JP2002002624A - Impulse sealing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an impulse sealing machine capable of easily forming air vent holes formed in sealing a packaging bag. SOLUTION: The air vent holes are formed while preventing the heat generation from heat generating bodies 15a and 15b by providing conductors 18a and 18b at the positions where the air vent holes 5a and 6a are formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impulse sealing machine for sealing a packaging bag, and more particularly to a method for forming an air vent hole (unsealed portion).

[0002]

2. Description of the Related Art There are two types of packaging bags, which are hermetically sealed with stored items, and those which may have air vent holes. For example, a rice bag for distribution belongs to the latter, and air remaining in the packaging bag may cause damage to the packaging bag or slippage of the packaging bag when the packaging bags are not stacked properly. Therefore, as shown in FIG. 1, small air vent holes 5a and 6a disclosed in Japanese Patent Application No. 9-200973 of the applicant himself are formed in the packaging bag of rice to solve such troubles. Is being planned. And the sealing machine which forms these air vent holes 5a and 6a is performed through a heating element which forms a gap at a position corresponding to the air vent holes.

[0003]

As described above, since the air vent hole is formed through a heating element capable of forming a gap at a position corresponding to the air vent hole, it is necessary to form the air vent hole in a different shape or the like. FIG. 4 shows a sealing machine capable of forming the air vent hole. When this sealing machine is briefly described, reference numeral 11 denotes an elevator on which a silicone rubber 11a is attached.
On the mountain-shaped base 20, there are protruding portions 21a protruding corresponding to the portions to be sealed.
A portion 21b corresponding to a and 6a is formed flat.

A heating element is built in the base 20, and is connected to a control device via a lead wire 22.
Further, the base 20 has a built-in thermocouple, which is connected to a control device via a lead wire 23. Part 21
a) is heated. Therefore, when the packaging bag is placed on the base 20 and sandwiched between the elevating platform 11, the protrusion 21a is sealed, and other flat portions are not sealed to form air vent holes.

[0005] As another sealing machine, there is an impulse sealing machine, but it is impossible to create an air vent hole (a place where no sealing is performed) with this sealing machine. Therefore,
The present invention provides an impulse sealing machine capable of easily changing the shape and position of an air hole.

[0006]

According to the first aspect of the present invention, there is provided an impulse sealing machine in which a conductor is provided at a position where an air vent hole is formed, and the conductor does not generate heat. Holes) are formed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. FIG. 1A is a plan view of a packaging bag (for example, a packaging bag for rice) 1, and FIG. 1B is a partially enlarged view of a heat seal portion. The packaging bag 1 is formed in a bag shape by bonding the thermoplastic films on the front and back sides and heat-sealing the side edges 2a and 2b and the bottom edge 3. Then, after storing items (rice, etc.) in the packaging bag 1, the inner seal 5 is opened at the opening 4 by an impulse sealing machine described later.
The outer seal 6 and the outer seal 6 are double-sealed, and the air vent inner hole 5a and the air vent outer hole 6a are formed to prevent leakage of stored items and smooth air vent.

The inner seal 5 has an inner seal portion 5A.
Air release inner hole 5a (length L1) between the inner seal portion 5A
And this pattern is repeated. In addition, the air vent inner hole 5a is selected to have a size that allows sufficient air vent and prevents leakage of stored items.

On the other hand, the outer seal 6 is
In order to smoothly ventilate the air, the communication space 8 is formed and the air vent outer hole 6a (length L2) and the outer seal portion 6A are repeated in a repeated pattern. The center of the air release outer hole 6a and the center of the inner seal portion 5A coincide with each other, and the center of the air release inner hole 5a and the center of the outer seal portion 6A coincide with each other. The air release outer hole 6a faces the seal portion 6A, and the air release outer hole 6a faces the inner seal portion 5A, and the air release outer hole 6a and the air release inner hole 5a do not face each other.

Accordingly, the air in the packaging bag 1 hits the outer seal portion 6A from the inner hole 5a, passes through the communication space 8, and passes through the outer hole 6a.
For example, even if the stored material (rice grains) reaches the communication space 8 from the inner hole 5a, it does not directly reach the outer hole 6a and substantially accumulates in the communication space 8, but the volume of the communication space 8 is reached. This allows the air to be evacuated smoothly without blocking the ventilation.

FIG. 2 is a perspective view of the impulse sealing machine 10. Reference numeral 11 denotes a lifting table to which a silicone rubber 11a is attached. The lifting table 11 includes a heating element (such as a nichrome wire) 15 or the like.
It is possible to move up and down corresponding to the electrode 13 to which a and 15b are attached. Also, a U-shaped electrode 13 that can bend slightly
Two heating elements (such as nichrome wires) 15a and 15b corresponding to the inner seal 5 and the outer seal 6
A small gap is formed with the base 12 so as to be laterally provided with screws 14 and both ends of the electrode 13 are connected to a low-voltage power supply (10 to 30 V AC) (not shown) via lead wires 13 a.

On the surface of the base 12 made of epoxy resin or the like, a conductor (such as a copper plate) is provided at a position corresponding to the heating elements 15a and 15b and at a position where the air vent inner hole 5a and the outer hole 6a are formed. ) 18a and 18b are buried. still,
The length of the conductor 18a is the length L1 of the inner hole 5a,
The length of the conductor 18b is the length L2 of the outer hole 6a. or,
As described above, the conductors (such as copper plates) 18a and 18b may be buried in the base 12 as well as the heating element 15a.
The conductor 18a may be formed by welding on the a and 15b.

FIG. 3 is a circuit diagram of the impulse sealing machine 10, which comprises heating elements (such as nichrome wires) 15a and 15b and conductors (such as copper) 18a and 18b when sealing the opening 4 of the packaging bag. is there. That is, this circuit diagram shows the lifting table 1
1 descends and presses the heating elements 15a and 15b, and the packaging bag 1
Is a circuit when the heating element 15 is sandwiched between the
Since the conductors 18a and 18b are in close contact with the conductors 18a and 18b via the packaging bag 1, a bypass circuit is formed by the conductors 18a and 18b. As a result, the heating elements 15a 'and 15b' where the conductors 18a and 18b are located have a low resistance value and do not generate heat, so that they become unsealed areas, and the air vent inner hole 5a and the air vent outer hole 6a can be formed.

As described above, by providing the conductor at the position where the air vent hole is formed, since the temperature of the heating element does not rise, the air vent hole can be easily formed, and the position and shape of the conductor are changed. Thereby, the position and shape of the air vent hole can be easily changed.

[0015]

According to the first aspect of the present invention, the conductor is provided at the position where the air vent hole is formed.
Since the heating element is not heated, an air vent hole can be easily formed.

[Brief description of the drawings]

FIG. 1A is a plan view of a packaging bag, and FIG. 1B is a partially enlarged view of a heat sealing portion.

FIG. 2 is a perspective view of an impulse sealing machine.

FIG. 3 is a circuit diagram including a heating element and a conductor.

FIG. 4 is a configuration diagram of a conventional heat sealing machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Packaging bag 4 Opening part 5 Inner seal 5A Inner seal part 6 Outer seal 6A Outer seal part 5a Air release inner hole 6a Air release outer hole 11 Elevating stand 12 Base 15a, 15b Heating element 18a, 18b Conductor

Claims (1)

[Claims] 1. An impulse sealing machine for sandwiching and sealing a packaging bag between a base and a heating element, wherein a conductor is provided at a position where an air vent hole is formed.