Method for processing tension stretching roller capable of reducing air negative pressure intensity between film surface and roller surface

Abstract

The invention relates to a method for processing a tension stretching roller for reducing air negative pressure intensity between a film surface and a roller surface, which comprises a stretching roller body structure, a driving roller corresponding to the stretching roller body structure and a stretching film body, the ceramic surface layer of the stretching roller body structure is subjected to laser engraving treatment, and the surface of the ceramic anilox roller is subjected to polishing and post-treatment: the ceramic surface layer is subjected to laser engraving treatment, a ceramic anilox roller primary product of which the surface is sprayed with the ceramic surface layer is taken, and patterns are engraved on the ceramic surface layer by adopting a laser engraving method; the tension stretching roller has the beneficial effects that the tension stretching roller for reducing the air negative pressure intensity between the film surface and the roller surface achieves stable and uniform tension stretching of a thin and large-width film in the stretching process, does not have bad defects, is more excellent in appearance, and is further suitable for the requirement of large-area stretching.

Description

Technical Field

[0001] The invention relates to a stretching roller structure, in particular to a method for processing a stretching roller with reduced air negative pressure tension between a film surface and a roller surface. Background Art

[0002] The traditional cold press tension system has only one tension stretching device. When the cold press rolls and splices the tape, before the joint reaches the roller, the roller needs to be opened to avoid loss of the roller at the joint and breaking of the tape due to the film roll. There is no tension barrier of the roller. To ensure consistency with the unwinding tension, the system automatically reduces the tension of the tension stretching device to the unwinding tension. After the joint passes the roller, there is a blank area of ​​the film that is equal to the distance from the transfer belt and is not extended. The cathode is prone to tape breakage, and the anode is prone to inward shrinkage and overlap of the blank area when passing the roller. During pre-slitting, the correction device fails and swings, resulting in abnormal conditions such as film wrinkling, pre-slitting width deviation, and tape breakage.

[0003] The anilox roller is a core component of flexographic printing machines, packaging printing machines, coating machines, glazing machines, etc. It is responsible for evenly transferring a certain amount of ink to the printing plate, which is crucial to the printing effect. There are two main types of anilox rollers: metal anilox rollers and ceramic anilox rollers. However, metal anilox rollers have poor wear resistance and short service life, and it is difficult to engrave them into high-line anilox rollers. With the development of technology, laser engraved ceramic anilox rollers are increasingly replacing chrome-plated anilox rollers and are more widely used.

[0004] like Figure 1 As shown in the figure, the negative air pressure between the film surface and the roller surface increases, causing the film width to increase and the thickness to become thinner. Many problems will arise in the winding process: on the one hand, it is difficult to ensure absolute uniformity of film thickness during the coating process (currently, most product thickness differences are controlled within ±1μm), especially the transverse thickness of the film. During the stretching process, the difference in the transverse thickness of the film will increase with the increase in the number of film coating layers, resulting in the accumulation of thickness differences. The gradually enlarged thickness difference will easily lead to defects such as stripes, strands, and wrinkles when the film is stretched. Summary of the invention

[0005] The purpose of the invention is to provide a method for processing a tension stretching roller to reduce the negative air pressure between the film surface and the roller surface, so as to solve the problem that the negative air pressure between the film surface and the roller surface increases, causing defects such as stripes, streaks, and wrinkles in the film when stretched.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a method for processing a stretching roller to reduce the negative pressure tension of air between the film surface and the roller surface, comprising a stretching roller structure, a corresponding transmission roller of the stretching roller structure and a stretching film body, wherein the ceramic surface layer of the stretching roller structure is processed by laser engraving and the surface of the ceramic anilox roller is polished and post-processed: the ceramic surface layer is processed by laser engraving, a ceramic anilox roller primary product with a ceramic surface layer sprayed on the surface is taken, and a pattern is engraved on the ceramic surface layer by a laser engraving method; wherein the laser engraving step comprises: A1. The ceramic anilox roller with ceramic surface sprayed on the surface is calibrated on the machine to adjust the straightness and runout; A2. Adjust the laser light source’s focus parameters and move the Y-axis. After confirming the image, try engraving. Then adjust and set the laser engraving power, pulse and frequency parameters to change the shape, depth and thickness of the mesh. Optimize the engraving program, set the pulse length, the number of multi-beam beams, the number of multi-beam pitches, the number of overlaps, and adjust the laser refraction angle of the laser engraving equipment to change the mesh shape. A3. Through the axial adjustment of multiple light beams and the circumferential adjustment of multiple light beams, the laser beam is controlled to carve on the ceramic anilox roller primary product, and a circular inner flow airway mesh with a cross-sectional shape of auspicious clouds is engraved.

