Preparation device for neutral borosilicate pharmaceutical glass tube, and method

Abstract

The present invention relates to the technical field of pharmaceutical glass tube preparation, and provides a preparation device for a neutral borosilicate pharmaceutical glass tube, and a method. The preparation device provided by the present invention comprises a melting system, a forming system, and a cutting system. The forming system comprises a muffle furnace, a shaping furnace, and an annealing furnace which are vertically arranged from top to bottom. In an annular gap between a material chute and a guide pipe in the muffle furnace and the inner wall of a furnace body channel, molten glass is pushed downward under the gravity of the molten glass and the thrust of the annular gap, to enter the shaping furnace. A tube pulling system is provided with traction rollers and guide clamping rings for clamping and positioning glass tubes. The traction rollers clamp a glass melt to enable the glass melt to be continuously drawn under the combined action of the gravity of the glass melt and the autorotation force of the traction rollers, so as to form a glass tube. The glass tube prepared by the device has a uniform thickness, the whole preparation process is simple, the complex process is avoided and the internal and external quality of the glass tube is also guaranteed, the preparation device of the present invention has a simple structure and is convenient to maintain, and the cost and the energy consumption are further reduced.

Description

A device and method for preparing medium-borosilicate pharmaceutical glass tube Technical Field

[0001] The present invention relates to the technical field of preparation of medicinal glass tubes, and in particular to a preparation device and method for medium-borosilicate medicinal glass tubes. Background Art

[0002] As the direct carrier of pharmaceuticals, pharmaceutical packaging materials bear a crucial responsibility for ensuring drug quality and safety. Glass, with its smooth, transparent appearance, easy disinfection, and excellent sealing properties, has proven itself as the preferred packaging material in the pharmaceutical industry over nearly a century of application. Medium-borosilicate glass, in particular, offers superior impact resistance and chemical stability, making it internationally recognized as the safest pharmaceutical packaging material and widely used in packaging for high-end infusions, antibiotics, lyophilized solutions, vaccines, and biologics.

[0003] Medium-borosilicate pharmaceutical glass is manufactured through secondary processing of medium-borosilicate glass tubes. The technology behind the drawing of medium-borosilicate tubes has become a key competitive advantage in producing medium-borosilicate tube bottles. Currently, the mainstream methods for producing medium-borosilicate glass tubes are the Dana method and the Vero method. The Vero method requires a taller plant and consumes more energy and capital, while the Dana method is more widely used. However, the lifespan of the rotating tube in the Dana method limits production efficiency, and regular replacement and maintenance inevitably increase production costs. Technical issues

[0004] The tube drawing equipment used in the production process for preparing pharmaceutical glass tubes requires frequent replacement of consumables and regular maintenance. Technical Solutions

[0005] In order to solve the problem that the tube drawing equipment used in the production process of preparing pharmaceutical glass tubes needs frequent replacement of consumables and regular maintenance, the present invention provides a device and method for preparing medium-borosilicate pharmaceutical glass tubes.

[0006] To achieve the above objectives, the following technical solutions are adopted:

[0007] A device for preparing a medium-borosilicate pharmaceutical glass tube, comprising:

[0008] The melting system includes a melting zone and a clarification zone arranged in sequence; the melting zone is used to melt the batch material into glass liquid and then feed it into the clarification zone; the clarification zone is used to bubble and homogenize the glass liquid, stir and remove bubbles, and feed the glass liquid into the material tank of the molding system through the feed pipe;

[0009] The forming system includes a muffle furnace, a shaping furnace, and an annealing furnace arranged vertically from top to bottom. The muffle furnace includes a material trough, which is in the shape of an inverted frustum. A guide tube is provided below the material trough, extending from the muffle furnace to the lower end of the shaping furnace. A furnace body channel is provided outside the material trough and the guide tube in the muffle furnace. The furnace body channel is coaxial with the material trough and the guide tube to form an annular gap. Several groups of pulling rollers and several guide clamping rings are provided in the shaping furnace for clamping and positioning the glass tube. The pulling rollers are provided on a clamping transmission mechanism bracket. The clamping transmission mechanism bracket and the guide clamping rings are both provided on the furnace wall of the positioning furnace and connected to an external servo motor. Several groups of pulling rollers and several guide clamping rings are also provided on the upper part of the annealing furnace.

