JPH11292031A - Sealer and method for sealing package bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealer which can degas simultaneously at the time of heat-sealing. SOLUTION: Two heater portions 1 for interposing an opening end of a packaging bag to be heat-sealed from outside to heat-contact-bond are oppositely placed so that they can come closer to or farther away from each other, and a flexible pressing plate 2 hang-supported with an upper end fixed is provided below each heater portion 1. As a result, heat-sealing is done after the pressing plate 2 has excluded air in an upper part of the packaging bag, so that a degassing process and a sealing process can be performed simultaneously, thereby reducing entire process cycle time and further simplifying facilities.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing machine for heat-sealing a wrapper.

[0002]

2. Description of the Related Art After using a wrapper coated with a thermoplastic resin on its inner surface and filling the contents in the wrapper,
The opening at the upper end of the wrapper is sandwiched between two heater plates from both sides, the resin layer of the wrapper is thermocompression-bonded, the upper end of the wrapper is heat-sealed, and then the sewing machine is used to seal. Heat sealing methods are widely known.

[0003]

However, in the above-mentioned heat sealing method for sealing, during the thermocompression bonding, the air bag is sealed with excess air remaining in the bag, so that the volume of the bag is reduced. It became large by the amount of air, causing waste in storage and transportation. Therefore, in order to release air, it is necessary to push the zipper bag by hand before performing sealing, which is troublesome, and when a machine for bleeding air is used, the number of steps increases by one. There is a problem that the process time becomes long.

[0004] The present invention has been made in view of the above points, and an object of the present invention is to provide a sealing machine capable of simultaneously performing degassing during heat sealing.

[0005]

The sealing machine according to the present invention comprises:
Two heater plates 1 for sandwiching the open end of the heat-sealing wrapper 3 from the outside and thermocompression-bonding are arranged so as to be close to and away from each other, and the upper end is fixed below each heater plate 1 so as to be suspended. It is characterized in that it is provided with a holding plate 2 having flexibility.

[0006] The sealing machine according to claim 2 of the present invention is characterized in that
In addition to the features of the sealing machine described in 1, heating surface 4 of heater plate 1
Has an uneven shape.

[0007] The sealing machine according to claim 3 of the present invention is characterized in that
In addition to the features of the sealing machine described in 1 or 2, an air duct 5 is arranged above the heater plate 1.

[0008] In the sealing method according to the present invention, by using the sealing machine according to any one of claims 1 to 3, the bag 3 containing the powder is pressed from the outside by the pressing plate 2, and at the same time, the heater plate 1 is pressed. In this case, the open end of the wrapper 3 is thermocompression-bonded.

[0009]

Embodiments of the present invention will be described below.

FIG. 1 shows an example of the sealing machine of the present invention. Two heater plates 1 are arranged in parallel with the heating surface 4 facing each other. The heater plate 1 is formed by providing a heater inside a hot plate, and the heater is not particularly limited as long as it can obtain a temperature suitable for performing heat sealing. An electric heater and the like can be exemplified. In the present invention, a heater plate 1 using a pair of electric heaters of 600 w is shown.

The two heater plates 1 are usually separated from each other by a sufficient distance to allow the upper end of the wrapper 3 to be sealed therebetween, so that the sealing operation of the wrapper 3 can be performed once. To be able to do so, both heater plates 1 are formed longer than the width of the wrapper 3. Both heater plates 1 have a heating surface 4
On the opposite side to the back plate 6. The back plate 6 is further connected to the connector 10 on a surface opposite to the surface joined to the heater plate 1, and the connector 10 is further connected to the heater plate 1.
Are connected to an appropriate device (not shown) that allows the device to be moved close to and away from the device by the action of air pressure or the like. When the device for operating the heater plate 1 is turned on, the two heater plates 1 are brought close to each other while maintaining the parallel state. When the device for operating the heater plate 1 is switched off or a set time has elapsed, the two heater plates 1 are separated again.

Immediately below the heater plate 1, a holding plate 2 is suspended with its upper portion fixed to a back plate 6. The holding plate 2 preferably has flexibility so that the holding plate 2 can be pressed according to the shape of the side surface of the wrapper 3. Rubber and the like can be exemplified as a material of the holding plate 2. In an example of the present invention, the holding plate 2 has a size of 600 mm × 200 mm and a thickness of 10 mm.
mm heat resistant rubber sheet was used.

