JP5157569B2 - Sheet end folding method and sheet end folding apparatus - Google Patents

Description

  The present invention relates to a method of folding an end of a sheet material and a sheet end folding device used for embodying the same, and in particular, to protect a paper end surface of a beverage paper container from a liquid in a content. It is related with the sheet | seat edge part folding apparatus used suitably for the use which folds the film of this.

Conventionally, as a sheet end portion folding device for folding an end portion of a sheet material, devices having various structures and forms have been used, and these are roughly classified into two types. One is a device that continuously folds the end portion of the material that runs continuously, and one is a device that turns the end portion of the material that runs intermittently, once stopped.
When the blank shape is a fan shape, such as a paper cup in a beverage paper container, the end portions that need to be folded back are not necessarily aligned, so that continuous processing is difficult and intermittent. It must be a simple process.

  For this reason, conventionally, as shown in FIG. 8, the folded portion 2 of the sheet material 1 placed on the support base 3 is bent downward by the half-moon plate 20 attached to the plate 21, and then as shown in FIG. The half-moon plate 20 was rotated by 90 °, and the folded portion 2 of the sheet material 1 was sandwiched between the plate edge 22 and pressed. However, in this apparatus, when the sheet is folded, the sheet protruding from the plate edge is sandwiched between the half-moon plates, causing a folding failure or folding a portion of paper that is not originally folded. Further, since the surface is crimped by the plate, the crimping force is not sufficient, and adhesion failure of the folded portion may occur. In addition, there is a problem that the tolerance for the positional deviation of the sheet material is low, and even if there is a slight positional deviation, it leads to a deviation of the folding position, so that quality variations are likely to occur.

  In order to solve the problem of the half-moon plate folding device, the inventor previously proposed a sheet end folding device described in Patent Document 1. The feature of this apparatus is that the sheet end is bent at a right angle by the edge of the lifting / lowering table and the sheet folding plate, and then the lifting / lowering table is retracted downward and the sheet folding plate is swung by the parallel swing arm. Although the end portion is folded back and stable folding operation can be expected, the surface crimping method remains unchanged, and the problem of poor adhesion due to insufficient crimping force still remains.

Similarly, the device described in Patent Document 2 proposed by the inventor is also a surface pressure bonding method, and thus the problem of insufficient pressure bonding force could not be solved.
JP 2006-56692 JP JP 2006-62284 A

  SUMMARY OF THE INVENTION In view of the above-described conventional problems, the present invention embodies a sheet end folding method capable of obtaining a stable folding operation and sufficient adhesive force when folding a sheet end used in a beverage paper container. An object of the present invention is to propose a sheet end folding device.

As means for solving the above-mentioned problems, the invention according to claim 1 is based on an end portion of the base sheet of a sheet material in which a base sheet not softened by preheating and a film softened by preheating are bonded together. A method of folding the protruding film , wherein the sheet material is placed on a horizontal support base, an end including the folded portion of the sheet material is protruded outside the support base, and the base portion of the sheet material is a support base. It is fixed by sandwiching it at the rear end of the crimping plate, preheating the folded part, lowering the rotatable roll from above, bending the folded part downward, and then moving the roll horizontally toward the crimping plate Then, the folded portion bent downward is folded back horizontally, and is crimped and bonded between the roll and the tip of the crimping plate. A folding method over preparative end.

The invention according to claim 2 is an apparatus for turning back the film that protrudes from the end of the base sheet of a sheet material in which a base sheet that is not softened by preheating and a film that is softened by preheating are bonded together. And a support base on which the sheet material is placed, a pressure-bonding plate, a rotatable roll, a roll moving means for moving the roll in the vertical direction and the horizontal direction, and a preheating device , The base of the sheet material placed on the support base is sandwiched between and fixed to the support base, and the roll descends from above by the roll moving means and is preheated of the sheet material. After folding the folded part of the end downward, it moves horizontally and folds the folded part horizontally, and is crimped between the tip part of the crimping plate and bonded. Sheet edge to be folded device.

