Crawler belt for printing plate of flexo printing machine, material and preparation method

Abstract

The invention discloses a crawler belt for a printing plate of a flexo printing machine, which comprises a crawler belt body, a row of tooth holes are formed in the positions, close to the edges, of the two sides of the crawler belt body, the tooth holes correspond to gears in position, the hole widths of the two rows of tooth holes are different, the arrangement of the tooth holes is improved, and the problem that the service life of the crawler belt is short is solved. The invention further discloses the crawler belt material for the printing plate of the printing machine, the crawler belt body comprises the glue layer and the cloth layer which are arranged up and down, and the fatigue damage resistance of an existing crawler belt is improved. The invention further discloses a preparation method of the crawler belt for the printing plate of the flexo printing machine, the sprocket holes are sequentially formed, the crawler belt body is cut according to the required size and shape, and the two ends of the crawler belt body are in butt joint, smooth meshing of the gear sprocket holes can be achieved, the foundation of a crawler belt type flexo printing mode is built, and meanwhile the manufacturing and using cost of the crawler belt is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of printing machines, and relates to a crawler belt for a printing plate of a flexographic printing machine, a crawler belt material for a printing plate of a flexographic printing machine, and a preparation method for a crawler belt for a printing plate of a flexographic printing machine. Background Art

[0002] In recent years, a crawler-type flexographic printing machine has appeared on the market, and its core component is the crawler transmission mechanism for the printing plate of the flexographic printing machine (application date: 2023-03-31, publication number: CN219600655U, patent number: ZL202320681753.8). This type of printing machine uses crawlers to replace traditional plate rollers, which has produced significant economic benefits, while improving the performance of the machine and reducing labor intensity. However, due to the current problems with the crawler, the service life is short, generally within 200,000 prints. There are three reasons for the short life of the crawler: First, the current crawler material is PE (polyethylene), PET (polyethylene terephthalate), PVC (polyvinyl chloride), PU (polyurethane) and other single materials. These single materials have weak resistance to fatigue damage. Second, holes are drilled on both sides of the track, and the lateral positioning has poor meshing conditions between the tooth holes and the gear teeth due to the deviation of dimension C, which generates additional lateral force and causes damage to the track. Third, the longitudinal hole spacing is not accurate, which causes tooth jumping when meshing with the gear and damages the track. Summary of the invention

[0003] The purpose of the present invention is to provide a crawler belt for a printing plate of a flexographic printing machine, which improves the arrangement of tooth holes and solves the problem of short service life of the crawler belt.

[0004] The purpose of the present invention is to provide a crawler material for a printing plate of a flexographic printing machine, which improves the fatigue damage resistance of the existing crawler.

[0005] The purpose of the present invention is to provide a method for preparing a crawler belt for a printing plate of a flexographic printing machine, which solves the problem of meshing transmission between crawler belt tooth holes and gears.

[0006] The first technical solution adopted by the present invention is that the crawler for the printing plate of the flexographic printing machine is arranged on roller A and roller B, and the left gear and the right gear with equal tooth pitch are respectively arranged at both ends of roller A, including a crawler body, and a row of tooth holes are respectively opened near the edge on both sides of the crawler body. The two rows of tooth holes are respectively arranged corresponding to the positions of the left gear and the right gear, the tooth width of the left gear is equal to the hole width of the corresponding row of tooth holes, and the tooth width of the right gear is smaller than the hole width of the corresponding row of tooth holes.

[0007] The first technical solution of the present invention is also characterized in that:

[0008] The tooth holes in each row are evenly spaced.

[0009] When the track is flat, the distance between each row of tooth holes is smaller than the left gear pitch.

[0010] The edges of the tooth holes in the transmission direction of the crawler body are arranged as two parallel straight lines.

[0011] The second technical solution adopted by the present invention is that the crawler material for printing plate of a printing press comprises a crawler body including a rubber layer and a cloth layer arranged upper and lower, the material of the rubber layer is elastic material, and the material of the cloth layer is fiber woven cloth.

[0012] The second technical solution of the present invention is also characterized in that:

[0013] The material of the adhesive layer is one of polyvinyl chloride (PVC), polyurethane (PU), and rubber; the material of the cloth layer is one of cotton cloth, nylon cloth, and polyester fiber cloth.

[0014] The third technical solution adopted by the present invention is a method for preparing a crawler belt for a flexographic printing press printing plate, which is used to prepare the crawler belt for a flexographic printing press printing plate of the present invention, and is specifically implemented according to the following steps:

[0015] Step 1: Use laser to open two rows of tooth holes on the flattened track body material, and the hole pitch of the tooth holes is smaller than the tooth pitch of the left gear;

[0016] Step 2: Use laser to cut the required size and shape of the track body on the track body material with perforations;

[0017] Step 3, butt-join the two ends of the crawler body cut in step 2 and roll them into a ring shape, butt-join the tooth holes at the two joints of the annular crawler body through patches, specifically, after butt-jointing the tooth holes of the two joints, use patches to fix the butt joint positions of the tooth holes; the two joints of the annular crawler body without tooth holes are connected by overlapping.

