JPH0526170U - Coater nozzle blowing gear adjustment device - Google Patents

Abstract

(57) [Summary] [Purpose] In a coater nozzle, even if the nozzle tip gap changes, coating unevenness does not occur and a good quality coated surface is obtained. [Structure] In a nozzle of various coaters for applying a liquid to a belt-shaped web of paper, film, metal, cloth or the like, by providing a jacket 11 for heating and cooling the outer periphery of the nozzle 2, the tip of the nozzle 2 The opening G of the gap 6 is adjusted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a coater nozzle blowout gap adjusting device which is applied to nozzles of various coaters and adjusts the opening of the gap at the nozzle tip.

[0002]

[Prior Art]

FIG. 5 shows an example of a conventional coater for applying a liquid to a web, where 1 is a backing roll, 2 is a nozzle, and 3 is a coater head. The heated liquid (40 ° C to 50 ° C) flows through the passage 2a of the nozzle 2 shown in Fig. 4, and the liquid is blown out from the nozzle tips 2b and 2b formed by the pair of lips 4 and 4. .. The blown liquid adheres to the web running along the outer peripheral surface of the backing roll 1 (film thickness T) and is scraped off by the blade 5 of the coater head 3 to form a thin uniform coat layer (film thickness t). .. The velocity v _i of the liquid blown out from the tip 2b of the nozzle 2 is determined by the opening G of the gap 6 of the tip 2b and the liquid supply amount Q. It is necessary to adjust the opening G or the supply amount Q in order to obtain the optimum blowing speed for transferring to the web. However, if the supply amount Q is adjusted, the film thickness T transferred to the web changes, The unevenness occurs. In addition, since we do not have a method to adjust the opening G, we could only obtain an insufficient quality.

The conventional nozzle 2 shown in FIGS. 6 and 7 is not provided with the lip 4 as shown in FIG. 4, but the passage 2a has a liquid heated (40 ° C. to 50 ° C.). Flow and the liquid is blown out from the pair of nozzle tips 2b, 2b. Liquid is introduced into the passage 2a from both sides of the nozzle 2 by the pipe 7. The liquid blown out as described above adheres to the web running along the outer peripheral surface of the backing roll 1 (film thickness T) and is scraped off by the blade 5 of the coater head 3 to form a thin uniform coat layer (film thickness t ). The velocity v _i of the liquid blown from the tip 2b of the nozzle 2 is determined by the opening G of the gap 6 of the tip 2b. In order to obtain a good quality coat layer t, the film thickness T transferred onto the web and the blowing speed v _i must be uniform and proper values in the width direction, but the conventional coater nozzle is adjusted. Since I don't own the product, I could only get the one with insufficient quality.

[0004]

[Problems to be solved by the device]

In conventional nozzle 2 shown in FIG. 4, V the peripheral speed of the backing roll 1, when the speed of the liquid to be blown from the gap 6 and v _i, a proper value that the ratio R of the V / v _i (U Ebb (The value required for the transfer to), that is, if the value of V is constant, the value of v _i becomes considerably small. Therefore, only a small amount of liquid adheres to the outer peripheral surface of the backing roll 1, and most of the liquid falls below the space between the nozzle 2 and the backing roll 1. Therefore, coating unevenness occurs in the liquid layer scraped off by the blade of the coater head in both the rotation direction and the paper width direction. Therefore, if V is increased in order to prevent this, transfer to the web becomes possible, but the amount of liquid blown out from the nozzle tip 2b increases, and as a result, the film thickness T increases. That is, since the film thickness is thicker than the appropriate value, when scraped by the blade of the coater head, it cannot be scraped uniformly and smoothly, resulting in uneven coating. Further, if the opening of the nozzle tip gap changes due to changes in the temperature of the liquid used and the ambient temperature, the liquid ejection speed and film thickness required for transfer change as described above, resulting in uneven film thickness. was there.

Further, in the conventional nozzle shown in FIGS. 2 and 3, if the opening degree of the pair of nozzle tips is not uniform in the width direction of the nozzle 2, the coat is applied in the width direction (axial direction) of the backing roll 1. A difference occurs in the film thickness (hereinafter referred to as profile) of the liquid to be formed, and uneven coating occurs in the width direction of this roll. Further, the ratio V / v _i = R of the outflow velocity v _{i of the} liquid blown out from the nozzle tip gap 6 determined by the opening G of the nozzle tip in each partial cross section of the nozzle 2 and the velocity V of the backing roll 1 is appropriate. When the value exceeds the value (value required for transfer to the web), the transferred film thickness T in the rotating direction of the backing roll 1 becomes thicker than an appropriate value, causing uneven coating. Further, even if the liquid or the ambient temperature changes, the gap 6 at the tip of the nozzle changes and the above-mentioned trouble occurs. Therefore, the gap at the tip of the coater nozzle is adjusted over the entire width of the coater nozzle. However, with this adjustment, the waviness of the profile cannot be adjusted, so it was impossible to eliminate uneven coating in the width direction of the backing roll.

[0006]

[Means for Solving the Problems]

 Therefore, according to the present invention, in the nozzle of various coaters that applies liquid to a belt-shaped web such as paper, film, metal, cloth, etc., by heating and cooling the outer periphery of the nozzle, the tip gap of the nozzle is The degree of opening is adjusted, and this is used as a means for solving the problem.

