MXPA97005347A - Mounting of mold for articles of vid - Google Patents

Abstract

The present invention relates to a mold assembly for molding a hollow glass article at an elevated temperature, the mold assembly is characterized in that it comprises: an annular mold having an internal cavity, the annular mold is formed by a pair of mold elements separable, the mold elements are positioned end to end during a molding step, each of the mold elements having a plurality of fins extending axially on an outer surface thereof, the outer tips of each of the mold elements. plurality of fins define a curved surface, an annular mold receptacle surrounding at least a substantial portion of the axial length of the annular mold, the annular mold receptacle is formed by a pair of sections of the separable mold receptacle, the receptacle sections of the annular mold. mold are positioned end to end during a molding stage, each of the sections of the receptacle of the mold have a conduit for flowing fluid, which extends generally in the axial length, each fluid flow conduit is open to allow the fluid to flow therethrough to flow outwardly therefrom against the fins of a fluid element. adjacent mold assist in the cooling of a hollow glass articles in the annular mold and a pair of perforated plates, each of the perforated plates is curved to conform the curved surface defined by each of the plurality of fins of an adjacent of the mold elements of the annular mold and are positioned closely adjacent to the outer tips of each of the plurality of fins to control the speed and pattern of fluid flowing from one of the mold receptacle sections against the mold element fins adjacent

Description

Mold assembly for glassware FIELD OF THE INVENTION This invention relates to a mold assembly for use in the production of hollow glass articles in a molding machine of the individual section type ("I.S."). More particularly, this invention relates to a prior art mold assembly that provides positive indirect cooling of the article being molded in the mold assembly.

BACKGROUND OF THE INVENTION Hollow glass articles, such as bottles and jars, when molded in a type I.S. molding machine, are molded in two stages. In the first step, a preform of the finished container, which is usually called a preform or a parison, is molded into an annular mold made of a pair of mold sections of the preform that engage. At the end of the molding step of the preform, the mold sections of the preform are separated and the preform or parison is transferred to another blow molding station, often called the mold blowing station, where it is blown into the mold. interior to take its final form by another ring mold that is in fact another coupled pair of mold sections. At the conclusion of the process REF: 25268 blow molding, the coupled sections of the blow mold are separated, and the container is removed from the molding machine to continue processing. The gutiform mass of glass that is formed in a preform in the mold of the preform of a machine I.S. it is hot enough to be able to take shape in a hollow mold and, to that degree, possesses a high level of latent heat. Much of this heat must be removed before the container is removed from the blow mold of the molding machine, however, so that the finished container will be sufficiently rigid to withstand further processing without any change in its shape. In this way, a lot of heat must be removed from the container being molded, during the molding step of the preform and the blow molding stage, and unless the heat is removed at a fast speed, the productivity of the molding machine is unduly limited The problem of removing heat from the molds of a shaping machine I.S. at an adequate speed is especially important in the molding station of the preform because the surface area of the parison is very small due to the small diameter of the prefinish, which limits the speed at which the heat can be removed, and the amount of heat to being removed is too large due to the greater wall thickness of the parison compared to the wall thickness of a finished container. Several artisans of the art have spoken before of problems encountered in the cooling of molded glass articles with an I machine. S. , as stated in the U.S. Patents 3,887,350 (Jenkins), 4,657,573 (Jones), 4,668,269 (Cantu-Garcia et al.), 4,690,703 (Kulig), 4,783,212 (Loffler) and 5,364,437 (Bolin), each of which is incorporated herein by reference. The problems of the aforementioned and other preceding approaches of the art for cooling the mold of the molds of the machine I.S. is that it increases considerably the complexity, as well as the cost, of the molds of the molding machine, each set of these is specially designed for only a single type of product. Thus, it is advantageous to incorporate both the required cooling structure of the mold into another structure of a forming machine I.S. that does not need to be changed every time a set of molds, replaced to allow the machine to manufacture containers of different type, size or design.

