KR910009639B1 - Anti-explosion tape for brown tube the method of making the same - Google Patents

Abstract

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Description

Explosion-proof tape for CRT and method of forming static elimination circuit of CRT

1 is a schematic explanatory diagram showing a state in which the CRT is explosion-proof using the explosion-proof tape of the present invention.

2 is a cross-sectional view showing a state before performing an explosion-proof treatment.

3 is a partially enlarged cross-sectional view showing a state in which the explosion-proof treatment of the CRT is performed using the explosion-proof tape of the present invention.

* Explanation of symbols for the main parts of the drawings

1: Pressing band 2: Adhesive tape

3: Braun tube 4, 5: Pressure-sensitive adhesive

6: base material 7: conductive particles

The present invention relates to an explosion-proof tape for CRT and a method of forming a circuit for removing the static electricity generated at the outer edge of the CRT as well as the explosion-proof treatment of the CRT. The binding band heated on the adhesive tape in which the inorganic conductive material wound around the maximum outer circumference of the CRT is buried, and the organic fluid component in the adhesive layer is fluidized by the heat and pressure of the band so that the inorganic conductive material contacts the band and the CRT surface. The present invention relates to a method of forming an electrostatic elimination circuit of a CRT exhibiting an explosion-proof and conductive effect.

The CRT used for a conventional TV or display needs to apply an extremely high voltage for the purpose of forming an image, and static electricity is generated and easily accumulated on the outer edge of the CRT.

In recent years, with the expansion of the use of TVs and the like, there is an increase in the chances of not only watching, but touching the hands directly, and this static electricity often causes a danger to the human body. In addition, there have been cases of hunting of static image quality due to static electricity and extreme disturbance of images.

Various methods for removing the static electricity exhibiting such disadvantages have been attempted. However, due to structural constraints such as televisions, earth circuits in which static electricity accumulated by applying graphite or conductive paint on the outer edge of the CRT are stored in a cabinet or the like through a fastening band. It is common to ground at.

The fastening band is used to prevent the deflation caused by the impact of the CRT which is in a high vacuum state, and the effective transmission of the fastening pressure of the band and the band directly contact the glass surface cause local defects such as grooves. In order to prevent it from being necessary, a highly insulating adhesive tape needs to be adhered between the glass and the band, and the method of removing the static electricity had to be performed by a separate process from explosion proofing.

Such a method is, for example, a method of adhering a conductive tape in which copper or aluminum is used as the base material and blending the fine powder in the adhesive so that the band / glass contacts the corners of the CRT. Depending on the method, the effect was different or peeled off to be completely useless, or part or all of it was peeled off and contacted the circuits in the cabinet, causing serious breakdowns, and requiring great attention to assembly.

SUMMARY OF THE INVENTION The present invention has reached the result of intensive attention and research to solve the above-mentioned drawbacks, and achieves the above-mentioned objects extremely surely and inexpensively.

The principle of the present invention is to effectively utilize the heat and pressure of the fastening band and the function of the adhesive tape (explosion proof tape), which is a breakthrough that does not require any change or addition to the current process.

The present invention is an explosion-proof tape for a brown tube made of an adhesive tape having at least one per cm ² in terms of a dispersion amount of conductive particles having a diameter in the range of 25 μm to 300 μm in the adhesive layer, and a maximum outer diameter portion of the brown tube or In the vicinity of the adhesive layer, the conductive particles having a diameter in the range of 25 μm to 300 μm are used as the dispersion amount, and the adhesive tape having at least one per 1 cm ² is wound and adhered or partially adhered to the tape. Explosion-proof reinforcement treatment, characterized in that the fastening of the band heated to more than 120 ℃ on the back of the method of forming a static electricity removing circuit of the CRT.

The present invention is described in detail as follows. The fastening band is designed to generate a high fastening force by heating an extremely high tensile metal band to prevent the deflation of the CRT in a vacuum state and using the shrinkage force as well.

Fastening force of the band is not constant but depending on the structure of the cathode-ray tube design or bands, generally corner portions (four corners) 30kg / cm ² or more and is in 1-10kg / cm ² on a flat portion of the surroundings.