[0018] The third technical solution of the present invention is also characterized in that:

[0019] The crawler body cut in step 2 has the overlap required for butt jointing at the non-tooth hole portion of the joint of the annular crawler body in step 3.

[0020] In step 3, the two layers of the track body at the overlap are ultrasonically welded, and the two patches at the joint are also ultrasonically welded to the left and right tooth holes on the upper surface of the track body, and holes are opened on the patches at positions corresponding to the tooth holes to expose the tooth holes.

[0021] The beneficial effects of the present invention are:

[0022] The crawler for the printing plate of the flexographic printing machine of the present invention greatly enhances the fatigue damage resistance of the crawler, and the service life is increased by more than ten times; the problem that the crawler tooth holes are damaged due to lateral force generated by lateral size deviation is avoided; the longitudinal tooth pitch accuracy is improved, and the occurrence of tooth jumping is avoided.

[0023] The crawler material for the printing plate of the flexographic printing machine of the present invention can prevent the tooth holes from being damaged in a long-term meshing transmission state.

[0024] The method for preparing a crawler belt for a printing plate of a flexographic printing machine of the present invention can realize smooth meshing of gear tooth holes, build a foundation for a crawler-type flexographic printing method, and reduce the manufacturing and use costs of the crawler belt at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure in which the crawler for the printing plate of the flexographic printing machine of the present invention is arranged on rollers A and B;

[0026] Figure 2 It is a schematic structural diagram of a crawler belt for a printing plate of a flexographic printing machine according to the present invention;

[0027] Figure 3 It is a schematic diagram of the crawler body material of the crawler for the printing plate of the flexographic printing machine of the present invention.

[0028] In the figure, 1. roller A, 2. roller B, 3. left gear, 4. track body, 5. tooth holes, 6. rubber layer, 7. cloth layer, 8. printing plate, 9. double-sided tape, 10. right gear. DETAILED DESCRIPTION

[0029] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Example 1

[0031] This embodiment provides a crawler belt for a flexographic printing press printing plate, such as Figure 1 As shown, it is arranged on roller A1 and roller B2, roller A1 is provided with a left gear 3 near the left end, and roller A1 is provided with a right gear 10 near the right end, and the tooth pitch of the left gear 3 and the right gear 10 is equal, as shown in FIG. Figure 2 As shown, it includes a crawler body 4, a double-sided tape 9 is attached to the crawler body 4, a printing plate 8 (flexographic plate) is attached to the double-sided tape 9, a row of tooth holes 5 are provided near the edge of both sides of the crawler body 4, the two rows of tooth holes are respectively arranged corresponding to the positions of the left gear 3 and the right gear 10, each row of tooth holes 5 is equidistantly distributed, the tooth holes 5 are respectively arranged corresponding to the positions of the left gear 3 and the right gear 10, the tooth holes 5 enable the crawler to have the function of precise positioning transmission, and have excellent anti-fatigue damage performance, the tooth holes 5 are located in the transmission direction of the crawler body 4 The edges are set as two parallel straight lines, the hole widths of the two rows of tooth holes 5 are different, the tooth width of the left gear 3 is equal to the hole width of the corresponding row of tooth holes 5, and the actual deviation is within 0.4mm. The tooth width of the right gear 10 is smaller than the hole width of the corresponding row of tooth holes 5, and the difference between the hole width of the corresponding row of tooth holes 5 and the tooth width of the right gear 10 is greater than 0.4mm. The hole width of the other row of tooth holes 5 is larger than the tooth width of the right gear 10, and the distance between each row of tooth holes 5 is smaller than the tooth pitch of the left gear 3. The tooth pitch of the left gear 3 and the right gear 10 are the same, and the tooth widths can be the same or different.

[0032] The lateral dimension (hole width) of the right row of gear holes 5 is made larger than the tooth width of the right gear 10 to eliminate the lateral force. Figure 2 As shown, the width of the tooth hole 5 on the left side (dimension a) is equal to the width of the left gear 10. In fact, there is a certain error, that is, the size of dimension a is approximately equal to the tooth width of the left gear 3; the width of the tooth hole 5 on the right side is greater than the tooth width of the right gear 10, that is, the width of dimension b is greater than the tooth width of the right gear 10. In the working state, the lateral positioning of the track is completed by the left tooth hole 5, and the right side does not participate in the lateral positioning of the track. The upper and lower sides of the tooth hole 5 are straight lines, so when the right tooth hole 5 is laterally offset relative to the right gear 10, it will not affect the longitudinal (direction of track movement) transmission coordination. To eliminate lateral forces, the left and right sides of the tooth hole can be straight lines, semicircles, or curves. The principle of eliminating lateral forces on the track is to change the left and right bilateral lateral positioning (over-positioning) to single-sided lateral positioning.