[0007] The surface of the laser engraved ceramic anilox roller is polished and post-processed to obtain a processed ceramic anilox roller; The method for preparing the primary ceramic anilox roller in step (A1) comprises the following steps: B1. Use supersonic flame spraying to spray the metal base layer on the surface of the metal roller; B2. Spray ceramic powder on the metal substrate by supersonic flame spraying, wherein the powder carrier gas for spraying is argon; control the flow rate of flame spraying oxygen, aviation kerosene and argon and the powder delivery amount, as well as the distance between the nozzle of the spray gun and the surface to be sprayed, to form a ceramic surface layer; the flow rate of oxygen is in the range of 0 to 2000 LPM, the flow rate of the aviation kerosene is controlled in the range of 0 to 1000 LPM, the flow rate of the argon is controlled in the range of 0 to 20 LPM, the powder delivery amount is 12 to 20 g / min, and the distance between the nozzle of the spray gun and the surface to be sprayed is 15 to 18 cm; B3. Fine grinding and polishing of the ceramic surface layer; Wherein, in the step (A2), the post-processing method of the ceramic anilox roller is: performing laser remelting treatment on the surface of the ceramic anilox roller to form a remelted layer.

[0008] The beneficial effects of the present invention are as follows: the processing reduces the negative pressure of air between the film surface and the roller surface. The tension stretching roller is used for thin and wide films during the stretching process, so as to achieve stable and uniform tension stretching without any defects and with better appearance, thus being suitable for large-area stretching needs.

[0009] The present invention will be described in more detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 Schematic diagram of the current air pressure between the membrane surface and the roller surface.

[0011] Figure 2 It is a schematic diagram of the air pressure between the membrane surface and the roller surface of the present invention. DETAILED DESCRIPTION

[0012] The directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like in the application text are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0013] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0014] Embodiment 1, as Figure 2 As shown, a method for processing a stretching roller to reduce the negative pressure tension of air between a film surface and a roller surface comprises a stretching roller body structure 1, a drive roller 2 of the corresponding stretching roller body structure, and a stretching film body 3, comprising laser engraving treatment on a ceramic surface layer and polishing and post-processing the surface of a ceramic anilox roller: the ceramic surface layer is laser engraved, a ceramic anilox roller primary product with a ceramic surface layer sprayed on the surface is taken, and a pattern is engraved on the ceramic surface layer by a laser engraving method; wherein the laser engraving step comprises: A1. Calibrate the ceramic anilox roller with ceramic surface sprayed on the machine to adjust the straightness and runout A2. Adjust the laser light source’s focus parameters and move the Y-axis. After confirming the image, try engraving. Then adjust and set the laser engraving power, pulse and frequency parameters to change the shape, depth and thickness of the mesh. Optimize the engraving program, set the pulse length, the number of multi-beam beams, the number of multi-beam pitches, the number of overlaps, and adjust the laser refraction angle of the laser engraving equipment to change the mesh shape. A3. Through the axial adjustment and circumferential adjustment of multiple light beams, the laser beam is controlled to carve the ceramic anilox roller primary product, and a circular inner flow channel mesh with a cross-sectional shape of auspicious clouds is engraved; The surface of the laser engraved ceramic anilox roller is polished and post-processed to obtain an improved ceramic anilox roller; The method for preparing the primary ceramic anilox roller in step (A1) comprises the following steps: B1. Use supersonic flame spraying to spray the metal base layer on the surface of the metal roller; B2. Spray ceramic powder on the metal substrate by supersonic flame spraying, wherein the powder carrier gas for spraying is argon; control the flow rate of flame spraying oxygen, aviation kerosene and argon and the powder delivery amount, as well as the distance between the nozzle of the spray gun and the surface to be sprayed, to form a ceramic surface layer; the flow rate of oxygen is in the range of 0 to 2000 LPM, the flow rate of the aviation kerosene is controlled in the range of 0 to 1000 LPM, the flow rate of the argon is controlled in the range of 0 to 20 LPM, the powder delivery amount is 12 to 20 g / min, and the distance between the nozzle of the spray gun and the surface to be sprayed is 15 to 18 cm; B3. Fine grinding and polishing of the ceramic surface layer; Wherein, in the step (B2), the post-processing method of the ceramic anilox roller is: performing laser remelting treatment on the surface of the ceramic anilox roller to form a remelting layer.

