JP2003154584A - Filling machine for paper container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the sealbility of the bottom surface of a packaging material to be conveyed on a production line. SOLUTION: In a filling machine for a paper container, a molding station, a packing station, and a sealing station for conveying the packaging material for the paper container, molding the bottom part of the container, packing a content liquid, and sealing the top part of the container are provided in turn. Since a corona treatment part 21 for improving the sealbility of the bottom part T22 of the paper container 10 before the bottom part T22 is molded is formed in the molding station, the reliability of the sealing is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper container filling machine characterized in that molding, filling, and sealing stations are sequentially provided, and when the bottom of the paper container is molded at the molding station. This belongs to the technical field of a paper container filling machine provided with a corona treatment unit for improving the reliability of the sealing property of the bottom portion.

[0002]

2. Description of the Related Art Conventionally, in a composite type packaging container made of processed paper and resin, which is filled with liquid food such as milk and soft drink, sampling is performed manually after filling the content liquid. Then, the package was visually inspected for liquid leakage from the bottom of the packaging container.

However, even if there is no problem in the visual inspection immediately after the filling, liquid leakage may be found during the transportation until the market. That is, liquid leakage may occur due to poor sealing at the bottom of the container due to vibration during transportation. In this way, when there is a sealing failure at the bottom of the container, it can be said that it is impossible to completely catch it by only visual inspection immediately after filling. Therefore, a predetermined number of packaging containers are regularly pulled out from the production line, and a visual inspection or an ink penetration test is performed to inspect the bottom of the packaging container for a seal defect or damage. Cut the container, immerse water in the container, immerse the container in a water tank filled with another water, and conduct a continuity test to inspect whether there is a seal defect and judge whether it is a good product or a defective product I am trying.

[0004]

However, in the above-mentioned conventional quality inspection, the quality inspection is performed by periodically extracting a predetermined number of packaging containers from the production line. Since the quality inspection cannot be performed on all the packaging containers conveyed, the quality inspection is performed only on a predetermined number of the extracted packaging containers, so that the reliability of the quality inspection decreases. Further, the manual destructive test wastes labor costs, product costs, etc., leading to cost increase. Incidentally, since there are many sensory judgment factors in the inspection of the seal failure, there is a side that cannot be surely caught by visual inspection, an ink penetration test or a continuity test. Therefore, it is necessary to install an auxiliary device for improving the sealing property itself.

According to the present invention, in order to improve the sealing property of the bottom of the container, corona treatment is applied to the container bottom immediately before the container bottom is sealed for all the paper containers to be transported, so that the reliability of the bottom seal is improved. It is possible to improve the quality and reduce the work of the conventional quality inspection. The purpose of this is to reduce the cost increase by human and the cost increase by the destructive test.

[0006]

Therefore, in the filling machine of the present invention, the packaging material for a paper container is conveyed by a mandrel to form the bottom of the paper container, the content liquid is filled, and then the paper container is filled. Each of the molding, filling, and sealing stations for sealing the top portion is sequentially provided, and the corona for improving the sealing property of the bottom portion of the paper container before the bottom portion of the paper container is molded at the molding station. A processing unit is provided. In another filling machine of the present invention, the corona treatment section further includes: (a) a conveying unit that conveys the paper container to the corona treatment section by rotation of the mandrel; and (b) the corona treatment section. An electrode arranged to face the bottom of the container and spaced apart from the bottom by a predetermined distance to apply a voltage to the bottom; and (c) a control unit for controlling the voltage. A characteristic corona treatment section is provided. In still another filling machine of the present invention, the electrodes are arranged so that at least one surface of the bottom portion of the paper container can be subjected to corona treatment. In still another filling machine of the present invention, the electrode is arranged so as to retract to a position separated from the mandrel so as not to contact the bottom of the paper container when the mandrel rotates. [Detailed Description of the Invention]

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, FIG. 5 is a schematic explanatory view of each station for molding, filling and sealing in the embodiment of the present invention.
The outline of the paper container filling machine of the present invention will be described based on FIG. As shown in the figure, at the molding station, a cylindrical paper wrapping material is placed in a plane that intersects the conveyor line at 90 degrees, and a die for molding the bottom of the paper container called a mandrel is used to heat seal the bottom. After being formed, it is supplied as a paper container with a bottom on a conveyor line. Therefore, in this state, the paper container becomes a container that can be filled as a container without a lid. Next, after the paper container sent to the filling station of the next process on the conveyor line is filled with the content liquid, it is further moved on the conveyor to heat the upper part of the paper container, and then at the sealing station of the paper container. The upper part is compressed into a desired shape with a sealing machine and sealed, and a paper container having a final shape (see FIG.
The perspective view of the paper container after filling in the embodiment of the invention. ) Is formed.

