JPH08174722A - Heating part of double facer - Google Patents

Abstract

PURPOSE: To provide a heating part of a double facer that can produce a high- quality double faced corrugated sheet having a good flatness without collapsing both end parts and can enhance a productivity to a great extent by increasing a pressing force at the time of production. CONSTITUTION: In a heating part of a double facer, a single faced corrugated sheet 1 and a liner 3 are clamped and transported between a heating box 4 and a pressurizing belt 6, and a pressurizing force by compressed air in an air chamber 5 provided on the pressurizing belt 6 is used as a pressing means for bonding them. At the bottom of the air chamber 5, a plurality of section steel 8 spanning in the width direction of the corrugated sheet are juxtaposed in the forward moving direction of the sheet in slide contact with the top surface of the pressurizing belt 6. The section steels 8 are airtightly bonded to the lower peripheral end of the air chamber 5 with a degree of freedom in a vertical direction. A pneumatic pressure in the air chamber 5 is applied to the pressurizing belt 6 through the group of section steel 8 to produce a pressing force.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double facer heating part applied to a corrugated machine.

[0002]

2. Description of the Related Art A double facer of a corrugated machine has a heating part 1 as shown in the block diagram of FIG.
4 and a cooling part 15, and a single-sided corrugated sheet 1 and a liner 3 which are made by a single facer (not shown) in the previous step are attached to each other to form a double-sided corrugated sheet 7 or a double-sided corrugated sheet. It is a device.

4A and 4B are explanatory views of the structure of a heating part of a conventional double facer. FIG. 4A is a side view and FIG. 4B is a plan view. The configuration of the conventional example will be described with reference to FIGS. 4 and 6. The double facer comprises a heating part 14 and a cooling part 15. The heating part 14 is composed of a preheating part 16, a heating box (heating plate) 4, a pressure belt 6, a pressure part 17, etc. Conveyor belt 1
8, a pressure belt 6, a pressure unit 19, and the like.

Pressurizing part 17 of the heating part 14
Is composed of a blower 21, which is a supply source of compressed air, a supply pipe 22 of compressed air, an air chamber 5, and the like.
The pressing force necessary for bonding the single-sided corrugated board sheet 1 and the liner 3 is generated via the. The pressing force is uniform,
Moreover, it is required that the strength of the single-faced cardboard sheet 1 does not crush the stepped portion.

Next, the operation of the double facer having the above construction will be described. Pass the glueing machine 20,
The liner 3 preheated and tempered by the preheating unit 16 is provided with a heating box (heating plate) 4 disposed on the lower side and appropriately heated by steam, and an endless pressure belt wound from the upper side. It is carried in the middle part of No. 6.
Further, the single-faced corrugated board sheet 1 produced by the single facer in the previous step is carried in to the intermediate portion from the other route with the adhesive 2 attached to the step top portion thereof,
And liner 3 are pressure belt 6 and heating box 4
The sheet is conveyed in a state of being sandwiched between the sheets and is attached to the sheet while being appropriately heated and pressed, thereby forming a double-faced corrugated cardboard sheet 7.

The cooling part 15 is a cooling process part of the double-sided corrugated board sheet 7 formed in the heating part 14, and the double-sided corrugated board sheet 7 is formed by the pressure belt 6 running on the upper part and the transport belt 18 running on the lower part.
The sheet is sandwiched, and the sheet is conveyed with a proper pressing force applied by the pressurizing unit 19. By passing the cooling part 15, the bonded state of the single-faced corrugated board sheet 1 and the liner 3 bonded by the heating part 14 is further ensured, and the function such as correcting distortion and warpage caused by cooling is fulfilled.

Double Facer Heating Part 14
The width of the single-sided corrugated board sheet 1 and the liner 3 that are loaded into the machine is set to the standard width that can be most economically shaped as the material for the corrugated board box that is created in the next step, so it varies from the maximum width to the minimum width. There are various sizes. For this reason,
The heating part 14 applies heating at an optimum level and uniform pressing force in the lateral direction to the single-faced corrugated cardboard sheet 1 and the liner 3 which are sandwiched and conveyed by the heating box (heating plate) 4 and the pressure belt 6. It is required to work.

