Method for preventing flying glue during lamination operation of a glue laminating corrugated laminator

Abstract

The application discloses a method for preventing glue flying during lamination operation of a glue printing corrugated laminating machine, which comprises the following steps: firstly, a glue receiving roller is arranged in a 60-degree angle space behind a glue roller and a corrugated board, and the glue receiving roller rotates synchronously with the glue roller; a glue collecting groove is arranged behind the glue receiving roller, the inner side wall of the glue collecting groove is attached to the rear roller surface of the glue receiving roller, the outer side wall of the glue collecting groove extends to the roller surface of the glue roller, the outer side wall of the glue collecting groove is attached to the roller surface of the glue roller, and a closed glue collecting cavity is formed by the rear roller surface of the glue roller and the upper roller surface of the glue receiving roller; and a glue returning pipeline is arranged between the glue collecting groove and a glue supply basin of the laminating machine. The glue flying prevention device is designed and installed by using the idle space position of the equipment, the glue drops flying out are received by the glue receiving roller, the glue liquid flying out is collected by the glue collecting groove, the collected glue liquid is returned to the glue supply basin by the glue returning pipeline, and is recycled; the glue flying problem caused by the glue liquid with high viscosity during the lamination operation is solved fundamentally, and the product quality of the lamination operation is effectively improved.

Description

Technical Field

[0001] This invention relates to offset printing corrugated laminating machines, and more particularly to a method for preventing glue from flying during the laminating process of offset printing corrugated laminating machines. Background Technology

[0002] Fully automatic laminating machines are the most basic and commonly used equipment in the offset printing and corrugated packaging industry, used for high-speed automatic lamination of offset printing paper and corrugated cardboard.

[0003] Since its introduction in the 1990s, the fully automatic laminating machine has evolved into its third generation. It can automatically complete the gluing and laminating work, realizing high-speed lamination of offset paper and corrugated sheets.

[0004] During the laminating process, the laminating machine first applies the laminating adhesive to the corrugated cardboard using a gluing roller. Then, a conveyor belt carries the cardboard forward, bonding it to the preceding linerboard before it enters the press for curing. Due to the characteristics of the gluing system in currently used offset corrugated laminating machines, the use of high-viscosity laminating adhesive inevitably leads to "glue flying" (the centrifugal force of the high-speed rotating gluing rollers flinging out clumps of adhesive droplets). The higher the viscosity of the laminating adhesive, the more severe the glue flying problem becomes. Therefore, the industry has resorted to reducing the viscosity of the adhesive to mitigate this issue. With the continuous increase in laminating machine speed, the viscosity of the laminating adhesive has been reduced from 60 seconds to 20 seconds. However, using lower viscosity adhesives not only increases the amount of adhesive applied several times over but also causes cardboard warping due to excessive product humidity, reducing the compressive strength of the empty carton. Furthermore, in large-format cardboard processing, it can cause delamination at the tail of the cardboard, as well as severe exposed corrugations on the surface of the product, among other quality problems.

[0005] The "glue flying" phenomenon that occurs during the lamination process of offset corrugated cardboard laminating machines is fundamentally due to the excessive viscosity of the oxidized adhesive after oxidation and high degree of saccharification. After the adhesive is applied to the corrugated cardboard by the coating roller, the cardboard and the coating roller immediately separate in two different directions. Because high-speed laminating machines operate at speeds exceeding 3 meters per second, the rapidly rotating coating roller and the synchronously high-speed moving corrugated cardboard cause the freshly applied adhesive film to simultaneously separate and tear in two different directions. During this separation and tearing process, the highly viscous adhesive instantly shrinks and condenses into droplets. Under the high-speed centrifugal force generated by the rapidly rotating coating roller, these droplets are flung onto the back of the paper feed bridge cover, and then drip from the back of the cover onto the corrugated cardboard below, causing serious contamination. This phenomenon has become a persistent problem in offset corrugated cardboard laminating operations. Summary of the Invention

[0006] The purpose of this invention is to address a long-standing technical problem in the industry by providing a method to prevent glue flying during the lamination process of an offset corrugated laminating machine. This method allows the high-speed laminating machine to use high-viscosity laminating adhesive while avoiding the "glue flying" phenomenon.

