A device for preventing white lines on paper

Abstract

The utility model discloses a device for preventing white lines on paper surface, belonging to the technical field of papermaking process. The utility model comprises two sets of scraper rod seats and two glue tubes fixed in the operating side frame of the upper glue roller and the lower glue roller; the scraper rod seats are embedded with a scraper rod in sliding connection, and a lubrication groove is provided at the sliding connection between the scraper rod seat and the scraper rod; the working surfaces of the two scrapers are respectively facing the upper glue roller and the lower glue roller; the two ends of the glue tube are respectively fixedly connected and communicated with the lubrication groove and the glue pump, thereby solving the problem of white lines on the paper surface caused by the wear of the scraper rod during the glue application process of the papermaking glue roller.

Description

Technical Field

[0001] The utility model belongs to the technical field of papermaking technology, and more specifically relates to a device for preventing white lines on paper surface. Background Art

[0002] With the rapid development of social economy and printing technology, the level of printing equipment is constantly improving, and the requirements for paper quality are getting higher and higher. Therefore, sizing of paper in the papermaking industry has become an important step to improve the quality of paper products produced. Sizing refers to the process of adding sizing agents into the pulp or coating the surface of paper and paperboard to enhance the anti-penetration and anti-diffusion of paper and paperboard to the colloidal solution of writing ink and the oily carrier of printing ink. Through sizing, various properties of paper products can be significantly improved, the physical strength of paper and paperboard can be improved, the wrinkles and curling of paper can be reduced, the printing performance of paper products can be improved, the fuzzing and plate sticking during offset printing can be reduced, the flatness of paper can be improved, the oil and water resistance of paper and paperboard can be improved, the shape stability of paper products during application can be improved, and the durability and wear resistance of paper can be improved. It can be seen that the quality of sizing plays a key role in the performance of paper products. At present, there are two main types of sizing technologies: in-slurry sizing and surface sizing. In-slurry sizing is to add sizing agents to the pulp, and the sizing effect is achieved as the paper is dried. Surface sizing is to apply a film-forming substance on the formed paper sheet to control the porosity of the paper surface and improve the surface strength of the paper, while also making the paper surface water-resistant. Most of the paper and paperboard used in writing, printing, packaging and construction industries need to be treated with surface sizing. After sizing, they are dried and calendered to form paper. Compared with the internal sizing technology, surface sizing technology can save sizing agent and make up for some defects of the internal sizing technology. However, the biggest problem it faces is that the sizing quality is easily affected by many factors such as paper, coating and the sizing device itself, resulting in uneven sizing, which in turn affects the smoothness and strength of the paper surface. Therefore, it is crucial to reduce the sizing cost, improve the sizing quality and ensure the normal operation of production.

[0003] In the actual production process, factors such as the slight deformation of the glue beam or the glue roller will cause differences in the gaps between each point. When the gap is large, the glue is particularly strong, while the scraper rod will wear faster where the gap is smaller. When the scraper rod is worn, it will cause the glue nozzle to be blocked or the glue viscosity to change, which will lead to the formation of white lines on the paper surface, resulting in a large amount of defective paper, which has a great adverse impact on production. Utility Model Content

[0004] 1. Problem to be solved

[0005] Aiming at the problem of white lines on the paper surface caused by the wear of the scraper bar in the process of papermaking sizing in the prior art, the utility model provides a device for preventing white lines on the paper surface. The utility model continuously replenishes sizing lubrication in the lubrication groove to reduce the wear of the scraper bar, while ensuring timely lubrication of the scraper bar, extending the service life of the scraper bar, and solving the problem of white lines on the paper surface caused by the wear of the scraper bar.

[0006] 2. Technical solution

[0007] In order to solve the above problems, the technical solution adopted by the utility model is as follows:

[0008] A device for preventing white lines on paper surface, comprising two sets of scraper rod seats and two glue tubes fixed in the operating side frames of the upper glue roller and the lower glue roller; the scraper rod seats are embedded with a scraper rod in sliding connection, and a lubrication groove is provided at the sliding connection between the scraper rod seats and the scraper rods; the working surfaces of the two scraper rods are respectively facing the upper glue roller and the lower glue roller; the two ends of the glue tube are respectively fixedly connected to and communicated with the lubrication groove and the glue pump.

[0009] A further technical solution is to set a regulating valve on the rubber pipe to control the amount of glue added.

[0010] According to a further technical solution, a solenoid valve is arranged on the rubber pipe; the solenoid valve and the glue pump are both electrically connected to the electric control mechanism and the circuits of the two are switched on and off at the same time.

