JPS59198117A - Electrode for high frequency welder - Google Patents

Abstract

PURPOSE:To provide a sparkproof electrode for a high frequency welder which enables a high frequency welding without causing a spark even when made of an easy to spark material such as vinyl chloride based copolymer by covering the metal surface with a specified inorganic electrically insulating substance. CONSTITUTION:An inorganic electrically insulating substance with a dielectric loss of 0.001-0.02, a water absorption rate of 0.1% or less and the thickness of 1-150mum or less selected from micas, crystal, glasses, ceramics, metal oxide and sulfur is used to cover the metal surface composing an electrode and a desired electrode is obtained. It is desired that Al is used as electrode, the surface thereof is alumite processed by anodic oxidation and then, covered with an inorganic electrically insulating substance as boemite especially in the ease of manufacture, the strength and uniformity of the film and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrode suitable for use in a high frequency fusing machine such as a high frequency welder or sewing machine, which prevents sparks. More specifically, it relates to electrodes with a specific structure that prevents sparks from occurring during the high-frequency bonding process used when assembling interior interior materials for automobiles, ships, aircraft 2, and general homes.

Conventionally, soft and hard polyvinyl chloride films and polyvinyl chloride leather have been subjected to high-frequency fusion processing and have been put to practical use in a wide range of daily necessities, including toys, stationery, rain gear, and bags. Among these, high-frequency welders, which are used to weld polyvinyl chloride, have the largest number of machines.

Welding using a high-frequency welder generates heat internally in the polyvinyl chloride film or sheet, resulting in a more beautiful welding surface compared to external heating, and it is possible to weld any shape in one shot using an electrode in seconds, making it extremely High productivity. This bonding process is most suitable for robotizing and in-line bonding processes because it has advantages such as being able to fuse in a short time and patterning the electrode shape in one shot.

In particular, in the case of interior material products for automobiles, ships, aircraft, and general households, a laminate is usually prepared in advance using a fabric with a high-frequency adhesive layer as the facing material, urethane foam as the cushioning material, and nylon nonwoven fabric as the backing material. Patterning is carried out by arbitrary high-frequency fusion in the shape of . In this case, a high-frequency welder is used, which has a wide gap between the upper and lower electrodes that pattern the surface of the covering material in an arbitrary shape, and can apply a high voltage with a higher output and a higher frequency than a high-frequency weld made of polyvinyl chloride. Ru. If the welding time is prolonged to obtain practical fusing force embossing reproducibility (patterning), a certain type of discharge phenomenon called sparking (sparking property) may cause damage, discoloration, or holes on the surface of the covering material. However, there was a drawback that it spoiled the decorative appearance.

Rubber and cotton cloth coated with rubber, glass fiber impregnated with silicone resin, polyester resin wrapped in paper, and tetrafluoroethylene (Teflon) as electrical insulation underlays to improve spark resistance. Films, cloth impregnated with cloth (Empire Cloth), phenolic resin boards, asbestos, cellophane, mica, glass, etc. are used.

However, all of these methods were effective only when applied to low-power high-frequency welds, such as high-frequency welds of thin polyvinyl chloride sheets.

High-frequency welding of a thick laminate such as a back-coated fabric with a high-frequency adhesive layer and a urethane foam cushioning material on the back-coated surface, and a backing material made of Chiron non-woven fabric. In some cases, even if the above measures are taken, practical front welding (fabric and L/9 foam), back welding (urethane foam and nylon nonwoven fabric), and embossing reproducibility (patterning) cannot be obtained. However, the higher the output of the welder used, the more sparks occur before the melting and embossing reproducibility is achieved.

On the other hand, seating, wall materials, ceiling materials, and carpets used in automobiles, ships, aircraft, hospitals, theaters, and other public facilities are particularly important from the viewpoint of protecting people in the event of a fire and preventing the spread of fire by law. These interior materials are increasingly required to have high flammability. Interior facing materials are being replaced by polyvinyl chloride leather and more decorative, textured fabrics.

