JP3084701B2 - Heat sealing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat sealing apparatus for heat sealing a film used in a film packaging machine or the like.

[0002]

2. Description of the Related Art As a conventional heat sealing apparatus using this type of heat sealing roll, for example, Japanese Patent Publication No.
As shown in, for example, Japanese Patent No. 69872, a continuously transported film is folded, the folded both edges thereof are overlapped and vertically sealed by a vertical sealing mechanism, and the packaging film is formed into a tubular shape by the vertical sealing portion. Then, the film formed into a cylindrical shape is horizontally sealed by a horizontal sealing mechanism to form a bottom portion that becomes a packaging bag, and thereby the content formed of a liquid or the like is filled into the film formed into a bottomed cylindrical shape by a filling mechanism. Filling, further film feeding and horizontal sealing by the horizontal sealing mechanism to make a small bag, then cut and carry out the intermediate part of the horizontal sealing point where the small bag was formed by the cutter mechanism as a single packet, or After making the small bag by laterally sealing with the horizontal sealing mechanism, the cutter mechanism is stopped, and the small bags in the continuous state where the small bags are continuously connected are carried out, Those so as to packaging and packing in the storage box For example are known.

[0003] In this case, the film guided and guided from the rolled original film is turned back and guided,
As described above, the guided fold film is filled and packed with contents while making a bag by the vertical sealing mechanism and the horizontal sealing mechanism, but the vertical sealing mechanism and the horizontal sealing mechanism include:
The heat seal roll bodies arranged in parallel to each other are driven to rotate in opposite directions to each other, and the film is sandwiched and passed between the heat seal members provided on each heat seal roll body while being pressed and pressed. The film is melted and sealed while the contents such as a liquid and a viscous substance existing inside the film are expelled upward or downward by heating.

The film used for such heat sealing is extremely thin, such as several tens of microns. In order to superimpose and heat seal the thin films, a pair of heat sealing roll bodies are provided mutually. It is necessary to properly adjust the interval between the heat seal members.

That is, if the distance between the sealing members is too large with respect to the thickness of the film, the pressure applied to the film is insufficient, so that an unsealed portion is generated due to poor penetration of the film, and the distance between the sealing members is reduced. If it is too small, there is a problem in that the pressure applied to the film becomes large, the molten resin provided inside the film is crushed, the sealing portion becomes thin, and the sealing strength is reduced, thereby causing poor sealing.

Therefore, the clearance adjustment of each vertical seal member provided in each vertical heat seal roll main body of the vertical seal mechanism, or the adjustment of each horizontal seal member provided in each horizontal heat seal roll main body of the horizontal seal mechanism, is performed. In the clearance adjustment, one of the paired vertical or horizontal heat seal roll main body is rotatably supported at a set position, and the other heat seal roll main body portion is moved toward and away from one heat seal roll main body. The other heat-sealing roll main body is supported so as to be rotatable and rotatable, and is adjusted by displacing the other heat-sealing roll main body with respect to one of the heat-sealing roll main bodies by, for example, a spring pressure of a spring.

In the above-described heat seal roll body of the vertical sealing mechanism or the horizontal sealing mechanism, since the clearance adjustment between the respective sealing members is set in consideration of the operator's intuition, generally several tens of them are used. For films with a thickness of microns, a few microns
It is very troublesome to perform the clearance adjustment of about ten and several microns, and there is a problem that there is a high possibility that a sealing failure occurs in the vertical sealing portion or the horizontal sealing portion of each heat seal roll body.

In consideration of this point, Japanese Patent Publication No.
In Japanese Patent No. 69872, as shown in FIG. 9 and FIG.
For example, in a horizontal sealing mechanism, a sealing member 2 for heat-sealing the film F in a sandwiched state is provided on each of the horizontal heat sealing roll main bodies 1 arranged close to and parallel to each other, and each of the pair of heat sealing roll main bodies 1 is provided. Position regulating flanges 3 that contact each other on the outer peripheral surface at both ends
The outer diameter of the outer peripheral surface of the seal member 2 is set to be slightly smaller than the outer diameter of the position restricting flange 3.

In this case, the clearance between the seal members 2 attached to each heat seal roll main body 1 is set to a predetermined distance by abutting the outer peripheral surfaces of the position regulating flanges 3 of the pair of heat seal roll main bodies 1 and abutting against each other. It is possible to properly pressurize and heat the film F between the sealing members 2 by being heated to the specified conditions, and it is possible for anyone to be easily performed regardless of the skill. There is an advantage that the man-hour for adjustment is reduced.

