PREFORM BASE PRESSING SYSTEM FOR FORMING A BURR-FREE MOUTH ENTRY OF A GLASS CONTAINER TO BE MANUFACTURED AND A METHOD FOR PRODUCING A PAN USING THE SAME

Description

[0001] The present invention relates to a preform bottom pressing system for forming a burr-free mouth inlet of a glass container to be manufactured and to a method for producing a parison by means of the same.

[0002] In preform base pressing systems, particularly in the narrow neck pressing process for the cylindrical design of the inner mouth, burrs often form at the mouth entrance during state-of-the-art production.

[0003] For example, EP 0 327 240 A1 shows a device (see there for example Fig. 1 ) for a blow molding process for so-called IS ( Individual Section ) Glass forming machines. The final working position of the press ram is determined by the deformation resistance of the molten glass in the preform when the preform cavity is completely filled with glass. It therefore depends on the mass of the glass gob and / or the volume of the preform cavity. Due to fluctuations in the weight of the glass gob, the final working position reaches different end positions.

[0004] The design of the press ram is slightly conical to almost cylindrical where it guides the neck finish. Towards the end of the pressing process, when the press ram has almost reached its final working position, it is radially guided and centered by a non-split guide ring. Due to the guide play or gap between the guide ring and press ram and the slight conicity of the press ram in this area, glass mass can get into the gap in certain operating situations, with the size of the gap depending on the respective final working position of the press ram. This can unfortunately lead to sharp-edged forming seams, a so-called burr formation, which impairs the sealing effect and assembly conditions between the glass container closure and the glass container. It can also damage sealing and thus pre-stressed closures or inserts within the neck finish and cause large vertical indentation forces.

[0005] In another device known from the prior art according to EP 1 129 039 B1, which seeks to avoid the aforementioned disadvantage according to the teaching of EP 0 327 240 A1, the neck mold consists of a longitudinally split neck tool and a non-longitudinally split guide ring held in a radial groove of the neck tool, which is intended to axially guide the press ram. The glass contact profile of the outer sealing edge of the neck is integrated into the press ram and therefore contains no mold division between the press ram and the guide ring. The end working position of the press ram is defined by the fact that an upper annular surface of the press ram comes into contact with an annular counter-surface of the neck tool.

[0006] In this way, the disadvantage of EP 0 327 240 A1 with its final position of the press ram depending on the mass of the glass gob and the resulting problematic burr formation in the inner mouth area of ​​the parison (and later glass container) is avoided, but this is at the cost of a lack of mass compensation there to compensate for the mass fluctuations of the glass gob, which in turn can lead to quality problems with regard to the formation of the preform bottom seam, for example if the glass mass, as a result of an excessively large, massive glass gob, squeezes too much into the gap between the parison and the preform wall in the area of ​​the parison bottom, i.e. the later glass container bottom, and then forms an overly pronounced seam there, which can no longer be formed into a glass container bottom of sufficient quality during the final forming process.This can be done according to the teaching of EP 1 129 039 B1, since there the pressure with which the piston, which drives the pressing element into the glass mass to pre-form the base, can only be applied or not applied, but cannot be adjusted with regard to its magnitude (cf. valves in . Fig. 7 and 8 (including explanations) and the pressing element always moves against the glass gob in the preform with this specified pressure. If this pressure is too high due to the mass of the glass gob being too large, the incompressibility of the liquid glass can lead to the aforementioned excessive penetration of the glass into the gap between the parison and the preform wall in the area of ​​the parison base, since the glass mass can no longer escape downwards against the tightly fitting plunger, and is not intended to do so.

[0007] DE 32 32 288 C1 attempts to utilize a fixed additional volume at the beginning of the molding process to compensate for mass fluctuations and also uses compressed air control to reduce the thermal load on the piston. However, the piston stroke itself, like the aforementioned additional volume, is fixed and influenced only by the operating cycle.

[0008] To reduce the thermal load - in this case of the piston - EP 0 197 427 A1 uses cooling air guided through channels, but mass compensation is not provided here.

[0009] DE 20 10 443 A1 attempts to achieve mass balancing using a purely mechanical device in the form of a spring-loaded preform base on the side opposite the press ram. However, the press ram itself operates within a fixed, predetermined clearance, namely always up to a certain height. Furthermore, the spring-loaded preform base is only capable of achieving mass balancing to a very limited extent, namely a fixed maximum set by a pin.

