JPH047942Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a double facer that can be used as a pressurizing device for sheets in a double facer heating part of a corrugating machine.

(Prior art) Fig. 1 is an overall side view of a general double facer device in a corrugating machine, and Figs.
The figure shows a typical conventional sheet pressure method in the heating part. Figures 4 and 5 show a system that uses weight roll pressure.
FIG. 4 is a side view, and FIG. 5 is a plan view. Further, FIGS. 6 and 7 show systems that employ air pressurization, with FIG. 6 being a side view and FIG. 7 being a plan view. Further, FIGS. 8 and 9 are diagrams for explaining problems. FIG. 8 is a diagram of defects in the conventional system, and FIG. 9 is a diagram of the state of the corrugated top portion of the single-sided corrugated cardboard core.

As shown in Fig. 1, the double facer device of a corrugate machine consists of a heating part 1 and a cooling part 2, and includes a single-sided corrugated sheet 3 and a liner 4 made by the single facer in the previous process. This is a device for making corrugated cardboard sheets 5 by pasting them together. The overall structure is assembled by the heating part 1 and the cooling part 2, and the heating part 1 consists of a preheating part 13, a heating box (hot plate) 14, a canvas belt 15, and a pressure part. 16 etc. Further, the cooling part 2 is composed of a conveyor belt 17, a canvas belt 15, a pressure section 18, and the like.

Next, the functions of each part will be explained. The preheating part 13 in the heating part 1 preheats and tempers the liner 4 supplied through the gluing machine 19, and then conveys it to the heating box 14. The heating box 14 is heated by steam and maintains the appropriate heating state necessary to assist in bonding the single-sided corrugated cardboard sheet 3 to the liner 4 which runs in sliding contact with the upper surface.

Also, the canvas belt 15 is a cardboard sheet 5
It is an endless belt that is located above the heating box 14 and runs and conveys the corrugated cardboard sheet 5 with the sheet sandwiched between it and the heating box 14, and it makes the pressing force uniform to some extent when manufacturing corrugated cardboard. It has a function of dispersing, and the pressurizing part 16 is
This is the part that applies the pressing force necessary for pasting the cardboard through the canvas belt 15. In addition, in the next process, cooling part 2, the corrugated cardboard sheet 5
upper and lower belts 15, 17
The corrugated paper sheet 5 is held between the pressing parts 18 and
(weight rolls) to convey with appropriate pressing force applied.

The types of cardboard are single-sided cardboard 3 and liner 4.
There are double-sided corrugated cardboard, double-sided corrugated cardboard, multiple double-sided corrugated cardboard, etc., depending on the number (combination) of sheets pasted together, and there are also classification methods such as the type according to the tiers (mountains) of the tiers, the type of paper used, etc. A wide variety of corrugated cardboard sheets are manufactured, and an appropriate one can be selected depending on the intended use of the corrugated cardboard sheet.

Now, glue 2 applied to the top of 3 layers of single-sided cardboard sheet
0, the same single-sided corrugated sheet 3 and liner 4
When bonding, moderate heating and pressing force are required, and this pressing force must be uniform and strong enough not to crush the corrugations (mountains) 10 of the single-sided corrugated sheet 3. .

For this reason, various methods of applying pressure have been proposed so far. FIGS. 4 to 7 are typical examples thereof, and FIGS. 4 and 5 are explanatory diagrams showing a weight roll pressurizing method, and FIGS. 6 and 7 are explanatory diagrams showing an air pressurizing method.

First, the weight roll pressing method shown in FIGS. 4 and 5 will be explained. This method applies the pressing force required for bonding the single-sided corrugated sheet 3 and the liner 4 together when manufacturing the corrugated sheet 5. This method uses a large number of weight rolls 21 arranged in parallel at the top via a canvas belt 15. Here, the pre-process glueing machine 19
The single-sided corrugated sheet 3 supplied from
As shown in the figure, the corrugated top portion 10 of the corrugated paper into which the moisture of the glue has permeated has become soft and is in a state where the ridges are easily crushed.

