MXPA98006429A - Method and apparatus for cooling a machine-building stamp to manufacture vid objects - Google Patents

Abstract

The present invention relates to a hollow parison (P) of a glass container, which is formed from a guttiform mass of molten glass, the parison has a body portion (B) with a closed end and an open end. The body portion of the parison is formed in an annular forming die (14). The parison also has a terminal portion (F) at the open end of the body portion of the parison, the terminal portion being formed by an annular mold (16) for the formation of the mouth or neck (26) which is placed against a end of the forming stamp, during the formation of the parison. An annular jaw (26) surrounds a portion extending substantially axially of the forming die. The annular cage receives cooling air and directs the cooling air against cooling fins (24) which are on the outside of the forming die to cool the body portion of the parison while it is in the air. forming stamp. Exhausted or already used cooling fluid from the annular cage flows from there through an opening that is aligned with the open end of the body portion of the parison. The annular cage can slide axially along the longitudinal central axis of the forming die with respect to the forming die and is biased away from the annular mold for the formation of the mouth or neck, by means of a compression spring (32) that it is trapped between an annular pressure plate (34) and a portion of the annular cage. The cooling air that comes out from the hole in the annular cage is forced to flow through the ring mold for the formation of the mouth or neck to help in the cooling of the terminal portion of the parison, by means of an annular skirt ( 36) that is located below the annular pressure plate, and towards the annular mold for the formation of the

Description

METHOD AND APPARATUS FOR THE COOLING OF A FORMING STAMP OF A MACHINE TO MANUFACTURE GLASS OBJECTS FIELD OF THE INVENTION This invention relates to a method and apparatus, for cooling a parison of molten glass, in a forming die of a machine for the formation of glass objects, of the individual section type ("S.I."). More particularly, the invention relates to a method and apparatus for cooling the terminal portion of a parison of molten glass while it is placed in that forming die.

BACKGROUND OF THE INVENTION Hollow glass items, such as bottles and jars, when molded with a type S forming machine. I. , they are molded in two steps. In the first step, a preform of the final container, namely an article with a closed end and an open end, which is usually called a blank or parison, is REF .: 28118 molded through an annular mold formed by a pair of matching stamper sections. At the end of the molding step of the blank, the sections of the forming die are separated and the blank or parison is transferred to another molding station, often called a blow molding station, where it is blown until acquire its final shape, by means of another ring mold that is constituted of another pair of molding sections, co inci dent es. At the conclusion of the blow molding process, the matching sections of the blow mold are separated, and the container is removed from the forming machine for further processing. The gutiform mass of molten idio, which is given the shape of a parison, in the forming stamp of a SI machine, is hot enough to be possible to give it the shape of a parison, and therefore has a large amount of latent heat. Much of this heat must be removed before the container is removed from the mold with blowing, from the forming machine, however the finished container must still be sufficiently rigid to undergo additional processing without any change in its shape. In this way a lot of heat must be removed from the container that is formed, both during the molding step of the blank and in the blow molding step, and unless the heat is removed at a rapid rate, the productivity of the machine trainer will be unduly viewed 1. The problem of heat removal, from the molds of an SI forming machine, at a suitable speed, is especially important in the molding station of the blank, because the surface area of the parison is quite small due to the small diameter of the mold. parison, which limits the speed at which the heat can be removed, and the amount of heat to be removed is quite large due to the greater wall thicknesses of the parison, compared to the wall thicknesses of a finished container . An approach to the cooling of parisons, in a stamping station forming a machine S.I., is described in U.S. Patent No. 3,580,712 (Mumford), the description of which is incorporated herein by reference. The process described in U.S. Patent 3,580,712, mentioned above, is occasionally referred to as "process 41". A parison that forms in the forming stamp of a machine S.I. it has a body portion and a "terminal" portion. The terminal portion is the portion of the parison that is immediately below the rim, at the open end of the parison, and the terminal portion is usually molded to generate a receiving configuration of a closure or cap, threaded or otherwise, by a pair of mold elements for the mouth or neck, co incidents, which are placed in a position adjacent to the elements of the forming die, in the forming die station, during the formation of the parison. The arrangement or configuration of Patent 3No. 580,712, mentioned above, which serves to cool the body portion of a parison, directing cooling air against the outside of the forming die sections, is not effective in cooling the terminal portion of the parison because the mold elements for mouth they are not exposed to be able to make contact with the cooling air, as are the elements of the forming die. Thus, in arrangements similar to those of Patent No. 3,580,712, the cooling of the terminal portion occurs primarily by the conduction of heat from the elements of the mold for the mouth to the elements of the forming die, rather than through of the convection of a cooling air stream. The cooling of the mold for the mouth, by means of such an arrangement, is somewhat slower than the cooling of the forming die, resulting therefrom and, unless the removal of the parison, from the forming die station, is delayed somewhat, this will lead to some inaccuracy in the dimensions of the terminal portion of the parison, due to temperature differences between the terminal portion of the parison and the body portion of the parison. Problems related to the cooling of the mold elements for the mouth, in a stamping station forming a machine for the manufacture of glass objects, of the SI type, are analyzed in US Pat. No. 5,516,352 (Bogert et al.) No. 5,538,542 (Johnson et al.) And No. 4,659,357 (Doud). However, the arrangements or arrangements of these references are complex and require many additional structures for the implementation of the cooling processes described therein.