[0010] The cutting system is arranged below the forming system and is used to cut the formed and annealed glass tubes into the required lengths.

[0011] It also includes an online detection system, which is placed at the exit of the annealing furnace and is used for real-time monitoring and feedback of the glass tube diameter and glass tube status.

[0012] The side surface of the pulling roller is a rotating curved surface. Several pulling rollers are arranged in a group at the same level in the shaping furnace. The generatrix of the rotating curved surfaces of the several pulling rollers can form a ring to wrap the glass tube.

[0013] The outer parts of the muffle furnace, the shaping furnace and the upper part of the annealing furnace are all provided with heating devices; the outer parts of the muffle furnace and the shaping furnace are also provided with temperature measuring devices, and the outer part of the annealing furnace is provided with a temperature measuring device according to the temperature gradient in the furnace.

[0014] The depth of the barrel in the trough is not less than 1 / 2 of the total height of the trough and not greater than the total height of the trough.

[0015] Positioning wheels are fixed on both ends of the traction roller.

[0016] The minimum diameter of the furnace body channel is 2-30 mm larger than the diameter of the bottom of the material trough.

[0017] The melting zone includes a furnace, a flue is arranged on the upper part of the front wall of the furnace, and a feeding port is arranged on the lower part of the front wall of the furnace; the heating electrodes are arranged in a pool wall side pile type, burners are arranged on both sides of the furnace breast wall, and a discharge port is arranged at the bottom of the furnace.

[0018] The clarification zone includes a clarification channel and a homogenizing tank. The clarification channel connects the melting furnace and the homogenizing tank. A stirring device, a bottom bubbling device and a discharge port are provided in the homogenizing tank. The bottom bubbling device is used to bubble into the glass liquid to promote clarification of the glass liquid. The stirring device is used to homogenize the glass liquid. The discharge port is provided at the bottom of the homogenizing tank.

[0019] A method for preparing a medium-borosilicate pharmaceutical glass tube using the above-mentioned preparation device comprises the following steps:

[0020] The batch material is put into the furnace for high temperature glass melting. The viscosity of the glass liquid is 10 2 -10 2.3 dPa▪s;

[0021] After melting, it is sent to the homogenizing tank for glass clarification, bubble removal and homogenization. The viscosity of the glass liquid during clarification and homogenization is 10 2.5 -10 3 dPa▪s;

[0022] The glass liquid is fed into the muffle furnace through the feeding pipe. When the trough is full of glass liquid, it overflows from the circular top of the trough at the same time. Along the outer edge of the trough, the annular gap formed by the furnace channel and the trough makes the glass liquid flow downward evenly. The diameter of the glass tube gradually decreases to , and then enters the shaping furnace; it is clamped by several groups of traction rollers and several guide clamping rings. Under the uniform pulling force of the traction rollers and the weight of the glass, it is pulled along the tube drawing system to form a hollow and slender glass tube with uniform thickness; the viscosity of the glass tube forming drawing is 10 4 -10 4.3 dPa▪s;

[0023] Enter the annealing furnace to complete annealing to eliminate stress. The stress elimination viscosity of the glass tube is not less than 10 9 dPa▪s;

[0024] The annealed glass tube is sent to the cutting device, cut according to the preset size, and then inspected and packaged. Beneficial effects

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The device for preparing medium-borosilicate pharmaceutical glass tubes provided by the present invention has an annular gap between the material trough and the guide tube and the inner wall of the furnace body channel in the muffle furnace. The glass liquid is pushed downward by its own gravity and the pushing force of the annular gap and enters the shaping furnace. The tube drawing system is provided with a pulling roller and a guide clamping ring to clamp and position the glass tube. The glass melt is continuously pulled to form a glass tube under the combined action of its own gravity and the self-rotation force of the pulling roller. The entire preparation process is simple, avoiding complicated processes while ensuring the quality of the inside and outside of the glass tube. The preparation device of the present invention has a simple structure, is easy to maintain, and reduces cost and energy consumption.