[0010] EP 1 129 039 B1 attempts to address this problem by measuring the lowest piston position of the pressing element ultimately reached by means of a potentiometer in order to then use this to adjust the mass of the glass gob via the stroke of the plunger on the feeder (cf. EP 1 129 039 B1, paragraph

[0038] ).

[0011] Such an approach can, of course, at best compensate for the mass of the next batch of glass, but not for the batch currently being used for production, which has already suffered the resulting quality defect at the bottom of the gob or subsequent glass container.

[0012] Another disadvantage of EP 1 129 039 B1 is that heating and volume expansion occur at the pressing element - for example, due to the comparatively long contact of the pressing element with the warm glass mass (cf. in particular claim 2 therein). As a result of thermal linear expansion, uncontrolled play arises between the pressing element and the preform, which also promotes the formation of burrs on the preform base. Furthermore, because the guide diameter on the pressing element can become larger than its guide diameter in the preform due to thermal expansion, this can lead to tilting or jamming of the pressing element and preform, thus leading to significant process disruptions, which is unacceptable.

[0013] Against the background of the aforementioned prior art, it is therefore the object of the present invention, based on EP 1 129 039 B1, to avoid the formation of burrs between the press die and the guide ring within the mouth inlet, but at the same time to ensure the quality of the glass containers to be produced by avoiding excessive burr formation on the preform bottom seam and to avoid tilting or jamming of the press element and preform during production.

[0014] This object is achieved according to the invention by a preform base pressing system according to claim 1 and a method for producing a parison by means of such an inventive preform base pressing system according to claim 11. Expedient embodiments are disclosed in claims 2 to 9 and 11 to 14.

[0015] The preform bottom pressing system according to the invention for forming a burr-free mouth opening for a glass container to be manufactured comprises - similar to the prior art according to EP 1 129 039 B1 - a piston operated by the application of gas pressure, preferably compressed air, and a pressing element with a pressing element profile, wherein the piston, when subjected to gas pressure on one side, brings the preform bottom pressing system into the pressing position relative to a glass gob to be formed located in a preform and, in the process, preforms a bottom for the glass container to be manufactured when the pressing element profile comes into contact with the glass gob. However, the present invention differs from the prior art according to EP 1 129 039 B1 in that it provides for a control or regulation of the piston stroke, which serves to compensate for fluctuations in the mass of the glass gob by adapting this stroke to the respective glass gob mass.

[0016] Such an adjustment of the piston stroke can preferably be carried out using a gas pressure sensor, which measures the gas pressure currently applied to the piston. If a more massive gob falls into the preform, the volume of the glass mass there is also larger and the piston reaches the gob sooner, whereupon the gas pressure of the piston increases rapidly as a result of the essentially incompressible liquid glass mass immediately after the pressing element comes into contact with the glass mass. By measuring this pressure, preferably using a gas pressure sensor, the required stroke until the glass gob is reached can ultimately be determined and a further piston stroke can then be stopped or slowed down in time before the glass mass penetrates too deeply into the gap between the parison and the preform wall in the area of ​​the parison bottom.For example, mass fluctuations of the glass gob can be compensated for via the piston stroke for the currently produced parison.

[0017] However, this is by no means the only way to compensate for mass fluctuations of the glass gob via the piston stroke. For example, it is also possible to measure the height to which the glass gob introduced into the preform fills the preform. This can be done using a non-contact sensor, such as an optical sensor (e.g. a laser sensor) using triangulation measurement or a time-of-flight measurement, or even a 3D stereo recording sensor. In this way, the measurement of the fill level of the preform with glass mass then determines the distance that the piston of the preform base pressing system must travel to bring the pressing element into contact with the glass mass to preform the base.A position measuring system can then be provided on the piston, which allows the pressing element to be moved via the piston stroke according to the actual filling level of the preform with glass mass and thus adapted to the current glass mass and thus to compensate for mass fluctuations of the glass gob via the piston stroke.