[0008]

However, in the conventional heating part 14, the air chamber 5 has a fixed wall having a width corresponding to the maximum width of the double-faced corrugated cardboard sheet 7 to be produced. It is arranged so as to be in direct sliding contact with the upper surface of the pressure belt 6. Therefore, the following points have been pointed out as issues that need to be resolved.

When a double-sided corrugated board sheet 7 having a width smaller than the width of the fixed wall of the air chamber 5 is to be produced,
As shown in FIG. 5 (a), air pressure acts on the area in which the double-sided corrugated cardboard sheet 7 does not exist in the widthwise direction via the pressure belt 6, so that both side edges of the corrugated cardboard sheet are pushed more than the central portion. It will be under pressure, and both ends will be crushed.

Further, as shown in FIG. 5 (a),
A lower end of a side wall of the air chamber 5 which is fixedly provided,
A gap is formed between the pressure belt 6 and the pressure belt 6 which is bent downward by the action of air pressure, and air leaks from the air chamber 5 becomes large. For this reason, it becomes difficult to generate a uniform pressing force in the lateral width direction, the air pressure cannot be maintained at an appropriate level, and the production speed of the double-faced corrugated sheet 7 is limited under a low pressing force. It was impossible to improve the sex.

An object of the present invention is to produce a high-quality double-faced corrugated board sheet having good flatness without crushing both end portions of the double-faced corrugated board sheet, and to increase the pressing force at the time of making the double-faced corrugated board sheet. It is an object to provide a heating part of a double facer capable of improving the sheet forming speed, that is, the productivity of the sheet.

[0012]

A heating part of a double facer according to the present invention comprises a heating box 4 and a pressure belt 6 provided so as to face the box, and a single-faced corrugated fiberboard sheet 1 carried into an intermediate portion thereof. A double facer heater that conveys the liner 3 while sandwiching the liner 3 and uses the pressing force of the compressed air in the air chamber 5 disposed on the upper side surface of the pressure belt as a pressing means when the cardboard sheet and the liner are bonded together. In the topping part, a plurality of shaped steels 8 slidably contacting the upper side surface of the pressure belt 6 on the bottom of the air chamber 5 and suspended in the lateral width direction of the corrugated board sheet are arranged in parallel along the traveling direction of the corrugated board sheet, and Airtightness is maintained between the lower end of the air chamber 5 and the air chamber 5 while allowing a slight degree of freedom in the vertical direction, and the air pressure in the air chamber 5 is maintained at the bottom. In addition to the pressure belt 6 through the section steel 8 group which forms a, characterized in that to generate a pressing force.

[0013]

With the above structure, the pressure belt 6 is not directly pressed by the compressed air sent into the air chamber 5,
The pressure belt 6 is indirectly pressed through the group of shaped steels 8 arranged in parallel with the upper surface of the pressure belt 6 on the bottom of the air chamber 5. As a result, the fluctuation of the surface pressure of the corrugated board sheet in the lateral width direction was reduced, and the bending deformation at the lateral width direction end of the pressure belt 6 could be suppressed.

As a result, the problem that both end portions of the corrugated board sheet are crushed is solved and the airtightness of the lower end portion of the side wall of the air chamber 5 is improved, so that air leakage is reduced and the pressure of compressed air is increased. You can now set. Therefore, the bonding performance of the corrugated board sheet has been improved, and the productivity thereof has been significantly improved.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of the structure of a heating part of a double facer according to a first embodiment of the present invention.
1A is a side view, FIG. 1B is a plan view, FIG. 2A is a detailed view of a portion A in FIG. 1A, and FIG.
FIG. 2A is a cross-sectional view taken along the line II-II in FIG. In these figures, reference numerals 1-7 and 21,22
The names of the elements shown in are the same as those in the conventional example shown in FIGS. 4A and 4B, where 1 is a single-sided corrugated board sheet, 2
Is an adhesive, 3 is a liner, 4 is a heating box (heating plate), 5 is an air chamber, 6 is a pressure belt, 7 is a double-faced corrugated sheet, 21 is a blower, and 22 is an air supply pipe. Elements denoted by reference numerals 8 to 13 are elements applied to the first embodiment of the present invention, 8 is a shaped steel, 9 is a rubber plate, and 10 is a rubber plate.
11 and 12 are rubber sheets, 12 is a pin, and 13 is a perforated plate.