BRIEF DESCRIPTION OF THE INVENTION In accordance with the present invention, a mold assembly for a glass forming machine of the type I.S. The mold assembly includes an annular mold, which is made of a coupled pair of mold sections, whose inner surface, when the mold sections are end-to-end together, they define the external shape of a glass article to be formed in an internal cavity of the annular mold, whether of the final shape of a glass article in the case of a blow mold or the shape of a preform of the article in a mold of the preform. The exterior of each of the sections of the mold is provided with a circumferential plurality of spaced grooves that extend axially, projecting radially to extend the surface of the sections of the mold to thereby increase the speed at which the latent heat can be removed. of the molten glass item inside the mold. The mold assembly also includes a split mold receptacle for securing the mold sections of a mold, as described above. The mold receptacle, which is suitable for use with a variety of molds, surrounds the mold and directs air or other cooling fluid radially inward against the recesses on the outside of the mold sections from the radial inlet, passing the flow Axially extended. A slit, of the perforated plate, is directed into each of the sections of the mold receptacle and controls the distribution of the cooling fluid flow against the mold. Thus, by controlling the pattern of perforations in the perforated plate, it is possible to vary the cooling rate of the sections of the mold, circumferentially and axially, to equalize the cooling rate of the glass article in the mold, despite the variations in the thickness or shape of the glass article, which effects the speed at which the latent heat is removed from different places of the glass article. Because the sections of the mold receptacle, and the sections of the perforated plate that are attached to them, can be used with a variety of molds, the costs of making the molds are reduced in comparison to the costs of the molds whose flow conduits of cooling are contained in the same molds. Therefore, it is an object of the present invention to provide an improved mold assembly for a glass forming machine. More particularly, it is an object of the present invention to provide a mold assembly of the above character with improved indirect cooling of a molten glass article being molded therein. Even more particular, it is an object of the present invention to provide a prior art mold assembly of reduced structural complexity of the mold. To further understand the present invention and the objects above, attention is directed to the drawings and the following description of the foregoing, to the detailed description of the preferred embodiment and to the appendix of claims.