  According to a third aspect of the present invention, the pressure-bonding plate 4 and the roll 5 are attached to a lower slider 7 that moves up and down along a vertical fixed shaft 6, and the lower slider is above it. It is suspended by a rod 9 that is pivotally attached to an upper slider 8 that moves up and down along the fixed axis. As the upper slider descends, the lower slider descends and stops by a stopper 10. The sheet material placed on the support 3 is fixed by the rear end portion of the pressure-bonding plate, the folded portion of the sheet material is bent downward by the roll, and then the upper slider is further lowered, whereby the upper slider The rod attached to the shaft is pushed downward, and is attached to the other end of the rod and fixed to the lower slider. The roll moves horizontally in the direction of the crimping plate through a lever 13 that can rotate around the point 11, thereby folding back the folded portion of the sheet material horizontally, and the roll and the tip of the crimping plate, The sheet end folding device according to claim 2, wherein the sheet end folding device is bonded by being sandwiched between the two.

  According to the sheet edge folding method according to the present invention, the sheet material is placed on a horizontal support base, the end including the folded portion of the sheet material is projected out of the support base, and the base portion of the sheet material is supported. Since the base and the rear end of the crimping plate are sandwiched and fixed, occurrence of folding failure due to escape of the sheet material can be prevented. In addition, the result of adopting a method in which the rotatable roll is lowered from above and folded by pushing the folded portion downward, then the roll is moved horizontally in the direction of the crimping plate, and the folded portion folded downward is horizontally folded. Unlike the conventional method of bending with a rigid and constant-shaped object like a half moon bar, the sheet material is squeezed with the cylindrical surface of a rotatable roll, so the tolerance for the positional accuracy of the sheet material Even if the position of the sheet material varies slightly, a stable folding operation can be performed. In addition, since the folded portion at the tip of the sheet material is sandwiched between the roll and the tip of the crimping plate and bonded and bonded, it is sufficient for crimping by linear pressure compared to conventional surface crimping. A crimping force is obtained, and there is an effect of preventing the occurrence of adhesion failure.

  In addition, the apparatus for folding the end of the sheet material has a support base on which the sheet material is placed, a pressure plate, a rotatable roll, and a roll moving means for moving the roll in the vertical direction and the horizontal direction. The crimping plate is lowered from above, the rear end portion is fixed with the base portion of the sheet material placed on the support stand between the support stand, and the roll is lowered from above by the roll moving means. After folding the folded part at the end of the sheet material downward, it moved horizontally and folded the folded part horizontally, and it was sandwiched between the tip part of the crimping plate and adhered, and a mechanism to adhere was adopted. The folding method of the sheet end can be realized as it is, and sufficient folding force and stable folding can be expected when folding the sheet end.

  The crimping plate and the roll are attached to a lower slider that moves up and down along a vertical fixed axis, and the lower slider is mounted on the upper slider that moves up and down along the fixed axis. As the upper slider is lowered, the lower slider is lowered and stopped by the stopper, so that the sheet material is fixed by the crimping plate and the folded portion of the sheet material is lowered by the roll. Then, the upper slider is further lowered, so that the rod rod pivotally attached to the upper slider is pushed downward, is pivotally attached to the other end of the rod, and is centered on a fulcrum fixed to the lower slider. A mechanism that moves the roll horizontally in the direction of the crimping plate via a rotatable lever When use is because all operations are effected by only vertical movement of the upper slider mechanism is simple, therefore the failure is small and there is an effect that stable operation can be obtained. In addition, since hydraulic equipment, air cylinders, and electrical components are minimized, the cost of the apparatus is reduced.

With reference to the drawings, the sheet edge folding method according to the present invention will be described in detail.
1-3 is explanatory drawing of the folding | turning method of the sheet | seat edge part which concerns on this invention.
In FIG. 1, the roll 5 provided at the tip of the crimping plate 4 and the shaft 16 is lowered from above the folded portion 2 of the sheet material 1 placed on the support base 3, and as shown in FIG. The base portion is sandwiched and fixed by the support base 3 and the rear end portion 4a of the crimping plate 4, and the folded portion 2 is pushed downward by the roll 5 and bent. At this time, the folded portion 2 is preferably preheated with hot air or a heater immediately before it is made flexible.

  Next, as shown in FIG. 3, the shaft 16 is advanced, the roll 5 attached to the tip of the shaft is moved horizontally in the direction of the crimping plate 4, and the folded portion 2 folded downward is folded horizontally. Then, the sheet is sandwiched between the roll 5 and the tip 4b of the pressure-bonding plate 4 and bonded. Since the roll 5 is rotatably attached to the tip of the shaft 16, a series of operations are smoothly performed.

  Here, the base portion of the sheet material is a generic term for a portion other than the end portion of the sheet material that protrudes from the support base 3, but the fixing by the crimping plate 4 does not necessarily require the entire base portion of the sheet material. There is no need to fix, and it is often sufficient to fix a portion of the base.

