(3) Injury caused by India
1. Frame printing (1) Pattern: The fabric has a regular, color-changing straight strip color pattern in the weft direction of the fabric, and the spacing of the flaws is the same as the width of the frame. This is one of the common defects in cold platen printing.
(2) Cause:
1 The color paste is stuck on the bottom edge of the flower frame.
2 There is a gap in the frame of the flower frame, causing the colorant to leak.
3 Scraper blade, angle, etc. do not meet the requirements and the slurry layer is too thick.
4 Continuous squeegee printing, the color paste was not dried after the front cover printing, and the rear cover was printed again.
(3) Preventive measures:
1 Keep the bottom of the frame clean and dry. Use a tilted (0.5cm) frame at the bottom to effectively reduce the width of the frame print.
2 We must keep it firmly.
3 Adjust the blade, angle, speed, pressure and other indicators of the blade to make the slurry clean.
4 Pull as large a spacing as possible.
2. Take off (pressure paste)
(1) Morphology: Some patterns were pressed into a shape like pores, with uneven shades and unclear outlines.
(2) Cause:
1 Continuous squeegee printing, the first edition of flower paste was not dried, and the second edition was pressed again to crush the first edition of flower pulp. In particular, it should occur at the interface of the two sets of flowers:
In one case, pressure paste occurs when the board is pressed (the same pattern presses itself);
Another situation is when the previous version is overprinted. The more the number of registrations, the more severe the paste becomes.
2 The scraper squeegee index is not appropriate, the slurry is not net, and the slurry layer is too thick.
(3) Preventive measures:
1 Adjust the squeegee to increase the squeegee pressure and the squeegee angle to ensure that the slurry is thin and the pulp is clean.
2 Pull the distance between the models and add a hairdryer and drying device.
3 If possible, reverse the pattern printing order and reduce the number of pressures.
4 It can reduce the solid content of the original paste or change the type of original paste to reduce the thickness of the paste.
5 The number of black and white manuscripts can be reduced without changing the spirit of the original manuscript.
3. Scrape (1) Morphology: In the light-colored pattern, a dark paste or a different color paste is introduced, resulting in color wilt. It is the most common defect in screen printing.
(2) Cause:
1 The dark-colored pattern has a large surface area, which gives the pulp a thick layer. When scraped, it enlarges the area and enters the light-colored pattern edge.
2 Squeegee pressure is too high, the dark color flower into the light-colored pattern.
3 Inaccurately blocked flowers.
(3) Preventive measures:
1 Under the premise of not affecting the pattern and the complex color, the order of printing patterns is reversed.
2 Replace the scraper or adjust the pressure of the scraper to make the colorant cleaner.
3 According to the size of the printing fabric, the size of the flower is blocked.
4 Pull the distance between the printed patterns.
4. Infiltration (1) Morphology: Dark-colored patterns penetrate into light-colored patterns.
(2) Cause:
1 The front set of dark-colored flower paste is covered with light-colored pulp after it is dried, causing deep color infiltration.
2 The color paste is too thin to reach the viscosity.
(3) Preventive measures:
1 It can change the printing order of the front and rear printing plates without affecting the printing effect.
2 Pull away the spacing of flower patterns.
3 The solid content of the original paste and the viscosity of the color paste should be moderate.
5. Trailer (flash)
(1) Morphology: The side of the flower pattern has an undesirable color or frizziness on one side and is not clear.
(2) Cause:
1 The silk is not firm, and there is friction between the silk surface and the pattern when the belt runs.
2 The rules on the flowers were not settled, and the floral version was moved.
3 When printing by hand, the flower plate moves without lifting, and the flower paste is peeled off.
(3) Preventive measures:
1 Check the surface of the guide tape for stickiness. If the adhesive paste fails, wash it and recoat it in time to ensure that it is flat, straight and firm.
2 The rules on the flower plate should be fixed to ensure that the flower plate does not move and control the speed of the lifting frame during printing.
