Successful thin printing on corrugated board substrates requires knowledge of the mechanical properties of the corrugated substrate, including thickness deviation, crush strength, and plasticity. After careful observation of the corrugated substrate, you will find that the thickness is not uniform. This change in size is called the thickness deviation. The thickness of the corrugated board is mainly determined by the height of the corrugation. Because the printing nip is closed. Therefore, the plate contacts the top of the corrugation before it can contact the entire surface to be printed.
For direct flexo printing on corrugated substrates, a printing impression of greater than 0.005 inches is usually required to compensate for this deviation. At the same time, corrugated substrates require lower printing pressures, especially for fine line and gradation printing. This limits the amount of press pressure that corrugating allows.
The following table summarizes some common corrugated substrate measurements. An in-depth analysis of the properties of the corrugated substrates can reveal their impact on the corrugated flexo printing. (A total of eight substrates were selected and their thickness varied from 0.068 to 0.261 inches)
Cardboard breakage strength If the amount of compression is kept below the breakage level of the paperboard, the substrate will spring back to its original shape when it leaves the print nip; if its undulated wall is pressed and bent, it will exceed the cardboard level limit compression. At that time, the cardboard will not return to its original thickness or even be damaged.
Compression Absorption Thin hard corrugated substrates are less malleable than thicker plates, but most corrugated substrates are more malleable than many plates. For a typical example, the paper and substrate have a plasticity of 0.001 and 0.002 inch/PSI, respectively, and when the stamping amount is 0.01 inch, the printing plate and the cardboard are compressed to 0.0033 and 0.0067 inch respectively. . For thicker printing, this impression may be transitional, but using an air-cushioned lining plate with a plasticity of 0.007 inch/PSI, at the same 0.001 and 0.002 inch, the compression of the reticle is zero. 007 inches. It can be seen that using the air-cushion lining plate technology, the amount of compression of the printing plate and the substrate will be reduced, so that the reticular plate will absorb a greater amount of compression.
In thin-stencil printing, since the backing plate absorbs the deformation caused when the compression amount is printed, a compression amount greater than 0.010 inches can be used in thin-plate printing without damaging the substrate. For old presses where roller eccentricity and bearing wear exceeds 0.002 inches (0.05 mm), the use of a reticle can make up for the deficiencies.
How to choose the air-cushion lining version of the majority of corrugated printing press between the plate roller and the embossing roller gap between 5 ~ 7mm, such as the plate roller and the embossing roller gap is 7mm, can use 3.94mm printing plate and 3.05mm lining plate combination. If the gap between the plate roller and the embossing roller is 5mm, it is recommended to use 2.84mm printing plate, 2.03mm gasket. If the 3.94mm printing plate has been used, and these printing plates can still be used, the 1.02mm lining plate can be used. .
Air-cushion linings have a variety of elastic and multiple thickness specifications. It can be combined with standard thin printing plate, suitable for any gap machine to meet different printing requirements.
Identification of the lining plate The quality of the lining plate directly affects the printing quality. The quality of the lining plate should be noted as follows:
1. Resilience 2. Leveling accuracy 3. Service life Resilience The identification method is very simple, as long as the use of ball point pen or fingernail pressed hard on the lining for a while, if found on the material indentation, the material rebound is poor, not as a printing pad.
Leveling accuracy The thickness can be measured with a thickness gauge or a micrometer to see if it is even.
The service life is determined by whether the lining plate has a PE film and resilience. The lining plate with PE film can protect the lining plate from being damaged, not easily damaged, easy to install, and has good elasticity and durability. It does not deform for many years.
Liner features and functions 1, to reduce the pressure point of the printing point, effectively control the expansion of outlets.
2, to avoid cardboard deformation, extend the life of the printing plate.
3, allows higher printing speeds.
4. It has a unique compensation effect for the oversized plate roller.
5, for low-quality corrugated board has good printability, and can avoid damage to corrugated board.
6, improve the printing quality of old or old equipment. (Shanghai Aookeli Printing Machinery Co., Ltd.)
For direct flexo printing on corrugated substrates, a printing impression of greater than 0.005 inches is usually required to compensate for this deviation. At the same time, corrugated substrates require lower printing pressures, especially for fine line and gradation printing. This limits the amount of press pressure that corrugating allows.
