JPH0680125A - Heat-sealer in packing device - Google Patents

Abstract

PURPOSE:To provide an excellent heat-sealer in a packing device by which appropriate heat-sealing can be always carried out even when the temperature of the sealing part just before sealing varies due to the outside air temperature or the cooled condition and electric wires do not break at the ends of heating wire even if the heating wires in the sealing part is constricted or extended due to the thermal expansive action. CONSTITUTION:A thermal detector 7 detecting the temperature before sealing in the sealing part 6 is equipped at the sealing part 6 and a current controller 8 regulating current to the sealing part 6 heating the part in accordance with the temperature before sealing detected by the thermal detector 7. A plate spring 9 is protruded at the end of the sealing part 6. The end of heating wires 10 arranged in the sealing part 6 is connected to the elastically movable protruded end 9A of this plate spring 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat sealing device in a packaging device.

[0002]

2. Description of the Related Art As a packaging device of this type, a heat-sealing device for drawing and feeding a long film, pulling and supplying the film in a half-folded state with the upper edge side as an open portion, and heat-sealing the supplied film, A packaging device is configured by a package storage device that stores a package in a bag-shaped film by the heat sealing and a film cutting device that cuts a predetermined position of the film.

In this case, a film having a predetermined width folded in a V shape having an opening on the upper edge side is drawn out and supplied from a film supply unit, and the film supplied and transferred is provided with two longitudinal seals at a small interval. Is applied one after another with a heat-sealing device at intervals of one bag, and is cut in advance with a film cutting device leaving a little upper end of the film between these two vertical seals,
With this vertical seal, the upper opening of the film bag formed between the vertical seals is opened by the package storage device, the package is loaded, and the upper opening of the film bag after storing the package is horizontally transferred by the heat seal device. The film is sealed and sealed, the uncut portion left in advance is cut off and cut by a cutting device, and the film packaging bag containing the package is transferred and discharged one after another.

[0004]

In the heat sealing device in such a packaging device, the seal portion heated by energizing the heater wire is moved to the seal base, and the range of the film to be sealed is sealed with the seal portion. It is sandwiched with a table and heat-sealed.

In such a heat seal device, if the temperature of the seal portion is low or the heat seal time is not sufficient, the heat seal cannot be satisfactorily performed. On the contrary, the seal portion is too hot or the heat seal time is long. If it is too long, the film will melt and break. In this respect, the heat sealing time for holding the film between the seal part and the seal base is short, and it is difficult to adjust this heat seal time, so the amount of electricity to the heater wire of the seal part is properly set. In the conventional heat seal device, it is simply uniquely set in advance according to the type of film.

However, the temperature of the seal base immediately before the heat sealing slightly changes depending on the outside air temperature or the cooling condition. Therefore, due to this temperature change, heat sealing cannot be performed well with the same energization amount, or conversely overheating occurs. In some cases, a problem such as film breakage may occur due to the state.

In such a heat seal device,
Since the heater wire arranged in the seal part expands and contracts due to thermal expansion, this expansion and contraction force is applied to the connection part of the heater wire,
There was a problem such as disconnection. Conventionally, various means have been proposed in order to solve the disconnection problem, but all the structures are complicated, the manufacturing cost is very high, and they cannot be easily adopted as a solving means.

An object of the present invention is to provide a heat sealing device in a packaging device that solves such problems.

[0009]

The gist of the present invention will be described with reference to the accompanying drawings.

A heat sealing device 2 for heat sealing the supplied film 1, a package storing device 4 for storing a package 3 in the bag 1 formed by the heat sealing, and a predetermined position of the film 1. In the heat sealing device 2 in the packaging device a, which comprises the film cutting device 5 for cutting
A temperature detection unit 7 for detecting the pre-sealing temperature of the seal unit 6 is provided in the seal unit 6, and the seal unit 6 is heated to heat the seal unit 6 according to the pre-sealing temperature of the seal unit 6 detected by the temperature detection unit 7. The present invention relates to a heat sealing device in a packaging device, which is provided with an energization control unit 8 for controlling an energization amount.

