JPH1016924A - Heat-sealer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat-sealer wherein a single heat-sealer can handle objects to be packaged of different shapes and well-finished packaging is possible. SOLUTION: Holding means 10, 20 constructed to be deformable on a plane are deformed in curvature into a predetermined shape and positioned by a fixing device 30, and a thermo-welding plastic film is held between a heating means 40 and a receiving means carried by the positioned holding means 10, 20 to weld or weld and fuse the plastic film.

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 used for heat-sealing an opening of a plastic packaging bag, and more particularly to a heating means such as a nichrome ribbon and a heat-resistant rubber. The heat-welding plastic film or sheet (hereinafter simply referred to as “heat-welding plastic film”) sandwiched between the receiving means is heated by the heating means to heat-seal the heat-welding plastic film. Or a heat-sealing device that cuts the seal together with the heat seal, wherein the shape of the heat seal and the seal cut,
That is, the present invention relates to a heat seal device capable of appropriately changing a seal wire into an arbitrary shape.

[0002]

2. Description of the Related Art Conventionally, a nichrome ribbon or a nichrome wire is pressure-bonded to a heat-welding plastic film, and a large-capacity current is instantaneously applied to the nichrome ribbon or the nichrome wire to generate heat, thereby welding or welding a heat-welding plastic film. Welding
Fusing heat seals are widely used.

FIGS. 5 and 6 show an example of a heat sealing apparatus used for this heat sealing.

In the heat sealing apparatus shown in FIG. 5, a linear receiving rubber 72 made of heat-resistant rubber is fixed to the lower end, and the receiving rubber 72 is pressed against the heat-welding plastic film 60 so as to be vertically movable. Crimping plate 74 and crimping plate 7
4 and a seal base 78 on which a nichrome wire 76 is placed via an insulator 79 at the top, and a heat-sealable plastic film 60 disposed between the seal base 78 and the pressure plate 74 is pressed against the pressure plate. After holding the film 60 by the downward movement of the film 74, a large-capacity current is instantaneously applied to the nichrome wire 76 to weld the film 60 in a straight line or to weld and fuse it.

The heat seal device shown in FIG. 6 is basically similar in structure to the heat seal device shown in FIG.
In order to make the seal shape a semi-circular shape, the pressure bonding plate 74 and the seal base 78 are curved in a vertically symmetrical semi-circular shape, and in the groove formed in the semi-circular insulator 79, the nichrome wire is replaced. A ribbon-shaped or band-shaped nichrome wire (hereinafter simply referred to as “nichrome ribbon”) 80 is fitted.

[0006]

In the conventional heat sealing apparatus, a linear seal shape as shown in FIG. 5 and an arc seal shape as shown in FIG. 6 are formed. However, it is technically difficult to make them changeable from the insulator that holds the nichrome wire or the nichrome ribbon, the material of the insulator, and the structure that fixes these to the seal base. There is no heat-sealing device that can appropriately change the seal shape according to the size and shape of the package, and it is possible to perform heat-sealing and seal cutting to any desired shape other than the initially set shape. Did not exist.

For this reason, the packaged object packaged by a heat sealing device having a seal shape that does not match the external shape of the packaged product not only has a poor finish after packaging, but also has a seal cut by the heat sealing device. When subjecting the packaged product inserted in the wrapped tube to heat shrink wrapping, the shrinked film or sheet does not adhere to the packaged product, and the film or the like partially loosens, loosens, triangles, squares, etc. The burrs or protruding portions referred to as "one" are generated, and the appearance of the package is poor, and when collective packaging or the like is performed, a sufficient binding force cannot be obtained, which causes collapse of the load.

[0008] Therefore, when packaging with a conventional heat sealing device, loosened, loosened, and protruding portions of the heat-sealed and heat-shrink-wrapped film are again sealed and removed, and the package conforming to the outer shape of the packaged object is removed. And the work efficiency was degraded.

Therefore, the heat sealing device of the present invention can change the shape of the seal by making the shape of the seal variable, and the heat seal device of the present invention can cope with various shapes and sizes of objects to be packaged in one device. By changing the seal wire to a shape that is in close contact with the outer shape, heat sealing can be performed that matches the shape of various items to be packaged, especially when used before heat shrink packaging, the finish is beautiful, An object of the present invention is to provide a heat sealing device capable of performing heat shrink wrapping with a good yield.

