JP2007273130A - Planer heating element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stabilize quality by precisely measuring a resistance value of an electrode or a resistor. <P>SOLUTION: This planer heating element 1 includes an electrode printing condition detecting means 7 and a resistor printing condition detecting means 8 printed with predetermined lengths and widths in a part different from a heat generating part, and a resistance value between both end parts can be measured. Thereby, the resistance value can be precisely and easily measured as representative characteristics after printing and drying the electrode 3 formed by printing on an electrically insulating base material 2, and a polymer resistor 4, which is superimposed on the electrode 3, is printed, is fed by the electrode 3, and generates heat. Thus, the electrode 3 and the polymer resistor 4 can be individually managed. The planer heating element of high quality with stabilized characteristics of the electrode 3 and polymer resistor 4 can be manufactured by feed-backing to printing and drying conditions such as viscosity of the electrode 3 and the polymer resistor 4 based on the individual management. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a flexible and deformable thin sheet heating element that can be used as a heater when mounted on an appliance or the like.

  Conventionally, in the heat generating part of this type of planar heating element, a base polymer and a conductive material such as carbon black, metal powder, and graphite are dispersed in a solvent. (For example, see Patent Documents 1, 2, and 3).

  2 is a plan view of a conventional sheet heating element having PTC characteristics, FIG. 3 is an enlarged plan view of the main part of FIG. 2, and FIG. 4 is a schematic sectional view of the sheet heating element when bonded together. . As shown in FIG. 2, the sheet heating element 50 has positive and negative widths obtained by printing and drying a conductive paste on the outer surface of the upper surface of an electrically insulating base material 51 such as a polyester sheet. A pair of main electrodes 52, 53 having a large width and a large number of narrow branch electrodes 52a, 53a alternately led toward the electrodes 53, 52 opposed to the main electrodes 52, 53, and power is supplied from the branch electrodes 52a, 53a. In this manner, a polymer resistor 54 obtained by printing and drying a polymer resistor ink is provided on the branch electrodes 52 a and 53 a and on the upper surface of the substrate 51, and the same material as the substrate 51 is coated. The material 55 covers and protects the main electrodes 52 and 53, the branch electrodes 52a and 53a, and the polymer resistor 54. The polymer resistor 54 is supplied with power from a large number of branch electrodes 52a and 53a to generate current and generate heat.

  When a polyester film is used as the base material 51 and the covering material 55, for example, a polyethylene-based heat-fusible resin (not shown) is bonded in advance to the covering material 55, and the pressure is applied while applying heat (heating time). Pressure), the base material 51 and the covering material 55 are joined via the heat-fusible resin. As a result, the main electrodes 52 and 53, the branch electrodes 52a and 53a, and the polymer resistor 54 are isolated from the outside world, and long-term reliability is imparted.

As a means for pressurizing at the time described above, FIG. 4 shows a schematic cross-sectional view when the covering material 55 is stuck together, but a laminator 58 composed of two heating rolls 56 and 57 rotating in the direction of the arrow is generally used. Is. The PTC characteristic is a resistance temperature characteristic in which the resistance value increases as the temperature rises, and when the temperature reaches a certain temperature, the resistance value rapidly increases (takes the initial letter of English Positive Temperature Coefficient, which means that the resistance has a positive temperature coefficient) The polymer resistor 54 having PTC characteristics can provide a planar heating element having a self-temperature adjusting function.
Japanese Patent Laid-Open No. 56-13689 JP-A-6-96843 JP-A-8-120182

  In the conventional planar heating element 50, the main electrodes 52 and 53 and the branch electrodes 52a and 53a or the polymer resistor 54 are thin films obtained by printing and drying. Due to variations in the characteristics of the conductive paste or polymer resistor ink due to, printing and drying conditions, etc., the result is a significant change in the performance of the finished sheet heating element, for example, too hot or not warming, Another problem is that deterioration due to secular change increases.

  Therefore, management of conductive paste or polymer resistor ink, stabilization of printing / drying conditions, and the like, as a representative characteristic after printing / drying, a resistance value between the main electrodes 52 and 53 is measured and the resistance is measured. Management etc. were made based on the value.

  However, since the resistance value between the main electrodes 52 and 53 is the combined resistance of the main electrodes 52 and 53 and the branch electrodes 52a and 53a and the polymer resistor 54, the main electrodes 52 and 53 and the branch electrodes 52a and 53a or high It is not clear which of the molecular resistors 54 is causing the variation, and there is a concern that even if both are varied, the characteristics tend to be reversed and are not understood.