Next, referring to FIGS. 1 (a), 1 (b) and 2 (a),
The configuration and operation of the first embodiment will be described with reference to (b). Adhesive 2 is attached to the top of the single-faced corrugated board sheet 1 made by the single facer (not shown) in the previous process of the double facer, and the liner 3 sent via another route is overlaid and the lower side The heating box (heating plate) 4 disposed in the air chamber 5 and the compressed air supplied into the air chamber 5 are carried into the middle of the pressure belt 6 which is pressed from the upper surface through the shaped steel 8 group, and are appropriately fed. The double-faced corrugated cardboard sheet 7 is prepared by transporting the double-faced corrugated cardboard sheet 7 while sandwiching it while applying heat and pressing force.

In the manufacturing process, the upper surface of the pressure belt 6 was directly pressed by the compressed air in the air chamber 5 in the conventional example, but in the embodiment, the pressure belt 6 is indirectly applied via the shaped steel 8 group. The feature is that is pressed. As shown in FIGS. 1 (a) and 1 (b), a plurality of shaped steels 8 are placed in the bottom portion of the air chamber 5 and in sliding contact with the upper surface of the pressure belt 6 in the width direction of the corrugated cardboard sheet. The cardboard sheets are arranged side by side in the traveling direction.

As shown in FIG. 2A, in order to prevent air from leaking from the inside of the air chamber 5, a gap formed between the shaped steels 8 adjacent to each other is sealed with a rubber plate 9. The clearance between the engaged lower end of the air chamber 5 and the shaped steel 8 is also sealed by a sealing material such as the rubber sheets 10 and 11.

As the shaped steel 8, for example, shaped steel (channel) or I-shaped steel is used. As shown in FIG. 2 (b), the pin 12 protruding from the air chamber 5 is attached to the shaped steel 8
Is inserted into the long holes of the perforated plate 13 fixed to both ends in the longitudinal direction to prevent the shaped steel 8 from shifting in the running direction of the belt 6 and to the air chamber 5 only in the vertical direction. I have a degree of freedom within. Note that FIG.
(C) is a pin 1 for the engagement method of the air chamber 5 and the shaped steel 8.
FIG. 2 is a sectional view taken along the line II-II in FIG. 1 and a side view of the portion in a second embodiment using two two. The operation in this configuration is similar to that in the case of FIG.

With the above-mentioned structure, all the pressure force of the compressed air sent into the air chamber 5 indirectly acts on the pressure belt 6 through the shaped steel 8 group forming the bottom of the air chamber 5. Therefore, the bending deformation of the lateral width direction side end portion of the pressure belt, which is a problem in the conventional method of directly acting on the upper surface of the pressure belt 6, is suppressed. This solves the problem that the step tops are crushed at both width ends of the single-sided corrugated board sheet 1, and it is possible to produce a high-quality double-sided corrugated board sheet 7 having good flatness.

FIG. 3 is a comparison diagram of the measurement results of the acting surface pressure with respect to the lateral width direction (longitudinal direction of the shaped steel) position of the double-faced corrugated board sheet 7 for both the heating parts of the embodiment and the conventional method. Compared with the conventional method in which the air pressure is directly applied to the pressure belt 6, the embodiment in which the pressure belt 6 is indirectly pressed through the shaped steel group 8 has a smaller fluctuation in the acting surface pressure. You can see that

Further, since the lower end of the air chamber 5 is engaged with the shaped steel 8 having high rigidity, the airtightness against air leakage can be greatly improved, and the air pressure inside the air chamber 5 can be increased. Since the setting can be made high, the pressing time required for bonding the single-sided corrugated board sheet 1 and the liner 3 can be shortened, and the transport speed of the corrugated board sheet 7 to be produced is improved, that is, the productivity is improved. be able to.

