Method for manufacturing a hollow glass article

Abstract

The invention relates to a method for producing a hollow glass article (1), in which a glass drop (2) is transferred into a mold (3, 4) and inflated therein to form the hollow glass article (1) at least by means of compressed air (5); wherein the method comprises a first process (6) with first process parameters for producing the hollow glass articles (1), wherein the first process (6) is interrupted at certain time intervals and the mold (3, 4) is supplied with a lubricant (7), wherein the method comprises at least the following steps: a) carrying out the first process (6) with first process parameters; b) interrupting the first process (6) and supplying the mold (3, 4) with a lubricant (7); c) initiating a second process (8) with second process parameters which differ at least partially from the first process parameters; d) resuming the first process (6) with first process parameters).

Description

The present invention relates to a method for producing a hollow glass article and to a system for data processing.Hollow glass articles are produced in a production plant designed as a glass forming machine starting from a glass melt. In this case, a drop of glass is separated from the glass melt and shaped in the course of a shaping process to form a hollow glass article. The shaping process takes place via at least one mold into which the glass drop is introduced and then shaped.In this case, it is also possible to use a plurality of molds, for example at least one preform and one finished mold. In the at least one preform, an intermediate product is produced from the glass drop or from an intermediate product already produced in another preform. In the finished mold, the intermediate product (the glass drop or) is formed into the hollow glass article. The hollow glass article produced in this way is then cooled, in particular the hollow glass article is transferred via a settling plate to a conveyor belt and then enters a cooling furnace.The production process is characterized in particular by a plurality of stations, the respective operating or process parameters of which must be adjustable and must be monitored with a view to a reproducible production result of constant quality. This applies to all parameters influencing the shaping process.Hollow glass articles are produced in different sizes and shapes, resulting in production series which are operated as a function of parameter settings which are based, for example, on experience values documented in operation. The set of process parameters used in this case includes in particular all parameters of the glass forming process, i.e. of the respective production process. This relates, inter alia, to the chemical composition and viscosity of the glass drop, to the temperature thereof, to the respective curve of the temperature change of the glass drop, of the intermediate product and of the hollow glass article, and to the temperatures of the individual molds and other constituents of the production plant which come into contact with the glass drop, the intermediate product or the hollow glass article. As further parameters, for example, the air volume flows are to be set which are used for inflating the glass drop, the intermediate product or the hollow glass article or for cooling or tempering the mold, in particular with regard to temperature, pressure, volume flow. Parameters for the vacuum applied to the mold during the forming of the glass drop, the intermediate product or the hollow glass article, for example the period of time during which the vacuum is generated and / or held or the pressure value set in the process, can also be set, controlled and monitored. In addition, the times for the individual process steps, for example the holding of the glass drop, intermediate product or hollow glass article in the mold or its transport between the molds or stations, can be adjusted, controlled and monitored.Especially for the production of large quantities, which are regularly produced on glass forming machines, the process parameters must be kept as constant as possible, so that hollow glass articles can be produced reproducibly.The mold or molds used for the production of the hollow glass article must regularly be acted upon with a lubricant in order to avoid adhesion of the glass material to the mold or in order to keep the process sequence as reproducible as possible. This lubrication is referred to in particular as a "swab" cycle and lubrication as a "swabbing". For lubricating the mold, the actual production process for the hollow glass article must be interrupted. However, this means that the hot glass material is no longer applied to the molds according to the sequence of the shaping process (first process with first process parameters), so that the molds cool down increasingly. After the lubrication, the shaping process is started again, wherein the first process parameters are again used in this case. The molds are successively heated until stable conditions are again established, in particular with regard to the temperatures of the mold. However, the hollow glass articles produced up to then have to be regarded as rejects because they cannot