Brief description of the drawings Figure 1 is a perspective view of a mold assembly in accordance with a preferred embodiment of the adaptation of the present invention to the mold station of the preform of a glass forming machine I.S .; Figure 2 is a plan view, partly sectioned and on an enlarged scale, of the mold assembly of Figure 1; Figure 3 is a fragmentary elevated view, cross-sectioned and on an enlarged scale, of the mold assembly of Figure 1; Figure 4 is an elevated view of a section of the mold, of the interior or of the internal cavity facing outwards, of a mold assembly in accordance with a preferred embodiment of the adaptation of the present invention to the blow molding station of the glass molding machine I. S.; Figure 5 is a top plan view of the section of the mold shown in Figure 4; Figure 6 is a sectional view taken on line 6-6 of Figure 4; Figure 7 is a plan view of the base section of the mold of Figures 4-6; Figure 8 is a sectional view taken on line 8-8 of Figure 5; and Figure 9 is a sectional view taken on line 9-9 of Figure 6.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A mold assembly in accordance with the preferred embodiment of the present invention is generally identified by the reference number 10 in Fig. I, and is made of an annular mold 12, which is illustrated as being suitable to be used in the formation of a preform of a glass container. The mold assembly 10 also includes an annular mold receptacle 14, which includes a substantial portion of the axial length of the mold 12 and is a part of a glass container molding machine I.S. or at least it is a part that does not need to be replaced when the mold 12 is replaced. The annular mold 12 is generally made of semi-cylindrical mold elements 12a, 12b, which, when they are joined end to end during a molding operation, substantially enclose a glass article that is being molded in its interior cavity. The elements of the mold 12a, 12b are separated from each other at the end of a molding step, to allow a molded article to be removed therefrom, as is known in the art. In that regard, each of the elements of the mold 12a, 12b is provided with a tongue 12c and a groove 12d, which are diametrically opposed to each other, to allow the elements of the mold 12a, 12b to be aligned precisely one with the other during the molding operation. Each of the elements 12a, 12b is also provided with a radially projected circumferential arrangement and axially extended series of spaced fins 12e, engaged in the cooling of a glass article being molded into the mold 12 to make the article of more rigid and self-supporting glass that would otherwise require high molding temperature. The mold receptacle 14 is generally made of semi-cylindrical receptacle sections 16, 18, which are positioned substantially end to end during a molding step but separate from one another at the conclusion of a molding step when the mold elements 12a, 12b are separated from one another to remove an article molded therefrom. Each of the sections of the receptacle 16, 18 generally has a semi-cylindrical flow conduit 20 extending axially along. The duct 20, which is radially open therein, serves to allow cold air or other cooling means, from a source described hereinafter in greater detail, to flow against the fins I2e of the sections of the mold 12a, 12b for participate in the indirect cooling of a glass article that is being molded into the mold 12. The cooling air flows into the flow conduit 20 of the sections of the mold receptacle 16, 18 from a plenum 22 at the bottom of the receptacle of the mold 14 through a series of circumferentially spaced apertures 24. From the flow conduits 20 the cold air flows radially inwardly against the sections of the mold 12a12b, generally semi-cylindrical, the perforated plates 26 which are fixed inside the sections of the mold receptacle 16, 18. The perforations in the perforated plates 26 are dimensioned and spaced to vary the distribution of the cold air flow vertically, and circumferentially if desired, with respect to the exteriors of the mold sections 12a, 12b to equalize the cooling rate of the article in the mold 12, despite variations in the cooling load due to localized variations in diameter or thickness of the wall of the glass article. The sections 16, 18 of the mold receptacle 14 have less axial extension than the mold sections 12a, 12b and are centered with respect to the mold elements 12a, 12b. In this way, the cooling air of the mold receptacle 14 can exit to the outside of the mold elements 12a, 12b through the openings 28, 30 above and below, respectively, of the mold receptacle 14, in the orientation illustrated in FIG. Fig. 3. The ends of the sections of the mold receptacle 16, 18 are secured by uncoupling them in pairs diametrically opposite the vertically extended connectors 32, 34 by plug screws 36. The connectors 32, 34 have tabs projecting radially inside. 32a, 32b and 34a, 34b respectively, which are received in grooves of the mold elements 12a, 12b to secure the circumferential position of the mold receptacle sections 16, 18 with respect to the mold elements 12a, 12b. The tabs 32a, 32b and 34a, 34b also engage the free ends of the plate 26 to secure the circumferential position of the plates 26 with respect to the mold receptacle sections 16, 18 respectively. In addition, the fins 12e of the mold elements 12a, 12b have radially outwardly projecting portions 12ex, 12eXI above and below, respectively, of each of the fins 12e. The portions 12ex, 12eIX have edges for engaging up and down the sections of the mold receptacle 16, 18, respectively, to secure the axial position of the sections of the mold receptacle 16, 18 with respect to the elements of the mold 12a, 12b , respectively. Figs. 4-9 illustrate an assembly 40 which is made of a section of the mold 42 contained within a section 46 of a mold receptacle 44. It is understood that the assembly 40 is annular in configuration during a molding operation with the mold section 42 joined end to end with an equal mold section, not shown. Similarly, the mold receptacle 44 is annular in configuration during a molding operation with the mold receptacle section 46 attached end-to-end with an equal mold receptacle section, also not shown. In any case, the mold assembly 40 is shown as being of the type suitable for use in a machine I. S. in the preforming of the final molding, or blown, stage of a molten glass parison of the type that has previously been formed in a parison molding assembly 10, as shown and described above. Because the assembly 40 is designed for use in the blow molding station of an IS machine, while the mold assembly 10 is designed for use in the mold station of the preform of the same machine, the internal diameter of the section of the mold 42, often referred to as the cavity, will be substantially larger than that of the annular mold 12 of the mold assembly 10, and the wall thickness of a glass article in engagement with the mold section 42 will be substantially less than that of the mold. coupled with the annular mold 12. The mold section 42 is provided with a series of axially extending, spaced apart fins circumferentially positioned projecting out of the mold section 42 to increase the outer surface of the mold section 42, and thus increasing the rate at which the heat of the glass article being blow molded can be transferred into the mold assembly 40. The heat of the art. the glass that has been transferred to the fins 42e is transferred positively towards the fins 42e forced by the cold air, and in this regard the section of the mold receptacle 46 is generally provided with a semi-cylindrical flow conduit 50 extending axially along. The flow conduit 50 receives cool air through an inlet 52, and is radially open therein to allow cold air to flow radially outwardly of the flow conduit 50 against the fins 42e of the mold section 42. A plate perforated 56, which is generally semi-cylindrical in shape, is fixed to the interior of the mold receptacle section 46. The perforations in the perforated plate 56 are dimensioned and spaced to vary the vertical, circumferential and cold distribution air flow. if desired, to equalize the cooling rate of an article being molded in the mold assembly 40, despite variations in the cooling load due to localized variations in the diameter or thickness of the glass article wall . As best shown in Figs. 8 and 9, the mold receptacle section 46 has less axial extension than the mold section 42. The mold section 42 is centered vertically with respect to the mold receptacle section 46 to provide the mold section 42 with a slit. on the outer face 42d receiving an inwardly projecting tooth 46a of the mold receptacle section 46, and further providing the mold section 42 with a downwardly projecting screen 42f seating by touching the highest surface of the section of the mold receptacle 46. The mold section 42 is protected by decoupling the mold receptacle section 46 by a vertical series of spaced plug screws 66 (Fig. 8) that extend through the mold receptacle section 46 to receive them. through the section of the mold 42. To assist in the proper blowing of a glass article in the section of the mold 42 against the inside of the section of the mold 42, vacuum is provided to help stretch the molten glass article on the inner surface side of the mold section 42. Finally, a diametrically opposed pair of vertical vacuum grooves 70 are present in the mold section 42 , and each of the vacuum slits 70 are connected to a vacuum source, not shown, by means of a vacuum wrench 68. The vacuum in the vacuum conduit 70 is applied to the bottom of a molded article in the section of the mold 42 by a circumferentially spaced series of radially extending vacuum duct extensions 70a. The vacuum slits 70 are provided with openings 72 above the bottom to ensure that the air contained within each vacuum slit does not stagnate. The best way known to the inventors to perform the present invention until the date of the invention has been shown and described here, but it would be evident to those practices in the art that suitable modifications, variations, and equivalents would be made without departing from the object of the invention. , the objective is limited only by the terms of the following reivifications and the legal equivalents thereof.

