JP2002308234A - Filling machine for paper container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform quality inspection on all subjects carried on a production line. SOLUTION: The filling machine for a paper container has a carry means for carrying a subject, and an analysis processing means comprising a first electrode placed oppositely to a predetermined region of the subject at a predetermined distance from the subject for applying an inspection voltage to the subject, and a second electrode placed in contact with the subject for inspecting whether the subject is damaged based on a feedback current flowing in the second electrode. In this case, since whether the subject is damaged is inspected based on the feedback current flowing in the second electrode while the subject is being carried, all subjects carried on the production line can be determined as to whether it is good or defective.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a paper container filling machine, characterized in that molding, filling and sealing stations are sequentially provided. It belongs to the technical field related to a paper container filling machine in which a quality inspection device for automatically inspecting the sealing property of a bottom portion is provided.

[0002]

2. Description of the Related Art Conventionally, in the case of a composite packaging container made of processed paper and resin for filling liquid foods such as milk and soft drinks, for example, the packaging container is manually sampled after filling the content liquid. Then, it was visually inspected for liquid leakage from the bottom of the packaging container.

[0003] However, even if there is no problem in visual inspection immediately after filling, liquid leakage may be found at the time of transport until the product enters the market. That is, liquid leakage may occur from a small pinhole at the bottom of the container due to vibration during transport. It can be said that it is possible. Therefore, a predetermined number of packaging containers are periodically removed from the production line, and a quality inspection is performed to check whether the bottom of the packaging container has been damaged by visual inspection or an ink penetration test. Cut and immerse the water in the container, immerse the container in another water tank filled with water, and conduct a continuity test to check for the presence of pinholes and determine whether the product is good or defective. ing.

[0004]

However, in the 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 for all the packaging containers transported and the quality inspection is performed only for a predetermined number of extracted packaging containers, the reliability of the quality inspection decreases. In addition, manual destructive testing wastes labor costs, product costs, and the like, leading to an increase in cost.

The present invention solves the problem of the conventional quality inspection and can perform the quality inspection of the bottom of all the paper containers conveyed on the production line, thereby improving the reliability of the quality inspection. In addition, it is an object of the present invention to provide a quality inspection apparatus capable of increasing the accuracy of determining whether a product is good or defective, and to reduce cost increase due to manual labor and destructive test.

[0006]

[Detailed description of the invention]

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings.

First, FIG. 5 is a schematic explanatory view of each station of 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 forming station, the bottom of the paper container is heat-sealed by a mold for forming the bottom of the paper container called a mandrel disposed in a plane where the cylindrical paper packaging material intersects the conveyor line at 90 degrees. After being formed, it is supplied as a paper container with a bottom on the conveyor line. Therefore, in this state, the paper container is a container that can be filled as an uncovered container. Next, after the content liquid is filled into the paper container sent to the filling station of the next process on the conveyor line, the paper container is further moved on the conveyor to heat the upper part of the paper container, and then the paper container is sealed at the sealing station. The upper part is compressed into a desired shape with a sealing machine and sealed, and a paper container having a final shape (FIG.
The perspective view of the paper container after filling in an embodiment of the invention. ).

[0009] By the time the filling solution is started to be filled into the paper container at the filling station, the paper container is lifted up until the tip of the filling nozzle comes to a position close to the bottom of the empty container. At the same time as the filling of the solution is started, the paper container is filled and descends, and this is to always keep the falling head when filling the inside solution to a minimum constant, so that the inside solution jumps. It is a device that prevents as much as possible and generates no bubbles.

Next, the molding station will be described in more detail. FIG. 1 is a schematic system diagram of a quality inspection unit according to the embodiment of the present invention. FIG. 2 is a first diagram showing a state of the inspection by the detection unit according to the embodiment of the present invention. FIG. 3 is a second diagram illustrating a state of the inspection by the detection unit according to the embodiment of the present invention. FIG. 4 is a diagram illustrating the formation of the bottom of the packaging container according to the embodiment of the present invention.

As shown in the figure, the mandrel is of a rotary type composed of a total of six sets arranged at equal intervals, and performs an intermittent rotary motion in which rotation and stop are repeated to a predetermined stop position. Therefore, the cylindrical packaging material 9 is sequentially conveyed by the conveyor 8 in the packaging material mounting section 20 and inserted into the mandrel 11, and moves to the next bottom prefolding section 21. In the bottom prefolding 21, a portion to be the bottom of the cylindrical packaging material 9 is preliminarily bent by a method not shown by a method not shown, so that it can be easily bent at the time of forming the bottom in the next step. At the same time, the resin surface on the surface of the packaging material is melted by hot air or another heat source by a method (not shown) in a region that needs to be heat-fixed when forming the bottom portion after forming the bending habit while forming the bottom portion.

