JPH058199A - Cutting device for manufacturing heating element - Google Patents

Abstract

PURPOSE:To provide the cutting device which can cut a contour of a heating element without making its size smaller than that of the conventional one and also can cut its corner so as to decrease waste of wrapping material, and in addition, can be attached easily to the conventional heating element manufacturing device. CONSTITUTION:This device consists of the die cylinder 6 which has the blades 5 on its outer periphery for cutting a sheet of heating element S, and the anvil cylinder 7 which rotates in the direction opposite to that of the die cylinder 6, and such a shape that plural corner cutting edges are formed by arranging the blades 5 in the axial and peripheral direction of the die cylinder 6 so that a part of the blades 5 corresponding to each sides of the corner cutting edges and the side of the respective neigbouring corner cutting edges are in common.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting device for producing a heating element (hereinafter simply referred to as a cutting device). More specifically, a sheet in which a plurality of heating elements filled with a heating composition are continuously formed (hereinafter simply referred to as a heating element sheet)
The present invention relates to a cutting device for cutting each heating element in a corner cut shape without wasting the packaging material.

[0002]

2. Description of the Related Art Conventionally, in a heating element manufacturing apparatus (hereinafter, simply referred to as a manufacturing apparatus) 41 as shown in FIG. 4, two packaging materials 42 supplied from separate rollers are attached to a sealing die roll (hereinafter, While forming a plurality of storage parts by continuously heat-sealing with a die roll) 43, a predetermined amount of the exothermic composition is filled from the hopper 44 into the storage parts, and the unheat-sealed part is filled after filling. It is heat sealed. Then, the heat-sealed portion of the heating element sheet thus formed is cut by the vertical cutting machine (slitter) 45 in the manufacturing apparatus 41 to separate the heat-sealed portions for each row. A plurality of sheets in which the heating elements are arranged in a row are cut by the horizontal cutting machine (cutter) 46 for each heating element.

The heating element thus formed has a quadrangular shape, and the corners of the four corners are very unpleasant because they stimulate the skin of the wearer. Therefore, a new process and new equipment are provided to cut and remove the four corners. As a result, the manufacturing cost of the heating element is high.

In order to solve the problem, recently, a cutting device has been provided which can simultaneously cut and remove the four corners at the same time when cutting each pack of heating elements.

As shown in FIG. 5, this cutting device 51 has a die having a blade 52 formed in a shape of a final heating element, in which four corners of a quadrangle are removed (hereinafter, simply referred to as a corner cutting angle). It is composed of a cylinder 53 and an anvil cylinder 54 for pressing the heat-sealed portion of the heating element together with the blade 52.

The die cylinder 53 and the anvil cylinder 54 are arranged to be in contact with each other and rotate in opposite directions.

On the outer peripheral surface of the die cylinder 53, a corner cutting edge
Numerals 52 are formed in the axial direction and the circumferential direction with a slight interval between them. And the corner 52
On the inner surface surrounded by, there is formed a substantially rectangular recess 55 which is slightly smaller than the corner angle. The recess 55 is a space for preventing the bag portion filled with the heat generating composition from being pinched when the heat generating sheet is cut. And anvil cylinder
Also in 54, a recess 56 of the same shape is formed so as to correspond to the recess 55 of the die cylinder 53.

The cutting device 51 pushes the heating element sheet S sent from the die roll into the final product shape by being sandwiched between the die cylinder 53 and the anvil cylinder 54. Under the cutting device 51, the cut-off corner heating elements are sent out one by one, while the heating elements are cut out and the remaining portion R of the packaging material W in the form of a large net is continuously output. Come on.

