METHOD AND APPARATUS FOR PRODUCING HOLLOW GLASS BODY PRODUCTS, AND HOLLOW GLASS BODY PRODUCTS AND THEIR USE

Abstract

A method for producing a hollow glass body product includes: providing a hollow glass body having an outer surface; forming the hollow glass body product so as to have a first end portion and a second end portion, the first end portion being sealed by a first bottom and the second end portion being sealed by a second bottom; and laser-based irradiating of the hollow glass body with focused laser radiation to produce a plurality of spaced apart filamentary defects in a predetermined arrangement pattern in the outer surface of at least the first end portion, thereby generating a plurality of open passages connecting an interior of the hollow glass body to the outer surface thereof by at least part of the filamentary defects. A diameter of the passages is sized to be less than 50 micrometers and a plurality of the open passages provide gaseous communication to the interior.

Claims

1. A method for producing a hollow glass body product, the method comprising: providing a hollow glass body having an outer surface; forming the hollow glass body product so as to have a first end portion and a second end portion, the first end portion being sealed by a first bottom and the second end portion being sealed by a second bottom; and laser-based irradiating of the hollow glass body with focused laser radiation to produce a plurality of spaced apart filamentary defects in a predetermined arrangement pattern in the outer surface of at least the first end portion, thereby generating a plurality of open passages connecting an interior of the hollow glass body to the outer surface thereof by at least part of the filamentary defects, wherein a diameter of the passages is sized to be less than 50 micrometers and a plurality of the open passages provide gaseous communication to the interior.

2. The method of claim 1, wherein at least part of the filamentary defects form a plurality of open passages providing a total cross-sectional area sufficiently large for at least one of venting or pressure equalization.

3. The method of claim 1, wherein the diameter of each individual passage is sized to be less than 10 micrometers.

4. The method of claim 1, wherein the open passages are arranged along a circumference of the outer surface of the hollow glass body at intervals of at least 7 micrometers.

5. The method of claim 4, wherein the open passages are arranged along a circumference of the outer surface of the hollow glass body at intervals of at least 10 micrometers.

6. The method of claim 1, further comprising, prior to or following the producing of the filamentary defects in the outer surface of the hollow glass body, processing the hollow glass body by heat-soft separating it into predetermined sections, the sections each having a further first end portion and a further second end portion, the first end portion being sealed by forming a first bottom and the second end portion by forming a second bottom.

7. The method of claim 1, further comprising generating, by at least one of at least part of the filamentary defects or open passages, an individual code of the hollow glass body by a freely selectable geometric arrangement pattern of at least one of the filamentary defects or of the open passages in the form of squares, rectangles, parallelograms, circles, ellipses, mixed shapes, or variants of data matrix codes.

8. The method of claim 1, wherein at least one of at least part of the filamentary defects or open passages define an individual code of the hollow glass body by a freely selectable geometric arrangement pattern of at least one of the filamentary defects or of the open passages, including or indicating information about at least one of process parameters, product specification, a type of error, or an error position.

9. The method of claim 1, further comprising generating, by at least one of at least part of the filamentary defects or open passages, a predetermined breaking line for at least one of subsequent separation of the hollow glass body into predetermined sections or for producing an opening in the outer surface of the hollow glass body as a vent opening or as a filling opening.

10. The method of claim 9, wherein at least one of the filamentary defects or the open passages defining the predetermined breaking line are arranged annularly or in the form of a string along a circumference of the hollow glass body.

11. The method of claim 9, wherein at least one of the filamentary defects or the open passages defining the predetermined breaking line are arranged along a circumference of the outer surface of the hollow glass body at intervals of not more than 6 micrometers.

12. The method of claim 9, further comprising forming the predetermined breaking line as a closed line, and causing detachment and removal of a portion of a wall of the hollow glass body along the predetermined breaking line by at least one of a temperature difference or a pressure difference to produce a rather large opening in the outer surface of the hollow glass body.

13. The method of claim 1, further comprising separating the hollow glass body product for further processing, and prior to the separating, generating a pressure difference between the interior of the hollow glass body product and an exterior thereof such that the pressure inside is higher than the pressure in the exterior, wherein the pressure difference is generated by gas exchange through the open passages, to cause particles formed during the separating to be dissipated away from the hollow glass body by escaping over pressure.