One method of making fabric flame retardant is to back coat the back side of the fabric with acrylic copolymer latex containing flame retardants.
Because acrylic copolymer latex is inherently flammable, large amounts of flame retardants are required to impart flame retardancy to the fabric.

Fabrics back-coated with acrylic copolymer latex containing flame retardants have drawbacks such as impractical high-frequency adhesion and hard texture.0 Vinyl chloride copolymer latex and vinylidene chloride copolymer latex are Because it is inherently flame retardant and has high-frequency adhesive properties, it is attracting attention as a latex for interior fabric back coats that require particularly high flame retardant properties and high-frequency adhesive properties.However, vinyl chloride copolymers Latex, vinylidene chloride copolymer latex has very good high frequency sensitivity, so while applying high frequency and high voltage with a high frequency welder, the high frequency adhesive layer is overheated and melted, and the resin component flows out due to the pressure of the electrode part, resulting in a thin film. The drawback was that a voltage exceeding the dielectric strength was applied to the bonded area, causing dielectric breakdown and sparking.

There was a need for a high-frequency welding or sewing machine that could easily use a non-flammable, high-frequency adhesive vinyl chloride/vinylidene chloride copolymer latex for fabric back coats without causing sparks.

As a result of our earnest efforts, we have developed the present invention, which is a widely used electrode in which both sides are coated with a specific inorganic electrical insulating material. We have discovered that even materials that easily spark can be welded at high frequency without causing sparks.

Although specific explanations and examples will be described below, it goes without saying that the present invention is not limited only to these explanations and examples.

The key to preventing sparks is the selection and use of high frequency, high voltage insulation layers.

The insulating sheet commonly used for high frequency welding of thin polyvinyl chloride is a fibrous sheet impregnated with an insulating material such as polyester resin, silicone resin, or phenolic resin. When high-frequency bonding is performed on the back-coated fabric with the high-frequency adhesive layer on the laminate material of the upholstery, cushion shell, and backing material, the insulating sheet retains this fiber structure.
The drawback was that sparks were easily generated in the uneven parts due to the fiber structure.

The structure of a high-frequency welder (sewing machine) basically consists of six blocks. This will be explained according to Figure-12.

It is a general commercial 100V or 200V single-phase or three-phase alternating current with a frequency of 50 or 60 cycles, which is first received by the low frequency and low voltage power receiving circuit 1 from the distribution line.

The power necessary for the high frequency oscillation circuit is supplied from this AC main line through a power filter in the device, and is converted by a transformer in the device to a high voltage of the required magnitude in the low frequency high voltage circuit 2.

The heater power source for the oscillation tube uses general commercial AC as is.
The high-voltage direct current supplied to the anode of the oscillation tube is converted into direct current by the high-voltage direct current circuit 3.

As a high voltage transformer, a normal oil-filled, self-cooled, iron-core wire-wound coil is used.

Semiconductor rectifiers and copper vapor rectifier tubes are generally used to supply DC power. Small, large-capacity semiconductor rectifiers are industrially available at low cost, and the alternating current included in the direct current output,
In other words, the pulsation is small, which is preferable.

A triode vacuum tube is mainly used as a high frequency oscillator. 2
The oscillator tube uses natural air cooling for high-frequency products with an output of 3 Kw or less, and forced air cooling or water cooling for larger outputs. A self-excited oscillation method is adopted as the high-frequency oscillation circuit, and various circuits are used. For example, a Hartley circuit, a Colpitts circuit, an anode tuned circuit, or a lattice tuned circuit can be used.

The Hartley circuit is relatively easy to oscillate, and is a lattice-tuned circuit.
It can oscillate at a lower frequency than an anode tuned circuit. Colpitts circuits, anode-tuned circuits, and lattice-tuned circuits are relatively easy to control to keep the oscillation frequency constant. The circuit to be adopted is determined from the viewpoints of ease of handling and maintenance, efficiency, simplicity of structure, and prevention of leakage radio waves.

