JP3308645B2 - Plastic film fusing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic film fusing apparatus.

[0002]

2. Description of the Related Art For example, in a bag making apparatus for producing a plastic bag, a hot blade is disposed above an endless belt, plastic films are superposed in two layers, and the plastic film is fed by the endless belt. The plastic film passes between the hot blade and the endless belt and is intermittently fed by a fixed length. The plastic film may be overlaid in three or four layers and fed by an endless belt. Further, each time the plastic film is intermittently fed, the hot blade is pushed down toward the plastic film and comes into contact with the plastic film, and the plastic film is sandwiched between the hot blade and the endless belt. Is manufactured.

By the way, in this apparatus, when the hot blade is pulled up from the plastic film after the plastic film is blown, there is a problem that the plastic film sticks to the hot blade and the plastic film is pulled up by the hot blade. Therefore, the hot blade does not separate from the plastic film, and the plastic film is excessively heated, thereby impairing the appearance of the plastic bag. The plastic film is pulled up by the hot blade, and then when the plastic film separates from the hot blade and falls, it may stick to the subsequent plastic film. Sometimes it is not possible to make plastic bags.

Therefore, hitherto, a holding member is arranged on both sides or one side of the hot blade, and when the hot blade is pressed down toward the plastic film, the holding member is pressed down toward the plastic film, and the hot blade contacts the plastic film. Before doing so, the holding member is brought into contact with the plastic film. Thereafter, the hot blade was brought into contact with the plastic film, and the plastic film was blown in that state. After the fusing, the hot blade was first pulled up from the plastic film, and then the holding member was pulled up from the plastic film. Therefore, when the plastic film is pressed by the pressing member and the hot blade is pulled up from the plastic film, even if the plastic film sticks to the hot blade, the plastic film is not pulled up by the hot blade, and the hot blade may be separated from the plastic film. it can.

However, in this case, when the pressing member and the hot blade come into contact with the plastic film and the plastic film is blown off by the hot blade, the pressing member is heated by the radiant heat. Therefore, it is necessary to cool the holding member with cooling water or cooling air, and in addition to the holding member, a supply device for cooling water or cooling air must be specially provided, and the configuration is complicated and the cost is high. There was a problem. Due to the structure, there is also a problem that cleaning and maintenance of the hot blade are not easy. In a device having a plurality of hot blades, when the hot blades are brought close to each other, there is also a problem that the pressing is limited by the pressing member and the hot blades cannot be brought extremely close.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention relates to a plastic film fusing apparatus for fusing a plastic film between a hot blade and an endless belt, thereby fusing the plastic film. ,
There is no need to provide a special holding member and a cooling water or cooling air supply device, the structure is simple, the cost is low, the cleaning and maintenance of the hot blade are easy, The purpose of the present invention is to make it possible to make the hot blades of any type close to each other.

[0007]

According to the present invention, the static electricity generator is disposed so as to face the plastic film and the endless belt. Therefore, static electricity is generated between the plastic film and the endless belt, and the plastic film sticks to the endless belt.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below.

In FIG. 1, this is a bag making apparatus for manufacturing a plastic bag, which has two hot blades 1, which are arranged above an endless belt 2. The endless belt 2 is for feeding the plastic film 3 and is made of a fluororesin such as polytetrafluoroethylene, extends horizontally, and is sandwiched between a pair of upper and lower rubber rollers 4 and 5. Further, among the rubber rollers 4 and 5,
The upper rubber roller 4 is connected to a drive mechanism such as a drive motor. The rubber roller 4 is driven by the drive mechanism, and the rubber roller 4 rotates clockwise in FIG. Also,
The rubber rollers 4 and 5 are connected by gears, and the rubber roller 5 rotates counterclockwise in FIG. 1 in conjunction with the rubber roller 4. Therefore, the endless belt 2 circulates in conjunction with the rubber rollers 4 and 5 and circulates, and the plastic film 3
Is guided to the endless belt 2 through the guide roller 6, is sandwiched between the rubber roller 4 and the endless belt 2, and the plastic film 3 is fed by the rubber roller 4 and the endless belt 2. The plastic film 3 is bent along its center line in the longitudinal direction, is superposed in two layers, passes between the hot blade 1 and the endless belt 2, and is fed to the left in FIG. Two plastic films 3 may be overlaid in two layers.

In the upper stretch of the endless belt 2, a receiving plate 7 is provided below the endless belt 2.
Is provided on the upper surface of the endless belt 2, and the endless belt 2 advances and circulates along the silicon rubber 8. Further, above the receiving plate 7, the hot blades 1 are arranged at intervals S corresponding to the length of the plastic bag in the feeding direction of the plastic film 3, and the hot blades 1 are arranged in the width direction of the plastic film 3. It is connected to a drive mechanism such as a servomotor. Accordingly, the hot blade 1 is operated by the driving mechanism, and is pressed down toward the plastic film 3, the plastic film 3 is sandwiched between the hot blade 1 and the endless belt 2, and is supported by the silicon rubber 8 of the receiving plate 7. Can be.

