The defects of flat screen printing are ever-changing. People summarize it into several types and inspect the finished product. When distinguishing and naming it according to the phenomenon. In fact, flaws rarely occur in recurrence. Although there are the same phenomena, they are not necessarily the same cause. Here we mainly analyze common and easy-to-be defects, analyze a possibility of defects, and provide an idea to analyze defects for reference.
1Blush
<span style="margin: 0px; padding: 0px; max-width: 100%; font-family: Microsoft Yahei; box-sizing: border-box ! Its phenomenon is manifested as unclear outline of the flower shape, blurred contact surface of the complex color or paste on the edge. According to the principle that only when there is pressure, wet cover wet prints When the next version will be pressed on the previous version, the number of times the interface is pressed severely.
To overcome this state, first, you must choose a suitable scraper (hardness), and the scraping and printing and picking pulp must be clean; if conditions permit, the distance between the plate is set. Heat and blow air when necessary; arrange the position of the flower plate correctly, print the fine stems first and then print the block surface; try to avoid excessive squeezing of the plate position when handling the flower pattern. Processing to reduce the contact area of the imprint.
2女分
Fabric edge paste. Because the grey fabric door width is not uniform, it is narrow first and then wide or the patch is not on the same line. The grout at both ends of the flat screen is printed on the guide belt and then glued to the back of the next screen. , and then printed on the next sheet of cloth edge, causing the paste; the edge suction device fails, and the cloth edge is not on the straight line; the width of the flat net sealing net sealing net sealing is large after the width of the dry grey cloth.
Solution: for different door widths The grey cloth must be reorganized, and the width of the machine-printed fabric must be consistent in width. The edges should be sealed at the two ends of the screen from the width of the cloth seal and the printing position, so that there are no unnecessary patterns to print the color paste on the guide belt; the edge suction device is intact and paste When cloth is equidistant from one side of the conduction belt, it does not drift; the scraper scraper width is greater than at least 125px on each side of the cloth seal.
3Set open
The flower shape is blurred, and the color of the pattern penetrates into the fiber direction.
Cause: The conduction belt does not wipe dry after cleaning, and there is a watermark after the grey cloth is pasted on the water-containing conduction belt, causing penetration after the color paste is printed; the color paste viscosity is low, and the dye is dyed Extreme concentration, excessive amount of printing slurry absorbing or large amount of hygroscopic agent, and poor water-bearing properties of the original paste will cause the melting after printing; the printed version will be printed before it is washed, causing the melting of the previous versions, which are all To be aware of.
Solution: Check whether the wiper device of the guide belt water washing box is good; choose paste with good water bearing properties; check the reasonable amount of process prescription (the saturation amount of dye, the auxiliary amount of different grey cloths), and the slurry should not be shelved too long; Wash the plate and blow dry it before use.
4Scrape
The different color paste is scraped in, resulting in an incorrect color, or a dark color mixed with light-colored patterns.
Cause of the occurrence: dark flower blocks are large and there are many slurries; the edges of the flower frame are not good, and the slurry is brought into the flower plate from the guide belt. Add the wrong color when adding slurry.
Solution: block the flower layout according to the fabric door width. Print At the same time, the slurry should be cleaned, and the slurry should be added less, and the slurry should be added frequently. When changing the color, the slag should be cleaned to avoid the residual slurry being brought into the new color matching pattern. The slurry should not be added wrongly. Without affecting the complex color conditions, change the flowers Page location.
5frame print
The flower shape shows abnormal stripes in the shape of the flower frame near the plate.
This is caused by improper network version. The frame is poorly installed, and the height is not high or low 1. The gap between the screen and the conduction band is too small.
Solution: You can slightly raise the mesh frame or flatten the mesh frame, or you can handle the correct opening of the flower shape and keep the appropriate distance from the edge of the mesh frame.
6The color difference in the first version (uneven scraping or a certain interval appears in the horizontal direction of the fabric. Color depth)
Cause: the online version is inherently insufficient, and the photosensitive The thickness of the glue is uneven, and the flower shape is exposed unevenly, which affects the difference in the amount of slurry. Second, the net frame is not on the same plane, or is poorly installed. Third, the scraper is loose, the blade is uneven, or the stroke is jumped when scraping.