  FIG. 6 is an enlarged cross-sectional explanatory view of the folded portion of the sheet end portion, and shows a state before folding. In the sheet material 1, the film 1a and the base material sheet 1b are bonded together, and the film protrudes from the base material sheet. This overhanging portion becomes the folded portion 2. FIG. 7 is an enlarged cross-sectional explanatory view of the folded portion of the sheet end portion, and shows a state after folding. The folded portion 2 of the sheet end is folded and adhered to the back surface of the base sheet 1b, and the film functions to protect the end face of the base sheet.

  In the case of a paper beverage container, the base material sheet 1b is usually made of paper or paper, aluminum foil, a thermoplastic resin film or the like, and the film 1a is a polyolefin resin film, a polyamide resin film, A thermoplastic resin film such as a polyester resin film is used. Therefore, when the end portion of the sheet material is preheated with hot air or a heater, the thermoplastic resin film in the folded portion is softened, but the base sheet is not softened, and the folding operation is performed smoothly.

FIG. 4 is an overall view showing an example of a sheet end folding apparatus according to the present invention, and FIG. 5 is an explanatory view showing a cross section AA of FIG.
The apparatus is held by two fixed shafts 6 fixed to a fixed table 17. A drive shaft 19 located at the center of the two fixed shafts 6 is fixed to the lift table 18, and the vertical movement of the lift table 18 is directly transmitted to the upper slider 8 by the drive shaft 19. The upper slider 8 moves up and down along the two fixed shafts 6 as the drive shaft 19 moves up and down.

  The lower slider 7 is suspended from the upper slider 8 by a rod 9, the upper end of the rod 9 is pivotally attached to the upper slider 8, and the rod end A (12) as the lower end is fixed to the lower slider 7. Further, it is pivotally attached to one end of a lever 13 that can rotate around the fulcrum 11. The rod end B (14) of the rod B (15) is pivotally attached to the other end of the lever 11, and the tip of the rod B (15) is pivotally attached to the shaft 16 that holds the roll 4.

A crimping plate 4 is fixed to the lower slider 7. The horizontal position and height of the crimping plate can be adjusted. In addition, since the length of the rod 9 and rod B (15), the length of the shaft 16 and the like described above can be adjusted, the optimum positional relationship in accordance with the shape and thickness of the target sheet material. Adjust to use.
The distance between the upper slider 8 and the lower slider 7 is normally kept open by a spring 23.

  When the elevating table 18 is now lowered, the operation is transmitted to the upper slider 8 via the drive shaft 19 and the upper slider 8 is lowered. The lower slider 7 suspended by the rod 9 on the upper slider 8 is lowered integrally with the upper slider 8 until it hits the stopper 10 by its own weight and the repulsive force of the spring 23, but when it hits the stopper 10 Stop at. At this time, the base portion of the sheet material 1 placed on the support table 3 is sandwiched and fixed between the crimping plate 4 and the support table 3. At the same time, the folded portion 2 of the sheet material 1 is folded downward by the roll 4. Next, when the upper slider 8 is further lowered, the spring 23 is compressed and the rod 9 is pushed downward. When the rod 9 is pushed downward, the lever 13 rotates through the rod end A (12), and the rod B (15) is pushed out horizontally through the rod end B (14). As a result, the roll 4 attached to the tip of the shaft 16 moves in the horizontal direction, and the folded portion 2 of the sheet material 1 is folded in the horizontal direction, and simultaneously crimped with the crimping plate 4. Next, the lift table 18 is raised, the roll 4 returns to the original position, the lower slider 7 is raised, and the series of operations is completed.

Since these series of operations occur only from the up-and-down operation of the lifting table 18, the entire mechanism is simplified, and therefore, the occurrence of failure is reduced and stable folding work can be performed.
There is no particular limitation on the mechanism that generates the vertical movement of the elevating table 18, and a mechanical method such as a rack / pinion mechanism, a ball screw, or a link mechanism, or a method using a hydraulic cylinder or an air cylinder may be used. A method combining these can be arbitrarily selected. As for the vertical movement speed of the lifting table, a constant speed is usually sufficient, but the speed may be changed during a series of operations. For example, the speed may be decreased only when the roll 4 moves in the horizontal direction so that fine adjustment such as sufficient pressure bonding of the folded film portion may be performed.

