KR20140134760A

KR20140134760A - Heating pad printed by conductive ink, Heater for steering wheel using the heating pad and manufacturing method thereof

Info

Publication number: KR20140134760A
Application number: KR1020130053855A
Authority: KR
Inventors: 강문식; 강휘원; 박용수; 김준석
Original assignee: (주) 파루; (주)파루에프이
Priority date: 2013-05-13
Filing date: 2013-05-13
Publication date: 2014-11-25

Abstract

The present invention relates to a heating pad printed with a conductive ink and a steering wheel heater using the same and a method of manufacturing the same. More particularly, the present invention relates to a heating pad, in which at least one heating line is printed as a conductive ink, The present invention relates to a heating pad printed with a conductive ink which can be integrally manufactured by injection, and a steering wheel heater using the same and a method of manufacturing the same.

Description

Technical Field The present invention relates to a heating pad printed with conductive ink, a steering wheel heater using the same, and a method of manufacturing the heating pad using a heating pad printed by a conductive ink,

Recently, a technique for improving the comfort of a vehicle by heating a steering wheel of a car cooled in winter has been suggested as one of ways to improve the convenience of the automobile.

Conventionally, a utility model registration No. 02346833 in which a hot line is arranged along a steering wheel (steering wheel) or a steering wheel cover (wheel cover) of an automobile has been disclosed. The above-described prior art includes an operation switch connected to one end of a hot wire and adapted to open and close by a patent registered driver who heats the steering wheel with a power source applied from a battery of the vehicle, and is electrically connected to the hot wire, There has been proposed a handle heating apparatus for a vehicle in which a temperature control unit for cutting off a circuit during heating and overheating is added.

Also, conventionally, a surface heating element manufactured in the form of a band through the patent registration No. 1255812 has been proposed.

The conventional heater for a steering wheel as described above is configured as a release paper on which an adhesive layer is formed by applying a paste layer mainly composed of carbon on one surface of an insulating film. Here, the heater using the carbon paste layer generates heat by a change in resistance value due to carbon when an electrical signal is applied.

However, in the above conventional technology, the first large current is required, and since the resistance value changes during driving for a long time, the heating temperature of the heater is not uniform, so that damage to the wheel cover or a high temperature, A separate device (for example, PTC) for preventing overheating is additionally provided to raise the production cost.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a semiconductor device having a uniform resistance value regardless of a length, And a heating pad printed with a conductive ink capable of generating heat.

The present invention also relates to a heater using a heating pad printed with a conductive ink capable of integrally forming a wheel barber and / or a steering wheel and a heating pad through an injection process in order to facilitate the user when the heater is mounted on the steering wheel, And a manufacturing method thereof.

The present invention includes the following embodiments in order to achieve the above object.

A preferred embodiment of the heating pad printed as the conductive ink according to the present invention is a heating pad which extends in one direction from one side of an insulating film and generates power when a power source is applied and a power source applied from an external power source connected at both ends of the heating line, And the heating line is printed so as to be connected in parallel as the conductive ink.

In another embodiment of the present invention, the heating pad has a total resistance value of 5 to 15 OMEGA.

In another embodiment of the present invention, the heating pad is integrally formed by being injected simultaneously with the steering wheel.

A preferred embodiment of a steering wheel heater using a heating pad printed with a conductive ink according to the present invention includes a heating pad having at least one heating line printed with conductive ink on one side of an insulating film; And a wheel cover integrally formed with the heating pad and having a plurality of cutouts formed in the body so as to conform to the shape of the steering wheel.

In another embodiment of the present invention, the heating wire is at least one wire having the same line width and length and connected in parallel.

A preferred embodiment of a method of manufacturing a steering wheel heater using a heating pad printed with a conductive ink according to the present invention is a method for manufacturing a steering wheel heater using at least one heating wire having the same line width and length on one surface of an insulating film, A printing step of a heating pad printing with conductive ink; A curing step of curing the heating pad printed by the conductive ink in the printing step; A cutting step of cutting the heating pad cured in the curing step to conform to the shape of the pattern of the injection mold; And an injection step of placing the heating pad cut in the cutting step on an injection mold and injecting a liquid plastic resin in a vacuum state in which the inner air is discharged and injecting the resin into a high temperature.

In another embodiment of the present invention, the injection mold is a mold having a pattern matching the shape of the steering wheel.

In yet another embodiment of the present invention, the injection mold is a mold having a pattern that matches the shape of the steering wheel.