By the time the filling of the inner solution into the paper container is started at the filling station, the paper container is lifted up until the tip of the filling nozzle comes close to the bottom of the empty container. At the same time when the filling of the solution is started, the paper container is lowered while being filled.This is to always keep the drop head when the inner solution is filled to be a minimum constant, and to prevent the inner solution from jumping. This is a device that prevents the bubbles from occurring as much as possible.

Next, the molding station will be described in more detail. FIG. 1 is a schematic system diagram of a corona processing unit according to an embodiment of the present invention. FIG. 2 is a diagram showing an electrode portion of the corona treatment portion in the embodiment of the present invention. Figure 3
FIG. 6 is a diagram showing a state of corona discharge of an electrode part of a corona treatment part in the embodiment of the present invention. FIG. 4 is an explanatory view of forming the bottom portion of the packaging container according to the embodiment of the present invention.

As shown in the figure, the mandrel is a rotary type consisting of a total of 6 sets arranged at equal intervals, and performs intermittent rotary motion in which rotation and stop are repeated up to respective predetermined stop positions. Therefore, the tubular packaging material 9 is sequentially conveyed by the conveyor 8 in the packaging material mounting portion 20, is inserted into the mandrel 11, and moves to the next corona processing portion 21. In the corona processing unit 21, the bottom T22 is attached to the mandrel in the state of FIG. 4 (1). Then, the electrode holder 47 holding the electrode 41 is inserted into the four sides of the bottom portion T22 to a predetermined depth so that the electrodes do not contact the bottom portion, and the rear corona discharge is applied by the control power supply 31. Then, after undergoing corona treatment for a predetermined time, the packaging material 9 is sent to the heating unit 22 in the next step. Of course, at that time, since the electrode holder 47 is retracted to a position apart from the packaging material 9 by a method not shown, the electrode holder and the packaging material do not interfere with each other when the mandrel rotates. In the heating unit 22, the resin surface on the surface of the packaging material is melted by a hot air or other heat source at a predetermined place in the region forming the bottom of the packaging material.

Further, in the sealing portion 23 in the next step, the packaging material is bent and pressure-bonded by a sealing device (details are not shown). That is, since the resin surface on the surface of the packaging material is melted by hot air or other heat source in the region forming the bottom portion of the packaging material, the bottom portion is pressure-bonded when the packaging material is bent and pressed at the same time.

The process of forming the bottom of the paper container will be described with reference to FIG. (1) shows the state before the bottom of the tubular packaging material is formed, and as shown in this figure, the four-sided wall of the packaging material is a parallel cylinder at first. Then (2),
As shown in (3), the bottom part is gradually folded along the crease line formed in advance in the packaging material. And (4) shows the bottom of the final state. Note that FIG. 6 shows a plan view in which a fold line (crease) is formed in advance on the packaging material. Further, as shown in FIG. 7, the packaging material is composed of an inner layer 66 and an outer layer 61 as resin layers on both sides of the paper base material 62.

Further, the mandrel is rotated as a transporting means for the paper container, and the paper container is moved to the filling station in the next step.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified within the scope of the present invention, and they are not excluded from the scope of the present invention. For example, the corona treatment is applied to the inner and outer surfaces of the bottom surface in the detailed view, but depending on the case, it may be sufficient that only the inner surface or only the outer surface is sufficient.

[0016]

As described above, in the filling machine of the present invention, the packaging material for a paper container is conveyed by the mandrel to form the bottom of the paper container, the content liquid is filled, and then the top of the paper container is filled. In a paper container filling machine characterized in that molding, filling, and sealing stations for sealing parts are sequentially provided, in the molding station, the sealing property of the bottom of the paper container before the bottom of the paper container is molded. A corona treatment unit for improving the above is provided. In this case, since the packaging material is surface-treated by corona treatment before the bottom portion is sealed, a more stable and reliable seal can be achieved when thermocompression bonding is performed, so that a bottom surface without liquid leakage can be formed.

