JPS5933636Y2 - single facer - Google Patents

Description

[Detailed description of the invention] An example of a conventional single facer will be explained with reference to FIG. It is formed (staged) along the

The rolled base paper is rotated while being accommodated in the steps (teeth) of the lower forming roll 3, and glue 5 is applied to the top of the step by the roll 4, and the liner paper 7 is applied by the rotating pressure roll 6. It is pasted with.

A single-sided corrugated paperboard (single-face) 8 is manufactured by the above-described continuous action.

FIG. 2 is a partially sectional front view of the pressure roll 6 used in the general single facer shown in FIG. The same roll 3 is used to provide lamination and transfer force for the laminated material.
, usually nip between 6.

Adding pressure.

For this reason, the outer diameter of the pressure roll 6 is provided with a crown as shown in FIG. 2 for the purpose of correcting the deflection caused by the nip pressure and the weight of the lower forming roll 3 and the pressure roll 6.
Crown amount δ).

This crown amount δ is determined by the pressure roll 6 and the lower forming roll 3.
It must be designed based on the roll dimensions such as surface length, outer diameter, and wall thickness, as well as operating conditions, but each manufacturer has the know-how as to how to properly provide the roll.

In the conventional normal method of physically giving the above-mentioned crown amount to the outer diameter portion of the pressure roll 6 by processing means such as machining,
It is not possible to adjust the amount of crown to correspond to the operating conditions (production speed, corrugated paper being passed, etc.), and it is often necessary to set the appropriate amount of crown through trial and error machining several times through test runs. there were.

Since the conventional machine does not have a structure in which the crown amount is variable, the following problems occur.

In other words, the crown is caused by liner paper cracking caused by vibration (which occurs due to excessive impact load being applied to the paper when the base paper 1 and liner paper 7 are bonded between the lower forming roll 3 and pressure roll 6), bonding Defects (occurs when the vibration displacement of the pressure roll 6 is over-regulated by a stopper to suppress the previous liner paper 7 cracking), base paper cracks (stage formation between the upper and lower forming rolls 2.3), This is a major factor that influences the occurrence of problems such as excessive impact loads being applied to the paper when rolling is carried out, and these troubles will occur if the proper rounding is not applied.

Note that 9 in FIG. 2 is a gap, and heated steam is usually placed in the gap between the upper and lower forming rolls 2 and 3 together with the pressure roll 6 to facilitate the formation of the horizontal paper and the lamination of the base paper and the liner paper. It is designed to be ventilated.

In addition, the above-mentioned trouble is caused by the form of contact between the rolls,
Due to the size of the collision load that is affected by this, if the load is not distributed uniformly, excessive load will be applied locally to the paper, and even if these problems do not result, the press mark will be damaged. There was a drawback that the quality of the uniform product (cardboard) deteriorated.

In addition, with a single facer, the vibration characteristics change depending on the type and size of the paper being passed, and the vibration characteristics change within the normal operating speed range (0 to
300 m/m1n), there are three resonant velocities.

Therefore, setting an appropriate load distribution using pressure rolls with a certain amount of crown (conventionally handled by adjusting the pressurizing force between the rolls and the stopper) depends on the skill level of the operator, and also requires technical expertise. There were also limits.

Furthermore, applying a crown to the outer diameter portion of the roll by machining such as grinding or cutting requires sophisticated processing technology and processing equipment, which has the disadvantage of increasing processing costs.

In addition, the above-mentioned liner paper cracks, poor lamination, base paper cracks, etc.
This is the main problem caused by the crown in single facers.

Therefore, in design, it is necessary to prevent such troubles, but these are not completely understood as vibration systems, and no perfect design method has been established.

Therefore, the inventors of the present invention focused on the fact that a structure in which the amount of crown does not change complicates the operating know-how of the machine and is the main cause of trouble, and considered a variable structure for the crown.