Since the heating pad is manufactured by printing one or more heating lines with the conductive ink, the heating pad has a uniform resistance value regardless of the length of the heating line, so that the heating pad can generate heat at a uniform temperature for a long period of time.

Further, the present invention can be manufactured integrally with the wheel barber and / or the steering wheel by simultaneously injecting the heating pad into the injection mold at the time of manufacturing the steering wheel and / or the wheel barber, so that the process of mounting the heater on the steering wheel is very There is an easy effect.

1 is a plan view of a steering wheel heater according to a first embodiment of the present invention,
2 is a wiring diagram of a steering wheel heater using a conductive ink according to the present invention,
3 is a flowchart showing a manufacturing method of a second embodiment of a steering wheel heater using a conductive ink according to the present invention,
4 is a view of a second embodiment of a steering wheel heater using a conductive ink according to the present invention,
FIG. 5 is an internal cross-sectional view of a steering wheel heater in a steering wheel heater using conductive ink according to the present invention,
FIG. 6 is a photograph of the heat generated by the steering wheel heater using the conductive ink according to the first embodiment of the present invention.

Hereinafter, preferred embodiments of a steering wheel heater using a conductive ink according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a plan view of a heating pad printed with a conductive ink according to a first embodiment of the present invention and a steering wheel heater using the same, and FIG. 2 is a wiring diagram of FIG.

1 and 2, a heating pad printed with a conductive ink according to the present invention includes an insulating film 12 made of a plastic resin, at least one heating wire 12 printed with conductive ink on one side of the insulating film 12, And a heating pad 10 made of a conductive material 11.

The insulating film 12 is made of a synthetic resin such as polyimide or polycarbonate, and one or more heating lines 11 are printed on a surface of the insulating film 12 as a conductive ink. The insulating film 12 is formed to extend in one direction and has a length that can include the entire length of the wheel.

The heating lines 11 are printed by conductive ink so as to have at least one mutually same length on one side of the insulating film 12. [ The heating line 11 is printed by the conductive ink so as to have the same length as the same line width as the gravure or roll-to-roll printing method.

The heating line 11 is printed by a printing process such as a screen or a roll-to-roll process with a conductive ink made of a conductive metal powder such as silver nano, copper, or nickel without a resistor.

Here, since the heating line 11 of the present invention is formed by heat generated by the self-resistance value of the heating line 11 printed by the conductive ink, not by heat generated by a conventional resistor such as carbon, the resistance value does not change.

In other words, conventionally, since a heating wire 11 made of carbon and a conductive metal is provided, heat is generated due to an increase in resistance of the carbon, so that a large current is initially applied, and when the temperature rises to a certain temperature, . Such a change in the current value may cause overheating at the time of use for a long time because the current value is not uniform as the resistance value is changed.

However, unlike the prior art, the present invention does not have a separate resistor but generates heat due to the resistance of the heating wire 11 printed by the conductive ink. Here, the resistance of the heating wire 11 can be adjusted according to the line width and the length. By uniformly adjusting the resistance value as the heating wire 11 is formed in parallel, uniform temperature is maintained Heat is generated.

For example, the heating pad 10 has the same resistance value even if the length of the heating line 11 is increased from 40 cm to 50 cm when the total resistance value is stable and uniformly generated at 5 to 15 ?.

That is, as shown in FIG. 2, the heating line 11 is provided with terminals 113 and 113 'to which a power line is connected at one end and the other end, respectively, and terminals 113 and 113' 1 heating line 111 and the second heating line 112 are connected in parallel.

The first heating line 111 and the second heating line 112 are printed so as to have the same length and the same length. Therefore, the resistance values of the first heating line 111 and the second heating line 112 are the same. Accordingly, when the extended length of the heating line 11 is increased, a third heating line (not shown) having the same length as the line widths of the first heating line 111 and the second heating line 112 is added, You can adjust the value.

Accordingly, since at least one heating line 11 having the same line width and length is connected in parallel to at least one heating pad 10 regardless of the length of the heating pad 10, heat can be generated within the same resistance, It is possible.

This can be confirmed by the measurement result of the heating temperature of FIG.

The test samples of FIGS. 6A to 6D were obtained by connecting two heating lines 11 printed in the form of silver nano ink in parallel, applying 12 to 13.5 V, and applying a voltage of 4 V, 20 V, 1 hour, .

