JPS5834881A - Preventing explosion of cathode ray tube by using adhesive tape with high shear strength - Google Patents

Abstract

PURPOSE:To provide the titled adhesive tape suitable for application to the conical surface of a cathode ray tube, prepared by forming a specified adhesive layer containing a granular inorganic substance, on both sides of a flexible base sheet. CONSTITUTION:The adhesive tape 5 is prepared by forming an adhesive layer 1, 3 consisting of an adhesive (e.g., natural rubber adhesive) which contains 5- 150pts.wt. (per 100pts.wt. adhesive by solid) particles of an inorganic substance 4 having a diameter of 125mu or smaller, with 50mu particles accounting for a major portion in the particle size distribution (e.g., silicon oxide powder or glass beads) on both sides of a flexible base sheet 2 of about 25-125mu thick (e.g., Japanese paper or polyester film).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an explosion-proof method using an adhesive tape with high shear resistance that is wound between a cathode ray tube, particularly a conical surface thereof, when a firing frame is fitted thereto.
Regarding.

The applicant is Pla? He invented a method of reinforcing cathode ray tubes by applying a specified adhesive tape to the maximum diameter 11 of the Y-tube and fitting a heated tightening band thereon. -8779 Not fully opened). Reinforcing the maximum diameter part #C of the cathode ray tube by applying the above-mentioned reinforcement method can be achieved by the above-mentioned invention, but it is possible to strengthen the maximum diameter part #C of the cathode ray tube by applying the above-mentioned reinforcement method. If you do not try to reinforce it (with a tightening band),
A component of the clamping force is generated in the axial direction of the cathode ray tube, the above component force is applied to the adhesive tape, a shearing force is generated in the adhesive of the adhesive tape, and the adhesive flows due to the shearing force, causing distortion. Due to this problem, the tightening cannot be performed sufficiently, and there is insufficient reinforcement.
There was an IA shortcoming.

As a result of research into adhesives to remedy the above-mentioned drawbacks, the present applicant discovered that the longer the length of the adhesive in the direction in which shearing force is applied, the greater the amount of distortion. On the other hand, the sheet-like base material used for the above purpose is polyester.

PVC, polyethylene, nylon, and other high-molecular compound fibers, Japanese paper, tatami paper, etc. are suitable), and metal sheets such as aluminum and steel foil are cost-effective. Glass cloth, cotton cloth, etc. are more unsuitable), and glass cloth and cotton cloth are at the threshold of performance), and there is a risk of damaging the glass of the cathode ray tube. Yo),
The length of the adhesive can be shortened by applying it in the direction of shearing force without losing the adhesion and fast-acting properties of the adhesive, resulting in less distortion.
In addition, we succeeded in increasing the shear resistance to a large FC+.

When this is wrapped around a cone-shaped TMK tube and heated from above, the band is contracted and fitted, a part of the inorganic particles in the adhesive will dig into the base material. When anchored, the anti-shearing force becomes even greater.

The thickness of the film base material or paper base material is selected in the range of 25μ to 125μ depending on the design of the cathode ray tube. It is preferable that the paper base material be relatively thin and relatively thick for one paper base material.

The adhesive used in the present invention is mainly composed of a rubber adhesive made of natural rubber or synthetic rubber with a tackifier added, or a resin adhesive made of mostyl acrylate copolymer. Inorganic particulates, i.e., silicon oxide, aluminum oxide, titanium oxide, zinc oxide, iron oxide, iron powder and copper powder, aluminum powder, or Glass beads are mixed alone or in the form of mixtures and combinations, and at least the adhesive layer on the glass side of the cathode ray tube has sufficient adhesion to the glass surface, and the adhesive layer on the band side is equal to or lower than that on the glass surface. Therefore, the amount of inorganic particulate added to the band-facing surface and the glass-facing surface may be different.

The particle diameter of the inorganic particulates mixed into the adhesive is 125μ or less, and the main particle size distribution is around 50μ, and the hardness is equivalent to that of cathode ray tube glass.
It is preferable that the hardness is lower than that.

When the content of granules is 5 parts by weight or less.