[0009]

[Problems to be Solved by the Invention] The conventional cutting device 51 described above.
However, since the adjacent corner-cutting blades 52 are spaced apart from each other, the remaining portion R (the net-like one) of the packaging material is produced after the heating element is manufactured, which is wasted. Furthermore, if the slitter 45 and the cutter 46 are used in place of the slitter 45 and the cutter 46, which have been widely used in the related art, the vertical and horizontal cutting-type manufacturing apparatus 41 (see FIG. 4) will be inconvenient.
That is, since there is a space between the blades, the resulting heating element has a size of the entire heating element and a size of the bag portion filled with the heating composition which are manufactured by a conventional manufacturing apparatus (see FIG. 4). Since it is smaller than the heating element, it has lower heat generation performance than conventional products. In order to make it the same size as the conventional product, it is necessary to enlarge the entire die roll, and as a result,
In addition to widening the packaging material, other components of the manufacturing equipment (such as die roll support and heating composition supply hopper)
The design may be changed.

The present invention has been made in order to solve the above-mentioned problems, and the conventional die roll is used as it is, without wasting the packaging material and when it is diverted to the conventional manufacturing apparatus. An object of the present invention is to provide a cutting device capable of cutting into the same size as the body.

[0011]

DISCLOSURE OF THE INVENTION A cutting device for producing a heating element according to the present invention comprises a die cylinder provided with a blade for cutting a sheet of the heating element on an outer peripheral surface thereof, and an anvil facing the die cylinder in parallel to an axial direction. A cylinder, the cylinders are supported by a machine frame so that they can rotate in opposite directions, and the blade has a plurality of corner cut corners that are continuously provided in the axial direction and the circumferential direction of the die cylinder. And the blade portions corresponding to the respective sides of the corner cutting angle are shared with the sides of the adjacent corner cutting angles.

At least one of a rectangular area inside each corner cutting angle defined by the blade and slightly smaller than the corner cutting angle or an outer peripheral surface of the anvil cylinder corresponding to the area is formed as a recess. Is preferred.

Further, a substantially cruciform star-shaped space is defined by abutting the corners of the four adjacent corner-cut corner blades, and the outer peripheral surface of the anvil cylinder corresponding to the space is defined. It is preferable that needle-shaped pins for piercing the scraps of the sheet cut by the blade that defines the cruciform space are provided in the respective portions in the radial direction.

A fork-shaped scraper is provided in the vicinity of the anvil cylinder for removing the scraps from the needle-shaped pins by passing the needle-shaped pins, or in the vicinity of the anvil cylinder. It is preferable that a suction port of a means for sucking the debris by negative pressure is provided at a position where each of the needle pins passes.

Alternatively, the scraper and the suction port adjacent to the scraper may be provided together.

[0016]

In the sheet of the heating element sent from the die roll, the heating element in which the exothermic composition is enclosed is formed aligned in both vertical and horizontal directions. Each heating element is heat-sealed in a grid pattern and partitioned by a heat-sealing portion having a constant width. The heat seal part is formed in a substantially lattice shape.

The die cylinder and the anvil cylinder constituting the cutting apparatus of the present invention are rotated in opposite directions, and the heating element sheet is sandwiched. A blade formed so as to continuously form a plurality of corner cutting angles on the outer peripheral surface of the die cylinder cuts the heating element sheet into individual heating elements just along the heat seal portion. Since no space is provided between the adjacent corners, the large reticulated packing material remains unlike the conventional cutting device (see FIG. 5). As described above, the waste of the packaging material is extremely small, and the packaging material can be easily attached to the widely used conventional manufacturing apparatus (see FIG. 4).

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a cutting device of the present invention will be described with reference to the attached drawings.

FIG. 1 is a perspective view before assembly showing an embodiment of the cutting device of the present invention, and FIG. 2 is a II-I after assembly of the cutting device of FIG.
FIG. 3 is a cross-sectional view taken along the line I, and FIG. 3 is a perspective view of an essential part showing one embodiment of a manufacturing apparatus incorporating the cutting device of FIG.

In FIG. 3, a main part of the manufacturing apparatus 1 is schematically shown.

