JPH0593827U - Double facer - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] It is possible to manufacture high-quality double-faced corrugated sheet without warp deformation. [Composition] Preheating roll 2 for heating part 6
The liner sheet 1 to be supplied is preheated and tempered by a and 2b and conveyed to the heating box 8a which is heated by steam, while the single-sided corrugated sheet 4 is passed through the glueing machine 13 to the heating box 8a.
The liner sheet 1 and the single-sided corrugated sheet 4 are conveyed to a.
And the seats 1 and 4 are heated by the weight roll and the canvas belt.
Press in the directions of b and 8c, and press each other on one side of the corrugated sheet 4
The double-faced corrugated board sheet 5 is manufactured by pasting it with the glue 14 attached to the top of the corrugated sheet.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a double facer installed on a corrugated machine.

[0002]

[Prior Art]

 The conventional double facer will be described with reference to FIG. 3. The double facer is composed of a heating part 6 and a cooling part 7 in the next process, and the single-faced corrugated board sheet 4 and the liner sheet 1 made by the single process facer in the previous process are bonded together. By doing so, the double-sided corrugated board sheet 5 is manufactured.

The heating part 6 includes a preheat roll 2, a heating box (hot plate) 8, a canvas belt 9, and a pressing unit 10. Explaining the functions of the above parts, the preheat roll 2 of the heating part 6 preheats and tempers the liner sheet 1 supplied through the glueing machine 13 and conveys it to the heating box 8. It is a thing.

The heating box 8 is heated by steam, and has an appropriate heating condition necessary for promoting the bonding between the liner sheet 1 that slides on the upper surface of the heating box 8 and the single-sided corrugated cardboard sheet 4. Is to maintain. The canvas belt 9 is located above the double-sided corrugated board sheet 5, and holds the liner sheet 1 and the single-sided corrugated board sheet 4 between the heating box 8 and the carousel belt 5 and runs along with these sheets 1 and 5 ( These sheets 1 and 5 are conveyed) and have a function of dispersing the pressing force in manufacturing corrugated board sheets to some extent in the width direction.

The heating section 10 is a section for applying a pressing force necessary for bonding the corrugated board via the canvas belt 9. The cooling part 7 in the next step is a cooling unit for the double-sided corrugated board sheet 5, and holds the double-sided corrugated board sheet 5 between the upper and lower belts 9 and 11, and a proper pressing force is applied by the pressing unit (wait roll) 12. The liner sheet 1 and the single-faced corrugated sheet 4 that have already been bonded are cooled while being conveyed to the downstream side, and the sheets 1 and 4 are pressed so that the bonding is more reliable, and both sides during cooling. It has a function of correcting the warp deformation of the corrugated board sheet 5 to some extent.

The glue 14 is transferred and supplied by the glueing machine 13 to the step top portion of the single-sided corrugated board sheet 4, and the liner sheet 1 and the single-sided corrugated board sheet 4 are bonded by the glue 14. In that case, appropriate heating and pressing force are required. This pressing force is required to be uniform in the entire widthwise direction of the sheet and not to crush the step top portion of the single-faced cardboard sheet 4. At that time, it is required that wrinkles and slack are not generated on the surfaces of the sheets to be laminated.

Therefore, various types of pressurizing devices have been conventionally proposed. FIG. 7 shows a typical example of this, which uses a weight roll. This pressurizing device pressurizes the liner sheet 1 and the single-sided corrugated board sheet 4 through a plurality of weight rolls 15 (10 and 12) and the canvas belt 9 to bond the sheets 1 and 4 together.

[0008]

[Problems to be solved by the device]

 In the conventional double facer shown in FIG. 3, the liner sheet 1 and the single-faced corrugated fiberboard sheet 4 manufactured by the single facer in the previous step are bonded to each other to manufacture the double-faced corrugated fiberboard sheet 5. After bonding, The relative shrinkage amounts of the sheets 1 and 4 have variations, and due to this variation, the double-faced corrugated board sheet 5 is warped as shown in FIG. That is, the shrinkage amount S of the single-sided corrugated sheet 4 side₁Is large (S ₁ > S₂), There is an upward warp, and conversely, the shrinkage amount S on the side of the liner sheet 1₂ Is large (S₁<S₂) Will be a warp.

