JP3377636B2 - Double facer heating part - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating part of a double facer applied to a corrugating machine. 2. Description of the Related Art A double facer of a corrugating machine has a heating part 1 as shown in the block diagram of FIG.
A single-faced corrugated cardboard sheet 1 and a liner 3 formed by a single facer (not shown) in the preceding process, which is composed of a cooling part 15 and a cooling part 15, are laminated to form a double-faced corrugated cardboard sheet 7 and a double-faced corrugated cardboard sheet. Device. FIGS. 4A and 4B are explanatory diagrams of a configuration 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. The double facer includes a heating part 14 and a cooling part 15, and the heating part 14 includes a preheating part 16, a heating box (heating plate) 4, a pressure belt 6, a pressure part 17, and the like. Conveyor belt 1
8, a pressure belt 6, a pressure unit 19 and the like. The pressing part 17 of the heating part 14
Is composed of a blower 21 serving as a supply source of compressed air, a supply pipe 22 of compressed air, an air chamber 5, and the like.
, A pressing force required for bonding the single-faced cardboard sheet 1 and the liner 3 is generated. The pressing force is uniform,
Further, the strength of the single-faced corrugated cardboard sheet 1 is required not to crush the corrugated top. Next, the operation of the double facer according to the above configuration will be described. After passing through the gluing machine 20,
The liner 3 preheated and conditioned by the preheating unit 16 includes a heating box (heating plate) 4 disposed below and appropriately heated by steam, and an endless pressure belt wound around from above. 6 is carried into the middle part.
Further, the single-faced cardboard sheet 1 made by the single facer of the previous step is carried into the intermediate portion from the other path with an adhesive 2 applied to the top of the single-faced cardboard sheet.
, Liner 3 and pressure belt 6 and heating box 4
The sheet is conveyed while being sandwiched between the sheets, and is bonded together under the action of moderate heating and pressing force to form a double-faced cardboard sheet 7. The cooling part 15 is a part for cooling the double-faced corrugated cardboard sheet 7 formed by the heating part 14. The cooling part 15 is formed by the pressure belt 6 running on the upper part and the transport belt 18 moving on the lower part.
, And conveyed with an appropriate pressing force applied by the pressing unit 19. By passing through the cooling part 15, the bonding state of the single-sided corrugated cardboard sheet 1 and the liner 3 bonded by the heating part 14 is further ensured, and the function of correcting distortion, warpage, and the like caused by cooling is achieved. The heating part 14 of the double facer
The width of the single-sided corrugated cardboard sheet 1 and the liner 3 to be carried into the container is varied from the maximum width to the minimum width in order to make it the standard width that can be most economically shaped as the material of the corrugated cardboard box created in the next process. There is a thing of the size. For this reason,
The heating part 14 has an optimal level of heating and a uniform pressing force in the width direction on the single-sided 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. 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 cardboard sheet 7 to be formed. And is provided so as to directly contact the upper surface of the pressure belt 6. Therefore, the following is pointed out as a problem that needs to be solved. In order to produce a double-sided corrugated cardboard sheet 7 having a width smaller than the width of the fixed wall of the air chamber 5,
As shown in FIG. 5 (a), since air pressure acts also on the area where the double-sided corrugated cardboard sheet 7 does not exist in the lateral width direction via the pressure belt 6, both side ends of the corrugated cardboard sheet are larger than the central part. Pressure is applied, and both ends are crushed. [0010] As shown in FIG.
