KR102250660B1 - High frequency induction heating welding machine and welding method using same - Google Patents

Abstract

The present invention relates to a high-frequency induction heating welding machine, and a welding method using the same. In a mask manufacturing process, pattern welding on a plurality of nonwoven film layers can be made by a high-frequency induction heating method capable of performing a large-capacity output, thereby showing the effect of improving temperature precision and enabling high-speed welding. To achieve the purpose, the high-frequency induction heating welding machine of the present invention comprises: a plurality of guide rolls (11, 12, 13) through which a plurality of nonwoven films to be welded (f1, f2, f3) are guided; a pattern roll (10) for forming a pattern on the guided nonwoven films (f1, f2, f3); a press roll (20) configured on the pattern roll (10); and an induction heating plate (30) configured under the pattern roll (10). The induction heating plate (30), a ferromagnetic material (33), and induction coils (35, 36) are configured inside a heating plate body (31). A cover plate (32) is configured on the upper portion of the heating plate body (31). A plurality of cooling through-holes (31a) are formed through the bottom surface of the heating plate body (31). The ferromagnetic material (33) has both ends supported by an aluminum bracket (37) inside the heating plate body (31).

Description

High frequency induction heating welding machine and welding method using same}

The present invention relates to a welding machine, and more particularly, a high-frequency induction heating welding machine for improving welding efficiency by enabling pattern welding on a plurality of nonwoven film layers in a mask manufacturing process by a high-frequency induction heating method, and a welding method using the same It is about.

In general, a disposable dust mask has a pleated front portion formed by bending the entire surface of the filter paper several times, a hard finish portion formed by ultrasonic heat welding on both sides of the filter paper with a hook band, and formed on the upper portion of the filter paper so that the As possible, a metal wire is provided so that the metal wire is bent to fit the contours of the user's face with severe bends, and the folds on the front of the filter paper are spread out and evenly adhered to the wearer's nose and chin to increase the dustproof efficiency One disposable dust mask has been devised, and the filter paper is usually made of non-woven fabric.

As such, a mask made of filter paper generally has an upper and lower wing that is positioned toward the user's mouth and developed upward and downward, and has a front part where the upper and lower ends of the upper and lower wings are fused. It is characterized in that it does not have a sewing line because the end main surface is welded to the upper and lower wings and the front part by a known technique.

The above welding technique uses ultrasonic vibration or low-frequency vibration as a method of rubbing the surface of an object to be processed.

That is, by using ultrasonic waves or low frequencies, friction is generated on the surface of the bonding surface and at the same time, a welding operation is performed by pressing using a pressing roll.

For example, in the low-frequency welding method, electric energy in units of 180 to 240 Hz is converted through a power supply, and this is converted into mechanical energy through an electromagnet, and then friction is applied to the left and right with an amplitude of 0.5 to 2 mm with a spring to pressurize. .

However, the conventional low-frequency welding method has a higher output than the ultrasonic vibration, but the use of high vibration affects external mechanical devices due to vibration noise, and there are problems such as a limitation of spring life, an increase in welding time, and noise generation.

In addition, the ultrasonic method is a welding method by frictional heat generation effect due to collision on the surface of the joint by using sound wave vibration. The power is converted into electric energy in units of 15 to 20 kHz through a power supply, and this is converted into an electrical energy in the unit of 15 to 20 kHz. It is welded by adjusting the amplitude with a booster after converting it to mechanical vibration energy. However, the shape, material, size, weight, etc. are limited due to the shape of the instrument horn and the change in frequency characteristics due to heat generation by performing welding with the maximum transmitted energy at the resonance frequency. There was a problem with a limit on the output load of 10 kw or higher, which generates noise and receives noise. In addition, the release material has difficulty in welding due to vibrational frictional heat generation of other characteristics.

Republic of Korea Patent Registration No. 1594572 (registered on February 5, 2016) Korean Patent Registration No. 2088557 (registered on March 6, 2020) Republic of Korea Patent Registration No.0783311 (registered on December 3, 2007)

The present invention has been proposed to improve the above-described problems in the prior art, and by providing an improved welding machine and a welding method capable of welding a nonwoven film using high frequency induction heating, high-speed welding is possible and thus The purpose is to improve the work efficiency accordingly.

The present invention for achieving the above object, a plurality of guide rolls to which a plurality of non-woven fabric films to be welded are guided, a pattern roll for forming a pattern on the guided non-woven film, and a press roll configured on the pattern roll, In the high-frequency induction heating welding machine constituting a configuration comprising an induction heating plate configured under the pattern roll, the induction heating plate is composed of a ferromagnetic material and an induction coil inside the heating plate main body; A cover plate is formed on the heating plate body; A plurality of cooling through holes are formed through the bottom of the heating plate body; The ferromagnetic body is characterized in that both ends are supported by aluminum brackets inside the body of the heating plate.

