JPH04317903A - Heat seal device - Google Patents

Abstract

PURPOSE:To simplify the structure of heat seal device and reduce the cost thereof by heating a fusing portion and a welding portion up to two different temperatures using a single heat source. CONSTITUTION:A heat plate 4 is provided on a surface of a seal bar 1 that confronts with a pressing bar 2. A fusing portion 5 is formed on the vertical portion of the heat plate 4, and welding portions 6 are formed on the upper portion and the lower portion of the heat plate 4. A heat conductor 8 for transmitting heat of a heat source 7 disposed in the interior of the seal bar 1 to the heat plate 4 is integrally connected to the vertical central portion of the heat plate 4. Slits 9 are bored in the heat plate 4 between the upper and lower welding portions 6 and the fusing portion 5. Heat transmission to the welding portions 6 is restrained by the slits 8 so that the temperature of the welding potions 6 is made lower than the temperature of the fusing portion 5.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a heat-sealing device used, for example, in bagging garbage such as garbage when dumping it.

0002

2. Description of the Related Art Generally, when a tube-shaped pack film is continuously fed and packed into bags, it is efficient to weld and seal the pack film and simultaneously cut it by fusing. However, the temperature at which the pack film is welded and the temperature at which it is fused are different, and conventionally, the welded part and the fused part are heated by separate heat sources.

0003

[Problems to be Solved by the Invention] However, in the above conventional example, if the welded part and the cut part are heated with separate heat sources, multiple heat sources are required, which makes the structure complex and increases the cost. The problem is that it is expensive. The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to be able to heat the welded part and the fused part with one heat source, simplify the structure, and reduce the cost. Our goal is to provide a heat sealing device that can

0004

[Means for Solving the Problems] In order to solve the above-mentioned problems, the heat sealing device of the present invention has a heat sealing device in which a tubular pack film 3 is sandwiched between a seal bar 1 and a presser bar 2 which can be freely approached and separated from each other. In a heat sealing device that welds 3 and cuts the pack film 3,
A heating platen 4 is provided on the surface of the seal bar 1 facing the pressing bar 2, a fusing part 5 is formed in the vertical center of the heating platen 4, and welding parts 6 are formed at the upper and lower parts of the heating platen 4 to form a seal. A thermal conductor 8 that transfers heat from a heat source 7 provided inside the bar 1 to the hot platen 4 is integrally connected to the vertical center of the hot platen 4, and is connected between the upper and lower welded parts 6 and the cutout part 5. It is characterized by having slits 9 formed in a heating plate 4.

[0005]

[Operation] The pack film 3 is held between the seal bar 1 and the presser bar 2, and the pack film 3 is welded and sealed at the welding part 6, and at the same time, the pack film 3 is fused and cut at the fusing part 5. At this time, the heat platen 4 of the seal bar 1 is heated by the heat source 7, and the heat is transferred from the heat source 7 to the fusing portion 5 of the heat platen 4.
The heat is transmitted to the welded part 6 through the slit 9 between the welded part 5 and the welded part 6, and the heat transfer to the welded part 6 is suppressed.
The temperature of the welded part 6 is lower than the temperature of the fused part 5. Therefore, even if the fusing part 5 and the welding part 6 are heated by the same heat source 7, welding and fusing can be performed at appropriate temperatures.

[0006]

[Embodiment] As shown in FIGS. 4 and 5, a garbage inlet 10 for inputting garbage such as kitchen garbage is provided on the top surface of a garbage bagging device using the heat sealing device of the present invention. 10 is attached with a guide 11 for guiding the dust and preventing leakage of the dust. The guide 11 is designed to be easily attached and detached so that it can be cleaned if it becomes dirty, and a lid can be attached when not in use. There is a pack material holding part 12 below the garbage inlet 10, which holds a pack cassette made by folding a tube-shaped pack film 3 into a cassette as shown in FIG.
A bag of the packing film 3 is formed below the garbage inlet 10 to receive the garbage. A feeding mechanism 13 that pulls the pack film 3 and sends it to the sealing area, and a sealing mechanism 14 that heat-seals the pack film 3 are disposed below this.