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 the leakage of air from the air chamber 5 increases. For this reason, it is difficult to generate a uniform pressing force in the width direction, and it is not possible to maintain the air pressure at an appropriate level. It was impossible to improve the performance. An object of the present invention is to produce a high-quality double-faced corrugated cardboard sheet having good flatness without crushing both side edges of the double-faced corrugated cardboard sheet, and by increasing the pressing force at the time of preparation. An object of the present invention is to provide a heating part of a double facer capable of improving the sheet forming speed, that is, significantly improving the productivity. The heating part of the double facer according to the present invention is a single-faced cardboard loaded into an intermediate portion thereof by a heating box 4 and a pressure belt 6 provided opposite the box. The sheet 1 and the liner 3 are conveyed while being sandwiched, and a pressing force by compressed air in an air chamber 5 provided on an upper side surface of the pressure belt is used as a pressing means when the cardboard sheet and the liner are bonded. In the heating part of the double facer, a plurality of shaped steel members 8 slidably in contact with the upper surface of the pressure belt 6 at the bottom of the air chamber 5 and spanning in the width direction of the corrugated cardboard sheet are juxtaposed along the traveling direction of the corrugated cardboard sheet. In addition, while maintaining airtightness with the vicinity of the lower end portion of the air chamber 5 and allowing a certain degree of freedom in the vertical direction, the air chamber 5 is joined. An air pressure is applied to the pressure belt 6 via the group of steel bars 8 forming the bottom surface to generate a pressing force. According to the above construction, 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 a group of shaped steel members 8 arranged in parallel with the bottom of the air chamber 5 in sliding contact with the upper surface of the pressure belt 6. As a result, the variation in the surface pressure in the width direction of the corrugated cardboard sheet was reduced, and the bending deformation at the end in the width direction of the pressure belt 6 could be suppressed. As a result, the problem that both ends of the corrugated cardboard sheet are crushed has been solved, and the airtightness of the lower end of the side wall of the air chamber 5 has been improved, so that air leakage is reduced and the pressure of the compressed air is increased. Can be set. Therefore, the laminating performance of the corrugated cardboard sheet has been improved, and the productivity has been greatly improved. 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.
1B 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 line II-II in FIG. In these figures, reference numerals 1 to 7 and 21 and 22 are used.
The names of the elements indicated by are the same as in the case of the conventional example shown in FIGS.
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 cardboard sheet, 21 is a blower, and 22 is an air supply pipe. Elements indicated by reference numerals 8 to 13 are elements applied to the first embodiment of the present invention, 8 is a section steel, 9 is a rubber plate, 10
And 11 are rubber sheets, 12 is pins, and 13 is a perforated plate. Next, FIGS. 1 (a) and 1 (b) and FIGS.
The configuration and operation of the first embodiment will be described with reference to FIG. Adhesive 2 is applied to the top of the single-faced corrugated cardboard sheet 1 made with a single facer (not shown) in the process preceding the double facer, and is overlapped with the liner 3 sent through another path. The heating box (heating plate) 4 disposed in the air chamber 5 and the compressed air supplied into the air chamber 5 are conveyed into the middle of the pressurizing belt 6 which is pressurized from the upper surface via the group of shaped steel members 8 by a suitable amount. The two-sided corrugated cardboard sheet 7 is created by being conveyed while nipping while applying the heat and the pressing force. In the manufacturing process, in the conventional example, the upper surface of the pressing belt 6 was directly pressed by the compressed air in the air chamber 5, but in the embodiment, the pressing belt 6 The feature is that the pressure is pressed. As shown in FIGS. 1 (a) and 1 (b), a plurality of shaped steel members 8 are placed on the bottom of the air chamber 5 and slidably contact the upper surface of the pressure belt 6 in the width direction of the corrugated cardboard sheet. And are arranged side by side in the traveling direction of the cardboard sheet. As shown in FIG. 2A, in order to prevent air from leaking from the inside of the air chamber 5, a gap formed between adjacent shaped steel members 8 is sealed with a rubber plate 9 and The gap between the lower end of the air chamber 5 to be engaged and the shape steel 8 is also sealed with a sealing material such as rubber sheets 10 and 11. As the section steel 8, for example, a section steel (channel), an I-section steel or the like is used. As shown in FIG. 2 (b), the pin 12 projecting from the air chamber 5 is
To prevent the shaped steel 8 from moving in the running direction of the belt 6 and to allow the air chamber 5 to move only in the vertical direction. Have a degree of freedom within. Note that FIG.
