JP3739131B2 - Sealer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sealer that heat-seals a film that covers a package to be packaged.
[0002]
[Prior art]
Conventionally, this type of sealer has a pair of sealer bodies 50 and 51 which are sealed with a sealer shaft so that a film (wrapping material) covering the package can be sandwiched and sealed by heating as shown in FIG. A device that is provided so as to be rotatable in synchronism with 52 is known. The seal portions of the sealer bodies 50 and 51 are generally composed of a metallic rigid body.
The sealer is integrally attached to a so-called pillow wrapping machine, and is used when pillow-wrapping a packaged body with a packaging material.
[0003]
[Problems to be solved by the invention]
However, the sealing work using the conventional sealer has the following problems.
[0004]
That is, when the thickness dimension of the packaging material is, for example, 50 μm, the center seal portion formed by superimposing the both edge portions of the film 54 is overlapped as shown in FIG. The thickness is 200 μ, the other parts are two layers, and the wall thickness is 100 μ. Therefore, when sealing with the above-described conventional sealer, in order to seal the two-layered portion, the four-layered portion must be crushed below the thickness of the two-layered layer. As a result, the four-layered portion was destroyed by the pressing force, and there was a defect that a reliable seal could not be obtained and a seal failure occurred.
[0005]
In particular, when the packaging material is made of a composite film such as paper or aluminum foil, with the above-mentioned rotary type horizontal sealer, if the sealing time is short, the overlapping thickness of the films differs (two sheets near the four-layer stack). In order to improve the partial sealability, the sealing operation must be performed by applying high temperature and high pressure, and the four-layered portion is easily damaged. As a result, such a composite film had to be sealed over time.
[0006]
The present invention has been made in view of the above-described conventional problems, and is intended to reliably seal the packaging material to improve the sealing state, and further to speed up a series of packaging operations in the packaging machine. Is an issue.
[0007]
[Means for Solving the Problems]
In the present invention , means for solving the above-described problems are configured as follows. That is, in a sealer provided with a pair of sealer bodies 14 and 15 that sandwich and seal the packaging material 4 for covering the package 7 by heating,
The sealer body 14, 15, sealing member 25 that the thermal conductivity is made of good flexibility of the metal material, 26 support protrusions 23a for supporting the, 23b are formed respectively, the support projections 23a, 23b are The seal members 25 and 26 are formed between relief notches 22a and 22b formed in the sealer bodies 14 and 15 to allow bending of the seal members 25 and 26 , respectively, and one of the support protrusions 23a is formed of the other relief notch. 22b , the other support projection 23b corresponds to one of the relief cutouts 22a , and at least one of the sealing members 25 , 26 is provided, and when sealing the packaging material 4 , the support projections 23a, the the recess 30, 30 formed respectively on 23b sealing member 25, 26 is the sealing member 25 at and slidably contact each state which sandwiches freely bend the packaging material 4, So that the 26 can mesh with each other Composed .
[0008]
With this configuration, when the packaging material 4 is sandwiched by the seal member 25, 26 at the time of sealing the packaging material 4, the sealing member 25, since 26 is flexible, superposed wrapper 4 meat In the thick part, the bending between the seal members 25 and 26 increases, and on the contrary, in the thin part, the bending decreases, so that it can respond flexibly. Therefore, even if the thickness of the packaging material 4 is increased, sealing can be performed with the same pressing force and temperature as those of the thin portion, and excessive sealing pressure is applied to the thicker portion and the packaging material is applied. 4 is not crushed and the packaging material 4 can be reliably sealed.
In addition, since the sealing members 25 and 26 slidably contact the recesses 30 and 30 formed in the support protrusions 23a and 23b so as to be engaged with each other, the packaging material 4 is sandwiched between the sealing members 25 and 26 . Even when the positions are shifted, the seal members 25 and 26 mesh with each other, so that the positions of the seal members 25 and 26 are corrected, and the packaging material 4 can be reliably sealed.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 5 show an embodiment of the present invention. In FIG. 5, reference numeral 1 denotes an automatic wrapping machine, and for example, a laminate film or a thick shrink film fed from a take-up roll 3, paper, aluminum foil, or the like The film 4 such as the composite film is formed into a cylindrical shape by the former 5 and the packaged body 7 conveyed by the conveying device 6 is encapsulated by the cylindrical film 4, and both side edges of the film 4 are formed. The film 4 is sealed by a pair of vertical sealers 8, and the film 4 conveyed to the feed conveyor 6 a is melt-sealed to a predetermined length by the horizontal sealer 9, and then shrink-wrapped via the shrink tunnel device 2.
