A low-hardness optical fiber panel suitable for seal carving and a preparation method and application thereof

Abstract

The application relates to a preparation method and application of a low-hardness optical fiber panel suitable for seal carving, and the preparation method comprises the following steps: firstly, single-filament drawing: embedding a low-hardness core material glass rod with a diameter of 24.0-29.8 mm and a low-hardness skin material glass tube with a thickness of 4.0-7.0 mm and an inner diameter of 24.5-30.3 mm to obtain an optical fiber preform rod, and then performing single-filament drawing on the optical fiber preform rod at 720-850 DEG C, so that the obtained single filament has a diameter of 2.95-3.15 mm; after the single filament is drawn into a first multifilament and a second multifilament, the second multifilament is arranged into a plate, hot-melt pressed and formed, and then finished, so that the low-hardness optical fiber panel is obtained. The low-hardness optical fiber panel is used, the requirement for a seal carving knife is low, and therefore the difficulty of a seal carving process is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of seal carving products, in particular to a low-hardness optical fiber panel suitable for seal carving and a preparation method and application thereof. BACKGROUND

[0002] Seal carving art is an art of making seals by integrating calligraphy, fine arts and sculpture based on seal script, and is a comprehensive traditional art with a unique national style. Traditional seal carving art is performed by using hard or soft materials. The hard materials include jade, metal and ivory, and the soft materials include Qingtian stone, Shoushan stone and wood. So far, there is no precedent of using optical fiber panels for seal carving. An optical fiber panel is formed by regularly arranging tens of millions of optical fibers, and has the characteristics of high numerical aperture, high resolution and optical zero thickness, and can transmit high-definition images without distortion. As a new high-tech material, the optical fiber panel has a texture similar to jade and stone, and can transmit seal characters from the bottom surface to the top surface with high fidelity, and has strong ornamental value. However, the optical fiber panel used for low-light night vision has high hardness, and requires a high-quality seal carving knife, which makes seal carving difficult. SUMMARY

[0003] The main purpose of the present application is to provide a low-hardness optical fiber panel suitable for seal carving, which can reduce the difficulty of the seal carving process.

[0004] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0005] A preparation method of a low-hardness optical fiber panel suitable for seal carving, comprising the following steps:

[0006] (1) Single-fiber drawing: a low-hardness core material glass rod with a diameter of 24.0-29.8 mm and a low-hardness skin material glass tube with a thickness of 4.0-7.0 mm and an inner diameter of 24.5-30.3 mm are nested with each other to obtain an optical fiber preform rod, and the optical fiber preform rod is drawn at 720-850℃ to obtain a single fiber with a diameter of 2.95-3.15 mm;

[0007] (2) First multifilament drawing: the drawn single fiber is stacked in a hexagonal manner, and arranged into a first composite rod with a regular hexagonal cross section in a manner of 4-6 single fibers per side, then a light-absorbing material glass is drawn into a light-absorbing fiber with a diameter of 0.40-0.65 mm, and the light-absorbing fiber is uniformly inserted into the gap of the first composite rod, and then the first composite rod with the inserted light-absorbing fiber is drawn at 720-850℃ to obtain a first multifilament with a hexagonal side size of 1.25-2.53 mm;

[0008] (3) Secondary multifilament drawing: the primary multifilaments are arranged into a secondary composite rod with a cross section of a regular hexagon with 14 multifilaments on each side, and the secondary composite rod is drawn into a secondary multifilament with a hexagonal side size of 1.10-1.20 mm at 750-850℃;

[0009] (4) Plate arranging and hot melt compression molding: the secondary multifilaments are cut into a length of 113-133 mm, and then arranged into a regular hexagonal plate segment with a side size of 32-33 mm with 17 secondary multifilaments on each side, and then placed into a hot melt compression molding mold, and subjected to mechanical vacuum hot melt compression at 600-700℃ to melt and mold the fiber bundle of the regular hexagonal plate segment into a plate segment with a side size of 26-29 mm, i.e. a low-hardness optical fiber panel blank plate segment;

[0010] (5) Finishing: the prepared low-hardness optical fiber panel blank plate segment is subjected to rounding, cutting, and end face grinding and polishing operations to process a low-hardness optical fiber panel blank, and the low-hardness optical fiber panel blank is subjected to size processing to process a low-hardness optical fiber panel.

