JP4427863B2 - DF coater device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a DF coater device for continuously producing processed paper or the like obtained by directly applying a pressure-sensitive paint or the like on a tape-like base paper.
[0002]
[Prior art]
Conventionally, processed paper such as pressure-sensitive paper and carbon paper is manufactured by a so-called DF coater (Direct-Fountain-Coater) apparatus as shown in FIG.
[0003]
As shown in the figure, the DF coater includes a feeding roll 1 around which a strip-shaped base paper B is wound, a winding roller 2 for winding up the base paper B fed from the feeding roll 1, and the feeding roll 1 and winding. A pair of guide rollers 3 and 3 for guiding the gap between the take-up rollers 2 substantially horizontally, a coating header 4 positioned above the guide rollers 3 and 3, and a fixing unit 5 positioned on the downstream side of the coating header 4 The coating header 4 causes the coating liquid such as a pressure-sensitive agent to flow down in the form of a film from above the base paper B that flows substantially horizontally between the guide rollers 3 and 3 by the coating header 4. After the coating film L is applied to the upper surface of the base paper B, the coated paper L is continuously fixed on the upper surface of the base paper B by the fixing unit 5 such as a heater located on the downstream side of the base paper B. What was manufactured continuously A.
[0004]
In general, the conveyance speed (feeding speed) of the base paper B is about 1000 m / min in order to increase the manufacturing efficiency of the processed paper. The entrained air flow that flows toward the surface is generated, and thereby the coating film L is greatly disturbed, and satisfactory coating cannot be performed, and the quality of the processed paper may be deteriorated.
[0005]
Therefore, conventionally, as shown in the drawing, a plate-like metal (stainless steel, etc.) blade 6 is positioned at an interval of about 1 mm upstream of the base paper B coating position P, and is generated on the upper surface of the base paper B. The accompanying air flow A is blocked in advance on the upstream side of the coating position P to prevent adverse effects of the accompanying air flow A.
[0006]
[Problems to be solved by the invention]
By the way, even when the blade 6 is provided on the upstream side of the coating position P to block the entrained air flow A, there is a certain distance between the coating position P and the blade 6. As shown in FIG. 8, when the base paper B passes between the coating position P and the blade 6, the surrounding air is entrained and a new entrained air flow is generated on the surface. Also, the coating film L may be disturbed by this newly generated accompanying air flow and a part of the accompanying air flowing downstream through the gap between the blade 6 and the base paper B.
[0007]
Therefore, it is considered that the distance between the coating position P and the blade 6 is made as close as possible, or the blade 6 is brought into contact with the base paper B side to eliminate the gap, thereby suppressing the adverse effect due to the accompanying air flow. In the former method, there is a limit to shortening the distance due to the installation convenience of the coating header 4 and the blade 6, and in the latter method, the blade 6 and the base paper B are rubbed at a high speed so that the distance is fine. There is a possibility that paper powder is generated and mixed into the coating film L, thereby lowering the quality of the processed paper.
[0008]
Therefore, the present invention has been devised in order to effectively solve such problems, and the purpose thereof is a novel that can effectively suppress the generation of entrained airflow generated on the surface of the base paper. A DF coater device is provided.
[0009]
[Means for Solving the Problems]
The present invention in order to solve the above described problems is the DF coater apparatus for coating flows down continuously coated film in a band of the base paper top flows substantially horizontally between a pair of guide rollers, of the base paper A suction mechanism is provided on the lower surface side of the coating position to allow the air on the upper surface side of the base paper to pass through the base paper and to be sucked into the lower surface side.
[0010]
By providing a suction mechanism on the lower surface side of the base paper coating position in this way, even if an accompanying air flow occurs, the air on the upper surface of the base paper is forcibly passed through the base paper and sucked into the lower surface. Since the entrained air flow on the upper surface of the base paper disappears, there is no adverse effect of the entrained air flow, and stable and satisfactory coating can be performed.
