JPS622191Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a roll that rotates in direct or indirect contact with the corrugated sheet in the feeding and passing section of the corrugated sheet, and there are the following rolls. .

For example, a rider roll installed in the gluing section of a corrugating machine as a presser to prevent single-tiered sheets from floating up, a weight roll installed in the heating section, or a rotary cutter section. There are feed rolls for feeding provided in front, feed rolls for feeding of corrugated sheet processing machines such as printing machines and folder gluers, and press rolls.

Originally, so-called corrugated sheets such as single-corrugated sheets and double-sided corrugated sheets, which have a corrugated structure, tend to collapse or flow due to clamping pressure, which can easily damage the corrugated molding. This is especially noticeable as the various liner papers used are thinner.

Therefore, in the manufacturing and processing process of corrugated cardboard sheets, which have many various rolls that cause corrugated corrugations, how can we prevent the loss of thickness due to corrugated corrugations, etc., and prevent the loss of strength? Maintaining the sheet thickness, which is the lifeblood of the industry, has long been a major issue in the industry.

The gluing section of a corrugating machine, which is a corrugating sheet manufacturing machine, has a glue roll that transfers glue onto the top of the corrugation of the web-like single-column sheet sent from the previous process. To prevent floating, there is a heavy steel rider roll above the glue roll that holds the single-tier sheet in place.

It is sufficient to gently touch the corrugated top of a single-column sheet with a glue roll, but in order to prevent poor adhesion of the corrugated sheet due to poor adhesion of the glue, it is necessary to use a rider roll to ensure that the glue is transferred to the corrugated top. By supporting the shaft with a lever mechanism, the above-mentioned single-tiered sheet is slightly pressed down.

The rider roll mentioned above comes into contact with the liner paper side of the single-tiered sheet, but the liner paper tends to be lower at the bottom than at the top, and there is also the phenomenon of high-low caused by uncertain tier forming. The liner paper may become uneven even when
For safety reasons, the position of the rider roll is to be adjusted closer to the glue roll.

A stopper is provided on the lever mechanism to prevent the heavy rider roll from coming closer to the glue roll than the adjusted position. The lever mechanism allows for upward movement, but since the rider roll is heavy, it does not move upward easily.

Therefore, the single-tiered sheet passing through will be squeezed by the glue roll and the rider roll,
Crashing occurs.

Furthermore, in the case of this conventional steel rider roll, since the single-tiered sheet is pressed down a little, the top of the single-tiered sheet strongly hits the glue roll, resulting in more glue than necessary being transferred.

As a result, the unit of glue, that is, the amount of glue adhered per unit area of the corrugated board sheet increases, which not only becomes uneconomical, but also causes the single-corrugated sheet to absorb additional moisture.

If a large amount of water is absorbed, the following problems and waste will occur.

First of all, since the corrugated cardboard sheet becomes soft, corrugation is more likely to occur even in the processes after the gluing part, and the strength is significantly reduced.

Second, since the heating part needs to absorb more heat than usual, the loss of thermal energy increases. In addition, as a means of applying additional heat, the machine speed is reduced in order to increase the residence time in the heating part even a little, resulting in a decrease in production.

Furthermore, in order to ensure that the corrugated sheet comes into contact with the heating plate of the heating part as fully as possible to improve heat absorption and conduction, the pressure applied to the corrugated sheet from above must be increased. Even points can cause the step to collapse.

Thirdly, the corrugated cardboard sheets tend to warp, which not only causes machine troubles but also generates defective sheets.

Naturally, it is necessary to adjust the clearance between the rider roll and the glue roll depending on the liner paper used, but this adjustment is very time-consuming and requires a high degree of skill.

Furthermore, the type of stage (A flute, B flute, etc.),
In other words, when corrugated sheets with different corrugation heights are passed between the same pair of rider rolls and glue rolls, it is necessary to make subtle adjustments to the clearance between the rider rolls and glue rolls. Therefore, in the conventional case, a separate pair of rider roll and glue roll is required for each stage type to be passed. Although some consideration has been given to the width of the traveling single-tiered sheet and the pressure of the rider roll using the device disclosed in Japanese Utility Model Publication No. 49-36617, the above-mentioned problem has not yet been solved. Needless to say.

