JP2011084427A - Method for producing glass molding and cleaning apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a glass molding and a cleaning apparatus which even when glass with a wider composition range, particularly glass with a low glass transition temperature (Tg) is press-molded, suppress degradation in quality of the resulting glass molding. <P>SOLUTION: In the method for producing a glass molding L from stock glass G in a glass molding system 2, a heat-treated cleaning gas is supplied to the glass molding system 2. A heat treating means 12 may be used for heat treatment. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for producing a glass molded body and a cleaning device.

  Conventionally, a glass molded body has been manufactured by polishing glass cut out from plate glass, polishing it into a shape approximate to a glass molded body, and heat-molding the polished product. However, when producing an optical element such as a lens, this method increases the polishing cost of the glass material. Therefore, a method of forming an optical element such as a lens by press-molding the raw glass using a mold is used.

  Here, as an apparatus for press-molding the raw glass, for example, the raw glass is placed between the upper mold and the lower mold of the mold, and the molding die and the raw material are used by using heating means installed in the upper mold and the lower mold. An apparatus that heats glass and performs press molding is known (see Patent Document 1). There is also known an apparatus that provides a mechanism for adjusting the temperature of the atmosphere around the mold and performs press molding in an atmosphere in which the temperature is adjusted (see Patent Document 2).

Japanese Patent Laid-Open No. 06-016435 Japanese Patent Laid-Open No. 08-277128

  However, in the apparatuses disclosed in Patent Document 1 and Patent Document 2, fine irregularities are likely to occur on the surface of the glass molded body after press molding. This unevenness is often generated particularly when a glass having a low glass transition point (Tg) is press-molded, and the quality of the press-molded glass molded body is significantly lowered. In particular, the unevenness of the surface of the glass molded body is a serious problem when the glass molded body is used as it is as an optical element as in precision press molding.

  The present invention has been made in view of the above-mentioned problems, and the object of the present invention is to provide glass even when press-molding glass having a wider range of composition, particularly glass having a low glass transition point (Tg). It is providing the manufacturing method and cleaning apparatus of a glass molded object which can suppress the quality fall of a molded object.

  In order to solve the above-mentioned problems, the present inventors have conducted earnest test research, and as a result, by supplying the heat-treated cleaning gas to the glass forming system, the dust is removed from the atmosphere when the raw glass is press-molded. It has been found that impurities such as dust and dust are reduced, and the present invention has been completed. More specifically, the present invention provides the following.

  (1) A manufacturing method for manufacturing a glass molded body from raw glass in a glass forming system, wherein the heating gas is supplied to the glass forming system.

(2) The heat treatment is performed at a temperature higher than the press molding temperature of the raw glass,
The manufacturing method according to (1), wherein the cleaning gas is supplied to a press forming apparatus included in the glass forming system.

  (3) The said heat processing is a manufacturing method of (1) or (2) description performed at the temperature of 400 degreeC or more.

  (4) The manufacturing method according to (3), wherein the heat treatment is performed at a temperature of 700 ° C. or lower.

  (5) The manufacturing method according to any one of (1) to (4), wherein the gas in the glass forming system is recovered and subjected to the heat treatment, and then supplied to the glass forming system.

  (6) The manufacturing method according to any one of (1) to (5), wherein a gas supplied to the glass forming system is filtered before or after the heat treatment.

  (7) An optical element comprising a glass molded body produced by the production method according to any one of (1) to (6).

  (8) An optical apparatus using the optical element according to (7).

  (9) A cleaning device that cleans the inside air of a glass forming system that manufactures a glass molded body from raw glass, the channel being in communication with the glass forming system and through which the gas flows. A cleaning apparatus comprising: heat treatment means for performing heat treatment on gas; and supply means for supplying the glass forming system with the cleaning gas heat-treated by the heat treatment means.

  (10) The cleaning device according to (9), wherein the flow path is communicated with a press forming apparatus included in the glass forming system.

  (11) The cleaning apparatus according to (9) or (10), wherein the heat treatment means includes a temperature adjustment means for adjusting a temperature of the heat treatment.

  (12) The cleaning device according to any one of (9) to (11), further including a gas circulation unit that recovers the gas in the glass forming system and introduces the gas into the heat treatment unit.