[0011]
As a specific configuration of this suction mechanism, as shown in claim 1 , a suction chamber that is in surface contact with the lower surface side upstream of the coating position of the base paper, and an exhaust pump that creates a negative pressure in the suction chamber And a plurality of suction holes or suction slits are formed on the base paper contact surface of the suction chamber, and as shown in claim 2 , the base paper is in surface contact with the lower surface side of the base paper. The endless belt that circulates in the feeding direction, a suction chamber that is located in the endless belt and on the lower surface side of the coating position, and an exhaust pump that creates a negative pressure in the suction chamber, and By using the endless belt that has a plurality of suction holes or suction slits communicating from the surface to the inside, the air on the upper side of the base paper is effectively sucked in. Since it is possible to suppress the occurrence of reliably entrained air.
[0012]
Further, these suction holes or slits, it is possible to suppress the occurrence of more effectively entrained air flow is formed toward the upstream side obliquely downward of the base paper.
[0013]
Further, as shown in claim 3 , if a plate-like blade for blocking the entrained air flow is further provided on the upstream side of the base paper coating position as in the prior art, it is more reliably caused by the entrained air flow. Adverse effects can be prevented.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, a preferred embodiment for carrying out the present invention will be described with reference to the accompanying drawings.
[0015]
FIG. 1 shows an embodiment of a DF coater according to the present invention. In FIG. 1, B is a belt-like base paper B fed from the upstream guide roller 3 in a substantially horizontal direction, and 4 is this base paper B. A coating head 6 for continuously coating the upper surface of the coating film L by flowing down the coating film L is a plate-like blade provided on the upstream side of the coating head 4.
[0016]
As shown in the drawing, in the DF coater according to the present invention, the suction mechanism 7 is provided on the lower surface of the base paper B, specifically, the lower surface upstream of the coating position P of the coating film L. The air on the upper surface side of the base paper B, specifically, the air on the upper surface upstream from the coating position P is permeated through the base paper B and sucked to the lower surface side.
[0017]
That is, as shown in FIGS. 1 and 2, the suction mechanism 7 has an exhaust duct 9 on the side surface of an internal hollow suction chamber 8 whose upper surface has a substantially rectangular shape so as to come into surface contact with the lower surface side of the base paper B. In addition, the exhaust duct 9 is provided with an exhaust pump 10 and a plurality of suction holes 11 are formed on the upper surface of the suction chamber 8. The exhaust pump 10 is driven to force the air in the suction chamber 8. By evacuating and making the inside of the suction chamber 8 have a negative pressure, the air on the base paper B side 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 allowed to pass through. The suction chamber 8 is forcibly sucked.
[0018]
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 effectively permeates the base paper B and is sucked into the suction chamber 8. Therefore, as shown in FIG. 3, a suction zone is always formed on the upstream side of the coating position P, and generation of an entrained air flow in the suction zone can be reliably suppressed.
[0019]
Therefore, not only is the adverse effect of the entrained air flow eliminated, the coating quality is improved, but 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 reduced. Etc. can also be achieved. In addition, since the base paper B is always conveyed while being sucked to the suction chamber 8 side, the position of the base paper B, in particular, the height thereof is always constant, so that up / down shaking and the like can be suppressed. The coating accuracy can be made more reliable.
[0020]
As a result, the blade 6 conventionally used in the present invention can be omitted. In order to more reliably suppress the entrained air flow on the upstream side of the coating position P, the blade 6 is used in combination with the suction mechanism 7. It is desirable to provide the blade 6 on the upstream side.
[0021]
Also, the suction holes 11 state, and are not to communicate the inside and outside of the suction chamber 8, as shown in FIG. 1, in Rukoto be formed toward the upstream side obliquely downward of the base paper B, the upper surface of the base paper B Therefore, even if a slight entrained air flow is generated, it is canceled by the suction flow generated so as to face the flow direction. Therefore, it is possible to more reliably suppress the accompanying air flow.
[0022]
Further, the same action and effect can be obtained even if a slit 12 extending in the width direction is employed as shown in FIG. 4 in place of the suction hole 11 formed on the upper surface of the suction chamber 8.
[0023]
Next, FIG.5 and FIG.6 shows other embodiment of the suction mechanism 7 mentioned above.