Claims (9)

1. A mold assembly for molding a hollow glass article at an elevated temperature, said mold assembly is characterized in that it comprises: an annular mold having an internal cavity, said annular mold being formed by a pair of separable mold elements, said elements of mold are positioned end to end during a molding step, each of said mold elements having a plurality of fins on an outer surface thereof; and an annular mold receptacle surrounding at least a substantial portion of the axial length of said annular mold, said annular mold receptacle being formed by a pair of separable mold receptacle sections, said sections of the mold receptacle being positioned end with At the end during a molding step, each of said sections of the mold receptacle has a conduit for fluid to flow, generally extending in axial length, each fluid flow conduit is open to allow the fluid to flow through it. to flow outward therefrom on the side of the fins of an adjacent mold element to assist in cooling a hollow glass article in said annular mold.

2. A mold assembly according to claim 1, characterized in that it further comprises: a pair of perforated plates each of said perforated plates is fixed to one of said sections of the mold receptacle at a place between the flow conduit of the mold. fluid and the fins of the mold element adjoin;, of said annular mold and serve to control the flow pattern of each of said sections of the mold receptacle on the side of the fins of said adjacent mold member.

3. A mold assembly according to claim 1, characterized in that it further comprises: a plenum chamber means carried by said recess of the annular mold to supply cooling fluid to the fluid flow conduit of each of the sections of the mold receptacle of the mold. said annular mold receptacle.

4. A mold assembly according to claim 1, characterized in that it further comprises: first and second pairs of connectors, the connectors of each of said pairs are secured at the opposite free ends of one of said handle sections of the annular mold , each of said connectors has a tongue projecting inwards; each of said elements of the mold has a pair of recesses projected towards the interior; the tongue projecting inward from each pair of connectors is received in a recess of one of said pairs of mold elements to secure the circumferential position of each pair of connectors in the section of the mold receptacle that is secured with respect to one of said mold members. adjacent mold elements.

A mold assembly according to claim 4, characterized in that: at least one of the fins supported by each of said pair of mold elements has been spaced up and down radially in enlarged portions, said radially enlarged portions catching a section of the adjacent mold receptacle to secure the axial position of each of said pair of mold elements with respect to said adjacent said mold receptacle sections.

6. A mold assembly according to claim 1, characterized in that: each of the pair of the separable mold elements is substantially of semi-cylindrical configuration, each of the pair of sections of the separable mold receptacle being south. - substantially of semi-cylindrical configuration, and the fluid flow conduit in each section of the mold receptacle is substantially semi-cylindrical in shape

7. A mold assembly according to claim 1, characterized in that it further comprises: extending more quickly through each of said sections of the mold receptacle, said faster means is received in an adjacent of said sections of the mold, to securely release said adjacent of said sections of the mold through the section of the receptacle of the mold of said medium spread faster.

8. A mold assembly according to claim 7, characterized in that one of said sections of the mold receptacle and said mold sections has a groove giving from one adjacent to the other said sections of the mold receptacle and said mold sections, and wherein the other of said sections of the mold receptacle and said mold sections has a tongue extending to an adjacent said mold receptacle sections and said mold sections, said tongue being received in said mold to secure the position axial of each of said sections of the mold receptacle and said adjacent of said mold sections with respect to the other.

9. A mold assembly for molding a hollow glass article at an elevated temperature, characterized in that said mold assembly comprises: an annular mold having an internal cavity, said annular mold being formed by a pair of separable mold elements, said mold elements are positioned end to end during a molding step, each of said mold elements having a plurality of fins on an outer surface, the outer tips of said fins defining a curved surface; an annular mold receptacle comprising at least a substantial portion of the axial length of said annular mold, said annular mold receptacle being formed by a pair of separable mold receptacle sections, said sections of the mold receptacle being positioned end to end during a molding step, each of said sections of the mold receptacle has a conduit for flowing fluid that extends generally in the axial length, each fluid flow conduit is open to allow the fluid to flow outward on the side of the mold. the fins of an adjacent mold element that aids in the cooling of a hollow glass article in said annular mold; a pair of perforated plates each of said perforated plates is curved to form the curved surface defined by each of said fins of an adjacent of said mold elements of said annular mold and are positioned near the adjacent one towards the outer tips of each one. of the fins to control the flow pattern of each of said sections of the receptacle against the fins of said adjacent mold member.