KR20110062462A - Bobbin - Google Patents

Abstract

PURPOSE: A bobbin is provided to prevent the deterioration of an indication device by preventing flaws in a wound sheet. CONSTITUTION: A bobbin(200) comprises: a body(210); a shock absorbing sheet(220) attached to the surface of the body in the longitudinal direction of the body; and a sheet(230) wound on the outer circumference of the body. The sheet starts to wind from the location overlapped with the shock absorbing sheet, and the overlapped width of the shock absorbing sheet and the initially wound sheet is 0.55~0.85 times the width of the shock absorbing sheet.

Description

Bobbin {Bobbin}

The present invention relates to a bobbin, and more particularly to a bobbin to which a buffer sheet is attached.

In general, electrodes, dielectrics, barrier ribs, etc. of the plasma display panel may be formed by a photoresist method using a sheet such as a green sheet. On the other hand, such sheets can be wound on bobbins and stored and transported.

1A and 1B show a bobbin in which a conventional sheet is wound.

First, referring to FIG. 1A, the portion where the sheet begins to be wound is protruded by the thickness of the sheet, and then scratches may occur on the protruding portion of the sheet by the load of the wound sheet. When the scratched sheet is used in the display device, a poor transferability of the sheet may occur, and a thickness difference may occur after the sheet is baked, resulting in deterioration of display quality such as a stripe shape on the display device.

In addition, although FIG. 1B shows a comma-shaped bobbin having a step equivalent to the thickness of the sheet, in this case, as shown in FIG. 1B, the sheet may slip when the sheet is wound. Defective transfer may occur.

An object of the present invention is to provide a bobbin that can prevent scratches from occurring in a sheet.

The bobbin of the present invention for solving the above object includes a body, a buffer sheet attached to the surface of the body along the longitudinal direction of the body and a sheet wound on the outer peripheral surface of the body, the initial winding of the sheet overlaps with the buffer sheet Starts at the location.

Here, the width at which the buffer sheet and the initially wound sheet overlap is 0.55 to 0.85 times the width of the buffer sheet.

In addition, the bobbin of the present invention for solving the above object includes a cylindrical body and a buffer sheet attached to the surface of the cylindrical body along the longitudinal direction of the cylindrical body, the width of the buffer sheet is 0.23 times to the radius of the cylindrical body to 0.3 times.

According to the present invention, by attaching the buffer sheet to the surface of the bobbin, it is possible to prevent the sheet from being scratched by the load of the sheet wound on the bobbin, thereby preventing the display quality of the display device from being lowered.

Hereinafter, with reference to the drawings will be described the present invention in more detail.

2 is an exploded perspective view of the plasma display device.

The plasma display panel 50 includes a scan electrode 11, a sustain electrode 12, a sustain electrode 12, and an address electrode 22 formed on the lower substrate 20, which are pairs of sustain electrodes formed on the upper substrate 10.

The sustain electrode pairs 11 and 12 generally include transparent electrodes 11a and 12a and bus electrodes 11b and 12b formed of indium tin oxide (ITO), and bus electrodes 11b and 12b. Silver may be formed of a metal such as silver (Ag), chromium (Cr), or a lamination of chromium / copper / chromium (Cr / Cu / Cr) or a lamination of chromium / aluminum / chromium (Cr / Al / Cr). The bus electrodes 11b and 12b are formed on the transparent electrodes 11a and 12a to serve to reduce voltage drop caused by the transparent electrodes 11a and 12a having high resistance.

The storage electrode pairs 11 and 12 may be formed not only of the structure in which the transparent electrodes 11a 12a and the bus electrodes 11b and 12b are stacked, but also the bus electrodes 11b and 12b without the transparent electrodes 11a and 12a. have. This structure does not use the transparent electrodes (11a, 12a), there is an advantage that can lower the cost of manufacturing the panel. The bus electrodes 11b and 12b used in this structure can be various materials such as photosensitive materials in addition to the materials listed above.

Light between the scan electrodes 11 and the sustain electrodes 12 between the transparent electrodes 11a and 12a and the bus electrodes 11b and 11c to absorb external light generated outside the upper substrate 10 to reduce reflection. A black matrix (BM, 15) is arranged that functions to block and to improve the purity and contrast of the upper substrate 10.

The black matrix 15 is formed on the upper substrate 10. The first black matrix 15, the transparent electrodes 11a and 12a and the bus electrodes 11b and 12b are formed at positions overlapping the partition wall 21. It may be composed of second black matrices (11c, 12c) formed between. Here, the first black matrix 15 and the second black matrices 11c and 12c, also referred to as black layers or black electrode layers, may be simultaneously formed and physically connected in the formation process, or may not be simultaneously formed and thus not physically connected. .

In addition, when physically connected and formed, the first black matrix 15 and the second black matrix 11c and 12c may be formed of the same material, but may be formed of different materials when they are formed separately.

