JP2017057125A - Glass container molding die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glass container molding die capable of heightening strength of a glass bottle, by forming a constitution in which an excessive amount of glass on a neck part can be transferred to a trunk, especially to a reinforcement part of the trunk.SOLUTION: A glass container molding die for molding a glass container in which a trunk is linked to a neck part comprises a pair of split molds 2A, 2B capable of opening/closing a cavity part inside by mating each inside surface together. In body parts 25a, 25b of each split mold 2A, 2B, each hollow part 3a, 3b is formed respectively, which encloses from the outside, a region of the cavity part 20 corresponding to the neck part of the glass container to be molded.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a glass container molding die suitable for forming a glass container having a body portion connected to the neck portion, for example, a glass bottle such as a narrow mouth bottle or a light weight thin mouth bottle, and the present invention particularly relates to a body portion continuing to the neck portion. It is related with the metal mold for glass container suitable for shape | molding the glass container by which the contact point was set to the at least upper part position.

  A typical bottle making machine for producing glass bottles includes a rough mold apparatus and a finish mold apparatus in each of a plurality of sections. The molding process by the rough mold apparatus and the molding process by the finish mold apparatus are sequentially performed. Glass bottles are then molded in each section. As a method for producing a glass bottle, for example, a narrow neck press & blow method is known. In this method, a parison is formed from a lump of molten glass (hereinafter referred to as “gob”) charged in the rough mold of the rough mold apparatus, and then the parison is transferred into the finish mold of the finish mold apparatus. Air is blown into the parison to form a glass bottle.

  FIG. 8 shows a glass bottle forming procedure by a narrow neck press & blow method applied to the formation of a lightweight narrow mouth bottle (see, for example, Patent Document 1). First, when the gob G is received in the hollow portion 90 in the rough mold 9 (FIG. 8 (1)), the baffle 91 descends and closes the hollow portion 90, while the plunger 92 starts to rise, and the inside of the mouth mold 93 Passing through the hollow portion 90 of the rough mold 9. Thereby, the gob G is pressurized in the cavity 90 (FIG. 8 (2)). By this pressurization, the glass spreads in the cavity 90, and a parison P having a shape corresponding to the cavity 90 is formed (FIG. 8 (3)).

  The rough mold 9 is composed of a pair of split molds 9A and 9B. The hollow portion 90 is formed by combining the inner surfaces of the split molds 9A and 9B. When the parison P is molded in the hollow portion 90, the split molds 9A and 9B of the rough mold 9 are opened, and the parison P is vertically inverted by the invert device 95 while being supported by the mouth mold 93, and the finishing mold 96 (FIG. 8 (4)). The surface of the parison P that is in contact with the rough mold 9 is hardened. However, since the thickness inside the parison P is high, this temperature is transmitted to soften the hardened layer on the surface of the parison P (FIG. 8 (5)). )).

  When the blow head 97 is set in the finishing die 96, high-pressure air is blown into the parison P, and the glass bottle 8 is formed by the finishing die 96 and the bottom die 98 (FIG. 8 (6)). When the molding of the glass bottle 8 is completed, the blow head 97 is retracted and the finishing die 96 is opened. Then, the mouth of the glass bottle 8 is gripped by the take-out tongue 99 (FIG. 8 (7)) and is carried out in a suspended state. (FIG. 8 (8)).

  The light-weight narrow mouth bottle is a thick wall whose strength is reinforced in preparation for contact between the same glass bottles at least at an upper position (in the glass bottle 8 shown in FIG. 9, an upper position and a lower position) of the body portion 81. Each of the reinforced portions 82 and 83 is formed in a circle. These reinforcing portions 82 and 83 are generally called “contact points”. On the other hand, strength reinforcement is not made between the upper and lower reinforcing portions 82 and 83, and the non-reinforcing portion 84 is generally called a “recess surface”, and a label or the like is attached thereto. The reinforcing portions 82 and 83 slightly protrude from the non-reinforcing portion 84, and when the same glass bottles are adjacent to each other, the glass bottles are in contact with each other at the reinforcing portions 82 and 83 protruding outward. There is no risk of damage (see, for example, Patent Document 2).

Japanese Patent No. 5442019 JP 2014-190810 A

  However, when a lightweight narrow bottle is molded by the narrow neck press and blow method, the amount of glass distributed to the neck 80 becomes excessive than the amount of glass required by the neck, and excess glass stops at the neck 80. Therefore, it does not move to the body 81. For this reason, the amount of glass distributed to the body portion 81 becomes insufficient, and in particular, a sufficient amount of glass is not distributed to the reinforcing portion 82.83 of the body portion 81, so that a contact point with excellent strength is obtained. There was a problem that the strength of the glass bottle was reduced.