Next, in the heating part of the corrugating machine, many steel weight rolls are installed through cotton belts so that the corrugated sheet is in sufficient contact with the heating plate to improve heat absorption and heat conduction. attitude.

The device of Utility Model Registration No. 1255857 by the present inventor, that is, the device in which the shaft of the weight roll is supported by a lever mechanism or a wedge-shaped tapered surface part, controls the amount of pressure applied to the corrugated board sheet by the weight roll. Some consideration has been given to making adjustments.

In addition, if the pressing force applied to the corrugated sheet by the weight roll is increased, the adhesion of the corrugated sheet will be better and the machine speed can be increased, but since the weight roll is in line contact with the cotton belt in the width direction, Even though the belt is used, the pressure applied per unit area of the corrugated board sheet is quite large, causing the corrugated board to collapse.

In addition, since lacing is used at the joint part of the cotton belt, when this part passes,
The weight roll dances a lot, which places a large amount of extra force on the corrugated sheet, which also causes corrugated collapse.

Incidentally, when impurities or the like adheres to the cotton belt and the protruding portion due to the adhesion passes through the belt, collapse of the step similarly occurs.

Furthermore, there is a drawback that the clearance between the weight roll and the hot platen must be adjusted each time depending on the corrugated type, material, etc. of the corrugated cardboard sheet being passed through.

Next, in front of the rotary cutter section of the corrugating machine, there are a pair of steel feed rolls for feeding corrugated sheets.

Because it is necessary to transport only the web-like corrugated paper or liner paper sent from the previous process to the rotary cutter without any stagnation, the feed roll is operated at a speed slightly higher than the speed of the corrugated cardboard sheets being fed. The corrugated paperboard is rotated by a feed roll, and the corrugated cardboard sheet is fed to the rotary cutter with constant tension.

Therefore, in normal cases, the feed roll conveys the corrugated cardboard sheet with a slight slippage.

In conventional steel feed rolls, the contact between the corrugated sheet and the feed roll is close to line contact in the width direction on both sides of the corrugated sheet.

Therefore, in order to obtain sufficient contact pressure to convey only the corrugated sheet or liner paper under tension, the clamping pressure by the pair of feed rolls must be strong, and the pressure per unit area applied to the corrugated sheet becomes large. This causes corrugated cardboard sheets to collapse.

Paired steel feed rolls are also used in printing machines used to process corrugated cardboard sheets, as well as paper feed units for folder gluers, rotary die cutters, etc., and in these cases as well, the desired accuracy can be achieved. As a result, the corrugated cardboard sheet is fed to the processing rolls etc. under strong clamping pressure by the pair of feed rolls, resulting in collapsing of corrugations as described above.

Further, step crushing also occurs in the auxiliary feed roll provided in the processing machine.

The purpose of this invention is to use gas such as air as a pressure medium to provide cushioning properties and elasticity to the outer periphery of the roll, allowing the roll to absorb excess force, and to make the corrugated cardboard sheet rotates in contact with as wide an area as possible, maintains the minimum total pressure that must be applied to the corrugated sheet, reduces the pressure applied per unit area of the corrugated sheet, and further reduces the amount of pressure applied to the surface of the corrugated sheet. By being able to cover unevenness, it prevents thickness loss due to corrugated cardboard sheets from collapsing, prevents strength deterioration, prevents defective corrugated sheets from warping, etc., and prevents machine trouble. Transport the corrugated sheet or liner paper securely to prevent this from occurring.
Furthermore, it is an object of the present invention to provide a roll aimed at improving productivity, and to achieve these purposes without adjusting the clearance between rolls, from a single sheet of paper to various stages.

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

FIG. 1 shows a gluing part B and a heating part C of a corrugating machine using the roll A of the present invention shown in FIGS. 3 to 5 as a rider roll or a weight roll.