Therefore, if excessive pressure is uniformly applied in this state, the pressure crushing strength of the top portion 10, especially the sheet edge portion in the width direction of the sheet, will be reduced and the sheet will be easily crushed, resulting in the paper edge sagging as shown in FIG. It has the disadvantage of becoming a state. In addition, there was a high possibility that wrinkles would occur in thin sheets. For this reason, the weight roll 21 located at the sheet introduction part 9 in the heating part 1 is cranked as shown in FIG. In order to control the occurrence, a method is adopted in which pressure is applied from the center toward the side end faces in the width direction.

However, due to mechanical structural defects, it is difficult to adjust the pressure to respond to subtle fluctuations in conditions such as paper quality, glue condition, outside temperature, humidity, etc. In manufacturing, the weight roll method had drawbacks that could not be overcome.

Next, the air pressurization method shown in FIGS. 6 and 7 will be explained. In this example, the pressing force is obtained by air 22 instead of the weight roll 21 shown in FIGS. 4 and 5. As shown in the figure, the pressure of the compressed air 22 in the air chamber 23 is used for the pressing force necessary for laminating the corrugated cardboard sheet 5 via the canvas belt 15, but this method uses the weight roll. Compared to the method,
This has the effect of providing uniform pressing force.

However, the conventional air chamber 23 shown in FIGS. 6 and 7 has a rectangular shape corresponding to the width of the sheet, and when pressurized immediately after being supplied from the pre-process glueing machine 19 and when the glue is not dry,
Since the crushing strength is small at the edge portion of the sheet in the paper width direction, the sheet is easily crushed, and the disadvantage that the edge of the paper becomes sagging as shown in FIG. 8 cannot be avoided. In addition, the conditions required for the pressurizing method include being able to set a pressing force that corresponds to the crushing force at the core corrugated top portion 10 of the single-sided corrugated cardboard sheet 3, and being able to set a pressurizing state that does not cause wrinkles on the sheet. This becomes an important element.

(Problems to be Solved by the Invention) The pressing force in the conventional bonding process of single-sided corrugated cardboard sheets and liners, that is, in the heating part of the double facer device, is achieved by the method using weight roll pressure (No. 4), as described above.
, Fig. 5), a method using air pressurization (Fig. 6, Fig. 7), etc. have been proposed.

However, the method using weight roll pressure has defects such as pressure fluctuations, making it difficult to apply delicate weight rolls.Also, the method using air pressure has the characteristic of obtaining uniform pressure over the entire surface, but it does not have the same crushing strength over the entire width, and if the required pressing force is applied to the center, there is a risk that the peaks at the paper side edge, where the crushing force is small, will be crushed. In addition, both methods cannot be said to be reliable, as there is a risk of wrinkles occurring in the case of thin materials due to the way the pressure is applied, and this remains a major issue when producing high-quality corrugated sheets. It was a problem.

The present invention was proposed to solve these problems, and uses an air pressurization method to provide the air chamber of the heating part with the effect of preventing the edges of the sheet from collapsing and preventing the thin sheets from wrinkling. The aim is to provide a double phaser with

(Means for solving the problem) Therefore, the present invention uses a heating box provided on the lower side and a belt provided on the upper side to sandwich and bond the single-sided corrugated sheet and liner located intermediately. A heating device comprising: an air chamber having an air blowing port on the top surface for applying air pressure through the belt for bonding the single-sided corrugated sheet and the liner; In the double facer provided with a part, the side plate of the air chamber at the sheet introduction part is oriented in the conveying direction of the belt, and is formed into a substantially trapezoidal shape so that the front side is wider than the rear side, and the air pressure applied to the belt is applied sequentially from the center of the sheet. It is configured to move toward the side end in the width direction, and this is used as a means to solve the problem.

(Function) Since the air pressure supplied to the air chamber is applied uniformly to the bottom of the air chamber, which has a substantially trapezoidal shape on the side where the belt slides, the pressing force is applied only to the center of the width direction of the sheet at the sheet introduction part, which prevents the sheet from running. Accordingly, the force is sequentially moved and applied to the side edges of the sheet in the width direction, so that the generation of wrinkles on the sheet surface can be suppressed.