[0027] Furthermore, the preparation device of the present invention is provided with a clarification channel for the first clarification, and the clarification homogenization tank is provided with a bubbling device for the second clarification. The two-stage clarification is provided, which is more beneficial to the clarification of the glass liquid; the side surface of the traction roller is a rotating curved surface forming a circular ring to clamp the glass melt, and the glass melt is subjected to uniform traction force, thereby ensuring that the thickness of the prepared glass tube is uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments:

[0029] FIG1 is a schematic structural diagram of an apparatus for preparing a medium-borosilicate pharmaceutical glass tube according to the present invention;

[0030] FIG2 is a schematic diagram of the structure of the traction roller in the pipe drawing system of the device of the present invention;

[0031] FIG3 is a schematic diagram of the installation of the pulling roller in the pipe drawing system of the device of the present invention;

[0032] FIG4 is a schematic diagram of the layout of the pulling rollers in the pipe drawing system of the device of the present invention;

[0033] FIG5 is a schematic diagram of the structure of the guide clamping ring in the tube drawing system of the device of the present invention;

[0034] In the figure: 1. furnace; 2. flue; 3. feeding port; 4. heating electrode; 5. burner; 6. homogenizing tank; 7. stirring device; 8. tank bottom bubbling device; 9. feeding pipe; 10. muffle furnace; 11. shaping furnace; 12. material trough; 13. furnace body channel; 14. heating device; 15. temperature measuring device; 16. pulling roller; 17. guide clamping ring; 18. annealing furnace; 19. online detection device; 20. glass tube; 21. pulling roller positioning wheel; 22. clamping transmission mechanism bracket; 23. guide tube. Modes for Carrying Out the Invention

[0035] The present invention will be further described below with reference to the accompanying drawings:

[0036] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0037] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0038] The present invention is described in further detail below with reference to the accompanying drawings:

[0039] As shown in FIG1 , the present invention provides a device for preparing medium-borosilicate pharmaceutical glass tubes, comprising a melting system, a molding system, and a cutting system;

[0040] The melting system is used for glass melting and feeding. Glass melting includes high-temperature melting of raw materials, stirring and removing bubbles, and bubbling and homogenizing. The melting system is horizontally arranged with a melting zone, a clarification zone and a feeding pipe 9 in sequence.

[0041] The melting zone is used to melt the batch materials into molten glass. It includes a furnace 1, which is equipped with a flue 2, a charging port 3, heating electrodes 4, a burner 5, and a discharge port. The flue 2 is located on the upper portion of the front wall of the furnace 1, and the charging port 3 is located on the lower portion of the front wall. The heating electrodes 4 are molybdenum or tin oxide electrodes and are stacked on the side of the tank wall. The burners 5 are located on both sides of the breast wall of the furnace 1. The discharge port is located at the bottom of the furnace 1 and is used to discharge the molten glass and precipitated impurities. The furnace 1 uses all-electric heating or electric-gas heating to heat the batch materials.

[0042] The clarification zone includes a clarification channel and a homogenizing tank 6. Homogenizing tank 6 is equipped with a stirring device 7, a bottom bubbling device 8, and a discharge port. The clarification channel connects the furnace 1 and the homogenizing tank 6. The bottom bubbling device 8 is used to bubble the molten glass to enhance convection and promote clarification. The stirring device 7 is used to homogenize the molten glass. The discharge port is located at the bottom of the homogenizing tank 6 for intermittent discharge of precipitated impurities.

[0043] The feed pipe 9 is used to transport molten glass to the material tank 12 of the molding system. One end of the feed pipe 9 is connected to the bottom flow channel on the side of the clarification area, and the other end is placed above the material tank 12.

[0044] The batch material composed of crushed glass powder and powder is fed into the melting furnace 1 from the feeding port 3, melted into a melt at high temperature, and after being completely melted, enters the clarification area through the clarification channel. The clarified and homogenized glass liquid flows into the material trough 12 of the molding system through the feeding pipe 9.