[0018] Furthermore, systems can also be provided that determine the actual mass of the glass gob falling into the preform, for example by recording its spatial dimension (and specific gravity) using an image capture system, and from this determine the necessary piston stroke. Ultimately, this provides a multitude of technical possibilities that allow for the compensation of mass fluctuations of the glass gob via the piston stroke.

[0019] The preform base pressing system for forming a burr-free mouth opening for a glass container to be manufactured according to the present invention also has an internal cooling device for cooling by means of a cooling medium, whereby the possible disadvantage of heating and volume expansion at the pressing element due to prolonged contact with the warm glass mass (see above), which is possible according to the prior art according to EP 1 129 039 B1, is also avoided, and thus tilting or jamming of the pressing element and preform, and thus significant process disruptions, can no longer occur. Accordingly, the method for producing a parison is also designed such that cooling is carried out during production of the parison by means of the internal cooling device of the preform base pressing system according to the invention with a cooling medium, preferably compressed air.

[0020] Preferably, the cooling medium is distributed specifically onto the inner surfaces of the pressing element by means of suitable means for this purpose, such as a cooling medium supply line in the piston for solid blowing air (compressed air) of a glass machine and / or a cooling tube arranged in the piston.

[0021] Particularly preferably, the cooling medium is separated from the working chamber of the piston by a seal - such as a sealing package - installed on the cooling medium supply line.

[0022] If one now operates a process for producing a parison by means of this preform base pressing system according to the invention, a) a glass gob is introduced into a preform from above, for example from a feeder, and b) a punch tool is positioned in a loading position as a fall limiter for loading the glass gob at the lower end of the preform, and c) the preform bottom pressing system executes a vertical closing movement by being moved into the preform from above until a stop on the preform bottom pressing system reaches a stop surface on the preform, wherein the piston is initially not subjected to gas pressure, but is then subjected to gas pressure shortly before or upon reaching the stop surface and is thus pressed down to the stop surface, whereby the pressing element is in the pressing position, and wherein compensation for mass fluctuations of the glass gob is achieved by controlling or regulating the piston stroke by adapting this stroke to the respective glass gob mass,and d) during the vertical closing movement of the preform base pressing system, the stamping tool is pressed upwards against the parison produced in the preform and further against the pressing element in the pressing position until the stamping tool rests with its stamping surface against a cover ring surface, against which it is pressed until the pressing process is completed, and wherein the preform base pressing system is cooled with a cooling medium, preferably compressed air, during the production of the parison by means of an internal cooling device of the preform base pressing system, not only can the mass balance enable a considerable reduction in burr formation on the base of the preform and thus guarantee the quality of the glass container to be produced subsequently after the parison forming with regard to the burr formation of the preform base seam, but also can the pressing of the punch tool with its punch surface against the cover ring surface during the vertical closing movement of the preform base pressing system simultaneously ensure that burr formation between the press punch and guide ring within the mouth entrance is avoided. Likewise, the internal cooling with a cooling medium counteracts tilting or jamming of the pressing element and preform.

[0023] It is understood that according to the method according to the invention, after completion of the pressing process, demoulding takes place, wherein the stamping tool is extended vertically downwards and the preform base pressing system is extended vertically upwards and the preform is opened, whereupon a transfer to a final forming station for forming the glass container from the preformed parison can take place.

[0024] The pressing element profile of the pressing element of the preform base pressing system according to the invention preferably has a convex geometry curved towards the glass gob, which advantageously reduces the pressing pressure in the parison applied by the pressing element.

[0025] The pressing element can also be attached to the piston, preferably by means of a detachable connection, which allows for easy replacement. A threaded connection is preferably used as the detachable connection. However, other detachable connections, such as bayonet locks, are also possible.

[0026] In a further preferred embodiment of the preform base pressing system according to the invention, this system has springs - preferably integrated into the preform base pressing system according to the invention - which press the pressing element upwards against a - preferably integrated - stop surface and thus hold it in the loading position as long as the piston is not subjected to gas pressure.Such an embodiment according to the present invention is also advantageous because the springs support the already mentioned mass balance of the glass gob via the piston stroke, since they are able to dampen the pressure of the pressing element on the glass mass and ensure that the pressing element does not come into contact with the glass twice, which would negatively influence the quality of the parison formation and thus somewhat more reaction time is available for a control or regulation of the piston stroke used to adapt to the mass of the glass gob, which facilitates the control and / or regulation of the process.