  This invention was made paying attention to said problem, and raises the intensity | strength of a glass bottle by setting it as the structure which can transfer the quantity of the excess glass of a neck part to a trunk | drum, especially the reinforcement part of a trunk | drum. An object of the present invention is to provide a glass container molding die that can be used.

  The mold for molding a glass container according to the present invention is for molding a glass container having a body part connected to a neck part, and a pair of openable and closable parts in which a cavity part is formed by matching the inner surfaces. It consists of a mold. A hollow portion is formed in the main body portion of each split mold so as to surround the region of the hollow portion corresponding to the neck portion of the glass container to be molded from the outside.

  In the above-described configuration of the present invention, the “split mold body” refers to a split solid portion (solid portion). In addition, “the area of the cavity corresponding to the neck of the glass container to be molded” refers to the area of the cavity related to the molding of the neck of the glass container. In terms of the rough mold, the parison that forms the neck of the glass container. It is a specific region of the cavity that molds the portion that hits the neck of the lip.

  When manufacturing a glass container such as a lightweight narrow mouth bottle using the glass container molding die according to the present invention, the hollow part formed in the main body part of each split mold has a hollow part region corresponding to the neck part of the glass container. Since it surrounds from the outside, the hollow portion functions as a heat insulating space, a temperature drop in the main body region inside the hollow portion is suppressed, and the temperature of the glass in contact with the inner main body region is kept high. Therefore, when the amount of the glass at the neck is excessive, the excessive glass is stretched by heat, and the glass moves to the body side. As a result, the amount of glass distributed to the body portion side is increased, and in particular, sufficient molten glass is supplied to the reinforcing portion of the body portion, so that a contact point having excellent strength can be obtained.

  In a preferred embodiment of the present invention, the hollow portion is constituted by a groove that opens along the open portion of the lower end surface at the lower end surface of the split mold, and the width of the groove is 0.1 mm or more, The depth of the groove is set to a depth that does not reach the region of the cavity corresponding to the contact point of the glass container to be molded.

  According to this embodiment, the temperature of the body portion region inside the hollow portion is suppressed by the heat insulating action of the air in the hollow portion, and when the excess glass in the neck portion is stretched by heat and moves to the trunk portion, the glass It is prevented from moving beyond the contact point of the container, and as a result, a contact point with excellent strength can be obtained with certainty.

  In a preferred embodiment of the present invention, the hollow portion is symmetrical with respect to the center line of the mold so that the angles formed by both ends with respect to the center of the mold and the inner surface of the split mold coincide with each other. It is formed in the shape of.

  According to this embodiment, as a result of the heat insulation action of the air in the hollow part, the main body part region inside the hollow part is kept warm evenly without being biased left and right, and as a result, variations in the thickness of the glass container to be formed can be suppressed.

  According to this invention, since the amount of excess glass at the neck can be transferred to the trunk, particularly the reinforcing portion of the trunk, a contact point with excellent strength is obtained, and the strength of the glass bottle is greatly improved.

It is sectional drawing which shows the structure of the rough type apparatus which has a rough type which is one Example of this invention, and the cavity part in a rough type. It is a bottom view of a rough mold in a state where split molds are combined. FIG. 3 is a sectional view taken along the center line z of the rough mold in FIG. 2. It is sectional drawing which shows a response | compatibility with the shape of the parison in a rough mold, and the shape of the glass bottle obtained from the parison. It is explanatory drawing which plotted and graphed the average value of the wall thickness about the glass bottle obtained from the parison shape | molded by the rough mold of FIG. 1 and the parison shape | molded by the conventional rough mold. . It is explanatory drawing which plotted and graphed the minimum value about the glass bottle obtained from the parison formed by the rough mold of FIG. 1 and the glass bottle from the parison formed by the conventional rough mold. It is explanatory drawing which shows the measurement location of the thickness of a glass bottle. It is explanatory drawing which shows the shaping | molding procedure of the glass bottle by the narrow neck press & blow system applied to shaping | molding of a lightweight narrow mouth bottle. It is the front view which fractured | ruptured a part which shows the glass bottle by which the contact point was set to the upper part position and lower part position of a trunk | drum.