The feeding mechanism 13 brings the driving roller 15 and the driven roller 16 into contact with each other as shown in FIG.
The pack film 3 is fed by the rotation of 6. The drive roller 15 transfers the power of the motor 17 to the transmission shaft 1.
8. Rotates by transmission via transmission belt 19;
A driven roller 16 held down by a spring 20 is driven to rotate. There are two pairs of drive rollers 15 and driven rollers 16 on the left and right in order to sandwich and feed the pack film 3 on both sides.

The seal mechanism 14 has a structure as shown in FIG. 7, in which a seal bar 1 and a presser bar 2 reciprocate in opposing directions to open and close the seal portion. This operation is performed by rotating the screw shaft 21. The screw shaft 21 has a right-hand thread 21a on one side and a left-hand thread 21b on the opposite side with the center as a boundary, and is screwed into both ends of the seal bar 1 and the presser bar 2, respectively. The two screw shafts 21 are rotated in conjunction with each other by a timing belt 22. The two screw shafts 21 are rotated by power transmitted from a motor 23 that can freely rotate in forward and reverse directions by a timing belt 23a, and a left-hand screw nut is installed in the shaft hole of the seal bar 1, and a left-hand screw nut is installed in the shaft hole of the presser bar 2. Since a right-handed screw nut is provided, the seal bar 1 and the presser bar 2 move in the direction of closing or opening by the action of the right-handed screw 21a and left-handed screw 21b of the screw shaft 21. When the seal bar 1 and the presser bar 1 are closed, the pack film 3 between the seal bar 1 and the presser bar 2 is sandwiched, heated and welded to form a seal, and is fused and cut.

The structure of the seal bar 1 is shown in FIG. A heating plate 4 is attached to the surface of the seal bar 1 facing the presser bar 2 in the longitudinal direction, and the heat conductor 8 provided inside the seal bar 1 and the heating plate 4 are integrated. The heating plate 4 and the heat conductor 8 are made of metal such as aluminum. The thermal conductor 8 is the upper thermal conductor 8a.
As shown in FIG. 3, the upper thermal conductor 8a is integrally formed with the hot platen 4 at the vertical center of the hot platen 4, and the lower thermal conductor 8b is formed of the hot platen 4. 4 and upper thermal conductor 8a
It is molded separately. Heat source 7 like PTC heater
is sandwiched between the upper thermal conductor 8a and the lower thermal conductor 8b via an insulating material and an adhesive 25, and the upper thermal conductor 8a and the lower thermal conductor 8b are integrally joined. Here, 26 is an electrode of the heat source 7, 27 is a thermal fuse, and 28 is a thermistor for temperature control. There is a presser bar 2 in the vertical center of the heating plate 4.
A welding section 5 is provided which is raised so as to protrude toward the heating plate 4, and welding sections 6 are provided above and below the heating plate 4. The fusing part 5 and the welding part 6 are connected by a connecting part 29 which is thinner than the welding part 6, and the connecting part 29 is provided with a large number of slits 9 in the longitudinal direction as shown in FIG. . Heat from the heat source 7 is transmitted via the thermal conductor 8 to the fusing part 5 in the center of the hot platen 4, and from the fusing part 5 to the welding part 6 via the connecting part 29. When heat is transferred from the fusing part 5 to the welding part 6 via the connection part 29, the thinness of the connection part 29 and the presence of the slits 9 deteriorate the heat transfer, and the temperature of the welding part becomes lower than the temperature of the fusing part 5. 6 temperature becomes lower. At this time, the slit 9 is provided so that the temperature of the welded part 6 is about 20° C. lower than the temperature of the fused part 5. Specifically, when the pack film 3 is made of high-density polyethylene, the welded part 6 is heated to about 135 to 145°C, and the fused part 5 is heated to 165°C or higher. In the case of low density polyethylene, the welded part 6 is heated to about 115 to 125°C, and the fused part 5 is heated to 145°C or higher. A silicone rubber 30 is attached to the presser bar 2 so as to face the heating plate 4 of the seal bar 1.
A recess 31 is provided in a portion facing the fusing portion 5 of 0. When the pack film 3 is sandwiched between the seal bar 1 and the presser bar 2 and heated by the heat source 7, the film is welded and sealed at the heated part at the welding part 6, and the film is heated at the welding part 5. It is fused in some parts.