[0027] In a further particularly preferred embodiment of the preform bottom pressing system according to the present invention, this system has a sliding bearing and / or a funnel guide mounted at the top of the preform, which guides the piston with pressing element axially to the preform profile before the pressing element dips into the preform profile, which can effectively counteract any jamming of the pressing element edge with the preform profile.

[0028] The prior art and non-limiting embodiments of the present invention are discussed below with reference to the drawings, which show: Fig. 1 in a schematic representation of individual production steps arranged step by step in rows from top to bottom and from left to right, an overview of the method according to the invention, Fig. 2 loading the preform with a glass gob as part of the method according to the invention, Fig. 3how the stamping tool according to the present invention serves as a fall limiter for charging the glass gob, Fig. 4 the beginning of a vertical closing movement of the preform base pressing system according to the present invention, Fig. 5 shows the further closing movement of the preform base pressing system and the pressing process of the punch tool against the parison formed in the preform upwards according to the present invention, Fig. 6a shows a preferred embodiment according to the present invention with a preferably provided integrated internal cooling of the pressing element of the preform base pressing system and its operation according to the method according to the invention, Fig. 6b shows the result of a flow analysis which shows the forced convection on the pressing element in the embodiment according to the present invention with integrated internal cooling of the pressing element according to Fig. 6a confirmed, Fig. 6cshows an embodiment according to the present invention in which ventilation slots are attached to the pressing element of the preform base pressing system, Fig. 7 illustrates once again the effects of the present invention, particularly with regard to avoiding the formation of burrs between the press ram and the guide ring within the mouth inlet, but also ensuring the quality of the glass containers to be produced with regard to the burr formation of the preform bottom seam, Fig. 8 shows the demoulding after completion of the pressing process, Fig. 9 finally, a transfer of the parison formed according to the invention to a finishing station, and Fig. 10a, Fig. 10b the problem of sharp-edged forming seams on the parison, and Fig. 10c a changed position of the ridge in the area of ​​the mouth entrance.

[0029] Fig. 1 provides an overview of the method according to the invention for producing a parison by means of a preform base pressing system in a schematic representation of individual production steps arranged step by step in rows from top to bottom and from left to right 9 according to the present invention.

[0030] Here a a glass drop from a feeder 1 from above into a preform 2 introduced, and b a stamping tool 4 in a loading position 8 as a fall limiter to charge the glass drop 1 at the lower end of the preform 2 positioned. c The preform base pressing system 9 performs a vertical closing movement by pressing into the preform from above 2 is retracted until a stop 14 on the preform base pressing system 9 a stop surface 15 on the preform2 is reached, whereby the piston 9.1 is not initially pressurized with gas, but then shortly before reaching the stop surface 15 is pressurized with gas and thus downwards to the stop surface 15 is pressed, whereby the pressing element 10 in the pressing position, whereby a compensation of mass fluctuations of the glass gob 1 by controlling or regulating the piston stroke of the piston 9.1 is done by adjusting this stroke to the respective glass gob mass. d During the vertical closing movement of the preform bottom pressing system 9 the stamp tool 4 against the preform 2 resulting parisons 1.1 upwards and further against the pressing element in the pressing position 10 pressed until the stamping tool 4 with its stamp surface 4.1 on a cover ring surface 6.1against which it remains pressed until the pressing process is completed. e After the pressing process is completed, demoulding takes place, whereby the stamping tool 4 vertically downwards and the preform bottom pressing system 9 vertically upwards and the preform 2 is opened, whereupon a transfer to a final forming station for forming a glass container from the parison can take place, whereby in the illustration shown here in the last row on the far left the transfer to the final forming station can be seen by means of the arch shown there, which indicates the pivoting of the parison.

[0031] During the production of the parison 1.1 is thereby cooled by means of an internal cooling device (see in particular Fig. 6a , 6b , 6c ) of the preform base pressing system 9cooled with a cooling medium, preferably compressed air. In this way, jamming or tilting between the pressing element 10 and preform profile 11 counteracted (see also the comments on Fig. 6a , 6b , 6c as well as the characters themselves), which has a very positive effect on process stability.