Solution: For defects caused by the online version, you need to make a new online version, if It is the film’s photosensitive, and the quality of the film must also be checked. The mesh frame is flat, but when printing, you must observe whether the flower shape is distorted. The two ends of the screen are installed in the same height. The thickness and thickness of the scraper blade are consistent, and the height is consistent, and the installation is in place.
7Continue the version
The printing colors at the ends are imprinted or overlapped or disconnected.
Cause: The printing guide belt runs back position is inaccurate; the left and right pressure of the scraper is not Adjust well; the mesh frame is too high from the conductor belt, and it is found that the screen on the edge is peeling off when scraping the printing; the flower-shaped open circuit size is too large, resulting in a large pressure area of the joint port.
Solution: Set the conduction belt operation return position according to the flower shape return position, or check whether the conduction belt is running normally; scraper pressure adjustment It just so that the slurry is appropriate; adjust the height of the screen; the back of the screen can be partially set off with a large gap and fine screen; modify the unreasonable opening.
8Dinghua version
The color of the flowers is uneven and has chrysanthemum-like hair.
Cause of the occurrence: When the flower plate is lifted, the color paste is pulled up, and the color paste is stained with the back of the flower plate, which affects the scraping of the printing; the color paste is too thick or insufficiently puffed; the amount of a certain dye is used too high. /span>
Solution: Adjust the viscosity of the slurry or adjust the puffing time of the paste: Use the old slurry after filtering or replace it with a new slurry: Adjust the prescription and wash the flower plate in time.
9Flower
The flower location has a grey cloth color or poor permeability, just like the spots in the shape of the skin of the sand fish.
Cause of the occurrence: There is no curing agent after making the flower plate; clean it up, or the flower plate is used for too long, The pulp family makes the mesh smaller, causing the plugging of evil; the scraper is improperly selected or the pressure is too small, and the pulp is not enough; the viscosity of the color paste is too thick, making it difficult to scrape and print; there are oil stains, waxy, etc. on the grey cloth; the flower in front of the flower is not dry, The back side of the back flower version is sucked up.
Solution: Check after the flower version is made Is the plate hole good? The screen should be cleaned after each printing; choose a scraper and use appropriate force; the capillary effect must be tested for the grey cloth prepared for printing, and if necessary, the grey cloth should be retrained; the color paste viscosity should be tested for each printing paste : Select the number of mesh corresponding to the flower pattern.
10thick and thin stem
The thin stems are uneven in thickness.
Cause: The screen version has defects in thickness; the left and right magnetic magnitudes of the magnetic stage are different, resulting in different printing pressures; the screen version is uneven; the left and right pressures of the scraper are inconsistent, the blade edges are not uniform, and the thickness of the scraper is not consistent; The scraping and printing and picking pulp is not clean.
Solution: carefully check whether the fine stems of each return position of the flower version are the same; Check the magnetic force of the magnetic table; lay it flat when printing and installing the screen; choose a scraper and adjust the pressure of the scraper; the blade edges must be consistent when changing the scraper; adjust the height of the mesh according to the thickness of the fabric.
22 Flower shape is skewed
Floral pattern for fabric warp weft yarn The line is inclined or curved.
Cause: printed grey cloth (silk) itself has a slant Or the seam head is bad; the patch is crooked.
Solution: Printed grey cloth (especially printed geometric shapes) needs to be integrated and inspected, and only after passing the qualification can it enter large-scale production; the seam head is sewn in parallel with the weft line; the machine patch remains straight.
12Sandeye
Open on printed fabric Like sand size, dotted sand holes.
Cause: The screen version has a long service life, and local photosensitive adhesive is shedding and permeable; the plate production quality is poor and the adhesive film is not firm, and the film falls off after being scraped by a scraper.
Solution: observe the online version frequently and repair the sand hole immediately after finding it; strictly check the online version before getting on the car.
13Leaking slurry
There is color in non-flower shapes.
Cause: The film removal of the flower plate or the edge of the flower plate is not good.
Solution: on the web version Check in front of the machine, repair it in time when it occurs in the middle.