[0010]

In order to achieve the above object, a heat sealing apparatus according to the present invention comprises a heating means 40 comprising, for example, a series of nichrome ribbons;
A heat sealing plastic film is sandwiched between the receiving means 42 opposed to the heating means, and the heating means is heated to weld the sandwiched heat welding plastic film, or to perform welding and fusing. A fixture 3 for positioning a plurality of holding means 10 and 20 for holding the receiving means 42 so as to face each other to a desired curvature deformation or a shape including a curve on a plane.
0, 50 is provided.

The holding means 10 and 20 for holding the heating means 40 and the receiving means 42 have chains 12, 2 having support shafts 14, 24 projecting from one side surface of a plurality of links, respectively.
2 and a plurality of cylindrical support members 16 and 26 rotatably supported on the respective support shafts 14 and 24. The distal ends of the support members 16 and 26 traverse in the diameter direction of the support members 16 and 26. And a heating means 40 formed in, for example, a ribbon shape.
The receiving means 42 formed in the shape of a prism are fitted respectively,
It is characterized in that the support members 18 (or 28) are bridged.

The fixture 30 for positioning the shape of each of the holding means 10, 20 is a band-shaped flexible member, preferably,
For example, the plate spring has fixed elasticity 32, 32 at both ends in the longitudinal direction of the leaf spring, and can be formed in an arc shape with a desired curvature by changing the distance between the fixed pieces 32, 32 and positioning. The supporting means 10, 2
0 can be brought into contact with the swelling side surfaces of the fixtures 30, 30 to change the curvature of the heating means 40 and the receiving means 42, and thus the sealing line. In this case, the supporting means 10 and 20 are attached to the bulging side surfaces of the fixtures 30 and 30 via urging means for urging both ends of the respective supporting means 10 and 20 to both ends in opposite directions. The seal line can be changed by contact.

Further, another fixing device 50 of the present invention includes:
Each supporting means 1 is formed in a mutually symmetrical shape and
0, 20 can be fitted, for example, a groove 5 having a U-shaped cross section
2 and the holding means 10,
20 can be fitted and arranged to make the seal shape variable. In this case, the straight part and the curved parts located at both ends of the straight part may be formed separately, and the fixing tools 50a and 50b formed in a plurality of different shapes may be connected to form one fixing tool 50. it can.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A heat sealing apparatus according to the present invention is provided with a plurality of holding means 10 for holding a heating means 40 such as a nichrome ribbon which can be positioned in a desired shape, and opposed to the nichrome ribbon 40 as the heating means. A supporting means 20 for supporting a heat-welding plastic film 60 between the nichrome ribbon 40 and the supporting means 20 made of heat-resistant rubber or the like to form a seal receiving base;
The fixing means 30 is provided for positioning the holding means 14 of the zero and the holding means 18 of the receiving means 42 in a desired shape.

[Supporting means 10, 20] The heating means 40
The supporting means 10 for supporting a plurality of supporting means 1 of the heating means 40 is formed so as to be capable of deforming curvature in a plane.
0 as a whole is deformed by curvature.
The seal line formed by the heating means 40 carried by the zero can be changed to a desired curvature shape. This heating means 4
In the present embodiment, the supporting means 10 for supporting the zero is formed with a support shaft 14 by projecting a pin connecting the links from one side surface of a plurality of links forming a series of chains 12 having a predetermined length. The support shafts 14 are inserted into shaft holes provided in a cylindrical support member 16 made of an insulating and heat-resistant material, and each support member 16 is rotatably supported.

A groove 18 is formed at the tip of the support member 16 so as to cross the support member 16 in the diametric direction. A heating means 40 such as a series of nichrome ribbons having a predetermined length is fitted in the groove 18. Then, each support member 1 is heated by the heating means 40.
6, a series of seal heads are formed at the widthwise edges of the heating means 40 such as a nichrome ribbon.

In the chain 12 used for the holding means 10 of the heating means 40, the pins 14 connecting the links are formed to have a length approximately double between the links in the width direction of the chain 12. With the pins 14 connected together.
Have a comb shape protruding from one side surface of each link.

The structure of the support shaft is not limited to the structure in which the pins for connecting the links are protruded as described above, and various structures such as welding a support shaft formed separately from the pins to the side surface of each link can be used. Is possible.

The plurality of support members 16 supported on the pins 14 protruding from the chain 12 are made of a heat-resistant synthetic resin, for example, an engineering plastic such as an epoxy resin, or a heat-resistant / insulating material such as glass or ceramic.
Not contacting the adjacent support member 16 and supporting member 16
The diameter of the support member 16 is set so that the distance between the outer periphery of the support member 16 and the support member 16 is about 0.5 to 1.5 mm. In this embodiment, the distance between the centers of the support members 16 and therefore the pins 14 is set to about 12 mm, and the diameter of the support members 16 is about 12 mm and the length is about 23 mm.
The distance between the adjacent support members 16 is set to be less than 1 mm. In this manner, by providing the support member 16 for supporting the nichrome ribbon 40 with a small interval, the displacement of the nichrome ribbon 40 when the supporting means 10 of the heating means 40 is deformed is prevented, and the receiving rubber described later is securely formed. It is configured so as to be able to face and abut with 42.