[0032] Fig. 2 shows the loading of the preform 2 with a glass drop 1 as part of the process according to the invention. Here it is shown how a glass drop is produced from a distributor (feeder) 1 from above into a preform 2, which has a longitudinally divided mold division. The glass drop 1 is thereby suspended during the vertical free fall at a point in the upper part of the preform 2 attached funnel opening 3 axial 2.1 In the lower part of the illustration there is a stamp tool4 with integrated cooling pipe 7, an estuary shape 5 and a cover ring 6 which radially and axially 2.1 in the mouth shape 5 is conducted.

[0033] Fig. 3 shows how the stamp tool 4 according to the present invention as a fall limiter for charging the glass drop 1 The stamping tool 4 is in the so-called loading position 8 positioned and serves as a fall limiter for charging the glass drop 1.

[0034] Fig. 4 shows the beginning of a vertical closing movement of the preform base press system 9 according to the present invention. As soon as the glass drop 1 into the preform 2 is introduced, the preform base pressing system closes 9 by means of vertical movement from top to bottom the preform 2 at its upper end.

[0035] Fig. 5 shows the further closing movement of the preform bottom pressing system 9 and the pressing process of the stamping tool taking place during this time 4 against the parison formed in the preform 1.1 upwards according to the present invention.

[0036] During the vertical closing movement, the preform bottom pressing system 9 from the preform 2 axially, by means of a diameter guide 9.4 aligned and guided. The piston is 9.1 not with compressed air 18 and is acted upon by means of springs 9.2 vertically upwards against an integrated stop surface 9.3 pressed. A pressing element 10, which serves to preform the base, is now in the loading position. With further vertical closing movement of the preform base press system 9 the pressing element 10 first on an upper funnel guide 10.1axially aligned. This occurs before the lower guide diameter penetrates 10.2 on the pressing element 10 into the preform profile 11. This and a plain bearing 12, which in the preform bottom press system 9 is arranged, it is ensured that the pressing element 10 before penetrating the preform profile 11 to the preform 2 axially aligned, which has a very beneficial effect on the process stability, as this prevents the edge of the pressing element from tilting 13 with the preform profile 11 The vertical closing movement of the preform base press system 9 is over as soon as the attack 14 on the preform base press system 9 the stop surface 15 on the preform 2 Preferably just before reaching the stop surface 15 the piston 9.1 using compressed air 18 against the springs9.2 down to the stop surface 9.6 pressed. The pressing element 10 is now in pressing position.

[0037] During the vertical closing movement of the preform bottom press system 9 the stamp tool 4 contrary to the previous form 2 resulting parisons 1.1 upwards against the pressing element 10, which is in the pressing position (see above). The movements and cooling options of the stamping tool 4 and its integrated cooling tube 7 are preferably carried out in a known manner by the corresponding IS machine elements and mechanisms.

[0038] The movement of the stamping tool 4 ends as soon as its stamp surface 4.1 on the cover ring surface 6.1 The stamping tool 4 is attached to the cover ring until the pressing process is completed 6 pressed.

[0039] Fig. 6a shows the integrated internal cooling of the pressing element provided according to the present invention 10 of the preform base pressing system according to the invention 9 and their operation according to the method according to the invention.

[0040] In the embodiment shown here, the preform base pressing system according to the invention has 9 via an integrated internal cooling of the pressing element 10. A compressed air source, which is common in IS glass machines, is used for the so-called blowing process. This compressed air is fed into the blowing chamber via a cooling medium supply line serving as its inlet. 16 and for cooling the pressing element 10 used. About the piston 9.1 This compressed air, which serves as a cooling medium, is driven by a piston 9.1 integrated cooling pipe 9.5 on the inner surfaces 17.1 of the pressing element 10 Due to the forced convection in the area17.2 between cooling medium (such as compressed air - see above - as cooling air or fluid) and internal surfaces 17.1 of the pressing element 10 This is cooled and thus its solid state temperature is stabilized. Preferably, the cooling medium is supplied by a 16 inserted sealing package 24 from the workspace 22 of the piston 9.1 separated.

