SU764603A3 - Support coating device - Google Patents

Abstract

Web coating apparatus such as for impregnating cardboard for making corrugated cardboard sheet has a container (1) with a partition across, with a curved upper surface forming a channel (2) curved towards the applicator drum (4) above, with a set of partitions (3) across it. These, together with a vertical baffle (12) prevent turbulence of the coating substance inside the container which can be heated. They then maintain an even temperature. Horizontal plates (5, 20) against the drum, control the thickness of material on its surface. Two rollers (6) above for guiding the web towards the drum can be adjusted to vary the angle at which the web is applied. Two take off rollers (8, 9) to tension the web can also be swung upwards to vary the delivery angle. A scraper blade (17) follows the second (9) of these two rollers.

Description

schA thermosurface. The container 1 is divided into a number of sections: the first, called the feeding section 2, is designed to contain the coating material and can have a cylindrical shape extending to the side opposite to the supply of the coating material supplied by means of.

in section 2, the level of the adapter is kept constant by means of a set of removable and height-adjustable partitions 3,,

Capacity 1 also includes cekiiHib

4, referred to as regenerating, connected by pipeline 5C with a reservoir for the coating material. This regenerating section is designed to receive excess material, & which comes as a result of overflow from the supply section 2, and excess material: entrained by applying Top 6 and removed by means of 7 for dosing. It also regenerates the material removed by the smoothing roller 8.

The application roller 6, having a relatively large diameter, is made, for example, of high carbon chrome steel. It rotates with by moving the substrate 9. The roller may also be rotated in the opposite direction as the substrate is pulled. In this case, the dosing means 7 is installed on the right. If the coating material is hot melt, the roller 6 is scooped up by circulating the coolant. The height at which it sinks into the solution, regulated by the height of the solution itself, is determined by the height of the removable partitions 3. The contact surface of the cover of the 11th substrate is limited by the arc (ab), the length of which is is a parameter having an important role for the quality of the coating. In case the material is refractory, it is effective. adjust the thickness by varying the temperature of the smoothing roller 8, and the thickness of this VapaHee layer is controlled by the first metering means 7, which scrapes a layer of material carried along by the nano roll before the substrate to be coated comes into contact with it. This dosing means includes a scraper located at the disposal of the applying roller b at the entrance to the zone of contact of the substrate with the coating material. The value of e corresponds to the thickness of the layer of material, the scraper 10, made in the form of the side walls of plastic made of plastic

or another heat-resistant material, designed to clean the jaHO of the pressing roller 6. It provides a tool to bruise the edges of the substrate 9. Section 2 contains a means 11 for stabilizing the solution, made in the form of

764603

a set of fixed blades mounted parallel to the axis of the applying roller and installed in the tank under the applying roller. The position of the stabilization agent is adjusted relative to the depositional mortar by means of, for example, a screw, the deviation of the end of the blades depending on the required thickness of the layer. The purpose of this means 11 is to prevent the entrainment of the coating material, causing circulation inside the vessel. It provides effective wetting of the applied roller due to dilutions, creating holes on the blades parallel to the axis of the applying roller.

The smoothing roller 8 is installed behind the application roller and in front of the Substrate Drive system, only schematically depicted by arrow B in Fig. 1, or a lamination press in the case where two bands must be glued together. The smoothing roller 8 has a smaller diameter than the diameter of the applying roller and is made of high carbon chrome steel. Roller 8 is provided with a tilting scraper 12, which removes excess material. The device also comprises a device 13 for guiding the substrate and contacting it with the applying roller 6 at the time of coating and withdrawing it from the inactive position to the tension roller 14.

The operation of the device is carried out in the following manner.

The material of the coating is pumped into the supply section 2 of the container 1. The application roller 6, partially immersed in the solution of the material of the coating, entrains some while rotating. the amount of this material. The device 13 for guiding the substrate locally holds it in contact with the application roller 6, thus transferring the coating material to the substrate 9. The amount of material transferred per unit surface of the substrate depends on the accuracy of the dispensing means 7 with respect to to the application roller 6. This tool serves as a pre-batcher. The thickness adjustment is mainly determined by the temperature and the rotation speed of the smoothing roller 8. This speed can be controlled independently of. rotational speed of the application roller.

The stabilization means 11 allows the material to circulate in the vessel without turbulence and pre-calibrates the layer. Thereby, B1 prevents air bubbles from entering the material and reduces pressure on the scraper.

The application roller 6 is mounted rotatably in the direction opposite to the direction of the substrate being pulled, by means of an adjustable rotation speed device.

