JP2006290379A - Heat sealing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat sealing device which merely requires preparation of linear heaters having different widths even when packaging bags of various thicknesses and materials are sealed, and thus eliminates the need of preparing a plurality of heat sealers. <P>SOLUTION: According to the heat sealing device, a sealing spot on a resin material is cramped, and a control timer mechanism 2 is actuated to cause a built-in heater 4 to heat the sealing spot for a give time to seal it. The heat sealing device has a sensor T that senses the type of the heater 4, and causes the control timer mechanism 2 to determine and specify a time of electrifying the heater 4 on the basis of a sense result from the sensor T. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat sealing device, and more particularly to a heat sealing device that sandwiches a sealed portion of a resin material and heats and seals the sealed portion with a built-in heater for a predetermined time by operating a timer mechanism.

  An impulse heat seal device (hereinafter sometimes referred to as “heat sealer”) has advantages such as simplicity and certainty for sealing the opening of a packaging bag made of resin film containing contents. It is used a lot. For example, as shown in FIG. 2, the heat sealer presses and clamps a base portion 11 on which a linear heater 10 is mounted, and an opening portion of a packaging bag that is a portion to be sealed facing the base portion 11. And a lever portion 12.

  When the sealed part is sandwiched between the base part 11 and the lever part 12, the energized part is automatically energized / heated, the sealed part is welded and sealed, and the timer mechanism 13 is activated after a certain period of time. It works to stop energization (Patent Document 1).

In that case, a transformer (transformer) 14 corresponding to the resistance value of the heater is mounted so that the sealed portion reaches about 250 ° C. in the maximum time of the timer mechanism 13.
JP 11-342922 A

  However, when sealing the sealed portion of a packaging bag that is actually a sealed object, not only the same thickness and material are handled, but many things of various thicknesses and materials are sealed, and further sealed. In such a case, it may be desirable to change the width of the linear heater, for example, 2 mm, 5 mm, 10 mm, etc., depending on the type of heater wire. There is a problem that it is necessary to prepare as many as possible.

  Accordingly, an object of the present invention is to provide a linear heater having a different width even when sealing a packaging bag of various thicknesses and materials, even if the width of the linear heater is changed, and an appropriate sealed state can be secured. It is simply to provide a heat seal device that does not require preparing a plurality of heat sealers in advance.

  The above-mentioned subject is achieved by the invention described in each claim. That is, the characteristic configuration of the heat sealing device according to the present invention is a heat which sandwiches the sealed portion of the resin material and operates the control timer mechanism to heat and seal the sealed portion with a built-in heater for a predetermined time. The sealing device includes a sensor for detecting the type of the heater, and the control timer mechanism determines and instructs an energization time to the heater based on a detection result of the sensor.

  According to this configuration, the type of the installed heater is determined, and the energization is performed with an appropriate energization time according to the heater type. It can be sealed. Therefore, it is not necessary to prepare a plurality of heat sealing devices only by preparing linear heaters with different line widths, so that the sealing cost can be reduced, and the heat sealing device itself does not need to have a particularly complicated configuration. In addition, since it is not necessary to make the apparatus large, its manufacturing cost is not significantly increased.

  As a result, it is possible to ensure an appropriate sealed state, and even when sealing packaging bags of various thicknesses and materials, it is only necessary to prepare linear heaters with different widths and heat that does not need to prepare multiple heat sealers in advance. A sealing device could be provided.

  Preferably, the sensor is a current sensor connected to either the primary side or the secondary side of the heater transformer, and a detection result of the current sensor is transmitted to the control timer mechanism.

  According to this configuration, the heater type can be more accurately identified, and an instruction from the control timer mechanism can be made more accurate.

  The control timer mechanism preliminarily measures and obtains the heating time until the proper sealing temperature of the heaters having different line widths is reached, and measures the current value to the heater during energization measured by the sensor in advance. It is preferable that the type of heater mounted is determined by comparing the measured value obtained by the sensor with the value stored in the control timer mechanism in advance during actual energization.

  According to this configuration, it is possible to more accurately determine the type of heater that is mounted.

  It is preferable that the time for energizing the heater is determined by selecting a timer time according to the type of heater determined by the control timer mechanism and instructing the result to the driver for opening and closing the transformer.