Further, the width of the groove 18 formed at the tip of the support member 16 is set to about 1 mm, and a nichrome ribbon 40 having a width of 5 mm and a thickness of about 0.1 mm to 0.2 mm is inserted into the groove in the width direction. The nichrome ribbon 40 is fitted and bridged to the support member 16.

When the chain 12 is deformed into, for example, a semicircle in a state where the nichrome ribbon 40 serving as the heating means is carried on the carrying means 10 of the heating means 40 having the above-described structure, the link of the link of the chain 12 is formed. A support member 16 supported by a pin 14 projecting from one side moves according to the shape of the deformed chain 12. Therefore, the nichrome ribbon 40 carried on the upper end of the support member 16 follows the semicircular chain 12 and has a similar curvature.

The nichrome ribbon 40 carried by the support member 16 has a flexibility generally having the same elasticity and resilience as a leaf spring, and a force for restoring the deformed chain 12 to a straight line. Works. Due to the presence of the restoring force, the adjacent links of the chain 12 are prevented from being bent sharply around the pin 14, and the nichrome ribbon 40 is prevented from being partially linearly bent.

The groove 18 of the support member 16 rotatably supported by the pin 14 has a polygonal shape formed by joining a number of straight lines as shown in FIGS. 3A and 3B. The nichrome ribbon 40 is curved in each groove 18 by a width corresponding to the thickness direction of the nichrome ribbon 40 included in the groove 18, and has a beautiful curved shape as shown in FIGS. 3A and 3B. Be transformed.

The formation of the groove 18 wider than the thickness of the nichrome ribbon prevents the nichrome ribbon 40 from jumping out of the groove 18 even when the nichrome ribbon 40 expands due to heat. This is also advantageous in that it can be performed. However, the thermal expansion of the nichrome ribbon 40 is preferably prevented by a spring or the like (not shown) as shown in FIG.
(A), the nichrome ribbon 40 is pulled from both ends in opposite directions indicated by arrows in FIGS. 3 (B) and 4,
Apply tension to remove slack.

The heat-sealable plastic film 6 together with the nichrome ribbon 40 is opposed to the nichrome ribbon 40 and the holding means 10 supporting the nichrome ribbon 40.
Receiving means 42 formed of heat-resistant rubber or the like for holding
Are carried by the carrying means 20 and arranged.

The structure of the supporting means 20 of the receiving means 42 is substantially the same as the structure of the supporting means 10 of the heating means 40. However, the structure of the supporting member 26 of the receiving means 42 is slightly different due to the difference in the object to be supported. different.

The groove provided at the tip of the support member 26 of the receiving means 42 has a width of about 5 mm or less and a depth of about 3 mm, which is larger than the groove 18 of the support member 16 of the heating means 40. A receiving rubber 42 made of a series of, for example, heat-resistant rubber and having a rectangular cross section of about 5 mm × 5 mm is fitted into the groove, and each support member 26 is cross-linked by the receiving rubber 42.

As described above, by making the receiving rubber 42 thicker than the nichrome ribbon 40, the nichrome ribbon 40 can be reliably received even if the curvature between the nichrome ribbon 40 and the receiving rubber 42 is slightly shifted. The heat-welding plastic film 60 can be reliably welded and blown by being brought into contact with the rubber 42. In particular, since the heating means 40 has a ribbon shape, the nichrome ribbon 40
Although repeated use may cause a slight wavy habit, even in such a case, the widely formed receiving rubber 42 and the nichrome ribbon 40 surely come into contact with each other.

Each support member 26 of the receiving rubber 42 is
Unlike the above-mentioned support member 16 of the heating means 40, it is not necessary to form it with an insulating material.

[Fixing Tool] Each of the plurality of supporting means 10 of the heating means 40 and the plurality of supporting means 20 of the receiving means 42 having the above-mentioned structure is a state in which the nichrome ribbon 40 and the receiving rubber 42 are supported. Are positioned with a certain curvature deformation shape in a vertically symmetric shape.

And a supporting means 10 for the heating means 40;
Positioning is performed by the fixtures 30 and 50, respectively, so that the series of shapes of the holding means 20 of the receiving means 42 do not restore linearly due to the elasticity of the nichrome ribbon 40 or the receiving rubber 42.