The variable crown means that the crown of the pressure roll changes when the pressure roll is not pressed against the corrugating roll, and appears as a change in the pressing force when it is pressed against the corrugating roll.

That is, in the single facer, the present invention introduces heated steam or pressurizing liquid into the roll hollow part of one of a pair of corrugated rolls and/or the pressure roll, and creates a cavity along the axial direction in the roll outer wall. By forming a cavity and introducing a pressurizing liquid or heated steam into the same cavity, and filling the pressurizing liquid using a pressurizing mechanism so that the pressure can be adjusted, multidimensional operating force becomes possible. The aim is to provide a single facer that can improve the quality of cardboard and eliminate problems.

The present invention will be described below with reference to the embodiments shown in the drawings. FIG. 3 is a partially sectional side view of a pressure roll 10 showing an embodiment of the present invention, and this pressure roll 10 is used in place of the pressure roll 6 of FIG. 1. All other mechanisms in FIG. 1 are applied to the single facer of the present invention.

Therefore, in explaining the present invention, the first
The symbols of each mechanism in the figure will be used as they are.

Now, in FIGS. 3 to 5, the pressure roll 10 has a pressurizing liquid hole 13 formed by a gap between the roll center axis 11 and the roll shell 12, and a large number of heating holes on the circumference inside the roll shell 12. A steam hole 14 and a coolant hole 15 are provided in the axial direction (the coolant hole 15 is not necessary in cases where heating of the pressurizing liquid is not a problem, and in cases where viscosity deterioration due to temperature rise and pressurizing ability etc. are not affected). Each hole is connected to a hole drilled at the end of the roll.

That is, heated steam was vented to the steam holes 14 of the roll shell 12 through the inlet 16, the rotary seal 17, and several steam holes 14a formed at the end of the roll, thereby heating the outer surface of the roll shell 12. Thereafter, the gas is exhausted from the exhaust port 18 through a steam hole (not shown) drilled in the end of the roll on the opposite side and a rotary seal 17 .

Similarly, the coolant is passed through the inlet 19, the rotary seal 17, and several coolant holes 15a drilled at the end of the roll, and then into the coolant hole 15 of the roll shell 12, after cooling the pressurizing liquid. , several coolant holes (not shown) drilled in the opposite roll end, and the discharge port 2 through the rotary seal 17.
Ejected from 0.

On the other hand, the pressurizing liquid passes through the rotary seal 17 from the inlet 21, passes through the hole 22 formed in the central axis 11 of the roll, and is led to the gap inside the roll, that is, the pressurizing liquid hole 13.

Therefore, the crown is formed by deforming the roll shell 12 by the pressurizing force of the liquid in the pressurizing liquid hole 13.

An ideal deformation curve is obtained in which the deformation of the roll shell 12 due to this liquid pressure is greatest at the center of the roll, where the rigidity is lowest, and less deformed toward the ends of the roll, where the rigidity is highest.

Note that even if the wall thickness of the roll shell 12 is uniform, it seems that the desired deformation curve can be obtained sufficiently, but it is possible to change the wall thickness (gradually decrease or increase from the center of the roll toward the ends, etc.) By doing so, it becomes possible to obtain the most desired deformation curve.

Further, although the above-mentioned crown is conceptually explained assuming a state in which the corrugated roll is not pressed, when it is pressed, it appears as a change in the pressing force.

Note that 23 in FIG. 3 is a bearing supporting the pressure roll 10, 24 in FIG. 4 is a heating steam seal ring, and 25 is a cooling liquid seal ring.

Now, the pressure roll 10 shown in FIG. 3 is sandwiched between the outer surface of the lower forming roll 3 (FIG. 1) and the outer surface of the pressure roll 10 by the pressure of the liquid filled in the pressure liquid holes 13 inside the roll. This applies pressure to the base paper 1 and liner paper 7, which are folded and moved.