  According to this configuration, it is possible to determine and execute the energization time to the heater more reliably with a simple configuration.

  An embodiment of a heat seal device according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic circuit diagram of the heat sealing apparatus according to the present embodiment. In this heat sealing apparatus, a switch SW is provided in one of the circuits connected to a power source (external power source or built-in battery power source) 1 and a control timer mechanism 2 is mounted. This control timer mechanism 2 has a built-in microcomputer (hereinafter sometimes referred to as a microcomputer), and after energization, the sealed portion reaches about 250 ° C. in the maximum time (usually about several to several tens of seconds). So that the time can be controlled.

  A current sensor T for measuring the current supplied to the heater 4 is connected to the heater transformer 3 and a linear heater (hereinafter simply referred to as a heater) 4 connected to the heater transformer 3 to control the current. The timer mechanism 2 measures the current value corresponding to the heater line width used for the heater 4 and automatically changes the timer time by transmitting the measured value to the control timer mechanism 2 so that an appropriate timer time is obtained. The control that can be set is performed. However, the current sensor T may be connected to either the primary side or the secondary side of the heater transformer 3.

  That is, since the heater 4 has different resistance values depending on the line width (thickness is substantially constant), the current value to be energized differs, and the current value at the time of energization is measured by the current sensor T so that the heater 4 is mounted. Can be identified.

  In this case, the heater temperature at the maximum setting time of the control timer mechanism 2 is defined as about 250 ° C., and heaters with different line widths, for example, heating times up to 250 ° C. of 2 mm, 5 mm, and 10 mm are determined in advance. . At that time, the current value measured for the heaters having different line widths by the current sensor T is converted into a voltage, and this voltage value is converted into a digital value by the A / D conversion function of the microcomputer. Store it in the microcomputer.

  At the time of actual energization, the measured value by the current sensor T is converted into voltage and A / D converted (possible within the first several tens of milliseconds) and digitized, and this value and the value stored in the microcomputer in advance are By comparing, the type of the installed heater is determined. Then, the timer time of the control timer mechanism 2 is selected according to the type of the heater, and the result is instructed to the driver 5 for opening and closing the transformer, whereby the energization time to the heater 4 is determined.

  By doing in this way, even if the line widths of the heaters are different, an appropriate energization time can always be secured, so that a stable sealing process can be performed. Therefore, it is not necessary to prepare a plurality of heat sealers having different line widths according to the type of objects to be sealed.

[Another embodiment]
(1) The type of the heat sealer is not particularly limited, and a desktop heat seal device other than the heat seal device as shown in FIG. 2, a deaeration heat seal device, a foot pedal heat seal device, etc. It may be.
(2) In the above embodiment, an example in which the line width of the heater is set to 2, 5, and 10 mm is given, but the line width of the heater is not limited to this, and heaters with other line widths are used. It goes without saying that it is also good.

1 is a schematic circuit diagram of a heat sealing apparatus according to an embodiment of the present invention. Front sectional view showing an example of a conventional impulse heat seal device

Explanation of symbols

2 Control timer mechanism 4 Heater 5 Driver T for opening / closing transformer

Claims (4)

In a heat sealing device that sandwiches a sealed part of resin material and activates and seals the sealed part with a built-in heater by operating a control timer mechanism for a predetermined time, a sensor for detecting the type of the heater is provided. And the control timer mechanism determines and instructs the energization time to the heater based on the detection result of the sensor. 2. The sensor according to claim 1, wherein the sensor is a current sensor connected to either a primary side or a secondary side of the heater transformer, and a detection result of the current sensor is transmitted to the control timer mechanism. Heat seal device. The control timer mechanism preliminarily measures and obtains the heating time until the proper sealing temperature of the heaters having different line widths is reached, and measures the current value to the heater during energization measured by the sensor in advance. 3. The type of heater that is stored is determined by comparing the value measured by the sensor with the value stored in the control timer mechanism in advance during actual energization. Heat seal device. 4. The heat sealing apparatus according to claim 3, wherein a time for energizing the heater is determined by selecting a timer time according to the type of the heater determined by the control timer mechanism and instructing the result to a transformer opening / closing driver.

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