JP2673399B2 - Packaging film sealing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a method for accommodating a drug solution container or the like in a packaging film.

[0002]

2. Description of the Related Art A chemical solution which is easily deteriorated by oxygen, when filled in an ordinary gas permeable plastic container, must be further stored in a gas barrier outer bag. The method includes the following steps as shown in FIG. The packaging film 1 is formed into a cylindrical shape. As for the tubular packaging film 1, as shown in FIG. 2, a sheet-shaped plastic film is folded back to weld both side edges. The tip of the tubular packaging film 1 is welded. As shown in FIGS. 3 and 4, the packaging film 1 is transported forward, and the stored items are placed in the packaging film 1 with the tips welded. An inert gas such as nitrogen gas is filled into the inside of the packaging film 1 from a gas pipe 2 inserted through the packaging film 1 to discharge air. Gas pipe 2 is packaging film 1
It is located behind the welded part of. This is because it does not interfere with the welding of the packaging film 1. The packaging film 1 is hermetically sealed by heat sealing the rear of the container. In this state, the container containing the liquid medicine is airtightly stored in the packaging film 1.

[0003]

In this method of airtightly packing the contents, air leakage may occur from the heat-sealed portion. When there is an air leak, inert gas is exhausted and the air enters and harms the contents. For example, oxygen contained in the invaded air has a harmful effect of permeating the storage container and oxidizing the contents. Air leakage occurs at the heat-sealed portion because a part of the packaging film 1 is bent and sealed as shown in FIG. When heat-sealed in this state, the seal bar for sandwiching and heating the packaging film 1 will weld a plastic film of four layers partially and two layers at the other part. 4
Since the thickness of the layer portion and the thickness of the two-layer portion are halved, fine voids are formed in this portion, which causes air leakage.

If the packaging film is heat-sealed in a state where a part of the packaging film is bent, the external appearance is also deteriorated. Furthermore, it may cause pinholes later.

The present invention was developed for the purpose of solving this drawback, and an important object of the present invention is to provide a packaging film 1 capable of neatly heat-sealing a tubular packaging film without air leakage. To provide a sealing method.

[0006]

According to the method for sealing a packaging film of the present invention, the packaging film is heat-sealed as described below to achieve the above-mentioned object. That is,
According to the method of the present invention, a plastic film is molded into a tubular shape, the packaging film 1 molded into a tubular shape is filled with a storage item 3, and a gas pipe 2 is inserted into the inside to fill an inert gas and heat seal. It is an improved method.

According to the method of the present invention, the tip of the gas pipe 2 for filling the inside of the packaging film 1 with an inert gas such as nitrogen is sucked to the outside of the packaging film 1 by magnetic attraction.
The packaging film 1 is heat-sealed in a state where the packaging film 1 is expanded by the gas pipe 2.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. However, the embodiments described below illustrate a method for embodying the technical idea of the present invention, and the method of the present invention is based on the structure, arrangement, used materials, shape of gas pipe, The type of the active gas is not specified as follows. The method of the present invention can be variously modified within the scope of the claims.

Further, in this specification, for easier understanding of the claims, the numbers corresponding to the members shown in the embodiments are added to the members shown in the "means for solving the problem". ing. However, the members shown in the claims are
It is by no means specific to the members of the embodiment.

The packaging film 1 is heat-sealed in the following steps to hermetically seal the contents 3. As shown in FIG. 1, a sheet-like packaging film 1 wound in a roll is pulled out, both sides thereof are folded down, and both edges are heat-sealed. In this state, the sheet-like packaging film 1 is formed into a tubular shape. The front end of the packaging film 1 formed in a tubular shape is transferred to a heat-sealing portion that is thermocompression bonded. The heat seal part sandwiches the upper and lower sides of the packaging film 1 with seal bars 4 and heat seals them. The seal bar 4 is an elongated bar extending in a direction intersecting with the packaging film 1, and is heated to a temperature at which the packaging film 1 which is a thermoplastic synthetic resin can be pressurized and welded. Further, as shown in FIGS. 6 to 7, the packaging film 1 is transported forward. The distance by which the packaging film 1 is advanced in this state is adjusted so that the stored items 3 can be inserted before the heat sealing portion. In other words, the intervals are adjusted to the intervals at which the stored items 3 are heat-sealed. The container 3 such as a medicine is inserted in front of the portion to be heat-sealed. The storage item 3 is inserted from the opened rear end. An inert gas such as nitrogen gas is jetted from the gas pipe 2 to exhaust the air in the packaging film 1 to fill the inert gas. The gas pipe 2 is located to the right of the heat seal portion as shown in FIGS. 6 and 7 so as not to be sandwiched by the seal bar 4. As shown in FIG. 8, the tip of the gas pipe 2 is sucked to the outside of the packaging film 1 by a magnetic suction force. The gas pipe 2 whose tip is sucked outward expands the packaging film 1. The expanded and expanded packaging film 1 has a flat surface without wrinkles by pulling the upper and lower surfaces with a constant tension. In a state where both sides of the packaging film 1 are expanded and pulled with a peen, the seal bar 4 thermocompresses and heat seals the packaging film 1.