[0011] The low-hardness core material glass rod is prepared from low-hardness core material glass;

[0012] The low-hardness core material glass comprises the following components in weight percentage: SiO2 12-16%, Al2O3 1-5%, B2O3 20-32%, MgO 0.5-3%, CaO 2-4%, BaO 0-5%, La2O3 22-30%, Nb2O5 5-6%, Ta2O5 2-3%, ZnO 1-4%, TiO2 1-2%, ZrO2 3-5%, Na2O 1-2%, K2O 4-8%.

[0013] The preparation method of the low-hardness core material glass rod comprises the following steps:

[0014] (1) Put quartz sand, aluminum oxide, boric acid, magnesium oxide, calcium oxide, barium oxide, lanthanum oxide, niobium oxide, tantalum oxide, zinc oxide, titanium dioxide, zirconium oxide, sodium oxide, and potassium oxide into a platinum gold crucible according to the batching requirements;

[0015] (2) melt at a first preset temperature for a first preset time, and stir 1-2 times during the melting process, each time for 10-12 hours, at a stirring speed of 3-5 revolutions per minute, and then cool to a second preset temperature and clarify for a second preset time;

[0016] (3) The clarified glass melt flows down through the discharge port and is cast into a glass rod in a mold;

[0017] (4) the formed glass rod is annealed in an annealing furnace, kept at a third preset temperature for a third preset time, then cooled from the third preset temperature to a fourth preset temperature for a fourth preset time, and then cooled with the furnace to room temperature to obtain a low-hardness core material glass rod.

[0018] The first preset temperature is 1500-1600℃, the first preset time is 4-8 hours, the second preset temperature is 1300-1350℃, and the second preset time is 1-2 hours.

[0019] The third preset temperature is 600-650℃, the third preset time is 0.8-1.2 hours, the fourth preset time is 11-13 hours, and the fourth preset temperature is 50-70℃.

[0020] The low-hardness skin material glass tube is prepared from low-hardness skin material glass, and the low-hardness skin material glass comprises the following components in percentage by weight: SiO2 45-55%, B2O3 20-28%, Al2O3 4-5%, MgO 0.5-1.5%, Na2O 1.5-3%, K2O 10-15%, Li2O 0-2%, CaO 0.5-1%, ZnO 0-1.5%, TiO2 1-2%, and ZrO2 4-5%.

[0021] The preparation method of the low-hardness skin material glass tube comprises the following steps:

[0022] (1) putting quartz sand, boric acid, aluminum oxide, magnesium oxide, sodium oxide, potassium oxide, lithium oxide, and raw materials for introducing calcium oxide, zinc oxide, titanium dioxide, and zirconium dioxide into a platinum crucible according to the batching requirements;

[0023] (2) melting at a fifth preset temperature for a fifth preset time;

[0024] (3) forming the molten glass melt into a tube through a tube drawing machine;

[0025] (4) annealing the formed glass tube in an annealing furnace, keeping at a sixth preset temperature for a third preset time, then cooling from the sixth preset temperature to a fourth preset temperature for a sixth preset time, and then cooling with the furnace to room temperature to obtain a low-hardness skin material glass tube.

[0026] The fifth preset temperature is 1350-1450℃, the fifth preset time is 6-9 hours, the sixth preset temperature is 500-550℃, and the sixth preset time is 9-11 hours.

[0027] The application further provides a low-hardness optical fiber panel suitable for seal carving, which is prepared according to the preparation method.

[0028] The application further provides the application of the low-hardness optical fiber panel in seal carving.

[0029] By the technical scheme, the application has at least the following advantages:

[0030] The low-hardness optical fiber panel can reduce the requirement for the seal carving knife, thereby reducing the difficulty of the seal carving process.

[0031] The hardness of the optical fiber panel mainly depends on the composition and structure of the glass. The quartz glass has the highest hardness in the silicate glass, the hardness is reduced by adding alkali metal oxides, and the relationship between the cation radius and the hardness is inversely proportional. In R + and R 2+ , the order can be Li + >Na + >K + ; Be 2+ >Mg 2+ >Ca 2+ >Sr 2+ >Ba 2+ ; Cd 2+ >Zn 2+ ; Ni 2+ >Co 2+ >Fe 2+ . In order to obtain the low-hardness optical fiber panel, the oxides with small cation radius such as Li2O and MgO should be reduced in the glass, and the introduction of the network extra body oxides can also reduce the hardness of the glass.

[0032] In the composition of the optical fiber panel, the hardness of the core glass is greater than that of the cladding glass, the volume percentage of the cladding glass in the optical fiber panel can be increased by 1.4%-1.6%, and the hardness of the optical fiber panel is reduced.

