JPH11320712A - Pressurizing part for paper container heat-sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To deal with a corner side seal flap with a small width and a corner side seal flap with a large width without the necessity to replace a part by mounting a protrusion for a large width and a protrusion for a small width side by side corresponding to the large width end part and the small width end part of the side seal flaps for a paper container respectively. SOLUTION: A protrusion 5 for a large width for pressing the side edge of the lower end part of a side seal flap for a large width carton, and a protrusion 82 for a small width for pressing the side edge of the lower end part of the side seal flap for a small width carton, are provided on the pressurizing face 71 of a bottom seal pad 7. The protrusion 5 for a large width is provided in such a manner that it holds the side edge of the lower end part of the side seal flap in an orthogonal direction with the side edge and straddling the side edge. On the other hand, the protrusion 82 for a small width is provided in such a manner that it holds the side edge of the lower end part of the side seal flap in a parallel direction width the side edge and along the side edge and not straddling the side edge. Consequently, it is possible to easily manufacture a skived carton with a small width which is advantageous in terms of cost, with ensured high sealing properties.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided in a bottom heat sealing device and a top heat sealing device of a filling machine for a paper container having a gable top formed of a container material in which the front and back surfaces are covered with a thermoplastic resin. Related to pressurized parts.

[0002]

2. Description of the Related Art Paper containers 1 and 2 represented by a milk carton as shown in FIG. 10 (showing two types of paper containers) are container materials (paperboard materials) 1 in which the front and back surfaces are entirely covered with a thermoplastic resin.
0,20, and the gable tops 1a, 2a
Are provided with foldable pouring portions 1b and 2b, or a separate pouring port (not shown).

[0003] Of the paper containers 1 and 2, the paper container 1 has a wide side seal flap 11 as shown in FIG. This paper container 1 is referred to as a wide carton 1).
As shown in FIG. 5, the paper container 2 has a narrow side seal flap 21 having a width of only a portion indicated by a chain line L1 as shown in a cross-sectional view of its body (hereinafter, this paper container 2 is referred to as a narrow carton 2). Is shown. In the wide carton 1 and the narrow carton 2, approximately half of the thickness of the tip side of the side seal flaps 11 and 21 is set to a predetermined width (for example, capacity 1000) along the edge.
In some cases, skiving is performed by shaving the entire length of the carton with a carton of about 10 mm), folding the thinned portion in half, and heat-sealing the other ends of the container materials 10 and 20 (FIG. 4). , FIG. 5). Such special processing is performed by the side seal flaps 11 and 2.
Without exposing the cross section of the paper layer to the edges 11a and 21a of
This is to prevent liquids and the like in the cartons 1 and 2 from penetrating into the paper layer from the cross section of the paper layer.

FIG. 10 shows side seal flaps 11 and 21 and their edges 11 in the side seal area of the body.
a, 21a, the upper ends 11U, 21U of the side seal flaps 11, 21 and their edges 11Ua, 21Ua in the top seal area, and the lower ends 11B, 21B of the side seal flaps 11, 21 in the bottom seal area.
And its edges 11Ba, 21Ba.

As shown in FIG. 11, such paper containers 1 and 2 are carton blanks 1X and 2X side-sealed on a filling machine 3, bottom-sealed by a bottom heat-sealing device 31, and open upward. Bottom square tubular body 1X ',
2X ', and the bottomed rectangular cylindrical bodies 1X', 2X 'are filled with the contents of liquid or the like by the contents filling device 32, top-sealed by the top heat sealing device 33, and completed, as shown in FIG. Wide carton 1 and narrow carton 2. The contents of these cartons 1 and 2 are almost always liquid. Especially when filling with highly permeable liquid, skived processing is performed as a measure against liquid leakage.

[0006] The skived process is performed by a filling machine 3 shown in FIG.
The carton blanks 1X and 2X, which are formed in the carton blanks 1X and 2X in the upstream production process, are already side-sealed in the carton blanks 1X and 2X that are applied to the filling machine 3. Therefore, the side seal width and the presence or absence of skived processing are specified. ing.

In the top seal and bottom seal processes in the filling machine 3, the ends of the side seal flaps 11 and 21 in the carton become stepped portions to create a gap in the seal portion, making the seal unstable. As a measure for ensuring the completeness of the seal of the part, the measures conventionally taken in the filling machine 3 include a pressurized part (hereinafter, referred to as a pressurized part) of the bottom heat seal device and the top heat seal device.
In the bottom heat seal device, it is called a bottom seal pad, and in the top heat seal device, it is called a top seal jaw. The pressing projections are provided at several places on the pressing surface and slightly protrude from the pressing surface.