FIG. 5 shows the relationship between the moisture content%, the shrinkage amount m / m, the paper temperature C, and the heating elapsed time t (sec). The moisture content% and the shrinkage amount m / m tend to decrease with the heating elapsed time t. According to the above tendency, if the time to reach the heating part 6 after the heating of the liner sheet 1 is appropriately adjusted and the conditions such as the moisture content are controlled, the shrinkage amounts of the sheets 1 and 4 to be bonded are balanced. It is possible.

However, since the conventional liner sheet 1 goes to the heating part 6 through the guide roll 3 provided at a fixed position as shown in FIG. 6, as the manufacturing speed becomes faster, the preheater sheet 1 is preheated. The transit time from the roll 2 to the heating part 6 is shortened. FIG. 7 shows the relationship between the passing time T (sec), the seat speed V (m / sec) and the passing distance.

That is, since the path distance of the liner sheet 1 is always constant, the passage time changes significantly due to the acceleration and deceleration of the liner sheet 1, and the conditions such as the water content change. Therefore, there is a problem that after the liner sheet 1 and the single-sided corrugated board sheet 4 are bonded together, an imbalance occurs in the relative shrinkage amount between the sheets 1 and 4, and the double-faced corrugated board sheet 5 is warped and deformed. It was

The present invention is proposed in view of the above problems, and an object thereof is to provide a double facer capable of manufacturing a high-quality double-faced corrugated board sheet without warp deformation.

[0013]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a guide roller for guiding a liner which is located in the middle of a preheat roll for heating and conditioning the liner and a double facer introduction portion in a double facer installed in a corrugated machine. The liner is supported so that it can move in the direction orthogonal to the axial direction, and the line length of the liner can be changed according to the condition of the single-faced corrugated sheet and the traveling speed of the sheet.

[0014]

[Action]

 The double facer of the present invention is constructed as described above, and the preheat roll of the heating part preheats and tempers the supplied liner sheet and conveys it to the heating box heated by steam. On the other hand, the single-sided corrugated board sheet is conveyed to the heating box through the glueing machine, the liner sheet and the single-sided corrugated board sheet are merged, and the above-mentioned sheets are applied in the direction of the heating box by the weight roll and the canvas belt. Press to bond them to each other with the glue attached to the corrugated top of the single-sided corrugated board sheet to manufacture a double-sided corrugated sheet. When increasing the production speed of double-faced corrugated sheet, the guide roll is retracted to increase the path length from the preheat roll to the double facer introduction section, and conversely, the production speed of double-faced corrugated sheet is reduced. In this case, the guide roll is moved forward to shorten the path length from the preheat roll to the double facer introduction part, which controls the elapsed time after passing through the preheat roll to the double facer introduction part. Match the temperature and moisture content of the sheet with the temperature and moisture content of the single-sided corrugated board sheet to prevent warp deformation of the double-sided ball sheet after lamination.

[0015]

【Example】

 Next, the double facer of the present invention will be described with reference to an embodiment shown in FIG. 1. Reference numeral 1 is a liner sheet, 2a and 2b are preheat rolls for heating and conditioning the liner sheet 1, and 3 is a guide roll for guiding the liner sheet 1. The guide roll 3 is located between the preheat rolls 2a and 2b and the double facer introducing portion, and is supported so as to be movable in a direction orthogonal to the axial direction (see arrow).

Reference numeral 4 is a single-sided corrugated board sheet, 5 is a double-sided corrugated board sheet, 8a, 8b and 8c are heating boxes (hot plates), 13 is a glueing machine, and 14 is a glue. Next, the operation of the double facer shown in FIG. 1 will be specifically described. The preheat rolls 2a and 2b of the heating part 6 preheat and condition the liner sheet 1 supplied, and convey the liner sheet 1 toward the heating box 8a heated by steam, while the single-sided corrugated sheet 4 is glued. The liner sheet 1 and the single-sided ball sheet 4 are merged by being conveyed to the heating box 8a through the in-machine 13.