[0033] In the low-hardness core glass and the low-hardness cladding glass of the application:

[0034] SiO2 is an important glass forming oxide, and irregular continuous network is formed by the structural unit of silicon-oxygen tetrahedron [SiO4], which becomes the skeleton of the glass. In the sodium-calcium silicate glass, SiO2 can reduce the thermal expansion coefficient of the glass, improve the thermal shock stability, chemical stability, softening temperature, heat resistance, hardness, mechanical strength, viscosity and ultraviolet light transmission performance of the glass.

[0035] Al2O3 is an intermediate oxide. When the molar ratio of Na2O to Al2O3 in the glass is greater than 1, aluminum-oxygen tetrahedra are formed and join with silicon-oxygen tetrahedra to form a continuous network structure. When the molar ratio of Na2O to Al2O3 is less than 1, octahedra are formed and exist in the holes of the silicon-oxygen network. Al2O3 can reduce the tendency of the glass to crystallize and increase the chemical stability, thermal stability, mechanical strength, hardness, and refractive index of the glass.

[0036] B2O3 is a glass-forming oxide. It has [BO3] and boron-oxygen tetrahedra [BO4] as structural units and, together with silicon-oxygen tetrahedra, forms a network structure in borosilicate glass. B2O3 can reduce the expansion coefficient of the glass, increase the thermal stability and chemical stability of the glass, and improve the mechanical properties of the glass.

[0037] MgO is an interstitial oxide in sodium-calcium silicate glass. Replacing part of CaO with MgO in the glass at a content of less than 3.5% can slow the hardening speed of the glass, improve the forming properties of the glass, and reduce the difficulty of glass production. MgO can also reduce the tendency and speed of crystallization, increase the high-temperature viscosity of the glass, and increase the chemical stability and mechanical strength of the glass.

[0038] CaO is a divalent alkaline earth metal oxide. It is an interstitial oxide and a stabilizer in the glass, i.e., it increases the chemical stability and mechanical strength of the glass. However, when the content is relatively high, it can increase the tendency of the glass to crystallize and make the glass brittle. In general, the content of CaO in the glass is ≤12.5%.

[0039] BaO is a divalent interstitial oxide. It increases the refractive index, density, luster, and chemical stability of the glass. A small amount of BaO (0.5%) can accelerate the melting of the glass.

[0040] La2O3 is a lanthanide rare earth oxide. It can increase the refractive index of the glass, but when the content of La2O3 is greater than 34 wt.%, it can increase the thermal expansion coefficient of the glass. Nb2O5 is a rare earth oxide. It can increase the refractive index of the glass, improve the process properties of the glass, and lengthen the melting of the glass. The content of Nb2O5 is 4-8 wt.%, but when the content of Nb2O5 is greater than 8 wt.%, it can increase the density and thermal expansion coefficient of the glass.

[0041] Ta2O5 is a rare earth oxide. It can increase the refractive index of the glass, but when the content increases, it can increase the manufacturing cost of the glass.

[0042] ZnO typically uses zinc-oxygen octahedrons [ZnO6] as the network outer oxide. When there is sufficient free oxygen in the glass, zinc-oxygen tetrahedra [ZnO4] can be formed and enter the glass's structural network, making the glass structure more stable. ZnO can reduce the coefficient of thermal expansion of glass, and improve its chemical stability, thermal stability, and refractive index.

[0043] TiO2 is an intermediate oxide. In silicate glasses, some TiO2 enters the structural network as titanium-oxygen tetrahedra [TiO4], while some exists outside the structure as [TiO6] octahedra. TiO2 can increase the refractive index of the glass.

[0044] ZrO2 is an intermediate oxide that can improve the viscosity, hardness, elasticity, refractive index, and chemical stability of glass, while reducing its coefficient of thermal expansion.

[0045] Na₂O is an oxide on the outer layer of a glass network. + Na₂O resides within the voids of the glass structure network. It provides free oxygen, increasing the O / Si ratio in the glass structure and causing bond breakage, thus reducing the viscosity of the glass and making it easier to melt; it acts as a glass flux. However, Na₂O increases the coefficient of thermal expansion of glass and reduces its thermal stability, chemical stability, and mechanical strength, so excessive amounts should be avoided.

[0046] K₂O is a network exooxide, and its function in glass is similar to that of Na₂O. + The radius is greater than Na + Potassium glass has a higher viscosity than sodium glass, which reduces the tendency of glass to crystallize and increases its transparency and gloss.