  (13) The cleaning device according to any one of (9) to (12), further including a filtering unit that is provided upstream or downstream of the heat treatment unit and filters the gas flowing through the flow path.

  (14) A molded body manufacturing system comprising: the cleaning device according to any one of (9) to (13); and a glass molding system that cleans the inside air in the cleaning device and manufactures a glass molded body from raw glass. .

  According to the present invention, by supplying the heat-treated cleaning gas to the glass forming system, impurities such as dust and dust are reduced from the atmosphere when the raw glass is press-molded. Even when the glass having Tg) is press-molded, impurities mixed in the glass can be reduced. Therefore, even in a glass having a wider range of composition, it is possible to suppress the quality deterioration of the glass molded body.

It is a top view which shows a preferable example of the molded object manufacturing system in embodiment of this invention. It is sectional drawing which shows a preferable example of the molded object manufacturing system in embodiment of this invention.

  The glass molded body manufacturing method of the present invention is a manufacturing method for manufacturing a glass molded body from raw glass in a glass molding system, and supplies the heat-treated cleaning gas to the glass molding system.

  The cleaning device of the present invention is a cleaning device for cleaning the inside air of a glass forming system that manufactures a glass molded body from raw glass, and includes a flow path that communicates with the glass forming system and through which gas flows. And a heat treatment means for performing a heat treatment on the gas flowing through the flow path, and a supply means for supplying the cleaning gas heat-treated by the heat treatment means to the glass forming system.

  Hereinafter, embodiments of the glass molded body and the optical element manufacturing method and the optical element manufacturing apparatus of the present invention will be described in detail. However, the present invention is not limited to the following embodiments, and the present invention is not limited thereto. Within the range of the objective, it can implement by changing suitably. In addition, although description may be abbreviate | omitted suitably about the location where description overlaps, the meaning of invention is not limited.

<Embodiment>
In one embodiment of the present invention, a molding body manufacturing system 1 having a cleaning device 10 and a glass molding system 2 is used, and a molding die 3 having an upper die 31 and a lower die 32 is heated and press-molded. To form a glass molded body. FIG. 1 is a plan view showing a preferred example of a molded body manufacturing system. Moreover, FIG. 2 is sectional drawing which shows a preferable example of a molded object manufacturing system.

[Cleaning equipment]
For example, as shown in FIG. 2, the cleaning device 10 includes a heat treatment means 12 that heat-treats the gas A1, a flow path 14 that communicates with the glass forming system 2 and through which the gas flows, and the heat-treated gas A1. Supply means 13 for supplying (cleaning gas A2) to the glass forming system 2. Thereby, impurities such as dust and dust contained in the gas A1 are reduced, and the cleaning gas A2 with reduced impurities is supplied to the glass forming system 2. Therefore, even when the raw glass G having a low glass transition point (Tg) is press-molded, impurities mixed into the glass molded body L can be reduced.

  For example, as shown in FIG. 2, the heat treatment means 12 includes a heater 121 provided so as to surround a part or all of the flow path 14, and a temperature adjustment means 122 as necessary. Thereby, since the temperature of the heat treatment is adjusted while the gas A1 flowing through the flow path 14 is heat-treated, impurities such as dust and dust contained in the gas can be more reliably reduced.

  Here, the heater 121 may be of any type as long as it has an effect of directly or indirectly heating the gas A1 flowing through the flow path 14. For example, infrared heating, a gas burner, an induction coil, a heating wire or the like may be provided adjacent to the outside of the flow path 14, and a heating wire or the like may be provided inside the flow path 14. Further, as the temperature adjusting means 122, a means for adjusting the output of the heater 121 as shown in FIG. 2 can be used. However, the temperature adjusting means 122 is not limited to this. For example, the temperature adjusting means 122 is provided in the flow path 14 upstream and / or downstream from the heater 121. A valve (not shown) may be provided to adjust the amount of gas A1 flowing into the heater 121.