achieve the quality of the hollow glass articles which are produced at stable conditions.There is a regular need to handle the given resources as economically as possible, in particular with regard to the use of energy.It is therefore the object of the invention to at least partially solve the problems present with respect to the prior art and in particular to propose a method for producing a hollow glass article, by means of which energy can be saved and waste can be reduced. In particular, the influence of the lubrication process is to be reduced, so that fewer rejects are produced as far as possible and a more stable production process of hollow glass articles is established as early as possible.These objects are achieved by a method for producing a hollow glass article according to the features of claim 1. It should be pointed out that the features listed individually in the dependent patent claims can be combined with one another in a technically expedient manner and define further embodiments of the invention. In addition, the features specified in the patent claims are more precisely described and explained in the description, further preferred embodiments of the invention being presented.A method for producing a hollow glass article is proposed, in which a drop of glass is transferred into a mold and is therein blown into the hollow glass article at least by means of compressed air. The method has a first process with first process parameters for producing the hollow glass articles (or a plurality of hollow glass articles), wherein the first process is interrupted at specific time intervals and a lubricant is applied to the mold. The method includes at least the following steps: a) performing the first process with first process parameters (to produce a plurality of hollow glass articles of constant quality); b) interrupting the first process and applying lubricant to the mold; c) initiating a second process with second process parameters that are at least partially different from the first process parameters; d) resuming the first process with first process parameters.The above (non-final) classification of the method steps in a) to d) is primarily intended only for differentiation purposes and does not force any sequence and / or dependency. In particular, steps a) to d) are carried out in the order listed.The method is carried out in particular during the operation of a production plant designed as a glass forming machine. The hollow glass articles are produced starting from a glass melt. As stated at the beginning, a drop of glass is separated from the glass melt and formed into a hollow glass article in the course of a forming process. The shaping process takes place via at least one mold into which the glass drop is introduced and then shaped.The present method is directed in particular to production plants by means of which a plurality of 1,000 hollow glass articles, in particular more than 10,000 hollow glass articles, preferably more than 100,000 hollow glass articles, can be produced per day.In this case, it is also possible to use a plurality of molds, for example at least one preform and one finished mold. In the at least one preform, an intermediate product is produced from the glass drop or from an intermediate product already produced in another preform. In the finished mold, the intermediate product (the glass drop or) is formed into the hollow glass article. The hollow glass article produced in this way is then cooled.In step a), the first process is carried out. This includes first process parameters, by means of which a multiplicity of hollow glass articles can be produced or are produced reproducibly. Adjustments to the first parameters are not required during the first process. The scrap of (defective) hollow glass articles produced during the first process is in particular less than 1% of the hollow glass articles produced.The first process is interrupted-as usual-at certain intervals by step b) for lubricating the mold or molds. A lubricant is introduced into the respective mold. The lubricant is intended in particular to avoid adhesions of the glass material to the mold, so that good mouldability of the glass material from the mold can be realized.The lubrication, however, requires an interruption of the first process, so that the mold or molds are not charged with the glass material at least for the period of lubrication. This leads to the respective shape cooling down, so that a window defined for the first process parameters (i.e. a tolerance field for the individual first process parameters) cannot be observed.It is known to resume the forming process with first process parameters after the lubrication. The molds are successively heated until stable conditions are again established, in particular with regard to the temperatures of the mold. However, the hollow glass articles produced up to then have to be regarded as rejects because they cannot achieve the quality of the hollow glass articles which are produced at stable conditions. The scrap is thus 100%. In particular, in known processes, a relatively large number of hollow glass articles are produced as waste until a stable first process is again present. This number of hollow