  Therefore, even if it is attempted to measure the resistance of the main electrodes 52 and 53 and the branch electrodes 52a and 53a or the single portion of the polymer resistor 54, there is no portion that can be measured only in a narrow range, and there is a concern that the measurement error will be larger. In particular, since the polymer resistor 54 is printed and dried over the branch electrodes 52a and 53a, there is a problem that only the combined resistance can be measured.

  SUMMARY OF THE INVENTION In view of the above-described problems of the conventional technology, the problem to be solved by the present invention is to provide a planar heating element with stable quality by enabling the resistance value of an electrode or a resistor to be accurately measured. .

  In order to solve the above problems, an electrically insulating substrate, a plurality of electrodes formed by printing on the electrically insulating substrate, and a printed material superimposed on the electrode, a resistor that is fed by the electrode and generates heat, A covering material that covers the electrode and the resistor and is in intimate contact with the electrically insulating substrate, and is formed by printing the electrode or the resistor with a predetermined length and width on a portion different from the heat generating portion; A printing condition detecting means for measuring a resistance value between both ends is provided.

  By this printing condition detection means, the resistance value is accurately obtained as a representative characteristic after printing and drying of the electrode formed by printing on the electrically insulating base material and the resistor printed on the electrode and fed with heat from the electrode to generate heat. The electrode and resistor can be managed individually, and based on this, feedback to the printing and drying conditions, etc., and the quality of the surface heating element with stable characteristics of the electrode and resistor It can be made.

  The planar heating element of the present invention can manage the electrode and the resistor individually, and can provide a stable heating element.

According to a first aspect of the present invention, there is provided an electrically insulating substrate, a plurality of electrodes formed by printing on the electrically insulating substrate, a resistor that is printed over the electrodes, and is fed with heat from the electrodes, and the electrodes And a covering material that covers the resistor and is in close contact with the electrically insulating substrate, and the electrode or resistor is printed and formed at a predetermined length and width on a portion different from the heat generating portion. The printing condition detection means is provided to measure the resistance value between them.
The printing condition detection is such that the electrode or the resistor is printed with a predetermined length and width on a portion different from the heating portion composed of the electrode and the resistor, and the resistance value between the both ends is measured. As a representative characteristic after printing and drying of an electrode formed by printing on an electrically insulating substrate and a resistor that is printed over the electrode and fed with heat from the electrode and generates heat, the resistance value is accurate. The electrode and resistor can be managed individually, and the characteristics of the electrode and resistor can be fed back to the printing and drying conditions such as the viscosity of the electrode and resistor based on this. However, it becomes possible to manufacture a planar heating element with stable quality.

  In the second invention, in particular, the printing condition detecting means of the first invention has a configuration in which the electrode or the resistor is printed and formed at a substantially outer position of the planar heating element.

  The printing condition detection means is formed by printing the electrode or resistor at a substantially outer position of the sheet heating element, so that the measurement range of the electrode or resistor can be increased, and the printing condition detection means resistance value Can be accurately measured easily, and the outline position of the planar heating element is clarified, and printing misalignment, outline misalignment, and the like are easily understood, and workability is improved.

  According to a third aspect of the invention, in particular, the printing condition detecting means of the first to second aspects of the invention is configured such that the electrode and the resistor are printed in parallel so as to maintain a predetermined distance at a substantially outer position of the planar heating element. is there.

  Since the electrode and the resistor are printed in parallel so as to maintain a predetermined distance at a substantially outer position of the planar heating element, the predetermined distance between the electrode and the resistor changes, for example, between the electrode and the resistor due to overlapping , And the gap between the electrode and the resistor can change the appearance of the print, and for example, if the manufacturing device of the sheet heating element has a displacement adjustment, the displacement adjustment can be performed. Becomes easier.

  The present invention is not limited to the present embodiment. Further, in the description of the present embodiment, the same reference numerals are given to the same configurations and the effects and the same description is not repeated.

(Embodiment 1)
FIG. 1 is a plan view showing a planar heating element according to Embodiment 1 of the present invention.

  In FIG. 1, a sheet heating element 1 is a pair of silver paste printed and dried on the top surface of a thin rectangular electrical insulating substrate 2 such as a polyester film laminated to a polyester nonwoven fabric (not shown). Electrically positive and negative electrodes) 3 and a polymer resistor 4 as a resistor formed by printing and drying polymer resistor ink so as to overlap the electrode 3. A thin-walled polyester film or the like formed in advance with an adhesive resin layer (not shown) such as an acrylic adhesive having adhesiveness with the electrode 3, the polymer resistor 4, and the electrically insulating substrate 2. A sheet heating element 1 is formed by laminating a covering material 5 such as a nonwoven fabric laminated with an electrically insulating overcoat material.