To seal the open end of the upper end of the envelope 3 coated with the resin layer on the inner surface by using the above-mentioned sealing device, first, for example, a powder such as a molding material is placed in the envelope 3. The contents 8 such as a body are put in, and then the open upper end of the wrapper 3 is inserted between the two heater plates 1 as shown in FIG. Then, the two heater plates 1 and the holding plate 2 are brought close to each other. At this time, as the heater plate 1 and the holding plate 2 approach each other, as shown in FIG. 2B, the holding plate 2 is located above the contents 8 such as powder in the packing bag 3 and below the upper end of the packing bag 3. To expel air present in the upper portion of the wrapper 3 upward. Further, the air in the wrapper 3 is expelled by the holding plate 2 until immediately before the heater plate 1 presses the upper end of the wrapper 3. Finally, the upper end of the wrapper 3 is sandwiched between the two heater plates 1 and the resin layer on the inner surface of the wrapper 3 is fused, and
The upper end opening is sealed. The conditions for pressure bonding of the heater plate during heat sealing include a heating temperature of 180 to 200 ° C., a heating time of 1.5 to 3 seconds, and a pressurization (air pressure) of 5.
It is preferably performed at kg / cm ² .

In another embodiment of the sealing machine of the present invention, the heating surface 4 of the heater plate 1 is provided with irregularities. FIG. 3 shows an example of irregularities on the heating surface 4 of the heater plate 1. FIG. 3 (a) shows a shape in which the convex portions of the heating surface 4 of the two heater plates 1 are abutted to each other, so that the pressure with which the wrapper 3 of the heater plate 1 is sandwiched during the pressing can be increased. It is. FIG. 3B shows a heating surface 4 of one heater plate 1.
Can fit into the concave portion of the heating surface 4 of the other heater plate, so that the area of the crimping surface of the wrapper 3 can be increased.

In another embodiment of the sealing machine of the present invention, as shown in FIG. 4, an air duct 5 capable of sucking dust using a ventilation fan or the like is disposed above a heater plate 1. . If a part of the contents 8 of the wrapper 3 is scattered together with air during degassing by the presser plate 2, the scattered wrapper 3
Can be collected by the air duct 5.

After the above heat sealing, the sealing of the wrapper 3 is completed by a known method such as sewing.

[0017]

As described above, in the sealing machine according to the present invention, two heater plates for sandwiching the open end of the heat-sealing wrapper from the outside and performing thermocompression bonding are arranged so as to be close to and separated from each other. Since a flexible holding plate whose upper end is fixed and suspended and supported is provided below each heater plate, when the heater plate is brought close to and the packing bag is pressed, the upper portion of the inside of the packing bag is held by the holding plate. That can expel air,
The deaeration step and the sealing step can be performed simultaneously without the need for manual work, so that the time of the entire process cycle can be shortened and the equipment can be simplified.

According to a second aspect of the present invention, there is provided a sealing machine.
In addition to the features of the sealing machine described in 1, the heating surface of the heater plate has an uneven shape, so that it is possible to perform pressure bonding strongly and to make sealing more firm.

According to a third aspect of the present invention, there is provided a sealing machine.
In addition to the features of the sealing machine described in either 1 or 2, since the air duct is located on the upper part of the heater plate, it can collect the contents that are the powder of the wrapper that scatters when degassing. It is possible to improve the working environment by preventing scattering of contents such as powder.

The sealing method according to the present invention is characterized in that
Using the sealing machine according to any one of the above, the wrapping bag containing the powder is pressed from the outside by the pressing plate, and at the same time, the open end of the wrapping bag is thermocompression-bonded by the heater plate. The deaeration step and the sealing step can be performed at the same time without the need for manual work, and the time of the entire process cycle can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of an embodiment of the present invention.

FIG. 2 illustrates an example of an embodiment of the present invention.
(a) and (b) are cross-sectional views.

FIG. 3 shows another example of the embodiment of the present invention, and (a) and (b) are cross-sectional views.

FIG. 4 is a sectional view showing another example of the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heater plate 2 Holder plate 3 File bag 4 Heating surface 5 Air duct

Claims (4)

[Claims] 1. Two heater plates for sandwiching an open end of a heat-sealing wrapper from the outside and thermocompression-bonding each other are arranged so as to be close to and away from each other, and the upper ends are fixed below the respective heater plates and suspended. A sealing machine characterized by comprising a flexible holding plate which is supported down. 2. The sealing machine according to claim 1, wherein the heating surface of the heater plate has an uneven shape. 3. The sealing machine according to claim 1, wherein an air duct is arranged above the heater plate. 4. The packaging machine according to claim 1, wherein the packaging bag containing the powder is pressed from the outside by a holding plate, and the opening end of the packaging bag is simultaneously thermocompression-bonded by a heater plate. A method for closing a wrapper bag.