BRIEF DESCRIPTION OF THE INVENTION In accordance with the present invention there is provided a method and apparatus for increasing the rate at which heat is removed from the terminal portion of a parison, in a stamping die of an SI machine, as compared to the arrangements for the cooling of the stamps. prior art formers, and to do so in a manner such that significant amounts of additional structure are not required to the structure required in the forming die station. As in arrangements for the cooling of known forming dies, the body portion of the parison is cooled by sending cooling air from a box surrounding the elements of the forming die against the outer parts of the forming die elements. Instead of expelling the spent cooling air, after it flows and withdraws, having already made contact with the elements of the forming die, in those arrangements for the cooling of the mold, of the prior art, according to the present invention , the spent cooling air, which still retains or retains ample cooling capacity, is deflected and caused to pass through the outer parts of the mold elements for the mouth, thereby increasing the speed at which the heat away from the terminal portion of the parison, in relation to the speed at which it would be transferred in another way, mainly by conduction of the elements of the mold for the mouth, to the elements of the forming die. Accordingly, an object of the present invention is to provide an improved method and apparatus for cooling a parison of molten glass in a die forming machine for the manufacture of glass containers. More particularly, an object of the present invention is to provide a method and apparatus of the character described, to increase the rate at which heat is transferred from a terminal portion of the parison. For a better understanding of the present invention and of the objects thereof, attention is drawn to the drawing and to the following brief description thereof, to the detailed description of the preferred embodiment and to the rei annexed indications.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a fragmentary plan view of a portion of a machine for the manufacture of glass containers, incorporating the apparatus for cooling the forming die, in accordance with the preferred embodiment of the present invention; Y Fig. 2 is a sectional view taken along line 2-2 of Fig. 1.