[0024]
First, the suction mechanism 7 a shown in FIG. 5 is provided with a pair of rotating rollers 13, 13 in the flow direction on the lower surface side of the base paper B, and in surface contact with the lower surface side of the base paper B between the rotating rollers 13, 13. The endless belt 14 that circulates in the feeding direction is bridged, and a suction chamber 15 having an upper surface opened on the lower surface side of the coating position P in the endless belt 14 is provided. Further, the endless belt 14 communicates from the surface to the inside. A plurality of suction holes 16 are formed. As a result, in the same manner as the suction mechanism 7 shown in the above embodiment, the air on the B surface side of the base paper can be effectively sucked to reliably suppress the generation of the entrained air flow, and the rotation rollers 13 and 13 are driven. Since the endless belt 14 is circulated in the feed direction of the base paper B at the same speed as the feed speed, the contact friction between the base paper B and the suction mechanism 7 is suppressed, so that more efficient and high-quality coating can be achieved. Work can be performed.
[0025]
That is, in the suction mechanism 7 described above, since the suction chamber 8 is fixed, the lower surface side of the base paper B is rubbed against the upper surface side of the suction chamber 8 and contact friction is generated. Therefore, the lower surface side of the base paper B is scraped off. Although it is considered that paper dust is generated or the upper surface side of the suction chamber 8 is worn due to long-term use, according to the suction mechanism 7a of this embodiment, the structure of the base paper B is slightly complicated. Since the frictional resistance with the lower surface side is almost eliminated, the above inconvenience can be surely avoided.
[0026]
Next, in FIG. 6, the endless belt 14 and the suction chamber 15 are further extended to the upstream side, the end of the endless belt 14 is bridged to the upstream guide roller 3 side, and the guide roller 3 itself is made porous. The second suction chamber 16 is provided in the inside. As a result, the air on the base paper B is effectively sucked and removed not only in the immediate vicinity of the coating position P but also from the guide roller 3 side to the coating position P. The generation can be suppressed more reliably, and the blade 6 as described above becomes almost unnecessary, and can be omitted as it is.
[0027]
【The invention's effect】
In short, according to the present invention, the generation of the entrained air flow on the upper surface of the base paper can be reliably suppressed. As a result, not only can the negative effects of the entrained air flow be eliminated and stable coating can be performed, but also the base paper feed speed can be further increased, thus improving production efficiency and reducing the production cost of processed paper. It is possible to achieve excellent effects such as being able to achieve this.
[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 line AA in FIG.
FIG. 3 is a plan view showing another embodiment of the suction mechanism shown in FIGS. 1 and 2. FIG.
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 in which an entrained air flow is generated when the apparatus 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 in which an entrained air flow is generated 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

Claims (3)

In the DF coater device, which coats the coating film by continuously flowing down on the upper surface of the strip-shaped base paper flowing substantially horizontally between the pair of guide rollers, the upper surface side of the base paper on the lower surface side of the coating position of the base paper A suction mechanism for causing the base paper to permeate through the base paper and sucking it into the lower surface side . The suction mechanism has a suction chamber in surface contact with the lower surface side upstream of the coating position of the base paper, and the inside of the suction chamber. And a plurality of suction holes or slits for suction are formed on the base paper contact surface of the suction chamber, and the suction holes or slits are obliquely upstream of the base paper. A DF coater device that is perforated downward . In the DF coater device, which coats the coating film by continuously flowing down on the upper surface of the strip-shaped base paper flowing substantially horizontally between the pair of guide rollers, the upper surface side of the base paper on the lower surface side of the coating position of the base paper A suction mechanism for causing the base paper to permeate through the base paper and sucking it into the lower surface, the suction mechanism circulating in the feed direction while being in surface contact with the lower surface of the base paper, and the endless belt A plurality of suction pipes comprising a suction chamber located on the lower surface side of the coating position in the belt and an exhaust pump for making the inside of the suction chamber negative pressure, and communicating with the endless belt from the surface to the inside. A DF coater device, wherein a hole or a slit for suction is formed, and the suction hole or slit is perforated toward an obliquely downward upstream side of the base paper . The DF coater device according to claim 1 or 2 , further comprising a plate-like blade for blocking an entrained air flow on the upstream side of the base paper coating position .

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