The heating part of the double facer according to the present invention is constructed and operates as described above. However, regarding the shape of the shaped steel 8 and the sealing method of the lower end of the air chamber 5, the exemplified grooved steel or I-shaped steel is used. Besides, it is possible to use press molded products of thin steel plates, molded products of synthetic resin, etc., and apply synthetic resin as a material for sealing,
It is also possible to employ a brush sealing method.

[0024]

In the heating part of the double facer of the present invention, since the indirect pressurization method is performed through the plurality of shaped steels 8 arranged in parallel in the traveling direction of the corrugated board sheet, the conventional pressing force is applied. It is possible to mitigate the fluctuation of the acting surface pressure that has occurred at both ends of the pressure belt 6. That is,
The conventional problem that the bending deformation of the lateral end of the pressure belt 6 can be suppressed and both side ends of the corrugated cardboard sheet are crushed is solved.

Further, since it is configured to be engaged with the group of shaped steel 8 having high rigidity, the airtightness of the lower end portion of the side wall of the air chamber 5 can be improved, so that the internal air pressure can be set high. As a result of these efforts, it is possible to create high-quality double-faced corrugated sheet with good flatness without crushing both ends of the double-faced corrugated sheet, and increase the pressing force at the time of production to increase the production speed. It has become possible to improve, that is, to greatly improve productivity.

[Brief description of drawings]

FIG. 1 is a configuration explanatory view of a heating part of a double facer according to a first embodiment of the present invention, FIG.
Figure (b) is a plan view.

2 (a) is a detailed view of a portion A in FIG. 1 (a), and FIG. 2 (b) is a sectional view taken along the line II-II in FIG. 1 (a) and a side view of the portion. . FIG. 2C shows the second embodiment of the present invention.
FIG. 2A is a sectional view taken along the line II-II in FIG. 1A and a side view of the portion relating to the engagement method between the air chamber and the shaped steel as an embodiment.

FIG. 3 is a comparison diagram of the measurement results of the acting surface pressure with respect to the lateral width direction position of the double-faced corrugated board sheet for both the heating parts of the example and the conventional method.

4A and 4B are configuration explanatory views of a heating part of a conventional double facer, in which FIG. 4A is a side view and FIG. 4B is a plan view.

5A is an explanatory diagram of deformation of the pressure belt 6 in the heating part shown in FIG. 4, and FIG. 5B is a detailed view of an S portion in FIG.

FIG. 6 is an explanatory diagram of an overall configuration of a double facer in a corrugated machine.

[Explanation of symbols]

1 ... Single-sided corrugated sheet, 2 ... Adhesive, 3 ... Liner, 4
... heating box (heating plate), 5 ... air chamber, 6 ... pressure belt, 7 ... double-sided corrugated sheet, 8 ... shaped steel, 9 ... rubber plate, 10 ... rubber sheet, 11 ... rubber sheet, 12 ... pin, 13 ... Perforated plate, 14 ... Heating part, 15 ... Cooling part, 16 ... Preheating part,
Reference numeral 17 ... Pressure unit, 18 ... Conveying belt, 19 ... Pressure unit, 20
… Gluing machine, 21… Blower, 22… Air supply pipe.

Claims (1)

[Claims] 1. A heating box (4) and a pressure belt (6) provided so as to face the box, sandwich and convey the single-faced corrugated cardboard sheet (1) and liner (3) carried into the middle part thereof. At the same time, in the heating part of the double facer using the pressure force of the compressed air in the air chamber (5) arranged on the upper surface of the pressure belt as a pressing means when the cardboard sheet and the liner are bonded together, the air chamber A plurality of shaped steels (8), which are slidably contacted with the upper side surface of the pressure belt (6) at the bottom of (5) and are suspended in the widthwise direction of the corrugated board sheet, are arranged side by side along the traveling direction of the corrugated board sheet, and Airtightness is maintained with the periphery of the lower end of the chamber, and the air pressure in the air chamber (5) is joined by allowing a slight degree of freedom in the vertical direction, and the bottom of the shaped steel (8) group is used to form the bottom. A heating part for a double facer, characterized in that a pressing force is generated by adding it to a pressure belt (6).