JPH05112332A - Heating roll device to form heat-bonded part for packaging container - Google Patents

Abstract

PURPOSE:To provide a heating roll device to form a heat-bonded part for packaging containers, which requires less power consumption by heating the heating roll to a specified temperature efficiently in a short period of time; has an excellent temperature controllability; and gives less thermal influence to the bearing, etc., of the driving shaft. CONSTITUTION:A driving shaft 1 is penetrated through a heating roll 21 while placing a gap 27, and the heating roll 21 is supported by the driving shaft 1 at both ends. A heating body 41 which is made of an electric resistor, is arranged in the gap 27 to be away from the driving shaft 1, and is brought into contact at least with an area to correspond with a force piston 25, on the inner side peripheral surface of a roll main body 24 of the heating roll 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention forms a tubular packaging material into which contents can be filled when a packaging material such as a bag or a carton is continuously molded by folding one of the strip-shaped packaging materials into two or stacking the two. In order to achieve this, the present invention relates to a heating roll device for continuously heat-bonding overlapping side edge portions of a packaging material, or for partitioning adjacent packaging containers by thermally bonding them at regular intervals in the longitudinal direction of the packaging material. ..

[0002]

2. Description of the Related Art When a flexible band-shaped packaging material made by laminating a synthetic resin film on paper, cellophane, metal foil or the like is formed into a tubular shape to fill the contents and continuously form a bag,
When folding a rigid band-shaped packaging material made by stacking synthetic resin film on paper to continuously form a carton, a bag of a predetermined shape is formed by melting the synthetic resin film at the overlapping portion of the packaging material and forming a heat-bonded part. Molding into cartons is well known.

In FIG. 5, a flexible band-shaped packaging material 101 is folded in two, and the overlapping side edge portions are sandwiched by a pressing die 106 formed in the circumferential direction of a heating roll 105, and a vertical thermal adhesive portion 102 is formed.
Is continuously formed into a tubular shape, and a predetermined amount of the content is supplied into the tubular material, and the front and rear surfaces of the packaging material 101 are sandwiched between the pressing dies 108 formed in the axial direction of the heating roll 107 to form the lateral thermal adhesive portion 103. 1 schematically shows a known technique for continuously molding the hermetically sealed packaging bag 104 by repeating the operation of forming at regular intervals.

FIG. 6 is a cross-sectional view showing a general heating and supporting means of the heating roll 105 forming the vertical heat-bonding portion 102 shown in FIG. The heating roller 105, which is formed by circumferentially projecting the 106 and the receiving wheel 111, is attached to the hollow drive shaft 112.
The drive shaft 112 with the both ends of the support frame 114, 11
5 and is rotatably supported by bearings 116 and 117. A gear 118 for transmitting a rotational force is fixed to one end of the drive shaft 112, and a terminal unit 119 having a slip ring is fixed to the opposite end thereof to obtain an electric resistance. This is a configuration in which a rod-shaped heating element 120 made of a body is inserted into the hollow portion 113.

That is, the drive shaft 112 is heated by the electric resistance heat generated by the heating element 120, and then the heating roll 105 is heated by the heat conduction from the drive shaft 112. Since the thermal efficiency is extremely low, it takes a considerably long time from the start of energization until the die 106 reaches the required temperature, which hinders the improvement of work efficiency, consumes a large amount of electricity, and has a low responsiveness to a temperature change. Poor temperature controllability after reaching the required temperature.

Further, since the drive shaft 112 is heated to a temperature equal to or higher than the surface of the die 106,
The bearings 116 and 117 are also heated to have a short life, and the supporting frames 114 and 115 are also heated and thermally expanded, so that the gap size between the heating rolls 105 facing each other and the pressure contact force with respect to the packaging material 101 are changed, so that a constant adhesion state is obtained. It is difficult to form the vertical heat-bonding portion 102.

On the other hand, the heating and supporting means of the heating roll 107 forming the lateral heat-bonding portion 103 is also the same as above.
Therefore, this heating roll 107 also has the same problem as described above.