This gluing section B includes a glue pan 1, a glue roll 2 whose lower circumferential surface is immersed in the glue in the glue pan 1, and a glue roll 2 that is provided to adjust the amount of glue attached to the glue roll 2 to an appropriate amount. It is composed of a doctor roll 3 and a rider roll 4 which sandwiches a single-tiered sheet S traveling between the glue roll 2 and the glue roll 2.

In addition, the heating part C includes a weight roll 5 and a heating plate 6 for drying and adhering the corrugated cardboard sheet D in which the single-column sheet S and the liner paper S' are laminated together.
, a weight roll 5 as a presser, and a cotton belt 7 that runs in contact with the corrugated cardboard sheet D between these.

Fig. 2 shows a corrugating process in which a web-shaped corrugated cardboard sheet D flowing through a slitter, scorer section E, etc., which is a pre-process, is conveyed to a rotary cutter section F by a pair of feed rolls 8 and 9. An example is shown in which the roll A of the present invention is used as the feed roll 8 during a partial process of the machine.

In Figure 2, the roll A of the present invention is used only for the roll 8 on one side of the pair of feed rolls 8 and 9, but if the roll A of the present invention is used for both sides, or the roll of the present invention is used only for the roll 9 side. A may also be used.

Moreover, a plate-shaped guide (not shown) for guiding the corrugated cardboard sheet D may be used instead of the roll 9.

The rotational speed of the feed roll 8 is set to be slightly faster than the running speed of the corrugated paperboard sheet D so that the corrugated paperboard sheet D being fed can be conveyed with some tension.

Next, an embodiment of the roll A will be described based on FIGS. 3 to 5.

The roll A shown in FIG.
, a tube 12 wound spirally around the main body 11, and an injection passage 13 for gas such as air provided at the axis of the roll main body 11 so as to communicate with the tube 12.

The tube 12 is made of non-air permeable, flexible natural or synthetic rubber or synthetic resin.

The tube 12 and the passage 13 may be communicated with each other by, for example, fitting the end of the tube 12 into the mouth of the passage 13 and fixing the tube 12 with an adhesive or the like. This fixation also serves to support the tube 12 on the main body 11 of the roll.

Further, the tube 12 and the passage 13 may be connected using another joint member.

In addition, as another method of fixing the tube 12 to the roll body 11, there is a method of providing another fixing member on the roll body 11, a method of using an adhesive, an adhesive tape, or the like.

Further, the gas to be supplied to the passage 13 may be injected from a hose (not shown) connected to the passage 13 via a rotary joint.

Furthermore, the tube 12 may be provided with an injection port with a stopper, and the gas may be injected through the above-mentioned injection port. In that case, the passage 13, rotary joint, etc. become unnecessary.

Furthermore, the method of supporting the tube 12 with respect to the roll body 11 is, for example, as shown in the figure.
By providing a spiral groove 15 into which a part of the circumferential surface of the tube 12 fits, the tube 12 into which gas is injected can be stably supported.

In this embodiment, the tube 12 is wound in opposite thread directions from the center of the roll body 11 toward both ends to prevent the running sheet from escaping laterally.

Next, the roll A shown in FIG. It consists of a spiral groove into which the surface fits.

The distance between adjacent tubes 12 in the roll A shown in FIGS. 3 and 4 is set within a range that does not interfere with the normal feeding and passage of the corrugated paperboard sheet.

In addition, in the case of the roll A shown in Figs. 3 and 4, when replacing the tube 12 with a new tube due to damage etc., the new tube can be wound and installed without removing the roll body 11 from the machine. .

Next, the roll A shown in FIG. 5 consists of a roll body 11, an elastic cylinder 16 fitted into the roll body 11, and both ends of the cylinder 16 fixed to the roll body 11 to keep the space airtight. A tightening band 17 as a fixing member for fixing the roll body 11 and the cylinder body 16.
A cord-like member 18 is wound spirally around the outer periphery of the cylindrical body 16 to form a spiral airtight space between the cylindrical body 16 and a cord-like member 18 provided in the roll body 11 so as to communicate with the space. It is constituted by an injection passage 13 for gas such as air.

Note that an adhesive or an adhesive tape may be used as the fixing member.

