WO2009141925A1

WO2009141925A1 - Ceramics-covered heater for impulse sealer

Info

Publication number: WO2009141925A1
Application number: PCT/JP2008/067865
Authority: WO
Inventors: 坂本　篤信; 坂本　和子
Original assignee: Sakamoto Atsunobu; Sakamoto Kazuko
Priority date: 2008-05-18
Filing date: 2008-10-01
Publication date: 2009-11-26
Also published as: WO2009142076A1

Abstract

An impulse heat sealer has a short heater wire and a large width so that it requires a heavy transformer. If the band-shaped heater wire is slit thinly in its two sides and made thin and long in a zigzag shape, the transformer can be eliminated. In order that the impulse heat sealer may also be used without danger in countries of 200 - 400 V, however, the impulse heat sealer has to be so constituted that the hand need not touch the naked heater wire semipermanently, and that the generated heat appears and disappears quickly on and from the surface. This constitution is satisfied by laying a thin plate of a highly heat-conductive but electrically inconductive material such as aluminum nitride of 0.6 mm over the heating unit of the zigzag heater wire of the metal resistor thin plate, and by covering the whole periphery of the thin plate other than the upper face with a thermal and electrical insulator such as glass cloth. These components are bonded by an adhesive or the like and fixed on a radiation bed.

Description

Impulse sealer ceramic covered heater

に関する Impulse heat sealer, especially heater.

For the impulse heat sealer, for example, when the heater wire has a standard length of 20 cm and a width of 2 mm, a large current of a low voltage such as 20V10A is required, and a heavy transformer is essential when used with a commercial power supply of 100V. However, the present inventors put a thin slit from both sides in the conventional belt-shaped heater wire, zigzag with a uniform narrow width, and electrically thin and long, so in the previous example, a high voltage low current such as 100V2A can be passed. As soon as it became better, it became possible to connect directly to a commercial power supply. This eliminates the need for a heavy transformer and makes a light, energy-saving impulse heat sealer.

∙ When current flows through the heater wire, there is a risk of electric shock. To prevent this, a safety device was attached so that no current would flow through the heater wire when the press mechanism was open. However, if the zigzag of the heater wire is extended or the end of the disconnected heater wire pops out, even if the press mechanism is closed, a part of the heater wire will come out of its mouth, so in that state you can press the switch to energize Then there was a risk of touching it and getting an electric shock.

The inventor considered as a countermeasure was to stick a polyimide resin film that can withstand 600 ° C. on the heater wire. As a result, the zigzag line does not extend and the disconnected end does not pop out, which is improved. However, since the full-width bag is not always sandwiched during a long usage time, the film gets burned when the number of heater wires near the ends, where the press becomes weak and the part of the heater wire that tends to float slightly becomes hot. Carbonization sometimes weakened the film.

One simple solution is to increase the thickness of the film, but even the thinnest 60-micron film can be used to reduce the generated heat, so it can become thicker. In other words, the utility as a sealer was lost. Moreover, the phenomenon of carbonization due to partial overheating is not improved.
Japanese Patent No. 3934934

Since it was known from experience that only a low voltage current flows through the heater wire of a conventional impulse sealer and heat is not transmitted in a short time no matter what is placed on the heater wire, polyethylene or the like melts and adheres. It was only put the fluororesin tape that prevents it from falling. However, a heat sealer that uses a zigzag wire that does not require a transformer can be used without danger in not only countries with commercial power supply voltage of 100V but also in countries with 200 to 240V. In addition, I wanted a cover where the generated heat quickly appeared on the surface.

On the heat generating part of the heater wire, for example, 0.6 mm aluminum nitride, a ceramic thin plate that conducts heat well but is electrically insulating (hereinafter referred to as heat conducting / electrical insulator) was superimposed. Further, the periphery other than the upper surface was surrounded by a heat and electrical insulator such as glass cloth (hereinafter referred to as a thermoelectric insulator), and these were adhered and adhered to each other with an adhesive or an adhesive, and fixed on a heat radiation table.