[0045] The forming system includes a muffle furnace 10, a shaping furnace 11 and an annealing furnace 18 arranged vertically from top to bottom.

[0046] The muffle furnace 10 includes a trough 12, a furnace channel 13, and the upper portion of a guide tube 23. The trough 12 is in the shape of an inverted truncated cone, with an inner barrel depth of no less than half and no greater than the total height of the trough 12. The guide tube 23 is cylindrical and disposed below the trough 12. The guide tube 23 extends from the muffle furnace 10 to the lower end of the shaping furnace 11, with the bottom of the trough 12 and the upper end of the guide tube 23 connected by a circular arc. The upper opening diameter of the furnace channel 13 is larger than the upper cross-sectional diameter of the trough 12. The furnace channel 13 is coaxial with the trough 12 and the guide tube 23, forming an annular gap between the inner wall of the furnace channel 13, the trough 12, and the guide tube 23 within the muffle furnace 10. The diameter of the annular gap gradually decreases from top to bottom and then ceases to change after reaching the guide tube 23. The minimum diameter of the furnace channel 13 is 2-30 mm larger than the diameter of the bottom end of the trough 12.

[0047] As shown in Figures 1-5, the shaping furnace 11 is equipped with a tube drawing system, which includes a pulling roller 16, a guide clamping ring 17, a clamping transmission mechanism bracket 22, and the lower portion of a guide tube 23. The clamping transmission mechanism bracket 22 is mounted on the furnace wall of the shaping furnace 11. The pulling roller 16 is mounted on the clamping transmission mechanism bracket 22 and can rotate on the clamping transmission mechanism bracket 22. Positioning wheels 21 are provided at both ends of the pulling roller 16 to prevent the pulling roller 16 from moving horizontally on the clamping transmission mechanism bracket 22. The clamping transmission mechanism bracket 22 is also connected to a servo motor, which controls and drives the pulling roller 16 on the clamping transmission mechanism bracket 22 to rotate in the direction of glass flow. The side surface of the pulling roller 16 is a rotating curved surface. Several pulling rollers 16 are arranged in a group at the same horizontal height in the shaping furnace 11. The generatrix of the rotating curved surface of several pulling rollers 16 can form a circular ring to wrap the glass tube 20; several groups of pulling rollers 16 clamp the glass melt, so that the glass melt is continuously pulled to form the glass tube 20 under the combined action of its own gravity and the rotation force of the pulling rollers 16; the guide clamping ring 17 is arranged on the furnace wall of the shaping furnace 11 and is connected to an external servo motor. It can be moved according to actual process requirements through the servo motor; several guide clamping rings 17 and the pulling rollers 16 are alternately arranged to play a guiding and positioning role in the stretching process of the glass melt.

[0048] In one embodiment of the present invention, four pulling rollers 16 are arranged in a group to form a ring to wrap the glass tube 20 .

[0049] Several groups of pulling rollers 16 and guide clamping rings 17 are also arranged in the annealing furnace 18 and are centrally arranged at the upper part of the annealing furnace 18.

[0050] As shown in Figure 1, heating devices 14 are evenly arranged on the exterior of the muffle furnace 10 and the shaping furnace 11 to heat and insulate the furnace bodies. The heating devices 14 are also centrally located above the annealing furnace 18, causing the temperature inside the annealing furnace 18 to decrease in a gradient. This is intended to relieve internal stress in the glass and achieve a denser internal structure in the glass tube 20 formed by the tube drawing system. The heating devices 14 are heating rods or heating wires wrapped around the exterior of the furnace bodies. Temperature measuring devices 15 are evenly arranged on the exterior of the muffle furnace 10 and the shaping furnace 11, with temperature measuring devices 15 arranged on the exterior of the annealing furnace 18 along the temperature gradient within the furnace. These temperature measuring devices 15 are thermocouples.

[0051] The online detection system 19 is located at the exit of the annealing furnace 18 and is used for real-time monitoring and feedback of the glass tube diameter and glass tube status.