glass articles produced as scrap is considered as a reference value below and is 100%.In contrast to known processes, it is proposed here to carry out a step c). In the context of step c), a second process is initiated, in which second process parameters are used. The second process parameters are at least partially different from the first process parameters. In particular, at least one second process parameter lies outside a tolerance field defined for the first process parameters.The second process is particularly directed to heating the mold or molds more quickly to the temperature present during the first process, so that resumption of production of constant quality hollow glass articles can be performed more quickly. In this case, the number of hollow glass articles produced as rejects is to be reduced from the 100% (e.g. 100 hollow glass articles) present in known processes to, for example, less than 50% (that is to say less than 50 hollow glass articles).The hollow glass articles produced by the second process are considered rejects because they cannot achieve the quality of the hollow glass articles produced at stable conditions. The scrap is thus 100%.According to step d), the first process is resumed (and thus the second process is ended) if the preconditions (mold temperatures, etc.) defined for the first process are again present.In particular, during step a) the mold has a first temperature at at least one contact point with the glass drop, which lies within a first temperature range; wherein during step b) a temperature drop occurs at the contact point to a lower second temperature, which lies outside the first temperature range. The second process parameters are in particular modified with respect to the first parameters such that during step c) the temperature at the contact point is increased to the first temperature.The second process parameters are in particular changed in such a way that the temperature at the contact point is increased more quickly than would be the case if the first process parameters were used.In particular, production of the hollow glass article from the glass drop through the mold is referred to as a production cycle. When carrying out step c), in particular a first number of scrap-producing production cycles (or number of hollow glass articles produced) is reduced by at least 30%, preferably by at least 50%, particularly preferably by at least 75%, compared with a second number of scrap-producing production cycles (or number of hollow glass articles produced), with exclusive use of the first process parameters.In particular, by applying step c), a number of hollow glass articles produced as rejects can thus be reduced from the 100% (e.g. 100 hollow glass articles) present in known processes to 70% or less (i.e. 70 hollow glass articles or less), or to 50% (or less) or even 25% (or less).In particular, a second process parameter that differs from the first process parameters comprises at least one of the following parameters, which is changed with respect to the corresponding first process parameter as follows:• Lengthening of a first contact time between glass droplets or hollow glass article on the one hand and mould on the other hand;• Lengthening a second contact time between glass droplets or hollow glass article on the one hand and a punch on the other hand, said punch being used for forming an inner surface of said hollow glass article;• reducing a first cooling time of the mold, wherein the first cooling time comprises a time interval between removing the hollow glass article from the mold and introducing the drop of glass into the mold;• varying an air volume flow to reduce cooling performance for the mold;• Change of vacuum applied to the mold.In particular, the mold is a preform or a finished mold, wherein the glass drop in the preform is formed into an intermediate product and the intermediate product in the finished mold is formed into the hollow glass article. A plurality of preforms can also be provided. In this case, the gob of glass in the preform (first generation) is formed into an intermediate product (first generation) and then in a further preform (second generation) is formed into an intermediate product (second generation), etc.The mold is in particular a negative of an outer surface of the hollow glass article or of the intermediate product. In particular, the mold consists of several parts that are movable relative to each other, e.g., of mold halves and, if applicable, closure parts. The individual parts of the mold are moved apart to demold the intermediate product or the hollow glass article and moved towards one another again to form the mold before the glass drop or the intermediate product is introduced.In particular, by increasing the first contact time between glass droplets, intermediate product or hollow glass article on the one hand and mold on the other hand, more heat can be transferred from the glass material to the mold, so that the latter warms up more quickly and to a higher temperature (than when using the first process).In particular, by lengthening a second contact time between glass droplets, intermediate product or hollow glass article on the one hand and a punch on the other