The heater wire was completely covered and the life of the cover was semipermanently extended, so there was almost no risk of electric shock. Moreover, the heat generated from the heater wire quickly appeared on the surface through the thin plate of the heat conducting / electrical insulator, and quickly cooled down when the current was turned off and the heating was stopped.

FIG. 1 is a sectional view of an example of a heater of the present invention and a press mechanism. FIG. 2 is a plan view of the heater. FIG. 3 is a plan view of the heater wire. FIG. 4 is a cross-sectional view of an application example of a rib and a heater. FIG. 5 is a temperature graph during heating of the heater wire and aluminum nitride. FIG. 6 is a sectional view of an application example of a thermoelectric insulator. FIG. 7 is a cross-sectional view of an example of a heater auxiliary tool. FIG. 8 is a partially enlarged plan view showing another example of the zigzag heater wire. FIG. 9 is a partially enlarged plan view showing another example of the heater wire of the present invention. FIG. 10 is also a partially enlarged plan view showing another example of the heater wire.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Press mechanism 2 Radiating stand 3 Rib 4 Circon tape 5 Heater wire 6 Aluminum nitride thin plate 7 Glass cloth tape 8 Fluorine resin tape 9 Heater wire heat generating part 10 Non-heat-generating part and electrode 11 Silicone rubber 12 Stand 13 Polyethylene bag 14 Heater wire slit 15 Opening 16 with rib edge 16 Integrated thermoelectric insulator 17 Low diagonal thermoelectric insulator 18 Mountain heater aid

Example 1 explains a heater structure in which the entire periphery of the heater wire, which is the object of the present invention, is electrically insulated with reference to FIGS. 1 to 6, and Example 2 describes an application example thereof in FIG.

FIG. 1 is a sectional view of an example of the heater of the present invention and a press mechanism in which it is set. Between the ribs 3 having a height of 1.7 mm provided at the edges on both sides of the upper surface of the heat radiating table 2 made of square-pipe-shaped aluminum extrusion material fixed to the opening 1 (part of the figure) of the press mechanism Sircon tape 4 with a thickness of 0.45mm as a heat and electrical insulator between the heat sink and the heat sink (glass cloth in silicon rubber mixed with aluminum nitride or alumina powder, manufactured by Fuji Polymer Industries) A zigzag iron chrome heater wire 5 having a thickness of 0.1 mm and a width of 2 mm was stacked thereon, and a thin aluminum nitride plate 6 having a thickness of 0.6 mm and a width of 2 mm was placed thereon. A glass cloth tape 7 having a thickness of 0.6 mm and a width of 0.8 mm is placed between both sides of the rib 3 and adjacent to the aluminum nitride 6. Then, the boundary between them and the aluminum nitride thin plate 6 including the heater wires was bonded with an adhesive. Finally, a 0.1 mm thick fluororesin tape 8 with an adhesive was pasted on the aluminum nitride thin plate 6.

The plan view will be described with reference to FIGS. FIG. 2 is a plan view of the heater of FIG. 1 and shows a state before sticking the fluororesin tape 8 with adhesive for easy understanding. FIG. 3 is a plan view of the heater wire. The aluminum nitride thin plate 6 is an elongated quadrangle having the same size and shape as the zigzag thinned portion 9 of the heater wire 5 that generates heat, and between the ribs 3 of the heat sink on both sides in the longitudinal direction of the aluminum nitride thin plate 6. A glass cloth tape 7 is placed as a thermoelectric insulator having a width of 0.8 mm. Further, the portion of the heater wire 5 that does not generate heat and the electrode 10 are connected to the electrode of the power circuit, although not shown in the figure, and if exposed, there is a risk of electric shock. And their boundaries were glued together with an adhesive. All the parts that could be touched by the touch from these were covered with ceramic, glass cloth, or cercon tape, and hardened with adhesive or adhesive. Since the fluororesin tape 8 is stuck on these, the prevention of electric shock is further strengthened.

Describing the operation and function, a base 12 having a soft silicon rubber 11 affixed to a thickness of 2 mm and a width of 3.4 mm was fixed to the other opening 1 of the press mechanism as in the past. A bag 13 made of a polyethylene film having a thickness of about 0.05 mm is inserted into the opening, pressed between the two, and the energization time is 0.8 seconds when the aluminum nitride thin plate 6 is not present. Longer time it was neatly sealed. There is not much difference in cooling time.