[0007] To achieve the above objectives, the present invention can adopt the following technical solutions:

[0008] The method for preventing adhesive from flying during the lamination process of the offset corrugated sheeting machine described in this invention is as follows:

[0009] First, a receiving roller that rotates synchronously with the coating roller is installed in the 60° angle space between the coating roller and the corrugated cardboard. The receiving roller catches the glue droplets flying off the coating roller. To ensure the glue collection effect, the axial length of the receiving roller is the same as the length of the coating roller, and its roller diameter is smaller than that of the coating roller. It should be matched with the roller diameter of the coating roller so that it can just block the corrugated cardboard under the coating roller from rotating clockwise by 60°. In order not to affect the normal operation of the laminating machine, the height of the bottom plane of the axial direction of the receiving roller should be slightly higher than that of the bottom plane of the axial direction of the coating roller to avoid the receiving roller touching the corrugated cardboard that has been coated with glue.

[0010] A glue collection trough is provided behind the glue receiving roller to collect the adhesive adhering to the roller surface of the glue receiving roller; the inner sidewall of the glue collection trough is attached to the rear roller surface of the glue receiving roller, and its outer sidewall extends inward and upward to the roller surface of the glue coating roller, and its edge is attached to the roller surface of the glue coating roller, forming a closed glue collection cavity with the help of the rear roller surface of the glue coating roller and the upper roller surface of the glue receiving roller.

[0011] A return pipe is installed between the glue collection tank and the glue supply basin of the laminating machine to return the recovered laminating glue in the glue collection tank to the glue supply basin so that the glue supply system of the laminating machine can be recycled.

[0012] When the corrugated sheets to be processed are fed to the paper feeding table in sequence, the corrugated sheets laid flat on the paper feeding table move to the bottom of the coating roller, the coating roller rolls the adhesive on the roller surface onto the corrugated tip of the corrugated sheet surface.

[0013] As the corrugated sheet continues to move forward, it separates from the high-speed rotating glue-coating roller at high speed. The adhesive adhering between the glue-coating roller and the corrugated sheet is thrown out by the centrifugal force of the high-speed rotating glue-coating roller, and then caught by the synchronously rotating glue-receiving roller. After rotating to the inside, it is scraped off the inner wall of the glue collection tank and flows into the glue collection tank. At the same time, the remaining glue film on the glue-coating roller surface is scraped off the outer wall of the glue collection tank and flows into the glue collection tank, completely eliminating the phenomenon of glue flying and contaminating the corrugated cardboard.

[0014] Once the adhesive collected in the adhesive collection tank reaches a certain amount, it is returned to the adhesive supply basin through the adhesive return pipe for reuse.

[0015] To ensure effective glue scraping, both the inner and outer edges of the glue collection groove are scraper-like structures.

[0016] The outer wall of the glue collection tank is provided with mounting buckles so that the mounting rod of the glue collection tank can fix the glue collection tank to the wall panels on both sides of the laminating machine; at the same time, it also facilitates the adjustment of the fit between the edge of the glue collection tank and the glue application roller and the glue receiving roller.

[0017] The advantages of this invention lie in its design and installation of an anti-splash glue device in the unused space of the equipment. The device has a simple structure, complete functions, significant effect, and reasonable process, and it does not interfere with the normal operation of the laminating machine. During lamination, a receiving roller catches the splashed glue droplets, and the splashed glue is recovered through a collection tank. The collected glue is then returned to the laminating machine's glue supply basin for recycling via a return pipe. This method not only fundamentally solves the problem of glue splashing when using high-viscosity glue during lamination operations, but also effectively improves the product quality of lamination operations. Furthermore, the collected glue can be recycled, reducing glue usage costs. Attached Figure Description

[0018] Figure 1 This is a simplified structural diagram of the adhesive application process of the present invention.