[0011] 3. Beneficial effects

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The utility model discloses a device for preventing white lines on the paper surface of papermaking, a lubrication groove is added to the scraper rod seat for automatic glue lubrication, and the lubricating glue liquid is automatically opened after gluing; while ensuring timely lubrication of the scraper rod, the service life of the scraper rod is extended, and the problem of white lines appearing on the paper surface due to scraper rod wear is solved; a solenoid valve can also be added to the lubrication channel of the scraper rod seat, and the chain is automatically opened after the pipeline is glued, to prevent the operator from forgetting to open it, resulting in abnormal wear of the scraper rod and white lines appearing on the paper surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of a device for preventing white lines on paper surface in a specific embodiment of the utility model;

[0015] Figure 2 It is a schematic cross-sectional structure diagram of a scraper rod holder according to a specific embodiment of the utility model.

[0016] In the figure: 1. Glue application upper roller; 2. Glue application lower roller; 3. Operating side frame; 4. Transmission side frame; 5. Scraper rod holder; 6. Glue pipe; 7. Glue application pump; 8. Regulating valve; 9. Solenoid valve; 10. Electric control mechanism; 51. Scraper rod; 52. Lubrication groove. DETAILED DESCRIPTION

[0017] The utility model is further described below in conjunction with specific embodiments.

[0018] Example 1

[0019] The device for preventing white lines on papermaking paper surface of the present embodiment is as follows: Figure 1 As shown, it includes two sets of scraper rod seats 5 and two rubber pipes 6 fixed in the operating side frame 3 of the upper glue roller 1 and the lower glue roller 2. The operating side frame 3 and the transmission side frame 4 are arranged opposite to each other, and the upper glue roller 1 and the lower glue roller 2 are rotatably connected between the two. The two rubber pipes 6 correspond to the upper glue roller 1 and the lower glue roller 2 respectively. Figure 2 As shown, a scraper rod 51 is embedded and slidably connected in the scraper rod holder 5, and a lubrication groove 52 is provided at the back sliding connection between the scraper rod holder 5 and the scraper rod 51; the forward working surfaces of the two scraper rods 51 are respectively facing the upper glue roller 1 and the lower glue roller 2; the two ends of the glue pipe 6 are respectively fixedly connected and communicated with the lubrication groove 52 and the glue pump 7.

[0020] In the device for preventing white lines on the paper surface of the present embodiment, in a specific application, the glue pump 7, the glue pipe 6 and the lubrication groove 52 form a lubrication channel for the scraper 51. The glue source of the glue pump 7 can be the same as the glue of the glue upper roller 1 and the glue lower roller 2. The glue in the lubrication groove automatically lubricates the scraper 51 with glue, thereby extending the service life of the scraper 51, thereby solving the problem of white lines on the paper surface caused by the wear of the scraper 51.

[0021] Example 2

[0022] The device for preventing white lines on the paper surface of this embodiment has the same basic structure as that of the first embodiment, and the difference or improvement is that a regulating valve 8 is provided on the glue pipe 6 to control the amount of glue to be added. A solenoid valve 9 is provided on the glue pipe 6; the solenoid valve 9 and the glue pump 7 are both electrically connected to the electric control mechanism 10, and the circuits of the two are simultaneously switched on and off, and the electric control mechanism 10 simultaneously controls the switching on and off of the glue circuits of the glue upper roller 1 and the glue lower roller 2, that is, after the glue is applied to the pipes of the glue upper roller 1 and the glue lower roller 2, the solenoid valve 9 of the glue pipe 6 is automatically opened in a chain, so as to prevent the operator from forgetting to open it, resulting in abnormal wear of the scraper 51 and the appearance of white lines on the paper surface.

[0023] The examples described in the present invention are merely descriptions of the preferred implementation modes of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made to the technical solutions of the present invention by engineers and technicians in this field shall fall within the protection scope of the present invention.

Claims

1. A device for preventing white lines on paper, characterized in that: The invention comprises two sets of scraper rod seats (5) and two rubber tubes (6) fixed in the operating side frame (3) of the upper glue application roller (1) and the lower glue application roller (2); a scraper rod (51) is embedded and slidably connected in the scraper rod seat (5), and a lubrication groove (52) is provided at the sliding connection between the scraper rod seat (5) and the scraper rod (51); the working surfaces of the two scraper rods (51) are respectively facing the upper glue application roller (1) and the lower glue application roller (2); and the two ends of the rubber tube (6) are respectively fixedly connected to and communicated with the lubrication groove (52) and the glue application pump (7).

2. The device for preventing white lines on paper surface according to claim 1, characterized in that: The rubber pipe (6) is provided with a regulating valve (8).

3. The device for preventing white lines on paper surface according to claim 1, characterized in that: The rubber tube (6) is provided with a solenoid valve (9); the solenoid valve (9) and the glue pump (7) are both electrically connected to an electric control mechanism (10), and the circuits are switched on and off simultaneously.

Images