Furthermore, a hose and passage 1 for injecting gas
3, an appropriate joint member such as a rotary joint may be used as in the case of the above embodiment.

Moreover, by providing a gas injection part similar to the above in the cylinder body 16 and injecting gas from the above-mentioned injection port, the passage 13, the rotary joint, and the hose become unnecessary.

As shown in FIG. 3, when the protrusions formed on the roll body 11 are spiral in alternate directions, it is possible to prevent the running sheet from shifting and meandering.

On the other hand, when the protrusions are spiral in one direction as shown in Figures 4 and 5, the sheet can be moved while pulling one side edge of the sheet to the ruler plate (guide) on one side of the conveyance path. The position can be adjusted.

In addition, the thickness or material of the tube or cylinder should be such that even after the injection needle, which is an attachment for sealing gas, is removed from the tube, the airtightness of that part of the tube and cylinder is maintained. If selected appropriately, the gas injection part does not necessarily have to be an injection port with a stopper.

The material of the tube 12 or cylindrical body 16 may be natural rubber, synthetic rubber such as ethylene vinyl acetate (EVA), butadiene rubber (BR), styrene butadiene rubber (SBR), acryl nitributadiene rubber (NBR), urethane, or polyethylene. It is preferable to use a synthetic resin such as , which has ease of molding, processability, elasticity, heat resistance, ease of removing foreign substances, and abrasion resistance.

Note that natural rubber generally has lower hardness than synthetic rubber, so it has more elasticity, but synthetic rubber is better in terms of wear resistance, heat resistance, etc.

Further, the surface of the roll A may be lined to provide wear resistance, release properties, and strength.

The roll according to this invention has the above configuration, and the operation when this roll A is used in the gluing section B of FIG. 1 will be explained.

When the single-column sheet S passes between the rider roll 4 and the glue roll 2 of the gluing section, the glue is transferred to the corrugated top of the single-column sheet S by the glue roll 2.

Liner paper fed towards the single-tiered sheet S above
S' is pasted through the transferred glue.

At this time, by using the roll A according to the present invention as the rider roll 4, the pressure of the gas sealed in the tube 12 and cylindrical body 16 of the roll A can be appropriately selected to utilize the flow of the gas. If the roll A is given cushioning properties and elasticity, the roll A will come into surface contact with the single-column sheet S, and since it has a corrugated structure, the roll A of the single-column sheet S will inevitably occur. This eliminates the problem of unevenness on the contacting liner surface side.

Further, changes in the thickness of the single-tiered sheet S caused by some shock or the material used can be absorbed by the flow of gas within the tube.

Unlike steel rider rolls supported by conventional lever mechanisms, etc., where any changes or shocks directly affect the single-tiered sheet S, in the case of the roll A according to the present invention,
In addition to preventing the single-tiered sheet S from lifting up, which can cause poor adhesion, no matter what the single-tiered sheet S is,
The single-column sheet S should be kept in soft contact with the glue roll 2 in order to avoid strong contact with the glue roll 2 and cause collapsing, and so that the single-column sheet S can transfer an appropriate amount of glue from the glue roll 2. obtain.

Therefore, it is extremely effective in preventing the occurrence of defective sheets such as crumpled sheets, poorly bonded sheets, and curled sheets.

Further, the sheet S can be passed normally between the rider roll 4 and the glue roll 2 without requiring severe clearance adjustment between the rider roll 4 and the glue roll 2 due to changes in the material of the single-tiered sheet S. can.

Further, if it is necessary to adjust the clamping pressure, the gas pressure can be determined by the meter, so the adjustment can be easily carried out.

Next, the operation of the roll A in the heating part C in FIG. 1 will be described.

Conventionally, there has been a considerable amount of corrugated cardboard sheet collapse during this process.

Since this step is a dry bonding step, the speed of the machine will also be affected by how much heat can be applied to the corrugated sheets passing through this step.

However, if the effect of the weight roll is increased in order to speed up the process, this will result in the corrugated cardboard sheet being crushed.