  The supply means 13 includes a power source (not shown) that supplies the heat-treated cleaning gas A2 to the glass forming system 2. Thereby, since the cleaning gas A2 is supplied to the glass forming system 2 according to the movement of the power source, the inside of the glass forming system 2 can be kept clean. Here, as a specific example of the supply means 13, a conventionally known pump or the like can be cited.

  The flow path 14 communicates with the glass forming system 2 from the gas A1 inlet 191 through the heat treatment means 12. Thereby, after gas A1 flows in from the inflow port 191, it distribute | circulates the flow path 14, and is supplied to the glass forming system 2 through the heat processing means 12. FIG. Therefore, the cleaning gas A2 can be supplied to the glass forming system 2. Here, the flow path 14 preferably communicates with a press molding apparatus 20 provided in the glass molding system 2, and is formed inside a molding chamber 23 formed so as to surround the molding die 3 in the press molding apparatus 20. It is more preferable to communicate. Since the flow path 14 communicates with the press molding apparatus 20, the atmosphere surrounding the mold 3 is cleaned, so that the raw glass G can be press molded while keeping the surface of the mold 3 in a cleaner state. In particular, since the flow path 14 communicates with the inside of the molding chamber 23 of the press molding apparatus 20, the inside of the molding chamber 23 is kept clean, so that the surface of the molding die 3 is more efficiently kept clean. However, the amount of the cleaning gas A2 to be made can be reduced. At this time, as shown in FIG. 2, the molding chamber 23 may be able to be shut off and opened as necessary with a shutter S or the like.

  The position where the flow path 14 of the cleaning device 10 communicates with the glass forming system 2 is not particularly limited as long as it is a position communicating with the atmosphere surrounding the mold 3. For example, the press forming apparatus 20 is provided and sealed. You may communicate with sealed space, such as a clean room, which exists in the state which can be solved temporarily.

  In particular, when the cleaning device 10 communicates with a sealed space such as the molding chamber 23 or the clean room, the cleaning device 10 collects the gas from the inside of the glass forming system 2 and circulates it. , 183 and a discharge port 192 for discharging the gas (exhaust gas A3) to the outside. As a result, while the cleaning gas A2 is supplied from the cleaning device 10, the exhaust gas A3 is recovered through the recovery passages 181 and 183, and is discharged to the outside through the discharge port 192. For this reason, it is possible to suppress the molding chamber and the sealed space from being pressurized more than necessary, and it is possible to reduce damage to the molding chamber 23 and the sealed space due to the molding chamber 23 and the sealed space being in a pressurized state. Further, impurities brought into the glass forming system 2 together with the forming die 2 and chips generated by pressing the forming die can be discharged out of the glass forming system 2 together with the exhaust gas A3. Here, the recovery flow paths 181 and 183 and the discharge port 192 may be provided integrally with the cleaning device 10 or may be provided independently of the cleaning device 10.

  When the recovery channel 181 is provided, the cleaning device 10 preferably further includes a gas circulation unit 182 for reintroducing at least a part of the exhaust gas A3 recovered in the recovery channel 181 into the heat treatment unit 12. As a result, the exhaust gas A3 is reused as the gas A1, and the reused exhaust gas A3 is cleaned and reintroduced into the glass forming system 2, so that the amount of the gas A1 to be supplied through the inlet 191 is reduced. it can. At this time, it is more preferable to include a valve 172 for changing the ratio of the exhaust gas A3 introduced into the gas circulation means 182 and a valve 171 for adjusting the flow rate to the supply means 13. By providing the valves 171 and 172, the ratio of the exhaust gas A3 introduced into the gas circulation means 182 and the supply amount of the cleaning gas A2 through the supply means 13 are adjusted. Therefore, the amount of exhaust gas A3 to be reused can be adjusted using the gas circulation means 182 in accordance with the flow rate of the cleaning gas A2 supplied to the glass forming system 2.

  At this time, it is more preferable that a storage unit 16 capable of storing the cleaning gas A2 is provided between the valve 171 and the heat treatment unit 12. At this position, the storage means 16 capable of storing the cleaning gas A2 is further provided, so that the gas A1 containing the exhaust gas A3 is introduced into the gas circulation means 182 and cleaned, but the excess cleaning is performed. Gas A2 is stored in the storage means 16. Therefore, the exhaust gas A3 can be reused at a desired flow rate regardless of the flow rate of the cleaning gas A2 supplied to the glass forming system 2.