The upper dielectric layer 13 and the passivation layer 14 are stacked on the upper substrate 10 having the scan electrode 11 and the sustain electrode 12 side by side. Charged particles generated by the discharge are accumulated in the upper dielectric layer 13, and the protective electrode pairs 11 and 12 may be protected. The protective film 14 protects the upper dielectric layer 13 from sputtering of charged particles generated during gas discharge, and increases emission efficiency of secondary electrons.

The address electrode 22 is formed in the direction crossing the scan electrode 11 and the sustain electrode 12. The lower dielectric layer 24 and the partition wall 21 are formed on the lower substrate 20 on which the address electrode 22 is formed.

In addition, the phosphor layer 23 is formed on the surfaces of the lower dielectric layer 24 and the partition wall 21. The partition wall 21 has a vertical partition wall 21a and a horizontal partition wall 21b formed in a closed shape to physically distinguish the discharge cells, and prevent ultraviolet rays and visible rays generated by the discharge from leaking to the adjacent discharge cells. do.

In addition to the structure of the partition wall 21 illustrated in FIG. 2, the structure of the partition wall 21 having various shapes may be possible, and the R, G, and B discharge cells are illustrated and described as being arranged on the same line, but different shapes It is also possible to arrange them.

In addition, the phosphor layer 23 emits light by ultraviolet rays generated during gas discharge to generate visible light of any one of red (R), green (G), and blue (B). Here, an inert mixed gas such as He + Xe, Ne + Xe and He + Ne + Xe for discharging is injected into the discharge space provided between the upper / lower substrates 10 and 20 and the partition wall 21.

The electrodes 11, 12, 22, the upper dielectric layer 13, the lower dielectric layer 24, and the partition wall 21 form a paste on the base film, and manufacture the paste in a sheet shape, and then, the upper substrate. 10 or the lower substrate 20 may be formed through a lamination method.

These sheets are wrapped in bobbins to be stored and transported.

EMBODIMENT OF THE INVENTION Hereinafter, the bobbin for sheets which concerns on this invention is demonstrated in detail.

Figure 3a is a perspective view showing a bobbin for a sheet according to an embodiment of the present invention, Figure 3b is a cross-sectional view taken along the line AA 'of the sheet bobbin of Figure 3a.

3A and 3B, the bobbin 100 of the present invention may include a body 110 and a buffer sheet 120 attached to a portion of the surface of the body 110 along a length direction of the body 110. have.

The body 110 is for winding a sheet (not shown) to facilitate storage and transportation thereof, and may have a hollow shape, but is not limited thereto.

The buffer sheet 120 is attached to the surface of the body 110, as will be described later, when the sheet (not shown) is wound on the body 110, the sheet by the load of the wound sheet (not shown) (Not shown) is prevented from being deformed. On the other hand, the body 110 is preferably cylindrical in order to prevent the sheet (not shown) being wound by deformation.

The buffer sheet 120 may be formed by uniformly dispersing a binder and a plasticizer in a solvent, coating the surface of the body 110, and drying the same. At this time, since the solvent is evaporated in the drying step, the formed buffer sheet 120 includes only a binder and a plasticizer.

The binder imparts viscosity to the buffer sheet 120 so that the buffer sheet 120 may be attached to the body 110. The binder may include a resin composition that is cured by light irradiation, heat treatment, or both thereof. Acrylic, methacrylic, urethane, and the like may be used, and as the monomer which is a component of the polymer or copolymer contained in the binder, dimethyrol acrylamide, Dimethoxy methyl acrylamide, diethoxy methyl methacryl amide, etc. are mentioned, but it is not limited to these.

The monomer may be used as a homopolymer or in combination with other vinyl monomers, wherein other vinyl monomers may include acrylic acid esters such as acrylic acid, methacrylic acid and ethyl acrylate, methacrylic acid esters such as methyl methacrylate and meta Krillamide etc. are mentioned.

The binder may be included in an amount of 45 to 65 parts by weight relative to the buffer sheet 120. When the amount of the binder added is less than 45 parts by weight, it is difficult for the buffer sheet 120 to have sufficient adhesive force, so that the buffer sheet 120 may be dropped from the surface of the body 110 by the force wound during the winding of the sheet (not shown). Can be.

On the other hand, when the binder is included in excess of 65 parts by weight relative to the buffer sheet 120, it is difficult to have sufficient ductility, so step unevenness may occur due to the load of the rolled sheet (not shown). Therefore, the binder is preferably included in 45 to 65 parts by weight relative to the buffer sheet 120.

The plasticizer lowers the glass transition temperature (Tg) of the buffer sheet 120 to impart ductility to the buffer sheet 120, which includes dioctyl phthalate (DOP) and dioctyl azelate (DOZ). ), Triphenyl phosphate (TPP), tricresyl phosphate (TCP), triacetin, and the like, but are not limited thereto.