[0033] The left and right rows of tooth holes 5 of the crawler track have different sizes, which increases the tolerance of the crawler track to the hole spacing of the left and right rows of tooth holes 5 and avoids over-positioning.

[0034] In order to improve the dimensional accuracy of the longitudinal arrangement of the tooth holes 5 and realize the smooth meshing of the track tooth holes 5 for the printing plate of the flexographic printing machine with the left gear 3 and the right gear 10, it is necessary to reduce the pitch of the longitudinal arrangement (direction of track movement) of the tooth holes 5. Through experiments, it is found that the reduction rate is between 2% and 8%. That is, in the flattened state, the distance between the tooth holes 5 is smaller than the pitch of the left gear 3 and the right gear 10. Accordingly, the length of the track after flattening (cut and laid flat along the generatrix) is less than the repeated length of the printed product.

[0035] The reduction of the longitudinal hole spacing of the crawler track complies with the bending principle of the material, that is, when the material is bent, it will be stretched, pre-reduced and then stretched to a suitable size through bending. According to the reduction rate, the longitudinal arrangement accuracy of the tooth holes 5 is improved, and the tooth holes 5 can also be circular.

[0036] Example 2

[0037] This embodiment provides a crawler material for a flexographic printing press printing plate, which is used to prepare a crawler as in Example 1. Figure 3 As shown, the crawler body 4 includes a rubber layer 6 and a cloth layer 7 which are arranged above and below.

[0038] The material of the adhesive layer 6 is elastic material, and the material of the cloth layer 7 is fiber woven cloth.

[0039] Preferably, the material of the adhesive layer 6 is one of polyvinyl chloride (PVC), polyurethane (PU), and rubber; the material of the cloth layer 7 is one of cotton cloth, nylon cloth, and polyester fiber cloth.

[0040] At present, the most common track material on the market is the conveyor belt, and the general purpose of the conveyor belt is to convey materials. The fatigue damage of the track teeth holes is caused by repeated stress. Repeated stress will produce tiny cracks around the teeth holes. When the track is working, this crack will gradually expand over time until the track breaks. The key to solving the problem of fatigue damage is to prevent the expansion of tiny cracks. The fiber layer (cotton cloth, nylon cloth, polyester fiber cloth) in the track material for the flexographic printing machine printing plate of the present invention enhances the tensile strength of the material at the macro level; at the micro level, the fiber layer can enhance the fatigue damage resistance of the material. The service life of a single material is less than 200,000 prints, and the service life of a composite material is more than 2 million prints. The fiber layer has a preset "stitching" effect on all tiny cracks. That is, there are always some fibers that are approximately perpendicular to the crack direction, exerting tension in opposite directions on the adhesive layer materials on both sides of the crack to offset the reverse tension (stress) required for crack expansion.

[0041] The crawler material for the printing plate of the flexographic printing machine of the present invention can be a two-layer composite or a multi-layer composite.

[0042] The so-called multi-layer composite is two or more layers of cloth and two or more layers of rubber (elastomer) arranged alternately, that is, one layer of cloth, one layer of rubber, and then one layer of cloth and one layer of rubber, arranged in sequence.

[0043] The tooth holes are processed on the composite material, and the excellent fatigue resistance of the composite material is utilized to make it have the function of precise transmission. It is applied to the crawler belt of the flexographic printing machine, which significantly improves the service life of the crawler belt.

[0044] Example 3

[0045] This embodiment provides a method for preparing a crawler belt for a flexographic printing press, which is used to prepare a crawler belt for a flexographic printing press as in Example 1, and is specifically implemented according to the following steps:

[0046] Step 1: Use laser to open two rows of tooth holes 5 on the track body material in a flat state, and the hole pitch of the tooth holes 5 is smaller than the tooth pitch of the left gear 3;

[0047] Step 2: Use laser to cut the track body 4 into the required size and shape on the track body material with the tooth holes 5;

[0048] Step 3, butt-join the two ends of the crawler body 4 cut in step 2 and roll them into a ring shape, butt-join the tooth holes of the two joints of the annular crawler body 4 by patching, specifically, butt-join the tooth holes 5 of the two joints and fix the butt joint position of the tooth holes 5 by patching; the joints of the annular crawler body 4 at the non-tooth holes are connected by overlapping, and the crawler body cut in step 2 has the overlap required for butt-joining the joints of the annular crawler body at the non-tooth holes in step 3;