(C) shows the method of engaging the air chamber 5 and the section steel 8 with the pin 1
2 is a cross-sectional view taken along the line II-II in FIG. 1 and a side view of the portion in a second embodiment using two of the two. The operation in this configuration is the same as in the case of FIG. With the above structure, all the pressure of the compressed air sent into the air chamber 5 acts on the pressure belt 6 indirectly via the group of shaped steel members 8 forming the bottom of the air chamber 5. That is, the bending deformation of the lateral end of the pressing belt in the width direction, which is a problem in the conventional method in which the pressing belt 6 directly acts on the upper surface, is suppressed. This solves the problem that the top of the corrugated cardboard is crushed at both ends of the width of the single-faced corrugated cardboard sheet 1, so that a high-quality double-faced corrugated cardboard sheet 7 having good flatness can be produced. FIG. 3 is a comparison diagram of the measurement results of the working surface pressure with respect to the position in the width direction (longitudinal direction of the section steel) of the double-faced corrugated cardboard sheet 7 for both the heating part of the embodiment and the conventional heating part. Compared with the conventional method in which air pressure is directly applied to the pressure belt 6, the embodiment in which the pressure belt 6 is indirectly pressurized via the group of shaped steels 8 has a smaller variation in the operating surface pressure. You can see that it is. Further, since the lower end of the air chamber 5 is configured to engage with the rigid shaped steel member 8, the airtightness against air leakage can be greatly improved, and the air pressure inside the air chamber 5 can be reduced. Since it can be set high, the pressing time required for laminating the single-sided corrugated cardboard sheet 1 and the liner 3 can be reduced, and the transport speed of the corrugated cardboard sheet 7 to be produced, that is, the productivity is improved. be able to. The heating part of the double facer according to the present invention is constructed and operated as described above. The shape of the section steel 8 and the method of sealing the lower end of the air chamber 5 are described with reference to the illustrated channel steel and I-section steel. In addition, it is possible to use a thin steel sheet press molded product, a synthetic resin molded product, etc., and to apply a synthetic resin as a sealing material,
It is also possible to use a sealing method using a brush. The heating part of the double facer according to the present invention employs an indirect pressing method through a plurality of shaped steel members 8 arranged in parallel in the direction of travel of the corrugated cardboard sheet. , The fluctuation of the working surface pressure generated at both ends of the pressing belt 6 can be reduced. That is,
Bending deformation of the lateral end of the pressure belt 6 in the width direction can be suppressed, and the conventional problem that both ends of the corrugated cardboard sheet are crushed is solved. Further, since it is configured to engage with the group 8 of high rigidity, the airtightness of the lower end 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, it is possible to produce a high-quality double-faced corrugated cardboard sheet with good flatness without crushing both side edges of the double-faced corrugated cardboard sheet, and increase the production speed by increasing the pressing force at the time of production. Improvement, that is, a significant improvement in productivity.

BRIEF DESCRIPTION OF THE 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, wherein FIG.
FIG. 2B is a plan view. 2A is a detailed view of a portion A in FIG. 1A, and FIG. 2B is a cross-sectional view taken along the line II-II in FIG. 1A and a side view of the part. . FIG. 2C shows a second embodiment of the present invention.
FIG. 2A is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is a comparison diagram of the measurement results of the working surface pressure with respect to the position in the width direction of the double-faced corrugated cardboard sheet for both the heating part of the embodiment and the conventional heating part. 4A and 4B are explanatory diagrams of a configuration of a heating part of a conventional double facer, where FIG. 4A is a side view and FIG. 4B is a plan view. 5 (a) is an explanatory diagram of the occurrence of deformation of the pressure belt 6 in the heating part shown in FIG. 4, and FIG. 5 (b) is a detailed view of a portion S in FIG. FIG. 6 is an explanatory diagram of an entire configuration of a double facer in the corrugating machine. [Explanation of Signs] 1: Single-sided corrugated cardboard sheet, 2: Adhesive, 3: Liner, 4
... Heating box (heating plate), 5 ... Air chamber, 6 ... Pressing belt, 7 ... Double-sided cardboard sheet, 8 ... Shape steel, 9 ... Rubber plate, 10 ... Rubber sheet, 11 ... Rubber sheet, 12 ... Pin, 13 ... perforated plate, 14 ... heating part, 15 ... cooling part, 16 ... preheating part,
17 ... Pressure unit, 18 ... Conveyer belt, 19 ... Pressure unit, 20
... Gluing machine, 21 ... Blower, 22 ... Air supply pipe.

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Claims (1)

(1) A single-faced corrugated cardboard sheet (1) carried into an intermediate portion thereof by a heating box (4) and a pressure belt (6) provided to face the box. The liner (3) is pinched and conveyed, and a pressing force by compressed air in an air chamber (5) disposed on an upper surface of the pressure belt is used as a pressing means when the corrugated cardboard sheet and the liner are bonded. In the heating part of the double facer, a plurality of shaped steel members (8) slidably contacting the upper surface of the pressure belt (6) with the bottom of the air chamber (5) and extending in the width direction of the corrugated cardboard sheet are moved in the traveling direction of the corrugated cardboard sheet. And is joined to the periphery of the lower end of the air chamber while maintaining airtightness and allowing a certain degree of freedom in the up-down direction to form the bottom of the air pressure in the air chamber (5). Kikatachiko (8) heating part of the double facer, characterized in that to generate a pressing force is added to the pressure belt (6) through the group.