[0047] Li₂O is a network oxide. Its role in glass is more unique than that of Na₂O and K₂O. When the O / Si ratio is low, it primarily functions to break bonds and has a strong fluxing effect, acting as a powerful flux. Since the ionic radius of lithium is smaller than that of sodium and potassium, and the O / Si ratio in this invention is high, Li₂O mainly plays a precipitating role. Replacing Na₂O or K₂O with Li₂O reduces the coefficient of thermal expansion and increases the hardness of the glass.

[0048] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0049] Figure 1 A cross-sectional fiber diagram of the low-hardness fiber optic panel provided by the present invention;

[0050] Figure 2is a single filament cross-sectional view of Example 1, Example 2 and Example 3 provided by the present application;

[0051] Figure 3 is a single filament cross-sectional view of Example 4 provided by the present application.

[0052] in the figure:

[0053] 1 - fiber panel; 2 - secondary filament; 3 - core glass; 4 - skin glass; 5 - primary filament. DETAILED DESCRIPTION

[0054] To further clarify the objects of the application, the technical means adopted by the present application and the effects thereof, specific embodiments, structures, features and effects of the present application are described in detail below in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "embodiments" do not necessarily refer to the same embodiment. In addition, the specific features, structures or characteristics in one or more embodiments can be combined in any suitable form.

[0055] The parameters and measuring instruments measured for the core glass, skin glass and finished fiber panel for low hardness fiber panel of the present application are as follows:

[0056] All "weight percentage wt.%" is based on the total weight of the final glass composition, and the glass chemical composition (wt.%) of the examples is listed in detail in Table 1. The hardness of the glass is measured by using a high-precision Vickers hardness tester.

[0057] Referring to Figure 1 , the fiber panel 1 is formed by arranging a plurality of secondary filaments 2 and then hot pressing.

[0058] Referring to Figure 2 and Figure 3 , the core glass 3 is provided with a skin glass 4, and the core glass 3 and the skin glass 4 are nested to draw a single filament, and the single filaments are arranged to draw a primary filament 5.

[0059] Table 1, Example Chemical Composition (wt.%) and Glass Performance

[0060]

[0061]

[0062] Example 1:

[0063] Preparation of low hardness core glass rod:

[0064] The raw materials of the glass composition of the core glass of Example 1 in Table 1 were selected, 15.2% SiO2, 1.0% Al2O3, 22.7% B2O3, 2.8% MgO, 2.0% CaO, 5.0% BaO, 28.0% La2O3, 6.0% Nb2O5, 2.5% Ta2O5, 4.0% ZnO, 2.0% TiO2, 3.0% ZrO2, 1.2% Na2O, 4.6% K2O were put into a platinum crucible, melted at 1600°C for 8 hours, and stirred once during the melting process, with a stirring speed of 4 revolutions per minute, and then cooled to 1350°C, and clarified for 1 hour. The clarified glass melt was poured through a pouring hole into a mold to form a glass rod. The formed glass rod was annealed in an annealing furnace, and held at 650°C for 1 hour, and then cooled from 650°C to 60°C over a period of 12 hours, and then cooled to room temperature with the furnace. A low-hardness core glass rod was obtained.

[0065] Preparation of a low-hardness cladding glass tube:

[0066] The raw materials of the glass composition of the cladding glass 1 of Example 1 in Table 1 were selected, 52.1% SiO2, 4.2% Al2O3, 20.3% B2O3, 0.8% CaO, 1.7% TiO2, 3.0% ZrO2, 1.2% MgO, 1.8% Na2O, 10.9% K2O, 2.0% Li2O were put into a platinum crucible, melted at 1450°C for 9 hours, and then the melted glass melt was drawn into a tube by a tube drawing machine. The formed glass tube was annealed in an annealing furnace, and held at 550°C for 1 hour, and then cooled from 550°C to 60°C over a period of 10 hours, and then cooled to room temperature with the furnace. A cladding glass tube was obtained.

[0067] Preparation of a low-hardness optical fiber panel:

[0068] (1) Single filament drawing: a low-hardness core glass rod with a diameter of 29.5 mm and a low-hardness cladding glass tube with a thickness of 4 mm and an inner diameter of 30.0 mm were nested with each other to obtain an optical fiber preform rod. The optical fiber preform rod was drawn at 850°C to obtain a single filament with a diameter of 3.15 mm.