FIGS. 12 and 13 show the relationship between the bottom heat sealing device of a conventional filling machine and a wide carton.

FIG. 12 is a front view of a pressing part of a bottom heat sealing device of a conventional filling machine, that is, a pressing surface 41 of a bottom seal pad 4. It is shown with a circle surrounding the protrusion 5. The presser projection 5 is usually provided at the upper end of a columnar pin having a circular cross section, and this columnar pin is embedded in the pressing surface 41 except for the upper end, and the upper end is shaved to form the presser projection 5. Therefore, when this is viewed from the front, it looks like a projection is formed in the circle.

The pressing surface 41 has a different thickness in a portion corresponding to the degree of overlap of the container materials in the carton bottom, and several straight lines indicate the step. The L-shaped area 42 is the thinnest area of the pressing surface 41, and the four areas 43 are slightly thicker than this, and the two areas 4
4 is the thickest. Steps are formed at the boundaries of each area,
The step is related to the thickness of the carton material, and the thickness of the carton material is generally determined in relation to the carton capacity. The bottom seal is performed by a set of bottom heat sealing devices including a bottom seal pad 4 having a holding projection 5 and a pressurized component called a mandrel cap corresponding to the bottom seal pad 4.

FIG. 13 is an inner view of the bottom of the container of the conventional wide carton 1 which is sealed by the bottom seal pad 4 of the conventional bottom sealing device. The lower end 11B of the side seal flap 11 and the lower end 11B The portion where the edge 11Ba is pressed in a direction orthogonal to the above is partially cut away. That is, in the case of the conventional bottom seal pad 4, the pressing protrusion 5 having a linear shape is formed on the pressing surface 41 by the lower end portion 11 of the side seal flap 11.
The side seal flap 11 is provided in a direction perpendicular to the edge 11Ba as shown in the figure, or in a direction parallel to the outer edge of the lower edge 11B of the side seal flap 11 and the portion immediately outside the edge 11Ba. The mandrel cap is omitted.

FIGS. 14 to 16 show the relationship between the conventional top heat sealing device and the wide carton 1. FIG.

FIG. 14 shows a pressing part of the conventional top heat sealing apparatus, that is, a pressing surface 61 of the top sealing jaw 6 and pressing projections 62 and 63 having a linear shape. Presser projection 62
Are provided in a direction parallel to the width of the side seal flap 11 of the wide carton 1 (for example, 15 mm in a 1000 ml capacity container), and the presser projection 63 is for intermediate pressing in the width direction of the side seal flap 11 of the wide carton 1. It is. The top seal is performed by a set of top heat sealing devices consisting of a pressurized component, ie, a top seal jaw 6 and a pressurized component facing the top seal jaw 6.

FIG. 15 is a plan view of the wide carton 1 to be top-sealed by the top heat sealing device in a sealing state. FIG. 16 is a pressing projection 62 provided on a pressing surface 61 of a conventional top seal jaw 6. , 63 (shaded area in the figure) and side seal flap 1 of wide carton 1
1 is an exploded view schematically showing a relationship with an upper end of a side seal flap 11;
Of the side edge 11Ua of the side seal flap 11, and the pressing protrusion 63 presses a substantially middle portion of the upper end 11U of the side seal flap 11 in the width direction.

In FIGS. 12 to 16, a chain line L2
Are pressing protrusions 5 on the pressing surface 41 of the bottom seal pad 4, pressing protrusions 62 on the pressing surface 61 of the top seal jaw 6, upper and lower end portions 11U of the side seal flap 11 of the carton 1,
This shows that the positions of the edges 11Ua and 11Ba of 11B are aligned at the same position at each sealing.

The pressurized part of the sealing device of the filling machine is configured to heat the resin on opposite sides of the container material constituting the seal so as to press the melted resins against each other so that the other resin forms a pair with the other. Between the pressurized parts, the folded container material is sandwiched and pressed, and when the sealing area is cooled, the molten thermoplastic resin layer is solidified and united to keep the outer shape of the completed container constant. This has the effect of completely preventing the penetration of the liquid inside and outside the container in the sealing area.

The pressing projections 5 and 62 are provided on the pressing surfaces 41 and 61 of the bottom seal pad 4 and the top seal jaw 6 in order to locally exert the action of the pressing surface more strongly. Usually, a plurality of parts are provided at locations where a presser is required more strongly than usual. The number of container materials sandwiched by the sealing device is three or four around the pin of the present invention at the bottom seal part (FIG. 13), and four at the top seal part around the outer edge of the side seal flap. 5
Since there is a step like a sheet (FIG. 15), the edges of the upper and lower ends of the side seal flaps need to be locally stronger than usual.