The adhesive's ability to prevent cold flow is significantly reduced, resulting in a reduction in shear resistance. If the amount exceeds 125 parts by weight, the effect of increasing shear resistance is not so noticeable, and it becomes difficult to form a thin adhesive layer.

What is the particle size of the inorganic particulate matter mixed in as described above?

This correlates with the thickness of the base material being used, but if the particle size is smaller than 50 μm, the amount of penetration of each particle into the base material is insufficient, and the anchoring force of the granular particles is effective. Dena (nashi, therefore, the shear resistance cannot be exhibited, this is 125
If the particle size is larger than μ, there is a risk of breaking through the base material and damaging the glass surface.

To manufacture the adhesive tape according to the present invention.

Either apply the above-mentioned pressure-sensitive adhesive solution to both sides of the base material simultaneously using a dip coater, dry it, and roll it up together with the #forming agent, or use a roll coater, reverse coater, etc. to twist it onto both sides of the base material. Apply the mixed solution separately and dry.

It is produced by winding it up directly or together with release paper and cutting it to the desired width.

Examples of the adhesive tape of the present invention and its application will be described in detail with reference to the drawings. FIG. 1 is a sectional view of the adhesive tape 5 obtained as described above.

Reference numeral 2 indicates a sheet base material, on both sides of which adhesive layers 1 and 3 mixed with inorganic particulate matter 4 are applied as described above.
Ru.

This adhesive tape 5 is as shown in FIG.

It is pasted and wound around the conical surface 6 on the outside of the cathode ray tube.

Then, it is shrink-fitted with a heated metal band 7 and pressurized from the outside. At this time, the adhesive layers 1 and 3 facing the glass surface 6 and the band surface 7 are pressurized, and the inorganic particles 4 contained in the layers 1 and 3 are transferred to the sheet base material 2 by the pressure of the band 7.
As shown in Figure 3 (enlarged), the anchor was anchored, and there was a misalignment between the base material 2 and the adhesive layer 1.

To prevent the glass surface 6 from shifting from the metal band 7.

While exhibiting shear resistance, the frictional force of the two particles at the interface I between the metal band 7 and the adhesive tape 5 and the interface between the glass surface 6 and the adhesive tape 5 provides a fixing performance superior to that of conventional adhesive tapes. Demonstrate.

It is not only clear from the above explanation that the method of adhering cathode ray tube glass and metal bands using the adhesive tape according to the present invention is an extremely effective means for explosion-proofing between glass and metal on a conical surface. In the event that the glass cracks or explodes, the pieces of glass will not fly off because they are glued to the adhesive chip, preventing danger and preventing damage to the glass wall of the cathode ray tube. It also has the advantage that it can be made thinner and a lighter cathode ray tube can be manufactured.

Application examples of the present invention will be described below, but it goes without saying that the present invention is not limited to these application examples.

Application example 1 Silicon oxide with a maximum distribution particle size of 50μ and a maximum particle size of 125μ or less is added to a natural rubber adhesive in a 33% toluene solution.
Mix parts by weight to prepare an adhesive solution with a viscosity of 9.800 pps/25°C.
It was coated on both sides of a μ polyester film base material using a dip coater so that the thickness after drying was 65 μm on each side, and after drying, it was rolled up together with a release paper.

Table 1 shows the results of measuring the adhesive properties and slippage properties when this adhesive tape was cut to a width of 16wR1c and wound.
jC is shown.

Furthermore, this tape was wound around the outside of the conical surface forming the apex angle 10 of a 1.2 inch (36.36 crn) color cathode ray tube.
Width 13 with a length equal to the outer circumference of the next part
A stainless steel band with a diameter of 1.5 mm was heated to about 500° C. and fitted, and 30 minutes later, the shift was observed, but no shift was observed.

Application example 2 The same adhesive solution containing granules as in application example 1 was applied to a thickness of 12
It was coated on both sides of a 5μ Japanese paper tape base material using a dip coater and dried to give a finished thickness of 300μ.

This adhesive tape was then wound up together with release paper.

Its adhesive properties and shear properties are shown in Table 1.