[0019] Figure 2 yes Figure 1 Enlarged view of part A. Detailed Implementation

[0020] The present application will now be described in more detail with reference to the accompanying drawings to facilitate understanding by those skilled in the art.

[0021] like Figure 1 , Figure 2 As shown, when the laminating machine is working, the glue-spraying position of the glue-applying roller 03 is at the tangent point between the roller surface and the glued corrugated sheet, along the direction of separation at the tangent point, that is, within the 60° angle range between the glued corrugated sheet and the glue-applying roller 03. Therefore, it is necessary to first apply glue behind the glue-applying roller 03 ( Figure 1 Install an anti-spraying device at location A in the middle:

[0022] First, a receiving roller 1, rotating synchronously with the coating roller, is installed in the 60° angle space between the coating roller 03 and the coated corrugated cardboard. The receiving roller 1 catches the glue droplets flying off the coating roller 03. The axial length of the receiving roller 1 is the same as the length of the coating roller 03, and its roller diameter is matched to the coating roller's diameter, ideally just enough to block the 60° clockwise rotation angle of the corrugated cardboard below the coating roller. A glue collection trough 2 is installed behind the receiving roller 1. This ensures that the glue droplets flying off the coating roller 03 are completely collected and prevents high-speed rotation from causing further glue loss. The rotating glue receiving roller 1 causes a second glue splatter. The inner side wall of the glue collecting trough 2 is attached to the rear roller surface of the glue receiving roller 1 along the scraper edge. Its outer side wall extends inward and upward to the roller surface of the glue coating roller 03, and its scraper edge is attached to the roller surface of the glue coating roller 03 (to facilitate scraping off the remaining glue film on the roller surface of the glue coating roller 03). A closed glue collecting cavity is formed by the rear roller surface of the glue coating roller 03 and the upper roller surface of the glue receiving roller 1. A return glue pipe is also provided between the glue collecting trough 2 and the glue supply basin of the laminating machine to return the glue collected in the glue collecting trough to the glue supply basin so that the glue supply system of the laminating machine can be used in a cycle.

[0023] Before the laminating machine starts working, adjust the gap between the glue control roller 02 and the glue application roller 03 according to the size of the corrugated sheet to be processed, so that the glue film thickness on the surface of the glue application roller 03 can meet the requirements of different corrugation shapes for the amount of glue applied; then adjust the position of the glue collection trough 2 so that the gap and pressure between the edges (blades) of the inner and outer walls of the glue collection trough 2 and the surfaces of the glue application roller and the glue receiving roller are appropriate (so that the glue on the two roller surfaces can be completely scraped off and collected into the glue collection trough during the high-speed rotation of the glue application roller 03 and the glue receiving roller 1). Then start the operation:

[0024] The corrugated sheets 01 to be processed are sequentially fed to the paper feeding table 06 by the paper feeding table 05. When the corrugated sheets 01 laid flat on the paper feeding table 06 run to the bottom of the glue coating roller 03, the glue coating roller 03 rolls the adhesive on the roller surface onto the corrugated tips of the corrugated sheets 01.

[0025] As the corrugated sheet 01 continues to move forward, it separates from the high-speed rotating glue-coating roller 03. Since both the surface of the corrugated sheet 01 and the roller surface of the glue-coating roller 03 are coated with glue, the corrugated sheet 01 and the glue-coating roller 03 each carry the glue liquid as they move.

[0026] Because the corrugated sheet 01 moves horizontally forward, the adhesive it carries will not cause glue splattering; because the coating roller 03 moves in a high-speed circular motion, the adhesive film carried up during separation will quickly condense into glue droplets and be thrown away by the centrifugal force of the coating roller 03.