DETAILED DESCRIPTION OF THE PREFERRED MODALITY Figure 1 illustrates a support arm 10 of the forming die, of a machine for the manufacture of glass containers, of the individual section type ("SI"), the support arm 10 extends, in general, horizontally and is supported from a support shaft 12 extending vertically. The support arm 10 supports one or more forming punches 14, shown as three of those stamps, as required for the manufacture of glass containers by a machine of the SI type, according to the process of triple gutiform mass, a process in which three containers are manufactured simultaneously in each section of the machine. Of course it is also contemplated that a different number of those forming stamps 14 may be employed, for example, two of those stamps for a SI type machine, used to form two containers at the same time, in accordance with the process of double gooseneck , or four of those stamps for a machine of type SI, used to make four containers at a time, in accordance with the quadruple process, as is known in the art. As shown in Figure 2, each forming die 14 is used to form a parison P from a gut shaped mass of molten glass, the parison P has a body portion B that is surrounded by the forming die 14 and a terminal portion. F which is located beyond the extension of the body portion B. As shown, the parison P is molded in an inverted position, relative to the position it is intended to occupy after a container is formed therefrom, that is, with its terminal portion F below its portion B. In all in the case, the portion B has a closed end withdrawn from the terminal portion F, and the terminal portion F, which is externally threaded or otherwise configured to receive a closure or cover, is formed by a mold 16 for the mouth, which is occasionally referred to as a ring for the mouth or neck. In that respect, the forming die 14 is constructed of a pair of mold elements 14a, 14b, s emi ci 1, co-incidents, which are joined end-to-end during the molding of the parison P, but which are separated after the molding of the parison P has been completed to allow the parison P to be removed from the forming die 14. Similarly the mold 16 for the mouth is constituted by a pair of mold elements for the mouth, as shown in FIG. The mold elements for the mouth 16a, 16b are transported by an inversion arm 18 which transfers the parison P while the molding elements 16a, 16b are joined together, 16a, 16b, which are joined end to end during the molding of the parison P. this is carried by the mold 16 for the mouth, in its closed condition, to a blow mold station (not shown), through a 180 ° turning movement, in a vertical plane, after the forming die 14 has been opened to allow the parison P to be removed from the ma, as is known in the art. In the modality illustrated in Figure 2, the parison P is formed by pressure, in a process known as the pressure and blowing process, and for this purpose a reciprocating punch 20 is provided to move in the forming die 14, through the mold 16 for the mouth, to provide the parison P with its illustrated form, as is known in the art. However, also, as is known in the art, parisons can be formed without the use of a reciprocating piston or punch corresponding to punch 20, by blowing, in a process known as the blow and blow process, a process that also requires a mold for the mouth corresponding to the mouth mold 16, to form a terminal portion F of a parison blown in another way, and it is considered that the present invention is also applicable to parisons formed by the blowing and blowing process. With the process of pressing and blowing, or with the blowing and blowing process, either of both, the upper end of the mouth mold 14 is opened to receive a gob with molten glass, and then closed by a dividing plate 22 for allow the closed end of the parison P to be formed adequately during pressure or blowing. The element 14b of the forming die is provided with a plurality of thin fins 24 positioned circumferentially and extending radially from the exterior thereof, the cooling fins 24 being separated in a circumferential arrangement or arrangement. The cooling fins 24 extend through a substantial portion of the vertical extension of the body portion B of the parison P and serve to assist the element 14b of the forming die transfer heat from the body portion B while the parison P is still surrounded by the forming die 14. In this respect the parison P must be cooled in the forming die 14, to a certain degree, from its forming temperature, so that it can support itself during its transfer the mold with blow , and without losing its desired shape, during that transfer step. The cooling of the body portion B of the parison P is intensified by circulating cooling air over the cooling fins 24, and for that purpose the forming die 14 is surrounded by a cage or annular structure 26 which receives cooling air from a source (not shown) and directs the cooling air against and between the cooling fins 24 so that it flows out of the cage 26 and through a hole at the bottom of the cage 26. To allow proper seating of the forming die 14 with respect to the mouth mold 16, the cage 26 is secured to the forming die 14 to allow some relative vertical movement therebetween, and for that purpose is attached to the cage 26 a wedge 28 that projects radially inwardly and is received in a recess 30 oriented radially outward in the forming die 14. The recess 30 has a vertical extension that is somewhat larger than the thickness of the wedge 28, and the cage 26 is deflected resiliently towards the upper extent of the recess 30 by a compression spring 32. The bottom of the compression spring 32 is constrained by a pressure plate 34 which deflects against vertically extending projections 24a of each of the cooling fins 24, the projections 24a of the cooling fins 24 are preferably aligned with one another in a horizontal plane. To assist in the cooling of the terminal portion F of the parison P, while the parison P is placed in the forming die 14, a skirt 36 hanging downwards is provided, against the position of the cooling fins 24 and below the position of the cooling fins 24. projections 24a, immediately below the pressure plate 34, to direct the cooling air leaving the cage 26, which still has a substantial cooling capacity.what? , downward and passing through an annular portion 38 that projects radially outwardly from the mouth mold 16. To that end, if reed, the radially outermost and lowest portion of the forming die 14 is interrupted at point 40 to further direct cooling air from the cage 26 past the annular portion 38 of the mold 16 for mouth. In this way, the cooling rate of the terminal portion F of the parison P will be increased such that the transfer of the parison P from the mold 14 for the mouth to the mold with the blow does not have to be unduly delayed to ensure that the terminal portion F is suitably cooled to be dimensionally stable during the transfer step and during the blowing of a container from the parison P. Although the best way contemplated by the inventors has been shown and described here, to carry After the present invention, until the date of presentation thereof, it will be apparent to those skilled in the art that suitable modifications, variations and ealents can be made, without departing from the scope of the invention, and the scope will be it is limited only by the terms of the following claims and the legal ealents thereof.