[0008]

The problem to be solved by the present invention is that the heating roll is mounted on a hollow drive shaft and is heated by a heating element disposed inside the drive shaft. Is low and the rise time to a predetermined temperature is long and the amount of electricity consumption is large, the temperature controllability is not good, the gap size of the die and the pressure contact force are likely to change,
That is the point.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a heating roll having a pressing die for heat-bonding protruding from an outer peripheral surface of a cylindrical roll body, and a drive shaft having a gap. The heating roll is supported at both ends by the drive shaft so as to rotate integrally, the heating element made of an electric resistor is separated from the drive shaft, and corresponds to at least the pressing die on the inner peripheral surface of the roll body. The heating roll is configured so as to be in contact with the portion to be placed in the space and to be thermally efficient, to rise to a predetermined temperature in a short time with low power consumption, and temperature control is easy, and changes in the gap size and pressure contact force are small. It is intended to provide a device.

[0010]

When the heating element is energized to generate heat, this heat is directly transmitted to the roll body and heats the die to a predetermined temperature, and does not directly heat the drive shaft. Since the heating roll is in contact with the heating element, the heating roll efficiently rises to a predetermined temperature in a short time and quickly follows the temperature change. In addition, the power consumption is small and the thermal influence on the bearings and the like via the drive shaft is small.

[0011]

EXAMPLE An example in which the present invention is applied to two sets of heating rolls for forming a hermetically sealed bag shown in FIG. 5 will be described with reference to the drawings. 1 and 2 are examples of a heating roll forming a vertical heat-bonding portion, and FIGS. 3 and 4 are examples of a heating roll forming a horizontal heat-bonding portion.

In FIGS. 1 to 4, a drive shaft 1 is screwed onto a screw-shaped intermediate shaft 4 having a screw portion 2 at the tip and a head 3 with a hexagonal hole at the base end. A distal end shaft 5 and a proximal end part 6 slidably fitted to the proximal end part are arranged on the same central axis, and the distal end shaft 5 and the proximal end shaft 6 are separated from each other by an intermediate shaft 4. The entire diameter is larger than that of the above, and the support frames 51 and 52 are rotatably supported by the bearings 7 and 8, respectively.

A bush 9 and a gear 10 for transmitting a rotational force are fitted on the tip side of the bearing 7 of the tip shaft 5 so as to be movable in the central axis direction, and a nut 12 is screwed on a threaded portion 11 on the tip side. Has been done. By tightening this nut 12,
The bearing 7 is pressed against the flange 13 formed at the base of the tip shaft 5 via the gear 10 and the bush 9, and the tip shaft 5 rotates integrally with the intermediate shaft 4 without rattling.

The base shaft 6 has a stepped through hole 15 for fitting the intermediate shaft 4 and the head 3 with substantially no gap, and the through hole 1.
5, a current collector 19 including a brush and a slip ring is detachably attached to a mounting flange 17 formed at the base end and having a groove hole 16 open to the front and back. Further, the base end shaft 6 has a uniform outer diameter except for the mounting flange 17 at the base end and the small-diameter fitting portion 6a at the tip end so that the base end shaft 6 can be pulled out from the bearing 8 in the base end direction.

The heating roll 21 of FIGS. 1 and 2 and FIGS.
In the heating roll 31 of FIG. 1, the mounting rings 22 and 32 fixed to the end portions of the heating rolls are fitted into the fitting portions 5a of the base portion of the tip shaft 5 so as to be pressed against the flange portion 13 and joined by the key 14, It is designed to rotate together with 5. Further, the fitting portions 6a of the proximal shaft 6 are fitted into the fitting holes 23 and 33 provided at the proximal end portions of the heating rolls 21 and 31, so that the heating rolls 21 and 31 have drive shafts at both ends. 1 is rotatably supported integrally with the front end shaft 5 and the base end shaft 6 and has gaps 27 and 37 between it and the intermediate shaft 4.

In the heating roll 21 shown in FIGS. 1 and 2, a pressing die 25 for forming a vertical thermal bonding portion and a receiving ring 26 are circumferentially projected on the outer peripheral surface base end and tip of a cylindrical roll body 24. The two heating rolls 21 arranged with the packaging material sandwiched therebetween are kept parallel by the contact between the receiving wheels 26. The inside of the die 25 has an inner diameter larger than the inner diameter of the roll body 24, and the void 27 is enlarged.
A coupling ring 28 having a fitting hole 23 is fitted and fixed so that the proximal end shaft 6 is fitted therein, and is joined by a key 29.

On the other hand, a heating element 41 consisting of a coiled electric resistance wire is in contact with the inner peripheral surface of the pressing die 25 and is spaced from the coupling ring 28 and is inserted into the space 27. Is connected to the conductive wire 42 reaching the inside of the heating roll 21 from the current collector 19 through the slot 16 by the connection terminal 43, and is configured to intensively heat the die 25.