Since the heat generated from the heater wire 5 is quickly transferred to the aluminum nitride thin plate 6, even when the aluminum nitride thin plate 6 reaches a temperature at which sealing is possible, the temperature of the heater wire 5 is only several degrees higher than that. The aluminum nitride thin plate 6 has a sealing temperature of 100 to 130 ° C., and when the polyethylene bag 14 is smaller than the width of the heater, a portion that floats near the end, that is, a portion that does not use heat, appears. Since the heat there also moves quickly in the central direction, a portion exceeding 150 ° C. does not occur instantaneously. Therefore, some commercially available silicon-based high-temperature adhesives can withstand 250 ° C. under normal use, so that they are sufficiently long-lasting and somewhat flexible so that they can follow the difference in thermal expansion of each member.

The heater wire 5 is not accurate in dimension as shown in the plan view of FIG. 3, but a heat-generating part 9 is formed from the side of a 2 mm long strip by etching a 0.1 mm thick wide area of iron-chrome thin plate. The vertical slits 14 having a width of about 0.15 mm are alternately inserted, and the heater wire itself has a zigzag shape with a uniform width of about 0.4 mm. If the electrodes 10 at both ends are stretched by thermal expansion or about half the length of the electrodes 10 and fixed to the electrodes (not shown) provided on the heat radiating stand 2, the expansion and contraction of the heater wire 5 can be ignored. . This is difficult if the zigzag heater wire is thick and short, but if it is thin and long as described above, it is easy to bend in the length direction. 4 and aluminum nitride thin plate 6 can be firmly bonded to prevent movement during heating.

By making the heater wire 5 zigzag, it becomes thinner and longer than the conventional ribbon wire of the same outer dimensions, so in the above example, the electrical resistance, which was 2Ω with the ribbon wire, becomes 25Ω. As a result, if a commercial power supply of 100V is passed as it is, it will be cut off instantaneously at 2Ω, but if it is 25Ω, a half-wave rectification will give just a good current, so there is no need to use a transformer. In this way, the slits in the heater wire can be adjusted to the target voltage, and even if the zigzag wire is somewhat non-uniform and narrow, the aluminum nitride thin plate 4 is uneven in heat within a certain range. Can be immediately averaged to provide a clean seal. Therefore, the heater of the present invention can be adapted to any purpose, and can be produced not only in a straight line but also in a shape such as a quadrangle and a circle. It can be used.

The aluminum nitride thin plate 6 has the same shape and the same area as the heating portion 9 of the heater wire. However, if the area is larger than the heat source, the temperature will decrease, and if the surface is made narrower than the surface that receives heat with a trapezoidal cross section, the temperature will increase. As will be described later, a mountain-shaped heater auxiliary tool can also be made integrally, so that an aluminum nitride thin plate with some unevenness can be made. However, it is included in the scope of the claims as long as it has one surface in close contact with the heater wire and performs the same function as the present invention. Further, since the thickness is very good for heat conduction, it is not necessary to make it particularly thin, and about 0.6 mm is sufficient even when considering the robustness.

If there is a joint or crack in aluminum nitride, even if it is about 0.1 to 0.2 mm, as in the patent specification of the zigzag heater wire of the present inventors, a fluororesin tape or bag attached It does not affect the seal due to its own heat diffusion. Therefore, it is only necessary to add a short material, so that even a long heater can be manufactured. In that case, since the required shape of the aluminum nitride thin plate is thin and long, it always breaks further during use. However, even if it breaks, it is only necessary that the broken piece does not fly and the hole is opened, and the heater wire 5 and the glass cloth tape 7 on both sides are adhered with an adhesive. In addition, there is a method in which a fragile line is previously placed with a laser or the like. As a result, even if an unexpectedly strong force is applied, it can be prevented from breaking along the line, making it into fine fragments and making sharp angles.

