JPH0321411B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that automatically thermally seals the powder inlet of an inner-valve type double-bottom double-sided packaging bag filled with powder such as wheat flour. . In the present invention, heavy packaging bags include not only paper bags but also laminated bags,
Although the term refers to a wide range of bags such as plastic molded bags, the following explanation will take a paper bag as a representative example.

Conventionally, internal valve type paper bags have been widely used, in which powder or granular material is injected through an internal valve opening and the valve opening is closed by the pressure of the contents filled inside the bag. However, there are problems such as the powder inside the bag leaking out of the bag through the injection port when the bag is transported or stored. Therefore, the injection port needs to be tightly sealed. Conventionally, this injection port sealing work has been performed by complicated manual work. However, since it is necessary to perform very complicated work in large quantities, an automatic sealing machine as disclosed in Japanese Patent Publication No. 48-21149, for example, has been developed. This type of automatic machine is applied to square-bottomed bags, and requires a tedious process in which the protruding outer valve opening is bent along the bottom of the bag, pressed with a spring, and then heat-sealed. figure,
Not only is this extremely inconvenient, but the structure of the device itself is complicated. Further, when a paper bag filled with powder or granules is pressed, the contents may be ejected from the valve opening due to uneven distribution of the contents.

The inventors of the present application have already proposed Japanese Patent Application Laid-open No. 82829/1982 as a technique for solving such problems. Although it is possible to satisfactorily heat seal the powder injection opening of a heavy packaging bag with this device, it is necessary to develop a device with a simpler structure and equivalent heat sealing function. It was wanted.

Therefore, the present invention is applied to an inner-valve type, double-bottomed, heavy-duty wrapping paper bag that seals the filler port to eliminate the defects of the conventional inner-valve type, bottom-stick bags, and prevents the contents from entering when the filler port is sealed. An object of the present invention is to provide an automatic sealing device for an injection port of a heavy-duty paper bag, which can reliably, strictly, and automatically seal a powder injection port without causing problems such as ejection.

According to a first aspect of the present invention, there is provided an automatic sealing device for a filling port of a heavy packaging bag, which is attached to a conveying means for a heavy packaging bag, and the initial stage is generally perpendicular to the transport direction of the heavy packaging bag. A heat sealing means having a heater that remains in position and rotates when engaged with the sealing part of the heavy packaging bag to perform heat sealing, and returns to the initial position after sealing, and usually a heavy packaging bag. The bag remains at an initial position in a direction substantially perpendicular to the transport direction, and after heat sealing, the sealed part is rotated by engagement with the heat sealed part of the bag to compress and shape the sealed part. There is provided an automatic sealing device for an injection port of a heavy packaging bag, characterized by comprising a post-processing means having a pressing member that returns to an initial position.

According to a second aspect of the present invention, there is provided an automatic sealing device for a filling port of a heavy packaging bag, which is attached to a conveying means for a heavy packaging bag, and the initial stage is generally perpendicular to the transport direction of the heavy packaging bag. a heat sealing means having a heater that remains in position and rotates while translating with the bag due to engagement with the sealing portion of the heavy packaging bag, and returns to the initial position after sealing; Normally, the heavy packaging bag remains at an initial position in a direction substantially perpendicular to the transport direction, and after heat sealing, the bag is rotated by engagement with the heat sealing part of the bag to compress and shape the sealing part; There is provided an automatic sealing device for an injection port of a heavy packaging bag, characterized by comprising a post-processing means having a pressing member that returns to the initial position after the compression shaping.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the inlet sealing device for a heavy-duty paper bag according to the present invention will be described in detail with reference to preferred embodiments shown in the drawings.