  The electrode 3 has a pair of wide main electrodes (corresponding to the positive side and the negative side of the DC power source) so as to face each other, and the outer side in the longitudinal direction of the sheet heating element 1 and the outer side. A plurality of branch electrodes 3c, 3d are led out from the main electrodes 3a, 3b alternately toward the main electrode on the other side, and are formed in a comb shape as a whole. When the polymer resistor 4 disposed so as to overlap with the power is supplied from a large number of branch electrodes 3c and 3d, a current flows through the polymer resistor 4 to generate heat.

  In addition, the electrode printing condition detection means 7 and the resistor printing condition detection means 8 are printed and formed in parallel with a predetermined size so as to maintain a predetermined distance on a part of the substantially outer position 1a in the longitudinal direction of the planar heating element 1. is there.

Here, the electrode printing condition detection means 7 and the resistor printing condition detection means 8 are printed with a predetermined length and width on a portion different from the heat generation portion, and the resistance value between the both ends is measured. Since the electrode printing condition detecting means 7 and the resistor printing condition detecting means 8 are provided, the electrode 3 and the electrode 3 formed by printing on the electrically insulating base material are printed on top of each other, and are fed from the electrode 3 to generate heat. As a representative characteristic of the molecular resistor 4 after printing and drying, the resistance value can be accurately and easily measured immediately after printing, and the electrode 3 and the polymer resistor 4 can be individually managed. By feeding back to the printing / drying conditions such as the viscosity of the electrode 3 and the polymer resistor 4, it is possible to manufacture a planar heating element having a stable characteristic of the electrode 3 and the polymer resistor 4.

  The electrode printing condition detecting means 7 and the resistor printing condition detecting means 8 are formed by printing the electrode or the resistor at a substantially outer position of the planar heating element 1. The measurement range can be enlarged, the electrode printing condition detection means 7 and the resistor printing condition detection means 8 can be measured accurately and easily, the outline position of the sheet heating element 1 becomes clear, and printing deviation This makes it easier to understand misalignment and improves workability.

  In addition, since the electrode printing condition detection means 7 and the resistor printing condition detection means 8 are printed in parallel so as to maintain a predetermined distance at a substantially outer position of the sheet heating element 1, the electrode printing condition detection means 7 and the resistance The predetermined distance of the body printing condition detecting means 8 changes, for example, the continuity change between the electrode printing condition detecting means 7 and the resistor printing condition detecting means 8 or the change of the electrode printing condition detecting means 7 and the resistor printing condition detecting means 8. Thus, it is possible to detect printing misalignment, and if the manufacturing device of the sheet heating element 1 is provided with position shift adjustment, the position shift adjustment can be easily performed.

  As described above, the sheet heating element according to the present invention enables the electrode or resistor to be accurately measured so that the electrode and the resistor can be individually managed, and the sheet heating of stable quality can be obtained. It can be used on the body, in car seats and handles, and other appliances that require heating.

The top view which shows the planar heating element in Embodiment 1 of this invention Plan view showing a conventional planar heating element An enlarged plan view of the main part of the same heating element Schematic configuration diagram showing when the covering material of the same heating element is bonded

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Planar heating element 2 Electrically insulating base material 3 Electrode 3a, 3b Main electrode 3c, 3d Branch electrode 4 Polymer resistor (resistor)
5 Coating material 7 Electrode printing condition detection means 8 Resistor printing condition detection means

Claims (3)

An electrically insulating substrate, a plurality of electrodes formed by printing on the electrically insulating substrate and the electrode, printed over the electrode, a resistor that is fed by the electrode and generates heat, and covers the electrode and the resistor, A coating material that is in close contact with the electrically insulating substrate is provided, and the electrode or resistor is printed and formed at a predetermined length and width on a portion different from the heat generating portion, and the resistance value between the two end portions is measured. A sheet-like heating element provided with a printing condition detection means configured to do so. The planar heating element according to claim 1, wherein the printing condition detecting means is formed by printing the electrode or the resistor at a substantially outer position of the planar heating element. The planar heating element according to any one of claims 1 to 2, wherein the printing condition detection means is formed by printing the electrode and the resistor in parallel so as to maintain a predetermined distance at a substantially outer position of the planar heating element.