JPS62173255A - Double facer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a double facer for paper processing machinery.

(Prior Art) FIG. 8 shows a schematic side view of a conventional double facer. In FIG. 8, a single-sided corrugated board sheet 1 made with a single facer (not shown) in the previous step is coated with starch glue 13 on the corrugated top of the corrugated paper by a glue machine 14, and then enters the double facer 5. On the other hand, the liner 2 is preheated by the break heater 4 and similarly enters the double facer 5. Single-sided corrugated sheet 1 and liner 2 in double facer 5
is held between a belt 8 driven by a roll 12 and a heating box 9 in a heating belt 6,
Furthermore, weight rolls 10 are arranged in a row on the back side of the heald 8.
is pressurized and transported. When passing through the heating bar 6, the starch paste is gelatinized by the heating of the heating box 9, which contains high-temperature steam, and the corrugated top of the corrugated paper of the single-sided corrugated sheet 1 and the liner 2 are bonded together. , double-sided cardboard 3 is obtained. This double-sided corrugated pole 3 is held between belts 8 and 11 and weight rolls 10 in the cooling part 7, and is carried out and sent to the next process.

In the conventional double facer, the sea urchin ytrol 10 is used to apply pressure to the double-sided corrugated board 3 and to promote heating in the heating part 6, but it has the following drawbacks.

That is, the weight roll 10 applies linear pressure due to its own weight to the double-sided corrugated cardboard 3 via the belt 8, so that the linear pressure by the weight roll 10 is applied to a soft corrugated sheet or a narrow corrugated sheet due to the local pressure. becomes larger, and collapse of the step as shown in FIGS. 9 and 10 occurs.

The main reason for this is that the heating of the glued area by the heating box 9 relies mainly on conduction heat through the container wall of the box 9 and the liner 2 that is in contact with it, so the two are crimped together as much as possible. This is because it is necessary to increase the thermal conductivity of the single-sided corrugated paperboard sheet 1, and therefore, it is necessary to apply a fairly strong pressing force to both of them from the back side of the single-sided corrugated cardboard sheet 1 using the weight roll 10. Moreover, in the conventional case, since such an indirect heating method is used, the heating efficiency is low, and the heating part inevitably has to be long.

(Problems to be Solved by the Invention) The present invention attempts to solve the problems of conventional double facers, such as occurrence of step collapse, low heating efficiency, and the heating part being forced to be long. It is.

(Means for Solving the Problems) Therefore, the present invention provides a double facer in which a double-sided corrugated sheet is formed by laminating and bonding a single-sided corrugated sheet and a liner that have been glued to the top of the corrugated portion in advance.・A hot air blowing device is installed at the bottom of the sheet to pressurize the bonded part with hot air before heating, and the upper part of the sheet is used as a bank amplifier to receive the sheet when pressurizing the sheet from the bottom side. This system is equipped with a hot air blowing device for heating the upper surface of the sheet with hot air, and this is used as a means to solve the problem.

(Function) The single-sided corrugated cardboard sheet conveyed to the heating part and the liner to be bonded to it are directly heated from above and below by hot air supplied from hot air blowing devices installed above and below the sheet, thereby making the glue stick. The temperature of the attached part increases while it is crimped,
The glue gels and dries to form a bond.

(Example) The present invention will be explained below with reference to embodiments of the drawings.

First, a side view of an apparatus according to a first embodiment of the present invention is shown in FIG.

In the heating part 6, instead of the conventional heating box 9 and weight rolls 10, this device has several units of hot air blowing devices 15 placed above and below with the cardboard sheet 3 in between, and conveyor rolls 16 between the units. has been established. Here, FIG. 1 shows the slit type shown in FIG. 2 as an example of a hot air blowing device. Hot air blowing device 15
Pressure air, which has been heat exchanged with steam etc. in advance, is led to the header H through a duct etc., and is then introduced into the sheet from above and below through the round hole 17 shown in Figs. 3 and 4 or the outlet of the slit 18 as shown in Fig. 2. It blows pressurized air.

At this time, the purpose of the lower hot air blowing device 15 is to heat and pressurize the sheet 3. In addition, the hot air blowing device at the top heats the sheet 3 from above, and at the same time,
This serves as a bank up to hold the sheet 3 when it is pressurized from below. Moreover, the roll 16 is
It is a light degree of contact that does not pressurize the sheet 3, and the sheet 3
It is not intended to pressurize the air, but rather to transport it. It also serves as support for the seat during emergency stops, starting, and termination.