A die roll 2 is composed of a pair of rollers supported by the machine frame F and rotating in opposite directions while contacting each other in parallel, and heats them in a lattice shape by superposing two packaging materials W on each other. It is to seal. Die roll 2
A hopper 3 for supplying the exothermic composition T having a plurality of supply ports is provided on the upper part of the. At the same time when the packaging material W is heat-sealed, a predetermined amount of the exothermic composition T is filled from the unheat-sealed portion of the packaging material W by the hopper 3 from the upper side, and then the unheat-sealed portion is heat-sealed to form a bag portion. P is formed. Below the die roll 2, a cutting device 4 for cutting the heating element sheet S sent from the die roll 2 into each bag portion P is installed.

As shown in FIGS. 1 and 2, the cutting device 4 is
The machine frame F is placed parallel to each other and rotates in the opposite direction.
It is composed of a pair of cylinders supported by. One cylinder is a die cylinder 6 provided with a blade 5 for cutting the heat generating sheet S on the outer peripheral surface thereof, and the other cylinder presses the heat seal portion of the heat generating sheet S together with the blade 5. This is the anvil cylinder 7. The heat-sealing portion is pressed down by these two cylinders to push it down.

The blades 5 are formed so as to be connected in the axial direction and the circumferential direction of the die cylinder 6 in a corner cut-off shape corresponding to the outer shape of the heating element. Then, the portions 8 of the blade 5 corresponding to the respective sides of the corner angle are shared with the adjacent sides of the corner angle. That is, no gap is provided between the corners unlike the blade 52 of the conventional example (see FIG. 4). On the other hand, the blade 5 forms a small space having a substantially cruciform star shape (hereinafter, referred to as a star-shaped space) 9 in a portion where the four corners are abutted. A square recess 10 slightly smaller than the corner angle is formed in the corner angle so that the bag portion P filled with the exothermic composition T is not pressed. Further, on the outer peripheral surface of the anvil cylinder 7, recesses 11 are formed vertically and horizontally so as to correspond to the recesses 10.

Needle-shaped pins 12 are provided so as to project from the outer peripheral surface of the anvil cylinder 7 corresponding to the star-shaped space 9. The pin 12 is used to pierce and remove a small piece (hereinafter referred to as scrap) C of the packaging material W cut by the portion of the blade 5 forming the star-shaped space 9 when the packaging material W is cut.

On the side opposite to the portion of the anvil cylinder 7 facing the die cinder 6, in parallel with the anvil cylinder 7,
And a scraper 13 is provided at a distance. The scraper 13 has two claws (hereinafter referred to as forks) 14 projecting at positions corresponding to the pins 13 arranged in the axial direction of the anvil cylinder 7 so that the pins 12 can pass through. Then, as the anvil cylinder 7 rotates, the pin 12 that has rotated while piercing the waste C passes through each fork 14, and the waste C is caught by the fork 14 and is removed. The scraps C that have been extracted can be discarded together if a collecting box (not shown) is installed under the scraper 13. In order to collect and dispose of the waste more reliably, the suction port 16 of the suction device 15 is arranged near each of the forks 14 as shown in FIGS. 1 to 3, and the waste removed by each of the forks 14 is disposed. C may be sucked and collected at a negative pressure. In addition, the suction device 15
The scraper 13 may be omitted and the scrap C may be removed from the pin 12 only by the suction device 15 by increasing the suction force of the scraper 13.

In the present embodiment, the corners of the corners defined by the blade 5 are cut into a partial circle (see FIG. 1), but the present invention is not limited to this, and for example,
You may cut straight. In addition, in this embodiment,
The die cylinder 6 and the anvil cylinder 7 are in contact with each other (see FIG. 2), but the present invention is not limited to this, and within a range in which the heat seal portion of the heating element sheet can be pressed by both cylinders, An arbitrary gap can be provided between both cylinders.