Further, what is provided in order to protect the aluminum nitride and the insulator more actively is an elongated protrusion or rib 3 provided at the edge of the heat sink. It is intended to prevent accidents in which the hard contents of the bag inadvertently reach the mouth of the bag to be sealed and the heater is damaged when the press mechanism is closed. For example, a female handle in a disinfecting bag pops out. The shape in which the rib 3 is provided on the heat radiating stand 2 as shown in FIG. 1 is convenient in handling the heater alone, but as shown in the sectional view of FIG. It can be said that the structure in which the edge 15 of the opening protrudes when the heater is attached to the opening 1 functions similarly. At least one rib on the side into which the bag is inserted functions. Although the height is low, it prevents accidents from the side, but it should be high enough to withstand accidents from above.

Fig. 5 is a graph showing the heat transfer between the heater wire and the aluminum nitride sheet. The temperature is plotted on the vertical axis and the time is plotted on the horizontal axis. The sensor is a thin tape-shaped thermocouple. As shown in the cross-sectional view of FIG. 1, the measurement point A is between the bottom of the heater wire and the insulating circuit tape 4, and the measurement point B is a heat conducting / electrical insulator. The measurement was performed with the surface of a certain aluminum nitride thin plate 6 closed with a soft silicon rubber 11 with the press mechanism closed. According to this graph, it can be said that there is almost no temperature difference between point A and point B at 100 ° C. to 150 ° C. In other words, it can be said that the heat transfer in the aluminum nitride is so fast that the surface of the heater wire 5 and the aluminum nitride thin plate 6 change at the same temperature.

At 250 ° C to 300 ° C, when the point A graph reaches its peak, the current is cut off and the heating is stopped. It can be seen in the point graph. This is because these sensors are in contact with an insulating cercon tape (thermal conductivity 0.9 W / m · K) where point A has high thermal conductivity at the bottom, that is, heat escapes, and point B has thermal conductivity. It can be said that this phenomenon occurs due to the difference in contact with the ordinary silicon rubber 11 (thermal conductivity 0.16 W / m · K) which is low, that is, an insulator that does not escape heat. And it shows that the heater wire with low thermal conductivity called iron chrome is dividing the heat.

Other than the aluminum nitride thin plate 6, the heat conducting / electrical insulator that functions in the same manner includes silicon carbide, beryllium oxide, cBN, etc., and diamond may be used if the cost is commensurate. A compound may be used. These can be used in exactly the same manner as the aluminum nitride thin plate described so far in ceramics. In terms of thermal conductivity, aluminum nitride is 150 to 250 W / m · K, but the minimum is alumina ceramics with the same conductivity as 24 W / m · K, such as iron chrome and nichrome, etc. In the claims. Compared to aluminum nitride, this alumina has a weaker seal even with the same calorific value, and it can be used for some reason, although the degree of thermal shock is small. However, alumina and below cannot absorb all the heat generated from the nichrome wire, and the heater wire tends to become abnormally hot.

Thermal conductivity is also important in the case of a thermoelectric insulator that surrounds a thermal conducting / electrical insulator. Impulse sealers require rapid heat release and heat transfer to the aluminum pedestal when cooling begins. However, it cannot be used if its thermal conductivity is too high. Steatite, a typical porcelain, has a thermal conductivity of 2.5 W / m · K, but when used as a thin 0.6 mm plate, it is heated through a normal strength current to escape to the heat sink at the bottom. However, sufficient heat does not come out to the surface through aluminum nitride. With a 0.9 W / m · K cercon tape, heat was generated and sealing was possible. The vicinity of this value may be slightly different depending on the amount of power applied, but it is the upper limit of usable insulators.

Conversely, the one with lower thermal conductivity will not be unusable. Even a low glass cloth (0.23 W / m · K) or silicon rubber can be used because heat is released to the atmosphere and drops from the sealing temperature to a temperature that does not shrink within a few seconds. However, when used continuously, the heater gradually becomes hot due to accumulated heat. Therefore, in this case, it is more necessary to control the current as the temperature increases. Therefore, when designing a heat sealer, it is necessary to choose between using an insulator with high thermal conductivity while letting the heat naturally escape to the heat sink or using it with advanced control using a low insulator. Become.