In this way, the packaging film 1 hermetically seals the storage item 3. The packaging film sealing method of the present invention is characterized in that the packaging film 1 is expanded with a gas pipe 2 and heat-sealed. In order to realize this, that is, in order to suck the gas pipe 2 to the outside, the magnetic metal 5 is fixed to the tip of the gas pipe 2. Further, an electromagnet 6 for adsorbing the magnetic metal 5 of the gas pipe 2 is arranged near the tip of the gas pipe 2 and outside the packaging film 1. The electromagnet 6 attracts the magnetic metal 5 when energized, and does not attract the gas pipe 2 when not energized.

Further, the packaging film 1 is magnetically attracted.
As shown in FIG. 1, the gas pipe 2 extending horizontally extends horizontally toward the tip of the packaging film 1. As shown in FIG. 1, the gas pipe 2 extends from a sheet-shaped portion that is not formed into a cylindrical shape toward the tip of the cylindrical packaging film 1. The gas pipe 2 is an elongated pipe having a rear end connected to a gas cylinder 10. An on-off valve 9 is connected between the gas pipe 2 and the gas cylinder 10. When the on-off valve 9 is opened, gas is injected from the gas pipe 2 to the packaging film 1. When the on-off valve 9 is closed, the gas injection is stopped.

The total length of the gas pipe 2 is usually designed in the range of 50 cm to 2 m so that it can be extended from the sheet portion of the packaging film 1 to the vicinity of the tip. Long gas pipe 2
With the rear end fixed, the front end can be attracted by the electromagnet 6 and the packaging film 1 can be opened. This is because the gas pipe 2 is easily elastically deformed. Further, in the long gas pipe, as shown in FIG. 9, the magnetic metal 5 may be fixed at two positions on the tip end portion, and the electromagnet 6 may be arranged outside the magnetic metal 5. The short gas pipe 2 is not shown, but the gas pipe 2
The rear end is fixed to the base through an elastically deformable metal or a rubber-like elastic body so that the front end can be expanded without deforming.

As the magnetic metal 5 fixed to the gas pipe 2, any metal that is adsorbed by a magnet can be used. However,
As the magnetic metal 5, a permanent magnet can be used instead of the metal adsorbed on the magnet. When a permanent magnet is fixed to the gas pipe 2, the electromagnet 6 reverses the direction of the current and repels or attracts the permanent magnet. As shown in FIG. 10, when the outside of the permanent magnet fixed to the gas pipe 2 is the S pole, the opposite pole of the electromagnet 6 can be the S pole to repel the gas pipe 2 with a magnetic force. Further, by setting the opposite pole of the electromagnet 6 to the N pole, the gas pipe 2 can be sucked through the permanent magnet.

When a permanent magnet is fixed to the gas pipe 2 as the magnetic metal 5, the electromagnet 6 can be attracted without being energized. This is because the permanent magnet is attracted to the iron core of the electromagnet 6. Therefore, when the permanent magnet is fixed to the gas pipe 2, the energization of the electromagnet 6 is stopped when the gas pipe 2 is expanded, and when the gas pipe 2 is not expanded, the electromagnet 6 is energized so as to repel the permanent magnet. Is also possible.

Further, an air core coil without an iron core can be used as the electromagnet 6. The permanent magnet is not attracted to the electromagnet 6 of the air-core coil when no current is supplied. Therefore, the electromagnet 6 is energized when the permanent magnet is attracted. Electromagnet 6
Is set to the direction in which the electromagnet 6 attracts the permanent magnet. The electromagnet 6 can be energized in a direction to repel the permanent magnet without attracting the permanent magnet.