3 When printing by hand, it is necessary to form a certain angle (usually 10°) from the starting point, and it is necessary to move the foot after the flower version.
6. Double stems (1) Morphology: The edges of the pattern show double lines, sometimes one of them is not very clear.
(2) Cause:
1 The screen strain of the screen is not sufficient, and it rebounds when the crane lifts.
2 The stencil prints on the same machine are not synchronized.
3 Flower version will not die, back and forth.
(3) Preventive measures:
1 The silk web must be tight, the warp and weft pressures should be up to standard, and the stretched nets of the same draft must have the same conditions.
2 Adjust the squeegee parameters so that the front and back squeegees run synchronously.
3 Stipulate the rules of the fixed edition, rules and regulations, wear blocks should be promptly replaced.
7. Thick and thin stems (1) Morphology: The mud spots and lines in the flower pattern are uneven.
(2) Cause:
1 There are thick and thin floral patterns.
2 The two blades in the double blade scraper do not match or the blade pressure does not match.
(3) Preventive measures:
1 Carefully check the floral pattern, carry out the test, and find that the thick and thin stems are promptly repaired and replaced.
2 Keep the indicators of the double-bladed scraper consistent.
8. Bend (flower oblique)
(1) Form: Satin weft pattern, grid skew or wavy.
(2) Cause:
1 Into the silk or plaster is not correct.
2 Semi-products are weft-sloped. After printing, the flowers are obliquely arranged.
3 The head is not straight.
(3) Preventive measures:
1 Into the silk should always pay attention to, found that is not correct, timely adjustment of automatic weft device to ensure its normal work.
2 When the semi-finished product is already slanted, it must be re-arranged before printing, especially when printing geometric patterns.
3 Strictly perform sewing head operation requirements.
9. Bubbles (1) Morphology: The pattern on the surface of the silk presents lighter vesicles. Most bubbles appear on both sides of the silk surface.
(2) Cause:
1 The thick edges of the blanks are too thick or uneven on both sides of the platen.
2 Poor permeability of the colorant or poor hygroscopicity of the silk fabric.
3 The frame is uneven.
4 When the squeegee is printing, the pressure of the squeegee is insufficient or the shape and angle of the blade are improper.
(3) Preventive measures:
1 If you can choose one, choose a small-side-thick green silk block pattern.
2 For the easily foamable paste, add the appropriate amount of penetrant or defoamer.
3 The frame must be level.
4 According to the size of the pattern surface, a reasonable choice of scraper blade and squeegee pressure, angle.
5 For fabrics that are easy to foam, they can be rolled, stretched and then printed.
10. Paste (1) Morphology: There should be irregular colors on the edge of the silk.
(2) Cause:
1 Spilled on the flower plate too much, splashed and pressed onto the edge of the silk by the latter.
2 The flower block is not well blocked and the gap is too large, especially for large areas.
(3) Preventive measures:
1 Add less pulp to the printing and diligence.
2 Control plugging gaps.
11. Flower marks (1) Morphology: The reverse side of the fabric shows the same pattern as the front, affecting the front appearance of the fabric.
(2) Cause:
1 The conduction band or table is not cleaned, and the dirty fabric is on the opposite side, and then it is fixed on the fabric by steaming.
2 The water washing device malfunctions, causing the conduction band to carry water.
(3) Preventive method: Check whether the washing device is working properly (especially the scraper), solve the problem and solve it in time to ensure that the guide belt is clean.
12. Color crease and white crease (1) Morphology: Irregular dark-colored streak on the flower type or ground color, ie colored crease; irregular pattern or unprinted streak on flowers or ground colors. That is, white wrinkles.