[0010]
As shown in FIG. 3, the horizontal sealer 9 is composed of a pair of an upper sealer portion 10a and a lower sealer portion 10b. The upper and lower sealers 10a and 10b are rotatably provided in synchronism with sealer shafts 11 and 12, which are arranged in a direction perpendicular to the transport direction a of the package 7 and in parallel with a predetermined interval. In addition, sealer bodies 14 and 15 that are appropriately heated by a heater (not shown) are fixed to the sealer shafts 11 and 12 along bolts 17 along the longitudinal direction of the sealer shafts 11 and 12.
[0011]
Further, as shown in FIG. 2, long grooves 18 are formed at the tips of the sealer bodies 14 and 15 along the longitudinal direction thereof, and a plate-shaped cutting blade 20 is fitted into the long groove 18 of the upper sealer body 14. On the other hand, in the long groove 18 of the lower sealer body 15, a plate-like receiving blade 21 with which the cutting blade 20 contacts is fitted.
[0012]
22a and 22b are escape cutouts formed so as to leave a plurality of support protrusions 23a and 23b on the front end surfaces of both sealer bodies 14 and 15, and the escape cutouts 22a and 22b are the cutting blade 20 or the receiving blade 21. It is provided on both sides. Further, the support protrusion 23a of the upper sealer body 14 is positioned substantially at the center of the notch 22b of the lower sealer bodies 14 and 15, and the support protrusion 23b of the lower sealer body 15 is the same as that of the upper sealer body 14. Therefore, the support protrusion 23a and the support protrusion 23b are provided at positions shifted from each other.
[0013]
25 and 26 are metal seal bars made of a round bar having good thermal conductivity, such as spring steel, which slides on the tips of the sealer bodies 14 and 15 and on the recesses 30 formed in the support protrusions 23a and 23b. It is provided so that it can move freely.
[0014]
Further, a plurality of seal bars 25 and 26 are provided at the front and rear portions with respect to the cutting blade 20 or the receiving blade 21. That is, three seal bars 25 are provided at the front and rear portions of the cutting blade 20 of the upper sealer body 14 so as to contact each other, while the front and rear portions of the receiving blade 21 of the lower sealer body 15 are Two seal bars 26 are provided so as to be engaged with the seal bar 25. The center line L of each seal bar 25, 26 is on an arc with a radius of curvature centering on the rotational center of each sealer shaft 11, 12.
[0015]
Further, one end portions 25a and 26a of the seal bars 25 and 26 are fixed to one end portions 14a and 15b of the sealer main bodies 14 and 15, respectively. The means for fixing the seal bars 25 and 26 is not particularly limited, and fastening means using an adhesive or bolts can be used. The other end portions 25b and 26b of the seal bars 25 and 26 are only in contact with the other end portions 14b and 15b of the seal bars 25 and 26, and are slidable in the axial direction of the seal bars 25 and 26. Moreover, each seal bar 25, 26 is linear due to its own elastic force.
[0016]
Next, usage examples and operations of the embodiment in the above configuration will be described.
First, both end portions 4a of the film 4 formed into a cylindrical shape by the former 5 are center-sealed by the vertical sealer 8 at the central position of the cylindrical shape.
[0017]
Furthermore, the package body 7 is conveyed into the cylindrical film 4, and both sides 4b of the film 4 are folded into a gusset shape. Next, the packaged body 7 is transported together with the film 9 between the horizontal sealers 9, but the upper and lower sealer bodies 14 and 15 are rotated at a predetermined rotational speed. The part will be sealed from above and below.
[0018]
That is, the upper piece 4c of the film 4 is pressed by the upper heated seal bar 25, and the lower piece 4d is pressed by the lower heated seal bar 26, respectively. 26 is heat sealed. At this time, both sides 4b of the film 4 are in a gusset shape, so that four sheets are overlapped, and the center-sealed both end portions 4a are folded back to the lower piece 4d side, and similarly four sheets are stacked. The thickness of the entire film 4 is thicker than the two-layered portion.
[0019]
When the seal bars 25 and 26 hold the film 4 in this state from above and below, the seal bars 25 and 26 have flexibility over the entire width of the film 4, so that the thick part of the film 4 that is stacked on a plurality of sheets is stacked. Then, mutual bending becomes large, and on the contrary, in a thin part, the bending becomes small.
[0020]
Therefore, even if the thickness of the film 4 is increased, the film 4 can be sealed with the same pressing force and temperature as those of the thin portion. The film 4 is not crushed and can be reliably sealed under substantially uniform conditions over the entire width of the film 4.