14. The method of claim 13, further comprising forming, from the hollow glass body product, hollow glass articles in the form of glass tube vials, glass ampoules, glass cartridges, or glass syringes.

15. The method of claim 1, wherein the hollow glass body product is formed in the shape of a tube.

16. The method of claim 1, wherein the hollow glass body product has a wall thickness of not more than 2.5 mm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0076] The above-mentioned and other features and advantages of this invention, and the manner of attaining them, will become more apparent and the invention will be better understood by reference to the following description of embodiments of the invention taken in conjunction with the accompanying drawings, wherein:

[0077] FIG. 1 is a schematic view of an apparatus for producing a hollow glass body product with filamentary defects and open passages;

[0078] FIG. 2 shows a schematic drawing of an exemplary embodiment of a hollow glass body product provided according to the invention having introduced open passages for venting and/or pressure equalization, which may simultaneously represent an individual code;

[0079] FIG. 3 shows a schematic drawing of an exemplary embodiment of a hollow glass product provided according to the invention having introduced open passages for venting and/or pressure equalization and having filamentary defects as a predetermined breaking line;

[0080] FIG. 4 is a schematic view of an exemplary embodiment of an apparatus provided according to the invention comprising an apparatus for forming hollow glass;

[0081] FIG. 5 shows a hollow glass body product with filamentary defects arranged along an annular line;

[0082] FIG. 6 shows the hollow glass body product of FIG. 5 with a portion of the wall removed along the annular line;

[0083] FIG. 7 shows an apparatus for further processing hollow glass body products; and

[0084] FIG. 8 shows an arrangement pattern of open passages in the form of a 2D code.

[0085] Corresponding reference characters indicate corresponding parts throughout the several views. The exemplifications set out herein illustrate embodiments of the invention and such exemplifications are not to be construed as limiting the scope of the invention in any manner.

DETAILED DESCRIPTION OF THE INVENTION

[0086] FIG. 1 shows an exemplary embodiment of an apparatus 2 for producing a hollow glass body product 1, which comprises a conveying device 4 for a hollow glass body 6, a laser-based irradiation device 8 including an ultrashort pulsed laser 30 for producing focused laser radiation 10 using focusing optics 12 in order to introduce a plurality of spaced-apart filamentary defects 14 into the hollow glass body 6, at least part of which form open passages 16, and an optional directing device (not shown) for guiding the focusing optics 12.

[0087] The conveying device 4 may comprise a pulling or drawing device and may be configured to translate the hollow glass body 6 intermittingly (discontinuously) or continuously in the direction of the longitudinal axis or perpendicular thereto. At the same time, the hollow glass body 6, in particular the glass tube, may be rotated. The conveying device 4 may therefore also constitute a positioning device for selectively position the hollow glass body 6 below the laser radiation 10, or may form part of the device for directing the focused laser radiation 10 over the outer surface 28 and produce a plurality of spaced apart open passages in this way.

[0088] The apparatus 2 may also form part of a hollow glass body producing or shaping apparatus (not shown), for example for a glass tube, with the conveying device 4 feeding the hollow glass body 6 to the laser-based irradiation device 8, optionally still in the hot state.

[0089] If processing is to be performed on a moving glass, for example if the method is to be performed on a continuously produced tubular hollow glass body 6 directly when being drawn from the melt or following partial melting of a hollow glass body 6, then the laser-based irradiation device 8 and the directing device (not shown) for guiding the focusing optics 12 are configured so as to follow the movement of the hollow glass body along the conveying direction. In this way, the filamentary defects 14 and/or open passages 16 can be produced in the desired arrangement pattern during the joint movement.