  The above-described cleaning device 10 preferably includes the filtering means 11 on the flow path 14 upstream or downstream of the heat treatment means 12. By using this to filter the gas A1 before heat treatment and / or the cleaning gas A2 after heat treatment flowing through the flow path 14, the cleanliness of the cleaning gas A2 supplied to the glass forming system 2 is increased. Therefore, the surface of the mold 3 can be kept in a cleaner state. Here, specific examples of the filtering unit 11 include an air filter such as a HEPA filter (High Efficiency Particulate Air Filter) and an ULPA filter (Ultra Low Penetration Air Filter).

  In addition, the cleaning device 10 preferably includes a cooling unit on the flow path 14 downstream of the heat treatment unit 12. Thereby, since the temperature of cleaning gas A2 becomes low, the influence by the heat of cleaning gas A2 supplied to the mold 3 can be reduced, and the glass molded body L after press molding can be smoothly cooled. . Moreover, when press-molding with respect to the raw material glass G with a low glass transition point, softening of the glass molded object L by the heat | fever of cleaning gas A2 can be reduced. Here, the cooling means can use a known water-cooling or air-cooling mechanism, but is not limited to this, for example, as shown in FIG. 2, using the storage means 16 capable of storing the cleaning gas A2, The cleaning gas A2 may be temporarily stored and allowed to cool.

[Glass forming system]
The glass forming system 2 is provided in communication with the cleaning device 10 and manufactures a glass formed body L from the raw glass G. More specifically, as shown in FIGS. 1 and 2, a press molding apparatus 20 having a heating means 22 for heating the raw glass G and a pressing means 21 for pressing the raw glass G is provided, and is molded therein. Although what provided the type | mold 3 is mentioned, it is not limited to this.

  The heating means 22 heats the mold 3. Thereby, since the raw material glass G is softened through the shaping | molding die 3, it can shape | mold in the shape along the inner surface of the shaping | molding die 3 by pressing the raw material glass G. Here, the heat source of the heating means 22 is not particularly limited as long as the mold 3 can be heated to the forming temperature of the raw glass G. For example, infrared heating, a gas burner, an induction coil, a heating wire, or the like can be used. . Further, the position where the heat source of the heating means 22 is provided is not particularly limited as long as the mold 3 can be heated. For example, the heat source 22 may be provided on the lower side of the mold 3 as shown in FIG. May be.

  The pressing means 21 presses and press-molds the raw glass G heated and softened by the heating means 22 and press-molds the raw glass G into a desired shape. In FIG. 2, the pressing surface 211 adjacent to the upper mold 31 of the molding die 3 in the pressing means 21 has a shape that can press the upper mold 31 with an equal force in the horizontal direction, and more specifically, the upper mold. A horizontal surface that covers the upper surface of 31 is used.

  The mold 3 used in the glass molding system 2 has an upper mold 31 and a lower mold 32, and the upper mold 31 and the lower mold 32 have molding surfaces 36 and 37, respectively. The shape and material of the mold 3 are appropriately set according to the shape of the glass molded body L, the hardness of the glass, the glass transition point (Tg), and the like. A body mold 33 may be provided so as to surround the upper mold 31 and the lower mold 32. Here, it is preferable that the molding surfaces 36 and 37 of the upper mold 31 and the lower mold 32 have protective films (not shown) on the surfaces. Thereby, since the impurities adhering to the protective film are reduced, friction between the protective film and the impurities at the time of glass molding can be reduced, and the life of the protective film can be extended.

  In addition to the press molding apparatus 20, the glass molding system 2, for example, supplies raw glass G, discharges the glass molded body L, and assembles and / or disassembles the upper mold 31 and the lower mold 32 into the molding mold 3. Means. Here, the means for supplying the raw glass G and discharging the glass molded body L can be appropriately selected according to the size of the raw glass G, the shape of the molding die 3, and the like. Thus, the raw glass G can be adsorbed and held. The means for assembling and / or disassembling the upper mold 31 and the lower mold 32 into the molding mold 3 is not particularly limited. For example, a holding arm (not shown) is used and the upper mold 31 is held by its holding force. It can be detached from the lower mold 32.

