WO2020153541A1

WO2020153541A1 - Glass manufacturing method for manufacturing thin cover glass

Info

Publication number: WO2020153541A1
Application number: PCT/KR2019/006468
Authority: WO
Inventors: 이일재; 서승필; 신기홍; 조성수
Original assignee: 코세스지티 주식회사
Priority date: 2019-01-22
Filing date: 2019-05-30
Publication date: 2020-07-30
Also published as: CN111452225B; KR102022450B1; CN111452225A

Abstract

One embodiment of a glass manufacturing method of the present invention comprises: a cutting step of cutting the shape of cover glass to be processed on a base material by using laser; a breaking step of separating the cut cover glass from the base material; a stacking step of stacking a plurality of sheets of cover glass one upon another; a polishing step of polishing exposed side surfaces of the plurality of stacked sheets of cover glass; a healing step for etching the exposed side surfaces of the sheets of cover glass by using a chemical; a separating step of individually separating the plurality of stacked sheets of cover glass by applying hot water; and a post-treatment step of post-treating the separated sheets of cover glass individually.

Description

Glass manufacturing method for manufacturing thin cover glass

Embodiments relate to a glass manufacturing method for manufacturing a thin cover glass that can effectively suppress breakage, deformation, product defects, and the like of the cover glass and reduce manufacturing time, cost, and effort.

The content described in this section merely provides background information for the embodiment and does not constitute a prior art.

Recently, various technologies related to a flexible body that can be applied to smartphones, tablet PCs, and other portable electronic devices have been developed. The flexible body is expected to be applied not only to portable electronic devices, but also to automobiles, home appliances, and various other products.

In constructing such a flexible body, it is required that the cover glass made of a glass material that can be used as an interface with a user to protect the body is also manufactured to be flexible.

Accordingly, the cover glass can be flexibly constructed by making the cover glass thin and allowing it to be easily folded.

On the other hand, in the case of manufacturing a glass cover glass in a thin form, since the cover glass has a very thin thickness, damage and deformation occur in the manufacturing process, resulting in product defects.

In addition, when a process for manufacturing a thin cover glass is to be handled carefully to prevent damage or the like due to the thin structure, as a result, a long manufacturing process may result in a problem of high cost.

Improvement is required.

Accordingly, the embodiment relates to a glass manufacturing method for manufacturing a thin cover glass that can effectively suppress breakage, deformation, and product defects of the cover glass and reduce manufacturing time, cost, and effort.

The technical problems to be achieved by the embodiments are not limited to the technical problems mentioned above, and other technical problems that are not mentioned will be clearly understood by a person having ordinary knowledge in the technical field to which the embodiment belongs from the following description.

One embodiment of a glass manufacturing method includes a cutting step of cutting a shape of a cover glass to be processed into a base material using a laser; A breaking step of separating the cut cover glass from the base material; A lamination step of laminating the cover glass in plurality; A polishing step of polishing exposed side surfaces of the plurality of stacked cover glasses; Healing step of etching the exposed side of the cover glass using a chemical; It may include a separation step of separately separating the cover glass stacked in a plurality by adding hot water (hot water) and a post-treatment step of post-processing the individually separated cover glass.

In one embodiment of the glass manufacturing method, the cutting step may be to form a crack that separates the cover glass from the base material, and the breaking step may be to expand the formed crack to separate the cover glass from the base material.

In the braking step, steam may be applied to the crack to expand the crack using thermal expansion, or the crack may be irradiated with a carbon dioxide laser to expand the crack.

In the laminating step, a filling material may be provided between the plurality of cover glasses stacked with each other.

The filling material may be a wax, and may have a thickness of 30 μm to 40 μm.

One embodiment of the glass manufacturing method may further include a chamfering step of chamfering the side surfaces of the plurality of stacked cover glasses after the laminating step is completed.

The chamfering step may be to chamfer a plurality of side surfaces of the cover glass using a CNC factory value.

The post-treatment step includes a chemical strengthening step of chemically strengthening the cover glass; A washing step of washing the cover glass; It may include a printing step of printing a pattern on the surface of the cover glass and a coating step of coating on the surface of the cover glass.

The coating step may be to proceed with at least one of the anti-reflective coating and anti-fingerprint coating.