(2) Cause:
1 The silk is uneven and wrinkled.
2 The silk is not firm, and the silk shrinks and wrinkles.
3 The blank silk is loose or tight, and the silk is wrinkled and overlapped, resulting in white creases after printing.
4 The seams of the blanks are not tight, causing head creases, resulting in discounts in the middle of the fabric.
(3) Preventive measures:
1 Adjust the cloth feeding device in time to ensure that the blank is flat and straight into the guide belt.
2 Regularly paste cloth on the guide belt to ensure that the paste is firm.
13. Squeegee (1) Morphology: Regular, dark, straight stripes on the surface of the sliver.
(2) Cause: The blade of the doctor blade is not straight and has a notch.
(3) Prevention method: The blade of the scraper must be smooth and dry.
14. Back to the serigraphy (1) Form: The surface of the sliver has thin, regular dark lines.
(2) Cause:
1 When the squeegee is printed, the slurry is not net.
2 Color paste contains impurities.
3 The color paste is too large, causing dragging.
4 Too much colorant.
5 blade edge, angle discomfort.
(3) Preventive measures:
1 Select the scraper according to the pattern to make it clean.
2 The viscosity of the color paste should be moderate, and the original paste with small threading property can be put into use to reduce dragging. The color paste should be filtered before use.
3 Add less pulp and work.
15. The depth of the version (1) Form: There are shades of color on the surface of the silk surface. It usually appears in hand-printed products.
(2) Reasons: Inconsistent pressure between plates or dry and uneven fabrics.
(3) Preventive method: The silk paste is well-printed and can be printed after drying. When squeegeing, the left and right hand pressure should be uniform, and the squeegee angle should be the same.
16. Skip version depth (1) Form: There is a difference in the shade between the plate and the plate. It usually appears in hand-printed products.
(2) Cause:
1 During manual printing, replace or halfway through the paste.
2 The platen temperature is not constant.
3 Satin is not dried on the silk.
(3) Preventive measures:
1 Do a good job in prepress preparation. The person will complete the color printing, and shall not change or refill the pulp in the middle.
2 The console board temperature is basically constant.
3 stick silk dry and then print.
1. Frame printing (1) Pattern: The fabric has a regular, color-changing straight strip color pattern in the weft direction of the fabric, and the spacing of the flaws is the same as the width of the frame. This is one of the common defects in cold platen printing.
(2) Cause:
1 The color paste is stuck on the bottom edge of the flower frame.
2 There is a gap in the frame of the flower frame, causing the colorant to leak.
3 Scraper blade, angle, etc. do not meet the requirements and the slurry layer is too thick.
4 Continuous squeegee printing, the color paste was not dried after the front cover printing, and the rear cover was printed again.
(3) Preventive measures:
1 Keep the bottom of the frame clean and dry. Use a tilted (0.5cm) frame at the bottom to effectively reduce the width of the frame print.
2 We must keep it firmly.
3 Adjust the blade, angle, speed, pressure and other indicators of the blade to make the slurry clean.
4 Pull as large a spacing as possible.
2. Take off (pressure paste)
(1) Morphology: Some patterns were pressed into a shape like pores, with uneven shades and unclear outlines.
(2) Cause:
1 Continuous squeegee printing, the first edition of flower paste was not dried, and the second edition was pressed again to crush the first edition of flower pulp. In particular, it should occur at the interface of the two sets of flowers:
In one case, pressure paste occurs when the board is pressed (the same pattern presses itself);
Another situation is when the previous version is overprinted. The more the number of registrations, the more severe the paste becomes.
2 The scraper squeegee index is not appropriate, the slurry is not net, and the slurry layer is too thick.
(3) Preventive measures:
1 Adjust the squeegee to increase the squeegee pressure and the squeegee angle to ensure that the slurry is thin and the pulp is clean.
2 Pull the distance between the models and add a hairdryer and drying device.
3 If possible, reverse the pattern printing order and reduce the number of pressures.
4 It can reduce the solid content of the original paste or change the type of original paste to reduce the thickness of the paste.
