Sheet-fed offset printing ink drying system and method

Abstract

The invention relates to a sheet-fed offset printing ink drying system and method, which comprises a sealed housing; a housing inner cavity is provided in the sealed housing; an air inlet pipe is provided on the sealed housing, and an air outlet is provided below the sealed housing to blow toward the upper surface of the printed matter. The invention has reasonable design, compact structure and convenient use.

Description

Technical Field

[0001] The invention relates to a sheet-fed offset printing ink drying system and method. Background Art

[0002] During the printing process of ordinary offset printing machines, the ink does not dry quickly, which can easily cause the ink on the front and back sheets to smudge and stick together. In order to avoid these problems and meet the needs of high-speed printing, the current existing technologies are: some use quartz tube heating and exhaust gas suction methods, which have the disadvantages of high ink viscosity at high temperatures and are difficult to meet the needs of high-speed printing, and are easy to cause deformation of the substrate, and consume a lot of energy; the air suction wind has poor fluidity, and its basic ideas are all continued from gravure or flexographic printing, and the characteristics of offset printing itself are not seen; the current general method of sheet-fed offset printing is to spray powder with a diameter greater than the thickness of the ink layer, the thickness of the printing ink layer is about 1 micron, and the powder particles are about 3-4 microns. Physical isolation is achieved through powder without adhesion, but this method has defects, 1. During the glazing process, due to the influence of powder, if the powder is not removed, the printed product will be sandy and ugly after glazing, and the varnish will be thicker, which will cause waste. Dust needs to be removed before glazing, which is time-consuming and labor-intensive, and the laminating glue is thick; 2. During the laminating process, in order to protect the ink layer, some printed products are coated on the surface, and the glue layer thickness is less than the powder diameter, which will also cause the laminating surface to be rough and uneven. 3. After powder spraying, the powder is scattered in the air. Although a dust collection device can be installed, some of the powder is still scattered in the air. The operator can wear a mask to prevent dust, but some of the powder will be inhaled into the lungs. Long-term accumulation is prone to silicosis, which is an occupational disease in printing. Summary of the invention

[0003] The technical problem to be solved by the present invention is generally to provide a sheet-fed offset printing drying system and method. In order to solve the problem of dust isolation and solidification, the present invention finds that strong blowing can be used to solve the problem of complete drying of ink based on the high viscosity of offset printing. High-speed airflow is added to the surface of the printing ink, and the airflow is heated to 60-100 degrees to form a high-temperature airflow that acts on the surface of the ink, which can promote the instant drying of the ink and achieve the requirement that the ink does not stick to the paper when in contact.

[0004] The present invention uses a semiconductor heating device for airflow heating, which is characterized by a controllable maximum temperature of 250 degrees, which is far lower than the ignition point of flammable materials and is relatively safe; the size is small, and the width and height of the semiconductor are less than 30mm, which is convenient for embedding in the lamp body of the curing system; the semiconductor heating body has a long service life of nearly 100,000 hours and good stability. Therefore, the curing effect of ordinary offset printing machines can be further improved by using semiconductor heating to assist the curing of airflow.

[0005] To solve the above problems, the technical solution adopted by the present invention is:

[0006] A sheet-fed offset printing ink drying system comprises a sealed shell having a shell inner cavity; an air inlet pipe is arranged on the sealed shell, and an air outlet is arranged below the sealed shell to blow air toward the upper surface of the printed matter in a certain direction.

[0007] As a further improvement of the above technical solution:

[0008] A heater and / or a temperature control component is arranged in the sealed housing to heat the circulating airflow.

[0009] The sealed housing comprises a housing body and a housing cover plate arranged on the housing body;

[0010] An air guide baffle is laterally arranged in the shell inner cavity of the shell body to divide the shell inner cavity into an air outlet cavity connected to the air outlet and an air inlet cavity connected to the air inlet pipe. An intermediate air duct is arranged in the air guide baffle between the inner sides corresponding to the air guide baffle and the sealed shell. The farther the distance of the intermediate air duct opening relative to the air inlet pipe, the larger the opening.

[0011] The sealed housing comprises a housing body and a housing cover plate arranged on the housing body;

[0012] At the air outlet of the shell cover, a lower air outlet channel is arranged between the shell cover and the side surface of the lower shell.