In an embodiment, a plurality of individual cover glasses are stacked to perform chamfering, polishing, healing, etc., effectively suppressing breakage, deformation, and product defects of the cover glass, and at the same time increasing the working speed, the time required to manufacture the cover glass, Significant savings in cost and effort can be achieved.

In an embodiment, by interposing a filler between a plurality of stacked cover glasses, it is possible to effectively suppress wear and tear of the cover glass generated during processing, and effectively suppress unnecessary etching of the cover glass in a healing process.

1 is a flow chart showing a glass manufacturing method of the embodiment.

2 is a view for explaining the glass manufacturing method of the embodiment.

3 is a view showing a state in which the cover glass of the embodiment is laminated.

4 is a flow chart showing a post-processing step of the embodiment.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. Embodiments may be variously changed and have various forms, and specific embodiments will be illustrated in the drawings and described in detail in the text. However, it is not intended to limit the embodiment to a specific disclosure form, it should be understood that it includes all modifications, equivalents, or substitutes included in the spirit and scope of the embodiment.

The terms "first", "second", etc. can be used to describe various components, but the components should not be limited by the terms. The terms are used to distinguish one component from other components. In addition, terms specifically defined in consideration of the configuration and operation of the embodiments are only for describing the embodiments and do not limit the scope of the embodiments.

In the description of the embodiment, when described as being formed on the "top (top)" or "bottom (bottom) (on or under)" of each element, the top (top) or bottom (bottom) (on or under) ) Includes both two elements directly contacting each other or one or more other elements formed indirectly between the two elements. In addition, when expressed as “up (up)” or “down (down)” (on or under), it may include the meaning of the downward direction as well as the upward direction based on one element.

In addition, relational terms, such as "top/top/top" and "bottom/bottom/bottom" as used hereinafter, do not necessarily require or imply any physical or logical relationship or order between such entities or elements, It can also be used to distinguish one entity or element from another.

1 is a flow chart showing a glass manufacturing method of the embodiment. 2 is a view for explaining the glass manufacturing method of the embodiment. 3 is a view showing a state in which the cover glass 100 of the embodiment is stacked.

In the embodiment, thin glass is manufactured. Since thin glass has a high risk of breakage during processing, it is manufactured according to the following procedure to prevent such breakage and produce excellent products.

As shown in FIG. 1, the cover glass 100 is cut from the base material 10 and processed to complete the product. Of course, a plurality of cover glasses 100 may be cut out from one base material 10.

The glass manufacturing method of the embodiment includes a cutting step (S100), a breaking step (S200), a laminating step (S300), a chamfering step (S400), a polishing (polishing) step (S500), a healing step (S600), and a separation step (S700) and a post-treatment step (S800).

In an embodiment, the base material 10 is a disk for processing the cover glass 100, and the cover glass 100 can be used as a cover member of, for example, a thin display device, the base material 10 and the cover glass 100 ) Is the same material.

In the cutting step (S100), the shape of the cover glass 100 to be processed on the base material 10 may be cut using a laser. At this time, the base material 10 and the cover glass 100 may be made of glass, and the thickness may be very thin, for example, 0.2 mm or less.

In an embodiment, to separate the cover glass 100 from the base material 10, two steps may be performed: a cutting step (S100) and a breaking step (S200) described below. When the cover glass 100 is separated from the base material 10 in one step, damage or deformation of the cover glass 100 may result in product defects. In this embodiment, the cover glass 100 is subjected to these two steps. ) Is separated from the base material 10.

The thin cover glass 100 of the embodiment may cause damage or product failure when a strong physical impact is applied from the outside, so instead of a cutter that applies force directly to the base material 10, a laser is applied to the base material 10. The shape of the cover glass 100 is cut.

In this case, as the laser, for example, a YAG laser, a ruby laser, a carbon dioxide laser, an argon laser, and various other lasers may be used.

The cutting step (S100) may form a crack that separates the cover glass 100 from the base material 10. That is, cutting is an operation of forming a crack in the base material 10 to a predetermined thickness. When the cutting is completed, the shape of the cover glass 100 is cut on the base material 10, and the cover glass 100 is not yet separated from the base material 10.

In the breaking step (S200), the cut cover glass 100 may be separated from the base material 10. That is, in the breaking step (S200), the crack formed may be expanded to separate the cover glass 100 from the base material 10.

As in the cutting step (S100), the thin cover glass 100 may be damaged when a strong physical impact is applied from the outside, resulting in product defects. Breaking using a cutter tool that directly applies force to the base material 10 is It is not appropriate.

