks on the surface of the lacquer film
Performance phenomenon: small pitting on the surface of the dripping film
Analysis of the causes
1. improper formulation of UV paint or storage temperature is too high, storage time is too long, leakage of ultraviolet light exposure
2. Pre-curing, resulting in small particles of gel
3. small shavings, sawdust, dust pollution paint film, improper dust removal caused by.
Suggested treatment methods
1. choose a UV paint with appropriate formula and stable performance.
2. Store the paint on the floor at high temperature and under strong UV light, and do not store it for more than 3 months. 3.
3. Clean the environment around the paint line as much as possible and do a good job of dust removal in the workshop, production line and board surface.
(3) Small bubbles and pinholes on the surface of the lacquer film
Phenomenon: small bubbles and pinholes on the surface of the lacquer film
Analysis of the causes
1. poor defoaming performance of UV lacquer itself.
2. The first sealer does not fill the capillary pores sufficiently, leaving small gaps, the air in the gaps is heated by the hot paint, curing machine and flow machine and then expands and escapes.
The air in the gap is heated by the hot paint, curing machine and flow machine and then expands and escapes.
3. small bubbles are wrapped in the paint film is cured, forming small bubbles, small pockmarks; large bubbles are heated to burst open to form pinholes or
Small round pits.
4. Insufficient buffering device in the oil bath of the drencher, the paint flowing too fast will cause bubbles to rise
5. The height between the shower head and the working surface is too large
6. The difference in height between the oil outlet of the drencher and the paint drum is too great.
Suggested solutions.
1. Use a UV top coat with good defoaming properties.
2. The first filler sealer must be fully sealed, do not leave a small gap. 3.
3. Avoid working with paint, curing machines and levelling machines at high temperatures, resulting in high substrate temperatures (no more than 60¡ãC), which can cause air to expand and escape.
), allowing air to expand and escape.
4. It is recommended that the new scraping putty is used to fill in before the first primer coat.
5. Keep the drenching head at a distance of about 10cm from the working table
6. Lower the distance between the drenching head and the work and reduce the height difference between the oil bath outlet and the paint drum
(iv) Small round pits of different sizes on the surface of the paint film
Performance phenomenon: The surface of the paint film is distributed with small round pits of different sizes
Analysis of the causes:
1. the paint itself is not compatible.
2. the paint is mixed with incompatible substances, such as oil, etc.
3. the surface of the workpiece is contaminated, dust removal is not clean.
Suggested treatment methods: 1:
1. Use a UV paint with good compatibility. 2.
2. Avoid mixing in incompatible substances such as oil and water.
3. Thoroughly remove dust and avoid contamination by other substances, such as solvents, etc.
(E) Unstable paint curtain, broken film
Performance phenomenon: irregular tearing of the paint curtain
Analysis of the causes
1. improper formulation of paint, the year is too low, the paint temperature is too high, the curtain tension becomes small.
2. The gap between the knives is too small and the tension decreases to the point where the film breaks.
3. The knife opening is blocked by contaminants (filter failure) The paint is contaminated and the filter fails
Suggested treatment
1. Use a suitable formulation of paint with low viscosity and low paint temperature requirements.
2. Adjust the knife gap to a suitable position.
3. Remove contaminants from the cutter and filter and restore function.
4. Remove contaminants and restore the filter function.
(F) The paint film is "orange peel"
Performance phenomenon: paint film appears "orange peel wrinkle" appearance
Analysis of the causes
1. poor processing accuracy of the work piece, sanding is not complete.
2. workpiece bending and deformation, unevenness, not easy to sand the whole surface, paint to.
3. Insufficient primer treatment.
4. The viscosity of the paint is high and the leveling is not good.
5. The coating temperature has not yet reached uniformity and stability.
6. The thickness of the drench coat is too thick and not easy to level.
Suggested solutions
1. Select a qualified workpiece and re-sand it smoothly.
2. Remove deformed and uneven workpieces.
3. Increase the primer (including sanding and curing) by 1 to 2 coats.
4. Choose a UV lacquer with low viscosity and good leveling. 5.
5. Extend the heating and cycling time to make the viscosity even and stable. 6.
6. Control the thickness of the lacquer at 90-100g/m2.
(G) Uneven glossiness of UV top coat
Performance phenomenon: the same or different pieces of floor gloss is not uniform
Analysis of the causes
1. uneven mixing of matting powder and super wear-resistant powder in the paint.