At this time, the weight rolls (see 10 in FIG. 3) and the canvas belt (see 9 in FIG. 3) press the sheets 1 and 4 toward the heating boxes 8a, 8b and 8c, The two-sided corrugated board sheet 5 is manufactured by pasting each other through the paste 14 attached to the top of the one-sided corrugated board sheet 4. In order to increase the production speed of the double-faced corrugated board sheet 5, the guide roll 3 is moved in the C → B direction to lengthen the path length from the preheat roll 2b to the double facer introduction portion. When the production speed of the sheet 5 is slowed down, the guide roll 3 is moved in the B → C direction to shorten the path length from the preheat roll 2b to the double facer introduction portion.

With this, the time and moisture content of the liner sheet 1 are controlled to match the temperature and moisture content of the single-sided ball seat 4 by controlling the elapsed time from the passage of the preheat rolls 2a and 2b to the introduction portion of the double facer. To prevent the double-faced corrugated board sheet 5 from warping after being bonded. FIG. 2 shows the relationship between the passing time T (sec), the seat speed V (m / sec), and the passing distance.

[0019]

[Effect of the device]

 As mentioned above, the double facer of the present invention preheats and tempers the liner sheet supplied by the preheat roll of the heating part and conveys it to the heating box heated by steam, while it is single-sided corrugated board. The sheet is conveyed to the heating box through the glueing machine, the liner sheet and the single-sided corrugated sheet are merged, and each of the above sheets is pressed in the direction of the heating box by the weight roll and the canvas belt, and the sheets are pressed against each other. Is pasted through the glue attached to the top of the single-sided corrugated sheet to produce a double-sided corrugated sheet. When increasing the double-sided corrugated board production speed, the guide roll is retracted to lengthen the path length from the preheat roll to the double facer introduction section, and conversely, to decrease the double-sided corrugated board production speed. The guide roll is moved forward to shorten the path length from the preheat roll to the double facer introduction part, which controls the elapsed time from passing through the preheat roll to the double facer introduction part to control the liner sheet. By matching the temperature and moisture content to the temperature and moisture content of the single-sided corrugated board sheet to prevent the double-faced corrugated board after warping from warping, a high-quality double-faced corrugated board sheet without warp deformation can be manufactured.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a double facer of the present invention.

FIG. 2 is a passing time T (sec) and a seat speed V (m / s).
It is explanatory drawing which shows the relationship between ec) and passing distance.

FIG. 3 is a side view showing a conventional double facer.

FIG. 4 is an explanatory diagram showing warp deformation that occurs in a double-faced corrugated board sheet.

FIG. 5 is an explanatory diagram showing a relationship between a moisture content%, a shrinkage amount m / m, a paper temperature ° C, and a heating elapsed time t (sec).

FIG. 6 is a side view showing a sheet introducing portion of a conventional double facer.

FIG. 7: Passing time T (sec) and seat speed V (m / s)
It is explanatory drawing which shows the relationship between ec) and passing distance.

[Explanation of symbols]

 1 Liner Sheet 2a, 2b Preheat Roll 3 Guide Roll 4 Single-sided Corrugated Sheet 5 Double-sided Corrugated Sheet 8a, 8b, 8c Heating Box (Hot Plate) 13 Gluing Machine 14 Glue

Claims (1)

[Scope of utility model registration request] 1. In a double facer installed in a corrugating machine, a guide roll for guiding a liner running at a position intermediate between a preheat roll for heating and conditioning the liner and a double facer introduction portion is orthogonal to the axial direction. The double facer is configured so that it can be moved according to the state of a single-sided corrugated sheet to be attached to the liner, the traveling speed of the sheet, etc.