JP5405942B2 - Heat sealer - Google Patents

Description

  The present invention is an impulse heat sealer that sandwiches and presses an object to be sealed between a first pressing part and a second pressing part, and seals the sealing part of the object to be sealed by heating with an impulse heater, The present invention relates to an impulse heat sealer that seals a thick object to be sealed.

  Such an impulse heat sealer is disclosed, for example, in Patent Document 1 below. The object to be sealed is sandwiched and pressed between the first pressing part and the second pressing part, and the impulse heater is instantaneously heated to melt and seal the sealing part of the object to be sealed. Here, the material of the object to be sealed is a resin film having a thickness of about 0.2 mm, and the sealing portion can be melted by instantaneously heating with a heater.

Japanese Patent No. 3547696

  In the impulse heat sealer, the object to be sealed is a thin resin film, but there is a demand for sealing an object to be sealed having a thickness. For example, when a thing with a thickness of about 1 mm is to be sealed with the above heat sealer, it is necessary to transfer heat to the inside of the object to be sealed in the thickness direction, and thus it is necessary to lengthen the heating time. The state at this time is shown in FIG. FIG. 7 shows an object to be sealed.

  As shown in FIG. 7, a seal portion B is set on the top of the object to be sealed A. For example, the object to be sealed A is formed in a bag shape, and seals a seal portion B for closing an opening provided in the upper portion thereof. An appropriate object is accommodated in the sealed object A.

  FIG. 8A shows a state where the seal part B is sandwiched between the first pressing part 100 and the second pressing part 101. Each pressing part 100, 101 is provided with linear heaters 100a, 101a. By energizing this, the linear heaters 100a and 101a generate heat, and the seal portion B is melted by heating. The sealed object A is made of, for example, resin, and can be melted and sealed by heating.

  However, due to the thickness, the heating time becomes longer than that of the resin film, and after the sealing is completed as shown in FIG. 8B, the pressed mark may remain as a dent. In addition to the formation of such a recess, as shown in FIG. 9, a protruding portion C may be formed at both ends of the seal portion B. Therefore, there is a problem that the appearance of the seal portion B is not good. Furthermore, there is also a problem that when the dent is formed, the rupture tends to break due to stress concentration.

  The present invention has been made in view of the above circumstances, and the problem is that even when sealing an object to be sealed having a thickness, it is possible to provide a seal that is less likely to cause a dent in the seal portion and improve appearance and is less likely to break. It is to provide an impulse heat sealer.

In order to solve the above problems, the impulse heat sealer according to the present invention is:
An impulse heat sealer that sandwiches and presses an object to be sealed between a first pressing part and a second pressing part and seals the sealing part of the object to be sealed by heating with an impulse heater,
A placement surface provided on the first pressing portion for placing an object to be sealed;
A linear heater provided on at least one side of the first pressing portion and the second pressing portion for heating the seal portion;
A pressing amount limiting body disposed at both ends of the linear heater,
The height of the pressing amount restricting body is set to be lower than the thickness of the object to be sealed before sealing. The pressing operation of the object to be sealed is started by the second pressing portion, and the object to be sealed is compressed. After that, the second pressing portion is configured to limit the pressing amount of the sealed object by contacting the pressing amount limiting body ,
The pressing amount limiting member is characterized in Rukoto detachably mounted to accommodate the length of the seal portion of the seal material, to the mounting surface.

  The operation and effect of the impulse heat sealer having such a configuration will be described. This heat sealer is an impulse type, and only when performing a sealing operation, the heater is instantaneously heated to seal the seal portion. The object to be sealed is sandwiched and pressed between the first pressing portion and the second pressing portion, and in this state, the heater is energized to melt the sealing portion and perform sealing. The first pressing portion includes a mounting surface on which the object to be sealed is mounted, and the object to be sealed is formed by the first pressing portion and the second pressing portion in a state where the object to be sealed is mounted on the mounting surface. The seal part is sandwiched and pressed. Immediately after the start of pressing, the thickness of the object to be sealed is greater than the height of the pressing amount restricting body. Therefore, the pressing surface of the second pressing portion first contacts and presses the sealing portion of the object to be sealed.

  When the heater is energized, the sealed object is gradually compressed in combination with the pressing force by the second pressing portion. When the thickness of the object to be sealed reaches the same height as the pressing amount restricting body, the second pressing portion cannot press further. Therefore, the seal portion is not pressed more than necessary. The sealing of the sealing portion is completed by heating the sealing portion for a predetermined time by energizing the heater. As described above, since the pressing force by the second pressing portion is limited, it is possible to make the seal portion less likely to be dented and to have a good-looking seal. Moreover, since a dent is hard to produce, the seal | sticker which is hard to produce the fracture | rupture resulting from stress concentration can also be enabled.