[0069] (2) Primary multifilament drawing: the drawn single filaments were stacked in a hexagonal closest packing manner, and arranged into a primary composite rod with a cross section of a regular hexagon with 6 single filaments on each side. Then, an optical absorption material glass was drawn into optical absorption filaments with a diameter of 0.45 mm, and the optical absorption filaments were uniformly inserted into the gaps of the primary composite rod. Then, the primary composite rod with the inserted optical absorption filaments was drawn at 850°C to obtain a primary multifilament with a size of 1.30 mm on opposite sides. A cross-sectional view of the primary multifilament is shown in Figure 2 .

[0070] (3) Secondary multifilament drawing: the primary multifilament is arranged into a secondary composite rod with a cross section of regular hexagon with 14 filaments on each side, and the secondary composite rod is drawn into a secondary multifilament with a hexagonal side size of 1.20 mm at 850℃;

[0071] (4) Plate arrangement and hot melt compression molding: the secondary multifilament is cut into a length of 133 mm, and then arranged into a regular hexagonal plate segment with a side size of 33 mm with 17 secondary multifilaments on each side, and then placed into a hot melt compression molding mold, and subjected to mechanical vacuum hot melt compression at 700℃, so that the fiber bundles of the regular hexagonal plate segment are fused and molded into a plate segment with a side size of 29 mm, i.e. a low-hardness optical fiber panel blank plate segment;

[0072] (5) Finishing: the prepared low-hardness optical fiber panel blank plate segment is subjected to rounding, cutting, and end face grinding and polishing operations to process a low-hardness optical fiber panel blank, and the low-hardness optical fiber panel blank is subjected to size processing to process a low-hardness optical fiber panel.

[0073] Example 2:

[0074] Preparation of low-hardness core material glass rod:

[0075] According to the composition of the core material glass in Table 1, Example 2, raw materials are selected, 14.6% SiO2, 1.6% Al2O3, 22.4% B2O3, 2.5% MgO, 2.9% CaO, 3.5% BaO, 27.5% La2O3, 5.7% Nb2O5, 2.3% Ta2O5, 3.8% ZnO, 1.6% TiO2, 4.7% ZrO2, 1.7% Na2O, 5.2% K2O are put into a platinum gold crucible, melted at 1580℃ for 6 hours, and stirred twice during the melting process, each time for 10 hours, with a stirring speed of 3 revolutions per minute, then cooled to 1330℃, and clarified for 2 hours. The clarified glass melt is flowed down through the discharge port and poured into a mold to form a glass rod. The shaped glass rod is annealed in an annealing furnace, annealed at 600℃ for 1.2 hours, then cooled from 600℃ to 70℃ over a period of 10 hours, and then cooled to room temperature with the furnace, to obtain a low-hardness glass.

[0076] Preparation of low-hardness skin material glass tube:

[0077] The raw materials were selected according to the composition of the skin glass in Table 1, Example 2. 50.2% SiO2, 4.9% Al2O3, 22.3% B2O3, 0.8% CaO, 1.2% ZnO, 1.5% TiO2, 4.2% ZrO2, 0.8% MgO, 1.9% Na2O, 11.9% K2O, and 0.3% Li2O were put into a platinum-gold crucible, and then melted at 1380°C for 7 hours. The molten glass was formed into a glass tube by a tube drawing machine. The formed glass tube was annealed in an annealing furnace at 550°C for 1 hour, and then cooled from 550°C to 60°C in 10 hours, and then cooled to room temperature in the furnace. A glass tube of the skin glass was obtained.

[0078] Preparation of a low-hardness optical fiber panel:

[0079] (1) Single-filament drawing: a low-hardness core glass rod with a diameter of 29.5 mm and a low-hardness skin glass tube with a thickness of 6 mm and an inner diameter of 30.0 mm were nested with each other to obtain an optical fiber preform rod. The optical fiber preform rod was drawn at 790°C to obtain a single filament with a diameter of 3.10 mm.

[0080] (2) Primary multifilament drawing: the drawn single filament was stacked in a hexagonal closest packing manner, and arranged into a primary composite rod with a cross section of a regular hexagon with 6 single filaments on each side. Then, an optical absorption glass was drawn into an optical absorption filament with a diameter of 0.40 mm, which was uniformly inserted into the gap of the primary composite rod. Then, the primary composite rod with the inserted optical absorption filament was drawn at 790°C to obtain a primary multifilament with a side length of 1.28 mm. Figure 2

[0081] (3) Secondary multifilament drawing: the primary multifilament was arranged into a secondary composite rod with a cross section of a regular hexagon with 14 multifilaments on each side. Then, the secondary composite rod was drawn at 790°C to obtain a secondary multifilament with a side length of 1.10 mm.