6, the temperature is measured several times (one to three times) at three spots (points indicated by "+" in the drawing) in the entire heating pad 10 The double maximum temperature is indicated. 6A, for example), the temperature of the current spot is indicated as '(for example) 35.0 DEG C' and the maximum temperature is displayed through the bar projecting vertically at the lower right.

More specifically, FIG. 6A is a screen for measuring the temperature when four minutes have elapsed since the voltage was applied. As a result, FIG. 6 (a) shows the temperature of three points (spots) in the entire region of the heating pad 10 measured one to three times, and the maximum temperature in each spot Respectively.

Similarly, FIG. 6 (b) shows the temperature measured over a total of 1 to 3 times when 20 minutes passed after the voltage was applied, and the maximum temperature of each spot was indicated.

FIG. 6C shows the maximum temperature by measuring the temperature one to three times in total when one hour has elapsed since the voltage was applied.

6D) shows the maximum temperature by measuring the temperature one to three times in total when two hours have elapsed since the voltage was applied.

As a result of the above experiment, it was confirmed that the maximum temperature in each spot was exothermic within a range of 38 to 45 ° C, 39 to 47 ° C, and 36 to 44 ° C, without a rapid temperature change even after a lapse of time. That is, according to the present invention, the number of heating lines 11 to be printed by the conductive ink connected in parallel so as to have a resistance value of 5 to 15? Is controlled, and as a result of voltage application, the number is controlled, The heat is generated at a uniform temperature at which no temperature change occurs due to the change of the resistance value during the heat generation process.

In addition, the applicant of the present invention measured the heating temperature by setting the resistance value of the heating pad 10 to 5? Or less and 15? Or more. As a result of the measurement, the resistance value is higher than 60 ° C when the resistance value is 5Ω or less, and when the resistance value is 15Ω or more, the temperature is lower than 20 ° C.

Accordingly, when the heating pad 10 of the present invention is maintained at a resistance value of 5 to 15 ?, the heating pad 10 generates heat at a temperature that does not affect the human body, the steering wheel, and the wheel curler 20.

The heating pad 10 according to the first embodiment is bonded to the steering wheel through a bonding means such as a double-sided tape, and can be used in winter by connecting a power line. Alternatively, the heating pad 10 may be integrated with the steering wheel and / or the cover of the steering wheel. This corresponds to any one of various embodiments of the present invention.

Hereinafter, the wheel cover 20 in which the heating pad 10 is integrally formed and the manufacturing method thereof will be described as a second embodiment.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of manufacturing a steering wheel heater using a heating pad printed with a conductive ink, And Fig. 5 is an internal sectional view of Fig.

Referring to FIG. 3, the second embodiment of the present invention includes a printing step S10 of printing at least one heating line 11 as silver nano ink on one surface of an insulating film 12, A cutting step (S30) of cutting the heating wire in accordance with the shape of the wheel barber (20) after the curing step (S20), and a cutting step (S40), and an inspection step (S50) of visually inspecting the product after injection.

The printing step S10 is a step of printing one or more heating lines 11 in parallel with conductive ink (for example, silver nano ink) on one side of the insulating film 12 in accordance with the shape of the wheel barber 20. Here, the heating lines 11 are printed as gravure, roll-to-roll, or screen printing so that one or more heating elements having the same length and the same length are connected in parallel. In addition, the heating line 11 is set to have a range of 5 to 15? Regardless of the entire length. When the length of the heating line 11 is extended, the new heating line 11 is further connected in parallel so that the total resistance is maintained within 5 to 15 ?.

The curing step S20 is a step of curing the conductive ink by being accommodated for a predetermined time in a curing apparatus maintained at a room temperature or a high temperature after the printing step S10. Since the curing step S20 is generally known, a detailed description thereof will be omitted.

The cutting step S30 is a step of cutting the heating pad made up of the heating wire 11 printed on the insulating film 12 to match the shape of the wheel barber 20. The heating pad 10 is formed in a flat state in which the heating wire 11 is printed on one side of the insulating film 12. This is cut to conform to the pattern of an injection mold to be described later. The shape of the wheel barber 20 was engraved in the pattern of the injection mold. Therefore, the operator is cut so that the heating pad 10 can be included in the mold pattern of the wheel cover 20, having a smaller area than that of the wheel cover 20 or matching the shape of the wheel cover 20.

In the injection step S40, the heating pad 10 cut to have a shape matching the mold pattern of the wheel pad in the cutting step S30 is placed in the mold and used for manufacturing the wheel cover 20 such as urethane resin. Is injected and injected. Here, the injection step S40 may be a vacuum injection method in which internal air can be discharged because holes due to air remaining between the liquid resin and the heating pad can be formed. Since the vacuum injection is generally known, a detailed description thereof has been omitted.

