JP4015069B2 - Linear heater for heat seal device and heat seal device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a linear heater for a heat seal device and a heat seal device, and more specifically, to a linear heater for a heat seal device that linearly heat seals a sealed portion of a packaging body made of a thermoplastic resin such as polystyrene. The present invention relates to a heat sealing apparatus including
[0002]
[Prior art]
This type of heat-sealing device is composed of a pressing portion that can be opened upward around a fulcrum formed at one end portion and a base portion that includes a linear heater. The pressing portion and the base portion When the sealed portion of the resin package is sandwiched between the two, the energized portion is automatically energized and heated, and the sealed portion is fused and sealed. In that case, since the linear heater is made of a metal heating element, when it is heated, it expands thermally and extends in the length direction. When the heating is finished, it is naturally cooled and prepared for sealing the sealed portion of the next package. Thus, a structure is known in which tension is applied to the heater wire in order to absorb the elongation of the heater wire due to thermal expansion during heating.
[0003]
As a known technique of such a heat sealing apparatus, for example, a fixing structure of a heater wire for heat sealing disclosed in JP-A-10-258808 is known. In this fixing structure, a spring member is provided on the side of the seal bar so that the heater wire extends laterally, the spring member is insulated, and the spring bar is used to apply tension to the heater wire in the longitudinal direction. Attached to the top surface of the plate.
[0004]
[Problems to be solved by the invention]
However, since the heat sealing device of the above prior art employs a structure in which a spring member, a conductive terminal plate, and a heater wire are stacked in this order on the back side of the seal bar, and then fixed with screws. There is a problem that work is difficult. That is, when assembling, it is necessary to perform component coupling while applying tension to the heater wire by the spring member. However, since the spring member and the heater wire are configured as completely separate members, the assembly work is simplified. Difficult to do.
[0005]
The present invention has been made in view of the above circumstances, and the problem is that a linear heater for a heat seal device capable of simplifying workability when assembling a linear heater, and a heat using the linear heater. It is to provide a sealing device.
[Means for Solving the Problems]
In order to solve the above problems, a linear heater for a heat seal device according to the present invention is provided.
Possess a linear heater part and a terminal part which is respectively integrally joined substantially L-shaped at both ends of the heater portion, and a linear heater which is attached to the heat-sealing device main body,
The fixed end side of the terminal portion is integrally coupled with the heater portion, and the free end side of the terminal portion is inclined at an obtuse angle with respect to the heater portion, and the heater portion is pressed against the heat seal device main body. is positioned on the side, the when the mounting by screw fastening on the side surface portion perpendicular to the pressing surface of the free end side the heat-sealing device main body, wherein the heater unit is urged in the direction of stretching It is what.
[0006]
The linear heater having this configuration includes a linear heater portion and a substantially L-shaped terminal portion, and the heater portion and the terminal portion are integrally coupled. Further, the substantially L-shaped terminal portion has a fixed end side and a free end side, and the fixed end side is integrally coupled with the heater portion. Further, the free end side of the terminal portion is inclined at an obtuse angle with respect to the heater portion. And a linear heater can be attached with respect to a main body by attaching the free end side of a terminal part to a heat seal apparatus main body, and it is urged | biased in the direction where a heater part extends | stretches in the case of the attachment. That is, the terminal portion is made to function as a spring member. Then, the linear heater in which the terminal portion and the heater portion are integrated is attached to the heat seal apparatus main body. Therefore, the assembly workability is clearly improved as compared with the case where the heater part and the terminal part (spring member) are assembled as separate members. As a result, it is possible to provide a linear heater for a heat seal device that can simplify workability when assembling the linear heater.
[0007]
As a preferred embodiment of the present invention, there is one in which the free end side of the terminal portion is inclined by 95 to 120 ° with respect to the heater portion. Thereby, an appropriate tension can be applied to the heater portion.
[0008]
In another preferred embodiment of the present invention, the terminal portion is made of a highly elastic material. Thereby, a tension | tensile_strength can be reliably provided with respect to a heater part.
[0009]
As still another preferred embodiment of the present invention, one provided with auxiliary elastic means for urging the heater portion in the extending direction can be mentioned. By providing this auxiliary elastic means, it is possible to more reliably apply tension to the heater portion.
[0010]
In order to solve the above problems, a heat sealing apparatus according to the present invention is as follows.
