JP2001310146A - Df(direct fountain) coater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel DF coater adapted so as to effectively inhibit an entrained air stream from being formed on the surface of a base paper. SOLUTION: The DF coater performs coating by allowing a coating film L to continuously flow down onto the upper surface of a belt-like base paper B running substantially horizontally between a pair of guide rollers 3 and 3. A suction mechanism for forcing the air on the side of the upper surface of the base paper B to permeate paper B and sucking up the air on the side of the lower surface is provided at the coating on position of the lower surface side of the base paper B. This constitution can effectively inhibit the entrained air stream from being formed on the surface of the base paper B and can therefore ensure stable high-quality coating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DF coater for continuously producing processed paper or the like in which a pressure-sensitive paint or the like is directly applied on a tape base paper.

[0002]

2. Description of the Related Art Conventionally, processed paper such as pressure-sensitive paper (registered trademark) and carbon paper has been manufactured by a so-called DF coater (Direct-Fountain-Coater) as shown in FIG.

[0003] As shown in the figure, this DF coater apparatus has a feeding roll 1 on which a band-shaped base paper B is wound.
A take-up roller 2 for taking up the base paper B fed from the feed roll 1; a pair of guide rollers 3, 3 for guiding the feed roll 1 and the take-up roller 2 substantially horizontally; , 3 and a fixing section 5 located downstream of the coating header 4. The coating header 4 substantially guides the space between the guide rollers 3. Base paper B flowing horizontally
A coating liquid such as a pressure-sensitive agent is caused to flow down from above the film to form a coating film L on the upper surface of the base paper B, and then the coating film L is applied by a fixing unit 5 such as a heater positioned downstream of the coating film L. The processed paper is continuously manufactured by continuously fixing the coating L on the upper surface of the base paper B.

In general, the conveying speed (feeding speed) of the base paper B is set to about 10 to increase the efficiency of producing processed paper.
Since the speed is as high as 00 m / min, an entrained airflow which flows downstream is generated on the surface of the base paper B along with the flow, and the coating film L is largely disturbed by this flow. Cannot be performed, and the quality of the processed paper may be reduced.

For this reason, conventionally, as shown in the figure, a plate-shaped metal (stainless steel or the like) blade 6 is located at an interval of about 1 mm upstream of the coating position P of the base paper B, and By shutting off the entrained air flow A generated on the upper surface in advance on the upstream side of the coating position P, adverse effects due to the entrained air flow A are prevented.

[0006]

By the way, even if the entrained airflow A is cut off by providing the blade 6 on the upstream side of the coating position P, the coating position P and the Since a certain distance is formed between the blades 6, as shown in FIG. 8, when the base paper B passes between the coating position P and the blade 6, the air around the base paper B is drawn into A new entrained air flow is generated, and the coating film L is also disturbed by the newly generated entrained air flow and a part of the entrained air flowing downstream through the gap between the blade 6 and the base paper B. There was a thing.

For this reason, the distance between the coating position P and the blade 6 is reduced as much as possible,
It is conceivable to suppress the adverse effect due to the entrained air flow by contacting the base paper B with the base paper B side to eliminate the gap. However, in the former method, the distance between the coating header 4 and the blade 6 is reduced due to the installation convenience. There is a limit in shrinking, and in the latter method, fine paper dust is generated due to high-speed rubbing between the blade 6 and the base paper B, and this is mixed into the coating film L to reduce the quality of the processed paper. There is a risk of lowering.

The present invention has been devised in order to effectively solve such a problem, and an object of the present invention is to effectively suppress the generation of an entrained air flow generated on the surface of a base paper. The present invention provides a new DF coater device capable of performing the above.

[0009]

According to the present invention, a coating film is continuously formed on the upper surface of a strip-shaped base paper flowing substantially horizontally between a pair of guide rollers. In the DF coater apparatus for performing coating by flowing down, a suction mechanism is provided on the lower surface side of the coating position of the base paper for allowing air on the upper surface side of the base paper to pass through the base paper and suck the air on the lower surface side. Things.

As described above, by providing the suction mechanism on the lower surface side of the coating position of the base paper, even if an entrained air flow is generated, the air on the upper surface of the base paper is forcibly passed through the base paper to be applied to the lower surface thereof. Since the entrained air flow on the upper surface of the base paper disappears due to the suction, the adverse effect of the entrained air flow is eliminated and stable and good coating can be performed.