Inserting various tank circuits to stabilize the frequency is also often employed.

It is important that the configuration of the load circuit 6 and matching circuit 5 is matched to the voltage required for the load circuit 6 to obtain maximum high-frequency adhesive force and to prevent radio wave interference. As the matching circuit 5, a variable capacitor type or a variel type is commonly used.

The load circuit 6 consists of an upper electrode 7 and a lower electrode 13 into which a component to be bonded by high frequency is inserted.

Depending on the purpose, the upper and lower electrodes can be driven vertically or rotationally using a press method. It is also possible to have upper and lower electrodes with a constant spacing and to allow the structure to move between the electrodes.

The metal surface has a dielectric loss of 0. OO1 or more, 002 or less,
Micas with a water absorption rate of 0.1 or less, 1μ or more and 150μ or less,
A high-frequency welding machine with a metal electrode coated with one or more inorganic electrical insulating materials selected from crystals, glasses, ceramics, metal oxides, and sulfur surfaces substantially prevents sparking! This led to the present invention.

The present invention will be explained in detail below.

In the present invention, a high frequency power source used for industrial terminology heating, usually a high frequency power source of 1 MHz or more and 100 MHz or less, is used. 1 for heating according to the Radio Law
3.5fi, 27.12, 40. 'fi8.2450M
Hz can be used, but 13.56°2 is used for high frequency adhesives.
7, 12, and 40.68 are commonly used because they provide uniform heating and a long bonding length.

In the present invention, as the metal of the electrode, aluminum, brass, copper alloys such as bronze, copper, nickel, etc. can be used.

Next, a specific inorganic electrical insulating material covering the surface of the metal electrode, which is a key point of the present invention, will be explained.

High-frequency dielectric heating is proportional to the product of the dielectric loss of the high-frequency adhesive layer, the frequency, and the square of the applied voltage. The higher the voltage, the more easily dielectric heating occurs, but on the other hand, dielectric breakdown of the bonded material occurs at high voltage, and sparks are generated.

Dielectric strength is measured as short-term dielectric breakdown strength. The test method is ASTM D], 4.9, and the unit is KV/M. In order to be able to perform high-frequency bonding without sparking, the dielectric strength of the insulating material]
OKV/ Road and top are required. It is preferable to have a dielectric strength of 15 KV/I.

The dielectric loss is measured at a frequency of 27.12 MHz using a Q meter (Model 4343B manufactured by Yokogawa Hewlett Packard). When the dielectric loss is less than 0.001, the insulating material used in the present invention is not substantially heated by high frequencies, and the heat radiation from the high frequency heating layer is significant, especially on the electrode side where the heat radiation area is large (Fig. 3). In this case, the fusion bonding on the lower electrode 13 side is insufficient, which is not preferable. If it exceeds 002, the insulating material itself used in the present invention will generate heat and may fuse with the material to be bonded, which is undesirable.

Water absorption is measured according to ASTM D570.

If the water absorption rate of the insulator 'α of the present invention exceeds 0.2%, the influence of the atmosphere in the air will be affected by the high frequency current and voltage during high frequency bonding, causing the adhesive to become uneven and causing sparks due to moisture, which is preferable. do not have.

19 of the insulating material layer of the present invention] 71 or more, 150
/l and ■ are required. Sheets with a thickness exceeding 150μ tend to have insufficient back welding or strain in the layer;
If it is less than that, the spark resistance will not be substantially improved, which is not preferable. The preferred thickness of the material is 10μ or more, 100μ
It is more preferable to have a thickness of 15 μm or less, and preferably 75 μm or less.

In the present invention, the inorganic electrical insulating material that coats the electrode surface is one selected from mica m1 crystal, glasses, ceramics, metal oxides, and sulfur having the above-mentioned dielectric loss, water absorption rate, and thickness. ”- substances are used.

mica! Examples of m include muscovite, synthetic mica, phlogopite, micalex, asbestos, and the like. Examples of glasses include borosilicate glass, lead glass, soda ash glass, and the like.