[0090] In some exemplary embodiments of the apparatus 2 for producing hollow glass body products 1, the apparatus 2 may comprise an upstream thermal separation and sealing device, not shown in FIG. 1, or a thermal separation and sealing device downstream of the laser-based irradiation device 8, wherein the thermal separation and sealing device thermally separates the hollow glass body 6 into predetermined sections each having a first end portion 20 and a second end portion 22, and seals the first end portion 20 by forming a first bottom 24 and the second end portion 22 by forming a second bottom 26. When sealing during the hot forming process, a pressure difference may build up between the interior of the hollow glass body 6 and the environment, which can be equalized through the open passages 16 introduced by the laser-based irradiation device 8 until the hollow glass body product 6 is separated at a later point in time.

[0091] The laser-based irradiation device 8 can be used to introduce a plurality of spaced apart filamentary defects 14 into the hollow glass body 6 in order to form a plurality of open passages 16 connecting the interior of the hollow body 6 with the outer surface 28 thereof by at least part of the defects 14.

[0092] Laser-based irradiation device 8 comprises an ultrashort pulsed laser 30 with upstream focusing optics 12 and optionally a directing device for stably guiding the focusing optics 12 according to a desired arrangement pattern at the desired distance and at the desired irradiation angle relative to the outer surface 28 of the hollow glass body 6 in order to correctly focus and position the laser beam 10. This means that the optics 12 may be displaceable in order to move and direct the laser radiation 10 or the laser beam in a focused manner, so that the respective point of incidence of the laser beam of the ultrashort pulsed laser 30 on the outer surface 28 of the wall 27 of the hollow glass body 6 to be processed can be precisely predetermined. In this case, the directing device accordingly forms part of the device for directing the focused laser radiation 10 over the outer surface 28 in order to produce the plurality of spaced apart filamentary defects 14 in a predetermined arrangement pattern in the outer surface 28 of at least the first end portion 20 of the hollow glass body 6.

[0093] The optimum irradiation angle also depends on the thickness of the wall 27 and/or the diameter of the hollow glass body 6 and the optical properties of the material. The most favorable value for each case is determined by tests or calculations. For example, smaller angles are more advantageous for larger diameter tubes and larger angles for smaller diameter tubes.

[0094] A suitable ultrashort pulsed laser 30 for the apparatus 2 for producing a hollow glass body product 1 is a neodymium-doped yttrium-aluminum-garnet laser with a wavelength of 1064 nanometers, which may also be operated in a frequency-doubled mode. In this case, the suitable pulse duration of a laser pulse may be shorter than 10 picoseconds. Pulse frequency may be greater than 100 kHz.

[0095] In some embodiments, an appropriately programmed computer device 32 is used to control the ultrashort pulsed laser 30 and the directing device (not shown) for focusing optics 12 and optionally also to control the conveying device 4 for positioning the hollow glass body 6 below the laser beam 10. This is in particular accomplished by importing position data, such as from a file or via a network.

[0096] In this way, a plurality of spaced apart filamentary defects 14 can be produced in a predetermined arrangement pattern in the outer surface 28, and open passages 16 can be formed which provide communication between the interior of the hollow glass body 6 and the outer surface 28 thereof, wherein the diameter of each individual passage 16 is sized to be in the micrometer range, in particular to a diameter of less than 10 micrometers, and wherein a plurality of micrometer range-sized open passages 16 provide a total cross-sectional area sufficiently large for venting and/or pressure equalization.

[0097] FIG. 2 shows a view of a hollow glass body product 1 provided according to the invention having introduced open passages 16 which provide a sufficiently large cross-sectional area for venting and/or pressure equalization. More generally, without being limited to the illustrated example, in some embodiments the passages 16 are not distributed over the hollow glass body product 1, but are introduced in a grouped arrangement pattern close to each other. The passages 16 may be spaced apart by less than 1 millimeter in this case.

[0098] The hollow glass body product 1 with the outer surface 28 has a first end portion 20 and a second end portion 22, the first end portion 20 and the second end portion 22 being sealed by the first bottom 24 and the second bottom 26, respectively.

[0099] Even glass with a thickness of the wall 27 of more than 5 millimeters would be suitable for producing a passage 16 that extends through the hollow glass body 6, more generally, however, thinner glass is suitable.

[0100] Without being limited to the examples shown in the figures it is therefore suggested according to some exemplary embodiments of the invention that the hollow glass body product 1 has a thickness of the wall 27 of not more than 5 millimeters. For pharmaceutical applications, in particular for syringes or cartridges, thicknesses of the wall 27 of not more than 2.5 millimeters are usually employed.