5 The number of black and white manuscripts can be reduced without changing the spirit of the original manuscript.
3. Scrape (1) Morphology: In the light-colored pattern, a dark paste or a different color paste is introduced, resulting in color wilt. It is the most common defect in screen printing.
(2) Cause:
1 The dark-colored pattern has a large surface area, which gives the pulp a thick layer. When scraped, it enlarges the area and enters the light-colored pattern edge.
2 Squeegee pressure is too high, the dark color flower into the light-colored pattern.
3 Inaccurately blocked flowers.
(3) Preventive measures:
1 Under the premise of not affecting the pattern and the complex color, the order of printing patterns is reversed.
2 Replace the scraper or adjust the pressure of the scraper to make the colorant cleaner.
3 According to the size of the printing fabric, the size of the flower is blocked.
4 Pull the distance between the printed patterns.
4. Infiltration (1) Morphology: Dark-colored patterns penetrate into light-colored patterns.
(2) Cause:
1 The front set of dark-colored flower paste is covered with light-colored pulp after it is dried, causing deep color infiltration.
2 The color paste is too thin to reach the viscosity.
(3) Preventive measures:
1 It can change the printing order of the front and rear printing plates without affecting the printing effect.
2 Pull away the spacing of flower patterns.
3 The solid content of the original paste and the viscosity of the color paste should be moderate.
5. Trailer (flash)
(1) Morphology: The side of the flower pattern has an undesirable color or frizziness on one side and is not clear.
(2) Cause:
1 The silk is not firm, and there is friction between the silk surface and the pattern when the belt runs.
2 The rules on the flowers were not settled, and the floral version was moved.
3 When printing by hand, the flower plate moves without lifting, and the flower paste is peeled off.
(3) Preventive measures:
1 Check the surface of the guide tape for stickiness. If the adhesive paste fails, wash it and recoat it in time to ensure that it is flat, straight and firm.
2 The rules on the flower plate should be fixed to ensure that the flower plate does not move and control the speed of the lifting frame during printing.
3 When printing by hand, it is necessary to form a certain angle (usually 10°) from the starting point, and it is necessary to move the foot after the flower version.
6. Double stems (1) Morphology: The edges of the pattern show double lines, sometimes one of them is not very clear.
(2) Cause:
1 The screen strain of the screen is not sufficient, and it rebounds when the crane lifts.
2 The stencil prints on the same machine are not synchronized.
3 Flower version will not die, back and forth.
(3) Preventive measures:
1 The silk web must be tight, the warp and weft pressures should be up to standard, and the stretched nets of the same draft must have the same conditions.
2 Adjust the squeegee parameters so that the front and back squeegees run synchronously.
3 Stipulate the rules of the fixed edition, rules and regulations, wear blocks should be promptly replaced.
7. Thick and thin stems (1) Morphology: The mud spots and lines in the flower pattern are uneven.
(2) Cause:
1 There are thick and thin floral patterns.
2 The two blades in the double blade scraper do not match or the blade pressure does not match.
(3) Preventive measures:
1 Carefully check the floral pattern, carry out the test, and find that the thick and thin stems are promptly repaired and replaced.
2 Keep the indicators of the double-bladed scraper consistent.
8. Bend (flower oblique)
(1) Form: Satin weft pattern, grid skew or wavy.
(2) Cause:
1 Into the silk or plaster is not correct.
2 Semi-products are weft-sloped. After printing, the flowers are obliquely arranged.
3 The head is not straight.
(3) Preventive measures:
1 Into the silk should always pay attention to, found that is not correct, timely adjustment of automatic weft device to ensure its normal work.
2 When the semi-finished product is already slanted, it must be re-arranged before printing, especially when printing geometric patterns.
3 Strictly perform sewing head operation requirements.
9. Bubbles (1) Morphology: The pattern on the surface of the silk presents lighter vesicles. Most bubbles appear on both sides of the silk surface.