As a specific configuration of the suction mechanism, as described in claim 2, a suction chamber in surface contact with the lower surface side of the base paper coating position upstream, and the inside of the suction chamber is set to a negative pressure. Exhaust pump, and
4. A suction chamber having a plurality of suction holes or slits for suction formed on a base paper contact surface of the suction chamber, or circulating in the feed direction while being in surface contact with the lower surface side of the base paper. Endless belt, and a suction chamber in the endless belt and located on the lower surface side of the coating position, and an exhaust pump for negative pressure in the suction chamber, and, from the surface to the endless belt By using a plurality of suction holes or suction slits communicating with the inside, air on the top side of the base paper can be effectively sucked, so that the generation of entrained air can be suppressed reliably. Can be.

Further, by forming these suction holes or slits obliquely downward on the upstream side of the base paper, the generation of the entrained airflow can be more effectively suppressed. .

Further, if a plate-shaped blade for shutting off the entrained air flow is further provided on the upstream side of the coating position of the base paper as in the prior art, the entrainment is more reliably performed. An adverse effect due to the airflow can be prevented.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a DF coater according to the present invention. In FIG. 1, B denotes a band-shaped base paper B fed from an upstream guide roller 3 in a substantially horizontal direction.
Reference numeral 4 denotes a coating head which continuously coats the coating film L by flowing down on the upper surface of the base paper B, and reference numeral 6 denotes a plate-shaped blade provided on the upstream side of the coating head 4.

Then, as shown in FIG.
In the coater apparatus, a suction mechanism 7 is provided on the lower surface of the base paper B, specifically, on the lower surface on the upstream side of the coating position P of the coating film L, and the air on the upper surface side of the base paper B, specifically, The air on the upper surface on the upstream side from the coating position P is made to permeate through the base paper B and is sucked on the lower surface.

That is, as shown in FIGS. 1 and 2, the suction mechanism 7 exhausts air to the side surface of a substantially rectangular internal hollow suction chamber 8 whose upper surface is in surface contact with the lower surface of the base paper B. It is provided with a duct 9 and an exhaust pump 9 in the exhaust duct 9 and a plurality of suction holes 11 formed in the upper surface of the suction chamber 8. The exhaust pump 10 is driven to release air in the suction chamber 8. By forcibly exhausting air to make the inside of the suction chamber 8 a negative pressure, the air on the side of the base paper B is sucked from the suction hole 11 and the base paper B is adsorbed on the upper surface, and the air on the upper surface of the base paper B is transmitted. The suction chamber 8 is forcibly sucked into the suction chamber 8.

Therefore, in the DF coater of the present invention, the air on the upper surface of the base paper B upstream of the coating position P is effectively sucked into the suction chamber 8 through the base paper B. Therefore, as shown in FIG. 3, a suction zone is always formed on the upstream side of the coating position P, and it is possible to reliably suppress the generation of the entrained airflow in the suction zone.

Accordingly, not only is the adverse effect of the entrained air flow eliminated, the coating quality is improved, but also the feed speed of the base paper B can be further increased, so that the production efficiency is improved and the production cost of the processed paper is improved. , Etc. can be achieved. Further, since the base paper B is always conveyed while being sucked to the suction chamber 8 side, the position of the base paper B, particularly its height, is always constant, and the vertical sway is suppressed. In addition, the coating accuracy can be made more reliable.

As a result, in the present invention, the blade 6 conventionally used can be omitted.
In order to more reliably suppress the entrained airflow upstream of
It is desirable to provide the blade 6 on the upstream side together with the suction mechanism 7.

The direction of the perforation of the suction hole 11 is not particularly limited as long as it communicates with the inside and outside of the suction chamber 8, but as shown in FIG. If it is formed obliquely downward, a suction flow is generated on the upper surface of the base paper B so as to be opposed to the flow direction of the base paper B. Therefore, even if a slight entrained air flow is generated, this is opposed to the flow direction. As a result, the air flow is canceled out by the suction flow generated and disappears, so that the generation of the entrained air flow can be suppressed more reliably.

The same operation can be achieved by employing a slit 12 extending in the width direction as shown in FIG. 4 instead of the suction hole 11 formed on the upper surface of the suction chamber 8.
The effect can be obtained.

Next, FIGS. 5 and 6 show the suction mechanism 7 described above.
13 shows another embodiment of the present invention.