[0013] The system also includes at least one of the following solutions;

[0014] Solution a, a lower guide groove is provided on the inner side wall of the shell cover or the end face of the lower shell side;

[0015] Solution b: The housing cover is provided with a cover extension portion or a cover folding plate exposed at the lower air outlet channel;

[0016] Solution c, the shell cover is provided with a cover extension portion exposed at the lower air outlet channel, and a cover folding plate is provided at the lower end of the cover extension portion;

[0017] Solution d: A secondary air distribution channel is arranged on the side of the lower shell body and is located on the longitudinal side of the lower air outlet channel and is arranged transversely; an intermediate swirl portion is arranged below the side of the lower shell body between the lower air outlet channel and the secondary air distribution channel.

[0018] A shell air guide cover is arranged on the side of the sealing shell;

[0019] The shell air deflector back plate is a parabolic back plate;

[0020] An air distribution box is arranged in the middle of the air guide cover of the shell to communicate with the outlet of the air inlet pipe, and the air outlet is below the air guide cover of the shell;

[0021] An air regulating rotating main shaft is axially arranged on the shell air guide cover, and an air regulating plate is arranged on the air regulating rotating main shaft;

[0022] The air regulating plate includes a front air regulating regulating plate and a rear air regulating regulating baffle plate symmetrically disposed on the air regulating rotating main shaft;

[0023] A wind-adjusting rear wind-shielding rubber is provided at the edge of the wind-adjusting rear adjusting baffle plate to be in sealing contact with the parabola back panel;

[0024] Air-adjusting elastic steel balls are distributed circumferentially on the air-adjusting rotating main shaft; and air-adjusting positioning holes are correspondingly arranged on the sealing shell to correspond to the air-adjusting elastic steel balls.

[0025] A shell rear plate is installed at the lower end of the sealed shell; the air outlets are located on one side of the shell rear plate and are distributed laterally.

[0026] A cold air knife is arranged on the output side of the sealed housing.

[0027] A sheet-fed offset printing ink drying method, using a sheet-fed offset printing ink drying system, the method is as follows:

[0028] S1, the offset printed product to be cured reaches the air outlet;

[0029] S2, first, the air inlet pipe ventilates into the air inlet cavity; then, through the opening of the middle air duct, the airflow is homogenized and enters the air outlet cavity and reaches the air outlet. At the same time, the heater heats the airflow;

[0030] S3, the hot air flow is output through the lower air outlet channel and is rectified by the lower guide groove for a second time;

[0031] S4, the hot air flow rotates in the middle cyclone part to form a cyclone while solidifying the ink, prolonging the heating time of the air flow on the ink, and discharges in a certain direction;

[0032] S5, the cold air knife cools the cured printed product.

[0033] The invention has reasonable design, low cost, durability, safety and reliability, simple operation, time and labor saving, money saving, compact structure and convenient use. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the basic and improved usage structures of Example 1 of the present invention.

[0035] Figure 2 It is a schematic diagram of the structure used in Example 2 of the present invention.

[0036] Figure 3 It is a schematic diagram of the principle of the present invention.

[0037] Wherein: 1. sealed housing; 2. housing inner cavity; 100. housing body; 101. housing cover;

[0038] 102. Temperature control component; 103. Air outlet cavity; 104. Air guide baffle; 105. Air inlet cavity; 106. Lower air outlet channel;

[0039] 107, lower guide groove; 108, lower shell side; 109, cover plate extension; 110, cover plate folding plate;

[0040] 111. Secondary air distribution channel; 112. Intermediate swirl section.

[0041] 3. Shell air deflector; 4. Parabola back panel; 5. Shell back panel; 6. Air regulating plate; 7. Air inlet pipe;

[0042] 8. Air distribution box; 9. Air outlet; 10. Heater; 11. Air adjustment rotating spindle; 12. Air adjustment front adjustment plate;

[0043] 13. Adjustment baffle after air adjustment; 14. Wind shield rubber after air adjustment; 15. Elastic steel ball for air adjustment; 16. Positioning hole for air adjustment. DETAILED DESCRIPTION

[0044] like Figure 1-3 As shown, the sheet-fed offset printing ink drying system of this embodiment includes a sealed housing 1; a housing inner cavity 2 is provided in the sealed housing 1; an air inlet pipe 7 is provided on the sealed housing 1, and an air outlet 9 is provided below the sealed housing 1 to blow toward the upper surface of the printed matter in a certain direction.