Further, in another filling machine of the present invention,
The corona processing unit includes: (a) a conveying unit that conveys the paper container to the corona processing unit by rotation of the mandrel; and (b) a corona processing unit that faces the bottom of the paper container, and A corona treatment unit is provided which is provided with a predetermined distance from the bottom and applies a voltage to the bottom, and (c) a control unit for controlling the voltage. . In this case, since there is a distance between the bottom and the electrode, the packaging material is not damaged by the electrode and is not grounded, so that a desired corona discharge effect can be obtained.

Further, in another filling machine of the present invention, since at least one surface of the bottom of the paper container can be subjected to corona treatment, depending on the situation, the inside or outside of the bottom surface or the inside or outside surface of the bottom surface of the container can be treated. Both can be corona treated. Incidentally, the corona treatment may be performed on any of the four side surfaces of the container.

Further, in another filling machine of the present invention, the electrode is arranged so as to retract to a position apart from the mandrel so as not to contact the bottom of the paper container when the mandrel rotates. Therefore, the packaging material is not damaged during rotation.

Therefore, the conventional quality problem is solved, and the surface treatment is applied to the bottom seal area of all the paper containers conveyed on the production line, so that the bottom bottom sealability is improved. Since it is possible to improve the reliability of the quality, it is possible to provide a paper container filling machine that can reduce the required quality inspection, and reduce the manual cost increase and the cost increase due to the destructive test.

[Brief description of drawings]

FIG. 1 is a schematic system diagram of a corona processing unit according to an embodiment of the present invention.

FIG. 2 is a first diagram showing an electrode section of a corona treatment section in the embodiment of the present invention.

FIG. 3 is a second diagram showing a state of corona discharge of an electrode part of a corona treatment part in the embodiment of the present invention.

FIG. 4 is an explanatory view of forming a bottom portion of the packaging container according to the embodiment of the present invention.

FIG. 5 is a schematic explanatory view of each station for molding, filling, and sealing in the embodiment of the present invention.

FIG. 6 is a plan view of the packaging material in which creases are formed according to the embodiment of the present invention.

FIG. 7 is a cross-sectional view of a packaging material according to the embodiment of the present invention.

FIG. 8 is a perspective view of the paper container after filling according to the embodiment of the present invention.

[Explanation of symbols]

8 conveyor 9 packaging materials 10 paper containers 11 Mandrel 20 Packaging material mounting part 23 Seal part 22 Heating part 21 Corona processing unit 31 Control unit 41 Electrode part 47 electrode holder L1 to L4 vertical fold lines T1, T2 horizontal fold line 42 Paper-based packaging materials 61 outer layer 62 Paper base material 66 Inner layer T22 bottom

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3E049 AA04 AB06 BA01 DA02 DB01                       FA10                 3E075 AA07 BA03 BB22 CA01 DA04                       DA05 DA17 DA18 DA23 DA32                       DD11 DD42 GA04                 3E094 AA03 BA02 CA01 CA19 DA03                       DA08 EA02 FA03 FA25 HA08

Claims (4)

[Claims] 1. A filling machine for a paper container, wherein a paper container packaging material is conveyed by a mandrel to form the bottom of the paper container, the content liquid is filled, and then the top part of the paper container is sealed. Molding,
In a paper container filling machine, which is sequentially provided with filling and sealing stations, a corona treatment for improving the sealing property of the bottom of the paper container before the bottom of the paper container is molded in the molding station. Filler for paper containers in which parts are arranged. 2. The corona processing unit comprises: (a) a conveying unit that conveys the paper container to the corona processing unit by the rotation of the mandrel; and (b) a corona processing unit that faces the bottom of the paper container. And an electrode that is disposed at a predetermined distance from the bottom and applies a voltage to the bottom,
The paper container filling machine according to claim 1, further comprising (c) a control unit for controlling the voltage. 3. The paper container filling machine according to claim 1, wherein the electrode is arranged so that at least one surface of the bottom of the paper container can be subjected to corona treatment. 4. The electrode is arranged so as to be retracted to a position apart from the mandrel so as not to contact the bottom of the paper container when the mandrel rotates.
The filling machine for paper containers according to.