In addition, the induction coil is wound in a form surrounding the ferromagnetic material, and insulating sheets are provided at upper and lower portions of the ferromagnetic material.

In the present invention, pattern welding on a plurality of nonwoven film layers in the mask manufacturing process can be achieved by a high-frequency induction heating method capable of large-capacity output, thereby improving the heating temperature precision, and thus, high-speed welding and production of products are possible. Show.

1 is a front structural view of a welding pattern roll and an induction heating plate according to an embodiment of the present invention.
Figure 2 is a schematic configuration diagram of the induction heating welding machine of the present invention.
Figure 3 is a cross-sectional view of the inner induction heating plate in the present invention.
4 is an enlarged view of part A of FIG. 3.
Figure 5 is a bottom view of the induction heating plate in the present invention.
6 is a circuit diagram according to an embodiment of the present invention.
7 is a distribution diagram of an induction coil winding inside an induction heating plate according to an application example of the present invention.
8 is a plan view of an induction coil of an induction heating plate according to another embodiment of the present invention.
9 is an inner cross-sectional view of an induction heating plate according to another embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. This embodiment is provided to more completely describe the present invention to those with average knowledge in the industry.

Accordingly, the shape of the constituent elements expressed in the drawings may be exaggerated to emphasize a more clear description. It should be noted that in each drawing, the same configuration may be indicated by the same reference numeral. In addition, detailed descriptions of functions and configurations of known technologies that are determined to unnecessarily obscure the subject matter of the present invention may be omitted.

First, a configuration of a high-frequency induction heating welding machine according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6.

In this embodiment, the welding machine includes a plurality of guide rolls 11, 12, and 13 through which a plurality of non-woven fabric films f1, f2, and f3 to be welded are guided, and the guided non-woven film f1, f2, f3 ), a pattern roll 10 for pattern formation, a press roll 20 configured on the pattern roll 10, and an induction heating plate 30 configured under the pattern roll 10. Will be achieved.

In particular, the induction heating plate 30 includes a ferromagnetic material 33 and induction coils 35 and 36 in the interior of a heating plate body 31 made of aluminum, and a cover plate ( 32) is configured, and a plurality of cooling through holes 31a are formed through the bottom surface of the heating plate body 31, and both ends of the ferromagnetic body 33 are formed by aluminum brackets 37 inside the heating plate body 31. Will be supported. At this time, since the aluminum bracket 37 is a non-magnetic material, it performs a function of inducing the induced electromotive force upward.

It is preferable that the ferromagnetic body 33 is made of a silicon steel plate or a ferrite material while forming a plate-shaped or rod-shaped cross-sectional structure, and the cover plate 32 is made of a Teflon material.

In addition, the induction coil 35 from which power is supplied according to the connection of the power line from one side is wound in a form surrounding the ferromagnetic material 33, and insulating sheets 34 are provided on the top and bottom of the ferromagnetic material 33. The sheet 34 is made of insulating material for preventing short circuits such as Teflon tape or glass tape.

In particular, the induction coil 35 has a structure in which the winding spacing of the side portion (b) is relatively tight compared to the center portion (a) for controlling the temperature distribution as in the application example of FIG. 7 as well as the winding shape as in FIG. 3. You can also make it happen.

On the other hand, the pattern roll 10 is configured with a temperature sensor (10a, 10b) for temperature detection, the temperature sensor (10a, 10b) is a non-contact temperature sensor (10a) or pattern roll installed outside the pattern roll (10) (10) It is preferable that the contact-type temperature sensor 10b inserted inside is selectively used.

The effect of the use of the high frequency induction heating welding machine of the present invention constituting such a configuration will be described.

In the welding machine of the present invention, in a state in which the induction heating plate 30 is configured under the pattern roll 10, a continuous welding operation for each pattern of a product according to the high-frequency induction heating operation is performed.

That is, a plurality of non-woven fabric films (f1, f2, f3) for mask production from one side are guided by the guide rolls 11 and 12 to pass between the pattern roll 10 and the press roll 20 In the process, welding is performed in a certain pattern.

In particular, in the present invention, a strong induced electromotive force is generated from the induction heating plate 30 underneath, so that heat is applied to the surface of the pressure bonding surface of the nonwoven film to achieve welding. As heat generation due to loss of hysteresis, heat is concentrated in a location where the spacing of the induction coils 35 is tight or wound in a stacked form. On the other hand, since the resistance of the induction coil 35 is X _L = 2πfL and the Joule heat is defined as Q = V ² /Rt[J] = I ² Rt, the temperature increases as the resistance value decreases.