Therefore, in the braking step (S200), the crack is expanded using thermal expansion by adding steam (steam, water vapor) to the crack, or the carbon dioxide laser is irradiated to the crack to expand the crack to expand the crack to cover the cover glass 100. It is appropriate to separate from 10).

When high-temperature steam is applied to the crack portion formed in the base material 10, thermal expansion occurs in the crack portion, and the crack is further expanded by the thermal expansion, so that the cover glass 100 may be separated from the base material 10.

Alternatively, the cover glass 100 may be ultimately separated from the base material 10 by irradiating a crack with a carbon dioxide laser having a high absorption rate and high energy efficiency in the glass material to expand the crack.

In the stacking step (S300), a plurality of individual cover glasses 100 separated from the base material 10 through the breaking step (S200) may be stacked with each other. When the following chamfering, polishing, healing, etc. are performed separately on the thin cover glass 100, damage, deformation, product defects, etc. of the cover glass 100 may occur.

In the case of the cover glass 100 stacked in plural, since the total thickness is increased, it can withstand deformation well, and thus, the deformation of the cover glass 100 caused by such deformation is sufficiently suppressed even by physical impact from the outside, The occurrence of permanent deformation and product defects can be effectively suppressed.

Therefore, in the embodiment, the individual cover glass 100 is stacked in plural to perform chamfering, polishing, healing, etc., effectively suppressing damage, deformation, product defects, etc. of the cover glass 100, and at the same time increasing the working speed, The time, cost, and effort required to manufacture the cover glass 100 can be significantly reduced.

Considering that the cover glass 100 is a glass material, total thickness, convenience of processing, and provision of a filling material described below, for example, processing may be performed by stacking about 10 or more individual cover glasses 100. have.

As shown in FIG. 3, in the stacking step (S300 ), a filler 200 may be provided between the plurality of cover glasses 100 stacked with each other. A laminate of the cover glass 100 may be formed by applying the filling material 200 to the top surface of the cover glass 100, laminating the cover glass 100 for that purpose, and then applying the filling material 200 therefor.

Referring to FIG. 3, in the laminate of the cover glass 100, a plurality of cover glass 100 and a plurality of filler 200 layers are alternately stacked, for example, n cover glass 100 and n-1. The layers of the filling material 200 may be provided in an alternately stacked state.

Referring to FIG. 3, in order to protect the upper and lower surfaces of all the stacked cover glasses 100, the filling material 200 is applied to the lower surface of the first cover glass 100-1 and the upper surface of the n-th cover glass 100-n. You can also apply.

The filling material 200 is interposed between the cover glass 100 in the cover glass 100 laminate, and the wear and damage of the cover glass 100 due to direct contact and friction between the cover glass 100 adjacent to each other Can be suppressed.

In addition, the filling material 200 is applied to the top and bottom surfaces of the cover glass 100 except for the side surface 110 which is a processing part of the cover glass 100, in particular, the cover glass 100 during the healing step S600. ) Can effectively suppress the etching of the upper and lower surfaces by chemicals.

In an embodiment, by interposing the filling material 200 between the plurality of stacked cover glass 100, the wear and damage of the cover glass 100 generated during processing is effectively suppressed, and the cover glass in a healing step (S600). The unnecessary etching of (100) can be effectively suppressed.

It is appropriate that the filling material 200 is provided with a material having strong corrosion resistance and chemical resistance to effectively protect the surface of the cover glass 100 from chemicals in the healing step S600.

In addition, the filling material 200 exists as a solid at room temperature to easily block mutual contact between the cover glass 100 adjacent to each other, and when hot water is applied in the separation step S700 described below. It is appropriate to be liquefied and provided with a material that can easily separate the cover glass 100 from each other.

In view of this, it is appropriate that the filler 200 is provided with wax. More suitably, the filling material 200 is suitably provided with paraffin wax. Paraffin wax is mass-produced for industrial use and is relatively inexpensive, and the melting point can be easily melted by hot water at about 47°C to 64°C. However, the filling material 200 is not limited to wax, and may be provided with various other materials satisfying the above-described conditions.

The thickness of the filler 200 may be appropriately selected in consideration of the thickness of the cover glass 100, the material of the filler 200, and the like. When the cover glass 100 is a glass material having a thickness of 0.2 mm or less, and the filler 200 is a paraffin wax, the thickness of the filler 200 may be 30 μm to 40 μm.