[0021]
Moreover, since the upper and lower seal bars 25 and 26 are arranged so as to mesh with each other, even if the positions of the seal bars 25 and 26 are shifted, the upper and lower seal bars 25 and 26 Since the two mesh with each other, the positions of the seal bars 25 and 26 are corrected, and the film 4 can be securely held between the upper and lower seal bars 25 and 26. Further, since the support protrusions 23a and 23b for supporting the seal bars 25 and 26 are alternately provided in the upper and lower sides, there is no problem with the bending of the seal bars 25 and 26.
[0022]
In addition, the seal bars 25 and 26 seal the film 4 as described above, and at the same time, the film 4 is melted by the cooperation of the cutting blade 20 and the receiving blade 21, and then passes through the shrink tunnel device 2 as shown in FIG. The packaging bodies 32 shown in a) are sequentially formed.
[0023]
Although it is possible to use heat-resistant rubber having elasticity as the sealing member, heat-resistant rubber has poor wear resistance, low thermal conductivity, and easily deteriorates due to pressure and heat. Is expensive. Compared to this, the above problem can be solved by using metallic seal bars 25 and 26.
[0024]
The present invention is not limited to the above-described embodiment. For example, as shown in FIG. 4 (b), the portion where the center-sealed film both ends 4a and the gusset portion 34 overlap is formed by stacking six films 4. However, even in such a case, the seal bars 25 and 26 are arbitrarily curved, and the film 4 can be sealed in the same manner as described above.
[0025]
In the above embodiment, the rotary sealer is exemplified. However, as shown in FIG. 6, the upper and lower sealer bodies 14 and 15 may be configured to be spaced apart from each other or approach each other. Further, the separation direction can be an arbitrary direction such as a horizontal direction in addition to the vertical direction.
[0026]
Moreover, the sealer is not necessarily provided with a cutter means, and the sealed film 4 may be cut by a separate cutter device.
[0027]
Further, the number of the seal bars 25 and 26 is not limited to the above number. For example, the number of the seal bars 25 and 26 may be two on the upper side and one on the lower side. In addition to the rod-shaped body, a flat plate having a rectangular cross section is also possible, and it is also possible to provide only one of the sealer main bodies 14 and 15, and is not particularly limited. Of course, the packaging form is not limited to the above embodiment.
[0028]
【The invention's effect】
In the present invention, since the sealer body is provided with a flexible sealing member, the sealing member can be arbitrarily curved over the entire width of the sealing portion according to the sealing form of the packaging material to be sealed. As a result, the packaging material can be prevented from being damaged, and the sealing performance can be improved.
[0029]
In addition, even when the sealer is a rotary horizontal sealer and the sealing time is short, the sealing performance is improved at locations where the composite film overlap thickness is different, and the speed of the packaging operation can be easily achieved. There is an advantage that can be.
[0030]
In addition, when the seal member is made of a metallic bar, it can improve the thermal conductivity, has excellent wear resistance, is hardly deteriorated by pressure and heat, can be used for a long time, and has a cost as a consumable part. Become cheap.
[Brief description of the drawings]
1A and 1B show an embodiment of the present invention, in which FIG. 1A is a cross-sectional front view of an essential part showing a sealed state of a film, and FIG.
FIG. 2 is a cross-sectional side view of an essential part showing a sealed state of the film.
FIG. 3 is a front view of the sealer body and the seal bar.
4A is a perspective view of a package, and FIG. 4B is a cross-sectional view of a film.
FIG. 5 is a side view showing the entire packaging machine.
FIG. 6 is a sectional front view showing another embodiment of the present invention.
7A and 7B show a conventional example, in which FIG. 7A is a side view of a sealer body, and FIG.
[Explanation of symbols]
4 ... Film (wrapping material), 7 ... Packaged body, 14, 15 ... Sealer body, 25, 26 ... Seal bar (seal member)

Claims (1)

In a sealer comprising a pair of sealer bodies (14), (15) sandwiching a packaging material (4) for covering a packaged body (7) and sealing by heating,
The sealer bodies (14) , (15) are provided with support protrusions (23a) , (23b) for supporting seal members (25) , (26) made of a flexible metal material having good thermal conductivity. The support protrusions (23a) and (23b) are relief cuts formed on the sealer bodies (14) and (15) to allow the seal members (25) and (26) to bend. Formed between the notches (22a) and (22b) , one of the support protrusions (23a) is formed in the other relief notch (22b) , and the other support protrusion (23b) is formed in one of the relief notches (22a) respectively , and at least one of the sealing members (25) , (26) is provided, and when sealing the packaging material (4) , the support protrusions (23a) , The sealing members (25) , (26) are slidably in contact with the recesses (30) , (30) formed in (23b) , respectively, and the packaging material (4) is held in a curved manner. The sea Member (25), sealer, characterized in that configured to engage each other to each other (26).

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