Examples of ceramics include forsterite porcelain, alumina porcelain, mullite porcelain, cordierite porcelain, and steatite porcelain, which are known as low-expansion high-frequency insulation ceramics.

As the metal oxide, alumina porcelain (85πAt2o3
, 99.5 to At203, etc.), porcelain such as zircon porcelain, beryllia porcelain, magnesia porcelain, and anodized metal plating (
Alumite processing (A4
03) Black nickel oxide (Ni2O3) or the like is used as a coating layer.

When coating a metal surface, various methods are used depending on the properties of each of the above-mentioned inorganic electrical insulating substances.

The method of forming a film by anodic plating is suitable when a metal oxide coating is desired.

A method of depositing a molten material on the surface of a metal electrode and coating it, such as a method of applying a flux to the surface of the metal electrode, is effective when forming a coating layer of glass, ceramics, sulfur, etc.

In addition, the method of bonding a pre-formed material by sintering etc. to a metal electrode using an inorganic adhesive with excellent heat resistance and durability, such as a water glass adhesive, can be applied to mica, crystal, ceramics, metal oxide, etc. 41 when forming a coating layer of an object
It is effective.

In the electrode of the present invention, by forming a covering layer of the above-mentioned specific inorganic electrical insulating material on the surface of the metal, the electrode can be made of a vinyl chloride-based copolymer or a vinylidene chloride-based copolymer. High frequency MO without causing sparks during high frequency fusion processing! It becomes possible to do so.

Furthermore, when high-frequency welding is performed using a high-frequency welding machine having the electrodes of the present invention, even better results can be obtained by interposing a spacer between the electrodes to prevent sparks. An advantage is that there is no need to use such a spacer. When using a spacer, it is necessary to select a special material for the spacer from among polymer films, sheets, etc. that have flexibility, strength, heat resistance, etc. In such a process, the spacer must be endless, and the time and effort required to intervene with the spacer becomes complicated. However, if the electrode of the present invention is used, the use of such a troublesome spacer can be eliminated. There is an advantage that it can also be done.

In addition, since the inorganic electrical insulating material coating is provided on the surface of the metal, which is difficult to deform due to stress, if the adhesive force between the inorganic electrical insulating material coating and the metal is sufficiently thick, external force can be applied to the covered electrode. In some cases, the coating has the advantage of being difficult to crack or peel off, and can be used with good durability.

By performing fusion (adhesion) using a high-frequency fusion machine with an electrode whose metal surface is coated with a film of an inorganic electrical insulating material, surface welding, back welding, and mold reproducibility can be achieved within a practical high-frequency time of 20 minutes.
Good adhesion can be achieved within ~30 seconds.

Furthermore, among the inorganic electrical insulating substances mentioned in Section 2, metal oxides are
By anodizing the metal, a very tight, void-free, and uniform coating can be obtained, which is preferable. The metal oxide layer obtained by anodic plating has a compositional structure that gradually changes from the metal surface, so the adhesive force at the interface with the metal surface coating is strong, and the metal oxide layer is difficult to peel off. Further, it is preferable that the film can be formed relatively easily no matter what shape the electrode has.

Of the metal oxides, aluminum is anodized to form γ-At20.・Those with a H2O (boehmite) coating formed (anodized) are particularly preferred because they are easy to manufacture and the coating is particularly strong.The base metal, aluminum, is also easier to cut.