(Embodiment) The present invention will be described below with reference to the embodiment of the drawings. FIG. 1 shows a side view of the entire general double facer device in a corrugating machine. The present invention replaces the heating part in Fig. 1 with a second heating part.
The structure is similar to the embodiment shown in FIGS.
2 and 3 show a sheet introduction part of a heating part in which a sheet pressurizing method is folded in according to an embodiment of the present invention, and FIG. 2 is a side view and FIG. 3 is a plan view.

The overall schematic structure of the double facer according to the present invention is the same as that of the known conventional system as shown in FIG. 1, but the feature of the present invention is that as shown in FIG. The problem lies in the method of pressure required in the lamination of As shown in FIG. 3, the sliding contact portion of the air chamber 6 with the canvas belt 8 in the sheet introduction portion 9 of the heating part 1 has a substantially trapezoidal shape, and is installed as shown in FIG. Since the compressed air sent from the blower 11 is uniformly applied to the bottom of the chamber 6, a pressing force is applied only to the central part of the sheet introduction part 9 in the width direction, and as the sheet travels, force is applied to the side edges of the sheet in the width direction. will move and act.

Therefore, a small pressing force acts on the side edge portions having a low crushing strength before the lamination is completed, and the tendency of crushing the core paper corrugated top portion 10 at the sheet side edge portion is reduced. Furthermore, since the direction in which the pressing force is applied sequentially moves from the center to the widthwise side edges as the sheet travels, it is possible to suppress the occurrence of wrinkles on the sheet surface, which is a concern with thin materials.

(Effect of the invention) In general, the corrugated top part of the core paper of a single-sided corrugated board sheet glued in a pre-process gluing machine is soft due to its water content, and its crushing resistance is small. This tendency is even greater than in the center. Furthermore, in the case of thin sheets, depending on how the pressing force is applied, wrinkles often occur due to variations in lamination speed. For this reason, the ability to set the pressing force is a very important element in producing high-quality corrugated board. However, conventional pressurization methods have not been able to satisfy these requirements.

This invention improves the air chamber structure as an air pressurization source, and sets the pressurizing force higher at the center of the sheet width and lower at the paper side edge to correspond to the crushing force of the corrugated cardboard sheet, making it compatible with the running of corrugated cardboard. Since the pressurizing force is moved from the center to the width side edges, it is possible to reduce the problems of conventional problems such as crushing and wrinkles at the sheet side edges. Therefore, the defect rate can be reduced, and many effects such as high quality and high productivity in the next process can be expected.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of a double facer in a general corrugating machine, Fig. 2 is a side view of a heating part showing an embodiment of the present invention, and Fig. 3 is a side view of a double facer in a general corrugating machine.
4 is a side view of the heating part in a conventional double facer, FIG. 5 is a plan view of the same, and FIG. 6 is a side view of the heating part showing another example of the conventional double facer. Figure 7 is the same plan view, Figure 8
The figure is a front view illustrating the drawbacks of the conventional method, and FIG. 9 is an explanatory diagram of the corrugated top portion of a single-sided corrugated core paper. Explanation of the main parts of the diagram, 1...Heating part, 2...Single-sided corrugated sheet, 4...Liner,
5... Double-sided cardboard sheet, 6, 7... Air chamber, 8... Canvas belt, 9... Sheet introduction part, 11... Blower, 12... Partition plate, 14...
...heating box, 16...pressure section.

Claims (1)

[Scope of utility model registration request] A heating box provided on the lower side and a belt provided on the upper side transport the single-sided corrugated cardboard sheet located in the middle part and the liner while sandwiching and pasting them together. In a double facer equipped with a heating part comprising an air chamber having an air blowing port on the upper surface for applying air pressurizing force for bonding the corrugated sheet and the liner through a belt, the side plate of the air chamber at the sheet introduction part is The belt is formed into a substantially trapezoidal shape so that the front side is wider than the rear side in the conveyance direction, and the air pressure applied to the belt is sequentially moved from the center of the sheet to the side edges in the width direction. double faisa.