In the sealing section 22 in the next step, the packaging material is bent and pressed by a sealing device (not shown in detail).
In other words, since the resin surface of the surface of the packaging material is melted by hot air or another heat source in the region forming the bottom of the folded packaging material, the bottom portion is formed by pressing when the packaging material is bent and pressed simultaneously. It is.

Here, the process of forming the bottom of the paper container will be described with reference to FIG. (1) shows a state before the bottom of the cylindrical packaging material is formed. As shown in this figure, initially, the four walls of the packaging material are parallel cylinders. Next, (2),
As shown in (3), the bottom is gradually folded along the fold line formed in advance on the packaging material. And (4) shows the bottom in the final state. FIG. 6 is a plan view in which crease lines (creses) formed in advance on the packaging material are shown. Further, as shown in FIG. 7, the packaging material includes an inner layer 66 and an outer layer 61 as resin layers on both sides of a paper base 62.

Further, by rotating the mandrel as a means for transporting the paper container, the paper container is transported to the bottom quality inspection section 23 in the next step. The bottom quality inspection unit 23 is provided with a quality inspection device 50 for inspecting whether a weld such as a pinhole or a crack has occurred in the welded portion at the bottom of the container.
In the quality inspection device 50, the paper container is disposed so as to face the bottom of the paper container and at a predetermined distance from the bottom,
A second electrode disposed so as to be in contact with a test electrode (pin) 41 attached to a base 34 as a first electrode for applying a test voltage to the bottom via a mandrel for transporting the paper container. , A control unit 31 and a galvanometer 32.

The tip of the inspection electrode 41 is arranged at a distance of about 10 [mm] from the packaging container. Therefore, the inspection container 41 does not damage the packaging container during the inspection. In addition, the inspection electrode 41
Since the is opposed to the bottom below the packaging container, the distance in the height direction between the tip of the test electrode 41 and the packaging container is always constant after being set in the initial adjustment, and the dimensions of the packaging container change. Will not be changed.

The control unit 31 applies an inspection voltage of 8 to 12 kV at a frequency of, for example, 500 Hz to the inspection electrode 41, and further applies the inspection voltage to the packaging container. Also, the feedback current flows through the ground electrode 33 to an analysis circuit (not shown) of the control unit 31 as analysis processing means. Therefore, the analysis circuit detects whether the packaging container has been damaged based on the detected feedback current by detecting the feedback current, and determines whether the product is good or defective based on the inspection result. Can be determined.

In this case, since the ground electrode 33 extends near the center of the rotary via the mandrel, the feedback current flows smoothly through the analysis circuit. Therefore, it is possible to accurately inspect whether the packaging container is damaged. The setting of the inspection voltage is set in accordance with the specification of the packaging container, and is changed as needed when the specification is different.

The packaging container 1 in which no damage has occurred
When an inspection voltage is applied to the packaging container 10 by the inspection electrode 41 at 0, a uniform corona discharge as shown in FIG. Along with this,
Since a large part of the electrical energy of the inspection voltage is consumed, only a small amount of charge remains in the packaging container 10. Therefore, since only a small discharge current flows through the ground electrode 33, an analysis circuit (not shown) incorporated in the control unit 31 determines that the packaging container 10 has not been damaged.

On the other hand, when an inspection voltage is applied by the inspection electrode 41 to the damaged packaging container 10, the damaged portion of the container body 11 from the pin 41 is shown in FIG. Such intensive corona discharge is generated. Accordingly, the electric energy of the inspection voltage is easily transmitted to the mandrel, so that a large amount of electric charge remains in the packaging container 10. Therefore, a large amount of feedback current flows through the ground electrode 33, and a DC voltage is generated. The analysis circuit may determine if the generated DC voltage is higher than a threshold value.
Is determined to be damaged, and if the DC voltage is equal to or less than the threshold, it is determined that the packaging container 10 is not damaged. If the analysis circuit determines that the packaging container 10 has been damaged, the analysis circuit determines that the packaging container 10 is defective, and if it determines that the packaging container 10 has not been damaged, The container 10 is determined to be good.