Furthermore, this adhesive tape was coated with Bg 1 /
) After cutting into vm, this was wound outside the conical surface of the same cathode ray tube as in the first application example, and banding was performed with the same band, and no deviation of the band from the center of the glass surface was observed.

Application example 3 Iron powder with a maximum distribution particle size of 50 μm and a maximum particle size of 75 μm or less was mixed into an acrylic adhesive with a 33% (33%) toluene/ethyl acetate mixed solution at a solid content ratio of 5% by weight to obtain a viscosity of 5.900. a
PE liquid A formulation.

Next, similar iron powder was mixed in at a viscosity of 21.0% by weight.
000 cpa of liquid B was prepared, and first, liquid A was coated on one side of a 75 μm thick polyester film base material using a roll coater so that the thickness after drying was 50 μm.

On the opposite side, liquid B was applied and dried in the same manner so as to have a thickness of 100 μm, and the tape was rolled up together with a release paper and cut to a width of 16IlEI11 to obtain an adhesive tape. The adhesive properties and shear properties of this adhesive tape are as shown in Table 1.

Next, as in Application Examples 1 and 2, this adhesive tape was applied to the conical surface of the outer surface of the cathode ray tube at -1 level at the A liquid level, and banding was performed on this with the above-mentioned band, but no deviation occurred.

Comparative Example 1 In Application Example 3, instead of using liquid A, an acrylic adhesive containing no iron powder and having a viscosity of 3.0000'9B was used in a 75μ thick film so that the dry thickness would be 45μ. Coat it on a polyester film base material with a roll coater and dry it.For the opposite side IC, apply the above-mentioned B liquid composition to a thickness of 100μ, dry it, roll it up with a release agent, and cut it into 16cm width. Comparative adhesive tapes having the properties shown in Table 1 were prepared.

This adhesive tape was used under the same conditions as Application Example 3.

When banding was done on the conical surface of a cathode ray tube,
The maximum deviation after 30 minutes was 10.

From this comparative example, results sufficient to prove the explosion-proof effect of the cathode ray tube according to the tape of the present invention were obtained.

Note 1: For application examples 1 and 2, A is for both the front and back.

Application Example 6 is the A liquid surface, and Comparative Example 1 is the adhesive surface that does not contain particles.

Note 2: Cross section at angle 5 is 2.5 crn x 2.5 cm
A full load of 20 Kf was applied to the no-pur block, and a deviation of 10 degrees occurred at the probe temperature shown in each table.

Note 3: Grasp the corner of the mounting band and consider a temperature change of -45°C for 5 hours and +80°C for 5 hours as one cycle %1
The amount of deviation at the maximum deviation part after 0 cycles.

Note 4: Maximum amount of deviation when gripping the corner of the mounting band and applying a ring-shaped load of 120 kg for 30 minutes with the front of the cathode ray tube facing down.

Note 5: Amount of deviation when a stainless steel band heated to 500°C is fitted onto the tape surface and 30 minutes have elapsed.