[0101] A variety of glass compositions can be selected, as long as they are processible using a laser. For example, borosilicate glass or aluminosilicate glass are a possible option.

[0102] A plurality of spaced apart open passages 16 connecting the interior of the hollow glass body 6 with the outer surface 28 thereof are arranged along the outer surface 28, in particular in the first end portion 20 of the hollow glass body 6. A diameter of each passage 16 is sized in the micrometer range, as it can be introduced into the outer surface 28 of the hollow glass body 6 by having the ultrashort pulsed laser 30 controlled by the computer device 32 as described above, and also by controlling the directing device for the focusing optics 12 (not shown), and optionally also by controlling the conveying device 4 as a positioning device for the hollow glass body 6.

[0103] The diameter of each individual passage 16 may be greater than 0 and less than 10 micrometers, such as between more than 0 and 3 micrometers or between 1 and less than 3 micrometers.

[0104] With a plurality of micrometer range-sized open passages 16, a total cross-sectional area is obtained which is sufficiently large for venting and/or pressure equalization, and undesirable negative pressure is prevented from building up in the interior of the hollow glass body 6.

[0105] It will be apparent for a person skilled in the art how to determine the necessary number of open passages 16 defined by the filamentary defects from the cross section of the opening or diameter of an open passage 16 and the rate of pressure equalization which depends on the application. Thus, rather small open passages will be sufficient for pressure equalization during the cooling and transport of a hollow glass body over several hours.

[0106] Due to the small size of each open passage 16, the generation of particles, especially those with a critical size for penetration, can be prevented. Due to the small diameter of the open passages 16, no particles larger than the diameter of the passages 16 can reach the interior of the hollow glass body 6. Thus, the diameter of an individual open passage 16 is effective as a barrier to larger particles.

[0107] In order to ensure the mechanical strength of the hollow glass body 6, and in particular in order to prevent breakage or undesired separation of the hollow glass body 6 during handling and transport, for example of glass tubes, glass tube vials, glass ampoules, glass cartridges, or glass syringes in the pharmaceutical sector, the filamentary defects 14 and/or open passages 16 may be arranged along the circumference of the outer surface 28 of the hollow glass body 6 at minimum intervals of at least 7 micrometers or at least 10 micrometers. These distances are measured from center to center of the passages.

[0108] In the hollow glass body product 1 with pressure equalization system provided according to the invention, the open passages 16 may therefore be provided in a freely selectable geometric arrangement pattern, such as in the form of a single row array as shown in FIG. 2, and may thus simultaneously represent an individual code of the hollow glass body product 1.

[0109] Also, filamentary defects 14 may indicate errors and may thus form an error map on the wall 27 of the hollow glass body 6, for example, or may contain information about the location of errors by an arrangement of the passages 16 in the form of a code. In addition to information about process parameters, product specification, type of error and/or error position, this allows obtaining important information about the origin, originality, manufacture, specific production data of the hollow glass body 6 or the hollow glass body product 1, in particular for the purposes of tracing, further processing, identification of originality, for quality assurance and quality improvement, counterfeit protection, and/or to combat product piracy.

[0110] FIG. 3 shows a view of a hollow glass body product 1 provided according to the invention featuring introduced open passages 16 for venting and/or pressure equalization, for example in the form of a ring 18 extending around the circumference of the tubular hollow glass body product, as a predetermined breaking line 35 for separation of the hollow glass body 6 along this annular line at a later point in time.

[0111] Alternatively or cumulatively to the separation of the hollow glass body 6 into predetermined sections along the predetermined breaking line, the filamentary defects 14 and/or open passages 16 may also be arranged so as to define an opening in the wall 27 on the outer surface 28 of the hollow glass body 6, such as with a total diameter of the opening in a range of some or a few millimeters, for example as a vent opening or as a filling opening.

[0112] If the hollow glass body 6 in the form of a tube glass is arranged vertically, with an opening oriented upwards, the chimney effect of a vertically upward air flow can be exploited to dissipate air through the upper opening.