[0010]

By the way, the heat seal roll main body 1 and the seal member 2 provided with the above-mentioned position regulating flange 3 are required to manufacture the heat seal roll main body 1.
By forming the part and the seal member 2 separately and assembling the parts to form a horizontal sealing mechanism, for example, when the seal member 2 is worn out, the parts of the seal member 2 alone are partially replaced. The replacement work can be easily performed, and the cost of parts can be reduced by replacement.

However, by providing each component separately, the heating temperature of the heater (not shown) embedded inside the heat seal roll main body 1 is provided separately from the position regulating flange 3 provided on the heat seal roll main body 1. And the heating temperature of the position regulating flanges 3 located on both sides of the seal member 2 tends to be lower than that of the seal member 2, that is, the discs located on both sides. The side peripheral surface of the position regulating flange 3 which is formed in a protruding shape has a surface that is exposed to the outside air and easily radiates heat. As a result, the heating temperature of the seal member 2 becomes higher than the heated temperature of the position regulating flange 3. The temperature difference causes a dimensional difference due to each thermal expansion, and the value becomes far from the initially set clearance dimension, and the pressure of the film F is increased. There is a problem that the state of the heating is changed.

In order to avoid this point, the heat sealing roll body 1, the sealing member 2, and the position regulating flange 3
It is conceivable that the temperature difference is minimized by keeping the heat transfer efficiency almost constant by forming the components integrally, but if each component is formed integrally, it takes time and effort to perform cutting and other processing. When the clearance size changes due to wear of the seal member 2 formed on the heat seal roll main body 1 and the like, the heat seal roll main body 1 formed integrally with the seal member 2 is troublesome and the cost tends to increase. It is necessary to replace itself, and there is a problem that the replacement work is troublesome and replacement parts cost increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a heat seal device which can be easily manufactured and can easily perform component replacement while maintaining a substantially constant clearance between seal members, particularly in a horizontal seal mechanism. And

[0014]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a pair of horizontal heat seal roll bodies which are arranged in parallel and are driven to rotate in opposite directions to each other, and are provided on the pair of horizontal heat seal roll bodies, respectively. A sealing member for heat-sealing the film formed in a tubular shape between the outer peripheral surfaces thereof in a state of being sandwiched in a direction crossing the film; and a pair of outer heat-sealing roll bodies provided at at least two locations corresponding to each other. An outer peripheral surface for heat-pressing and heating the film at a central portion of the seal member along a longitudinal direction of the heat seal roll main body, the inter-axial reference flange having a surface disposed so as to be abuttable. At the both ends of the outer peripheral surface of the heat seal, abutment is provided so as to project slightly smaller than the thickness of the film in a state where they abut against each other. The lance setting abutting portions provided a heat-sealing device, characterized in the outer diameter that is set to the outer diameter equal to or slightly larger diameter of the reference flange between the axis of the clearance setting abutting portions.

[0015]

A clearance setting abutting portion is provided at the outer peripheral surface of the seal member attached to each of the pair of horizontal heat seal roll bodies, at both ends of which a pair of seal members abut against each other. By setting the outer diameter of the outer peripheral surface of the heat seal at the center of the seal member to a value slightly smaller than the thickness of the film based on the outer diameter of the clearance setting abutting portion, the film can always be properly applied. Can be pressed, and the sealing member can be manufactured and processed separately from the manufacturing process of the horizontal heat seal roll main body. This facilitates production by cutting work, etc., and the heating temperature of only the sealing member is almost constant. Therefore, it is possible to maintain a predetermined clearance by arbitrarily setting the outer diameter of the outer peripheral surface portion of the seal member. .

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings.
The present invention can be applied to both vertical and horizontal packaging machines. In this embodiment, a heat sealing device applied to a filling and packaging machine which is a vertical pillow packaging machine will be described in detail as an example. FIG.
FIG. 5 to FIG. 5 show a first embodiment of the present invention. A holding frame 12 is provided on the side of a machine base 11 of a filling and packaging machine so that a film roll R wound in a roll shape can be exchanged. The film F is pulled out and guided from the film roll R supported by the frame 12.

A film guide portion 13 comprising a film slack preventing mechanism is provided on the upper portion of the machine base 11, and a film F passing through the film guide portion 13 is provided so as to be guided to a film folding portion 14. A rod-shaped guide rod 15 for supporting and guiding the folded portion of the film F is hung down from the film turn-up portion 14, and a nozzle 17 provided in a filling mechanism 16 is provided in parallel with the guide rod 15 and is hung down. It is provided so that contents W such as sauce and soy sauce can be filled.