[0018]

The wide carton 1 having a width of about 15 mm will be described with reference to a carton side seal flap 11 having a capacity of 1 liter.

On the pressing surface of the conventional top seal jaw,
As shown in FIG. 14, a pressing projection 62 is provided at a position corresponding to the width of the side seal flap 11 of the wide carton 1 at a position corresponding to the edge 11 </ b> Ua of the upper end 11 </ b> U of the side seal flap 11. Therefore, when the skived carton (wide skived carton) is to be hanged on the filling machine, the width of the side seal flap is adjusted to the pressurized part of the sealing device of the filling machine, and the width is increased after skiving. That is, it is necessary to increase the width of the side seal flap. This means that an extra amount of paper is used, and the wide skived carton requires an extra paper cost in addition to the special processing cost of skived processing.

On the other hand, if skiving is performed without changing the side seal flap width of 15 mm in a wide skived carton, the edge of the seal seal flap 11 is skived with a width of about 10 mm. About 15- (10１５2)
= 10 mm, so that it is not possible to use the filling machine, and it is necessary to separately prepare a sealing device corresponding to this narrow width. However, in the conventional filling machine, only the sealing device for a wide carton is prepared because of the troublesome work of preparing and replacing two types of sealing devices. The width of the flap is set to about 15 mm (wide skived carton) after skiving as described above, in accordance with the pressure component of the sealing device of the filling machine. (FIG. 4).

[0021] It is an object of the present invention to provide a pressurized part of a heat seal device for a paper container which can accommodate narrow and wide side seal flaps without replacing parts.

[0022]

SUMMARY OF THE INVENTION According to the present invention, there is provided a bottom heat sealing apparatus for a filling machine for a paper container having a gable top formed of a container material coated with a thermoplastic resin on the entire front and back surfaces. A pressure component provided in the top heat sealing device, wherein a wide projection and a narrow projection are provided in parallel with the wide end and the narrow end of the side seal flap of the paper container, respectively. It is characterized by the following.

As described above, by providing the wide-width projection and the narrow-width projection in correspondence with the wide-width end and the narrow-width end of the side seal flap of the paper container, a wide width side seal flap is provided. Even with narrow side seal flaps, the edges of the side seal flaps can be held down for both without replacing parts.

According to a second aspect of the present invention, the height of the narrow projection is set lower than the width of the wide projection.

As described above, the height of the narrow projection from the pressing surface is lower than that of the wide projection. Therefore, even when the edge of the wide side seal flap is pressed by the wide projection, the narrow projection is narrow. The wide projections can satisfactorily press the side seal flaps near the outside of the edge without excessive pressing by the width projections being applied to the side seal flaps.

[0026]

FIG. 1 is a front view of a pressing surface 71 as an example of an embodiment of a bottom seal pad 7 which is one of the pressing parts of a heat sealing device for a paper container according to the present invention. The pressurizing surface 71 of the bottom seal pad 7 has a wide projection 5 for pressing the lower edge of the side seal flap of the wide carton 1 and an edge of the lower end of the side seal flap of the narrow carton 2. A narrow width projection 82 for holding down is shown. The wide projection 5 presses the edge of the lower end of the side seal flap in a direction perpendicular to the edge and across the edge, and the narrow projection 82 holds the edge of the lower end of the side seal flap. , In such a direction as to be parallel to the edge and to be pressed along the edge so as not to straddle the edge.

The height of these projections is too high and the pressing force becomes too strong, so that a hole is formed in the thermoplastic resin layer such as polyethylene on the surface of the carton. It is determined that there will be no occurrence. The height of the narrow projection 82 from the pressing surface is set slightly lower than that of the wide projection 5. In particular,
The narrow projection 82 preferably has a height of 0.3 to 0.65 mm, and the wide projection 5 preferably has a height of 0.45 to 0.75 mm. For this reason, even when the edge of the wide side seal flap is pressed by the wide projection 5, excessive pressing of the side seal flap by the narrow projection 82 is prevented, and good pressing can be obtained.

In particular, the narrow projection 82 is pressed so that the edge at the lower end of the side seal flap is pressed in a direction parallel to the edge and along the edge so as not to straddle the edge. With this arrangement, a sufficient pressing force for eliminating the gap is applied to the gap formed in the seal portion with the end of the side seal flap serving as a step.