In particular, in the case of conventional steel weight rolls, this is a big problem because the widthwise direction is close to line contact.

In this process as well, tube 1 of roll A
2. If the pressure of the gas sealed in the cylinder 16 is appropriately selected to impart cushioning properties and elasticity to the roll A,
Even if the pressure applied to the corrugated sheet by one weight roll is the same as before, roll A
Since it comes into surface contact with the corrugated paperboard sheet D via the cotton belt 7, the pressure applied per unit area of the corrugated paperboard sheet D is much smaller than that of conventional steel weight rolls.

Therefore, compared to the conventional method, roll A can apply more pressure to the cardboard sheet without causing the corrugations to collapse, which improves the heat transfer to the cardboard sheet D and leads to an increase in the machine speed, i.e., an increase in production volume.

In addition, the bumps on the cotton belt due to lacing parts and impurities are absorbed by the cushioning and elastic roll A, and there is no need to adjust the weight rolls by changing the material of the corrugated sheet.

Next, the effect when the roll A is used as the pair of feed rolls in front of the rotary cutter section F will be explained.

Since it is necessary to convey the corrugated cardboard sheet D to the rotary cutter section F without causing the corrugated sheet to be delayed in the previous process, the pair of feed rolls will be in a state where the corrugated cardboard sheet D is sandwiched with a considerably strong force.

In the case of conventional feed rolls, both the upper and lower pair of rolls are made of steel, so the corrugated sheet and feed roll are in line contact at the top and bottom of the corrugated sheet, so the unit that hangs over the top and bottom of the corrugated sheet The force per area is considerable.

Therefore, similarly to the explanation when the roll A of the present invention is used as the weight roll 5, if the roll A is used as one roll 8 of the pair of feed rolls, the corrugated cardboard sheet D and the roll A will come into surface contact. As a result, corrugated cardboard sheet misalignment at the feed roll section is extremely reduced.

In the embodiment shown in FIG. 2, only the upper side of the pair of upper and lower feed rolls is connected to roll A of the present invention.
However, on the contrary, the same or better effect can be obtained by using this roll A only on one side of the lower side or on both the upper and lower sides.

The roll of the present invention is not limited to the embodiments described above, but is a roll that uses gas to provide cushioning properties and elasticity, and is suitable for corrugated sheet processing machines such as printing machines and folder gluers. It generally includes rolls that are used in direct or indirect contact with corrugated paperboard sheets, such as feed rolls provided therein.

As mentioned above, by using the roll according to this invention, many of the problems conventionally encountered with various steel rolls can be solved.

In addition, hollow elastic protrusions filled with pressure medium,
Since the protrusions are provided in a spiral shape, when the protrusions are brought into contact with the corrugated cardboard sheet, the protrusions deform and form surface contact, increasing the contact area.

As a result, there is no slippage on the smooth surface of the corrugated sheet, and the sheet can be pulled or pushed to one side extremely well without degrading the strength of the corrugated sheet due to corrugation, etc.

Further, since the contact portions of the protrusions with the sheet are scattered in the width direction of the roll, frictional resistance is reduced, and the roll can be rotated smoothly or with a small amount of power.

Furthermore, since the ridges are formed by the tubes wound around the outer periphery of the roll body, even if the tubes are damaged, they can be replaced without having to remove the roll body from the device each time.

[Brief explanation of the drawing]

Figure 1 is a side view of the gluing part and heating part of a corrugating machine that uses the rolls of this invention as the rider roll and weight roll, and Figure 2 shows the feed roll of a corrugating machine that uses the rolls of this invention. 3 to 5 are partially cutaway front views showing different embodiments of the roll. A...Roll, 11...Roll body, 12...
Tube, 16...cylindrical body.

Claims (1)

[Claims for Utility Model Registration] 1. In a roll that rotates in direct or indirect contact with a corrugated sheet during the manufacturing or processing process of the corrugated sheet, a spiral hollow elastic protrusion is formed in the longitudinal direction of the roll body, A roll characterized in that a pressure medium is sealed in this hollow part. 2. The roll according to claim 1, wherein the protrusion is formed of a spirally wound tube.