From Table 1 above, it is understood that the adhesive tape according to the present invention exhibits shear resistance due to the pressure IC, and that a cathode ray tube wound with this tape exhibits a sufficient explosion-proof effect.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional side view of the adhesive tape used in the present invention;
Figure 2 shows a reinforcing pan for a cathode ray tube.The adhesive tape shown in Figure 1 is wrapped around the conical glass surface of the pan, and the L (side cross-sectional view of the metal band frame fitted) is shown in Figure 3. It is a partially enlarged view. 1.3... Adhesive layer, 2... Tape base material, 4...
Inorganic granules, 6... Conical glass of cathode ray tubes. 7...Metal band. Applicant Teraoka Seisakusho Co., Ltd. Procedural Amendment October 1982 2B Commissioner of the Japan Patent Office Shima 1) Haru Judono 1, 4r Display 1981 Patent Application No. 131494 @ 2 Name of the Invention Great Shear Resistant Braun Tube Explosion-proof adhesive tape 3 Relationship with the case of the person making the amendment Patent applicant 17 1-4-22 Hiromachi, Parts Ward, Tokyo Name: Kimon Seisakusho Co., Ltd. 4 Agent address: 3-chome Kojimachi, Chiyoda-ku, Tokyo 102 3rd address=
1-・Bellmode Building 60Q Telephone (LJi: Ri(
151'A8, Contents of the amendment The title of the invention in the application and specification is amended to "adhesive tape for explosion-proof cathode ray tubes with high shear resistance." (2. It is amended to attach the entire specification including the claims. Applicant: Teraoka Seisakusho Co., Ltd. (corrected the entire text) Description 1. Name of the invention: Shear-resistant adhesive tape for large cathode ray tube explosion-proof 2. Claims: 5 to 150 parts by weight of inorganic granules having a particle diameter of 125 μ or less and having a king distribution of 50 μ particles are mixed on both sides of a flexible substrate with a thickness of about 25 μ to 125 μ. Shear resistance large 3 in which the adhesive layer is formed to a thickness of about 50μ or more
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cathode ray tube, particularly to an explosion-proof adhesive f-bond for a cathode ray tube with high shear resistance, which is wound between the conical surface of the cathode ray tube when the frame is fitted onto the conical surface of the cathode ray tube. He invented an explosion-proof adhesive tape for cathode ray tubes that fits a predetermined tightening band on the largest diameter part of the cathode ray tube, and filed a patent application (Japanese Patent Application No. 8779/1987, unpublished). However, although it is possible to perform the above-mentioned reinforcement at the maximum diameter portion of the cathode ray tube by the above-mentioned invention,
If you try to reinforce the conical part of the cathode ray tube with a tightening band behind the maximum diameter part, a component of the tightening force will be generated in the axial direction of the cathode ray tube, a component of the adhesive tape will be applied, and the adhesive will become sticky. A shearing force is generated in the adhesive mold of the tape, and the adhesive flows due to the shearing force, causing distortion, which makes it impossible to tighten the tape sufficiently and to provide sufficient reinforcement. In order to improve the above-mentioned drawbacks, the applicant researched adhesives used in adhesive tapes for explosion-proof cathode ray tubes, and found that the longer the length of the adhesive in the direction of shearing force, the greater the amount of distortion. I discovered that it grows. On the other hand, the sheet-like base material of the adhesive tape used for the above purpose is a film made of a polymer compound such as polyester, vinyl chloride, polyethylene, or nylon. Papers such as Japanese paper and rayon paper are suitable; metal sheets such as aluminum foil and copper foil are unsuitable due to cost considerations; glass cloth and cotton cloth have poor tensile performance; This is inappropriate as he is used to In view of these points, 1. In the present invention, by mixing an appropriate amount of inorganic particulate matter with an appropriate particle size into the adhesive to be coated on a film or Japanese paper, it is possible to improve the adhesive properties and fast-acting properties of the adhesive. By shortening the length of the adhesive in the direction of shearing force without losing its properties, we succeeded in obtaining an explosion-proof adhesive tape for cathode ray tubes with a low amount of distortion and high shear resistance. When the inorganic particles in the adhesive are wrapped around the conical surface of the adhesive and contracted and fitted onto the heated band, a portion of the inorganic particles in the adhesive sink into the base material and become anchored. The shearing force becomes even greater. The thickness of the film base material or paper base material is selected in the range of 25μ to 125μ depending on the design of the cathode ray tube. It is preferable that the paper base material be relatively thin and relatively thick for a single paper base material. The adhesive used in the present invention is mainly composed of a rubber adhesive prepared by adding a tackifier to natural rubber or synthetic rubber, or a resin adhesive made of acrylic acid ester copolymer. Inorganic particulates in the range of 5 parts by weight to 125 parts by weight based on the solid content, that is, oxidized iron, aluminum oxide, titanium oxide, zinc oxide, iron oxide, iron powder and copper powder,