The inspection step S50_ is a step of inspecting a product formed by integrally molding the heating pad 10 and the wheel barber 20 as described above. This process is visually confirmed by the operator, and a detailed description thereof is omitted.

The wheel cover 20 injection-molded integrally with the heating pad 10 is as shown in FIGS.

Referring to FIGS. 4 and 5, the body 21 constituting the plurality of cut-outs 22 is injection-molded on the top, bottom, left and right sides of the wheel barber 20 in conformity with the shape of the steering wheel. The body 21 is manufactured by a vacuum injection process in which a plastic resin is injected in a vacuum state in which internal air is discharged after the heating pad 10 is seated in a metal mold.

As shown in FIG. 5, the inner surface of the wheel cover 20 includes at least one heating line 11 having the same line width and length and printed on the conductive ink. The heating wires 11 are printed in parallel structures connected to the same power terminals 113 and 113 'at both ends.

The power terminals 113 and 113 'are connected to external power sources at both ends of the heating wire 11 and the power terminals 113 and 113' are drawn out to the outside of the body 21 of the wheel barber 20. .

The heating pad 10 of the heating pad 10 is formed integrally with the inside of the wheel barber 20 in accordance with the intention of the designer. It is also possible to manufacture it.

In addition, the wheel barber 20 having the heating pad 10 integrated therewith has been described with reference to the embodiment that is injected through the urethane resin. However, the wheel barber 20 may be integrally formed with all the wheel bars 20 manufactured by the injection process .

Further, the present invention is not limited to the wheel cover 20, but may be integrally formed on the steering wheel in the same manner as the manufacturing process described above in the manufacturing mold of the steering wheel made of plastic resin. Here, the manufacturing process of the wheel barber 20 and the manufacturing process of the steering wheel are well known in the art, so that detailed description of the process and apparatus is omitted.

As described above, the heating pad 10, in which at least one heating line 11 printed as conductive ink is connected in parallel, can be integrally formed with the wheel cover 20 and the styroly wheel, so that it is very easy to install the heater. In addition, since the at least one heating line 11 is printed in parallel with the heating pad, the heating pad can uniformly maintain the entire resistance value regardless of the length, and can generate heat uniformly without a sudden temperature change.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the following claims And changes may be made without departing from the spirit and scope of the invention.

10: Heating pad 11: Heating wire
12: Insulation film 20: Wheel chair
21: Body 22: Section improvement
111: first heating line 112: second heating line
113: Terminal

Claims

And a power terminal for applying a power to the heating line, the power being applied from an external power source connected at both ends of the heating line,
Wherein the heating line is printed so as to be connected in parallel as a conductive ink.

The heating pad according to claim 1, wherein the heating pad
And the total resistance value is 5 to 15 OMEGA.

The heating pad according to claim 1, wherein the heating pad
A heating pad which is printed with conductive ink ejected at the same time as the steering wheel and integrally formed.

A heating pad having at least one heating line printed with conductive ink on one side of the insulating film; And
A steering wheel heater using a heating pad printed with a conductive ink including a body in which the heating pad is integrally formed on the inside and a wheel cover on which a plurality of cutouts are formed so as to correspond to the shape of a steering wheel in the body, .

5. The apparatus according to claim 4, wherein the heating line
Wherein the at least one heating pad is at least one of a plurality of conductive wires connected in parallel with the same line width and length.

A printing step of printing one or more heating lines, which have the same line width and length on one surface of the insulating film, and which are heated in parallel when they are connected to each other, with conductive ink;
A curing step of curing the heating pad printed by the conductive ink in the printing step;
A cutting step of cutting the heating pad cured in the curing step to conform to the shape of the pattern of the injection mold; And
And a step of placing the heating pad cut in the cutting step on an injection mold and injecting in a vacuum state, wherein the heating pad is printed with a conductive ink.

7. The apparatus of claim 6, wherein the heating pad
Wherein a total resistance value of the heating pad is 5 to 15 OMEGA.

The injection molding machine according to claim 6, wherein the injection mold
Wherein the heating pad is a metal mold having a pattern matching the shape of the steering wheel.

The injection molding machine according to claim 6, wherein the injection mold
Wherein the heating pad is a metal mold having a pattern matching the shape of the steering wheel cover.