[0052] The cutting system, located below the forming system, is used to cut the formed and annealed glass tubes 20 to the required length. The cut ends are then flame-rounded or polished flat. The cut glass tubes 20 are then stacked and packaged.

[0053] The method for preparing a medium-borosilicate pharmaceutical glass tube using the above-mentioned device comprises the following steps:

[0054] Weigh the ingredients according to the raw material ratio, add the ingredients into the mixer and mix evenly;

[0055] The mixed batch material is melted in the furnace 1 at high temperature. The viscosity of the glass liquid is 10 2 -10 2.3 dPa▪s;

[0056] After melting, it is sent to the homogenizing tank 6 for glass clarification, bubble removal and homogenization; the viscosity of the glass clarification homogenization is 10 2.5 -10 3 dPa▪s.

[0057] The glass liquid is fed into the muffle furnace 10 through the feeding pipe 9. When the glass liquid in the trough 12 is full, it overflows from the circular top of the trough 12 at the same time. Along the outer edge of the trough 12, the annular gap formed by the furnace channel 13 and the trough 12 makes the glass liquid flow downward with uniform thickness. Along the outside of the trough 12, the diameter of the glass tube 20 gradually decreases, and the diameter of the glass liquid gradually decreases, and enters the shaping furnace 11; it is clamped by several groups of pulling rollers 16 and several guide clamping rings 17 of the tube drawing system. Under the uniform pulling force of the pulling rollers 16 and the weight of the glass, it is pulled along the tube drawing system to form a hollow and slender glass tube with uniform thickness; the viscosity of the glass tube forming drawing is 10 4 -10 4.3 dPa▪s.

[0058] The viscosity of the entry is not less than 10 9 dPa▪s annealing furnace 18 completes annealing to eliminate stress;

[0059] The annealed glass tubes are fed into the cutting device and cut to the preset size before being inspected and packaged. After inspection, they can directly enter the secondary processing of pharmaceutical glass, completing the processing of pharmaceutical glass bottles such as ampoules and cillin.

[0060] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the same. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art may still modify or make equivalent substitutions to the specific implementations of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention are within the scope of protection of the claims of the present invention to be approved.

Claims

1. A device for preparing a medium borosilicate pharmaceutical glass tube, characterized in that: include: The melting system comprises a melting zone and a clarification zone which are arranged in sequence; the melting zone is used to melt the batch material into glass liquid and then feed it into the clarification zone; the clarification zone is used to bubble and homogenize the glass liquid, and stir and remove bubbles, and feed the glass liquid into a material tank (12) of the molding system through a feed pipe (9); A forming system comprises a muffle furnace (10), a shaping furnace (11) and an annealing furnace (18) arranged vertically from top to bottom; the muffle furnace (10) comprises a material trough (12), the material trough (12) is in the shape of an inverted truncated cone, a guide tube (23) is arranged below the material trough (12), the guide tube (23) extends from the muffle furnace (10) to the lower end of the shaping furnace (11), a furnace body channel (13) is arranged outside the material trough (12) and the guide tube (23) in the muffle furnace (10), and the furnace body channel (13) is connected to the material trough (12) and the guide tube (23) are coaxially arranged and form an annular seam; a plurality of groups of traction rollers (16) and a plurality of guide clamping rings (17) are arranged in the shaping furnace (11) for clamping and positioning the glass tube (20); the traction rollers (16) are arranged on a clamping transmission mechanism bracket (22); the clamping transmission mechanism bracket (22) and the guide clamping ring (17) are both arranged on the furnace wall of the positioning furnace (11) and connected to an external servo motor; a plurality of groups of traction rollers (16) and a plurality of guide clamping rings (17) are also arranged on the upper part of the annealing furnace (18); The cutting system is arranged below the forming system and is used to cut the formed and annealed glass tube (20) according to the application fixed length size.

2. The device for preparing a medium borosilicate pharmaceutical glass tube according to claim 1, characterized in that: It also includes an online detection system (19), which is placed at the outlet of the annealing furnace (18) and is used for real-time monitoring and feedback of the glass tube diameter and glass tube status.