14Saiwang
The flower shape is incomplete or the color dots in the local ribbon, white dots Some of the flowers are missing or there are few mud spots.
Cause of occurrence: There are impurities in the pulp family, which plug the mesh, especially It is paint printing; the edges of the mesh are slurry after long-term printing; the cloth is invaded by impurities, such as thread heads, etc.; the photosensitive adhesive film is not cleaned when making the mesh: the fabric is covered with fluff or thread heads, etc.
Solution: Observe frequently during printing, and wipe away the garbage immediately when you find the plugged net; if you find a large area plugged net, stop the network immediately to clean the screen, filter the color paste; the small surface is obviously flat If there are impurities outside the network or the back of the screen, scrape them off with a tool.
15Pine printing (turtle pattern)
Ripple appear on the printed patterns.
Cause: The mesh of the screen and the yarn structure of the printed fabric overlap each other and cause interference; the mesh frame is too loose; the number of mesh is not suitable.
Solution: mesh adopts oblique tension, mesh angle Keep the fabric angle 10 to 15 degrees; change the appropriate mesh; the tension in the tension is consistent everywhere in the tension.
16Furrowing
The flower shape is blurred and has a displaced ghosting feeling.
Cause: improper operation when starting the version; the wire mesh is too loose; conduction belt operation and screen operation Out of synchronization; continuous version operation, it is pressed by the border.
Solution: Start the plate slowly or tiltly; stretch the frame according to the standard requirements; check the synchronization problem of the screen version and the conductor belt operation.
17pulp printing
similar to tadpole-shaped seal.
Cause of the occurrence: the color paste is too thin; the slurry is added too much; the slurry is collected too quickly.
Solution: select the right slurry; adjust the required viscosity.
18splash
The color dot or paste caused by splashing of color paste is dragged away.
Cause of occurrence: The operation of the violent plate in the printing was improper; the viscosity of the color paste was not appropriate; too much slurry was added in the slurry tank.
Solution: adjust the viscosity of erotic paste; use appropriate force; add less and more frequently.
19Flying dots, color dots
The color dots of the irregular dye are sprinkled on the cloth, forming small dot-like color stains. Or a certain color containing the color in the same color flower. Color-blocking monochrome color dots.
Cause of the occurrence: the printing color paste is too sticky; the slurry is not clean after printing, the plate is started too fast, and the force is used; it is not dissolved in the color paste The dye may have impurities attached to it, and after being printed on the cloth, it forms spots.
Solution: Place the original paste for enough time to make the paste better; improve the printing operation, single-sided screen versionRaise the slurry, lightly collect the slurry, and adjust the scraping speed; for dyes that cannot be dissolved, you can use high-mesh mesh filter color paste. If there is still, you need to re-tune the color paste and pay attention to the material-making operation.
20Cream printing
There are white wrinkles on the surface of the printed cloth.
Cause of occurrence : The cloth surface is not flat, there is a crepe printing, and the color paste cannot penetrate into the crease during printing; the grey cloth is not firmly attached, and it is carried up when the plate is started. The position of the printing is changed when the latter set of plates is pressed down. ;The white blank edge is wide and fast, and the creases are generated when applying the cloth; the seam head is uneven and wrinkles or the tension of the silk is uneven; the conductive tape resin is not flat, which makes the scratch printing uneven.
Solution: the cloth should be flat and adjust the cloth should be Tension; check the viscosity of the resin on the surface of the conduction belt or the viscosity of the patch slurry, check the temperature of the hot roller or the pressure of the patch slurry, and apply the patch slurry or re-adhesive resin; the seam head should be flat to avoid affecting Apply effect.
21Leaking white
Part of warp or weft yarn flips or moves to the front and back sides of the fabric.
Cause: color paste has poor permeability and dye cannot penetrate into the fiberDimensional interior; the scraping force is too small and the slurry is not enough, resulting in insufficient color dye; the grey cloth resists water and does not absorb color paste; after printing, the silk is covered when washing after washing after treatment, the fabric structure is relatively loose, and a small amount of fiber is turned over, Exposed white at the bottom.
Solution: ensure the swelling time of the slurry and adjust the color Stir the slurry evenly, so that the color paste penetrates into the three parts of the thickness of the cloth when printing.
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