hand, more heat can be transferred from the glass material to the punch, so that the latter warms up more quickly and to a higher temperature (than when using the first process).The (fundamentally known) punch serves in particular for forming an inner surface of the hollow glass article. The punch is in particular designed to be movable and moves into the mold for forming the hollow glass article.In particular, by reducing a first cooling time of the mold, a temperature drop on the mold (or a punch) can be reduced (compared to an application of the first process). The first cooling time is defined as a time interval between removing the hollow glass article (or intermediate product) from the mold and introducing the drop of glass (or intermediate product) into the mold. This time interval can be shortened, for example, by increasing the clock frequency of the production process. Alternatively or additionally, a transfer time of the glass material between the individual process steps can be shortened, so that the respective shape is charged again with glass material more quickly (than in the first process).In particular, by changing an air volume flow which is used for tempering the mold, a cooling capacity for the mold can be reduced. For this purpose, the air volume flow can be changed or completely interrupted, for example with respect to the volume flow (in particular reduction), the temperature (in particular increase) or the pressure (in particular reduction).In particular, the at least one form has ducts which are acted upon by the air volume flow. The air volume flow can alternatively or additionally be applied to an inner surface of the mold itself. The air volume flow can be used to temperature control the mold, so that a stable condition for producing hollow glass articles is present within the scope of a first process. By changing the air volume flow, in particular a targeted rapid heating of the respective shape or punch or other part of the production plant can be achieved.In particular, by changing a vacuum applied to the mold, a targeted rapid heating of the respective mold or punch or other part of the production plant, for example, can be achieved. The vacuum is used in particular when blowing the glass drop or the intermediate product into the hollow glass article or the intermediate product. Air can thus be removed more quickly from the intermediate space between the inner surface of the mold and the glass material, so that the shaping process of the glass material can be supported.However, heat is also extracted from the mold by the vacuum, so that a targeted rapid heating of, for example, the respective mold or punch or other part of the production plant can be achieved by changing or even switching off the vacuum.Of course, other parameters can also be changed, so that a more rapid heating of the mold or of the components of the production plant is realized.In particular, the hollow glass articles produced during step c) are treated as scrap.A system for data processing is also proposed, which comprises means which are suitably equipped, configured or programmed for carrying out the method at a production plant for producing hollow glass articlesIn particular, a production plant suitably designed for carrying out the respective method comprises a system for data processing, e.g. a control device, which has means for carrying out the steps of the method and / or which has means which are suitably equipped, configured or programmed for carrying out the steps of the method or which carry out the method.The means comprise, for example, a processor and a memory in which instructions to be executed by the processor are stored, and data lines or transmission devices which enable commands, measured values, data or the like to be transmitted between the elements mentioned.The "means" can comprise in particular one or more of the following components: controller(s), microcontrollers, data memories, data connections, display devices (such as a display), counters or timer (timer), at least one further sensor, an energy source, etc.A computer program is also proposed, comprising instructions which, when the computer program is executed by a computer, cause the computer program to execute the described method or the steps of the described method.A computer-readable storage medium is also proposed, comprising instructions which, when executed by a computer, cause the computer to execute the described method or the steps of the described method.The embodiments of the methods can be transferred in particular equally to the system for data processing and / or the computer-implemented method (i.e. the computer program and the computer-readable storage medium) and vice versa.The use of indefinite articles ("a", "an", and "an"), in particular in the claims and the description reflecting them, is to be understood as such and not as a numerical word. Terms or components introduced therewith are thus to be understood such that they are present at least once and in particular can also be present multiple times.As a precautionary measure, it should be noted that the numerical words used here ("first", "second", "third",... ) serve primarily (only) for distinguishing a plurality