[0049] The two layers of crawler bodies 4 at the overlap are ultrasonically welded, and the two patches at the butt joint are also ultrasonically welded on the upper surface of the crawler body 4. The patches are opened at positions corresponding to the tooth holes 5 to expose the tooth holes. The use of ultrasonic welding can improve the production efficiency and prevent the crawler from overheating and deformation. In addition, the two layers of crawler bodies 4 at the overlap are provided with corresponding positioning holes to facilitate positioning of the overlap position, and the two patches at the butt joint and the crawler body 4 sandwiched in the middle are also provided with corresponding positioning holes to facilitate positioning of the butt joint position.

[0050] From the above content, it can be seen that the present invention has found the excellent fatigue resistance of the fiber-reinforced composite material (conveyor belt), and applied it to the manufacturing process of the flexographic track for the flexographic printing machine (tooth hole processing), which greatly improves the service life of the track;

[0051] There are double rows of holes on the left and right sides of the crawler, one row of holes is the same width as the meshing gear, and the other row of holes is wider than the meshing gear, which solves the problem of lateral over-positioning;

[0052] By applying the bending principle, the longitudinal hole distance (direction of track movement) is reduced to solve the problem of tooth skipping and make the track tooth holes and gears mesh smoothly.

Claims

1. A crawler belt for a printing plate of a flexographic printing machine, arranged on a roller A (1) and a roller B (2), wherein a left gear (3) and a right gear (10) with equal tooth pitch are arranged at both ends of the roller A (1), characterized in that: The crawler body (4) comprises a row of tooth holes (5) respectively arranged near the edge of both sides of the crawler body (4); the two rows of tooth holes (5) are respectively arranged corresponding to the positions of a left gear (3) and a right gear (10); the tooth width of the left gear (3) is equal to the hole width of the corresponding row of tooth holes (5); and the tooth width of the right gear (10) is smaller than the hole width of the corresponding row of tooth holes (5).

2. The crawler belt for a flexographic printing press printing plate according to claim 1, characterized in that: Each row of tooth holes (5) is distributed at equal distances.

3. The crawler belt for a flexographic printing press printing plate according to claim 1, characterized in that: When the crawler body (4) is flattened, the distance between the tooth holes (5) is smaller than the tooth pitch of the left gear (3).

4. The crawler belt for a flexographic printing press printing plate according to claim 1, characterized in that: The edges of the tooth holes (5) located in the transmission direction of the crawler body (4) are arranged as two parallel straight lines.

5. A crawler material for a printing press plate, characterized in that: The crawler body (4) comprises a rubber layer (6) and a cloth layer (7) arranged above and below, the rubber layer (6) being made of an elastic material, and the cloth layer (7) being made of a fiber woven cloth.

6. The crawler material for a printing press plate according to claim 5, characterized in that: The material of the adhesive layer (6) is one of polyvinyl chloride (PVC), polyurethane (PU), and rubber; the material of the cloth layer (7) is one of cotton cloth, nylon cloth, and polyester fiber cloth.

7. A method for preparing a printing plate crawler for a flexographic printing machine, for preparing the printing plate crawler for a flexographic printing machine as claimed in claim 1, characterized in that: Follow the steps below to implement it: Step 1: Use laser to open two rows of tooth holes (5) on the track body material in a flattened state, and the hole pitch of the tooth holes (5) is smaller than the tooth pitch of the left gear (3); Step 2: Using laser to cut the track body (4) into the required size and shape on the track body material with the tooth holes (5); Step 3, butt-join the two ends of the crawler body 4 cut in step 2 and roll them into a ring shape, and butt-join the tooth holes of the two joints of the annular crawler body (4) by patching, specifically, after butt-jointing the tooth holes (5) of the two joints, use the patch to fix the butt joint position of the tooth holes (5); the two joints of the annular crawler body (4) at the non-tooth holes are connected by overlapping.

8. The method for preparing a crawler belt for a flexographic printing press printing plate according to claim 7, characterized in that: The crawler body cut in step 2 has the overlap required for butt jointing of the non-tooth hole joint of the annular crawler body (4) in step 3.

9. The method for preparing a crawler belt for a flexographic printing press printing plate according to claim 7, characterized in that: In step 3, the two layers of the crawler body (4) at the overlap are ultrasonically welded, and the two patches at the joint are also ultrasonically welded to the upper surface of the crawler body (4), and holes are opened on the patches at positions corresponding to the tooth holes (5) to expose the tooth holes (5).

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