As is clear from the above description, the heating element to which the device of the present invention is applied is composed of two packaging materials and a heating composition. As the exothermic composition, a composition utilizing the heat of oxidation of iron powder in the presence of air and water is usually used. Of the two packaging materials for such an exothermic composition, one is usually a breathable packaging material and the other is a non-breathable packaging material. Examples of the breathable packaging material include a packaging material made of a breathable plastic film (for example, a porous film having fine continuous pores) and a non-woven fabric or paper, and a packaging material made of a plastic film having a perforated part and a non-woven fabric or paper. . Examples of the non-breathable packaging material include a packaging material made of a non-breathable plastic film and a non-woven fabric or paper, a packaging material made of a non-breathable plastic film coated with an adhesive entirely or partially.

According to the main cutting device 4 constructed as described above, the corners can be cut together with the cutting of the heating element sheet S without making the outer shape of the heating element smaller than the conventional one. In addition, the amount of waste of the packaging material W is extremely small (the waste C), so that the material cost can be saved. This is extremely convenient since it can be used with little change in other components with respect to the manufacturing apparatus equipped with a conventional slitter and cutter, which is more widely used.

[0029]

According to the cutting apparatus of the present invention, the corners can be cut together without reducing the outer shape of the heating element as compared with the conventional one and reducing the waste of the packaging material. further,
There is an advantage that it can be easily applied to a conventional heating element manufacturing apparatus.

[Brief description of drawings]

FIG. 1 is a perspective view before assembly showing an embodiment of a cutting device of the present invention.

2 is a cross-sectional view taken along the line II-II of the cutting device of FIG. 1 after assembly.

FIG. 3 is a perspective view of a main part showing an embodiment of a manufacturing apparatus in which the cutting device of FIG. 1 is incorporated.

FIG. 4 is a schematic sectional view showing an example of a conventional manufacturing apparatus.

FIG. 5 is a perspective view showing another example of a cutting machine in a conventional manufacturing apparatus.

[Explanation of symbols]

4 cutting device 5 blades 6 die cylinder 7 Anvil cylinder 8 side blades 9 Star space 10 recess 11 recess 12 pin 13 scraper 14 forks 15 suction device 16 Suction port F machine frame W packaging S heating element sheet C scraps

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kiyoshi Kamiya             2-12-13 Nishi, Koto-ku, Osaka             Chemical Industry Co., Ltd.

Claims (6)

[Claims] 1. A cutting device for cutting a sheet, in which a plurality of rows of heating elements filled with a heating composition are formed, into individual heating elements each having a cut corner shape, and in a reverse direction. A die cylinder, which is supported by a machine frame so as to be able to rotate, is provided on an outer peripheral surface of a blade for cutting the sheet, and an anvil cylinder facing the die cylinder in parallel with the axial direction, and the blade is The die cylinder is formed in a plurality of corner cutting angles arranged in the axial direction and the circumferential direction, and the blade portions corresponding to the respective sides of the corner cutting angles are shared with the sides of the adjacent corner cutting angles. Cutting device for heating element production. 2. At least one of a square area inside each corner cutting edge demarcated by the blade and slightly smaller than the corner cutting angle or an outer peripheral surface of the anvil cylinder corresponding to the area is a recess. The cutting device according to claim 1, wherein 3. A substantially cruciform star-shaped space is defined by abutting the corners of four adjacent corner-cut corner blades, and the outer peripheral surface of the anvil cylinder corresponding to the space is defined. 2. The cutting device according to claim 1, wherein needle-shaped pins for piercing the scraps of the sheet cut by the blade that delimits the space are radially provided at the respective portions of the above. 4. The cutting device according to claim 3, further comprising a fork-shaped scraper provided in the vicinity of the anvil cylinder for removing the scraps from the needle pins by allowing the needle pins to pass therethrough. . 5. The cutting according to claim 3, wherein a suction port of a means for sucking the debris by negative pressure is provided in a position near each of the anvil cylinders and at a position where each of the needle pins passes. apparatus. 6. The cutting device according to claim 3, wherein the scraper according to claim 4 and the suction port according to claim 5 adjacent to the scraper are both provided.