[0045] A heater 10 and / or a temperature control component 102 are arranged in the sealed housing 1 to heat the circulating airflow. The heater and the temperature control component, i.e., the temperature controller, are combined to achieve fixed temperature control to avoid overheating.

[0046] The sealed housing 1 includes a housing body 100 and a housing cover 101 disposed on the housing body 100, which is disassembled for the convenience of description;

[0047] For the improvement of the shell inner cavity, an air guide baffle 104 is horizontally arranged in the shell inner cavity 2 of the shell main body 100 to divide the shell inner cavity 2 into an air outlet cavity 103 connected to the air outlet 9 and an air inlet cavity 105 connected to the air inlet pipe 7. An intermediate air duct is arranged in the air guide baffle 104 and between the inner sides corresponding to the air guide baffle 104 and the sealed shell 1. The farther the distance of the intermediate air duct opening relative to the air inlet pipe 7, the larger the opening is, so that the wind force has output. The heater is preferably in the air outlet cavity or the air outlet to reduce heat loss.

[0048] As for the improvement of the air outlet, at the air outlet 9 of the shell cover 101, a lower air outlet channel 106 is provided between the shell cover 101 and the lower shell side surface 108, so as to dry the ink of the printed matter.

[0049] As a protection extension,

[0050] Solution a, a lower guide groove 107 is provided on the inner wall of the shell cover 101 or the end face of the lower shell side 108; this is the ingenuity of the present invention, at the location of fast wind speed, the airflow loss in the groove is also large, the groove will lead the lost airflow as a tributary to the location of relatively low wind force, thereby achieving secondary uniformity of wind force.

[0051] Solution b, a cover extension portion 109 or a cover folding plate 110 exposed at the lower air outlet channel 106 is provided on the shell cover 101; when this position is not changed, due to the wind pressure difference, the airflow will diffuse in all directions to form a conical high-pressure area above the printed matter, like a cover, which weakens the curing effect of the printed matter. By lengthening the guide, the airflow becomes directional, so that the solvent evaporates quickly. At the same time, the existence of the extended portion causes the airflow to generate a vortex when it flows, so that the airflow heating lasts for a long time, forms a high-temperature area, and reduces heat loss.

[0052] Solution c: The housing cover 101 is provided with a cover extension portion 109 exposed at the lower air outlet channel 106 and a cover folding plate 110 is provided at the lower end of the cover extension portion 109;

[0053] Solution d: A secondary air distribution channel 111 is disposed on the side 108 of the lower shell body and is located on one side of the lower air outlet channel 106 in the longitudinal direction and is disposed in the transverse direction; an intermediate swirl portion 112 is disposed between the lower air outlet channel 106 and the secondary air distribution channel 111 and is located below the side 108 of the lower shell body. The residence time of the airflow in the intermediate swirl portion is prolonged by the secondary air distribution and the primary air distribution.

[0054] The invention can generate wind knives with uniform wind force distribution, realizes the dual functions of hot air drying and volatilization, and avoids dust flying.

[0055] A cold air knife is provided on the output side of the sealed housing 1 to achieve instant cooling of the solidified printed matter.

[0056] like Figure 1 As shown, the sheet-fed offset printing ink drying method of this embodiment, with the aid of a sheet-fed offset printing ink drying system, is as follows:

[0057] S1, the offset printed product to be cured reaches the air outlet 9;

[0058] S2, first, the air inlet pipe 7 is ventilated into the air inlet cavity 105; then, the airflow is homogenized through the opening of the middle air duct and enters the air outlet cavity 103 and reaches the air outlet 9, and at the same time, the heater 10 heats the airflow;

[0059] S3, the hot air flow is output through the lower air outlet channel 106, and at the same time, it is secondary rectified by the lower guide groove 107;

[0060] S4, the hot air flow rotates in the middle cyclone portion 112 to form a cyclone while solidifying the ink, prolonging the heating time of the air flow on the ink, and is discharged in a certain direction;

[0061] S5, the cold air knife cools the cured printed product.