2. Uneven coating volume. 3.
3. Insufficient levelling, non-uniform curing of the paint
Suggested solutions
1. Mix well.
2. Consistent and uniform coating volume.
3. Extend the levelling time and control the uniform curing of the coating.
Maintenance and care of the film drencher
1. Keep all guide rollers and silicone rollers on the surface of the machine clean.
2. Keep the inside of the drying oven clean and clean the filter and strainer of the suction machine.
3. Check carefully that the temperature control device of the film drencher is intact after use.
4. At the end of the work, the glue tray, the anilox roller, the silicone roller and the back pressure roller must be cleaned, otherwise they will directly affect the dose of glue applied and cause the product quality to be unqualified.
5. Clean and wrap the silicone rollers and store them in the air.
6. Check whether the vacuum packing machine is working normally, and do not allow the screw and barrel to rotate empty.
The following is the LDPE 3-in-1 laminating machine designed and produced by Nanjing Sumino Seiko, with high efficient capacity, advanced appearance and fully automatic standing, which can be applied to single-sided PE coated release paper, digital photo paper, paper cup paper, etc.
Uneven film thickness, pitting on the surface of the film, round pits, small bubbles on the surface of the film, unstable film, broken film, "orange peel" film, uneven film gloss and other phenomena.
So how to solve these problems? Nanjing Sumino Seiko proposed the following methods
(a) uv shower paint shower paint film thickness is not uniform
Performance phenomenon: the workpiece left and right sides of the front and rear coating amount is not uniform
Analysis of the causes
1. left and right sides of the curtain machine knife gap is not consistent
2. wear and tear of the drenching knife or blockage of miscellaneous live matter
3. the drenching paint heating has not yet reached a stable and uniform
4. inconsistency in height between the left and right sides of the drencher cutter head
5. the table of the drencher is not level.
Suggested solutions
1. Adjust the cutter head so that the left and right cutter heads are the same.
2. Grind the lower cutter and remove debris to strengthen the filtering capacity in the drencher barrel.
3. Heat the drenching barrel and turn on the drencher lacquer circulation pump to continuously circulate heating and filtering (pre-heating and filtering for at least 5-8 hours).
(pre-heating and filtering for at least 5-8 hours)
4. Adjust the lifting screw of the drencher head so that the cutter head is at the same level.
5. Adjust the four corners of the drenching machine table support high and low
(B) Small pockmarks on the surface of the lacquer film
Performance phenomenon: small pitting on the surface of the dripping film
Analysis of the causes
1. improper formulation of UV paint or storage temperature is too high, storage time is too long, leakage of ultraviolet light exposure
2. Pre-curing, resulting in small particles of gel
3. small shavings, sawdust, dust pollution paint film, improper dust removal caused by.
Suggested treatment methods
1. choose a UV paint with appropriate formula and stable performance.
2. Store the paint on the floor at high temperature and under strong UV light, and do not store it for more than 3 months. 3.
3. Clean the environment around the paint line as much as possible and do a good job of dust removal in the workshop, production line and board surface.
(3) Small bubbles and pinholes on the surface of the lacquer film
Phenomenon: small bubbles and pinholes on the surface of the lacquer film
Analysis of the causes
1. poor defoaming performance of UV lacquer itself.
2. The first sealer does not fill the capillary pores sufficiently, leaving small gaps, the air in the gaps is heated by the hot paint, curing machine and flow machine and then expands and escapes.
The air in the gap is heated by the hot paint, curing machine and flow machine and then expands and escapes.
3. small bubbles are wrapped in the paint film is cured, forming small bubbles, small pockmarks; large bubbles are heated to burst open to form pinholes or
Small round pits.
4. Insufficient buffering device in the oil bath of the drencher, the paint flowing too fast will cause bubbles to rise
5. The height between the shower head and the working surface is too large
6. The difference in height between the oil outlet of the drencher and the paint drum is too great.
Suggested solutions.