In the present invention, the pressing amount limiting member is Ru removably attached. There are various types of objects to be sealed depending on the material, purpose, function, etc., and the thickness is also various. Therefore, to accommodate different thickness, and a detachable pressing amount limiting member. Thereby, heat sealing of various to-be-sealed objects can be performed.

Side view of heat sealer Top view of heat sealer Sectional drawing which shows the structure of a press part Front view showing the configuration of the pressing part Front view explaining the operation of the heat sealer Sectional drawing explaining operation of heat sealer The figure which shows the external appearance structural example of a to-be-sealed thing Sectional drawing which shows the aspect of the thick seal concerning a prior art Plan view showing aspects of a thick seal according to the prior art

  A preferred embodiment of an impulse heat sealer according to the present invention will be described with reference to the drawings. FIG. 1 is a side view of the heat sealer, and FIG. 2 is a plan view of the heat sealer. This heat sealer has a structure suitable for sealing a relatively thick object to be sealed. The thickness is, for example, about 1 mm. Specific examples of the object to be sealed include a vinyl chloride tube, a polyethylene bag, a polypropylene bag, and the like.

<Configuration of heat sealer>
This heat sealer is provided with a heat sealer main body 1 composed of a lower frame 2 and an upper frame 3, and a cradle 10 (corresponding to a first pressing portion) for receiving a seal portion of an object to be sealed is supported by the lower frame 2 and sealed. A pressure-bonding lever 4 (corresponding to a second pressing portion) that is clamped by the receiving base 10 is supported on the upper frame 3 through a pair of left and right arms 5 so as to be swingable around the left and right horizontal axis 5a. A table 6 on which a sealing object is placed is provided.

  The crimp lever 4 is urged upward by a return spring 8, and a solenoid (not shown) that drives the crimp lever 4 to swing downward against the urging force of the return spring 8 is provided in the lower frame 2. Is provided.

<Configuration of pressing part>
3 and 4 are diagrams showing the configuration of the cradle 10 and the pressure-bonding lever 4 that function as a pressing portion. 3 shows a cross-sectional view and FIG. 4 shows a front view. A first pressing surface 10a (mounting surface) is formed on the surface of the cradle 10, and a second pressing surface 4a is formed on the surface of the pressure-bonding lever 4. The objects to be sealed are sandwiched between these pressing surfaces 10a and 4a. Press (crimp). A first linear heater 11 and a second linear heater 12 are provided on the side of the cradle 10 and the pressure-bonding lever 4, respectively, and are formed linearly corresponding to the seal portion B as shown in FIG. Is done. Each of the linear heaters 11 and 12 is covered with a fluororesin cover (protective cover), and its surface functions as the aforementioned pressing surfaces 10a and 4a.

  As shown in FIG. 4, blocks 13 (corresponding to pressing amount limiting bodies) are arranged at both ends of the linear heaters 11 and 12. When the pressure lever 4 is lowered, the block 13 is in contact with the second pressing surface 4a of the pressure lever 4 so that it cannot be pushed down any further. The height of the block 13 is set to be slightly lower than the thickness of the object to be sealed. For example, when the thickness of the object to be sealed is 1 mm, the height of the block 13 is set to 0.7 mm to 0.9 mm, for example, 0.8 mm.

  The height of the block 13 is changed depending on the thickness of the object to be sealed. Therefore, the block 13 is detachably attached to the first pressing surface 10a of the cradle 10. In order to be detachable, the block 13 is mounted on the cradle 10 by an appropriate method such as screwing or fitting. Therefore, a region sandwiched between the pair of left and right blocks 13 is a region R into which a sealed object is inserted. The mounting position of the block 13 can be freely changed so that it can correspond to various lengths of the seal portion of the object to be sealed, that is, the length of the region R shown in FIG. 4 can be freely changed. Yes. For example, if the block 13 is mounted by screwing, female screws may be formed at a plurality of locations.

  The material of the block 13 can be made of an appropriate material such as metal or resin in consideration of strength, durability and the like. Further, the shape and size can be determined as appropriate.

<Operation of heat sealer>
Next, the operation of the impulse heat sealer according to the present embodiment will be described with reference to FIGS. FIG. 5 is a view partially showing a front view for explaining the operation of the heat sealer, and FIG. 6 is a cross-sectional view for explaining the operation of the heat sealer.