Next, the heating roll 31 shown in FIGS. 3 and 4 comprises a cylindrical roll main body 34 having three outer circumferential surfaces of the roll main body 34 protruding from the outer peripheral surface thereof at equal intervals in the circumferential direction in the direction of the central axis. A fitting hole 33 is formed in a coupling ring portion 36 formed integrally with the base end of the roll main body 34, and the base end shaft 6 is fitted therein and is connected by a key 38.

A heating element 45 consisting of a coil of electric resistance wire is inserted into the space 37 and the roll body 34
The heating element 45 is arranged in contact with the inner peripheral surface of the heating roller 31 over almost the entire length thereof, and the heating element 45 reaches the inside of the heating roll 31 from the current collector 19 through the slot 16 and the connection terminal 4.
7 and is configured to directly heat the entire roll body 31.

The inside of the two heating rolls 21 and 31 penetrates the intermediate shaft 4 of the drive shaft 1 with a considerably large gap, and is separated from the heating elements 41 and 45.

In each embodiment having such a structure, when the heating elements 41, 45 are energized to generate electric resistance heat, the heat heats the roll bodies 24, 34 to bring the pressing dies 25, 35 to a predetermined temperature, The heat-bonded portions are formed respectively. At this time, the heating elements 41 and 45 contact the inner peripheral surfaces of the roll bodies 24 and 34 and directly transfer heat, so that the work efficiency can be improved by rising to a predetermined temperature in a short time after the start of energization.
In addition, since the heating elements 41 and 45 are not in contact with the drive shaft 1 and do not heat the heating rolls 21 and 31 via the drive shaft 1, there is an advantage that not only thermal efficiency is good but also power consumption is small. Moreover, since unnecessary heating is not performed, the thermal influence on the bearings 7 and 8 is small. Furthermore,
Even when the temperature is adjusted to the set temperature after reaching the predetermined temperature, the temperature can be changed quickly by only performing the current control because the heating elements 41 and 45 are in contact with the roll bodies 24 and 34. It has excellent sex.

In this embodiment, the heating elements 41 and 45 are formed in a coil shape so that they can be easily attached to and detached from the roll bodies 24 and 34. Particularly, in the embodiments shown in FIGS. Although the heating element 45 can be uniformly heated over the entire length, in the embodiment of FIGS. 3 and 4, the heating element 45 may be formed in a rod shape or a plate shape and linearly arranged in a portion corresponding to the pressing die 35. ..

Further, according to the structure of this embodiment, the intermediate shaft 4
The heating rolls 21 and 31 can be separated by detaching the heating rolls 21 and 31 from the tip shaft 5 and pulling them out from the heating rolls 21 and 31, and moving the base end shaft 6 slightly toward the base end. Inspection, repair and replacement can be easily performed. However, it is not limited to this configuration.

[0024]

As is apparent from the above, according to the present invention in which the heating element is in contact with the inner peripheral surface of the heating roll and is not in contact with the drive shaft, the pressing die of the heating roll can be heated efficiently to a predetermined temperature in a short time. Not only can it be started up and consumes less power, it also follows temperature changes quickly and has excellent temperature controllability. Furthermore, changes in the die gap size and pressure contact force due to thermal effects on the bearings are small and constant adhesion. The heat-bonded portion in the state can be formed.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX in FIG.

FIG. 3 is a vertical sectional view showing another embodiment of the present invention.

4 is a cross-sectional view taken along the line YY of FIG.

FIG. 5 is a perspective view showing an example of forming a heat-bonding portion.

6 is a vertical cross-sectional view of the heating roll in FIG.

[Explanation of symbols]

 1 Drive Shaft 21, 31 Heating Roll 24, 34 Roll Main Body 25, 35 Stamping Die 27, 37 Void 41, 45 Heating Element

Claims (2)

[Claims] 1. A drive shaft has a gap and penetrates a heating roll having a pressing die for heat bonding protruding from the outer peripheral surface of a cylindrical roll body, and the heating roll has both ends. Part is rotatably supported integrally with the drive shaft, and a heating element made of an electric resistor is separated from the drive shaft and is in contact with at least a portion of the inner peripheral surface of the roll body corresponding to the pressing die. A heating roll device for forming a heat-bonded portion of a packaging container, which is arranged in the gap. 2. The heating roll device according to claim 1, wherein the heating element is a coiled wire.