Even if the insulator on the surface and the insulator used at the bottom are separated, it is not so important in terms of releasing heat, so the cross section of the insulator 16 made of the same material as shown in FIG. It can also be united so that it becomes a character. For example, it can be made with silicon rubber cercon tape or cordierite (a kind of porcelain) with bubbles. Accordingly, in the claims, there is no time difference in processing between the insulator pasted on the bottom and the insulator surrounding up to the other surface, and includes simultaneous or integral cases. Conversely, a plurality of insulators may be stacked. In addition, since there is a method in which a silicon-based insulator is filled in a gap and hardened, it can be said that the insulator itself also serves as an adhesive.

The glass cloth tape 7 that covers the electrode 10 and the portion of the heater wire that does not generate heat in FIG. 2 is fine, but the portions that are in contact with the sides of the both ends of the aluminum nitride thin plate 6 are heat insulation, and against the electric shock of the electrode portion, In other words, it is functionally different from electrical insulation. However, because it is a glass cloth, it serves both. Steatite is electrically good, but as described above, its conductivity is too good to be used adjacent to the aluminum nitride thin plate 6. .

The main purpose of electrical insulation is to prevent electricity from flowing, but there are laws and standards in each country such as pressure resistance, flame retardancy, and strength, which must be met. Glass tape and silicon rubber meet double insulation standards if they have a thickness of 0.6 mm, and 0.6 mm aluminum nitride thin plates and 0.45 mm cercon tapes should meet the standards as heat dissipation materials for electronic components. However, it must be applied to the standards of the country concerned. Therefore, in the claims, the expression thickness that the insulator is of a suitable width includes the meaning of meeting this electrical standard in addition to heat.

The height of the surface thermoelectric insulator 7 is also important. As with the conventional sealer, if the plane is the same plane as the upper surface of the glass cloth 7 in FIG. 1 or the integrated insulator 16 in FIG. Since it can be pressed with the silicon rubber 11 of the press mechanism 1 while sandwiching a bag or film, it is finished with less wrinkles, looks beautiful, and increases the commercial value. On the other hand, if the height is low, it cannot be pinched, so wrinkles are caused at the boundary with the seal, and if the heating time is long, the edge may be cut. However, since the seal strength is not greatly affected by normal heating, the insulator 17 is low or oblique as shown in FIG. However, although not shown in the drawing, the shape in which the reverse insulator 7 is traveling higher than the aluminum nitride 6 cannot be sealed and cannot be used.

¡Unprecedented sealing can be achieved by placing a heater auxiliary tool on the aluminum nitride thin plate 6 under the fluororesin tape to meet the purpose of the seal. For example, as shown in the cross-sectional view of FIG. 7, aluminum nitride or aluminum is used as a material, and the cross section is mountain-shaped, the height is 0.3 mm, the bottom width is 0.6 mm, and the length is the same as that of the heater. It is. Thus, sealing and heat cutting can be performed. Although not shown in the figure, the date can be sealed with a numerical aid, which can be called an impulse hot stamp, and there are various applications other than the date.

A heater auxiliary tool with good heat conductivity is suitable. Therefore, a heat conducting / electrical insulator such as aluminum nitride can be used, and since aluminum is electrically insulated with aluminum nitride or the like, aluminum or copper can also be used. However, since the expansion coefficient is different between ceramics and metal, caution is required for long ones. Moreover, if the same thing is mounted on aluminum nitride etc., you may manufacture as a lump from the beginning.

The material of the heat sink is preferably aluminum, copper, or their alloys, but if the heater is covered with an insulator with low heat conduction, the heat dissipation effect will be diminished, so the function is just a stand or a reinforcing plate, in which case heat conduction Although it is not good, even strong iron can be used. However, since it is certain that heat is transmitted, it is called a heat sink including these. The heater of the present invention is surrounded by the heat radiation stand in the best condition in terms of strength and handling. However, as shown in the sectional views of the heaters in FIGS. If the conductive / electrical insulator 6 and the heater wire 5 are hardened with an adhesive, only those main elements can be handled as replacement parts, so they are included in the scope of claims.