A vertical seal mechanism 18 and a horizontal seal mechanism are provided below the film folding portion 14 on the front side of the machine base 11 from above.
19, a cutter mechanism 20 is provided, the film F is pulled out from the film reversing section R, led out to the film folding section 14 via the film guide section 13, and the film F is lengthened by the guide rod 15 provided in the film folding section 14. The film F is vertically folded by a vertical sealing member 22 provided on a pair of opposed vertical heat sealing roll main bodies 21 of the vertical sealing mechanism 18 in a state where the folded end edges of the film F are overlapped with each other. Sealing, the packaging film F is formed into a cylindrical shape by the vertical sealing portion HS, and the cylindrically formed film F is mounted on a pair of horizontal heat sealing roll main bodies 23 opposed to each other by the horizontal sealing mechanism 19. The member 24 is laterally sealed in a direction transverse to the longitudinal direction of the film F, and the horizontal seal portion WS forms a bottom portion serving as a packaging bag. Filling mechanism in the film F
After filling the contents W with 16 and further feeding the film F and laterally sealing by the horizontal sealing mechanism 19 to form a small bag P, the intermediate portion of the horizontal sealing portion WS where the small bag P is formed is operated by the cutter mechanism 20. Sachet P packaged by
Then, the small bag P is unloaded through the unloading mechanism, or the operation of the cutter mechanism 20 is stopped, and the small bag P connected in a continuous state can be unloaded through the unloading mechanism.

The horizontal seal mechanism 19 has a bearing stand 25 mounted on the front surface of the machine base 11 and one horizontal heat seal roll body 23 rotatably supported between the bearing stands 25.
A pair of upper and lower guide shafts 26 are fixedly protruded from 25, a support plate 27 is fixed to the tip of the guide shaft 26, and a bearing slide base 28 is slidably mounted on the guide shaft 26, and the bearing slide base 28
The other horizontal heat seal roll main body 23 is rotatably bearing, and one horizontal heat seal roll main body 23 and the other horizontal heat seal roll main body 23 are disposed in parallel with each other. A helical gear 29 meshing with the other horizontal heat seal roll body 23 is fixed, and a driven bevel gear 30 is integrally provided with the one helical gear 29, and the driven bevel gear 30 is provided in the machine base 11. Drive bevel gear 31 driven by a drive device (not shown)
Are engaged.

A heater H is built in a horizontal heat seal roll main body 23 forming a pair of the horizontal seal mechanism 19,
At the outer peripheral portion of each horizontal heat seal roll main body 23, the above-mentioned horizontal seal member 24 for heat sealing while being sandwiched in a direction crossing the cylindrical film F is attached,
Interaxial reference flanges 32 are provided at both ends of the horizontal seal member 24 so as to be able to abut the outer peripheral surfaces thereof integrally with the pair of horizontal heat seal roll main bodies 23. Is provided with an air cylinder 33 capable of resiliently pressing a bearing slide table 28 that supports the other horizontal heat seal roll main body 23 toward one of the horizontal heat seal roll main bodies 23 with a piston 33A.

The horizontal seal members 24 are attached to the pair of horizontal heat seal roll main bodies 23 at regular intervals so as to oppose each other. Along the longitudinal direction of 23, a heat seal outer peripheral surface 24A for pressurizing and heating the film F is provided at a central portion of each horizontal seal member 24, and a heat seal provided on each horizontal seal member 24 is provided. A clearance setting abutment portion 24B is provided to project from the both end portions of the outer peripheral surface 24A to a dimension slightly smaller than the thickness of the film F in a state of abutting each other, and the outer diameter of the clearance setting abutment portion 24B is provided. Dimension the shaft reference flange 32
The horizontal seal mechanism 19 is configured to be equal to or slightly larger than the outer diameter of the horizontal seal mechanism 19.

According to the horizontal sealing mechanism 19 of the first embodiment configured as described above, the air cylinder is used for the one horizontal heat sealing roll main body 23 fixed to the bearing stand 25 of the machine base 11 of the packaging machine. The outer peripheral surface of the clearance setting contact portion 24B of the horizontal seal member 24 attached to each axial reference flange 32 or the horizontal heat seal roll body 23 by controlling the pressure of the other horizontal heat seal roll main body 23 to a predetermined pressure by the operation of 33 Are brought into contact with each other, so that the distance between the heat seal outer peripheral surfaces 24A of the horizontal seal members 24 which are opposed to each other with the rotation of the pair of horizontal heat seal roll main bodies 23 by the horizontal seal mechanism 19, the clearance of the horizontal seal members 24 The dimensions are set when the setting abutting portions 24B are in contact with each other, and the clearance setting abutting portions 24B are formed on the heat seal outer peripheral surface 24A of the horizontal sealing member 24 facing each other. Dimension of which projects in and have set slightly narrower interval than the thickness of the film F, the film F clearance setting abutting portion 24B from the thickness of the
Of the base film acts as a pressing force, that is, acts on the thickness of the base film provided on the outside of the film F and heat welding provided on the inside when the film F is pressed and heated. In consideration of the thickness of the molten resin layer, a sufficient pressing force is applied to the molten resin layer, and a distance interval corresponding to a thickness satisfying a predetermined adhesive strength is set.