In addition, greater pressure is applied to partial protrusions and stepped portions such as molds and latch lines. The pressure-sensitive adhesive layer directly subjected to the pressure of the fastening band is composed of a pressure-sensitive adhesive layer and a base material, and is wound or partially adhered to the outside of the CRT in the form of an adhesive tape, and a fastening band is covered thereon.

At this time, the adhesive layer is melted or softened by the heat of the band, the adhesive and the pressure-sensitive adhesive of the organic component flows to the equilibrium with the pressure of the band to exhibit an adhesive fixing effect.

This equilibrium varies depending on the location, but in the base material such as glass cross, the thickness equivalent to the diameter of the glass fiber used is vulcanized at corners where particularly strong pressure is applied, and in the base material such as polyester film. In this case, the particle diameters of the filler contained in the adhesive and the anti-slip component are equivalent thereto.

The present invention utilizes this phenomenon to immerse the inorganic conductive material in the adhesive layer so that the resistance value between the glass and the band is removed by static heat and pressure, that is, the resistance value of the pressure-sensitive adhesive layer after pressing the band is 10 ⁴ kPa or less. It is.

That is, according to the present invention, the pressure-sensitive adhesive tape containing one or more conductive powders per 1 cm ² is wound around or partially adhered to or near the maximum outer diameter portion of the CRT, and the pressure band is fastened to perform explosion-proof treatment. At this time, the flow component in the adhesive tape flows due to the heat pressure of the pressure band, and the conductive material such as the metal powder contains a slow flow rate, so that the portion directly below the pressure band has a high density of the conductive material and the conductive materials are in contact with each other. In addition, since the same state is applied to the surface of the band or the CRT as it approaches, the resistance is sufficient to transfer the static electricity from the glass surface to the band, that is, 10 ⁴ kPa or less in principle.

The equivalent dispersion amount here is a numerical value derived from the largest distributed particle diameter of the conductive material powder to be used, and is calculated by the following formula.

The present invention will be described with reference to the drawings, in which Fig. 1 is a cross-sectional view of a CRT tube subjected to an explosion proof treatment, in which (1) shows a press band, (2) shows an adhesive tape of the present invention and (3) shows a CRT tube.

FIG. 2 is an enlarged view before fastening the pressure band of FIG. 1. (4) and (5) are pressure-sensitive adhesives such as synthetic resins mainly composed of acrylic acid ester copolymers or rubber-based rubbers mainly composed of natural rubber, epoxy resins or poly Thermosetting resins such as ester resins or thermoplastic resins such as polyethylene or ethylene vinyl acetate copolymers, these resins are used alone or in combination, and the coating impregnation amount is used in the range of 50 g / m ² to 600 g / m ² . (6) is a base material such as fiber cloth such as glass cloth, rayon, cotton cloth or polyester film, and the like, and is selected in the range of 50 μm to 400 μm according to the design of the CRT, but FIG. 2 is a drawing when glass cloth is used. .

(7) is a conductive material such as metal powder or carbon powder of iron, copper aluminum, nickel and alloys thereof contained in the adhesive tape, the particle diameter of the powder is 300 µm or less, and the main component distribution particle diameter is 25 µm. The thing within the range of -300 micrometers can be used.

When the main component particle size distribution is 25 µm or less, it is necessary to use an extremely large amount in order to exhibit the effect of the present invention, and disadvantages in characteristics such as disadvantages in cost and deterioration of adhesive properties due to opposing injection occur. do.

In addition, when particles having a diameter of 300 µm or less are used, anxiety factors such as scratching the surface of the CRT can be generated when the particles are locally subjected to pressure in the pressure band.

When the amount of the powder is added in an amount of one or more in an annular dispersion amount per 1 cm ² of the adhesive tape surface area, when the amount is 10 ⁵ or more, disadvantages such as cost or deterioration of properties occur.

FIG. 3 is an enlarged view of the use state of the explosion-proof tape of the present invention, in which the pressure band 1 is heated to 120 ° C. or more to ignite or melt the pressure-sensitive adhesive tape layer 2, and cools while flowing the pressure-sensitive adhesive portion 1 kg / cm ^2. The above pressure is applied, and the metal particles 7 are stopped or further approached at the same position as the mutual contact state (a) or effective access state (b), and the interlayer resistance of the adhesive tape is 10 ⁴ kPa or less. And resistance sufficient to transfer the static electricity of the CRT surface to the band.