[0015] The beneficial effects of the present invention are as follows: the processing reduces the negative pressure of air between the film surface and the roller surface. The tension stretching roller is used for thin and wide films during the stretching process, so as to achieve stable and uniform tension stretching without any defects and with better appearance, thus being suitable for large-area stretching needs.

[0016] The above embodiments are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering and technical personnel in the field shall fall within the protection scope determined by the claims of the present invention.

[0017] The parts not involved in the present invention are the same as the prior art or can be implemented by using the prior art.

Claims

1. A method for processing a stretching roller to reduce the negative pressure tension of air between a film surface and a roller surface, comprising a stretching roller structure, a drive roller corresponding to the stretching roller structure, and a stretching film body, wherein the ceramic surface layer of the stretching roller structure is laser engraved and the surface of the ceramic anilox roller is polished and post-processed: the method is characterized in that: The ceramic surface layer is processed by laser engraving, and a ceramic anilox roller with a ceramic surface layer sprayed on the surface is taken, and a pattern is engraved on the ceramic surface layer by laser engraving; wherein the laser engraving step includes: A1. The ceramic anilox roller with ceramic surface sprayed on the surface is calibrated on the machine to adjust the straightness and runout; A2. Adjust the laser light source’s focus parameters and move the Y-axis. After confirming the image, try engraving. Then adjust and set the laser engraving power, pulse and frequency parameters to change the shape, depth and thickness of the mesh. Optimize the engraving program, set the pulse length, the number of multi-beam beams, the number of multi-beam pitches, the number of overlaps, and adjust the laser refraction angle of the laser engraving equipment to change the mesh shape. A3. Through the axial adjustment of multiple light beams and the circumferential adjustment of multiple light beams, the laser beam is controlled to carve on the ceramic anilox roller primary product, and a circular inner flow airway mesh with a cross-sectional shape of auspicious clouds is engraved.

2. The method for processing a stretching roller to reduce the negative pressure tension between the film surface and the roller surface according to claim 1, characterized in that: The surface of the laser engraved ceramic anilox roller is polished and post-processed to obtain a processed ceramic anilox roller; The method for preparing the primary ceramic anilox roller in step (A1) comprises the following steps: B1. Use supersonic flame spraying to spray the metal base layer on the surface of the metal roller; B2. Spray ceramic powder on the metal substrate by supersonic flame spraying, wherein the powder carrier gas for spraying is argon; control the flow rate of flame spraying oxygen, aviation kerosene and argon and the powder delivery amount, as well as the distance between the nozzle of the spray gun and the surface to be sprayed, to form a ceramic surface layer; the flow rate of oxygen is in the range of 0 to 2000 LPM, the flow rate of the aviation kerosene is controlled in the range of 0 to 1000 LPM, the flow rate of the argon is controlled in the range of 0 to 20 LPM, the powder delivery amount is 12 to 20 g / min, and the distance between the nozzle of the spray gun and the surface to be sprayed is 15 to 18 cm; B3. Fine grinding and polishing of the ceramic surface layer; Wherein, in the step (A2), the post-processing method of the ceramic anilox roller is: performing laser remelting treatment on the surface of the ceramic anilox roller to form a remelted layer.

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