[0062] The present invention is fully described for a clearer disclosure, and the prior art is not listed one by one.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some of the technical features therein with equivalents; it is obvious for those skilled in the art to combine multiple technical solutions of the present invention. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sheet-fed offset printing ink drying method, characterized in that: With the help of sheet-fed offset printing ink drying system, The drying system comprises a sealed shell (1); the sealed shell (1) has a shell inner cavity (2); an air inlet pipe (7) is arranged on the sealed shell (1), and an air outlet (9) is arranged below the sealed shell (1) to blow air towards the upper surface of the printed matter in a certain direction; A heater (10) and / or a temperature control component (102) are arranged in the sealed housing (1) to heat the circulating airflow; The sealed housing (1) comprises a housing body (100) and a housing cover plate (101) arranged on the housing body (100); An air guide baffle (104) is transversely arranged in the shell inner cavity (2) of the shell body (100) to divide the shell inner cavity (2) into an air outlet cavity (103) connected to the air outlet (9) and an air inlet cavity (105) connected to the air inlet pipe (7); an intermediate air duct is arranged between the air guide baffle (104) and the corresponding inner side of the sealed shell (1); the farther the distance of the intermediate air duct opening from the air inlet pipe (7) is, the larger the opening is; At the air outlet (9) of the shell cover (101), a lower air outlet channel (106) is provided between the shell cover (101) and the side surface (108) of the lower shell; A lower guide groove (107) is provided on the inner side wall of the housing cover plate (101) or the end surface of the lower housing side surface (108); A cover plate extension portion (109) located in the lower air outlet channel (106) is provided on the housing cover plate (101), and a cover plate folding plate (110) is provided at the lower end of the cover plate extension portion (109); A secondary air distribution channel (111) is provided on the side surface (108) of the lower shell body and is located on one side of the lower air outlet channel (106) in the longitudinal direction and is arranged in the transverse direction; an intermediate swirl portion (112) is provided between the lower air outlet channel (106) and the secondary air distribution channel (111) and is located below the side surface (108) of the lower shell body; A casing air guide cover (3) is arranged on the side of the sealing casing (1); The back plate of the shell air guide cover (3) is a parabolic back plate (4); An air distribution box (8) is provided in the middle of the shell air guide cover (3) to communicate with the outlet of the air inlet pipe (7), and the air outlet (9) is below the shell air guide cover (3); An air regulating rotating main shaft (11) is axially arranged on the shell air guide cover (3), and an air regulating plate (6) is arranged on the air regulating rotating main shaft (11); The air regulating plate (6) comprises a front air regulating regulating plate (12) and a rear air regulating regulating baffle (13) symmetrically arranged on the air regulating rotating main shaft (11); A rear air-adjusting windshield rubber (14) is provided at the edge of the rear air-adjusting baffle (13) to be in sealing contact with the parabola back panel (4); Air-adjusting elastic steel balls (15) are circumferentially distributed on the air-adjusting rotating main shaft (11); and air-adjusting positioning holes (16) are correspondingly arranged on the sealing housing (1) to correspond to the air-adjusting elastic steel balls (15); A housing rear plate (5) is installed at the lower end of the sealed housing (1); the air outlets (9) are located on one side of the housing rear plate (5) and are distributed laterally; A cold air knife is provided on the output side of the sealed housing (1); Here’s how: S1, the offset printed product to be cured reaches the air outlet (9); S2, first, the air inlet pipe (7) is ventilated into the air inlet cavity (105); then, the airflow is homogenized through the opening of the middle air duct and enters the air outlet cavity (103) and then reaches the air outlet (9), and at the same time, the heater (10) heats the airflow; S3, the hot air flow is output through the lower air outlet channel (106), and at the same time, is secondary rectified by the lower guide groove (107); S4, the hot air flow rotates in the middle cyclone portion (112) to form a cyclone while solidifying the ink, thereby prolonging the heating time of the air flow on the ink and discharging the ink in a certain direction; S5, the cold air knife cools the solidified printed product.

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