Further, the present invention is a nozzle of various coaters for applying a liquid to a belt-shaped web such as paper, film, metal, cloth, etc. By providing a plurality of sections and individually heating and cooling the sections, the opening of the nozzle tip gap is adjusted for each section, and the profile of the nozzle tip in the width direction is adjusted. This is a means to solve the problem.

[0008]

[Action]

 By heating and cooling the outer circumference of the nozzle, the opening of the gap at the nozzle tip can be adjusted. Therefore, the liquid ejection speed and the film thickness can be set to appropriate values. Further, the wavy profile can be adjusted by adjusting the temperature of the gap opening at the tip of the nozzle into a plurality of parts, each of which can independently heat and cool. Further, by the same operation, the ejection speed of the liquid from the nozzle gap at the tip of each divided portion can be adjusted by adjusting the opening of the nozzle tip gap according to the operating condition of the coater. Furthermore, even if the nozzle tip profile is wavy due to changes in ambient temperature and liquid temperature, it can be easily dealt with.

[0009]

【Example】

The present invention will be described below with reference to the embodiments of the drawings. FIGS. 1 to 3 show the embodiments of the present invention. First, FIG. 1 shows an example in which a coater nozzle blowing gap adjusting device is applied to the nozzle of FIG. In the figure, 2 is a nozzle, 2c is a nozzle bottom, and 6 is a gap. When the jacket 11 is attached to the nozzle bottom 2c and hot water and cold water are passed through, the opening G of the gap 6 at the nozzle tip 2b changes. Therefore, the flow velocity v of the liquid blown through the gap 6 through the in-nozzle passage 2a changes, so that the flow velocity v _i can match the peripheral velocity V of the backing roll 1. The means for heating and cooling is not limited to hot and cold water, but may be hot or cold air, an electric heater, a cooling fan, or another heat source such as laser or infrared heating.

Next, FIGS. 2 and 3 show a second embodiment, in which a coater nozzle blowing profile adjusting device is applied to the nozzle of FIG. In the case of FIGS. 2 and 3, the jacket 11 attached to the nozzle bottom portion 2c is divided into a plurality of pieces in the width direction, and n jackets 11a, 11b-11n are arranged with a partition wall or space for blocking heat. ing. Each jacket 11a, 11b-11n is provided with a heating and cooling device (not shown). The opening of the gap 6 of the nozzle tip 2b corresponding to the plurality of jackets 11 (11a to 11n) is adjusted independently of the other nozzle tips 2b.

[0011]

[Effect of the device]

 As described in detail above, according to the present invention, the opening speed of the nozzle tip gap can be adjusted by the coater nozzle blowout gap adjusting device to change the outflow speed of the liquid from the gap as the operating speed of the coater changes. Therefore, it is possible to support a wide range of coater operating conditions. In addition, the gap opening can be returned to an appropriate value in response to a change in the nozzle tip gap due to changes in the ambient velocity and the liquid temperature, and a good coated surface can be obtained. Further, according to the present invention, the waviness of the profile in the width direction of the nozzle tip can be corrected, so that the unevenness in the width direction of the liquid sprayed on the web traveling along the backing roll can be eliminated and the web can be removed. The coat layer (film thickness t) to be coated can be freely adjusted to a value suitable for the speed V. In addition, the profile in the width direction of the nozzle tip can be dealt with by waviness due to changes in ambient temperature and liquid temperature, and a good coated surface can be obtained.

[Brief description of drawings]

FIG. 1 is a side sectional view of an outlet gap adjusting coater nozzle showing a first embodiment of the present invention.

FIG. 2 is a side sectional view of an outlet profile adjusting coater nozzle showing a second embodiment of the present invention.

FIG. 3 is a front sectional view of FIG.

FIG. 4 is a side sectional view of a conventional coater nozzle.

FIG. 5 is a side view of a conventional coater for applying a liquid to a web.

FIG. 6 is a side sectional view of a coater nozzle different from the conventional coater nozzle shown in FIG.

FIG. 7 is a front sectional view of FIG.

[Explanation of symbols]

 1 Backing Roll 2 Nozzle 2a Nozzle Passage 2b Nozzle Tip 2c Nozzle Bottom 4 Lip 6 Gap 7 Pipe 11, 11a-11n Jacket G Opening

Claims (2)

[Scope of utility model registration request] 1. In a nozzle of various coaters for applying a liquid to a belt-shaped web of paper, film, metal, cloth or the like, the opening of the tip gap of the nozzle is increased by heating and cooling the outer circumference of the nozzle. A coater nozzle blowout gap adjusting device characterized by adjusting. 2. In a nozzle of various coaters for applying a liquid to a belt-shaped web such as paper, film, metal, cloth, etc., it is divided into a plurality of parts on the outer periphery of the back surface of the nozzle or one part thereof along the entire length in the width direction. Is provided, and the opening of the tip gap of the nozzle is adjusted for each part by individually heating and cooling the part, and the profile in the width direction of the nozzle tip is adjusted. Coater nozzle blowout gap adjusting device.