Between the first pressing portion and the second pressing portion, the sealed portion of the sealed object is sandwiched and pressure-bonded so that the sealed portion can be heated and sealed, and the first and second pressing portions are The linear heater according to the present invention for heating and sealing the sealed portion is mounted.
The operations and effects of this configuration are as described above.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Preferred embodiments of a heat seal device according to the present invention and a linear heater used in the heat seal device will be described with reference to the drawings. 1 to 3 show a configuration of a heat seal device, FIG. 1 is a central sectional view, FIG. 2 is a front view, and FIG. 3 is a plan view.
[0012]
The heat seal apparatus 1 shown in the figure is a handy type, and connects a first handle portion 2 and a second handle portion 3 by a fulcrum 4 so as to be relatively rotatable. A first pressing portion 5 is provided at the tip of the first handle portion 2, and a second pressing portion 6 is provided at the tip of the second handle portion 3. The first and second pressing portions 5 and 6 are sandwiched by heat-sealed packaging parts to be sealed, heated and held for a predetermined time, and then fused and sealed. As shown in FIG. 3, the first and second handle portions 2 and 3 and the first and second pressing portions 5 and 6 are arranged orthogonally and are formed in a substantially T shape in plan view.
[0013]
FIG. 4 shows a detailed configuration of the first pressing portion 5 or the second pressing portion 6. In addition, since the 1st press part 5 and the 2nd press part 6 have the same structure, only one of them is demonstrated. The pressing parts 5 and 6 have a rectangular shape along the sealing direction as a whole. First, the seal bar 10 having a shape along the longitudinal direction is provided. The seal bar 10 is made of aluminum in order to improve heat dissipation.
[0014]
A small electrode base 11 is fastened with screws 12 to both ends in the longitudinal direction of the seal bar 10. Further, the electrode 13 is fastened to the small electrode stand 11 with screws. A heater element 15 (corresponding to a linear heater) is attached to one side of the seal bar 10. As shown in FIG. 5, the heater element 15 includes a heater portion 15a and an electrode terminal portion 15b. 5A is a plan view, FIG. 5B is a front view, and FIG. 5C is a side view. The heater portion 15a is formed in an elongated line shape in accordance with the shape of the non-sealing portion. The heater portion 15a is formed of a nichrome alloy wire having a width of about 2 mm and a thickness of about 0.15 mm, but is not limited to this, and the size can be appropriately changed according to the purpose of use. In addition, as the material type of the heater portion 15a, a heating element made of a Kanthal alloy may be used.
[0015]
Electrode terminal portions 15b are respectively attached to and integrated with both ends in the longitudinal direction of the heater portion 15a. As shown in FIG. 5B, the terminal portion 15b is substantially L-shaped when viewed from the front. The terminal portion 15b has a fixed end side and a free end side, and the fixed end side is coupled to the end portion of the heater portion 15a by spot welding or the like. The free end side 15c is bent outward. In the heater element 15, the terminal portion 15b is formed such that the angle θ formed by the free end side 15c and the heater portion 15a becomes an obtuse angle in a state where the heater portion 15a and the terminal portion 15b are coupled. Preferably, the terminal portion 15b is formed so that θ = 95 ° to 120 °. In the embodiment, θ = 105 °. By selecting such a numerical value, an appropriate magnitude of tension can be applied to the heater portion 15a.
[0016]
The terminal portion 15b has a width of about 6 mm and is formed wider than the heater portion 15a. The terminal portion 15b is made of a highly elastic material and has a spring property. Examples of the highly elastic material include a phosphor bronze plate having a thickness of about 0.2 mm, but are not limited thereto.
[0017]
Next, attachment of the heater element 15 will be described with reference to FIG. FIG. 6A shows a state before the heater element 15 is coupled to the small electrode base 11, and FIG. 6B shows a state after the coupling. In (a), the free end side 15c is in a state of being opened outward by an angle θ with respect to the heater portion 15a. Moreover, (b) is the state which fastened the free end side with the screw 14. FIG. By this screw fastening, the heater portion 15a is pulled in the direction of the arrow in the figure. Thereby, the heater part 15a is extended | stretched. The heater portion 15a increases in size when heated. By energizing the heater portion 15a in this manner, the heater portion 15a is constantly applied with tension to absorb the elongation of the heater portion 15a.