One at the time of explosion-proof band processing force is different depending on the structure of the design and a band of the cathode-ray tube, in general, 30kg / cm ² or more in the corner of the four places, and Chang, in the short-side portion since the 1-10kg / cm ² As a pressure which shows the resistance value of this invention, it is enough.

The method for producing a pressure-sensitive adhesive tape of the present invention is a method of dispersing particles of a calculated amount in a woven fabric or a film treatment agent, dipping, drying, and then applying or impregnating an adhesive with a roll coater to wind the paper tube or at least one component of the adhesive. There are a method of dispersing particles of a calculated amount and impregnating with a reverse cord or the like and winding the paper tube, and a method of dispersing the particles on the surface of the adhesive with a metering dispenser immediately before winding the adhesive tape or at a slit, and immersing them in a pressure roller.

As described above, the CRT tube subjected to the explosion-proof treatment using the tape of the present invention can be grounded by easily forming a pressure band in the static electricity generated at the outer edge part, and is safe and can be added or modified in the manufacturing process. It is extremely useful without the need.

Examples of the present invention are shown below, but the present invention is not limited to these examples.

Example 1

Aminosilane treatment was performed on the surface of a plain weave glass cloth with a thickness of 0.18 mm and a weaving density of 3 minutes / 25 mm in an inclined direction (number of yarns # 150) and 25 minutes / 25 mm in a weft direction (four variables: # 75). Ethylene-acrylic acid copolymer resin (MI = 4, acrylic acid content 8%) of softening point 85 ° C., a heat-melting adhesive, was melted at 350 ° C. on one side of the cross and extruded to an adhesion amount of 60 g / m ² by an extruder and laminated to glass cross. It was.

Injector diameter distribution on the opposite side of the laminate cross with a specific gravity 7.86 electrical resistance of 9.8 × 10 ^-8 μm-m and a particle diameter of 105 μm (145 mesh) in a pressure-sensitive adhesive formulation (35% solids) mainly composed of methacrylate ester. Iron powder was mixed 0.8% by volume ratio with respect to the pressure-sensitive adhesive formulation, and applied and dried to a coating amount 115g / m ² with a roll coder to prepare a CRT tube of 386.6 pieces / cm ² in terms of iron powder dispersion.

The general characteristics of this adhesive tape are shown in Table 1. The tape was cut to 45 mm in width and wound around the maximum outer diameter of the 29-color CRT tube. The iron band was heated to 500 ° C. Evaluation of the interlayer resistance value of the adhesive tape and the explosion-proof performance of the CRT. The results are shown in Table 1.

Example 2

On both sides of a 0.75 mm thick polyester film, a particle diameter of 75 μ (about 200 mesh) and a specific gravity 8.85 electrical resistance of 7.24 × 10 ⁸ Ω-m nickel powder were applied together with vinylidene chloride to give a surface of about 50 / m. The subtreatment was carried out so as to have an adhesion amount of ² . The nickel powder dispersion amount of this heat treatment film was 1279.2 pieces / cm ² .

On both sides of this treating agent polyester tape, a rubber adhesive made of a natural rubber and a tackifying resin filler was applied and dried by a dip method so as to be 70 g / m ² , respectively, and wound together with a release paper to prepare a tape for CRT.

The pressure-sensitive adhesive tape was cut to a width of 45 mm and subjected to explosion-proof treatment using the tape under the same conditions in the same CRT as in Example 1. This result showed extremely satisfactory results as shown in Table 1.