[Molded body manufacturing system]
The molded body manufacturing system 1 used in the present embodiment includes the above-described cleaning device 10 that cleans the gas A1, and the above-described cleaning device 10 that cleans the inside air and forms the glass molded body L from the raw glass G. The glass forming system 2 is provided. Thereby, since the glass molded object L is formed in the state by which the inside air was cleaned by the cleaning apparatus 10, even if it is a case where the glass which has a low glass transition point (Tg) is continuously press-molded, glass Impurities mixed in can be reduced. Therefore, even if glass having a wider range of composition is used, a glass molded body L in which deterioration in quality due to surface irregularities or the like is suppressed can be continuously formed.

<Method for producing glass molded body>
The manufacturing method of the glass forming body which concerns on one Embodiment of this invention is demonstrated using FIG.1 and FIG.2, referring the above-mentioned glass forming system. In this glass molded body manufacturing method, the glass molded body L is formed from the raw glass G while supplying the heat-treated cleaning gas A2 to the glass molding system 2.

  The gas A1 supplied to the cleaning device 10 is appropriately selected from gases that hardly undergo chemical changes such as thermal decomposition even when heated to the above heat treatment temperature, and that do not adversely affect the flow path 14 and the mold 3. For example, air, nitrogen, argon or the like is used. By using these gases, the heat treatment of the gas A1 is facilitated and impurities due to the gas A1 are difficult to be generated. Therefore, it is possible to more efficiently attach impurities such as dust and dust to the mold 3. Can be reduced.

  The heat treatment temperature when the heat treatment means 12 performs the heat treatment on the gas A1 is preferably adjusted to 400 ° C. or higher using the temperature adjustment means 122. Thereby, since the organic substance contained in the gas A1 and difficult to remove with a filter is decomposed, impurities contained in the gas can be more reliably reduced. On the other hand, it is preferable to adjust the heat treatment temperature of the gas A1 to a temperature of 700 ° C. or lower. Thereby, since the temperature difference between the heat treatment temperature and the press molding temperature is reduced, abnormal heating of the molding die 3 when the cleaning gas A2 is fed into the press molding apparatus 20 can be reduced. The heat treatment temperature of the gas A1 is preferably 400 ° C., more preferably 430 ° C., most preferably 450 ° C., preferably 700 ° C., more preferably 680 ° C., and most preferably 650 ° C. However, the heat treatment temperature of the gas A1 is higher than the press molding temperature of the raw glass G in that impurities that are mixed specifically during press molding of a glass having a low glass transition point (Tg) can be reduced. It is preferable that

  The “heat treatment temperature” referred to in the present application refers to the temperature of the cleaning gas A2 inside the heat treatment means 12 or immediately after leaving the heat treatment means 12. This “heat treatment temperature” can be measured by, for example, a thermocouple.

  Next, the cleaning gas A <b> 2 heated by the heat treatment means 12 is supplied to the glass forming system 2. Here, the cleaning gas A2 is preferably supplied to the press molding apparatus 20 of the glass molding system 2 in that the atmosphere in the vicinity of the mold 3 can be more easily cleaned. In particular, when the cooling means 16 is used, the temperature of the cleaning gas A2 supplied from the cooling means 16 is preferably (Tg-0) ° C., more preferably based on the glass transition point (Tg) of the raw glass G. Has an upper limit of (Tg-30) ° C, and most preferably (Tg-50) ° C. Thereby, the heating temperature of the portion heated by the cleaning gas A <b> 2 supplied from the cleaning device 10 does not easily exceed the glass transition point (Tg) of the raw glass G. Therefore, thermal deformation of the raw material glass G due to abnormal heating with the cleaning gas A2 can be reduced. On the other hand, the temperature of the cleaning gas A2 is preferably (Tg−200) ° C., more preferably (Tg−180) ° C., most preferably (Tg) based on the glass transition point (Tg) of the raw glass G. -170) C is the lower limit. Thereby, the shaping | molding die 3 becomes difficult to be rapidly cooled by the cleaning gas A2 supplied from the cleaning apparatus 10. Therefore, the crack by the rapid temperature change of the raw material glass G can be reduced.