Further, a heat sealing device 2 for heat sealing the supplied film 1, and a package storage device 4 for storing a package in the bag 1 formed by the heat sealing.
In the heat sealing device 2 in the packaging device a including the film cutting device 5 that cuts the film 1 at a predetermined position, the leaf spring material 9 is projectingly provided at the end of the sealing portion 6, and the leaf spring material 9 is elastically movable. When the end of the heater wire 10 arranged in the seal portion 6 is connected to the obtained protruding end 9A and the heater wire 10 itself expands and contracts due to a thermal expansion action, the end of the heater wire 10 is elastic of the leaf spring material 9. The present invention relates to a heat sealing device in a packaging device, which is configured to be movable against a force.

[0012]

The invention according to claim 1 will be described.

Before heat sealing, the temperature of the seal portion 6 is detected by the temperature detecting portion 7.

The energization amount to the seal portion 6 is controlled by the energization controller 8 in accordance with the change in the temperature detected by the temperature detector 7.

Therefore, when the temperature of the seal portion 6 before the sealing changes due to the influence of the increase of the outside temperature or the decrease of the cooling effect, it is necessary to prevent overheating unless the energization amount is changed as it is. Depending on the condition, the amount of electricity is reduced to maintain an appropriate heat seal state.

The invention according to claim 2 will be described.

Even if the heater wire 10 itself expands or contracts due to the thermal expansion action, this expansion / contraction force does not directly act on the connection portion of the end of the heater wire 10 with the lead wire 17, and the leaf spring material 9 corresponding to this expansion / contraction. The projecting end 9A of the leaf spring material 9 is moved against the elastic force of, and the expansion / contraction force is relaxed.

[0018]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, the film 1 having a predetermined width folded in a V shape is drawn by the chuck device 11 and drawn out from the film supply unit 12, and as shown in FIG. And two vertical seals 19 are provided one by one at intervals of one bag by the heat sealing device 2A.

The two vertical seals 19 are preliminarily cut by a film cutting device 5 with a little left at the upper end, and the upper opening of the film bag formed between the vertical seals 19 by the vertical seals 19 is inserted into the package storage device 4. Open and insert the package 3.

The upper opening of the film bag which has finished storing the package 3 is sealed by a horizontal seal 20 by the heat sealing device 2B, and the uncut portion 21 left in advance is cut off and cut by the cutting device 16, The film packaging bags 13 containing the objects 3 are discharged one after another. In the packaging device a having the above-described configuration, the present embodiment is one in which the present invention is applied to the heat sealing device 2A and the heat sealing device 2B of the packaging device a shown in FIGS. 1, 2, and 3.

That is, the heater wire 10 is energized to provide the heat seal portion 6
Is heated, and the heated seal portion 6 is moved to the seal base 15 by the movable device 14, and the area of the film 1 to be sealed is sandwiched between the seal portion 6 and the seal base 15 to perform heat sealing.

First, an embodiment according to the invention described in claim 1 will be described with reference to FIG.

In this embodiment, a temperature detecting section 7 for detecting the temperature of the seal section 6 itself is attached to the center of the side portion of the metal seal section 6 heated by the heater wire 10, and the temperature detecting section 7 is energized. It is connected to the control unit 8.

The energization control section 8 is provided in the packaging device a and is provided with an operation section and a display section.

In the present embodiment, for example, if the temperature immediately before the seal of the seal portion 6 before being detected by the temperature detecting portion 7 by this operation portion is 30 degrees or less, it is 0.9 seconds, and if the temperature is 30 degrees to 40 degrees, it is 0.9 seconds. 8 seconds, 0.7 seconds for 40 to 50 degrees, 0.6 seconds for 50 degrees or more, and a preset program to energize with a predetermined voltage according to changes in various conditions such as type of film 1 and voltage change , So that different patterns can be programmed. Therefore, since it is difficult to finely adjust the sealing time at the time of heat sealing (the time for holding the film 1 between the sealing portion 6 and the sealing base 15), the energization control is performed according to the temperature change immediately before the sealing of the sealing portion 6. By controlling the energization time to the heater wire 10 by the part 8, even if the outside air temperature or the cooling condition changes, the heating temperature of the seal part 6 is always kept properly and good heat sealing is performed. Is also trying to save.