When the material and thickness of the film F are different, the heat seal outer peripheral surface 24A of the horizontal seal member 24 assembled and fixed to the pair of horizontal heat seal roll main bodies 23 and the clearance setting abutting portion 24B. By appropriately setting the step size, a predetermined pressing force can be obtained, and the film thickness can be changed simply by replacing only the horizontal seal member 24 formed individually with respect to the horizontal heat seal roll body 23. And the like.

Further, the horizontal heat seal roll main body 23 is heated by the heater H embedded inside the pair of horizontal heat seal roll main bodies 23, and at the same time, the horizontal heat seal roll 24 is assembled to the horizontal heat seal roll main body 23. And a heat seal outer peripheral surface 24A is provided at the center of the outer surface of the horizontal seal member 24.
Since the displacement setting due to heat conduction is suppressed by integrally projecting the clearance setting contact portions 24B at both ends of A, errors due to pressurization and heating of the film F can also be suppressed, and stable heat sealing can be performed. There is an effect that can be.

When the opposing horizontal seal member 24 is deviated from the position of the film F with the rotation of the horizontal heat seal roll main body 23, the axial reference flanges 32 provided on the horizontal heat seal roll main body 23 contact each other. Since the rotation is performed while being in contact, the rotation is stably driven.

FIG. 6 shows a second embodiment of the present invention.
Here, in the horizontal seal member 24 attached and fixed to the horizontal heat seal roll main body 23, a heat seal outer peripheral surface 24A for pressurizing and heating the film F is provided at the center of the outer surface of the horizontal seal member 24, and A clearance setting abutment portion 24B is provided at both ends of the heat seal outer peripheral surface 24A, and an escape groove 24C is provided at a boundary portion between the clearance setting abutment portion 24B and the heat seal outer peripheral surface 24A to form the horizontal seal member 24. Make up.

In the horizontal seal member 24 having the above-described structure, for example, the clearance groove 24C is formed by cutting or the like, and the heat sealing outer peripheral surface is bordered by the clearance groove 24C.
By performing post-processing of 24A and the clearance setting abutting portion 24B, the heat sealing outer peripheral surface 24
Finishing of A and the clearance setting abutment portion 24B can be performed, which is advantageous in manufacturing.

In this embodiment, an example in which a flat sealing surface is formed as the heat seal outer peripheral surface 24A is shown. Surface or film F
An appropriate processing such as a groove-shaped sealing surface as a molten resin pool portion may be performed.

FIGS. 8 and 9 show a third embodiment of the present invention. In a horizontal sealing member 24 mounted and fixed to a pair of horizontal heat sealing roll bodies 23, a horizontal sealing portion is provided in the same manner as in the above-described embodiment. Heat seal outer peripheral surface 24A is provided at the center of the outer surface of 24, and clearance setting abutment portions 24B are provided at both ends of heat seal outer peripheral surface 24A.
The clearance setting contact portion 24B is integrally provided with a contact extension portion 24D extending toward the downstream side in the rotation direction of the horizontal heat seal roll main body 23 with respect to the edge position on the downstream side in the rotation direction of the outer peripheral surface of the heat seal. It is provided in. 24C is a clearance setting abutment portion 24B and a heat seal outer peripheral surface 24A.
This is an escape groove provided at a boundary portion with.

The horizontal sealing mechanism 19 having the above-described structure is provided with a heat sealing outer peripheral surface 24A of the opposing horizontal sealing members 24 attached to and fixed to the pair of horizontal heat sealing roll bodies 23.
When the film F is pressurized and heated to form the horizontal seal portion WS of the film F, when the heat seal outer peripheral surface 24A rotates and moves away at the end side edge portion of the horizontal seal portion WS, the clearance setting protrusion is generated. Since the horizontal heat seal roll body 23, which is paired by the abutting extension portion 24D extending further from the abutment portion 24B, makes a rotational transition while keeping a constant interval, the heat seal outer peripheral surface 24A is prevented from biting into the film F. The edge on the downstream side in the rotation direction is separated from the film F, and thus, there is an effect that a stable horizontal seal portion WS can be applied without partially increasing the pressure applied to the film F.