[0041] Fig. 6b shows the result of a flow analysis which shows the forced convection on the pressing element in the embodiment according to the present invention with integrated internal cooling of the pressing element according to Fig. 6a The flow pattern is shown. Via a preform base press system 9 integrated ventilation system (see also Fig. 6a ) 17.3 escapes via the cooling medium supply line 16supplied heated cooling medium, preferably cooling air. This allows the thermal expansion of the pressing element guides (see Fig.5 ) 10.1, 10.2 which counteracts the disadvantage of heating and volume expansion at the pressing element as a result of a possibly desirable comparatively long contact with the warm glass mass in certain embodiments (cf. the prior art according to EP 1 129 039 B1, claim 2 therein).

[0042] This can prevent jamming between the pressing element 10 and preform profile 11 can be avoided, which has a very positive effect on process stability.

[0043] Cooling also leads to a reduction in play (see also Fig. 7 ) 11.1 between pressing element 10 and preform profile 11. which leads to the formation of an undesirably strong preform bottom seam 19 also counteracts.

[0044] Fig. 6c shows an embodiment according to the present invention in which ventilation slots are provided on the pressing element of the preform base pressing system 23 are provided to ensure venting of the medium, preferably air, which must escape due to displacement during the pressing process. Preferably, venting slots are also provided on the guide part.

[0045] Fig. 7 illustrates once again the effects of the present invention, particularly with regard to the prevention of burr formation between the press ram 4 and guide ring within the mouth entrance, but also ensuring the quality of the glass containers to be produced with regard to undesirable burr formation on the preform bottom seam.

[0046] The compensation of possible mass or weight fluctuations of the glass drop 1 is controlled by the stroke of the piston 9.1which, as already mentioned, can be achieved in various ways, preferably by measuring and evaluating the pressure applied to the piston. 9.1 due to the pressure in the tub 1.1 against the pressure force of the piston 9.1 acting gas pressure. This force causes the parison 1.1 finished pressed.

[0047] The mass or weight compensation prevents the penetration of glass mass into the gap 11.1 between pressing element 10 and preform profile 11 which prevents the undesirable formation of a ridge 19 on the preform base helps to avoid (see also Fig. 10a ) and thus serves to ensure the quality of the glass container to be manufactured in this area.

[0048] Due to the mass or weight compensation in the preform base press system 9 has the stamp tool 4but due to the limitation on the cover ring 6 always the same working end position regardless of the mass or weight of the glass gob 1 or Külbels 1.1 and the volume of the preform profile 11. This also results in a change in the position of the burr between the punch tool 4 and cover ring 6 into the area outside the mouth entrance. The resulting new position of the ridge, which is then no longer disturbing, 21 outside the mouth entrance in the area of ​​the mouth is not only here, but also in Fig. 10c This effect of the present invention significantly improves the ease of assembly and the sealing effect of internally sealed closures, as this change eliminates the risk of closure abrasion caused by a burr forming in the mouth area. As a result, the insertion force or friction of the closure when inserting the closure into the glass container is significantly reduced.

[0049] Fig. 8 shows the demoulding after completion of the pressing process, where the stamping tool 4 vertically downwards from the bucket 1.1 and the preform 2 and the preform base pressing system 9 vertically upwards and the preform 2 is opened.

[0050] Fig. 9 finally shows a transfer of the parison formed according to the invention 1.1to a finishing station, whereby in the illustration shown here, the arc pointing upwards to the right indicates a corresponding swivel movement of the parison 1.1 is indicated.

[0051] Fig. 10a and Fig. 10b show the problem of sharp-edged forming seams on the parison.

[0052] As already mentioned in the introduction, according to the state of the art according to EP 0 327 240 A1, which describes a device (cf. there for example Fig. 1 ) for a blow molding process for so-called IS ( Individual Section ) glass forming machines, so that sharp-edged forming seams can develop on the parison. According to EP 0 327 240 A1, the end working position of the press ram is determined by the resistance that occurs between the press ram and the parison being formed in the preform (i.e. the glass pressed against the preform and neck shape) and is therefore dependent on the volume of the preform recess and / or the mass or weight of the glass gob. Due to the fluctuations in the mass of the glass gob, the end working position of the press ram, which is designed to be slightly conical to almost cylindrical on its guide towards the neck shape, reaches different end positions in each case.