It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention. Having described the invention as above, property is claimed as contained in the following:

Claims (6)

1. A method for molding a parison of a glass container, characterized in that it comprises the steps of: providing a mold with an internal cavity formed by a pair of mold elements, matching or attachable, separable, to form the exterior of a body portion from the parison; providing a mold for the formation of the mouth or neck of the container, with an internal cavity constituted by a pair of separable mold elements for the mouth; place the mold for the mouth and the other mold, one against the other; introducing a guttiform mass of molten glass, into the mold, and giving shape, to the gutiform mass, of a portion of the parison body, having an exterior that molds to the internal cavity of the mold and forms a terminal portion of the mass gutiform to generate the portion of mouth or neck of the parison, leaving an exterior that molds to the internal cavity of the mold that is used for the formation of the neck or mouth; cooling the portion of the body of the parison by sending cooling air from a cage, generally annular, against the outside of the mold; and cooling the mouth or neck portion of the parison by sending cooling air from the cage, generally annular, against an outer portion of the mold that it uses for the formation of the mouth or neck K >

2. An apparatus for molding a parison of a glass container, from a guttiform mass of molten glass, the apparatus is characterized in that it comprises an annular mold means, having an internal cavity for the formation of the exterior of a parison body portion, the body portion has a closed end and an open end; an annular neck or mouth forming mold means having an internal cavity for molding a terminal portion of the parison, the annular mouth mold is positioned adjacent the annular mold means during molding of the parison, to form the terminal portion of the parison adjacent to the open end of the body portion of the parison; means for forming an internal cavity in the body portion of the parison and a hole or opening extending through the terminal portion of the parison; an annular cage surrounding a substantial portion of the annular mold means and not surrounding any portion of the annular mold means for the formation of the mouth or neck, the annular cage is adapted to receive a stream of cooling fluid and to distribute the cooling fluid against the outside of the mold means, for cooling at least a body portion of the parison; and means for causing the cooling fluid, exhausted or already used, coming from the annular cage to flow with an annular pattern passing through at least a portion of the annular mold means for the formation of the mouth, and assist in the cooling of the terminal portion of the parison.

An apparatus according to claim 2, characterized in that it further comprises: means for positioning the annular cage with respect to the annular mold means, to allow relative movement between the annular cage and the annular mold means, along a longitudinal central axis of the annular mold means.

4. An apparatus according to claim 3, characterized in that the means for positioning comprises: a pressure plate, annular, fixedly positioned with respect to the annular mold means, the annular cage can be moved with respect to the pressure plate cancel; and a compression ring means surrounding the annular mold means and trapping it between the annular pressure plate and a portion of the annular cage to deflect the annular cage to a position removed from the annular pressure plate.

5. An apparatus according to claim 4, characterized in that an exterior of the annular cage defines an opening for the cooling fluid to flow from the annular cage at a location near the open end of the body portion of the parison; and wherein the means that is used to cause the spent or used cooling fluid to flow from the annular cage, comprises an annular skirt of position below the pressure plate placed in the opening to cause the cooling fluid to run out flow through at least a portion of the annular mold means for the formation of the mouth or neck.

6. An apparatus according to claim 1, characterized in that the means for forming an internal cavity comprises a reciprocating punch, the reciprocating punch is adapted to extend through the annular mold means for the formation of the mouth or neck, and towards the ring mold means. SUMMARY OF THE INVENTION The present invention relates to a hollow parison (P) of a glass container, which is formed from a guttiform mass of molten glass, the parison has a body portion (B) with a closed end and an open end. The body portion of the parison is formed in an annular forming die (14). The parison also has a terminal portion (F) at the open end of the body portion of the parison, the terminal portion being formed by an annular mold (16) for the formation of the mouth or neck (26) which is placed against a end of the forming stamp, during the formation of the parison. An annular cage (26) surrounds a portion extending substantially axially of the forming die. The annular cage receives cooling air and directs the cooling air against cooling fins (24) which are on the outside of the forming die, to cool the body portion of the parison while it is in the stamp. trainer Exhausted or already used cooling fluid from the annular cage flows there through an opening that is aligned with the open end of the portion of the parison body. The annular cage can slide axially along the longitudinal central axis of the forming die with respect to the forming die and is biased away from the annular mold for the formation of the mouth or neck, by means of a compression spring (32) that it is trapped between an annular pressure plate (34) and a portion of the annular cage. The cooling air that comes out from the hole in the annular cage is forced to flow through the ring mold for the formation of the mouth or neck to help in the cooling of the terminal portion of the parison, by means of an annular skirt ( 36) which is located below the annular pressure plate, and towards the annular mold for the formation of the mouth.