JPS5834901A - Method of producing plastic resistance element - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides PTC! The present invention relates to a plastic resistor element having 11 properties, and more particularly to a method for manufacturing the same.

A plastic resistor having PTC characteristics utilizes the fact that the contact resistance of conductive particles dispersed in crystalline U plastic increases as the concentration of the plastic resistor increases. In order to energize such a plastic resistor and use it as a heat generating element, it is necessary to form electrodes on the surfaces of the plastic resistor's opposing surfaces. It is formed by plating or vapor depositing a metal such as , Nl, or Cu on the surface of a plastic resistor.

However, for plastic resistors whose electrodes are formed using this method, the coefficient of thermal expansion of the metal constituting the electrodes and the coefficient of thermal expansion of the plastic resistor are significantly different, so the There is a mgi that peels off from the plastic resistor.

In view of the above-mentioned problem of electrode peeling in plastic resistor elements reported using conventional manufacturing methods, the present invention has been developed to provide
One object of the present invention is to provide a method for manufacturing a plastic resistor element that can manufacture an improved plastic resistor element in which the electrodes do not peel off from the plastic resistor element.

According to the present invention, in a method for manufacturing a plastic resistor element having PTC characteristics, two metal plates each having a porous metal body joined to one of the peaks are joined to the porous metal body. This is achieved by a method for manufacturing a plastic resistor element, which is characterized in that the two metal plates are spaced apart so that their peaks face each other, a thermosetting plastic resistor 411 is filled between the two metal plates, and the thermosetting plastic resistor 411 is cured by heating. Ru.

According to the method for manufacturing a plastic resistor element according to the present invention, a part of each electrode consisting of a porous metal plate and a metal body to which it is bonded, that is, a porous metal body, falls within the corresponding surface of the plastic resistor. It is buried along the mountain,
Since the electrodes are firmly held to the plastic resistor by the porous metal body embedded within the plastic resistor, the electrodes are effectively prevented from peeling off from the plastic resistor even when subjected to cooling and heating cycles due to intermittent use. Therefore, it is possible to obtain a plastic resistor element that can be used for a long period of time with stable performance.

In the method for manufacturing a plastic resistor element according to the present invention, a thermosetting plastic resistor is used so that the plastic resistor formed between two metal plates spaced apart has a predetermined density. It is preferable to pressurize the resin when filling the body 41i11, or to heat the resin while pressurizing it after filling the thermosetting plastic resistor resin. Further, the porous metal body used in the method of manufacturing a plastic resistor element according to the present invention may be a wire mesh made of various metals or alloys, a perforated metal plate, etc., and in particular, when a metal body made of stainless steel is used. JIS standard 5US3
It may be made of stainless steel such as 04.5US310.5tJS310S.

The present invention will now be described in detail with reference to preferred embodiments thereof, with reference to the accompanying drawings.

The attached FIGS. 1 to 4 are sectional views showing the manufacturing process of one embodiment of the manufacturing method according to the present invention for manufacturing a cylindrical plastic resistor element, and in particular, FIGS. FIG. 2 is a two-dimensional 11-plane view showing two metal plates each having a porous metal body joined to one side thereof and spaced apart such that the peaks to which the porous metal bodies are joined face each other; Both figures are fishing hand 1i1i figures, and figures 3 and 4! ! l
1 and 2 are a vertical sectional view and a side view of the fishing handle Ii, respectively, corresponding to FIG. 1 and FIG. .

In the method of manufacturing a plastic resistor element according to the illustrated embodiment, first, cylindrical metal plates 1 and 2 having different diameters are prepared, and the inner cylindrical portion of the cylindrical metal plate 1 having a large diameter is
A wire mesh 3 is joined to J, and a wire mesh 4 is joined to the cylindrical outer circumferential surface of a small diameter cylindrical metal plate 2. In this case, the metal meshes 3 and 4 are bonded to the cylindrical metal plates 1 and 2, respectively, by, for example, N1-plating, etc., with the metal meshes 3 and 4 in contact with the corresponding cylindrical metal plates 1 and 2, respectively. This may be done by applying

Next, as shown in the 1st@ and 2nd f%lI, the two cylindrical metal plates 1 and 2 with the wire meshes joined in this way are arranged concentrically so that the peaks to which the wire meshes are joined face each other. do. Then, as shown in FIGS. 3 and 4, these two.