[0053] Towards the end of the pressing process, when the pressing ram has almost reached its final working position (which depends on the mass of the glass gob, assuming a fixed volume of the preform recess), it is guided and centered radially by a non-split guide ring.

[0054] Due to the guide play or gap between the guide ring and the press ram and the slight conicity of the press ram in this area, glass mass can get into the gap in certain operating situations, whereby the gap size depends on the respective end position of the press ram, which in turn depends on the mass of the glass gob (see above).

[0055] As already mentioned, the glass pressed onto the preform and mouth shape is called a parison 1.1 The position of the gap and thus the glass seam 20 is positioned directly at the parison inlet and in the process according to EP 0 327 240 A1 on the conical, almost cylindrical guide part of the press ram due to the weight compensation realized via the press ram resistance, which is required to compensate for the mass fluctuations of the glass gob.

[0056] However, the resulting sharp-edged glass seams or burrs can impair the sealing effect or assembly conditions between a glass container closure 20.2 and the glass container as well as sealing and thus pre-stressed closures or inserts within the mouth opening 20.1 damage and cause large vertical indentation forces, which is a disadvantage of this method according to EP 0 327 240 A1.

[0057] Fig. 10c shows a changed position of the ridge in the area of ​​the mouth entrance, which is achieved by the present invention, which uses the Fig. 10a and 10b avoids the disadvantages mentioned above by ensuring that the stamping tool is held firmly against the cover ring during the pressing process until its end 6 remains pressed and thus the disturbing burr that forms between the press ram and the guide ring according to the state of the art 20(see above) avoids, since now at most a non-disturbing ridge - if at all - forms outside the mouth entrance 21 results.

[0058] At the same time, the present invention ensures the formation of a preform base with a ridge 19 (see the left half of the illustration in Fig. 10a ) which is considerably reduced in size compared to the state of the art - if it still exists at all - and so in the subsequent final forming downwards to the bottom of the container in a curve to the position 19.1 can be blown (see the right half of the illustration in Fig. 10a ) and thus also ensures a high quality of the bottom of the glass container to be manufactured.

Claims

1. Blank mould baffle pressing system (9) for forming a burr-free mouth entry of a glass container to be produced, which comprises a piston (9.1) operated by the supply of gas pressure, preferably compressed air (18), and a pressing element (10) with a pressing element profile (10.3), whereby the piston (9.1), when subjected with gas pressure on one side, brings the blank mould baffle pressing system (9) into a pressing position against a glass gob (1) to be formed in a blank mould (2), and preforms a baffle for the glass container to be produced in the process of contact of the pressing element profile (10.3) with the glass gob (1), characterized in that the blank mould baffle pressing system (9) comprises a control or closed-loop-control of the stroke of the piston (9.1), which serves to compensate for mass fluctuations of the glass gob (1) by adapting this stroke to the respective glass gob mass, the blank mould baffle pressing system (9) having an internal cooling device for cooling by means of a cooling medium.

2. Blank mould baffle pressing system (9) for forming a burr-free mouth entry of a glass container to be produced according to claim 1, characterized in that the internal cooling device for cooling has a means that specifically distributes the cooling medium on the inner surfaces (17.1) of the pressing element (10).

3. Blank mould baffle pressing system (9) for forming a burr-free mouth entry of a glass container to be produced according to claim 1 or 2, characterized in that the means for targeted distribution of the cooling medium on the inner surfaces (17.1) of the pressing element (10) has a cooling medium supply line (16) for air for settle blowing of a glass machine as compressed air for cooling in the piston (9.1).

4. Blank mould baffle pressing system (9) for forming a burr-free mouth entry of a glass container to be produced according to any one of claims 1, 2 or 3, characterized in that the means for targeted distribution of the cooling medium on the inner surfaces (17.1) of the pressing element (10) has a cooling tube (9.5) arranged in the piston (9.1).

5. Blank mould baffle pressing system (9) for forming a burr-free mouth entry of a glass container to be produced according to claim 3 or 4, characterized in that the cooling medium is separated from the working area (22) of the piston (9.1) by a seal package (24) inserted at the cooling medium supply line (16).

6. Blank mould baffle pressing system (9) for forming a burr-free mouth entry of a glass container to be produced according to any one of claims 1 to 5, characterized in that the pressing element profile (10.3) has a convex or concave geometry curved towards the glass gob (1).