Therefore, by changing the pressure of the liquid in the pressurizing liquid hole 13, the pressure applied to the paper can be freely adjusted.Moreover, since there is no physical rounding, the pressure can be adjusted to equalize the pressure in the axial direction. It is also easy to adjust.

FIG. 6 shows a simple block diagram of the pressurizing liquid supply and control device.

Constant value control of the pressing force or optimal control of the pressing force adapted to the type of paper can be achieved by known control methods.

In general, it is easy to control (using a check valve, etc.) to maintain the liquid pressure constant in response to changes in liquid temperature and changes in external force acting on the nip.

Incidentally, such a structure can also be applied to the upper forming roll 2 shown in FIG.

Next, FIG. 7 shows another embodiment of the pressure roll 10, in which heating steam is passed through the heating steam hole 26a into the gap 26 inside the roll, and the shielding/closing roll 27 is separated from the roll. Although the structure is such that the space between the shells 12, that is, the pressurizing liquid hole 28, is filled with the pressurizing liquid via the liquid 7L28a drilled at the end of the roll, there is no difference in operation and effect.

In the figure, 29 and 30 are seal rings, and 31 is a steam exhaust siphon.

As explained in detail above, the present invention introduces heated steam or pressurizing liquid into the hollow part of one of a pair of corrugated rolls and/or the pressure roll, and forms a cavity along the axial direction in the outer wall of the roll. Then, a pressurizing liquid or heated steam is introduced into the cavity, and the pressurizing liquid is filled using a pressure mechanism so that the pressure can be adjusted. Forming rolls and pressure rolls have the lowest rigidity at the center of the roll, so the pressure applied to the cavity greatly deforms the center of the roll outward, changing the crown, and this crown bonds the liner paper to the base paper. It is possible to prevent troubles from occurring.

Moreover, since the crown is not machined by cutting or other processing like conventional fixed crowns, there is no need for complicated processing techniques, and the roll structure is simple.
There are no drawbacks that would increase costs.

Therefore, according to the present invention, since the crown can be adjusted, multi-dimensional operation is possible, which improves the quality of corrugated cardboard and eliminates troubles.It also makes it possible to adjust the pressure to equalize it in the axial direction. is also easy.

Note that by adding an automatic fluid pressure control device to the fluid processing mechanism of the present invention, constant value control or optimal control of the nip pressure can be easily realized.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an example of a conventional single facer, Fig. 2 is a partial sectional side view of the pressure roll shown in Fig. 1, and Fig. 3 is a side sectional view showing an example of a conventional single facer.
Figure 1 is a partial cross-sectional side view of a pressure roll showing an embodiment of the present invention, Figure 4 is an enlarged view of part A in Figure 3, and Figure 5 is an enlarged view of part B in Figure 4.
-B sectional view, FIG. 6 is a block diagram of the liquid pressure supply and control device, FIG. 7 is a partial sectional side view of the pressure roll showing an embodiment different from FIG. 3, and FIG. 8 is C of FIG. 7. -C sectional view. Explanation of the main parts of the figure 1...Base paper, 3...
...lower forming roll, 5...glue, 7...
・Liver paper, 1o...pressure roll, 12...
...Roll shell (roll outer wall), 13...
- Pressurizing liquid hole, 28... Pressurizing liquid hole.

Claims (1)

[Scope of utility model registration request] A single unit consisting of a pair of corrugating rolls for corrugating the base paper, and a pressure roll that is placed in pressure contact with one of the same pair of corrugating rolls and laminating the liner paper to the glued base paper after corrugating. In the facer, heated steam or pressurizing liquid is introduced into the hollow part of one of the pair of corrugating rolls and/or the pressure roll, and a cavity is formed along the axial direction in the outer wall of the roll. A single facer characterized in that a pressurizing liquid or heated vapor is introduced into the cavity and the pressurizing liquid is filled using a pressurizing mechanism so that the pressure can be adjusted.