1. Use a UV top coat with good defoaming properties.
2. The first filler sealer must be fully sealed, do not leave a small gap. 3.
3. Avoid working with paint, curing machines and levelling machines at high temperatures, resulting in high substrate temperatures (no more than 60¡ãC), which can cause air to expand and escape.
), allowing air to expand and escape.
4. It is recommended that the new scraping putty is used to fill in before the first primer coat.
5. Keep the drenching head at a distance of about 10cm from the working table
6. Lower the distance between the drenching head and the work and reduce the height difference between the oil bath outlet and the paint drum
(iv) Small round pits of different sizes on the surface of the paint film
Performance phenomenon: The surface of the paint film is distributed with small round pits of different sizes
Analysis of the causes:
1. the paint itself is not compatible.
2. the paint is mixed with incompatible substances, such as oil, etc.
3. the surface of the workpiece is contaminated, dust removal is not clean.
Suggested treatment methods: 1:
1. Use a UV paint with good compatibility. 2.
2. Avoid mixing in incompatible substances such as oil and water.
3. Thoroughly remove dust and avoid contamination by other substances, such as solvents, etc.
(E) Unstable paint curtain, broken film
Performance phenomenon: irregular tearing of the paint curtain
Analysis of the causes
1. improper formulation of paint, the year is too low, the paint temperature is too high, the curtain tension becomes small.
2. The gap between the knives is too small and the tension decreases to the point where the film breaks.
3. The knife opening is blocked by contaminants (filter failure) The paint is contaminated and the filter fails
Suggested treatment
1. Use a suitable formulation of paint with low viscosity and low paint temperature requirements.
2. Adjust the knife gap to a suitable position.
3. Remove contaminants from the cutter and filter and restore function.
4. Remove contaminants and restore the filter function.
(F) The paint film is "orange peel"
Performance phenomenon: paint film appears "orange peel wrinkle" appearance
Analysis of the causes
1. poor processing accuracy of the work piece, sanding is not complete.
2. workpiece bending and deformation, unevenness, not easy to sand the whole surface, paint to.
3. Insufficient primer treatment.
4. The viscosity of the paint is high and the leveling is not good.
5. The coating temperature has not yet reached uniformity and stability.
6. The thickness of the drench coat is too thick and not easy to level.
Suggested solutions
1. Select a qualified workpiece and re-sand it smoothly.
2. Remove deformed and uneven workpieces.
3. Increase the primer (including sanding and curing) by 1 to 2 coats.
4. Choose a UV lacquer with low viscosity and good leveling. 5.
5. Extend the heating and cycling time to make the viscosity even and stable. 6.
6. Control the thickness of the lacquer at 90-100g/m2.
(G) Uneven glossiness of UV top coat
Performance phenomenon: the same or different pieces of floor gloss is not uniform
Analysis of the causes
1. uneven mixing of matting powder and super wear-resistant powder in the paint.
2. Uneven coating volume. 3.
3. Insufficient levelling, non-uniform curing of the paint
Suggested solutions
1. Mix well.
2. Consistent and uniform coating volume.
3. Extend the levelling time and control the uniform curing of the coating.
Maintenance and care of the film drencher
1. Keep all guide rollers and silicone rollers on the surface of the machine clean.
2. Keep the inside of the drying oven clean and clean the filter and strainer of the suction machine.
3. Check carefully that the temperature control device of the film drencher is intact after use.
4. At the end of the work, the glue tray, the anilox roller, the silicone roller and the back pressure roller must be cleaned, otherwise they will directly affect the dose of glue applied and cause the product quality to be unqualified.
5. Clean and wrap the silicone rollers and store them in the air.
6. Check whether the vacuum packing machine is working normally, and do not allow the screw and barrel to rotate empty.
The following is the LDPE 3-in-1 laminating machine designed and produced by Nanjing Sumino Seiko, with high efficient capacity, advanced appearance and fully automatic standing, which can be applied to single-sided PE coated release paper, digital photo paper, paper cup paper, etc.