[0082] (4) Panel arrangement and hot melt pressure forming: the secondary multifilament was cut into a length of 133 mm, and then arranged into a panel segment with a side length of 32 mm and a regular hexagon shape with 17 secondary multifilaments on each side. Then, the panel segment was put into a hot melt pressure forming mold, and subjected to mechanical vacuum hot melt pressure at 680°C to fuse and form the fiber bundle of the regular hexagonal panel segment into a panel segment with a side length of 27.5 mm, i.e. a low-hardness optical fiber panel blank panel segment.

[0083] (5) Finishing: the prepared low-hardness optical fiber panel blank panel segment was subjected to rounding, cutting, and end face grinding and polishing to obtain a low-hardness optical fiber panel blank. The low-hardness optical fiber panel blank was subjected to size processing to obtain a low-hardness optical fiber panel.

[0084] Example 3: ​

[0085] Preparation of low hardness core glass rod:

[0086] According to the glass composition of Example 3 in Table 1, raw materials were selected, 12.8% SiO2, 4.9% Al2O3, 30.5% B2O3, 0.8% MgO, 3.8% CaO, 0.3% BaO, 22.5% La2O3, 5.4% Nb2O5, 2.2% Ta2O5, 1.5% ZnO, 1.5% TiO2, 4.5% ZrO2, 1.5% Na2O, 7.8% K2O were put into a platinum crucible, melted at 1500°C for 4 hours, and stirred once during the melting process, with a stirring speed of 5 revolutions per minute, and then cooled to 1300°C, and clarified for 1 hour. The clarified glass melt was poured through a pouring hole into a mold to form a glass rod. The formed glass rod was annealed in an annealing furnace, and held at 640°C for 0.8 hours, then cooled from 640°C to 50°C over a period of 13 hours, and then cooled to room temperature with the furnace, to obtain a low hardness glass.

[0087] Preparation of low hardness skin glass tube:

[0088] According to the glass composition of Example 3 in Table 1, raw materials were selected, 45.9% SiO2, 5.0% Al2O3, 26.6% B2O3, 0.5% CaO, 0.8% ZnO, 1.2% TiO2, 4.0% ZrO2, 0.5% MgO, 2.7% Na2O, 12.8% K2O were put into a platinum crucible, melted at 1350°C for 6 hours, and the clarified glass melt was drawn into a tube by a tube drawing machine. The formed glass tube was annealed in an annealing furnace, and held at 550°C for 1 hour, then cooled from 550°C to 60°C over a period of 10 hours, and then cooled to room temperature with the furnace, to obtain a low hardness skin glass tube.

[0089] Preparation of low hardness optical fiber panel:

[0090] (1) Single filament drawing: a low hardness core glass rod with a diameter of 29.5 mm and a low hardness skin glass tube with a thickness of 7 mm and an inner diameter of 30.0 mm were nested with each other to obtain an optical fiber preform rod. The optical fiber preform rod was drawn at 720°C to obtain a single filament with a diameter of 2.95 mm.

[0091] (2) Primary multifilament drawing: the drawn single filaments were stacked in a hexagonal closest packing manner, and arranged into a primary composite rod with a cross-section in the shape of a regular hexagon with 6 single filaments on each side. Then, an optical absorption material glass was drawn into an optical absorption filament with a diameter of 0.40 mm, and the optical absorption filament was uniformly inserted into the gaps of the primary composite rod. Then, the primary composite rod with the inserted optical absorption filament was drawn at 750°C to obtain a primary multifilament with a pair of side dimensions of 1.25 mm. A cross-sectional view of the primary multifilament is shown in Figure 2 .

[0092] (3) Secondary filament drawing: the primary filaments are arranged into a secondary composite rod with a cross section of regular hexagon with 14 filaments per side, and then the secondary composite rod is drawn into a secondary filament with a hexagonal side size of 1.15 mm at 750°C;

[0093] (4) Plate arrangement and hot melt compression molding: the secondary filaments are cut into a length of 120 mm, and then arranged into a regular hexagonal plate segment with a side size of 33 mm with 17 secondary filaments per side, and then placed into a hot melt compression molding mold, and subjected to mechanical vacuum hot melt compression at 650°C, so that the fiber bundles of the regular hexagonal plate segment are fused and molded into a plate segment with a side size of 26.3 mm, i.e. a low-hardness optical fiber panel blank plate segment;

[0094] (5) Finishing: the prepared low-hardness optical fiber panel blank plate segment is subjected to rounding, cutting, and end face grinding and polishing operations to process a low-hardness optical fiber panel blank, which is subjected to size processing to process a low-hardness optical fiber panel.