Next, the operation of the garbage bagging device will be explained based on FIG. The initial state is shown in FIG. 8(a), in which the driving roller 15 and the driven roller 16 of the feeding mechanism 13 sandwich the pack film 3 on both sides, and the lower end of the pack film 3 is sealed by welding. Cage, seal mechanism 1
The seal bar 1 and presser bar 2 of No. 4 are in an open state. In this state, garbage 32 such as kitchen garbage is thrown into the bag portion of the pack film 3 formed in the pack material holding portion 12 from the garbage inlet 10 via the guide 11. The thrown garbage 32 is temporarily received as shown in FIG. 8(b). Next, when the switch is turned on, the bag is fed by the feeding mechanism 13 so that the opening of the bag comes to the sealing part, as shown in FIG. 8(c), and then stopped. Next, the sealing mechanism 14 is activated, and the sealing bar 1 and the holding bar 2 are closed as shown in FIG. It is sealed and also fused at the fusion cut portion 5 . Next, as shown in FIG. 8(e), the seal bar 1 and the presser bar 2 are opened, and the packed bag falls into the garbage stocker 33 provided at the bottom due to its own weight, returning to the initial state. And Figure 8(a)(b)(c)(
d) The operation in (e) can be repeated and used continuously.

[0011]

Effects of the Invention As described above, the present invention provides a heating plate on the surface of the seal bar facing the presser bar, forms a welded part in the vertical center of the heating plate, and has welded parts at the upper and lower parts of the heating plate. A thermal conductor that transfers heat from a heat source provided inside the seal bar to the hot platen is integrally connected to the vertical center of the hot platen, and the hot platen is connected between the upper and lower welded parts and the fused part. Since the slits are drilled in the heat source, heat is transferred from the heat source to the welded part via the fusing part of the heating plate, and the slit between the welded part and the welded part suppresses the heat transfer to the welded part. The temperature of the welded part is lower than the temperature of the welded part, and even if it is heated with a single heat source, the welded part can be heated to a temperature suitable for fusing, and the welded part can be heated to a temperature suitable for welding to perform fusing and welding. The structure can be simplified and the cost can be lowered compared to the conventional one.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the main parts of the heat sealing device of the present invention.

FIG. 2 is a diagram showing a heat plate and a heat conductor same as above, and (
(a) is a plan view, (b) is a front view, and (c) is a side view.

FIG. 3 is an exploded side view showing a heating plate and a heat conductor according to the above.

FIG. 4 is a perspective view of a garbage bagging device using the heat sealing device same as above.

FIG. 5 is a cross-sectional view of FIG. 4;

FIG. 6 is a perspective view of the feeding mechanism same as above.

FIG. 7 is a perspective view of the sealing mechanism same as above.

FIG. 8 is an explanatory diagram illustrating the operation of bagging garbage according to the above.

FIG. 9 is a diagram showing a pack cassette of the same pack film as above, in which (a) is a perspective view and (b) is a sectional view.

[Explanation of symbols]

1 Seal bar 2 Holding bar 3 Pack film 4 Heat plate 5 Fused part 6 Welded part 7 Heat source 8 Thermal conductor 9 Slit

Claims (1)

[Claims] Claim 1: In a heat sealing device that welds the pack film by sandwiching a tubular pack film between a seal bar and a press bar that can be freely moved close to and apart from each other, and also melts and cuts the pack film, the press bar of the seal bar A heating plate is provided on the surface facing the seal bar, a fusing part is formed in the vertical center of the heating plate, and a welding part is formed at the top and bottom of the heating plate, so that the heat from the heat source provided inside the seal bar is transferred to the heating plate. A heat conductor that transmits heat is integrally connected to the vertical center of the heating plate,
A heat sealing device characterized in that a slit is bored in a hot platen between an upper and lower welded part and a fused part.