First, the suction mechanism 7a shown in FIG.
And an endless belt 14 circulating in the feed direction while being in surface contact with the lower surface side of the base paper B between the rotating rollers 13, 13.
A suction chamber 15 having an open upper surface is provided on the lower surface side of the coating position P in the inside 4, and a plurality of suction holes 16 are formed in the endless belt 14 so as to communicate from the surface to the inside. As a result, similarly to the suction mechanism 7 shown in the above-described embodiment, the air on the side B on the base paper can be effectively sucked and the generation of the entrained air flow can be reliably suppressed, and the rotating rollers 13 and 13 are driven. Endless belt 1
4 is circulated in the feeding direction of the base paper B at the same speed as the feeding speed, so that the contact friction between the base paper B and the suction mechanism 7 is suppressed, so that more efficient and high quality coating is performed. Becomes possible.

That is, in the above-described suction mechanism 7, since the suction chamber 8 is fixed, the lower surface of the base paper B rubs against the upper surface of the suction chamber 8 to generate contact friction. It is conceivable that paper dust is generated by scraping, or the upper surface side of the suction chamber 8 is worn out due to long-term use. However, according to the suction mechanism 7a of the present embodiment, the base is slightly complicated. Since the frictional resistance with the lower surface side of the paper B is almost eliminated, the above-described inconvenience can be surely avoided.

Next, FIG. 6 shows that the endless belt 14 and the suction chamber 15 are further extended to the upstream side, the end of the endless belt 14 is extended to the upstream guide roller 3 side, and the guide roller 3 itself is connected. It is made porous and has a second suction chamber 16 provided therein.
As a result, the air on the base paper B is effectively suctioned and removed not only immediately near the coating position P but also from the guide roller 3 side to the coating position P. In addition to being able to more reliably suppress the occurrence, the blade 6 as described above is almost unnecessary, and this can be omitted as it is.

[0027]

In summary, according to the present invention, the generation of the entrained airflow on the upper surface of the base paper can be reliably suppressed. This not only eliminates the adverse effects of the entrained airflow and allows stable coating, but also allows the base paper feed speed to be further increased, thereby improving production efficiency and reducing the production cost of processed paper. Excellent effects, such as being able to achieve, can be exhibited.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a DF coater device according to the present invention.

FIG. 2 is a view taken along the line AA in FIG.

FIG. 3 is a plan view showing another embodiment of the suction mechanism shown in FIGS. 1 and 2;

FIG. 4 is a side view showing another embodiment of the suction mechanism constituting the DF coater device according to the present invention.

FIG. 5 is a side view showing another embodiment of the suction mechanism constituting the DF coater device according to the present invention.

FIG. 6 is a conceptual diagram showing a state of generation of an entrained airflow when the device of the present invention is used.

FIG. 7 is a schematic diagram showing a configuration of a conventional DF coater device.

FIG. 8 is a conceptual diagram showing a state of generation of an entrained airflow when a conventional DF coater device is used.

[Explanation of symbols]

 3 Guide Roller 4 Coating Head 6 Blade 7 Suction Mechanism 8 Suction Chamber 9 Exhaust Duct 10 Exhaust Pump 11 Suction Hole B Base Paper L Coating Film P Coating Position

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiroyuki Kono 60-10 Ekai Arai, Motomiya-cho, Adachi-gun, Fukushima Prefecture F-term in Ishikawashima Sangyo Kikai Co., Ltd. 4F041 AA12 AB01 CA04 CA25 4F042 AA22 DF17 DF30 4L055 CH10 EA23 FA14 FA23

Claims (5)

[Claims] 1. A DF coater apparatus for continuously coating and coating a coating film on an upper surface of a strip-shaped base paper flowing substantially horizontally between a pair of guide rollers. A DF coater device comprising a suction mechanism for allowing air on the upper side of the base paper to pass through the base paper and suck the air on the lower side. 2. The suction mechanism according to claim 1, wherein the suction mechanism includes a suction chamber in surface contact with the lower surface of the base paper at a coating position upstream thereof, and an exhaust pump for reducing the pressure in the suction chamber to a negative pressure. The DF coater device according to claim 1, wherein a plurality of suction holes or slits for suction are formed in the paper contact surface. 3. The endless belt circulating in the feed direction while being in surface contact with the lower side of the base paper, and a suction chamber located in the endless belt and on the lower side of the coating position. A plurality of suction holes or suction slits communicating from the surface to the inside of the endless belt are formed in the endless belt. Item 2. The DF coater device according to Item 1. 4. The DF coater device according to claim 2, wherein the suction hole or the slit is formed so as to be obliquely downward toward the upstream side of the base paper. 5. The DF according to claim 1, further comprising a plate-shaped blade for shutting off an entrained air flow, on the upstream side of the coating position of the base paper.
Coater equipment.