of articles, sizes or processes of the same type, that is to say in particular do not necessarily specify a dependence and / or sequence of these articles, sizes or processes on one another. If a dependence and / or sequence is required, this is explicitly stated here or it is obvious to the person skilled in the art when studying the specifically described configuration.The invention and the technical field are explained in more detail below with reference to the figures. It should be noted that the invention is not intended to be limited by the exemplary embodiments shown. In particular, unless explicitly stated otherwise, it is also possible to extract partial aspects of the facts explained in the figures and combine them with other components and findings from the present description and / or figures. Identical reference numerals designate identical objects, so that explanations from other figures can be used additionally if appropriate. They show schematically: FIG. 1 : shows a hollow glass article in a perspective view; FIG. 2 : a flow diagram of a method; FIG. 3 : shows a preform during step a) of the method; FIG. 4 shows a finished mold during step a) of the method; and FIG. 5 is a diagram.FIG. 1 shows a hollow glass article 1 in a perspective view. FIG. 2 shows a flow diagram of a method. Figure 3 shows a preform 3 during step a) of the process. FIG. 4 shows a finished mold 4 during step a) of the method. FIGS. 1, 2, 3 to 4 are described together below.In the context of the proposed method, a glass drop 2 is transferred into a mold 3, 4 and is therein inflated to the hollow glass article 1 at least by means of compressed air 5.The method is carried out during the operation of a production plant 18 designed as a glass forming machine. The production plant 18 comprises a system 17 for data processing, which has means which are suitably equipped, configured or programmed for carrying out the method on the production plant 18, in particular for fully automatic execution.The hollow glass articles 1 are produced starting from a glass melt. In this case, a glass drop 2 is separated from the glass melt and shaped in the course of a shaping process to form a hollow glass article 1. The shaping process takes place via a preform 3 (see FIG. 3 ) and a finished mold 4 (see FIG. 4 ), wherein the glass drop 2 is introduced into the preform 3 and is formed therein into an intermediate product 16. The intermediate product 16 is then transferred into a finished mould 4 and there formed into the (finished) hollow glass article 1. The hollow glass article 1 produced in this way is then cooled.In the context of step a), the first process 6 is carried out. This comprises first process parameters, by means of which a multiplicity of hollow glass articles 1 can be produced or are produced reproducibly. Adjustments to the first parameters are not required during the first process 6. The waste of (defective) hollow glass articles 1 produced during the first process is as low as possible.The first process 6 is interrupted-as usual-at certain time intervals by step b) for lubricating the moulds 3, 4. The lubricant 7 is intended to avoid adhesions of the glass material to the mould 3, 4, so that good mouldability of the glass material from the mould 3, 4 can be achieved.In contrast to known processes, step c) is carried out. Within the scope of step c), a second process 8 is initiated, in which second process parameters are used. The second process parameters are at least partially different from the first process parameters.The second process 8 is directed to heating the moulds 3, 4 more quickly to the first temperature 10 present during the first process 6, so that a resumption of the production of hollow glass articles 1 of constant quality can take place more quickly. The number of hollow glass articles 1 produced as rejects is to be reduced.The hollow glass articles 1 produced by the second process 8 are considered as rejects because they cannot achieve the quality of the hollow glass articles 1 produced at stable conditions. The scrap is thus 100%.According to step d), the first process 6 is resumed (and thus the second process 8 is ended) if the preconditions (mold temperatures, etc.) defined for the first process 6 are again present.The moulds 3, 4 comprise a preform 3 and a finishing mould 4. the finishing mould 4 is a negative of an outer surface of the hollow glass article 1, the preform 3 is a negative of an outer surface of the intermediate product 16. In the preform 3, a punch 15 is inserted into the preform 3 via the lower opening of the preform 3. The glass drop 2 forms a hollow body by the punch 15, which is then formed into the hollow glass article 1 in the finished mold 4. The individual parts of the mold 3, 4 are moved apart to demold the intermediate product 16 or the hollow glass article 1 and moved towards one another again to form the mold 3, 4 before the glass drop 2 or the intermediate product 16 is introduced.During step a), i.e. during the first process 6, the molds 3, 4 have a first temperature 10 at at least one contact point 9 with the glass drop 2 or with the intermediate product 16, which lies within a first temperature range; during step b), a