The other pressing projections on the pressing surface 71 are omitted. A line composed of a plurality of straight lines indicates a step due to a partial difference in the thickness of the bottom seal pad 7 and is the same as the conventional one.

FIG. 2 shows the bottom inner surface of the narrow carton 2 which can be pressed down by the bottom seal pad 7 of the embodiment of FIG. 21B is a lower end portion of the side seal flap 21 having a width of about 10 mm, 21Ba is an edge of the side seal flap 21, and a place where the narrow width projection 82 is pressing the edge 21Ba in a parallel direction is shown. It is shown partially cut away.

FIGS. 3 to 5 show horizontal cross-sectional views of various cartons which can be subjected to edge pressing processing by the heat sealing apparatus of the present invention. FIG. 3 shows a wide carton 1, 11 is a side seal flap, and 11a is an edge.
FIG. 4 shows a wide carton 1 skived.
1 is the side seal flap, and 11a is the edge. FIG. 5 shows a skived narrow carton 2, 21 a side seal flap, and 21 a an edge.

Although not shown in the drawings, the heat sealing apparatus of the present invention can be applied to a narrow carton not subjected to skived processing (straightly applied).

In the filling machine 3 shown in FIG. 11, a side seal is already performed from the bottom to the top, a flat folded carton is hung, and the carton is expanded on the filling machine, and the bottom and top seals are arranged in this order. Done.

FIG. 6 is a front view showing an example of an embodiment of a top seal jaw 9 which is another one of the pressurizing parts of the paper container heat sealing apparatus according to the present invention.
Is a wide projection 101 which presses in a direction parallel to the outer edge of the upper edge of the side seal flap having a width of about 15 mm.
And a narrow-width projection 102 that presses the outer edge of the upper end portion of the side seal flap having a width of about 10 mm in a direction parallel to the outer edge. FIG. 7 shows a plan view of the skived narrow carton 2 which is top-sealed by the top seal jaw 9 at the time of sealing, where 21U is the upper end of the side seal flap 21 and 21Ua is its edge. FIG. 8 shows the positional relationship between the narrow projection 102 (hatched portion in the figure) provided on the pressing surface 91 of the top seal jaw 9 and the edge 21 Ua of the upper end 21 U of the side seal flap 21 of the narrow carton 2. FIG.
FIG. 9 shows a wide projection 101 (hatched portion in the figure) provided on the pressing surface 91 of the top seal jaw 9 and the edge 1 of the upper end 11U of the side seal flap 11 of the wide carton 1.
It is a development view which shows the positional relationship with 1Ua typically.

1 to 9, a chain line L1 is a side seal flap 21 of the narrow carton 2 and upper and lower end portions 2 thereof.
The positions of the edges 21a, 21Ua, 21Ba of 1U, 21B and the narrow projections 8 on the pressing surface 72 of the bottom seal pad 7.
2. Narrow projection 1 on pressing surface 91 of top seal jaw 9
The relationship with the position of 02 is shown. The chain line L2 is the wide carton 1
Edge 11a, 21 of side seal flap 11, 21
a and edges 11Ua, 21 of the upper ends 11U, 21U
The relation between the position of Ua and the positions of the wide projections 5 on the pressing surface 72 of the bottom seal pad 7 and the wide projections 101 on the pressing surface 91 of the top seal jaw 9 is shown.

The filling machine having the sealing device provided with the pressurized parts according to the present invention can press the edges at the upper and lower ends of the side seal flaps corresponding to various carton dimensions without requiring replacement of parts. In this example, the number of the wide projections and the narrow projections is at least two for the bottom seal pad and the top seal jaw for the wide and narrow widths, but depending on the size of the carton, the filling machine, The dimensions of the parts are also changed, and the number of the wide projections and the narrow projections is not limited to two, and an appropriate number of two or more may be selectively provided.

[0037]

As described above, according to the heat sealing apparatus provided with the pressurized component according to the present invention, the component can be switched from a normal liquid to a liquid that easily penetrates, or vice versa, at the time of switching or other cases. A conventional wide carton or a narrow carton can be set on a filling machine without replacement, and the top and bottom seal portions of the carton container can be pressurized, thereby preventing liquid leakage from the seal portion. Therefore, it is possible to easily manufacture a narrow-width skived carton container which is advantageous in terms of cost while ensuring the sealing performance, and it is possible to improve the operation efficiency.

[Brief description of the drawings]

FIG. 1 is a front view of a pressurized surface showing an example of an embodiment of a bottom seal pad which is one of pressurized parts of a paper container heat sealing device according to the present invention.

