DD268175A1 - DEVICE FOR APPLYING COATINGS TO MATERIAL RAILS - Google Patents

Abstract

The invention relates to a device for applying coating compositions to webs and bands. It is applicable in the production of coated film materials, especially signal-active films, color, drawing and engraving films. Particularly suitable are squeegee casters. According to the invention, in the case of a device consisting of pouring vessel and casting mold arranged thereon, a vibrating rod is arranged in the casting vessel in the immediate vicinity and parallel to the layer-forming casting doctor. This is connected to located outside the Giessergefaesse actuators with Schwingungsdaempfern. A vibration exciter is attached to a separate part of the Giessergefaess plant. The gap particles or bladders which interfere with the splitting parallelism are effectively removed without interrupting the coating process. Figures 1-3

Description

Field of application of the invention

The field of application extends to the production of coated film materials, especially signal-active films, color, intermediate and engraving films.

In particular, doctor blade casters are used.

Characteristic of the known technical solutions

Different foundries have been used to coat webs and tapes.

The choice of casting method depends on various factors, as well as the properties of the coating material, the coating solution, the quality features to be achieved and the dry layer thicknesses.

Each casting device is in turn a characteristic, intrinsic, according to which there is a functional relationship between material and coating parameters and the achievable layer thickness. A substantial influence on the layer thickness is exerted by the gap between the material web surfaces and the doctor blade present with doctoring casters. The splitting parallelism is of great importance for achieving a high quality coating. This parallelism is difficult to achieve, especially for achieving wet film thicknesses below 50pm, so that it may be due to coagulation of e.g. Solid components of the coating solution, insufficient filtration of the solution or by gas bubbles in the coating solution to narrowings in the gap, resulting in the grooves, scratches, streaks and other irregularities in the wet layer.

In DE-OS 2535107 a method is described in which for the detachment and cleaning of granular, small-sized or viscous goods in vessels the Gutteilchen be offset by electromagnetic sounder (speakers) in vibration.

The disadvantage is that the method is applicable only in vessels with relatively large free spaces, since the sound generator, due to the operating principle of the process in which the Gutteilchen containing vessel must be arranged.

DE-OS 2,633,111 describes a device for applying a coating composition to tape-like carrier materials, with the aid of the deterioration of the coating quality by the present in the casting gap solid particles (impurities) should be avoided, in which the doctor blade is provided with ehern elastic coating and a arched shape aufwei ' t.

The disadvantage is that elastic materials do not allow high dimensional accuracy and thus a reproducibility of the casting gap, in particular for wet film thicknesses below 50 pm can not be guaranteed.

Object of the invention

The object of the invention is to develop a device for applying coating compositions so that grooves, scratches, streaks and other irregularities in the wet layer are avoided.

Explanation of the essence of the invention

It is an object of the invention to design a device for applying coating compositions so that a continuous casting process with high coating quality can be done even with wet film thicknesses below 50μηι.

According to the invention, this object is achieved in that in an existing from Gießergefäß 2 and there arranged Gießerrakel 4 device in the creamer 2 in the immediate vicinity and parallel to the layer-forming Gießsrrakel 4 a vibrating rod 5 is arranged. This is connected to outside of the cistern 2 actuators 6 by means of vibration dampers 7. A vibration exciter 12 is attached to a separate from the cistern 2 plant part 14.

FIGS. 1, 2 and 3 schematically show the principle. Fig. 1 shows an embodiment in which the vibrating rod can act occlusive.

In Fig. 2, the front view of the device is shown.

Fig. 3 shows the position of the plunger and the vibration bolt in the closed state of the caster above the caster roll 1, the creamer vessel 2 is adjustably arranged so that the distance of the creamer blade 4 to the surface of the caster roll 1 is variable. At Gießerdeckel 3, the actuators 6 are attached to which the vibrating rod 5 is fixed in the caster vessel 2 by means of vibration dampers 7.

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At one of the foundry vessel 2 separate plant part 14 of the vibration exciter 12 with vibration bolt 10 on a plate 11 which is mounted on Schwir.gungsdämpfern 7 on the system part 14, respectively. A plunger 9, which is guided by a vibration-damped sleeve 13 in the caster lid 3, is fixedly connected to the vibration bar 5 acting simultaneously as Verschließkeil, and is pressed by means of actuators β against the vibration bolt 10.

AusfOhrungsbelsplel A provided in a known manner with adhesive layer PETP film is passed around a rotating casting roll, wherein a Run through the casting vessel with coating solution, using a doctor blade, the coating solution with a Wet layer thickness of 30μΓη applied and fed to the drying process. When occurring coating defects in the longitudinal direction, which is located in the coating solution Vibration rod excited by the vibration exciter via a plunger so that in front of or below the squeegee

solid particles, gelatinous components or any larger bubbles are displaced, destroyed or deformed. After eliminating the coating error, the vibration exciter is turned off. The frequency range and the

The magnitude of the vibration acceleration depends on the type and size of the disturbance or on the coating solution

dependent.

The advantages of the invention are that the solid particles or bubbles disturbing the gap parallel with Jt are effective without Interruption of the coating process can be eliminated. Material losses do not occur. An impairment of Foundry stability due to excessive mechanical stress does not occur. There are Naßschichtdicken smaller 50μηη with

high quality of the coating achieved.

In case of accidents emptying of the casting vessel is not required because the vibration rod then acts as a sealing wedge.

Claims (1)

Apparatus for applying coating residues to webs of material and strips, consisting of a foundry vessel and foundry doctor blade thereon, characterized in that a vibrating rod is arranged in the caster vessel in the immediate vicinity and parallel to the layer-forming caster, which is movably connected to actuators located outside the casting vessel and a vibration exciter is attached to a separate part of the Gießergefäß plant part. For this 1 page drawings