Further, a metal which is not attracted to the magnet, for example, a conductive metal 11 such as copper, aluminum or stainless can be fixed to the gas pipe 2 to generate a magnetic attraction force. In these conductive metals 11, an eddy current flows when there is a fluctuating magnetic field outside. When an eddy current flows, a magnetic field is generated, which is equivalent to a magnet formed in the gas pipe 2. FIG. 11 shows a principle diagram of expanding the gas pipe 2 by utilizing this phenomenon. As shown in FIG.
When the conductive metal 11 is fixed to the magnet pipe, magnets 7 are arranged above and below the conductive metal 11 and the magnet 7 is moved in the direction shown by the arrow A, the gas pipe 2
Receives a magnetic force in the direction indicated by arrow B. This is because the current flowing through the conductive metal 11 of the gas pipe 2 creates a magnetic field, and the magnetic field and the magnetic field of the magnet 7 act. in this way,
The method of moving the magnet 7 has a complicated structure for mechanically moving the magnet 7. When the magnet 7 is moving, a force indicated by an arrow B acts on the gas pipe 2.
Stops, the expanding force does not act on the gas pipe 2.

The method of electrically moving the magnetic field without moving the magnet can simplify the structure. FIG. 12 shows a device that realizes this. In the device shown in this figure, a plurality of AC magnets 8 are arranged above and below a gas pipe 2. By passing alternating currents having different phases through the plurality of AC magnets 8, a moving magnetic field can be obtained by the method indicated by the arrow A. When a moving magnetic field is generated by the AC magnet 8, an eddy current flows through the conductive metal 11 fixed to the gas pipe 2,
Due to the magnetic field caused by this, the gas pipe 2 receives the expanding force in the direction shown by the arrow B. This structure simplifies the mechanism because there is no need to move the magnet. Gas pipe 2
When it is necessary to expand the power supply, the AC magnet 8 is energized to generate a moving magnetic field in the direction of the arrow. When the gas pipe 2 is not expanded, the energization of the AC magnet 8 is stopped.

[0019]

The method for sealing a packaging film of the present invention is as follows.
The tip of a gas pipe that supplies gas to the inside is pulled outward by magnetic attraction, the tubular packaging film is expanded with the gas pipe, and heat sealing is performed in this state. The cylindrical plastic film expanded by the gas pipe is pulled with a predetermined tension on the upper surface and the lower surface to be in a wrinkle-free state. By heat-sealing the packaging film in this state, there is a feature that air leakage at the welded part is minimized and the upper and lower plastic films can be neatly adhered.

Further, in the method for sealing a packaging film according to the present invention, since the packaging film is expanded with a gas pipe filled with an inert gas, no special member is required to remove wrinkles in the packaging film. . Preferably,
Since the gas pipe is inserted from the sheet-shaped portion of the plastic film into the cylindrical portion, the total length is considerably long. With a long gas pipe, the tip of the long gas pipe can be pulled by a magnetic attraction force to expand the packaging film without difficulty. Therefore, the method for sealing a packaging film of the present invention has a feature that it can efficiently seal the packaging film in an ideal state with a simple structure.

[Brief description of the drawings]

FIG. 1 is a side view showing a state in which a sheet-like packaging film is formed into a tubular shape and a stored item is sealed.

FIG. 2 is a sectional view showing a state in which the packaging film is formed into a cylindrical shape.

FIG. 3 is a perspective view showing a portion for heat-sealing the packaging film.

FIG. 4 is a perspective view showing a part for heat-sealing the packaging film.

FIG. 5 is a cross-sectional view showing a portion to be heat-sealed when the packaging film is wrinkled

FIG. 6 is a perspective view of a part for heat-sealing a packaging film according to an embodiment of the present invention.

FIG. 7 is a perspective view of a portion for heat-sealing a packaging film showing an embodiment of the present invention.

FIG. 8 is a cross-sectional view showing a state in which the packaging film is expanded with a gas pipe.

FIG. 9 is a cross-sectional view showing a state in which the packaging film is expanded with a gas pipe.

FIG. 10 is a cross-sectional view showing a state in which a packaging film is expanded with a permanent magnet fixed to a gas pipe.

FIG. 11 is a cross-sectional view showing a state in which a packaging film is expanded with a conductive metal fixed to a gas pipe.

FIG. 12 is a cross-sectional view showing a state in which a packaging film is expanded with a conductive metal fixed to a gas pipe.

[Explanation of symbols]

 1 ... Packaging film 2 ... Gas pipe 3 ... Storage item 4 ... Seal bar 5 ... Magnetic metal 6 ... Electromagnet 7 ... Magnet 8 ... AC magnet 9 ... Open / close valve 10 ... Gas cylinder 11 ... Conductive metal

Claims (1)

(57) [Claims] 1. A sheet-shaped plastic film is formed into a tubular shape, the packaging film formed into a tubular shape is filled with an item to be stored, and a gas pipe is inserted from the sheet-shaped portion into the tubular portion to form an inert gas. In the method of filling and heat sealing, the tip of the gas pipe is sucked to the outside of the packaging film by a magnetic suction force, and the packaging film is heat-sealed in a state of expanding the packaging film with the gas pipe. Packaging film sealing method.