[0027] The glue droplets thrown out by the centrifugal force of the glue-applying roller 03 fly forward in an arc. The flying glue droplets are caught by the roller surface of the glue-receiving roller 1 in front. The glue-receiving roller 1, which is also rotating at high speed, rotates the adhesive on the roller surface to the inside. It is scraped off by the blade on the inner wall of the glue collection tank 2 and stored in the glue collection tank. The remaining glue film on the roller surface of the glue-applying roller 03 is also scraped off by the blade on the outer wall of the glue collection tank 2 and flows into the glue collection tank, completely eliminating the phenomenon of glue flying and contaminating the corrugated cardboard.

[0028] As the amount of adhesive in the collection tank increases, the collected adhesive will return to the adhesive supply basin of the laminating machine through the return pipe. The adhesive supply system will then transport it to the adhesive pool formed between the control roller 02 and the coating roller 03 for recycling.

[0029] To facilitate adjustment and installation, mounting buckles 3 are provided on the outer wall surface of the glue collection tank 2. When installing the glue collection tank 2, the mounting rod is inserted through the mounting buckle and the two ends of the mounting rod are fixed to the fixing blocks on the side walls of the frame.

[0030] When it is necessary to adjust the gap and pressure between the outer wall blade of the glue collection tank 2 and the glue application roller surface, and between the inner wall blade and the glue receiving roller surface, this can be easily achieved by adjusting the front and rear gaps between the two ends of the mounting rod fixed to the fixing block. In actual use, other conventional methods can also be used to fix and adjust the glue collection tank 2, as long as the usage requirements are met.

Claims

1. A method for preventing adhesive from flying during the lamination process of an offset corrugated sheeting machine, characterized in that: First, a receiving roller that rotates synchronously with the coating roller is installed in the 60° space between the coating roller and the corrugated sheet; the axial length of the receiving roller is the same as the length of the coating roller, and its roller diameter is matched with the roller diameter of the coating roller. A glue collection groove is provided behind the glue receiving roller; the inner sidewall of the glue collection groove is attached to the rear roller surface of the glue receiving roller, and its outer sidewall extends inward and upward to the roller surface of the glue coating roller, with its edge attached to the roller surface of the glue coating roller, forming a closed glue collection cavity with the help of the rear roller surface of the glue coating roller and the upper roller surface of the glue receiving roller. A return pipe is installed between the glue collection tank and the glue supply basin of the laminating machine; When the corrugated sheets to be processed are fed to the paper feeding table in sequence, and the corrugated sheets laid flat on the paper feeding table move to the bottom of the coating roller, the coating roller rolls the adhesive on the roller surface onto the corrugated tips of the corrugated sheet. As the corrugated sheet continues to move forward, it separates from the high-speed rotating glue-coating roller at high speed. The adhesive adhering between the glue-coating roller and the corrugated sheet is thrown out by the centrifugal force of the high-speed rotating glue-coating roller, and then caught by the synchronously rotating glue-receiving roller. After rotating to the inside, it is scraped off the inner wall of the glue collection tank and flows into the glue collection tank. At the same time, the remaining glue film on the glue-coating roller surface is scraped off the outer wall of the glue collection tank and flows into the glue collection tank, completely eliminating the phenomenon of glue flying and contaminating the corrugated sheet. Once the adhesive collected in the adhesive collection tank reaches a certain amount, it is returned to the adhesive supply basin through the adhesive return pipe for reuse.

2. The method for preventing adhesive from flying during the lamination process of an offset corrugated sheeting machine according to claim 1, characterized in that: Both the inner and outer edges of the adhesive collection tank are scraper structures.

3. The method for preventing adhesive from flying during the lamination process of an offset corrugated sheeting machine according to claim 1, characterized in that: The outer wall of the adhesive collection tank is provided with mounting buckles.

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