7. Blank mould baffle pressing system (9) for forming a burr-free mouth entry of a glass container to be produced according to any one of claims 1 to 6, characterized in that the pressing element (10) is attached to the piston (9.1) by means of a detachable connection.

8. Blank mould baffle pressing system (9) for forming a burr-free mouth entry of a glass container to be produced according to claim 7, characterized in that a thread (9.8) serves as the detachable connection.

9. Blank mould baffle pressing system (9) for forming a burr-free mouth entry of a glass container to be produced according to any one of claims 1 to 8, characterized in that the blank mould baffle pressing system (9) comprises springs (9.2) which press the pressing element (10) upwards against a preferably integrated stop surface (9.3) and thus keep it in the loading position as long as the piston (9.1) is not subjected with gas pressure.

10. Blank mould baffle pressing system (9) for forming a burr-free mouth entry of a glass container to be produced according to any one of claims 1 to 9, characterized in that the blank mould baffle pressing system (9) comprises a slide bearing (12) and a funnel guide (10.1) attached at the top in the blank mould (2), which guide the piston (9.1) with pressing element (10) axially to the blank mould profile (11) before the pressing element (10) immerses into the blank mould profile (11).

11. Method for producing a parison (1.1) using a blank mould baffle pressing system (9) according to any one of claims 1 to 10, wherein a) - preferably from a feeder - a glass gob (1) is loaded from above into a blank mould (2), and b) a plunger tool (4) is positioned in a loading position (8) as a falling limit for loading the glass gob (1) at the lower end of the blank mould (2), c) the blank mould baffle pressing system performs a vertical closing movement by being moved from above into the blank mould (2) until a stop (14) on the blank mould baffle pressing system (9) reaches a stop surface (15) on the blank mould (2), whereby the piston (9.1) is initially not subjected to gas pressure, but then shortly before or when reaching the stop surface (15) is subjected to gas pressure and is thus pressed down to the stop surface (15), whereby the pressing element (10) is in pressing position, and whereby a compensation for mass fluctuations of the glass gob (1) is achieved via a control or closed-loop-control of the piston stroke, by adapting this stroke to the respective glass gob mass, d) during the vertical closing movement of the blank mould baffle pressing system (9), the plunger tool (4) is furthermore pressed against the parison (1.1) forming in the blank mould (2) upwards against the pressing element (10) in pressing position, until the plunger tool (4) with its plunger surface (4.1) stops against a guidering surface (6.1), against which it is pressed until the pressing process is completed, and e) after completion of the pressing process, a demoulding takes place, whereby the plunger tool (4) is moved vertically downwards and the blank mould baffle pressing system (9) is driven out vertically upwards and the blank mould (2) is opened, whereupon a handover to a final shaping station can take place, whereby the blank mould baffle pressing system (9) is cooled during the production of the parison (1.1) by means of an internal cooling device of the blank mould baffle pressing system (9) with a cooling medium, preferably compressed air.

12. Method according to claim 11 for producing a parison (1.1) using a blank mould baffle pressing system (9) according to any one of claims 2 to 10, characterized in that the cooling medium, preferably pressurized settle blow air from a glass machine, is specifically distributed for cooling on the inner surfaces (17.1) of the pressing element (11)13. Method according to claim 12 for producing a parison (1.1) using a blank mould baffle pressing system (9) according to claim 9 or 10, characterized in that while the blank mould baffle pressing system (9) performs a vertical closing movement by being lowered from above into the blank mould (2) and as long as the piston (9.1) is not yet subjected to gas pressure, the piston (9.1) is pressed vertically upwards against a preferably integrated stop surface (9.3) by means of the springs (9.2) of the blank mould baffle pressing system (9) and thus held in loading position.

14. Method according to claim 13 for producing a parison (1.1) using a blank mould baffle pressing system (9) according to claim 10, characterized in that while the blank mould baffle pressing system (9) performs a vertical closing movement by being lowered from above into the blank mould (2), the pressing element (10) is axially aligned at the upper funnel guide (10.1) and through the slide bearing (12) before the lower guide diameter (10.2) of the pressing element (10) dips into the blank mould profile (11) to prevent a pressing element edge (13) from tilting with the blank mould profile (11).