In this case, as shown in FIG. 6, in the present invention, the primary power source and the output load are separated through a transformer, and the ground of the output load is connected to form DC, and a high-frequency pulse power is supplied by a PWM waveform. At this time, the induced power of a preset frequency is provided to the induction coil 35. First, after searching and storing a plurality of resonance frequencies, the induced power of any one of the plurality of resonance frequencies is provided. The plurality of resonant frequencies may be automatically changed from a low frequency to a high frequency.

On the other hand, the induction coil 35 in the present invention has a structure in which the winding spacing of the side portion (b) is relatively tighter than that of the center portion (a) to control the temperature distribution, It is possible to adjust the temperature distribution according to the characteristics of the heat and induced electromotive force that is lost from energy to the side shaft.

At this time, it is possible to adjust the set temperature precision of the entire surface of the pattern roll 10 to within 1°C, and by supplying the amount of heat lost during production through induction heating, high-speed production is possible by maintaining the set temperature constant. In addition, the temperature detection position of the pattern roll (emboss roll) 10 is detected in the form of a surface temperature detection using a non-contact type temperature sensor 10a or a contact type temperature sensor 10b inserted into the surface of the pattern roll.

In addition, since the induction heating plate 30 in this embodiment has a plurality of cooling through-holes 31a formed through the bottom surface, it is possible to prevent overheating due to the flow of air.

Therefore, in the high frequency induction heating welding machine of the present invention, the pattern welding on a plurality of nonwoven film layers during the mask manufacturing process can be achieved by a high frequency induction heating method capable of high-capacity output, thereby improving temperature precision and thus enabling high-speed welding. Show.

Meanwhile, FIGS. 8 and 9 show the configuration of an induction heating plate according to another embodiment of the present invention, and it can be seen that the induction coil 36 is mounted on the ferromagnetic body 33.

That is, the induction coil 36 has a structure seated in the form of a return pipe rather than a winding form as in the above embodiment.

In this configuration, since the induction coil 36 is located above the ferromagnetic material 33, the induced electromotive force generated by the heat generation of the induction coil 36 when power is applied is concentrated to the top as shown in FIG. It is possible to further improve the welding efficiency by being transferred to the 10) side.

In addition, although a specific embodiment of the present invention has been described and illustrated above, it is obvious that the structure of the high frequency induction heating welding machine of the present invention can be variously modified and implemented by those skilled in the art.

For example, in the above embodiment, it has been described that the heating plate main body 31 is made of an aluminum material, but it may be made of various types of conductive materials if necessary.

However, such modified embodiments should not be individually understood from the technical spirit or scope of the present invention, and such modified embodiments should be included within the appended claims of the present invention.

10: pattern roll 10a, 10b: temperature sensor
11,12,13: guide roll 20: press roll
30: induction heating plate 31: heating plate main body
32: cover plate 33: ferromagnetic
34: insulation sheet 35, 36: induction coil
37: aluminum bracket

Claims (7)

A plurality of guide rolls (11, 12, 13) through which a plurality of non-woven fabric films (f1, f2, f3) to be welded are guided, and a pattern roll for forming a pattern on the guided non-woven fabric films (f1, f2, f3) In the high-frequency induction heating welding machine having a configuration comprising (10), a press roll 20 configured on an upper portion of the pattern roll 10, and an induction heating plate 30 configured on a lower portion of the pattern roll 10,
The induction heating plate 30,
The ferromagnetic material 33 and the induction coils 35 and 36 are formed in the heating plate main body 31;
A cover plate 32 is formed on the heating plate main body 31;
A plurality of cooling through holes 31a are formed through the bottom of the heating plate body 31;
Both ends of the ferromagnetic body 33 are supported by an aluminum bracket 37 inside the heating plate body 31,
The induction coil 35 is wound in a form surrounding the ferromagnetic material 33, and an insulating sheet 34 is provided on the upper and lower portions of the ferromagnetic material 33,
The induction coil 35 is a high-frequency induction heating welding machine, characterized in that the winding spacing of the side portion (b) is relatively tighter than that of the central portion (a) for controlling the temperature distribution. delete delete The method according to claim 1,
The ferromagnetic material 33 is made of a silicon steel sheet or ferrite,
The cover plate 32 is a high frequency induction heating welding machine, characterized in that made of a Teflon material. delete The method according to claim 1,
The pattern roll 10 is configured with temperature sensors 10a and 10b for temperature detection, and the temperature sensors 10a and 10b are non-contact temperature sensors 10a or pattern rolls installed outside the pattern roll 10. 10) A high-frequency induction heating welding machine, characterized in that a contact-type temperature sensor (10b) inserted into the interior is selectively used. A welding method using a high frequency induction heating welding machine, characterized in that welding to the nonwoven fabric film is performed by the high frequency induction heating welding machine of any one of claims 1, 4 and 6.

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