(2) Cause:
1 The thick edges of the blanks are too thick or uneven on both sides of the platen.
2 Poor permeability of the colorant or poor hygroscopicity of the silk fabric.
3 The frame is uneven.
4 When the squeegee is printing, the pressure of the squeegee is insufficient or the shape and angle of the blade are improper.
(3) Preventive measures:
1 If you can choose one, choose a small-side-thick green silk block pattern.
2 For the easily foamable paste, add the appropriate amount of penetrant or defoamer.
3 The frame must be level.
4 According to the size of the pattern surface, a reasonable choice of scraper blade and squeegee pressure, angle.
5 For fabrics that are easy to foam, they can be rolled, stretched and then printed.
10. Paste (1) Morphology: There should be irregular colors on the edge of the silk.
(2) Cause:
1 Spilled on the flower plate too much, splashed and pressed onto the edge of the silk by the latter.
2 The flower block is not well blocked and the gap is too large, especially for large areas.
(3) Preventive measures:
1 Add less pulp to the printing and diligence.
2 Control plugging gaps.
11. Flower marks (1) Morphology: The reverse side of the fabric shows the same pattern as the front, affecting the front appearance of the fabric.
(2) Cause:
1 The conduction band or table is not cleaned, and the dirty fabric is on the opposite side, and then it is fixed on the fabric by steaming.
2 The water washing device malfunctions, causing the conduction band to carry water.
(3) Preventive method: Check whether the washing device is working properly (especially the scraper), solve the problem and solve it in time to ensure that the guide belt is clean.
12. Color crease and white crease (1) Morphology: Irregular dark-colored streak on the flower type or ground color, ie colored crease; irregular pattern or unprinted streak on flowers or ground colors. That is, white wrinkles.
(2) Cause:
1 The silk is uneven and wrinkled.
2 The silk is not firm, and the silk shrinks and wrinkles.
3 The blank silk is loose or tight, and the silk is wrinkled and overlapped, resulting in white creases after printing.
4 The seams of the blanks are not tight, causing head creases, resulting in discounts in the middle of the fabric.
(3) Preventive measures:
1 Adjust the cloth feeding device in time to ensure that the blank is flat and straight into the guide belt.
2 Regularly paste cloth on the guide belt to ensure that the paste is firm.
13. Squeegee (1) Morphology: Regular, dark, straight stripes on the surface of the sliver.
(2) Cause: The blade of the doctor blade is not straight and has a notch.
(3) Prevention method: The blade of the scraper must be smooth and dry.
14. Back to the serigraphy (1) Form: The surface of the sliver has thin, regular dark lines.
(2) Cause:
1 When the squeegee is printed, the slurry is not net.
2 Color paste contains impurities.
3 The color paste is too large, causing dragging.
4 Too much colorant.
5 blade edge, angle discomfort.
(3) Preventive measures:
1 Select the scraper according to the pattern to make it clean.
2 The viscosity of the color paste should be moderate, and the original paste with small threading property can be put into use to reduce dragging. The color paste should be filtered before use.
3 Add less pulp and work.
15. The depth of the version (1) Form: There are shades of color on the surface of the silk surface. It usually appears in hand-printed products.
(2) Reasons: Inconsistent pressure between plates or dry and uneven fabrics.
(3) Preventive method: The silk paste is well-printed and can be printed after drying. When squeegeing, the left and right hand pressure should be uniform, and the squeegee angle should be the same.
16. Skip version depth (1) Form: There is a difference in the shade between the plate and the plate. It usually appears in hand-printed products.
(2) Cause:
1 During manual printing, replace or halfway through the paste.
2 The platen temperature is not constant.
3 Satin is not dried on the silk.
(3) Preventive measures:
1 Do a good job in prepress preparation. The person will complete the color printing, and shall not change or refill the pulp in the middle.
2 The console board temperature is basically constant.
3 stick silk dry and then print.
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