Example 3

Thickness of 0.24mm and weaving density of vinyl cloth is applied to the surface of the solid glass cross of 16 yarns / 25mm in the warp direction and 16 yarns / 25mm in the latitude direction. Ethylene vinyl acetate copolymer resin (vinyl acetate content: 10 wt%) having a softening point of 95 ° C. was melted at 400 ° C., extruded to 65 g / m ² using an extruder, and laminated to glass cross. A rubber-based adhesive made of natural rubber and a tackifying resin is applied to the half surface of the laminate cross using a calender so that the coating amount is 160 g / m ² , and the surface of the adhesive has a particle diameter of 210 μm and a specific gravity of 2.69 electric resistance of 2.75. × 10 ^-8 Ω-m of the aluminum powder, the amount distributor to 25g / m ² of dispersed so that 5kg / cm ² by taking a pressure roller immersed volume of the tube the dispersion of aluminum powder also 1991.8 dog / cm ² CRT tape Got.

The tape was cut to 45 mm width and tested in the same manner as in Example 1. The results are shown in Table 1.

Example 4

The resin powder of Example 1 was coated with an ethylene acrylic acid copolymer resin having a specific gravity of 8.85, an electrical resistance of 1.72 × 10 ⁻⁸ μm-m, and a 290 μm particle diameter distribution of the main component on the opposite side of the laminated glass cloth. 0.1 volume% was mixed with the adhesive formulation (33% of solids), and it applied and dried so that the adhesion amount might be 85 g / m <^2> with a reverse | coating machine, and the CRT tape of 1.97 piece / cm <^2> converted copper powder was produced. The test of this tape was carried out in the same manner as in Example 1 and the results are shown in Table 1.

Example 5

Epoxy resin (bisfenol) blended with a diamide, which is coated on one side of a 0.75mm thick polyester film, with a rubber-based adhesive formulation made of natural rubber, a tackifying resin, and a filler so as to have an adhesion amount of 70 g / m ² . Type A: Epoxy equivalent weight of 285), specific gravity of 10.5 electrical resistance 1.62 × 10 ^-8 주입, injector diameter distribution of 150μ silver powder mixed with 0.9 parts by weight to 100 parts by weight of epoxy compound 25g by hot melt coater heated to 75 ℃ / m is applied to taking books with a release paper so that the ^second silver powder is also dispersed to obtain a CRT of 1.21 tape pieces / cm ^2. The test of this tape was carried out in the same manner as in Example 1 and the results are shown in Table 1.

TABLE 1

1) 1808 Seal Method (300mm / min: 23 ℃)

2) 80 ° sealing method (300mm / min: 23 ℃) after pressing test specimen to 300 ℃ × 10 seconds

3) Shearing force after inserting a tape between sus / sus and pressing force at 300 ℃ × 10 seconds (50mm / min: 23 ℃)

4) Resistance of copper foil when copper foil is applied to the front and back of the tape and fixed with tape on the surface of 50 mm ø iron and pressurized at 300 ° C x 5 kg / cm ² with the tape side upright.

5) Attach the tape of 25 × 25mm to the cutting surface of tapered block where the center part of the 25mm × 25mm angle is 70mm divided into 5 ° angles, and the upper block is heated to 300 ℃ and the load is pressurized by 10kg. Time to fall by slip of tape of upper block in state.

6) Maximum sliding distance when 120 kg / 30 load is applied to a CRT tube fixed at 70 ° C for 30 minutes.

7) The crack that passed through the band part of the crack that occurs when 500g of the ball is dropped at the height of 1.5m from the front of the CRT.

8) Resistance value between the copper foil / copper foil after bending by fixing copper foil on the same part of the copper foil after attaching and sticking copper foil to the edge of a square and a base part in explosion-proof processing.

Claims (2)

Explosion-proof tape for CRT tube which consists of adhesive tape (2) which has at least 1 per cm <^2> in the amount of conversion of the electroconductive particle (7) which has a diameter within the range of 25 micrometers-300 micrometers in an adhesive layer. An adhesive tape having cathode-ray tube (3) up to the outer diameter or the amount of dispersion in terms of the conductive particles 7 having a diameter in the range of 300㎛ 25㎛ to the pressure-sensitive adhesive layer in the vicinity of at least 1cm ^2, at least one per (2) A method of forming an electrostatic elimination circuit of a CRT as well as explosion-proof reinforcing treatment, characterized in that the back side of the tape (2) is fastened with a band (1) heated at 120 ° C. or more after winding or partially gluing.

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