3. The device for preparing a medium borosilicate pharmaceutical glass tube according to claim 1, characterized in that: The side surface of the pulling roller (16) is a rotating curved surface. A plurality of pulling rollers (16) are arranged in a group at the same horizontal height in the shaping furnace (11). The generatrix of the rotating curved surfaces of the plurality of pulling rollers (16) can form a circular ring to wrap the glass tube (20).

4. The device for preparing a medium borosilicate pharmaceutical glass tube according to claim 1, characterized in that: A heating device (14) is arranged on the outside of the muffle furnace (10), the shaping furnace (11) and the upper part of the annealing furnace (18); a temperature measuring device (15) is also arranged on the outside of the muffle furnace (10) and the shaping furnace (11); and a temperature measuring device (15) is arranged on the outside of the annealing furnace (18) according to the temperature gradient in the furnace.

5. The device for preparing a medium borosilicate pharmaceutical glass tube according to claim 1, characterized in that: The inner barrel depth of the material trough (12) is not less than 1 / 2 of the total height of the material trough (12) and not greater than the total height of the material trough (12).

6. The device for preparing a medium borosilicate pharmaceutical glass tube according to claim 1, characterized in that: Positioning wheels (21) are fixed at both ends of the traction roller (16).

7. The device for preparing a medium borosilicate pharmaceutical glass tube according to claim 1, characterized in that: The minimum diameter of the furnace channel (13) is 2-30 mm larger than the bottom diameter of the material trough (12).

8. The device for preparing a medium borosilicate pharmaceutical glass tube according to claim 1, characterized in that: The melting zone comprises a furnace (1), a flue (2) is arranged at the upper part of the front wall of the furnace (1), and a feeding port (3) is arranged at the lower part of the front wall of the furnace (1); the heating electrode (4) is arranged in a pool wall side pile type, burners (5) are arranged on both sides of the breast wall of the furnace (1), and a discharge port is arranged at the bottom of the furnace (1).

9. The device for preparing a medium borosilicate pharmaceutical glass tube according to claim 1, characterized in that: The clarification zone comprises a clarification channel and a homogenizing tank (6), the clarification channel connecting the melting furnace (1) and the homogenizing tank (6); a stirring device (7), a tank bottom bubbling device (8) and a discharge port are arranged in the homogenizing tank (6), the tank bottom bubbling device (8) is used to bubble into the glass liquid to promote clarification of the glass liquid, the stirring device (7) is used to homogenize the glass liquid, and the discharge port is arranged at the bottom of the homogenizing tank (6).

10. A method for preparing a medium borosilicate pharmaceutical glass tube using the preparation device according to any one of claims 1 to 9, characterized in that: The following steps are involved: The batch material is put into the melting furnace (1) for high temperature glass melting. The molten glass viscosity is 10 2 -10 2.3 dPa▪s; After melting, it is sent to the homogenizing tank (6) for glass clarification, bubble removal and homogenization. The viscosity of the clarified and homogenized glass liquid is 10 2.5 -10 3 dPa▪s; The glass tube (20) is fed into the muffle furnace (10) through the feeding pipe (9), and when the material trough (12) is full of glass liquid, it overflows from the circular top of the material trough (12) at the same time, flows downward evenly along the outer edge of the material trough (12), and in the annular gap formed by the furnace body channel (13) and the material trough (12), and the diameter of the glass tube (20) is gradually reduced to, and enters the shaping furnace (11); it is clamped by a plurality of groups of traction rollers (16) and a plurality of guide clamping rings (17), and under the uniform pulling force of the traction rollers (16) and the self-weight of the glass, it is pulled along the tube drawing system to form a hollow and slender glass tube with uniform thickness; the viscosity of the glass tube forming drawing is 10 4 -10 4.3 dPa▪s; Enter the annealing furnace (18) to complete annealing to eliminate stress. The stress-eliminating viscosity of the glass tube is not less than 10 9 dPa▪s; The annealed glass tube (20) is fed into a cutting device, cut according to a preset size, and then inspected and packaged.

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