By using the coated electrode for the high frequency fusion splicer of the present invention, even when a vinyl chloride copolymer or a vinylidene chloride copolymer that tends to cause sparks is used as the high frequency fusion layer, high frequency fusion can be achieved without causing sparks. Although fusion bonding can be performed, sparks can be reliably prevented by interposing a synthetic polymer film or sheet between the high-frequency adhesive and the electrode of the present invention. As such a synthetic polymer film or sheet, an aromatic thermoplastic polyester film or sheet that can be formed into a hard thin film having a melting point higher than the softening temperature or melting temperature of vinyl chloride copolymer or vinylidene chloride copolymer is preferable. An aromatic polyester film or sheet having a preferable melting point of 180° C. or higher, more preferably 200° C. or higher is preferred. As the aromatic polyester, polyethylene terephthalate is preferred. Polyethylene terephthalate is a polymer containing at least about 97% by weight of the polymer repeating ethylene terephthalate units with the remainder being a minor ester-forming component and 10% by mole of the glycol moiety. is diethylene glycol, propane-1,3-diol, butane-1,4-diol,
Polytetramethylene glycol, polyethylene glycol, 1,4-hydroxymethylcyclohexane, etc., or less than 10 mol% of the acid moiety is isophthalic acid,
Polyethylene terephthalates containing monomer units changed to dibenzoic acid, naphthalene-1,4-dicarboxylic acid or naphthalene-2,6-dicarboxylic acid, sebacic acid, adipic acid, decane-1,10-dicarboxylic acid, etc. includes.

Those containing at least about 97% by weight of repeating units of ethylene terephthalate are preferred in terms of heat distortion temperature, dielectric breakdown strength, dielectric loss, and water absorption.

Commercially available Mylar film (registered trademark, manufactured by Toshisha Co., Ltd.) has a dielectric breakdown strength of 1.4 KV/yms and a dielectric loss of 0.0.
075, water absorption rate is 001, and is preferable as a spacer.

The 7-pole for the high-frequency welding machine of the present invention is particularly useful for melting vinylidene chloride resins and vinyl chloride resins, which were difficult to perform high-frequency welding properly due to the generation of sparks in conventional high-frequency welding.
It can also be suitably used for adhesion.

As the high frequency adhesive resin, one having a dielectric loss of 0.02 or more among vinylidene chloride resin and vinyl chloride resin can be used. Preferably 004 or more, more preferably 0
．． 05 or higher is good. If the dielectric loss is less than 0.02, the high frequency dielectric heat generation will be insufficient, and the heating time will tend to be long during high frequency bonding, and the adhesive strength will tend to be impractical.

As the vinyl chloride resin preferred as the high-frequency adhesive resin, a copolymer mainly composed of vinyl chloride is preferred, and more preferably a copolymer with a functional monomer introduced therein and/or a radical initiator decomposed product by emulsion polymerization method. A copolymer with a functional group introduced therein is good.

50 mol% or more, 92 mol% as a vinyl chloride component,
A copolymer consisting of a combination of one or more of the following monomer components selected from ethylene, propylene, vinyl acetate, acrylic ester, methacrylic ester, and acrylonitrile. It is preferred because it is easy to manufacture industrially. More preferably, the functional monomer components include acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, acrylamide, methacrylic acid amide, N-n-butoxyacrylic acid amide, hydroxyethyl acrylate, and glycidyl. Acrylate, glycidyl methacrylate-1, is industrially produced and readily available, which is preferred.

In terms of high-frequency adhesive resin, preferable vinylidene chloride resin is 20 mol% or more and 93 mol%).

7 mol% or more of one or more monomers selected from monomers copolymerizable with vinylidene chloride (A) and (8), and 80 mol% or more of the monomer (B) component and (Δ) and/or O selected from functional monomers copolymerizable with (B)
It is a vinylidene chloride copolymer consisting of monomer (C) component of 12 to 10 mol% or less, and/or the polymer chain terminal polymerized by emulsion polymerization is a functional group of a radical initiator decomposition product. It is preferable to have 3°(B) (!=1. In particular, vinyl chloride, vinyl acetate, acrylonitrile, methyl acrylate-1., and methyl methacrylate are industrially mass-produced and may be used in combination.

CG) in particular acrylic acid, methacrylic acid, itaconic acid, maleic acid, maleic anhydride, fumaric acid, acrylamide, methacrylic acid amide, N-n-butquine acrylamide, hydroxyethyl acrylate, glycidyl acrylate, glycidyl meth Acrylates are preferred because they are industrially produced and readily available.