  FIG. 5A shows a state before crimping by the crimping lever. It mounts so that the seal | sticker part B of the to-be-sealed object A may be located in the 1st press surface 10a (mounting surface) of the receiving stand 10. FIG. Next, the switch (not shown) is operated to cause the crimping lever 4 to be pushed down. That is, in FIG. 1, the crimping lever 4 is rotated around the left and right horizontal axis 5 a and rotated against the return spring 8. As a result, the object to be sealed begins to be clamped by the second pressing surface 4 a of the crimping lever 4 and the first pressing surface 10 a of the cradle 10. This state is shown in FIGS. 5 (b) and 6 (a). The time point when the object to be sealed starts to be clamped can be detected by a sensor (not shown). Based on the detection signal from the sensor, the first and second linear heaters 11 and 12 are energized. As a result, the first and second linear heaters 11 and 12 are heated, and the object to be sealed starts to be melted by the heat, and the seal portion B is sealed. The sensor can be configured by a microswitch that operates when the pressure-bonding lever 4 has moved to a predetermined position, but may be configured by an appropriate type of sensor such as an optical sensor.

  Further, as the pressure-bonding lever 4 rotates, the sealed object A is further pressed by the second pressing surface 4a. As a result, the thickness of the object A to be sealed is gradually compressed, and the state shown in FIGS. 5C and 6B is obtained. In this state, the second pressing surface 4 a of the crimping lever 4 abuts on the block 13. As a result, the crimping lever 4 cannot move any more. Even if it will be in this state, since the energization to the linear heaters 11 and 12 is performed for a while (predetermined time), the seal part B is heated and melted. And as shown in FIG.6 (c), heat | fever is transmitted to the inside and the seal | sticker of the seal part B can be completed.

  After a predetermined time has elapsed, the crimping lever 4 moves upward. Thereby, the sealing operation | movement of the to-be-sealed object A is completed. It is preferable that the predetermined time can be set in consideration of the material of the object to be sealed.

<Effect>
According to the configuration of the present invention, the block 13 that functions as a pressing amount restricting body is provided, and it is possible to suppress the sealing portion B from being pressed and melted more than necessary. Therefore, it is possible to suppress the appearance of a large dent as shown in FIG. Moreover, since a dent is hard to produce, the seal | sticker which is hard to produce the fracture | rupture by stress concentration can be performed. Furthermore, since the blocks 13 are disposed at both the left and right ends of the seal portion B, it is possible to prevent the protrusion C as shown in FIG. 9 from being formed. Also in this respect, the appearance can be improved.

<Another embodiment>
In the present embodiment, the block 13 is attached to the cradle 10 side. Alternatively, the block 13 may be detachably attached to the second pressing surface 4 a side of the crimping lever 4.

  In the present embodiment, the linear heaters 11 and 12 are provided on both the cradle 10 and the pressure-bonding lever 4, but may be provided on only one of them.

  The energization timing (timing for detecting that the crimping lever 4 has reached a predetermined position) can be set as appropriate. It is possible to set the timing for starting the pressing operation as shown in FIG. 5B or an appropriate timing from FIG. 5B to FIG. 5C.

  The object to be sealed A can be sealed in various forms such as a bag or tube.

DESCRIPTION OF SYMBOLS 1 Heat sealer main body 2 Lower frame 3 Upper frame 4 Crimp lever 4a 2nd press surface 5 Arm 6 Table 8 Return spring 10 Receptacle 10a 1st press surface (mounting surface)
11 1st linear heater 12 2nd linear heater 13 Block (pressing amount restriction body)
A Sealed object B Sealed part R Area

Claims (1)

An impulse heat sealer that sandwiches and presses an object to be sealed between a first pressing part and a second pressing part and seals the sealing part of the object to be sealed by heating with an impulse heater,
A placement surface provided on the first pressing portion for placing an object to be sealed;
A linear heater provided on at least one side of the first pressing portion and the second pressing portion for heating the seal portion;
A pressing amount limiting body disposed at both ends of the linear heater,
The height of the pressing amount restricting body is set to be lower than the thickness of the object to be sealed before sealing. The pressing operation of the object to be sealed is started by the second pressing portion, and the object to be sealed is compressed. After that, the second pressing portion is configured to limit the pressing amount of the sealed object by contacting the pressing amount limiting body ,
The pressing amount limiting member is to accommodate the length of the sealing portion of the sealing material, impulse heat sealer, wherein Rukoto detachably attached to the mounting surface.

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