The chamfering step (S400) may be performed after the laminating step (S300) is completed. Chamfering is to compensate for the stacking error caused by the stacking of the cover glass 100, that is, the side surface 110 of the stack of the cover glass 100 is not aligned at the same position in the vertical direction, but is arranged in a jagged manner. to be.

If the stacking error is left unchanged, the cover glass 100 in which the side surface 110 is particularly protruded among the stacks of the cover glass 100 in the healing step S600 is etched more, resulting in a specification error that cannot be accepted for the finished product. This is because product defects may occur due to the occurrence of.

In the chamfering step (S400 ), the side surfaces 110 of the plurality of stacked cover glasses 100 may be chamfered. The side surface 110 of the stacked cover glass 100 is appropriately cut to remove the stacking error due to the stacking of the cover glass 100.

At this time, since the chamfered and removed thickness may be additionally removed from the side surface 110 of the cover glass 100 in the following polishing step (S500) or healing step (S600), it is appropriately set in consideration of this.

In order to improve the precision of processing, in the chamfering step (S400), it is appropriate for the computer numerical control (CNC) to chamfer the side surfaces 110 of the plurality of cover glasses 100 using factory values. Since the chamfering process is precisely controlled by the CNC processing device, it is possible to significantly reduce the occurrence of product defects due to chamfering.

On the other hand, the tool for cutting the side surface 110 of the cover glass 100 in the chamfering step (S400), for example, a non-contact cutting device such as a laser device, as well as a mechanical cutting machine, scraper, or milling (milling) device, etc. A contact cutting device may also be used.

Since the plurality of stacked cover glass 100 is chamfered, compared to chamfering the individual cover glass 100, even if a contact cutting device is used, there is a possibility that the cover glass 100 may be damaged, deformed, or defective in product. Because it is very small.

The chamfering step (S400) may be selectively performed. In other words, if the lamination error caused by the lamination of the cover glass 100 is within the set design value, the error occurring in the finished product is within the acceptable range even if the chamfering step (S400) is not performed. S400) may not proceed.

Of course, when the lamination error due to the lamination of the cover glass 100 exceeds the set design value, the chamfering step (S400) is essentially performed.

In the polishing step (S500), the exposed side surfaces 110 of the plurality of stacked cover glasses 100 may be polished. At this time, the side surface 110 may be polished using a brush. By polishing the exposed side surface 110 of the cover glass 100, it is possible to remove fine cracks existing in the exposed side surface 110, which are generated by processing up to the chamfering step S400.

In the healing step (S600), the exposed side surface 110 of the cover glass 100 may be etched using chemicals. By etching the side surface 110, it is possible to remove fine chips remaining on the side surface 110 of the cover glass 100 generated by processing up to the polishing step (S500).

In addition, by etching the side surface 110, a sharp portion formed on the side surface 110 can be effectively removed, thereby making the side surface 110 into a smooth rounding shape as a whole.

The chemical used in the healing step (S600) is weakly acidic and can be selected and used as a liquid containing an appropriate component that can etch the side 110 of the glass cover glass 100 in a designed range.

For example, a healing step (S600) of dipping the cover glass 100 stacked on an immersion means containing liquid chemicals or spraying a liquid chemical on the stacked cover glass 100 Can proceed.

At this time, since the filling material 200 is applied to the surfaces (top and bottom surfaces) of the cover glass 100 except for the exposed side surface 110, the top surface of the cover glass 100 by chemicals is applied by the filling material 200. And etching of the lower surface can be effectively suppressed.

In the separation step (S700), hot water (hot water) is added to separate the cover glass 100 stacked in plural. As described above, when the filler 200 is provided with wax, when hot water is added, the filler 200 becomes liquid, and thus, the individual cover glasses 100 can be easily separated from the plurality of stacked cover glasses 100. Can.

For example, when the filler 200 is paraffin wax, when the cover glass 100 stacked in an immersion container containing hot water of about 70° C. or higher is immersed, the filler 200 melts and thus the individual cover glass 100 It can be easily separated from the plurality of stacked cover glass (100).

4 is a flow chart showing the post-processing step (S800) of the embodiment. In the post-treatment step (S800), the cover glass 100 separately separated may be post-processed. As shown in FIG. 4, the post-treatment step (S800) of the embodiment may include a chemical strengthening step (S810), a washing step (S820), a printing step (S830), and a coating step (S840).