temperature drop occurs at the contact point 9 to a lower second temperature 11 which lies outside the first temperature range (see also FIG. 5 ). The second process parameters are changed with respect to the first process parameters such that during step c) the temperature at the contact point 9 is returned to the first temperature 10, i.e. increased.The second process parameters are changed in such a way that the temperature at the contact point 9 is increased more quickly than would be the case if the first process parameters were used.FIG. 5 shows a diagram. The number 13, 14 of production cycles 12 is plotted on the horizontal axis. The temperature 10, 11 is plotted on the vertical axis. Reference is made to the explanations relating to FIGS. 1, 2, 3 to 4.Production of the hollow glass article 1 from the glass drop 2 by the molds 3, 4 is referred to as a production cycle 12.The first process 6 is interrupted-as usual-at certain time intervals by step b) for lubricating the moulds 3, 4. During step b), a temperature drop occurs at the contact point 9, starting from the first temperature 10 to a lower second temperature 11, so that a window defined for the first process parameters (i.e. a tolerance field for the individual first process parameters) cannot be observed. The curves 19, 20, 21 of the temperature 10, 11 at this contact point 9 shown in FIG. 5 illustrate the effect of step c) of the method.It is known to resume the shaping process again with first process parameters, i.e. the first process 6, after the lubrication. In this case, the molds 3, 4 are successively heated until stable conditions are again established, precisely with regard to the temperatures 10, 11 of the molds 3, 4. However, the hollow glass articles 1 produced up to then have to be regarded as rejects because they cannot achieve the quality of the hollow glass articles 1 which are produced at stable conditions. The scrap is thus 100%. In known processes, a relatively large number of hollow glass articles 1 are produced as scrap until a stable first process 6 is again present. This number of hollow glass articles 1 produced as rejects is considered below as a reference value and amounts to 100% or, in the case of the first profile 19 shown, a second number 14 of 17 production cyclesThe second process 8 is directed to heating the moulds 3, 4 more quickly to the first temperature 10 present during the first process 6, so that a resumption of the production of hollow glass articles 1 of constant quality can take place more quickly. The number of hollow glass articles 1 produced as rejects is to be reduced.The first curve 19 shows the change in the temperature 10, 11 in known methods, wherein starting from the first process 6 when carrying out step b) of the method, a drop in the temperature takes place from the first temperature 10 to the second temperature 11 and then the temperature rises again successively. After the lubrication, the first process 6 is then carried out. It can be seen that a second number 14 of 17 production cycles (17 hollow glass articles 1) produced are required until the first temperature 10 is once again established at the contact point 9 of the mould 3, 4.The second curve 20 shows the change in the temperature 10, 11 when carrying out step c) of the method, wherein, starting from the first process 6 when carrying out step b) of the method, the temperature falls from the first temperature 10 to the second temperature 11 and then the temperature rises successively but more rapidly than in the first curve 19 again. In this case, the second process 8 is carried out after the lubrication. In the context of the second process, cooling of the mold 3, 4 by compressed air 5 is dispensed with. It can be seen that only a first number 13 of 9 production cycles (9 hollow glass articles 1) produced are required until the first temperature 10 is once again established at the contact point 9 of the mold 3, 4.The third curve 21 shows the change in the temperature 10, 11 when carrying out step c) of the method, wherein, starting from the first process 6 when carrying out step b) of the method, the temperature falls from the first temperature 10 to the second temperature 11 and then the temperature rises successively but more rapidly than in the first curve 19 and in the second curve 20 again. In this case, the second process 8 is carried out after the lubrication. In the context of the second process, cooling of the mold 3, 4 by compressed air 5 is dispensed with and a time period in which the intermediate product 16 or the hollow glass article 1 contacts the respective mold 3, 4 is extended. It can be seen that only a first number 13 of 6 production cycles (6 hollow glass articles produced) are required until the first temperature 10 is once again established at the contact point 9 of the mold 3, 4.It can thus be seen that by lengthening the first contact time between glass droplets 2, intermediate product 16 or hollow glass article 1 on the one hand and mold 3, 4 on the other hand, more heat can be transferred from the glass material to the mold 3, 4, so that the latter warms up more quickly and to a higher temperature (than when using the first process 6).At the same time, by lengthening