[0113] In some embodiments provided in accordance with the invention, the apparatus and method for producing hollow glass body products 1 may in particular comprise an apparatus 3 for producing tube glass. FIG. 4 schematically shows such an apparatus. The tube glass formed by the apparatus 3 from a melt 7 represents the hollow glass body 6 which is further processed into a hollow glass body product 1 according to the invention by the apparatus 2. For this purpose, the tube glass is fed to a thermal sealing device 5 which heat the tube glass annularly. Upon softening, the tube glass constricts itself and separates, simultaneously the severed ends are closing to forming the bottoms 24, 26. In the illustrated embodiment, the laser-based irradiation device 8 is arranged downstream of sealing device 5. However, it is likewise possible to introduce passages 16 prior to the separation into sections. According to some embodiments, the tubular hollow glass body product so obtained generally has an outer diameter in a range from 4 mm to 120 mm, such as in the range from 6 mm to 30 mm. Exemplary individual values of the outer diameter include: 6.85 mm, 8.15 mm, 10.75 mm, 10.85 mm, 12.75 mm, 14.45 mm, 14.75 mm, 16 mm, 17.05 mm, 17.75 mm, 22 mm, 22.05 mm, 22.5 mm, 24 mm, and 30 mm.

[0114] According to some embodiments, the length is in a range from 0.4 meters to 2.5 meters, such as in the range from 1.2 meters to 1.8 meters. A length of 1.5 meters is an exemplary dimension.

[0115] Exemplary wall thicknesses are in a range from 0.1 mm to 2.5 mm, such as in the range from 0.4 mm to 16 mm. Such hollow glass body products are particularly suitable for the further processing into hollow glass articles such as syringes, ampoules, and glass vials. Exemplary individual values of the wall thickness include: 0.5 mm, 0.55 mm, 0.6 mm, 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, 1.4 mm, and 1.5 mm.

[0116] In some exemplary embodiments of the method, the predetermined breaking line consisting of passages 16 introduced next to one another may define a closed annular line, and for producing a larger opening in the outer surface 28 of the hollow glass body 6 a portion of the wall 27 of the hollow glass body 6 is detached or removed by a temperature difference and/or pressure difference. For example, a circular filling opening can be produced by separating a portion from the surrounding hollow glass body 6 like a kind of plug by cooling the portion of the wall 27 to be detached from the surrounding wall 27.

[0117] FIG. 5 shows a hollow glass body product 1 with such an annular predetermined breaking line 35 extending along the lateral surface of the tubular hollow glass body product 1 and being defined by passages 16 arranged side by side. Here, in contrast to the embodiment shown in FIG. 3, the predetermined breaking line 35 does not divide the hollow glass body product 1 into two axial sections so that upon severing the end face or tube end would be opened. Rather, the resulting opening is located in the lateral surface.

[0118] FIG. 6 shows the tubular hollow glass body product 1 after an opening 36 has been produced in the lateral surface of a tubular hollow glass body product 1 by detaching the portion of the wall. The annular predetermined breaking line 35 does not extend circumferentially around the lateral surface so as to divide the hollow glass body product 1 into two axial sections, but is rather introduced so as to produce an opening 36 in the lateral surface. Accordingly, at least the center of the opening 36 is spaced apart from the nearest end of the tubular hollow glass body product 1.

[0119] FIG. 7 shows an apparatus for the further processing of hollow glass body products 1 as can be produced by the method described so far. Further processing typically aims to produce hollow glass articles such as glass tube vials, glass ampoules, glass cartridges, or glass syringes. These glass products are typically made from rather short sections of the hollow glass body product 1. At the beginning of further processing, the hollow glass body product 1 is opened. This opening may be achieved by a cold process, for example by score-and-break separation. However, glass splinters might get into the hollow glass body in this way. In order to avoid this, an apparatus and a method is provided according to exemplary embodiments of the invention and without being limited to the specific illustrated example, according to which the hollow glass body product 1 is separated for further processing, and prior to the separating, a pressure difference is generated between the interior of the hollow glass body product 1 and the exterior thereof such that the pressure inside is higher than the pressure in the exterior, and the pressure difference is generated by a gas exchange through the open passages 16, so that any particles produced by the separating are dissipated away from the hollow glass body 6 by the escaping overpressure.