Further, a suction belt 9 is provided downstream of the hot blade 1, and its start end overlaps the end of the endless belt 2, and its lower surface is located in the same plane as the upper surface of the endless belt 2. The suction belt 9 is also endless and has many holes. Further, in the lower stretch of the suction belt 9, a suction bar 10 is provided on the upper side thereof, and the suction bar 10 has a series of suction grooves. The suction groove opens along the lower stretch of the suction belt 9 and is connected to a vacuum pump. Therefore, the suction groove of the suction bar 10 is evacuated by the vacuum pump, and thereby the holes of the suction belt 9 can be evacuated.

This device has a static electricity generating device 11 such as a DC high voltage applicator. The static electricity generating device 11 is arranged to face the plastic film 3 and the endless belt 2. In this embodiment, between the hot blade 1 and the rubber roller 4, the static electricity generator 11 is disposed above the receiving plate 7 and the endless belt 2, and the receiving plate 11 is made of a conductive material. Therefore, ions can be discharged by the static electricity generator 11 and irradiated on the plastic film 3 and the endless belt 2 to generate static electricity between the plastic film 3 and the endless belt 2.

In this apparatus, when the plastic film 3 is fed by the rubber roller 4 and the endless belt 2, the rubber roller 4 and the endless belt 2 are intermittently driven in a predetermined sequence, and the length of the plastic film 3 is equal to the length of the plastic bag. Is sent intermittently with a stroke equivalent to twice the Furthermore, every time the plastic film 3 is intermittently fed,
The hot blade 1 is pushed down toward the plastic film 3 and comes into contact with the plastic film 3. In each hot blade 1, the plastic film 3 is sandwiched between the hot blade 1 and the endless belt 2, whereby the plastic film 3
Is blown.

After the plastic film 3 is blown,
The hot blade 1 is pulled up from the plastic film 3 and stands by at the original position. Then, plastic film 3
Is sent again, the hot blade 1 is pulled down again, the plastic film 3 is blown again, and this is alternately repeated. Therefore, every time the plastic film 3 is blown, two plastic bags are manufactured at the same time. Furthermore, when the hole of the suction belt 9 is evacuated by the vacuum pump and the suction bar 10 and the plastic film 3 is fed by the endless belt 2, the suction belt 9 is synchronized with the same and corresponds to twice the length of the plastic bag. It is driven intermittently with a stroke. Therefore,
When the plastic bag reaches the end of the endless belt 2, the plastic bag is adsorbed on the lower surface of the suction belt 9,
The plastic bag is fed by the suction belt 9.

In this device, the static electricity generator 11
As a result, corona discharge generates ions, and static electricity is generated between the plastic film 3 and the endless belt 2, and the plastic film 3 sticks to the endless belt 2. Therefore, when the hot blade 1 is pulled up from the plastic film 3 after fusing of the plastic film 3, even if the plastic film 3 sticks to the hot blade 1, the plastic film 3 is not pulled up by the hot blade 1 and the hot blade 1 is It can be released from the film 3. Therefore, the plastic film 3 is not excessively heated, and the appearance of the plastic bag is not impaired.
There is no problem that the pulled-up plastic film 3 separates from the hot blade 1, falls, and sticks to the subsequent plastic film 3.

In the case of this device, the static electricity generator 1
Even if there is no 1, the endless belt 2 is made of silicon rubber 8
And the friction acts on the endless belt 2 to generate static electricity between the plastic film 3 and the endless belt 2, but the suction force is small. For this reason, the plastic film 3 sticks to the hot blade 1, and it cannot be avoided that the plastic film 3 is pulled up by the hot blade 1. Therefore, it is necessary to generate static electricity by the static electricity generating device 11 to securely adhere the plastic film 3 and the endless belt 2.

[0017]

As described above, according to the present invention, static electricity is generated between the plastic film 3 and the endless belt 2, and the plastic film 3 sticks to the endless belt 2. Therefore, when the hot blade 1 is pulled up from the plastic film 3 after fusing of the plastic film 3, even if the plastic film 3 sticks to the hot blade 1, the plastic film 3 is not pulled up by the hot blade 1 and the hot blade 1 is It can be released from the film 3. Therefore, the plastic film 3 is not excessively heated, and the appearance of the plastic bag is not impaired. There is no problem that the pulled-up plastic film 3 separates from the hot blade 1, falls, and sticks to the subsequent plastic film 3. There is no need to specially provide a conventional pressing member and a supply device for cooling water or cooling air, the configuration is simple, and the cost is low. Since there is no holding member and a supply device for cooling water or cooling air, cleaning and maintenance of the hot blade 1 are also easy, a plurality of hot blades 1 can be arbitrarily approached, and the intended purpose can be achieved. You can do it.

[Brief description of the drawings]

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat blade 2 Endless belt 3 Plastic film 11 Static electricity generator

Claims (1)

(57) [Claims] A heating blade disposed above the endless belt;
Feeding a plastic film by said endless belt sandwiching the plastic film between the endless belt and the heat knife, in the apparatus so as to blow the plastic film thereby, the ene
Provide a receiving plate under the upper stretch of the dress belt,
The receiving plate and the endless bell
And a conductive material for the receiving plate.
Use, and the cause static electricity between the plastic film and the endless belt, a plastic film blowing device, characterized in that the plastic film and so as to stick to the endless belt.