[0095] Example 4:

[0096] The material compositions of the low-hardness core glass and the cladding glass tubes of Example 4 are the same as those of Example 3. However, the volume content of the cladding glass in the optical fiber panel of Example 4 is higher than that of the optical fiber panel of Example 3. The preparation method of the low-hardness core glass rod and the low-hardness cladding glass tube is the same as that of Example 3.

[0097] Preparation of a low-hardness optical fiber panel:

[0098] (1) Single filament drawing: a low-hardness core glass rod with a diameter of 27.5 mm and a low-hardness cladding glass tube with a thickness of 4.0 mm and an inner diameter of 28.0 mm are nested with each other to obtain an optical fiber preform rod, and the optical fiber preform rod is drawn into a single filament with a diameter of 3.15 mm at 720°C;

[0099] (2) Primary filament drawing: the drawn single filaments are stacked in a hexagonal closest packing manner, and arranged into a primary composite rod with a cross section of regular hexagon with 4 single filaments per side, and then an optical absorption glass is drawn into an optical absorption filament with a diameter of 0.65 mm, which is uniformly inserted into the gap of the primary composite rod, and then the primary composite rod with the inserted optical absorption filament is drawn into a primary filament with a side size of 2.53 mm at 720°C; the cross section of the primary filament is shown in Figure 3 .

[0100] (3) Secondary filament drawing: the primary filaments are arranged into a secondary composite rod with a cross section of regular hexagon with 14 filaments per side, and then the secondary composite rod is drawn into a secondary filament with a hexagonal side size of 1.2 mm at 800°C;

[0101] (4) Arranging and hot melt compression molding: the secondary multifilament is cut into 113mm in length, then arranged into a 33mm square hexagonal plate segment, and then put into a hot melt compression molding mold, and then mechanical vacuum hot melt compression is carried out at 600 DEG C, so that the fiber bundle of the square hexagonal plate segment is fused and molded into a 28.5mm square plate segment, that is, a low-hardness optical fiber panel blank plate segment;

[0102] (5) Finishing: the prepared low-hardness optical fiber panel blank plate segment is subjected to rounding, cutting and end face grinding and polishing operations to process a low-hardness optical fiber panel blank, and the low-hardness optical fiber panel blank is subjected to size processing, that is, to process a low-hardness optical fiber panel.

[0103] The Mohs hardness of the optical fiber panel of the present embodiment 4 is 3.9723.

[0104] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content without departing from the scope of the present application, and any simple modification, equivalent change and modification of the above embodiment according to the technical essence of the present application are still within the scope of the present application.

Claims

1. A method for preparing a low-hardness optical fiber panel suitable for engraving, characterized in that, It comprises the following steps: (1) Single filament drawing: a low-hardness core material glass rod with a diameter of 24.0-29.8 mm and a low-hardness skin material glass tube with a thickness of 4.0-7.0 mm and an inner diameter of 24.5-30.3 mm are nested with each other to obtain an optical fiber preform rod, and the optical fiber preform rod is drawn at 720-850℃ to obtain a single filament with a diameter of 2.95-3.15 mm; (2) Primary multifilament drawing: the drawn single filaments are stacked in a hexagonal manner, arranged into a primary composite rod with a cross section of a regular hexagon in a manner of 4-6 single filaments per side, and then an optical absorption material glass is drawn into an optical absorption filament with a diameter of 0.40-0.65 mm, which is uniformly inserted into the gap of the primary composite rod, and then the primary composite rod with the inserted optical absorption filament is drawn into a primary multifilament with a hexagonal opposite side size of 1.25-2.53 mm at 720-850℃; (3) Secondary multifilament drawing: the primary multifilament is arranged into a secondary composite rod with a cross section of a regular hexagon in a manner of 14 per side, and then the secondary composite rod is drawn into a secondary multifilament with a hexagonal opposite side size of 1.10-1.20 mm at 750-850℃; (4) Board arrangement and hot melt compression molding: the secondary multifilament is cut into a length of 113-133 mm, then arranged into a regular hexagonal board section with an opposite side size of 32-33 mm in a manner of 17 secondary multifilaments per side, and then placed into a hot melt compression molding mold, and subjected to mechanical vacuum hot melt compression at 600-700℃ to fuse and mold the fiber bundle of the regular hexagonal board section into a board section with an opposite side size of 26-29 mm, i.e. a low-hardness optical fiber panel blank board section; (5) Finishing: the prepared low-hardness optical fiber panel blank board section is subjected to rounding, cutting and end face grinding and polishing operations to process a low-hardness optical fiber panel blank, and the low-hardness optical fiber panel blank is subjected to size processing to process a low-hardness optical fiber panel. The low-hardness core material glass rod is prepared from a low-hardness core material glass; The low-hardness core material glass comprises the following components in weight percentage: SiO2 12-16%, Al2O3 1-5%, B2O3 20-32%, MgO 0.5-3%, CaO 2-4%, BaO 0-5%, La2O3 22-30%, Nb2O5 5-6%, Ta2O5 2-3%, ZnO 1-4%, TiO2 1-2%, ZrO2 3-5%, Na2O 1-2%, K2O 4-8%.