  In parallel with the supply of the cleaning gas A2 to the glass forming system 2, the glass forming body L is formed from the raw glass G on the glass forming system 2 side. More specifically, after the mold 3 in which the raw glass G is supplied onto the lower mold 32 is supplied to the press molding apparatus 20 and the raw glass G is softened using the heating means 22 and the pressing means 21. After press molding, the mold 3 is taken out from the press molding apparatus 20. Thereby, press molding of the raw material glass G is sequentially performed while the cleaning gas A2 is supplied to the glass molding system 2. Therefore, the glass molded body L can be continuously formed using glass having a wider range of composition as a raw material while reducing impurities mixed in the glass.

[Production of optical elements and optical equipment]
It is preferable to produce optical elements such as lenses and prisms from the glass molded body L molded by the molded body manufacturing system 1 described above. It is also preferable to manufacture an optical device such as a camera or a projector using the optical element manufactured here. Thereby, since the glass molded object L is press-molded with high precision, the optical apparatus provided with the optical element which has desired optical performance can be obtained. In addition, the glass molded body L shape | molded by this application is not restricted to the use of an optical element, For example, you may use for uses, such as a board | substrate for information recording media, such as a hard disk, and an optical filter.

  EXAMPLES Hereinafter, although this invention is demonstrated further in detail using an Example, this invention is not limited to a following example.

  As the cleaning device, a gas inflow port, a filtration unit, a heat treatment unit, a cooling unit, and a supply unit were sequentially communicated through a flow path. Here, as the heat treatment means, a heater made of a heating wire provided so as to surround the flow path and a temperature adjusting means for adjusting the output of the heating wire were used. Further, a HEPA filter was used as the filtering means, and a tank capable of storing the cleaning gas was used as the cooling means. A valve for adjusting the flow rate of the cleaning gas was provided between the cooling means and the supply means.

  This cleaning device was configured to communicate with the molding chamber of the press molding device via the flow path from the supply means. On the other hand, the molding chamber of the press molding apparatus was also provided with a discharge port communicating with the inside. The exhaust port is provided with a valve for distributing the recovered exhaust gas to the outside and the gas circulation means, and the gas circulation means is communicated with a flow path connected to the filtration means.

  Here, the press molding apparatus is configured to include a heating unit that heats the raw glass with an induction coil from the lower side of the molding die and a pressing unit that presses the raw glass, and a heating stage, A pressing stage and a cooling stage were sequentially provided. At this time, the molding chamber of the press molding apparatus can be shut off and opened as necessary with a shutter to facilitate loading and unloading of the mold.

  As press molds, cylindrical upper and lower molds each having a diameter of 16 mm and a height of 12 mm and made of WC were used. The upper mold and the lower mold were each provided with a molding surface composed of spherical surfaces having a diameter of 16 mm and a depth of 10.5 mm so as to face each other. A cylindrical body mold having an outer diameter of 20 mm, an inner diameter of 16 mm, and a height of 24 mm was provided adjacent to and surrounding these upper mold and lower mold.

  This mold is supplied to a predetermined position of the press molding apparatus, the upper mold is lifted using a holder, and raw glass (glass transition point: 366 ° C.) is supplied to the lower mold, and the upper mold is used as the lower mold. The upper mold and the lower mold were assembled into a mold.

  Dry air was introduced from the inlet of the cleaning device, and the introduced dry air was heat-treated by heat treatment means. At that time, the temperature near the outlet of the heat treatment means (heat treatment temperature) is measured with a thermocouple (model number: SCHI-0, manufactured by CHINO), and the temperature is adjusted to 520 ° C. based on the measured value. It adjusted so that it might become. Next, the heat-treated cleaning gas was supplied to the cooling means, and stored in the cooling means until the temperature of the cleaning gas reached 200 ° C. Then, the stored cleaning gas was supplied to the molding chamber of the press molding apparatus.