Next, the operation of the embodiment shown in FIG. 1 will be described. The liner 2 bonded to the single-sided corrugated board sheet 1 is conveyed by the conveying roll 16 and enters the heating section 6. In the heating section 6, the round hole 17 or slit 1 of the hot air blowing device 15 installed above and below the seat
The sheet 3 is heated directly from the top and bottom surfaces by the hot air pump supplied from the hot air pump 8, and the dynamic pressure of the hot air from the top surface is used as a backup amplifier, and the dynamic pressure of the hot air from the bottom surface is simultaneously applied to the sheet 3. The temperature of the attached part increases while it is pressed, and the glue turns into a gel and dries to form a bond. Here, the hot air conditions to be supplied to the hot air blowing device 15 are as follows: temperature: 150 to 180;
If the speed is about 0 m/s, heating and pressurizing conditions equivalent to conventional ones can be obtained.

Several units of the hot air blowing device 15 are installed above and below the sheet, and between the units, the above-mentioned conveyance rolls 16 are also installed above and below, for the purpose of conveyance as well as to prevent the sheet 3 from wobbling and meandering. This prevents the sheet from coming into contact with the hot air blowing device 15 and causing scratches. The corrugated cardboard sheet 3 that has been bonded in this manner is held between belts 11.degree. 11 disposed above and below in the cooling bar 7, and is transported out of the double facer 5 as a product while being cooled.

Next, FIGS. 5 to 7 show a second embodiment of the present invention, and a sixth embodiment of the present invention is shown in FIGS.
The figures are XX and ZZ sectional views of FIG. 5, and FIG. 7 is YY and WW sectional views of FIG. 5. As shown in FIGS. 6 and 7, in this embodiment, end plates 19 are provided at the ends of the hot air blowing devices 15 and 15 provided above and below to close the gap between the blowing devices 15. However, pairs of hot air blowing devices adjacent in the sheet flow direction are alternately installed so that the side ends to which the end plates 19 are attached are in opposite positions.

By attaching this end plate 19, the corrugated sheet 3
The flow direction of the hot air flowing through the widthwise gap alternates,
Drying spots in the width direction of the sheet can be prevented, and the thrust force acting on the sheet in the width direction is also offset, producing a self-centering effect.

Further, a portion of the hot air passes through the space of the sheet by the end plate 19, and acts directly on the starch glue bonding area to accelerate drying. Since the end plates 19 are installed alternately on the front side and the puncture side in the direction of travel for each unit, the hot air changes direction as the seat advances, as shown by the arrows in FIGS. 6 and 7. It flows while changing, and acts evenly on the glued area. However, the other configurations, functions and effects are the same as in the case of FIG.

(Effects of the Invention) The present invention is configured as described in detail above, and pressurization is performed using dynamic pressure of hot air instead of the conventional weight roll, so that the occurrence of step collapse is eliminated. Uniform pressure can be applied, and sheet quality can be expected to improve. In addition, since the sheet is heated directly by hot air, it is extremely effective in raising the temperature of the sheet, and compared to indirect heating by heat conduction using a conventional heating box, thermal energy is significantly saved. Not only can this be achieved, but the line length of the heating bar of the device can be shortened.

[Brief explanation of drawings]

Fig. 1 is a side sectional view of a double facer showing an embodiment of the present invention, Fig. 2 is a perspective view of the hot air blowing device in Fig. 1, and Figs. A perspective view of the blowing device, FIG. 5 is a side sectional view of a double facer of a different embodiment from FIG. 1, and FIG.
Z sectional view, FIG. 7 is y-y and W-W sectional view of FIG. 5,
FIG. 8 is a side sectional view of a conventional double facer, FIG. 9 is a side sectional view showing a collapsed state in the case of FIG. 8, and FIG. 10 is an enlarged view of the main part in FIG. 9. Explanation of the main parts of the diagram ■ - Single-sided corrugated sheet 2 - Liner 3 - Double-sided corrugated sheet 6 - Heating bar 13 - Starch glue 15 - Hot air blower 17 - Round hole 18 - Slit patent applicant Mitsubishi Heavy Industries, Ltd. Ryomei Giken Co., Ltd. Figure 2 Figure 3

Claims (1)

[Claims] In a double facer, in which a double-sided corrugated sheet is formed by stacking and bonding a liner and a single-sided corrugated sheet pasted on the corrugated top, a hot air blower is installed at the bottom of the corrugated sheet to be bonded to heat and pressurize the bonded portion with hot air. The apparatus is characterized in that a hot air blowing device is installed above the sheet as a backup for receiving the sheet when pressurizing the sheet from the lower side, and also for heating the upper surface of the sheet with hot air. double facer.