FIGS. 3 and 4 show an example of the fixture 30 or 50.
Shown in Fixture 30 shown in FIGS. 3A and 3B
A fixing piece 32 is provided on the side surface at both ends in the longitudinal direction of a strip-shaped metal leaf spring, and a screw or the like is inserted into a fixing hole 34 formed in the fixing piece 32 so that the interval between the fixing pieces 32 is not shown. The fixture 30 is configured so as to obtain a curved shape having a desired curvature by positioning the fixture at appropriate intervals, and the supporting means 10 is provided on the bulging side surface of the leaf spring-like fixture 30. , 20 are brought into contact with each other, and the supporting means 10,
The both ends of 20 are urged toward each other by tension springs (not shown) so that the holding means 10 and 20 can be positioned by following the curvature deformed shape of the fixture 30.

The holding means 10 and 20 are fixed to the centers of the chains 12 and 24 in the longitudinal direction at the center of the swelling side surface of the fixing tool 30 by a detachable stopper or the like.
It is also possible to configure so as to prevent displacement with the fixture 30.

As described above, the chains 12, 22 are positioned by following the curvature deformed shape of the leaf spring-shaped fixing device 30, that is, by bending the leaf spring-shaped fixing device 30, and By determining the width between both ends of the fixture 30, the holding means 10 and 20 are made to have the same shape as the fixture 30 having an arc shape or a shape including an arc shape having a curvature corresponding to the distance between both ends. It can be deformed and positioned, so that the series of nichrome ribbons 40 and the receiving rubber 42 can be deformed into a similar shape.

The supporting means 10 for the nichrome ribbon 40
By using the leaf spring-like fixing device 30 of the same length for both the holding means 20 and the receiving rubber 42, if the distance between both ends of the leaf spring-like fixing device 30 is the same, and fixed, the nichrome ribbon 40 Of the supporting means 12 and the supporting means 20 of the receiving rubber 42 can be easily deformed into a symmetrical shape.

Another embodiment of the fixture 50 is shown in FIG. The fixing device 50 shown in FIG. 4 is a grooved fixing device 50 provided with a groove 52 having a U-shaped cross-section that can be fitted with at least the chains 12 and 22 of the support means 10 and 20, and is formed by press molding or the like. By fitting the chains 12 and 22 of the holding means 10 and 20 into grooves 52 which have been previously processed into a shape including an arc shape having a desired curvature, the holding means 10 has the same shape as the grooved fixture 50. , 20 can be deformed and positioned.

The grooved fixture 50 is a linear fixture 5
By combining fixtures of different shapes such as 0b or curved fixtures 50a, 50a, it is possible to obtain a fixture 50 having an appropriate shape as shown in FIG. Then, at least the chains 12, 22 of the holding means 10, 20 are fitted into the grooves 52 of the fixture 50 formed by the above-described combination, so that the nichrome ribbon 4 is formed.
0 and the receiving rubber 42 each have a shape corresponding to the shape of the fixture 50.

Incidentally, connecting grooves or connecting projections for facilitating connection with other fixing tools can be provided at both ends of the individual fixing tools 50a and 50b.

Leaf spring-shaped fixtures 30, 3 for positioning and fixing
By adjusting the distance between the fixing pieces 32, 32, the supporting means 10 for supporting the heating means 40 and the supporting means 20 for supporting the receiving means 42 are respectively brought into contact with the fixtures 30, 30, and positioned as described above. Nichrome ribbon 40 and receiving rubber 4
2 is a symmetrical shape having an arbitrary curvature or a shape including an arc.

Alternatively, the combination of the grooved fixtures 50a and 50b may be changed to make the shape of the fixture 50 an appropriate shape such as a straight line, an arc, or a combination of a straight line and an arc. The holding means 1 is provided in the groove 52 of the fixture 50.
The nichrome ribbon 40 and the receiving rubber 42 supported by the holding means 10 and 20 are deformed, positioned and fixed in an appropriate shape by fitting the chains 12 and 22 of 0 and 20 to form heat seals and seal cuts. Set.

The holding means 10 for the nichrome ribbon 40,
The holding means 20 of the receiving rubber 42 and the fixing members 30,
Numeral 50 is disposed so as to face up and down, and at least one of the holding means 10 and 20 is positioned and fixed to an elevating device (not shown) so as to be movable up and down.

The heat-sealable plastic film 60 such as the open end of the packaging bag filled with the contents is placed between the nichrome ribbon 40 and the receiving rubber 42 of the heat sealing apparatus of the present invention thus constructed. Supporting means 2 for rubber 42
Decrease 0.