FIG. 1 shows the structure of an internal valve type double-bottomed paper bag 1 applied to the device of the present invention. This paper bag 1 has both bottom surfaces (first side surfaces) sealed, one bottom surface is provided with a valve (not shown) as shown in the figure, and the bottom surface is covered with a sealing piece 2 to cover the valve opening. A powder inlet 5 is formed between the bottom piece 6 to which the sealing piece 2 is attached and the bottom piece 7 below it. The sealing device of the present invention comprises a paper bag 1
The bottom part 4 of the sealing piece 2 and the free part 3 of the sealing piece 2 are heat-sealed to tightly and automatically seal the injection port 5.

A plan view of the automatic injection port sealing device of the present invention is shown in FIG. 2, and a side view is shown in FIG. 3. Belt conveyor 11
The rollers 14 are attached to a frame 13 supported by a support 12, and an endless belt 15 is wound around these rollers 14. The part for heat sealing is frame 1 of belt conveyor 11.
3, and heat sealing means 16 in order from the upstream side.
and post-processing means 17.

The heat sealing means 16 includes an arm 19 rotatably attached to a shaft 18 fixedly erected on the frame 13, a heater 20 attached to the free end of the arm, and a base side of the arm 19. A tension spring 22 stretched between the frame 13 and the stand 12
and a stopper 23 fixed on the frame 13 so as to stop the arm 19 at a predetermined angle with respect to the belt 15.

The post-processing means 17 shapes the portion where the free piece 3 of the sealing piece 2 of the packaging bag 1 and the bottom pieces 6 and 7 are heat-sealed by the upstream heat-sealing means 16.
This is for more complete sealing.
Since the structure is exactly the same except that a hard-bristled brush 24 is provided on the arm 25 instead of the heater 20, a detailed explanation thereof will be omitted and the same parts will be designated by the same numbers. However, since it is not necessary to have the same structure, you are free to change the design as necessary. A brush is most suitable, but any other device having similar pressing and shaping effects, such as a pressing plate, may be used.

Further, it is preferable to provide a guide 26 for the heavy packaging bag opposite the portion where the heat sealing means 16 and post-processing means 17 described above are provided.

If it is desirable to bring the heater 20 of the heat sealing means 16 into contact with the sealing part of the heavy packaging bag 1 for a longer period of time to achieve more complete heat sealing, it is possible to do so as shown diagrammatically in FIG. It is better to configure That is, in addition to the configuration shown in FIG. 2, a guide rail 27 is provided on the frame 13 in parallel with the conveyor belt 15.
A slider 28 is mounted on this guide rail 27.
, and set the shaft 18 upright on this slider.
An arm 19 is attached to this, and a tension spring 29 is installed between the slider 28 and the stand 21 on the frame 13.
Stretch it. Thereby, when the heater 20 is engaged with the packaging bag 1, it rotates while moving in the moving direction of the belt 15, so that the sealing can be performed more completely. It should be noted that the tension springs 22 and 29 may be constructed using fluid actuation means such as air or hydraulic pressure.

Next, the operation of the automatic sealing device for injection ports of heavy packaging bags according to the present invention will be briefly explained with reference to FIG.

The heavy packaging bag 1 that has been placed on the conveyor belt 15 and conveyed is shown by the arrow 3 as shown in FIG. 5a.
Move in the direction of 0. At this time, arm 19 of heat sealing means 16 and arm 25 of post-processing means 17
comes into contact with the stopper 23 by the action of the tension spring 22, and the heater 20 and the brush 24 are oriented in a direction substantially perpendicular to the direction of movement of the belt 15.
The belt 15 is attached so that it can be hooked onto the sealing part 31 of the bag 1.
It extends above.

When the bag 1 hits the guide 26, its position is adjusted appropriately, and the bag moves forward, the sealing part 31 of the bag 1 first comes into contact with the heater 20, as shown in FIG. Rotate around 18. During this time, the sealing part 31 of the bag 1 is brought into contact with the heater 20 and heated, thereby being heat-sealed.