The following table summarizes some common corrugated substrate measurements. An in-depth analysis of the properties of the corrugated substrates can reveal their impact on the corrugated flexo printing. (A total of eight substrates were selected and their thickness varied from 0.068 to 0.261 inches)
Thickness (inches) Tensile Strength (lbs.) Tile Clamshell Metering Paper Gauge Deviation (inches) Moldability (inches/PSI) Breaking Strength (PSI) Compression (inches) 0.068200E Bleached Paper 0.00190.000046940.00550. 070200E Kraft paper 0.00250.000058790.00600.114200B white spot paper 0.00200.000168270.00600.119200B bleached paper 0.00230.000119330.00650.155200C white spot paper 0.00470.000303180.00750.169200C Kraft paper 0.00430.000236180 .00800.180275C Kraft paper 0.00500.000375160.00950.261275B Double Kraft paper 0.00510.00093580.0100
Dot enlargement If the print pressure is less than the thickness deviation of the substrate, a common pattern of lines or washboard will appear. If the amount of imprinting is too large, it will cause the dots to increase to control the appropriate printing pressure in order to ensure the fine lines and the level of color brush effect. Cardboard breakage strength If the amount of compression is kept below the breakage level of the paperboard, the substrate will spring back to its original shape when it leaves the print nip; if its undulated wall is pressed and bent, it will exceed the cardboard level limit compression. At that time, the cardboard will not return to its original thickness or even be damaged.
Compression Absorption Thin hard corrugated substrates are less malleable than thicker plates, but most corrugated substrates are more malleable than many plates. For a typical example, the paper and substrate have a plasticity of 0.001 and 0.002 inch/PSI, respectively, and when the stamping amount is 0.01 inch, the printing plate and the cardboard are compressed to 0.0033 and 0.0067 inch respectively. . For thicker printing, this impression may be transitional, but using an air-cushioned lining plate with a plasticity of 0.007 inch/PSI, at the same 0.001 and 0.002 inch, the compression of the reticle is zero. 007 inches. It can be seen that using the air-cushion lining plate technology, the amount of compression of the printing plate and the substrate will be reduced, so that the reticular plate will absorb a greater amount of compression.
In thin-stencil printing, since the backing plate absorbs the deformation caused when the compression amount is printed, a compression amount greater than 0.010 inches can be used in thin-plate printing without damaging the substrate. For old presses where roller eccentricity and bearing wear exceeds 0.002 inches (0.05 mm), the use of a reticle can make up for the deficiencies.
How to choose the air-cushion lining version of the majority of corrugated printing press between the plate roller and the embossing roller gap between 5 ~ 7mm, such as the plate roller and the embossing roller gap is 7mm, can use 3.94mm printing plate and 3.05mm lining plate combination. If the gap between the plate roller and the embossing roller is 5mm, it is recommended to use 2.84mm printing plate, 2.03mm gasket. If the 3.94mm printing plate has been used, and these printing plates can still be used, the 1.02mm lining plate can be used. .
Air-cushion linings have a variety of elastic and multiple thickness specifications. It can be combined with standard thin printing plate, suitable for any gap machine to meet different printing requirements.
Identification of the lining plate The quality of the lining plate directly affects the printing quality. The quality of the lining plate should be noted as follows:
1. Resilience 2. Leveling accuracy 3. Service life Resilience The identification method is very simple, as long as the use of ball point pen or fingernail pressed hard on the lining for a while, if found on the material indentation, the material rebound is poor, not as a printing pad.
Leveling accuracy The thickness can be measured with a thickness gauge or a micrometer to see if it is even.
The service life is determined by whether the lining plate has a PE film and resilience. The lining plate with PE film can protect the lining plate from being damaged, not easily damaged, easy to install, and has good elasticity and durability. It does not deform for many years.
Liner features and functions 1, to reduce the pressure point of the printing point, effectively control the expansion of outlets.
2, to avoid cardboard deformation, extend the life of the printing plate.
3, allows higher printing speeds.
4. It has a unique compensation effect for the oversized plate roller.
5, for low-quality corrugated board has good printability, and can avoid damage to corrugated board.
6, improve the printing quality of old or old equipment. (Shanghai Aookeli Printing Machinery Co., Ltd.)
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