In this case, the inspection voltage is applied to the inspection electrode 41 only while the packaging container 10 is passing in front of the inspection electrode 41. The application of the inspection voltage is turned on when the mandrel stops moving to the bottom quality inspection unit 23, and is turned off when the mandrel leaves the bottom quality inspection unit 23. During this time, the analysis circuit causes damage to the packaging container 10. Determine if you are.

When it is determined that the packaging container 10 is defective, the packaging container 10 is discharged to a defective product discharge section (not shown). It is possible to investigate the cause of the occurrence of damage to the device 10 and quickly take necessary measures.

As described above, while the packaging container 10 is being conveyed, the inspection electrode 41 applies an inspection voltage to the packaging container 10 to inspect whether the packaging container 10 has been damaged. Since it is possible to determine whether or not 10 is a non-defective product or a non-defective product, it is possible to determine a non-defective product and a non-defective product for all the packaging containers 10 conveyed on the production line.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified based on the gist of the present invention, and they are not excluded from the scope of the present invention.

[0024]

As described above, in the filling machine of the present invention, the packaging material for the paper container is conveyed to the mandrel to form the bottom of the paper container, and the inner solution is filled. Each of the molding, filling, and sealing stations for sealing the top portion is sequentially provided, and quality inspection for inspecting the sealing property of the bottom portion immediately after the bottom portion of the paper container is formed at the molding station. This is a paper container filling machine in which the section is disposed. The quality inspection unit includes: (a) conveying means for conveying the paper container to the quality inspection unit by rotation of the mandrel; and (b) the quality inspection unit facing the bottom of the paper container. A first electrode that is disposed at a predetermined distance from the bottom and that applies an inspection voltage to the bottom; and (c) is disposed so as to contact the paper container along a mandrel that conveys the paper container. A second electrode provided;
(D) the quality inspection unit includes a control unit for inspecting whether or not the bottom of the paper container is damaged based on a feedback current flowing through a second electrode. Provided is a paper container filling machine having an inspection device.

Therefore, the problem of the conventional quality inspection can be solved, and the quality inspection of the bottom portion can be performed for all the paper containers conveyed on the production line, so that the reliability of the quality inspection can be improved. Therefore, it is an object of the present invention to provide a filling machine for a paper container in which a quality inspection device capable of promptly taking necessary measures is provided, and to reduce cost increase due to manual and destructive tests.

[Brief description of the drawings]

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

FIG. 2 is a first diagram illustrating a state of an inspection performed by a detection unit according to the embodiment of the present invention.

FIG. 3 is a second diagram illustrating a state of the inspection performed by the detection unit according to the embodiment of the present invention.

FIG. 4 is an explanatory diagram illustrating formation of a bottom portion of the packaging container according to the embodiment of the present invention.

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

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

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

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

[Explanation of symbols]

 8 Conveyor 9 Packaging material 10 Paper container 11 Mandrel 20 Packaging material mounting part 21 Bottom prefolding part 22 Seal part 23 Bottom quality inspection part 31 Control part 32 Current detector 33 Earth electrode 50 Quality inspection device 34 Base 41 Inspection electrode (pin L1 to L4 Vertical fold line T1, T2 Horizontal fold line 42 Paper-based packaging material 61 Outer layer 62 Paper base material 66 Inner layer T22 Bottom part

Claims (2)

[Claims] 1. A filling machine for a paper container, wherein a packaging material for a paper container is conveyed by a mandrel to form a bottom portion of the paper container, a content liquid is filled, and then a top portion of the paper container is sealed. Molding
In the filling machine for paper containers, each of filling and sealing stations is sequentially provided, wherein the molding station includes a quality inspection unit for inspecting the sealing property of the bottom after the bottom of the paper container is molded. Is a filling machine for paper containers. 2. The quality inspection unit comprises: (a) transport means for transporting the paper container to the quality inspection unit by rotation of the mandrel; and (b) the quality inspection unit facing the bottom of the paper container. And a first electrode for applying an inspection voltage to the bottom disposed at a predetermined distance from the bottom, and (c) disposed in contact with the paper container via the mandrel. And a control unit for determining whether or not the bottom of the paper container is damaged based on a feedback current flowing through the second electrode in the quality inspection unit. The filling machine for paper containers according to claim 1, further comprising a quality inspection device.