Since the conventional heater wire expands and contracts, if a fluororesin tape is attached with an adhesive, fine wrinkles will come to the tape during use. For this reason, a wide tape without an adhesive was used, and both edges were fixed by mechanically pressing. However, since the heater of the present invention hardly expands or contracts, it is only necessary to simply apply a fluororesin tape with an adhesive. The term “fluororesin tape” includes a tape using a glass cloth as a base material. Further, since the heater of the present invention does not become abnormally high temperature and the life of the fluororesin tape is very long, it can be applied thinly, for example, on the surface of a heat conducting / electrical insulator. If it is applied thinly, silicon rubber can be used as a release agent.

Fluororesin or silicone rubber as a mold release agent has a very low thermal conductivity, that is, it is difficult to transfer heat. Since it is transmitted as thin as about 0.1 mm, the thinner the release agent layer, the better. Laminate films with nylon, paper, non-woven fabric, etc. on the surface melt and do not stick to the heater, so they are not necessary when used for such seals. Therefore, the case where it is used without a release agent is also included in the claims.

The heater wire suitable for the present invention is not limited to the zigzag line of FIG. As long as the slit crosses the length direction of the heater wire, the movement in the length direction is absorbed to some extent, so that the effect is the same even if it is not only vertical but also oblique or an arc as shown in FIG. 9 and 10 can also be used, but if the center line is cut, two zigzag lines in FIG. 3 can be formed, which can be considered as a combined deformation. However, the heater wire in FIG. 10 requires time and heat generation until the slit is too large and the gap is filled with heat, and the wire width is not uniform, so extra heat is generated in the thin part. . In other words, the heater wire is forced. Therefore, in order to heat smoothly, the slit should be as small as possible and the line width should be uniform.

If the heater wire is a zigzag wire that is easy to bend as shown in FIG. 3, expansion and contraction can be suppressed by an adhesive, so that an extremely thin heater wire can be manufactured. Etching may be performed after an ultra-thin plate of 0.09 to 0.01 mm is first attached to a heat conducting / electrical insulator or thermoelectric insulator such as ceramics or glass cloth tape. This is because if it is thin, the electric resistance is increased and the possibility of being directly connected to a higher external power source is increased. In this case, the zigzag wire by the metal plate itself can flow a certain large current, unlike the heater wire in which oxide etc. is baked on the ceramic thin plate of the heat conducting / electrical insulator even if it is thin. Even if it breaks, it doesn't break immediately. In this manufacturing method, the processing order is reversed from the scope of the claims because they are overlapped and pasted into a zigzag. Accordingly, there is no temporal order in the claims.

The advantage of covering the heater wire with a heat conducting / electrical insulator can be applied not only to zigzag wires but also to general ribbon wires. Since ceramics such as aluminum nitride have a small expansion coefficient, a heater wire made of a metal having a small expansion coefficient, such as Invar of a nickel iron alloy, is suitable. In the case of a long sealer of 2m or 3m, the voltage applied to the heater wire is 200V or 300V, so it is safe to insulate it, or the 3m heater is composed of three 1m heater wires and the joint is not understood. , Can be used while switching at 100V. The heater wire can also be protected in the case of sealing with water or corrosive liquids.

Even in the case of a heater wire having a large expansion coefficient, it is easy if it is short. For example, it can be applied to a sealer of about 2 cm such as a tube sealer, and in the case of a thin tube, it is possible to prevent scorching of the fluororesin tapes at both ends, which are easily removed from the tube and overheated. In the case of a long sealer, it is convenient that the thermal conductivity / electrical insulator also has a large expansion coefficient. For example, like a file, a thin layer of diamond is formed on the surface of an iron alloy heater wire and used as a heat conducting or electrical insulator, or conversely an alumina layer on the surface of a strip-shaped aluminum plate as an auxiliary tool, For example, forming thick aluminum nitride. Thermoelectric insulators are often more highly expanded.