a second contact time between glass droplets 2 or intermediate product 15 on the one hand and a punch 15 on the other hand, more heat can be transferred from the glass material to the punch 15, so that the latter warms up more quickly and to a higher temperature (than when using the first process 6).It can also be seen that by changing an air volume flow which is used for tempering the mold 3, 4, a cooling capacity for the mold 3, 4 can be reduced. For this purpose, the air volume flow can be changed or completely interrupted, for example with respect to the volume flow (in particular reduction), the temperature (in particular increase) or the pressure (in particular reduction). It can be seen in FIG. 4 that the compressed air 5 is used on the one hand for inflating the glass material and on the other hand for tempering the finished mould 4 (by the controlled impingement of the channels 22.The hollow glass articles 1 produced during step c) are treated as scrap.In particular, by applying step c), a second number 14 of hollow glass articles 1 produced as rejects can be reduced from the 100% present in known processes (in this case therefore 17 hollow glass articles 1) to approximately 53% (second profile 20) or approximately 35% (third profile 21).List of reference characters1 Hollow glass article 2 Glass drop 3 Preform (mold) 4 Finished mold (mold) 5 Compressed air 6 First process 7 Lubricant 8 Second process 9 Contact point 10 First temperature 11 Second temperature 12 Production cycle 13 First number 14 Second number 15 Punch 16 Intermediate product 17 System 18 Production plant 19 First course 20 Second course 21 Third course 22 Channel

Claims

Method for producing a hollow glass article (1), in which a drop of glass (2) is transferred into a mold (3, 4) and is therein inflated to form the hollow glass article (1) at least by means of compressed air (5); wherein the method has a first process (6) with first process parameters for producing a multiplicity of hollow glass articles (1), wherein the first process (6) is interrupted at specific time intervals and a lubricant (7) is applied to the mold (3, 4), wherein the method comprises at least the following steps: a) carrying out the first process (6) with first process parameters; b) interrupting the first process (6) and applying a lubricant (7) to the mold (3, 4); c) initiating a second process (8) with second process parameters which differ at least partially from the first process parameters; d) Resuming the first process (6) with first process parameters.Method according to claim 1, wherein during step a) the mould (3, 4) has a first temperature (10) at at least one contact point (9) with the glass drop (2) which lies within a first temperature range; wherein during step b) a temperature drop occurs at the contact point (9) to a lower second temperature (11) which lies outside the first temperature range; wherein the second process parameters are changed with respect to the first process parameters such that during step c) the temperature at the contact point (9) is increased to the first temperature (10).Method according to claim 2, wherein a production of the hollow glass article (1) from the glass drop (2) by the mold (3, 4) is referred to as a production cycle (12), wherein by carrying out step c) a first number (13) of scrap-producing production cycles (12) is reduced by at least 30% compared to a second number (14) of scrap-producing production cycles (12) with exclusive application of the first process parameters.Method according to one of the preceding patent claims, wherein a second process parameter different from the first process parameters comprises at least one of the following parameters, which is changed with respect to the corresponding first process parameter as follows: • lengthening a first contact time between glass droplets (2) or hollow glass article (1) on the one hand and mold (3, 4) on the other hand; • lengthening a second contact time between glass droplets (2) or hollow glass article (1) on the one hand and a punch (15) on the other hand, wherein the punch (15) is used for forming an inner surface of the hollow glass article (1); • reducing a first cooling time of the mold (3, 4), wherein the first cooling time comprises a time interval between removal of the hollow glass article (1) from the mold (3, 4) and introduction of the glass droplet (2) into the mold (3, 4); • Change of an air volume flow for reducing a cooling capacity for the mold (3, 4); • Change of a vacuum applied to the mold (3, 4).Method according to one of the preceding patent claims, wherein the mold (3, 4) is a preform (3) or a finished mold (4), wherein the glass drop (2) in the preform (3) is formed into an intermediate product (16) and the intermediate product (16) in the finished mold (4) is formed into the hollow glass article (1).Method according to one of the preceding patent claims, wherein the hollow glass articles (1) produced during step c) are treated as scrap.A data processing system (17) comprising means suitably equipped, configured or programmed for carrying out the method at a production plant (18) for producing hollow glass articles (1).

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