  When the inside of the molding chamber was sufficiently cleaned, this mold was supplied into the molding chamber of the press molding apparatus in parallel with the supply of the cleaning gas to the glass molding system. The mold moved to the press molding apparatus moved on the heating stage, and the raw glass was heated to a press molding temperature of 386 ° C. and softened. Then, when the mold reached a predetermined position on the pressing stage, the movement of the mold was stopped, the upper mold was lowered using the pressing means, the raw glass was pressed, and the glass was press-molded.

  After press molding, the mold was further moved, and the mold was gradually cooled while being sequentially moved on the cooling stage. The molding die taken out of the molding chamber after passing through the cooling stage was disassembled into an upper die and a lower die, and a glass molded body was taken out. The surface roughness (Rmax) of the obtained glass molded body was measured with a roughness meter (model number: Maxim 5700, manufactured by Zygo).

  As a comparative example, the same test as in the example was also performed when no cleaning device was provided in the press molding apparatus.

  As a result, when the cleaning device was not provided in the press molding device, the surface roughness (Rmax) of the glass molded body was larger than 0.5 μm (molded defective product) at a rate of about 80%. When the cleaning device was provided in the press molding apparatus, the defective molding of the glass molded body was reduced to about 5%. Comparing the glass molded body L produced in the examples and comparative examples, even when a glass having a low glass transition point (Tg) is press-molded, impurities mixed into the glass are reduced, and thus a wider range. It can be seen that a reduction in the quality of the glass molded body can be suppressed with respect to a glass having a simple composition.

DESCRIPTION OF SYMBOLS 1 Molded body manufacturing system 10 Cleaning apparatus 11 Filtration means 12 Heat processing means 121 Heater 122 Temperature adjustment means 13 Supply means 14 Flow path 16 Cooling means 171, 172 Valve 182 Gas circulation means 191 Inlet 192 Outlet 2 Glass forming system 20 Press molding apparatus 21 Press means 211 Press surface 22 Heating means 23 Molding chamber 3 Mold 31 Upper mold 32 Lower mold 33 Body mold 36 Molding surface 37 Molding surface A1 Gas A2 Cleaning gas A3 Exhaust gas G Raw glass L Glass molding S shutter

Claims (14)

A manufacturing method for manufacturing a glass molded body from raw glass in a glass molding system,
A manufacturing method for supplying a heat-treated cleaning gas to the glass forming system. The heat treatment is performed at a temperature higher than the press molding temperature of the raw glass,
The manufacturing method according to claim 1, wherein the cleaning gas is supplied to a press forming apparatus included in the glass forming system.   The manufacturing method according to claim 1, wherein the heat treatment is performed at a temperature of 400 ° C. or higher.   The manufacturing method according to claim 3, wherein the heat treatment is performed at a temperature of 700 ° C. or less.   The manufacturing method according to any one of claims 1 to 4, wherein a gas in the glass forming system is recovered and subjected to the heat treatment, and then supplied to the glass forming system.   The manufacturing method according to claim 1, wherein a gas supplied to the glass forming system is filtered before or after the heat treatment.   The optical element which consists of a glass forming body manufactured with the manufacturing method in any one of Claim 1 to 6.   An optical apparatus using the optical element according to claim 7. A cleaning device for cleaning the inside air of a glass forming system for producing a glass molded body from raw glass,
A flow path communicating with the glass forming system and through which gas flows;
Heat treatment means for performing heat treatment on the gas flowing through the flow path;
And a supply unit that supplies the cleaning gas heated by the heat processing unit to the glass forming system.   The cleaning apparatus according to claim 9, wherein the flow path is communicated with a press forming apparatus included in the glass forming system.   The cleaning apparatus according to claim 9 or 10, wherein the heat treatment means includes a temperature adjustment means for adjusting a temperature of the heat treatment.   The cleaning apparatus according to any one of claims 9 to 11, further comprising a gas circulation unit that collects gas in the glass forming system and introduces the gas into the heat treatment unit.   The cleaning device according to any one of claims 9 to 12, further comprising a filtering unit that is provided upstream or downstream of the heat treatment unit and filters a gas flowing through the flow path.   A molded body manufacturing system comprising: the cleaning device according to any one of claims 9 to 13; and a glass molding system that cleans the inside air in the cleaning device and manufactures a glass molded body from raw glass.

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