FIG. 2 is a partially cutaway plan view of an inner bottom surface of a narrow-width skived carton subjected to edge pressing processing by the bottom seal pad of FIG. 1;

FIG. 3 is a horizontal cross-sectional view of a trunk portion of a wide-width carton that can be subjected to edge pressing processing by a heat sealing apparatus according to the present invention, which is a straight pasting method.

FIG. 4 is a horizontal cross-sectional view of a body portion of a wide carton subjected to skived processing capable of performing edge pressing processing by the heat sealing device of the present invention.

FIG. 5 is a horizontal sectional view of a trunk portion of a narrow carton subjected to skived processing capable of performing edge pressing processing by the heat sealing device of the present invention.

FIG. 6 is a front view showing an example of an embodiment of a top seal jaw that is another one of the pressurized components of the heat seal device for a paper container according to the present invention.

FIG. 7 is a plan view showing a state immediately before sealing of a top seal portion of a narrow carton subjected to skived processing to be top-sealed;

8 is an upper partial development view of a narrow carton schematically showing a relationship between a narrow projection of a top seal jaw shown in FIG. 6 and an edge of an upper end portion of a side seal flap.

9 is an upper partial development view of a wide carton schematically showing a relationship between a wide projection of the top seal jaw shown in FIG. 6 and an edge of an upper end portion of a side seal flap.

FIG. 10 is a perspective view showing a paper container represented by a milk carton.

FIG. 11 is an explanatory diagram showing a schematic configuration of a filling machine.

FIG. 12 is a front view of a pressing surface of a bottom seal pad, which is one of the pressing components of the conventional paper container heat sealing device.

13 is a partially cutaway plan view of an inner bottom surface of a wide carton subjected to edge pressing processing by the conventional bottom seal pad shown in FIG.

FIG. 14 is a front view of a top seal jaw that is another one of the pressurized components of the conventional paper container heat sealing device.

FIG. 15 is a plan view showing a state immediately before the sealing of the top sealing portion of the wide-width carton to be top-sealed and directly pasted.

FIG. 16 is an upper partial development view of a wide carton schematically showing a relationship between a holding projection of the conventional top seal jaw shown in FIG. 14 and an edge of an upper end portion of a side seal flap.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wide carton 1X Carton blank in bottom seal 1X 'Square bottomed tubular body 1a Gable top 1b Folding-type pouring part 2 Narrow carton 2X Carton blank in bottom seal 2X' Squared bottomed cylindrical body 2a Gable top 2b Folding-type pouring part 11 Side seal flap 11a Edge 11B Lower end 11Ba Edge 11U Upper end 11Ua Edge 21 Side seal flap 21a Edge 21B Lower end 21Ba Edge 21U Upper end 21Ua Edge 3 Filling machine 31 Bottom heat seal Device 32 Filling device 33 Top heat sealing device 4 Bottom seal pad 41 Pressing surface 42 Region where the thickness of the pressing surface is smallest 43 Region where the thickness of the pressing surface is middle 44 Region where the thickness of the pressing surface is the thickest 5 Pressing protrusion 6 Top seal jaw 61 Pressing surface 62, 63 Pressing projection 7 Tom seal pad 71 Pressing surface 72 The region where the thickness of the pressing surface is the thinnest or the lowest region 73 The region where the thickness of the pressing surface is the middle or slightly higher 74 The region where the thickness of the pressing surface is the thickest or the highest 82 Small Width projection 9 Top seal jaw 91 Pressing surface 101 Wide projection 102 Narrow projection

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Seiki Shimada 1-12-1 Yurakucho, Chiyoda-ku, Tokyo Nippon Paper Co., Ltd. (72) Inventor Tetsuo Oba 1-12-1 Yurakucho, Chiyoda-ku, Tokyo Japan Inside Paper Corporation (72) Inventor Yoshinori Suzuki Inside 1-12-1 Yurakucho, Chiyoda-ku, Tokyo

Claims (2)

[Claims] 1. A pressurizing component provided in a bottom heat sealing device and a top heat sealing device of a filling machine for a paper container having a gable top formed of a container material having thermoplastic resin coated on the entire front and back surfaces. A wide-width projection and a narrow-width projection corresponding to a wide end portion and a narrow end portion of the side seal flap of the paper container, respectively. Pressure parts. 2. The pressurizing part of the heat seal device for a paper container according to claim 1, wherein the height of the narrow width projection is set lower than the width of the wide width projection.