When the substrate is in contact with the surface of the deposition roller, the coating material carried by the roller is entrained, this substrate is exposed to the side of the tool 13 for guiding the substrate. In the working position, the tension roller 14 contacts the coated substrate with a smoothing roller that performs a dual function on the one hand, smoothes the material on the substrate, and on the other hand regulates the thickness of the applied layer. If the material used for the coating is hot melt, the smoothing roller 8 is also heated by circulating the heat transfer medium. The forming roller 8 is in contact with the coated substrate, perfectly clean, so as not to leave marks on the applied layer. This is achieved through the use of a swivel scraper 12, due to no excess material. The coating material removed by the dosing means 7 and smoothing with a roller 8 is discharged into the tank 1, from where it is fed through the pipeline 5 to the regeneration tank. The thickness is adjusted and the applied layer is smoothed by changing the speed of rotation of the roller 8 and its temperature. As the rotation speed of the smoothing roller increases, the thickness of the applied layer decreases.

This device can be used to make corrugated cardboard at maximum operating speed.

In this case, the coating material (a mixture of wax and paraffin with the addition of resin or polymer) is applied on paper or cardboard stripes, then going to the manufacture of corrugated paper or cardboard.

The device consists of a tank 1 with several sections, of which the section called pit 2 contains a coating material such as wax with a primer, stabilization means 11 providing uniform temperature distribution and circulation without vortexing the material coating 2 applying roller 6, partially immersed in solution, means 7 for metering the thickness of the material carried by the material 13 of the material to be coated, capable of holding this strip locally either in contact with the deposited conductive roller used when this circuit is in the operating position, which corresponds to the time in Techa, of which there is a coating, or at a distance from the position it is shown schematically by the broken line in FIG. 4) when there should not be any substrate, i.e. when the guide system is in an inoperative position, the tension roller 14, smoothing roller 8, from the scraper to be removed. excess material at the level of the said smoothing roller,

0 of the cooling system 15, presented in the form of a cooling drum, on which the substrate 9 is typically wound during processing before being fed into the corrugator.

five

This combination of means provides adjustment, independently of one another, of the main parameters on which the structure of the coating material layer depends.

0

The work is carried out as follows.

The wetting of the application roller 6 by the coating material, which in the case of strips of paper or paperboard, intended for the manufacture

5 corrugated paperboard, preferably waxed with an additive contained in section 2.

If this section is equipped with a stabilizing system 11, the solution is sub-. It is cast upon its action, but in the case of wax there is no need for its action, as the wax is liquid and does not have sufficient viscosity

5 for the formulation of problems associated with averaging at this level. In this case, the stabilizing system is not necessary, on the contrary, it can be very important in the case of significant additives of resins and polymers.

0

The first dosing of the thickness of the coating material carried along by the applying roller, to a certain thickness e, is carried out by the dosing means 7, system 13

5 presses the poked substrate to the roller, b, by transferring the core by the roller 6 to the surface of the substrate 9 brought into contact with the roller, this

0 transfer leads to the formation of dense spots.

With the passage of the substrate on the cooling drum 15, the target

5 which is the cooling of wax spots on the substrate surface, the latter are stuck.

The substrate then enters the grouting unit. . -,

Output Products

0 from the cooling drum 15, is a substrate coated with a mosaic type of wax spots, between which there are uncovered areas of the BOARD. This is partially covered 5

That substrate or, more precisely, a strip of paper or paperboard can then be guided to a corrugating installation of a known type. The coated strip is first grooved and then a rtepBoe flat cover is glued onto one surface, on the other side another flat cover is glued between which, in this way, the corrugated part is enclosed. The corrugated paperboard, however, has the required mechanical characteristics, since after the drying operation, which follows the gluing operation, wax waxes spread and diffuse, thus filling the Uncovered sections at the beginning. The result is a uniform layer covering: the entire corrugated surface.

The characteristics of the product obtained according to the invention are improved in comparison with the characteristics that would have been obtained using known means.

This improvement is not only an improvement in the degree of wax impregnation of the grooves, but also the impregnation method according to the invention, which mainly ensures an easier and more effective gluing of the blankets.

The use of this device will allow you to create production lines as cost-effective as possible, choosing the best ratio between increasing mechanical properties and moisture resistance and significantly improving the quality of COATING.

Claims (4)

1. Coating device for a substrate containing a container for a coating material, a roller, partially immersed in a solution of the coating material, a device to guide the substrate in contact with the coating roller, the dosing means and the drive of the substrate, characterized in that, in order to improve the quality of the coating, the container is equipped with a means for stabilizing the solution, made in the form of a set of vanes mounted under the applying roller parallel to its longitudinal axis. 2. The device according to item 1, that is, so that it is provided with a smoothing roller with a scraper. 3. The device is designed so that it is equipped with partitions installed in the tank. 4. A device according to Claims 1, 6, t of l and ate, so that the dosing means is provided with side grooves for cleaning the edges of the applying roller. . Sources of information taken into account in the examination 1. Patent of Great Britain 1345618, cl. D 1 L, pub. 01/30/74 (prototype)