Receiving rubber 42 lowered with the supporting means 20
When the heat-welding plastic film 60 is sandwiched between the nichrome ribbon 40 and the receiving rubber 42, a switch (not shown) is turned on, and the nichrome ribbon 40 is energized for a set time, and the nichrome ribbon 40 is heated. Then, the heat-welding plastic film 60 sandwiched between the nichrome ribbon 40 and the receiving rubber 42 is welded and blown. In this embodiment, energization of the nichrome ribbon 40 is performed at a voltage of 20 to 30 V for 1 to 2 seconds.

After energizing the nichrome ribbon 40 for a set time, the heat-welding plastic film 60 is further sandwiched between the receiving rubber 42 and the nichrome ribbon 40 and cooled. Thereafter, the holding means 20 of the receiving rubber 42 in the lowered state is lifted by the lifting device, and is welded or welded / fused.
0 can be taken out.

The heat-sealable plastic film such as the packaging bag which can be taken out is taken out manually or by a transport device (not shown), and after the new heat-sealable plastic film is loaded, the above operation is repeated. Welding or welding / fusing is performed.

[0046]

According to the structure of the present invention described above,
In the heat seal device of the present invention, the seal shape can be changed arbitrarily and arbitrarily, so that a single heat seal device can seal various shapes. Therefore, not only can a beautifully finished packaging conforming to the shape of the packaged object be performed, but if this is used in the pre-stage of the heat shrink packaging, the shrinkable film can be adhered to various sizes and shapes of the packaged object. Ideal heat shrink wrapping that does not leave one and the like can be performed.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken along line II-II of FIG.

3A and 3B are plan views showing an example of a fixture used in the present invention, wherein FIG. 3A shows a state where the curvature is reduced, and FIG. 3B shows a state where the curvature is increased.

FIG. 4 is a plan view showing an example of a fixture used in the present invention.

5A and 5B are schematic views of a main part of a conventional heat sealing device, wherein FIG. 5A is a front view, and FIG. 5B is a cross-sectional view taken along line BB of FIG.

6A and 6B are schematic diagrams of a main part of a conventional heat sealing device, in which FIG. 6A is a plan view of a seal base portion, and FIG. 6B is a cross-sectional view taken along line BB of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Support means (of heating means) 12 Chain 14 Support shaft (pin) 16 Support member (of heating means) 18 Groove 20 Support means (of receiving means) 22 Chain 24 Support shaft (pin) 26 Support member (of receiving means) 28 groove 30 fixture (leaf spring-shaped fixture) 32 fixing piece 34 fixing hole 40 heating means (nichrome ribbon) 42 receiving means (receiving rubber) 50 fixture (grooved fixture) 52 groove 60 heat-welding plastic film 72 Receiving rubber 74 Crimping plate 76 Seal base 79 Insulator 80 Nichrome ribbon

Claims (6)

[Claims] 1. A heat sealing device for sandwiching a heat-welding plastic film between a heating means and a receiving means, heating the heating means to weld the sandwiched heat-welding plastic film, or welding and fusing. A heat sealing device, comprising: a fixing tool for positioning a plurality of holding means for holding a heating means and a receiving means so as to face each other in a predetermined curvature deformed shape. 2. The supporting means for supporting the heating means and the receiving means includes a chain having a support shaft protruding from one side surface of each of the plurality of links, and a cylindrical member rotatably supported by each of the support shafts. 2. The heat sealing device according to claim 1, wherein a groove is provided at a tip end of each of the support members in a diameter direction of the support member, and a heating unit and a receiving unit are fitted in the grooves. . 3. A groove is provided at the tip of each of the support members in the diameter direction of the support member, and a series of ribbon-shaped heating means and a prism-shaped receiving means are fitted in the grooves. 3. The heat sealing device according to claim 2, wherein the support members are bridged by a heating unit and a receiving unit. 4. A fixing device for positioning the deformed curvatures of the heating means and the receiving means on each of the supporting means, wherein the fixing means positions the flexible member at a desired curvature at both ends of the belt-shaped flexible member. The heat sealing device according to claim 1, wherein the heat-sealing device includes a piece, and the holding unit is arranged so as to be in contact with a bulging-side surface of the fixing tool. 5. A fixing device for positioning the shape of the holding means, wherein the fixing means is formed in a mutually symmetrical curvature deformation shape, and is provided with a groove capable of fitting each of the holding means. 3. The heat sealing device according to 1 or 2. 6. The heat sealing device according to claim 5, wherein the fixing tool is formed by connecting a plurality of fixing tools including a straight line portion and a curved portion to form one fixing tool.