[0018]
Further, since the heater element 15 in which the heater portion 15a and the terminal portion 15b functioning as the main elastic means are integrated is attached to the seal bar 10 and the small electrode base 11 (these correspond to the heat seal device main body). Assembling work is easy. The external part of the heater part 15a is protected by a fluororesin sheet (not shown).
[0019]
5 and 6, an auxiliary spring (corresponding to auxiliary elastic means) 16 may be provided. The auxiliary spring 16 is composed of a compression coil spring. When the spring force of the terminal portion 15b itself is insufficient, the heater portion 15a can be reliably extended by providing the auxiliary spring 16.
[0020]
The other structure of the heat seal apparatus 1 is demonstrated easily. As shown in FIG. 1, a micro switch 7 is provided for detecting whether the first pressing portion 5 and the second pressing portion 6 are in a normal state or in a closed state. Further, the wiring from each heater element 15 and the wiring of the micro switch 7 are connected to a control device (not shown). The control device includes a timer device for controlling the heating time of the heater element 15, a micro switch 7 for detecting the start of energization of the heater element 15 by the movement of the first and second handle portions 2 and 3, An electric circuit for heating provided with a display lamp composed of an LED to be lit, a transformer for transforming an external commercial power source, and the like is stored.
[0021]
Next, a procedure for sealing a sealed part of a sealed object (a package made of a thermoplastic resin such as polystyrene) will be described. First, the distance between the pressing surfaces of the first pressing portion 5 and the second pressing portion 6 is set to be separated (see the imaginary line in FIG. 1). Then, the object to be sealed 20 is inserted between the pressing parts 5 and 6, the first handle part 2 and the second handle part 3 are grasped by hand, and the object to be sealed 20 is sandwiched and crimped. By this operation, the microswitch 7 is turned on and the heater element 15 is heated. When heating for a predetermined time is completed, the first pressing portion 5 and the second pressing portion 6 are opened and the sealed object is taken out. The heater element 15 is not automatically turned on by the microswitch 7, but another energization switch may be provided and the heater element 15 may be energized by operating this switch.
[0022]
[Another embodiment]
(1) Although the present embodiment has been described with a hand-held heat seal device, the present invention can also be applied to a stationary heat seal device.
[0023]
(2) The form in which the free end side 15c of the terminal portion 15b is inclined at an obtuse angle is not limited to that in FIG. 5, and for example, as shown in FIG. It may be bent outward.
[Brief description of the drawings]
1 is a central cross-sectional view of a heat sealing device. FIG. 2 is a front view of the heat sealing device shown in FIG. 1. FIG. 3 is a plan view of the heat sealing device shown in FIG. FIG. 5 is a diagram showing the configuration of the heater element. FIG. 6 is a diagram explaining the mounting of the heater element. FIG. 7 is a diagram showing another embodiment of the terminal portion.
DESCRIPTION OF SYMBOLS 1 Heat seal apparatus 5 1st press part 6 2nd press part 10 Seal bar 11 Small electrode stand 15 Heater element 15a Heater part 15b Electrode terminal part 15c Free end side 16 Auxiliary spring

Claims (5)

Possess a linear heater part and a terminal part which is respectively integrally joined substantially L-shaped at both ends of the heater portion, and a linear heater which is attached to the heat-sealing device main body,
The fixed end side of the terminal portion is integrally coupled with the heater portion, and the free end side of the terminal portion is inclined at an obtuse angle with respect to the heater portion, and the heater portion is pressed against the heat seal device main body. is positioned on the side, the when the mounting by screw fastening on the side surface portion perpendicular to the pressing surface of the free end side the heat-sealing device main body, wherein the heater unit is urged in the direction of stretching A linear heater for a heat seal device.   The linear heater for a heat seal device according to claim 1, wherein a free end side of the terminal portion is inclined by 95 to 120 ° with respect to the heater portion.   The linear heater for a heat seal device according to claim 1 or 2, wherein the terminal portion is made of a highly elastic material.   The linear heater for a heat seal device according to any one of claims 1 to 3, wherein auxiliary elastic means for urging the heater portion in the extending direction is provided. .   Between the first pressing portion and the second pressing portion, the sealed portion of the sealed object is sandwiched and pressure-bonded so that the sealed portion can be heated and sealed, and the first and second pressing portions are A heat seal device equipped with the linear heater according to any one of claims 1 to 4, which heats and seals the sealed portion.

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