Alkaline powder or glass peas are mixed alone or in the form of mixtures and combinations, and at least the adhesive layer on the glass side of the cathode ray tube has sufficient adhesion to the glass surface, and the adhesive layer on the band side is equivalent to the glass surface. Since the adhesion strength may be greater than or equal to or less than that, the amount of the inorganic particulate matter added to the band-facing surface and the glass-facing surface may be different. The particle size of the inorganic particles mixed in the adhesive is 125〃 or less, and the particle size distribution is a King's distribution around 50μ, and its hardness is equal to or lower than that of cathode ray tube glass. It is preferable that When the content of granules is 5 parts by weight or less. The adhesive's ability to prevent cold flow is significantly reduced, and its shear resistance is reduced. Also, 125
When it comes to parts by weight or more. The effect of increasing shear resistance is not so noticeable, and the disadvantage is that it is difficult to form a thin adhesive layer. What is the particle size of the inorganic particles mentioned above? This is correlated with the thickness of the base material used, but in a distribution range where the diameter of a single grain is as small as 50μ, the anchoring force of a single grain is no longer effective, and therefore the shear resistance cannot be exerted, resulting in a shield. When the particle size becomes 125μ or more, it tends to break through the base material and damage the glass surface. To manufacture the adhesive tape according to the present invention. Either apply the above-mentioned adhesive solution to both sides of the substrate simultaneously using a dip coater, dry it, and roll it up with a release agent, or apply it to the front and back sides of the substrate using a roll coater or reverse coater. Separately apply the blended futan and let it dry. It is produced by winding it up directly or together with release paper and cutting it to the desired width. Embodiments of the adhesive tape for explosion-proof cathode ray tubes according to the present invention and its application will be described in detail with reference to the drawings. FIG. The pressure-sensitive adhesive layers 1 and 6 mixed with the inorganic particulate material 4 as described above are coated on both sides. As shown in FIG. 2, this adhesive tape 5 is pasted and wound around the conical surface 6 on the outside of the cathode ray tube, and is then shrink-fitted with a heated metal band 7 and pressurized from the outside. At this time, the glass surface 6
And the adhesive layers 1 and 3 facing the band surface 7 are pressurized. The inorganic particulate matter 4 contained in the layers 1 and 6 bites into the sheet base material 2 under the pressure of the band 7 as shown in an enlarged view in FIG. At the same time, it prevents the displacement of the glass surface 6 and the metal band 7, and exhibits shear resistance. Due to the frictional force of objects, it exhibits superior fixing performance compared to conventional adhesive tape. It is clear from the above description that the adhesive tape for explosion-proofing cathode ray tubes according to the present invention is an extremely effective means for explosion-proofing between glass and metal on the conical surface of cathode ray tubes. Even if it explodes, the glass fragments will not scatter because they are attached to the adhesive tape, preventing danger.The glass wall of the CRT can be made thinner, making it easier to use lightweight CRTs. It also has the advantage of being easy to manufacture. Application examples of the present invention will be described below, but it goes without saying that the present invention is not limited to these application examples. Application example 1 Silicon oxide with a maximum distribution particle size of 50μ and a maximum particle size of 125μ or less is added to a natural rubber adhesive in a 33% toluene solution.
0 parts by weight mixed, viscosity 9.800 cps/23°C
Create an adhesive solution. Next, this adhesive solution was coated on both sides of a polyester film base material with a thickness of 75 .mu.m using a dip coater so that the thickness after drying was 65 .mu.m on each side, and after drying, the solution was wound up together with a release paper. This adhesive tape was cut into a width of 16wR, and the adhesive properties and shear properties when wound were measured. Table 1 shows the results. Further, this tape is wound around the outside of the conical surface forming the apex angle 10 of a 12-inch (36,36 crn) color cathode ray tube, and a tape with a width of 13 w having the same length as the outer circumference of the tube is wrapped on the primary side.
