JPS62173241A - 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. 5 shows a schematic side view of a conventional double facer. In FIG. 5, 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 tops of the eight corrugated papers 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 feed +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 arranged in a row on the back side of the belt 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 has high-temperature steam inside, and the corrugated top of the corrugated 8 paper of the single-sided corrugated sheet 1 and the liner 2 are adhered. It becomes double-sided cardboard 3. This double-sided corrugated cardboard 3 is held between belts 8 and 11 and weight rolls 10 in the cooling bar 7, and is carried out and sent to the next process.

In the conventional double facer, the weight roll 1
No. 0 is intended to apply pressure to the double-sided corrugated board 3 and promote heating with the heating bar 6, but it had 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. 6 and 7 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 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 pole sheet 1, and therefore it is necessary to apply a considerably strong pressing force to both of the above-mentioned members from the back side of the single-sided corrugated pole sheet 1 using the weight rolls 10. Moreover, in the conventional case, since such an indirect heating method is used, the heating efficiency is low (and the heating bar 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 the occurrence of step collapse, low heating efficiency, and the necessity for a long heating bar. It is.

(Means for Solving the Problems) Therefore, the present invention provides a double facer in which a liner is stacked on a single-sided corrugated board sheet pasted on the top of the corrugation, and the two are laminated together to form a double-sided corrugated board. A supporting member is disposed in contact with the liner to support and transport it in a flat manner, and hot air blowing devices are provided at appropriate intervals on the liner surface side.This is a means for solving the problem. That is.

(Function) A single-sided corrugated sheet supported in a planar manner by a support member,
The liner to be bonded to the liner enters the heating section, where it is heated by hot air supplied from a hot air blower, and is pressed against the support member by its dynamic pressure and pressurized, and the liner to be glued is pressed against the support member. Pasting is done.

(Embodiments) The present invention will be described below with reference to embodiments of the drawings. FIGS. 1 to 4 show embodiments of the present invention.

First, in FIG. 1, which is a side sectional view, the heating bar 6 is
In place of the conventional heating box 9 and weight roll 10 disposed on the back side of the belt 8, hot air blowing device 1 is installed, respectively! l! A plate-shaped back amplifier 16 is provided. Note that FIG. 1 shows an example in which the hot air Suita apparatus shown in FIG. 2 is installed. By the way, the hot air blowing device 15 guides hot air, which has been heat exchanged with steam or the like in advance, to the header through a duct or the like, and blows the hot air through the round hole 19 shown in FIGS. 3 to 4 or the slit 18 shown in FIG. It is sprayed directly onto the pole 3.

The backup 16 is installed on the upper side of the cardboard 3 and plays the role of support when the dynamic pressure of hot air from the bottom is applied to the cardboard 3, and is made of, for example, an iron plate.

Reference numeral 17 is an auxiliary roll for transporting the cardboard, which also serves as support for the cardboard during an emergency stop, start, or termination.
This is a slight degree of contact and is not intended to pressurize the double-sided corrugated pole 3.

Next, to explain the operation of the embodiment configured as above, the liner 2 bonded to the single-sided corrugated pole sheet 1 is
It is conveyed by the belt 8 driven by the roll 12 and the first auxiliary roll 17 and enters the heating section 6 . In the heating section 6, the double-sided corrugated pole 3 is heated by the hot air supplied from the round hole 19 or the slit 18 of the hot air blowing device 15, and the double-sided corrugated pole 3 is pressed by the belt 8 supported by the back amplifier 16 using the dynamic pressure. is,
The glued portions are pasted. The hot air condition is temperature 15
0-180℃.

If the wind speed is approximately 50 to 100 m/s, heating and pressurizing conditions equivalent to those of the conventional method can be obtained.

The hot air blowing device 15 is installed in several units, and between the units, there is an auxiliary roll 1 for conveyance that also serves as support for the cardboard in an emergency, or at the time of start-up or termination.
7 will be provided. This roll 17 also prevents the corrugated cardboard 3 from being damaged due to contact with a blow-out portion or the like.

In addition, instead of the supporting member of the corrugated pole sheet adopted in the above embodiment, that is, the plate-shaped punch-up 16 installed opposite to the back surface of the belt 8, a guide roll for guiding the bell l-8 in a plane is used. It may also be provided and supported.

(Effects of the Invention) The present invention is constructed as described in detail above, and instead of conventional weight rolls, the dynamic pressure of hot air is used for bonding. It is possible to pressurize and improve quality.Also, instead of the conventional heating box type sheet heating method using heat conduction,
Since we adopted a direct heating method using hot air, it is possible to rapidly heat the glued part, making it possible to shorten the line length of the heating part.

[Brief explanation of drawings]

Figure 1 is a side sectional view of the entire double facer showing an embodiment of the present invention, Figure 2 is a perspective view of a hot air blowing device showing an embodiment in which the hot air outlet is a slit hole, and Figure 3 is a rounded hot air outlet. FIG. 4 is a perspective view of a hot air blowing device showing an embodiment in which the holes are arranged in a zigzag pattern; FIG. The figure is a side sectional view of the entire conventional double facer, FIG. 6 is a side sectional view showing the state of step collapse in the case of FIG. 5, and FIG.
It is an enlarged view of the main part of the figure. Explanation of the main parts of the figure 1 - Single-sided corrugated board sheet 2 - Liner 3 - Double-sided corrugated board 8 - Belt 13 - Starch paste 15 - Hot air blowing device 16 - Backup (supporting member) 17 - Conveyance auxiliary roll 18 - Slit 19...-9 holes

Claims (1)

[Claims] In a double facer in which a liner is stacked on a single-sided corrugated board sheet that has been glued to the top of the corrugated board in advance, and the two are bonded together to form a double-sided corrugated board, a support member is arranged to abut against the surface of the single-sided corrugated cardboard sheet and support and convey it in a flat shape. In addition, a double facer characterized in that hot air blowing devices are provided on the liner surface side at appropriate intervals.