[0120] For further processing, the tubular hollow glass body product 1 may be clamped in a chuck 38. The chuck 38 rotates the hollow glass body product 1 about the longitudinal axis thereof, while a scoring device 40 introduces a circumferential score 41 extending in the circumferential direction of the hollow glass body product 1. Separation along the score 41 for separating the end portion 22 may be achieved by a momentum exerted laterally onto the hollow glass body product, for example. In any case, glass particles may be produced by the tearing of the glass when the end portion is knocked off, which would then also get into the interior of the hollow glass body product and remain there. Such particles may then also be found in the articles made from the hollow glass body product. In order to avoid this, the apparatus 33 for further processing hollow glass body products 1 according to some embodiments comprises a differential pressure device 9 which is used to establish a pressure difference such that the pressure in the interior of the hollow body is greater than the ambient pressure in the exterior at the location of the score 41. For example, the differential pressure device 9 may comprise a housing 45 with an opening through which the hollow glass body product 1 is guided. The opening is sealed by a seal 43. In the illustrated example, the chuck 38 is also arranged in this housing. However, what is in particular arranged in the housing 45 is the portion of the hollow glass body product 1 in which the open passages 16 are located. Finally, a pump 47 is connected to the housing 45, which generates an overpressure in the housing 45. As a result, gas will also flow through the passages 16 into the interior of the hollow glass body product 1, and the pressure in the interior will equalize with the pressure in the housing 45. If the end portion 22 is then knocked off along the score 41, the pressurized gas will escape along the breaking line and will thereby blow off any particles that are being produced by the breaking.

[0121] Once the tubular hollow glass body product has been opened, hollow glass articles can then be produced from sections thereof by further processing, in particular by hot forming, for example vials, ampoules, or syringes.

[0122] As already stated, information may furthermore be integrated into the lateral arrangement pattern of the open passages 16. For example, according to one embodiment it is generally contemplated that the passages 16 are introduced such that their lateral positions form a 2D code, for example a data matrix code. FIG. 8 shows an example of this. In the illustrated example, the 2D code 19 of this arrangement pattern of passages 16 is a data matrix code. The code may contain various information, such as relating to glass type and dimensions. By way of example, the illustrated example encodes information about a date, the glass type (borosilicate glass), the outer diameter (30 mm), and the length of the tubular hollow glass body product 1 (1500 mm). The pattern 19 may also serve as an adjusting or supporting aid upon clamping into the chuck 38 of an apparatus for further processing. However, in order to be useful for adjusting purposes or as a mark, the arrangement pattern of the passages 16 does not necessarily have to be in the form of a code. Optionally, the location of the passages on the hollow glass body product 1 might already be sufficient as a reference position for this purpose.

[0123] While this invention has been described with respect to at least one embodiment, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims.

LIST OF REFERENCE NUMERALS

[0124] 1 Hollow glass body product [0125] 2 Apparatus for producing a hollow glass body product 1 [0126] 3 Apparatus for producing tube glass [0127] 4 Conveying device [0128] 5 Thermal sealing device [0129] 6 Hollow glass body [0130] 7 Melt [0131] 8 Laser-based irradiation device [0132] 9 Differential pressure device/overpressure system [0133] 10 Laser radiation [0134] 12 Focusing optics [0135] 14 Filamentary defect(s) [0136] 16 Open passage(s) [0137] 18 Ring [0138] 19 2D code [0139] 20 First end portion [0140] 22 Second end portion [0141] 24 First bottom [0142] 26 Second bottom [0143] 27 Wall [0144] 28 Outer surface [0145] 30 Ultrashort pulsed laser [0146] 32 Computer device [0147] 33 Apparatus for further processing hollow glass body products [0148] 35 Predetermined breaking line [0149] 36 Opening in 27 [0150] 38 Chuck [0151] 40 Scoring device [0152] 41 Score [0153] 43 Seal [0154] 45 Housing [0155] 47 Pump