A thermosetting plastic resistor resin 5 is filled in the spaces between the cylindrical metal plates 1 and 2, and the thermosetting plastic resistor resin is hardened by heating while applying pressure.

Plastic resistor elements manufactured according to the embodiments described above and conventional l1lI! [In order to perform a performance comparison with a plastic resistor element manufactured according to the method, cylindrical metal plates 1 and 2 were copper plates with a thickness of 0.8 s and plated with N1 having a thickness of 10 μm, Samples A+ to A8 were manufactured using the materials shown in Table 1 below as wire meshes 3 and 4, and a durability test was conducted under the test conditions shown in Table 2 below.

The conventional method for manufacturing the plastic resistor element subjected to this durability test is as shown in FIGS. Electroless Cu plating (0.1-0.
4μ), Cu electroplating (about 5μ), and N1 electroplating (about 5μ) to form electrodes 11 and 12 having a total thickness of about 10μ. Moreover, these samples 81-As and the plastic resistors manufactured by the conventional method for manufacturing plastic resistor elements as comparative examples were found to be outside! It is a cylindrical body with a size of 40 m5, an inner diameter of 3211 mm, and a length of 25 mm, and contains about 30 wt% polyvinylidene fluoride, about 50 wt% unsaturated polyester, about 20 wt% carbon black, and a trace amount of filler. This is a plastic resistor element having PTO characteristics.

Table 1 The results of this durability test are shown in Table 3 below.

From this Table 3, it can be seen that the electrical resistance value of the plastic resistor element manufactured by the conventional manufacturing method more than doubled before and after the durability test, and even though some of the electrodes were peeled off. On the other hand, the plastic resistor element A+-A@ manufactured according to the above-described embodiment of the present invention has almost no change in its electrical resistance value, and no peeling of the electrodes is observed. It can be seen that the plastic resistor elements manufactured according to the method have much better performance than the plastic resistor elements manufactured by conventional manufacturing methods.

In the above, the present invention has been described in detail with respect to an embodiment for manufacturing a cylindrical plastic resistor element.
It will be obvious to those skilled in the art that the present invention is not limited to these embodiments, and that various embodiments are possible within the scope of the present invention.

[Brief explanation of the drawing]

1 to 4 are sectional views showing the manufacturing process of one embodiment of the manufacturing method according to the present invention for manufacturing a cylindrical plastic resistor element. Figure 2 is a vertical i-plane view showing two metal plates each having a porous metal body joined to one side thereof and spaced apart such that the faces to which the porous metal bodies are joined face each other. Figures 3 and 4 correspond to Figures 1 and 2, respectively, showing a state in which thermosetting plastic resistor resin is filled in the layers of gold film plates spaced apart from each other. Both diagrams ll1lPi surface view and both diagrams are cross-sectional views of the fishing rod, and FIGS. 5 and 6 are diagrams corresponding to FIGS. 1 and 2, respectively, showing a plastic resistor element manufactured in H by a conventional manufacturing method. A cross-sectional view of the target 11' and a WJ view of the fishing hook 1liWJ in both figures. 1.2... Cylindrical metal plate, 3.4゛... Wire mesh, 5.
...Thermosetting plastic resistor resin, 6... Plastic resistor, 10... Plastic resistor element, 1
1.12...Electrode patent applicant: Toyota Automatic Kushi Industries Co., Ltd.
Attorney Masashi Akashi Figure 2 Figure 1 Figure 4 Figure 3 Figure 6 Figure 5 0

Claims (1)

[Claims] In a method for manufacturing a plastic resistor element having PTC characteristics, two metal plates each having a porous metal body joined to one side thereof are spaced apart such that the faces to which the porous metal body is joined face each other, A method for manufacturing a plastic resistor element, characterized in that the - of the two metal plates is filled with a thermosetting plastic resistor **, and then cured by heating.