The stainless steel band 11 was heated to about 500° C. and fitted, and 30 minutes later, the shift was observed, but no shift was observed. Application example 2 The same adhesive solution as in application example 1 was applied to a thickness of 12 mm.
Coat both sides of a 5μ Japanese paper tape base using a dip coater and dry to give a finished thickness of 300μ. This adhesive tape was then wound up together with release paper. Table 1 shows its adhesive properties and shear resistance. Furthermore, when this adhesive tape was wound outside the conical surface of a similar cathode ray tube and banded with the same band as in the first application example, no deviation of the band from the glass surface was observed. Application example 3 Iron powder with a maximum distribution particle size of 50μ and a long particle size of 75μ or less was mixed into an 334) ruene-ethyl acetate mixed solution acrylic adhesive with a solid content ratio of 5% by weight, resulting in a viscosity of 5.900cpa.
With the A-liquid formulation. Next, a similar iron powder with a viscosity of 21.0 was obtained by increasing the weight by 100%.
00cpa of liquid B was prepared, and first, liquid A was coated on one side of a 75μ thick polyester film base using a roll coater.
Coating and drying was carried out so that the thickness after drying was 50 μm. On the opposite side, liquid B was applied and dried in the same manner so that the thickness after drying was 100 μm, and the adhesive tape was wound together with release paper and cut into 6 widths of 16 pieces. The adhesive properties and shear properties of this adhesive tape are as shown in Table 1. Next, as in Application Examples 1 and 2, this adhesive tape was wrapped around the conical surface of the outer surface of the cathode ray tube at liquid A level, and banded with the band described above, but no deviation occurred. Comparative Example 1 In Application Example 3, instead of using liquid A, an Acrylic adhesive containing no iron powder and having a viscosity of 3.000 cpθ was added to 75μ so that the thickness after drying would be 45μ. Coat it on a thick polyester film base material with a roll coater and dry it.
On the other side, the above-described liquid B formulation was applied and dried to a thickness of 100 μm, rolled up together with release paper, and cut into 16-inch widths to prepare comparative adhesive tapes having the properties shown in Table 1. This adhesive tape was used under the same conditions as Application Example 3. When banding was done on the conical surface of a cathode ray tube,
The deviation after 30 minutes was a maximum of 10 minutes and a minimum of 3 hours, making it unusable. In this comparative example), results were obtained that were sufficient to prove the explosion-proof effect of the cathode ray tube according to the adhesive tape of the present invention. Note 1: Application examples 1 and 2 are both the front and back. Application example 3 is the A liquid surface, and comparative example 1 is the adhesive surface that does not contain particles. Note 2: A total load of 20 to 20 is applied to a tapered block with a cross section of 2.5 crn x 2.5 crn at an angle of 5, and the time required to produce a deviation of 10 at the block temperature shown in Table 6. Note 3: Grasp the corner of the mounting band and set the temperature change at -45°C for 5 hours and +80°C for 5 hours as one cycle.
The amount of deviation at the maximum deviation part after 0 cycles. Note 4: Maximum amount of deviation when holding the corner of the mounting band and applying a ring-shaped load of 12 () Kp for 30 minutes with the front of the cathode ray tube facing down. Note 5: Amount of deviation when a stainless steel band heated to 500°C is fitted onto the tape surface and 30 minutes have elapsed. From Table 1 above, it can be seen that the adhesive tape for explosion-proofing cathode ray tubes according to the present invention exhibits shear resistance due to pressure stress, and that cathode ray tubes wound with this tape exhibit sufficient explosion-proofing effects. 4. Brief description of the drawings Fig. 1 is a longitudinal cross-sectional side view of the adhesive tape for explosion-proofing a cathode ray tube according to the present invention, and Fig. 2 shows the adhesive tape shown in Fig. 1 applied to the conical glass surface of the cathode ray tube to reinforce it. FIG. 3 is a partially enlarged view showing a side cross-sectional view of the metal band frame being wound and a metal band frame fitted thereon. 1.3... Adhesive layer, 2... Tape base material, l...
Inorganic granules, 6... Conical glass of cathode ray tubes. 7...Metal band. Applicant Teraoka Seisakusho Co., Ltd.

Claims (1)

[Claims] An adhesive containing 5 to 150 parts by weight of inorganic particulates having a particle diameter of 125 microns or less and mainly distributing particles of 5 mm on both sides of a flexible substrate with a thickness of about 25 microns to 125 microns. An explosion-proofing method for a cathode ray tube, in which an adhesive tape having a thickness of about 50 μm or more is wound around the cone-shaped part of the cathode ray tube, and a heated band is contracted and fitted onto the wound adhesive tape.