Next, an embodiment according to the invention of claim 2 will be described with reference to FIG.

Insulating mounts 18 are attached to both ends of the seal portion 6, and one end of a U-shaped stainless steel plate spring material 9 which does not rust is attached to each of the mounts 18 and is projected. The protruding end 9A, which is the other end, is configured to be elastically movable by bending in the length direction of the seal portion 6.

An end of an impulse heater wire 10 stretched along the seal portion 6 is connected to the protruding end 9A. A lead wire connected to the end of the heater wire 10 at the protruding end 9A
The ends of 17 are connected, and the power supply and the heater wire 10 are connected.

Therefore, the connecting portion between the heater wire 10 and the lead wire 17 is provided at the projecting end portion 9A of the leaf spring material 9.

Therefore, in this embodiment, the heater wire 10 is energized by energizing.
Even if the heater wire 10 expands or contracts due to the thermal expansion effect due to the heat change that heats up or cools down due to the stop of energization, this expanding force does not directly apply to the connecting portion, and this expanding force causes the protruding end portion 9A to elastically move. Since it is movable against, the expansion and contraction force is relieved and the connection portion is prevented from being broken.
The present invention is not limited to the above-described embodiment, and the configuration of the packaging device to be applied, the structure of the heat sealing device, and the like can be appropriately designed.

[0032]

Since the present invention is configured as described above, according to the invention of claim 1, even if the temperature of the seal portion before sealing changes due to changes in the outside air temperature, cooling conditions, etc. The amount of electricity supplied to the sealing part is controlled, the proper heat sealing state is always maintained, and heat sealing cannot be performed well, or the film is not broken due to overheating. It becomes a heat sealing device in packaging equipment.

In the invention of claim 2, even if
Even if the heater wire itself expands and contracts due to the thermal expansion effect, this expansion and contraction force does not act directly on the connection part of the heater wire end with the lead wire, and this expansion and contraction resists the elastic force of the leaf spring material. The protruding end of the spring material moves, the expansion and contraction force is relieved, and the connection part of the heater wire is prevented from breaking due to the expansion and contraction force
Moreover, since it has an extremely simple structure, it is easy to manufacture, does not cost, and is an extremely excellent heat sealing device in a packaging device.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a packaging device.

FIG. 2 is a schematic front view of the packaging device.

FIG. 3 is an explanatory view showing a film sealing state of the packaging device.

FIG. 4 is a schematic explanatory diagram of the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 film 2 heat seal device 3 package 4 package storage device 5 film cutting device a packaging device 6 seal part 6 7 temperature detection part 8 energization control part 9 leaf spring material 9A protruding end part 10 heater wire

Claims (2)

[Claims] 1. A heat-sealing device for heat-sealing a supplied film, a package storage device for storing a package in the bag-shaped film by the heat-sealing, and a film for cutting a predetermined position of the film. In a heat sealing device in a packaging device including a cutting device, a temperature detecting unit for detecting the pre-sealing temperature of the sealing unit is provided in the sealing unit, and the sealing unit is set according to the pre-sealing temperature of the sealing unit detected by the temperature detecting unit. A heat-sealing device in a packaging device, comprising an energization control unit for controlling the amount of electricity supplied to a heat-sealing unit. 2. A heat-sealing device for heat-sealing a supplied film, a package storage device for storing a package in the bag-shaped film by the heat-sealing, and a film for cutting a predetermined position of the film. In a heat-sealing device in a packaging device including a cutting device, a leaf spring material is projectingly provided at an end portion of the seal portion, and an end portion of a heater wire arranged in the seal portion at an elastically movable protruding end portion of the leaf spring material. When the heater wire itself expands and contracts due to the thermal expansion effect, the end portion of the heater wire can move against the elastic force of the leaf spring material. apparatus.