The metal resistance plate as the heater wire can be anything such as tungsten, which is usually used as a heater wire, in addition to iron alloys such as iron chrome and nichrome. Moreover, since the sealer of the present invention is light and easy to hold and use, there may be a sealer having no silicon rubber side only on the heater side. As a press mechanism, a press mechanism including a human body, that is, a human body, is also included in the present invention.

¡The insulation is complete because the heater wires and electrodes are completely covered with heat-resistant, strong and hard-to-break aluminum nitride or glass cloth. As a result, safe transformer-less impulse sealers can be produced even in countries with high commercial voltages such as 200-240V, eliminating the need for heavy transformers that consume large amounts of iron and copper.

Since the heater wire and aluminum nitride thin plate hardly expand or contract, it is only necessary to attach the fluororesin tape or coated tape with adhesive, so the heater wire stretching device and the fluororesin tape fixing device, which were essential for conventional models Became unnecessary and the structure became very simple.

Furthermore, since heat is transferred quickly in the heat conducting and electrical insulators, abnormally high temperature spots do not occur, so both the heater wire and fluororesin tape will last longer, making maintenance inspections unnecessary for a long time.

When sealing a bag of water or acidic liquid like pickles or in an acidic atmosphere in the workplace, the conventional exposed heater wire has a drawback of corroding, but the heater of the present invention is almost sealed. So durability increased.

Since the device is light, maintenance is not required, and durability is increased, there is a possibility that applications other than packaging such as sealing with polyethylene for treatment of filth and odor prevention for nursing care may increase further.

Claims

It consists of at least a press mechanism, a heater provided in the opening thereof, and a power circuit connected to the heater. The power circuit receives power from an external power source, and sandwiches an object using a thermoplastic resin in the press mechanism. In an impulse heat sealer that applies a large current in a short period of time while applying pressure at a short time to instantaneously heat the heater to melt the object, and then cools and solidifies immediately while applying pressure, the heater includes A. A thin plate of thermoelectric insulator of appropriate size and thickness is stacked on the metal heat sink provided in the opening of the press mechanism or on the opening serving as the heat sink.
B. On the thermoelectric insulator, one or more heater wires of a metal resistor thin plate connected to the power supply circuit with electrodes and having a heat generating portion formed into an elongated strip or a target shape are overlaid,
C. On top of the heat generating part, a thin plate of heat conducting / electrical insulator of appropriate thickness is stacked,
D. In order to prevent the side surface of the heat-generating part from being exposed, the entire circumference of the heat conducting / electrical insulator has a suitable width in a plan view, and the bottom is a thermoelectric already from the surface of the heat sink or to the heat sink. If there is an insulator, either from the surface of the insulator or integrally with it, the top is the surface of the heat conducting / electrical insulator or the height below it, surrounded by the thermoelectric insulator,
E. Adhering and fixing those necessary parts using an adhesive or adhesive,
F. In order to provide a thin release layer on the surface of the heat conducting / electrical insulator at all times or when necessary, a release material is applied to the surface in advance, or a thin film tape of a release material with an adhesive is applied,
Impulse heat sealer characterized by structure.
2. The impulse heat sealer according to claim 1, wherein the heater wire of the metal resistor thin plate has a structure in which a slit across the length direction is provided in the heat generating portion to suppress expansion and contraction in the length direction.
In order to prevent the side surface of the heat generating part from being exposed, the height and shape of the thermoelectric insulator that surrounds the entire circumference of the heat conducting / electrical insulator with an appropriate width in plan view is the same as that of the heat conducting / electrical insulator. The impulse heat sealer according to claim 1 or 2, wherein the impulse heat sealer is a plane having the same height or a parallel plane lower by about 0.1 to 0.2 mm.
The heater according to claim 1 or claim 1, wherein the heater wire is fixed to the heat radiating stand or is fixed by covering the heater wire with a heat conducting / electrical insulator and a thermoelectric insulator, and adhering and fixing with an adhesive or an adhesive. 2 impulse heat sealer heater or main element
The impulse heat sealer according to claim 1 or 2, wherein the heat conducting / electrical insulator is aluminum nitride, silicon carbide, or ceramics containing them as a main component.