If the content of component (A) is less than 20 mol %, the amount of high frequency dielectric heat generated is small and the adhesive does not melt, soften or crosslink to the extent that practical high frequency adhesive strength can be obtained, which is not preferable. It is thought that the introduction of the functional monomer (C) works favorably when wetting with the adhesive to melt, soften, or crosslink, but the details are unknown. When the amount of functional monomer (C) introduced is 0.05 mol % or more, a clear effect of increasing high frequency adhesive strength is observed. In addition, if the functional monomer (0) is not used, if polymerization is carried out by emulsion polymerization, a functional group will be introduced at the end of the polymer chain, which is thought to be due to the decomposition product of the radical initiator, and the high-frequency adhesive strength will be improved. It is preferable.

It is convenient to use the high frequency adhesive resin in the form of latex.

Vinyl chloride, copolymer and/or vinylidene chloride copolymer latexes are used as latexes to backcoat the fabric and impart high frequency adhesion to the fabric. It goes without saying that ethylene copolymer, vinyl acetate copolymer and/or acrylic copolymer latex can be used in combination with these cylindrical frequency adhesive latexes.

A preferable vinyl chloride copolymer latex is a latex in which all vinyl chloride copolymers produced by an emulsion polymerization method containing a vinyl chloride component of 50 mol% or less and 93 mol% or less are dispersed in water. include.

The vinylidene chloride copolymer latex includes a latex in which a vinylidene chloride copolymer produced by emulsion polymerization containing a vinylidene chloride component of up to 30 moles and 95 moles π or less is dispersed in water.

Furthermore, it goes without saying that films or sheets formed from these latexes by casting or extrusion can be used as high-frequency adhesive layers. A high frequency adhesive layer formed by forming the above film or sheet can also be used.

This will be explained using spark resistance evaluation drawings. A bank coat layer 10 (high frequency adhesive layer) is provided on the back side of a nylon plain weave (fabric weight 200 to 3002/m2) as the facing material fabric 9 to a length of 10097 m by a film lamination method or a latex coating method.

A urethane foam 11 with a density of 16 to 199/l and a thickness of 10 mm is superimposed on the high frequency adhesive layer side.
A nylon nonwoven fabric 12 (IEL N1050 manufactured by Mukasei Kogyo Co., Ltd., basis weight 507/m) is superimposed on the other side of the sample as shown in FIG.

Commercially available Pearl Industries Co., Ltd. model R-203 output 3
Kw oscillation frequency 40. ．． 46M) Use an electrode with a layer formed by alumite processing to a thickness of 9/l on the surface in contact with the adhered material in both or either of the upper electrode 7 and lower electrode 13 made of Het of the high frequency oscillator 14 of Tz. did.

Note that the lower electrode 13 is heated to 110°C.

90 diameter air cylinder], 5 K9/ern
(cage pressure) and directly connected to the air cylinder 4
Visit, 30. Pressure is applied to the electrode of the tone length, and the above-mentioned laminate is bonded by high frequency using the tuning dial 30.

FIG. 8 shows a schematic cross-sectional view of a high-frequency bonded body obtained by high-frequency bonding. In FIG. 8, 20-1 is a mold part in the high-frequency bonding part, 20-2 is a front welding part in the high-frequency bonding part, and 20-3 is a back welding part in the high-frequency bonding part.

High-frequency adhesive strength (front welding strength) between the fabric 9 and the urethane foam 11, high-frequency adhesive strength (back welding strength) between the urethane foam 11 and the nylon nonwoven fabric 12, embossing reproducibility (patterning) by the upper electrode 7 on the surface of the fabric 9. ) was evaluated.

If the surface melting force and the back melting force were about the same as the breaking strength of the urethane foam 11 itself (2 to 3 K9/25 tns), it was determined to be practically acceptable. The time tl+j21t3 at which surface welding, back welding, and embossing reproducibility appear is measured, and the time at which a spark occurs (tS) is tl + t2 +t3
It was determined that the longer the length, the better the spark resistance.