The above is one example of the sheet folding apparatus according to the present invention, and is not necessarily limited to these mechanisms. For example, the vertical movement of the crimping plate 4 and the horizontal movement of the roll 4 may be driven by an air cylinder. When an air cylinder is used, each operating speed can be set independently, so fine adjustments are possible, but on the other hand, there are many electromagnetic valves, relays, limit switches, etc. for turning the air cylinder on and off. Electrical components are required, increasing the overall cost of the device. Also, when the air pressure drops for some reason, malfunction may occur, or it may seem that it is operating normally at first glance, but there may be insufficient adhesion due to poor crimping. .
On the other hand, when the sheet folding apparatus is configured only by a mechanical mechanism, the operation is stable for a long period of time, and a stable folding operation is possible.

Explanatory drawing (1) of the folding | closing method of the sheet | seat edge part which concerns on this invention Explanatory drawing (2) of the folding | closing method of the sheet | seat edge part which concerns on this invention Explanatory drawing (3) of the sheet | seat edge part folding method which concerns on this invention Overall view showing an example of a sheet edge folding device according to the present invention Explanatory drawing which shows AA cross section of the sheet | seat edge part folding | turning apparatus shown in FIG. Cross-sectional explanatory drawing enlarging the folded part of the sheet edge (state before folding) Cross-sectional explanatory drawing enlarging the folded part of the sheet edge (state after folding) Explanatory drawing of sheet folding operation in a conventional sheet folding apparatus (1) Explanatory drawing of sheet folding operation in a conventional sheet folding apparatus (2)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Sheet material 1a ... Film 1b ... Base material sheet 2 ... Folded part 3 ... Support base 4 ... Crimping plate 4a ... Rear end of crimping plate 4b: tip 5 of the crimping plate 5 ... roll 6 ... fixed shaft 7 ... lower slider 8 ... upper slider 9 ... rod 10 ... stopper 11 ...・ Support point 12 ... Rod end A
13 ... Lever 14 ... Rod end B
15 ... Rod B
16 ... Shaft 17 ... Fixed table 18 ... Lifting table 19 ... Drive shaft 20 ... Meniscus plate 21 ... Plate 22 ... Plate edge 23 ... Spring

Claims (3)

A sheet material in which a base material sheet that is not softened by preheating and a film that is softened by preheating is bonded, the film protruding from the end of the base material sheet is folded back, and the sheet material is placed on a horizontal support. Placing and protruding the end including the folded portion of the sheet material out of the support base, fixing the base portion of the sheet material between the support base and the rear end portion of the crimping plate, and preheating the folded portion, Lower the rotatable roll from above and push the folded part downward to bend it, then move the roll horizontally in the direction of the crimping plate, fold the folded part folded down downward horizontally, A method for folding a sheet edge, wherein the sheet is crimped between and bonded to the leading edge. A device for folding back the film protruding from the end of the base material sheet of a sheet material in which a base material sheet that is not softened by preheating and a film that is softened by preheating are bonded together, and on which the sheet material is placed A pressure plate, a rotatable roll, a roll moving means for moving the roll in the vertical direction and the horizontal direction, and a preheating device , the pressure plate is lowered from above, and the rear end portion is a support base. After the base portion of the sheet material placed on the base plate is sandwiched between and fixed to the support base, the roll descends from above by the roll moving means and the folded portion of the end portion of the sheet material preheated is folded downward A sheet end folding device that moves horizontally and folds the folded portion horizontally, and crimps and bonds the folded portion with the tip of the crimping plate.   The crimping plate (4) and the roll (5) are attached to a lower slider (7) that moves up and down along a vertical fixed shaft (6), and the lower slider is above the fixed shaft. It is suspended by a rod (9) pivotally mounted on an upper slider (8) that moves up and down along the upper slider, and as the upper slider is lowered, the lower slider is lowered and stopped by a stopper (10). Accordingly, the sheet material placed on the support base (3) is fixed by the rear end portion of the crimping plate, the folded portion of the sheet material is folded downward by the roll, and then the upper slider is further lowered. As a result, the rod pivotally attached to the upper slider is pushed downward, and is pivotally attached to the other end of the rod and fixed to the lower slider. The roll moves horizontally in the direction of the crimping plate via a lever (13) that can rotate around a fulcrum (11), so that the folded portion of the sheet material is folded back horizontally, and the roll and the crimping plate The sheet end folding device according to claim 2, wherein the sheet end folding device is sandwiched between the front end portion of the sheet and bonded together.

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