In the chemical strengthening step (S810), the cover glass 100 may be chemically strengthened. As a chemical strengthening agent, for example, potassium nitrate may be used, and potassium contained in potassium nitrate may partially penetrate the surface of the cover glass 100, which is a glass material, and is replaced with a part of the glass, such as strength, hardness, etc. of the cover glass 100 The physical properties of can be improved.

The chemical strengthening step (S810) may be achieved, for example, by immersing the cover glass 100 in an immersion container containing a potassium nitrate solution to allow potassium to penetrate the surface of the cover glass 100 and to replace a portion of the glass with potassium. Can.

In the chemical strengthening step (S810), the cover glass 100 is heated to a high temperature and cooled to further heat-enhance the cover glass 100 to improve physical properties such as strength and hardness.

In the washing step (S820), the cover glass 100 may be washed using a washing liquid. The washing liquid used at this time may be, for example, de-ionized water.

In the washing step (S820), for example, by immersing the cover glass 100 in an immersion container containing pure water, and causing vortex in the immersion container, the cover glass is generated due to the processing up to the chemical strengthening step (S810). Foreign matter remaining in the (100) can be removed from the cover glass 100 using pure water.

Alternatively, pure water may be sprayed onto the cover glass 100 to remove the dirt remaining on the surface of the cover glass 100 from the cover glass 100.

In the printing step S830, a pattern may be printed on the surface of the cover glass 100. Depending on the use of the cover glass 100, it is necessary to form a transparent or opaque thin pattern on the surface of the cover glass 100.

Therefore, when it is necessary to form a pattern, the printing step S830 may be performed. Such pattern printing may be implemented by applying a printing material in a specific shape to the cover glass 100 using, for example, a gravure printing method or a screen printing method.

In the coating step (S840), the surface of the cover glass 100 may be coated. In the coating step S840, unlike the printing in the printing step S830, a functional coating film may be formed on the surface of the cover glass 100.

Such a coating can be, for example, anti-reflection coating or anti-finger coating. In addition, in order to suppress the user's visual field from being obstructed by moisture, the cover glass 100 may be subjected to a hydrophilic coating or a hydrophobic coating on the cover glass 100.

Although only a few are described as described above in connection with the embodiments, various other forms of implementation are possible. The technical contents of the above-described embodiments may be combined in various forms unless it is a technology incompatible with each other, and may be implemented as a new embodiment.

Claims

A cutting step of cutting the shape of the cover glass to be processed into the base material using a laser;

A breaking step of separating the cut cover glass from the base material;

A lamination step of laminating the cover glass in plurality;

A polishing step of polishing exposed side surfaces of the plurality of stacked cover glasses;

Healing step of etching the exposed side of the cover glass using a chemical;

Separation step of separately separating the cover glass laminated in a plurality by adding hot water (hot water) and

Post-processing step of post-processing the individually separated cover glass

Glass manufacturing method comprising a.
According to claim 1,

The cutting step forms a crack that separates the cover glass from the base material,

The breaking step is to expand the crack formed, characterized in that for separating the cover glass from the base material.
According to claim 2,

The braking step,

A method of manufacturing a glass, characterized in that steam is applied to the crack to expand the crack using thermal expansion, or the crack is extended by irradiating a carbon dioxide laser on the crack.
According to claim 1,

The laminating step,

A glass manufacturing method characterized in that a filling material is provided between the plurality of cover glasses stacked on each other.
According to claim 4,

The filling material is a wax, the glass manufacturing method characterized in that it is provided with a thickness of 30μm to 40μm.
According to claim 1,

After completion of the lamination step,

And a chamfering step of chamfering the side surfaces of the plurality of stacked cover glasses.
The method of claim 6,

The chamfering step,

Glass manufacturing method characterized by chamfering the side surfaces of a plurality of the cover glass using a CNC factory.
According to claim 1,

The post-processing step,

A chemical strengthening step of chemically strengthening the cover glass;

A washing step of washing the cover glass;

A printing step for printing a pattern on the surface of the cover glass and

Coating step of coating on the cover glass surface

Glass manufacturing method comprising a.
The method of claim 9,

The coating step,

Glass manufacturing method characterized in that at least one of the anti-reflective coating and fingerprint coating.