Example-1 Vinyl chloride copolymer latex (Sumielite 11.300 manufactured by Sumitomo Chemical Co., Ltd.) 70 parts by weight, antimony trioxide 30 parts by weight VC thickener (acrylic alkaline thickening latex: Nippon Acrylic Co., Ltd., Brimar HA- 24
) and adjust the pH to 8 with aqueous ammonia. The viscosity of the mixture was measured using a B-type viscometer (Tokyo Keiki Special) with a rotor of 4.
It was 300,000 ps under the condition of rotation speed Fl rpm. 1009/m Matisse test coater (Swiss Warner Matthes AG Type LT S) on nylon plain weave
V) was knife coated.

As shown in FIG. 3, an upper electrode made of aluminum with a 9μ surface anodized finish, a fabric laminate, and a lower electrode made of aluminum with a 9μ surface alumite finish were arranged to evaluate spark resistance.

For comparison, the spark resistance was evaluated using aluminum upper and lower electrodes that were not anodized. As shown in Table 1, it can be seen that the high frequency well with upper and lower electrodes made of alumite processed aluminum has better spark resistance.

Table-1 Example-2 A vinylidene chloride copolymer latex with a solid content of 45% consisting of 80 moles of vinylidene chloride, 20 moles of butyl acrylate, 15 moles of hydroxyethyl acrylate, and 0.2 moles of neopentyl glycol diacrylate. The viscosity was increased in the same manner as in Example-1 using the same thickening agent. As shown in Figure 4, an upper electrode made of aluminum with a 9μ surface anodized, a fabric laminate, and a lower electrode made of aluminum whose surface was not anodized, coated on a nylon nonwoven fabric coated in the same manner as in the example. spark resistance was evaluated.

For comparison, the spark resistance was evaluated using aluminum upper and lower electrodes that were not anodized. As shown in Table 2, it can be seen that the high frequency welder equipped with an upper electrode made of alumite processed aluminum has better spark resistance.

Table 2 Example 3 70 parts by weight of vinyl chloride copolymer latex (Sumielite #1300 manufactured by Sumitomo Chemical Co., Ltd.), 30 parts by weight of ethylene-vinyl acetate copolymer (manufactured by Dainippon Ink), antimony trioxide as a flame retardant. 25 parts by weight, an acrylic alkaline thickener (Nippon Acrylic Co., Ltd. Brimar HA, -2) as a thickener.
4) to which 1 part by weight was added was adjusted to pH with aqueous ammonia.
Adjusted to 8.

This mixture was applied to fabric to evaluate spark resistance.

For evaluation of spark resistance, a high frequency well was used, as shown in FIG. 5, in which only the lower electrode was provided with an aluminum electrode pressurized with alumite.

t, -4, ahead, = 6, t, 3 = 8, t8 = 1
2 seconds, demonstrating practical spark resistance.

Example-4 Vinylidene chloride copolymer latex (Mudaisei χ-10
2) A formulation consisting of 100 parts by weight and 2 parts by weight of the same thickener described in Example-3 was adjusted to pH 8 and applied to the fabric using the same coating method as in Example-1 to a coating thickness of 50 y/m2. Then, a mixture consisting of 100 parts by weight of acrylic copolymer latex (Asahi Kaseiso Polytron E-800), 35 parts by weight of antimony trioxide, and 2 parts by weight of the above-mentioned thickener was adjusted to 1]H8, and the above-mentioned As shown in FIG. 6, the coating was applied to the coated surface of the sample in layers.

As shown in Figure 7, a fabric laminate is inserted between the upper and lower anodized aluminum electrodes, and a 25μ polyester film (East Mylar) is inserted between the lower electrode and the lower side of the fabric laminate. Spark resistance was evaluated.

t, -5, 1i2=R, j3= 9, t8= 1
8 seconds, indicating spark resistance.