When the heat sealing of the sealing part 31 of the bag 1 is completed as shown in FIG. While suppressing and shaping, it blends in with even more gaps and seals completely. (4th c.
(See figure) As the bag 1 moves further along with the belt conveyor, as it no longer comes into contact with the bag 1, the heater 20 and then the brush 24 are rotated around the shaft 18 by the action of the tension spring 22, as shown in Figure 5d. It rotates counterclockwise and returns to the initial state shown in FIG. 5a, ready for heat sealing the next bag. In this way, the bags 1 are sealed one after another.

Further, in the example described with reference to FIG. 4, as the sealing part 31 of the bag 1 comes into contact with the heater 20 and moves forward to push it, the tension spring 29 expands and the slider 28 moves together with the conveyor belt 15. When the tension spring 29 reaches its limit, the slider 28 stops and the heater 20 begins to rotate against the tension spring 22. Therefore, the contact between the heater 20 and the sealing part 31 of the bag 1, that is, the heating time, increases by the movement time of the slider 28, and the heat sealing is performed more completely.

As is clear from the above explanation, in the device of the present invention, only the sealing part of the heavy packaging bag is sealed by the rotational movement or translational and rotational movement of the heater.
Heat sealing is performed by heating with a heater, and then a post-processing process is performed in which the heat-sealed area is suppressed with a brush, so the heat sealing is completed perfectly.This sealing device has an extremely simple structure and has excellent work efficiency. ing.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a heavy-duty packaging bag, FIG. 2 is a plan view of an automatic sealing device for an injection port of a heavy-duty packaging bag according to the present invention, FIG. 3 is a side view of the same, and FIG. FIG. 5 is a diagrammatic plan view for explaining the operation of the apparatus of the present invention. Explanation of symbols, 1... Heavy packaging bag, 2... Sealing piece,
3...Free part, 4...Bottom part, 5...Inlet, 6,
7... Bottom piece, 11... Belt conveyor, 12...
...Strut, 13...Frame, 14...Roller, 1
5... Belt, 16... Heat sealing means, 17... Post-processing means, 18... Shaft, 19... Arm, 20...
... Heater, 21 ... Stand, 22 ... Tension spring, 23 ... Stopper, 24 ... Brush, 25 ...
...Arm, 26...Guide, 27...Guide rail, 28...Slider, 29...Tension spring, 30
...Moving direction, 31... Sealing part.

Claims (1)

[Scope of Claims] 1. An automatic sealing device for a filling port of a heavy packaging bag, which is attached to a transportation means for a heavy packaging bag, and which normally stops at an initial position in a direction substantially perpendicular to the direction of transport of the heavy packaging bag. , a heat sealing means having a heater that performs heat sealing while rotating by engaging with the sealing part of the heavy packaging bag, and returns to the initial position after sealing; It stays at an initial position in a direction that is approximately at right angles, and after heat sealing, it rotates by engaging with the heat sealing part of the bag to compress and shape the sealed part, and returns to the initial position after the compression shaping. 1. An automatic sealing device for an injection port of a heavy packaging bag, comprising a post-processing means having a pressing member. 2. The automatic injection port sealing device for a heavy packaging bag according to claim 1, wherein the pressing member is a hard brush. 3. An automatic sealing device for the filling port of heavy packaging bags, which is attached to the transportation means for heavy packaging bags, and normally stops at an initial position in a direction approximately perpendicular to the transport direction of the heavy packaging bags, and seals the heavy packaging bags. A heat sealing means having a heater that performs heat sealing while rotating and translating with the bag by engaging with the bag, and returns to the initial position after sealing, and a heat sealing means that is usually moved approximately in the direction of transport of the heavy packaging bag. It stays at the initial position in the perpendicular direction, and after heat sealing, it rotates by engaging with the heat sealing part of the bag to compress and shape the sealing part, and after the compression shaping, returns to the initial position. 1. An automatic sealing device for an injection port of a heavy packaging bag, comprising a post-processing means having a pressing member. 4. The automatic injection port sealing device for a heavy packaging bag according to claim 3, wherein the pressing member is a hard brush.