Preferably, the plasticizer is included in an amount of 35 to 55 parts by weight relative to the buffer sheet 120. When the amount of the plasticizer is less than 35 parts by weight, it is difficult for the buffer sheet 120 to have sufficient ductility. This is because dropping of the buffer sheet 120 may occur because the amount of binder contained is relatively reduced.

As described above, the buffer sheet 120 including the binder and the plasticizer has a width W of 0.23 of the radius R of the cylindrical body 110 to which the buffer sheet 120 is applied when the body 110 is cylindrical. It is preferable that it is times-0.3 times.

If the width W of the cushioning sheet 120 is smaller than 0.23 times the radius R of the cylindrical body 110, the area of the cushioning sheet 120 attached to the sheet (not shown) becomes too small. It may be difficult to attach with the sheet (not shown) due to the tension generated during winding of the (not shown), it is difficult to have a sufficient cushioning effect, while the width (W) of the buffer sheet 120 is cylindrical body 110 If the radius r is greater than 0.3 times, the load generated on the wound sheet (not shown) is sufficiently dispersed, but at the time of the second winding, the sheet (not shown) does not completely surround the cylindrical body 110 surface. This is because it may be wound and wrinkles may occur.

Meanwhile, the thickness T of the buffer sheet 120 to be formed is preferably formed in consideration of the thickness of the sheet (not shown) to be wound, but the thickness T of the buffer sheet 120 is formed to be 150 to 250 μm. It is desirable to be.

Since the strength of the cushioning sheet 120 is smaller than that of the wound sheet (not shown), the load generated during winding is used to modify the thickness of the cushioning sheet 120 and prevents deformation of the sheet (not shown). When the thickness T of the sheet 120 is smaller than 150 μm, it may not be able to absorb all of the load, and thus deformation of the sheet (not shown) may occur. On the contrary, the thickness T of the buffer sheet 120 may be If the thickness is greater than 250 μm, a step difference may occur in a sheet (not shown) wound up because the thickness T of the buffer sheet 120 after deformation is too thick.

4A is a view showing a shape in which the sheet of FIG. 3A is initially wound on a body, and FIG. 4B is an enlarged view of a portion C of FIG. 4A.

4A and 4B, the sheet 230 wound around the body 210 may be wound starting from a portion overlapping with the buffer sheet 220 formed on the surface of the body 210.

As such, when the initial winding of the sheet 230 starts at a position overlapping with the buffer sheet 220, the sheet 220 may be protruded by the thickness of the sheet 220, as described later in FIG. 5. It is possible to prevent the scratches that may occur in the protruding portion of the sheet 220 by the load of.

Meanwhile, referring to FIG. 4B, the width W ₁ overlapping the buffer sheet 220 and the sheet 230 initially wound is preferably 0.55 to 0.85 times the width W of the buffer sheet 220.

When the width W _{1 at} which the sheet 230 to be initially wound and the buffer sheet 220 overlap is smaller than 0.55 times the width W of the buffer sheet 220, the sheet 230 at the time of initial winding of the sheet 230 ), The adhesive sheet 220 may have difficulty in maintaining adhesion to the buffer sheet 220 due to the force wound during the initial winding of the sheet 230. On the other hand, when the width W ₁ overlaps the sheet 230 and the cushioning sheet 220 to be initially wound is larger than 0.85 times the width W of the buffer sheet 220, the sheet 230 may be wound during the second winding. The body 210 may be wound in a form that is not completely enclosed so that a wrinkle failure may occur in the sheet 230.

Table 1 below shows the buffer sheet 220 and the sheet 230 according to the ratio of the width W ₁ and the width W of the buffer sheet 220 and the buffer sheet 220 to be initially wound. It indicates the adhesion between the liver and whether wrinkles occur.

W ₁ / W Whether to maintain adhesion between the cushioning sheet and the sheet Wrinkles occur 0.5 × × 0.55 ○ × 0.6 ○ × 0.65 ○ × 0.7 ○ × 0.75 ○ × 0.8 ○ × 0.85 ○ × 0.9 ○ ○

FIG. 5 is a view illustrating a shape in which the sheet of FIG. 3A is wound two or more times on the body.

Referring to FIG. 5, the sheet 230 completely surrounds the body 210 from two windings, and presses the start of the sheet 230 to be initially wound. At this time, since the strength of the buffer sheet 220 formed on the surface of the body 210 in the longitudinal direction of the body 210 is smaller than the strength of the sheet 230 to be wound, the load generated during the winding of the buffer sheet 220 It will be used to modify the shape. As a result, the sheet 230 to be wound does not change shape.