The effects of the high-frequency welder of the present invention can be summarized as follows: (1) Coating of fabric that is difficult to twist and has high-frequency adhesive properties;
This is a device that can perform high-frequency bonding of polished surfaces without generating sparks.

(2) It is a high-frequency welder that can perform high-frequency bonding in a short time without generating sparks.

(3) Since sparks are not generated, the finished appearance of the assembled product is good.

(4) The yield of assembled products is improved.

[Brief explanation of drawings]

Figure 1 is a block diagram of a high-frequency welder circuit, Figure 2 is a circuit diagram showing an example of a high-frequency welder circuit, and Figure 3 is a high-frequency welder with upper and lower electrodes coated with an inorganic electrical insulating material. FIG. 4 is a schematic sectional view showing a high-frequency welder and a high-frequency bonded body having an electrode in which only the upper electrode is covered with an inorganic electrical insulating material, and FIG. 5 is a schematic cross-sectional view showing a high-frequency bonded body with only the lower electrode covered. A schematic cross-sectional view of paulownia showing a high-frequency well with an electrode coated with an inorganic electrical insulating material and a high-frequency adhesive; Figure 6 is a cross-sectional view showing a fabric laminate as a high-frequency adhesive; Figure 7 is a polyester film. A schematic cross-sectional diagram showing the welding configuration of the high-frequency welder in which the
FIG. 8 is a schematic cross-sectional view of the high-frequency bonded body. DESCRIPTION OF SYMBOLS 1...Low frequency low voltage power receiving circuit, 2...Low frequency high voltage circuit, 3...DC high voltage circuit, 4...High voltage oscillation circuit, 5...Matching circuit, 6... - Load circuit, 7... Upper electrode, 8... Inorganic electrical insulating material, 9... Surface phase fabric, 10... Back coat layer, 10' - Acrylic on vinylidene chloride copolymer blend coating layer 11... Urethane foam, 12... Nylon nonwoven fabric, 13... Lower 'electrode, 14... High frequency oscillator, 15... Vinylidene chloride based copolymer blend. coat layer,
16 - Acrylic copolymer blend coating layer, 17...
Polyester film, 18...High frequency cross EA. 19...Empire high cross, 20...High frequency adhesive part, 20-1... Embossing reproduction part, 2o-2... Front fusion part, 20-3... Back fusion part. Applicant Asahi Kasei Kogyo Co., Ltd. Agent Yoshio Toyoguchi Figure 1, Continued Amendment September 1980 28th Patent Office Commissioner Kazuo Wakasugi 1.11 Indication Patent Application No. 72141/1983 2. Name of the invention Electrode for high frequency fusion machine 3. Person making the correction 1. Relationship with the matter Patent applicant 1-2-6 Dojimahama, Kita-ku, Osaka-shi, Osaka (003) President and Representative Director of Asahi Kasei Industries, Ltd. Teru Miyazaki 4, Representative Chiyo, Tokyo [204 Nishin Building, 1-4-1 Yurakucho, H-ku
Room No. 501-21385, "Detailed Description of the Invention" column 6 of the specification to be amended, contents of the amendment (1) Description section, page 25, lines 7 to 8, "Blymarl HA-24J" Corrected to ``Blymar ASE-80J.'' (2) ``Blymar HA'' on page 27, line 5 from the bottom of the circular.
-24J is corrected as ``Blymar ASE-80J.

Claims (2)

[Claims] (1) The surface of the metal has a dielectric loss of 0.001 or more, 0
．． 1 selected from micas, crystals, glasses, ceramics, metal oxides, and sulfur with a water absorption rate of 0.02 or less and a water absorption rate of 0.01% or less
1. An electrode for a high-frequency fusion splicer, characterized in that the electrode is coated with an inorganic electrical insulating material having a thickness of 1μ or more and 150μ or less. (2) The electrode for a high-frequency fusion splicer according to claim 1, wherein the metal is aluminum and the inorganic electrical insulating material is alumina.