[0031]

According to the present invention, a pair of horizontal heat seal roll bodies which are arranged in parallel and are driven to rotate in opposite directions to each other, and a cylindrical heat seal roll body provided on each of the pair of horizontal heat seal roll bodies is provided between the outer peripheral surfaces thereof. A sealing member for heat sealing in a state of being traversed in a direction crossing the film formed on the main body, and a pair of the horizontal heat sealing roll main bodies provided at at least two places corresponding to each other, and the outer peripheral surfaces thereof are provided so as to be in contact with each other. A heat seal outer peripheral surface for pressurizing and heating the film is provided at a central portion of the seal member along a longitudinal direction of the heat seal roll main body. At both ends of the surface, there is provided a clearance setting abutting portion that projects slightly smaller than the thickness of the film in a state where they abut against each other. By configuring the heat sealing mechanism clearance abutting portion outer diameter dimension set by setting the outer diameter equal to or slightly larger diameter of the reference flanges between the shaft,
When the horizontal heat seal roll main body is heated, heat is conducted to the seal member fixedly attached to the horizontal heat seal roll main body. At this time, the heat seal outer peripheral surface and both end portions are provided at the center of the seal member. Since the clearance setting abutment portion is integrally provided, the amount of displacement due to heat conduction is suppressed, and the gap between the heat seal outer peripheral surfaces opposed to each other with reference to the abutting position of the pair of clearance setting abutment portions. The size can be set so that a predetermined pressing force can be obtained with respect to the thickness of the film, and there is an effect that stable heat sealing can be performed.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a filling and packaging machine showing a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a configuration of a horizontal sealing mechanism of the embodiment.

FIG. 3 is an exploded perspective view showing a main part of the horizontal sealing mechanism of the embodiment.

FIG. 4 is a partial transverse sectional view showing the transverse sealing mechanism of the embodiment.

FIG. 5 is a schematic diagram showing a heat-sealed state of the film of the example.

FIG. 6 is a perspective view of a horizontal seal member according to a second embodiment of the present invention.

FIG. 7 is a perspective view of a horizontal seal member according to a third embodiment of the present invention.

FIG. 8 is a cross-sectional view of a main part of the horizontal sealing mechanism showing an assembled state of the embodiment.

FIG. 9 is a perspective view of a main part showing a horizontal sealing mechanism of a conventional device.

FIG. 10 is a cross-sectional view showing a main part of the conventional device.

[Explanation of symbols]

 19 Horizontal seal mechanism 23 Horizontal heat seal roll main body 24 Horizontal seal member 24A Heat seal outer peripheral surface 24B Clearance setting abutment part 24C Escape groove 24D Abutment extension part 32 Center reference flange F Film WS Horizontal seal part W Contents P Pouch

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-228826 (JP, A) JP-A-6-155578 (JP, A) Fully open 49-121955 (JP, U) Fully open 50607 (JP, U) Japanese Utility Model Showa 60-13305 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B65B 51/10 B65B 51/16 B29C 65/20-65/32

Claims (3)

(57) [Claims] 1. A pair of horizontal heat seal roll main bodies which are arranged in parallel and are driven to rotate in opposite directions to each other, and a film which is provided on each of the pair of horizontal heat seal roll main bodies and which is formed into a cylindrical shape between outer peripheral surfaces thereof. A sealing member for heat-sealing in a crosswise direction in a sandwiched state, and an axial reference flange provided on the pair of horizontal heat-sealing roll main bodies so as to correspond to at least two places, respectively, and arranged so that the outer peripheral surfaces thereof can contact with each other. Along the longitudinal direction of the heat seal roll body, along with providing a heat seal outer peripheral surface for pressurizing and heating the film at the center of the seal member, at both ends of the heat seal outer peripheral surface A clearance setting abutment projecting from the film in a state slightly smaller than the thickness of the film, A heat sealing apparatus wherein the outer diameter of the portion is set to be equal to or slightly larger than the outer diameter of the inter-axis reference flange. 2. The heat sealing device according to claim 1, wherein an escape groove is provided at a boundary between the clearance setting abutting portion of the seal member and the outer peripheral surface of the heat seal. 3. The clearance setting abutting portion of the seal member is provided integrally with a abutting extending portion extending toward a downstream side in a rotation direction of the horizontal heat seal roll main body. The heat sealing device according to claim 1 or 2.