On the other hand, the initial winding sheet 230 and the buffer sheet 220 is preferably 0.55 times to 0.85 times the width of the buffer sheet 220, which can be seen in Figure 5, the second winding sheet 230 and the body during the winding This is because it is possible to prevent an empty space between the 210 and prevent wrinkles that may occur, and maintain adhesion with the sheet 230 and the buffer sheet 220.

Figure 6a shows the deformation of the sheet when the sheet is wound on the body with a buffer sheet according to the present invention, Figure 6b is a diagram showing the deformation of the sheet when the sheet is wound on the conventional body.

6A and 6B both show the result of the deformation amount of the wound sheet when the sheet is wound and a weight of 10 kg is applied for 120 hours.

Here, Figure 6a is attached to the buffer sheet according to the present invention, the buffer sheet was produced to include 55 parts by weight of the acrylic binder and 45 parts by weight of dioctyl azelate (DOZ) as a plasticizer, Figure 6b is a double-sided This is the case when a sheet is attached by attaching a tape.

In the case of Figure 6a it can be seen that there is no deformation amount, that is, the thickness change of the sheet, while in the case of Figure 6b it can be seen that the deformation of about 1㎛. On the other hand, when the sheet is wound, the load is about 200-300 kg, and the deformation of the sheet will occur more substantially.

In addition, in the experiments under the same conditions as in FIGS. 6A and 6B described above, in which the weight of 10 kg was applied for 5 days, the deformation amount of the sheet when the buffer sheet according to the present invention was attached was measured to be less than 0.1 μm, but FIG. Under the condition of 6b, a strain of 1.4 mu m was generated.

Therefore, the bobbin to which the buffer sheet according to the present invention is attached has an advantage of preventing deformation of the wound sheet to improve image quality of the plasma display panel.

On the other hand, the above-described sheet is for forming any one selected from the electrode, the partition wall, or the dielectric layer of the plasma display panel, for example, a sheet for forming a dielectric layer, for example, the dielectric sheet is a dielectric film formed on the base film, the base film And a cover film attached over the material and the dielectric transfer material.

As the dielectric transfer material, a paste mainly composed of low melting glass powder, that is, glass paste, may be used, and the cover film may be automatically detached when the sheet is attached to the substrate. The base film is then attached onto the substrate with the dielectric transfer material applied thereon, and then removed. Thus, only the dielectric transfer material remains on the substrate, resulting in the formation of a dielectric layer.

While the above has been shown and described with respect to preferred embodiments of the invention, the invention is not limited to the specific embodiments described above, it is usually in the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or prospect of the present invention.

1A and 1B show a bobbin in which a conventional sheet is wound.

2 is an exploded perspective view of the plasma display device.

3A is a perspective view illustrating a bobbin according to an exemplary embodiment of the present invention, and FIG. 3B is a cross-sectional view taken along the line AA ′ of the bobbin of FIG. 3A.

4A is a view showing a shape in which the sheet of FIG. 3A is initially wound on a body, and FIG. 4B is an enlarged view of a portion C of FIG. 4A.

FIG. 5 is a view illustrating a shape in which the sheet of FIG. 3A is wound two or more times on the body.

Figure 6a shows the deformation of the sheet when the sheet is wound on the body with a buffer sheet according to the present invention, Figure 6b is a diagram showing the deformation of the sheet when the sheet is wound on the conventional body.

Claims (11)

Body; A cushioning sheet attached to a surface of the body along a length direction of the body; And It includes a sheet wound on the outer peripheral surface of the body, The initial winding of the sheet begins at a position overlapping the cushioning sheet. The method of claim 1, The overlapping width of the buffer sheet and the sheet to be initially wound is a bobbin of 0.55 times to 0.85 times the width of the buffer sheet. The method of claim 1, The body is cylindrical bobbin. The method of claim 3, wherein The width of the buffer sheet is a bobbin is 0.23 to 0.3 times the radius of the cylindrical body. The method of claim 1, Bobbin in which the strength of the sheet is greater than the strength of the cushioning sheet. The method of claim 1, The buffer sheet is a bobbin comprising 45 to 65 parts by weight of the binder and 35 to 55 parts by weight of a plasticizer. The method of claim 1, And the sheet forms any one selected from an electrode, a partition, or a dielectric layer of the plasma display panel. Cylindrical body; And A cushioning sheet attached to a surface of the cylindrical body along a longitudinal direction of the cylindrical body, The width of the cushioning sheet is a bobbin of 0.23 times to 0.3 times the radius of the cylindrical body. The method of claim 8, The buffer sheet is a bobbin comprising 45 to 65 parts by weight of the binder and 35 to 55 parts by weight of a plasticizer. The method of claim 8, The thickness of the buffer sheet is a bobbin of 170 to 230㎛. The method of claim 8, A bobbin further comprising a sheet wound on an outer circumferential surface of the bobbin.

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