2. The preparation method of the low-hardness optical fiber panel suitable for seal carving according to claim 1, wherein: The preparation method of the low-hardness core material glass rod comprises the following steps: (1) Put quartz sand, aluminum oxide, boric acid, magnesium oxide, calcium oxide, barium oxide, lanthanum oxide, niobium oxide, tantalum oxide, zinc oxide, titanium dioxide, zirconium oxide, sodium oxide and potassium oxide into a platinum gold crucible according to the batching requirements; (2) melting at the first preset temperature for the first preset time, and stirring 1-2 times during the melting process, each time for 10-12 hours, at a stirring speed of 3-5 revolutions per minute, and then cooling to the second preset temperature and clarifying for the second preset time; (3) pouring the clarified glass melt through the material outlet to form a glass rod in the mold; (4) annealing the formed glass rod in an annealing furnace, keeping at the third preset temperature for the third preset time, then cooling from the third preset temperature to the fourth preset temperature for the fourth preset time, and then cooling to room temperature with the furnace, to obtain a low-hardness core material glass rod.

3. The method according to claim 2, wherein: the first preset temperature is 1500-1600℃; the first preset time is 4-8 hours; the second preset temperature is 1300-1350℃; and the second preset time is 1-2 hours. the third preset temperature is 600-650℃; the third preset time is 0.8-1.2 hours; the fourth preset time is 11-13 hours; and the fourth preset temperature is 50-70℃.

4. The method for preparing a low-hardness optical fiber panel suitable for seal engraving according to claim 3, characterized in that:

5. The method according to any one of claims 1-4, wherein: the low-hardness skin material glass tube is prepared from low-hardness skin material glass; and the low-hardness skin material glass comprises the following components in the following weight percentages: SiO2 45-55%, B2O3 20-28%, Al2O3 4-5%, MgO 0.5-1.5%, Na2O 1.5-3%, K2O 10-15%, Li2O 0-2%, CaO 0.5-1%, ZnO 0-1.5%, TiO2 1-2%, and ZrO2 4-5%.

6. The method according to claim 5, wherein: the method for preparing the low-hardness skin material glass tube comprises the following steps: (1) placing quartz sand, boric acid, aluminum oxide, magnesium oxide, sodium oxide, potassium oxide, and lithium oxide, and introducing calcium oxide, zinc oxide, titanium dioxide, and zirconium dioxide into a platinum crucible according to the batching requirements; (2) melting at the fifth preset temperature for the fifth preset time; (3) drawing the melted glass melt into a tube through a tube drawing machine; (4) annealing the formed glass tube in an annealing furnace, keeping at the sixth preset temperature for the third preset time, then cooling from the sixth preset temperature to the fourth preset temperature for the sixth preset time, and then cooling to room temperature with the furnace, to obtain a low-hardness skin material glass tube. the fifth preset temperature is 1350-1450℃; the fifth preset time is 6-9 hours; the sixth preset temperature is 500-550℃; and the sixth preset time is 9-11 hours. obtained according to any one of the preparation methods of claims 1-7.

9. Use of the low-hardness fiber panel of claim 8 in seal carving.

7. The low durometer optical fiber faceplate suitable for engraving according to claim 6, wherein: ​ 8. A low durometer optical fiber faceplate suitable for engraving, characterized by: ​ ​

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