  FIG. 1 shows a configuration of a rough mold apparatus 1 having a rough mold 2 according to an embodiment of the present invention and a structure of a hollow portion 20 in the rough mold 2. FIG. 2 is an external view of the rough mold 2 in a state where the split molds 2A and 2B are combined, as viewed from below. After the parison P shown in FIG. 4 is formed by the rough mold apparatus 1, a glass bottle having an outer shape indicated by a two-dot chain line in FIG. Is formed. The bottle 8 is, for example, a lightweight narrow mouth bottle, and reinforcing portions 82 and 83 called “contact points” are formed at an upper position and a lower position of the body portion 81 connected to the neck portion 80. In FIG. 4, X is a portion corresponding to the neck of the parison P that forms the neck portion 80 of the bottle 8 to be molded.

  The rough mold apparatus 1 includes a rough mold 2, a baffle 11 that closes a gob introduction port 23 that opens on the upper surface of the rough mold 2, a mouth mold 12 that communicates with a plunger inlet / outlet 24 that opens on the lower surface of the rough mold 2, and a mouth mold 12 and a plunger 13 that enters the rough mold 2 through the plunger inlet / outlet 24.

  The rough mold 2 has a hollow portion 20 for molding the parison P therein, and is composed of a pair of split molds 2A and 2B that can be opened and closed. Although FIG. 1 shows the configuration of one split mold 2A, the configuration of the other split mold 2B (not shown) is the same, and the reference numerals for the corresponding configurations are shown in parentheses. In FIG. 1, 20a and 20b are mold inner surfaces of the split molds 2A and 2B, and show the appearance of molding the gob G into a parison P having a predetermined side circumferential shape. 21a and 21b are inner surfaces (hereinafter referred to as “mating surfaces”) of the split molds 2A and 2B. When the split molds 2A and 2B are closed, the mating surfaces 21a and 21b are combined with each other. The cavity 20 is formed.

  Each split mold 2A, 2B has open portions 23a, 23b having a semicircular shape on the upper end surface and open portions 24a, 24b having a semicircular shape on the lower end surface. When the split molds 2A and 2B are closed and the mating surfaces 21a and 21b are combined, the open portions 23a and 23b of the upper end surfaces of the split molds 2A and 2B are combined to form the gob introduction port 23, and each split mold The opening portions 24a and 24b on the lower end surfaces of 2A and 2B are combined to form the plunger inlet / outlet port 24.

  As shown in FIGS. 2 and 3, hollow portions 3a and 3b are formed in the body portions 25a and 25b, which are solid portions of the split molds 2A and 2B. . The hollow portions 3a and 3b in the illustrated example are formed by bottomed grooves 30 that open along the open portions 24a and 24b on the lower end surfaces of the split molds 2A and 2B. The groove 30 constituting each of the hollow portions 3a and 3b forms a region X corresponding to the neck portion 80 of the bottle 8 to be formed, that is, the portion X corresponding to the neck of the parison P that forms the neck portion 80 of the bottle 8 to be formed. A specific region of the cavity 20 is surrounded from the outside. The width t of the groove 30 may be 0.1 mm or more, and the outer groove wall may reach a position that is half the diameter of the split molds 2A and 2B. In this embodiment, the width t of the groove 30 is 15 mm and is constant over the entire length of the groove 30. Further, in the bottle 8 to be molded, the contact point at the upper position is set to 32 mm from the upper end of the neck, whereas the depth h of the groove 30 is 16 mm and is constant over the entire length of the groove 30. Furthermore, the groove 30 of this embodiment is formed in a cylindrical shape in which the radii r1 and r2 of the inner and outer groove walls with respect to the center c of the rough mold 2 are constant over the entire depth, with r1 being 18 mm and r2 being 33 mm. However, the present invention is not limited to this, and may be formed in an inverted conical shape extending upward as shown by a one-dot chain line in FIG.

  Furthermore, the grooves 30 constituting the hollow portions 3a and 3b are split so that the angles θ1 and θ2 formed by both end portions 30L and 30R with respect to the center c of the rough mold 2 and the mating surfaces 21a and 21b coincide. It is formed in a symmetrical shape with respect to the center line z of the molds 2A and 2B. The angle range θ of the groove 30 with respect to the center c of the rough mold 2 is 80 to 120 degrees (100 degrees in this embodiment), and each of the angles θ1 and θ2 is 30 to 50 degrees (both 40 degrees in this embodiment). Set. The main body portions 25a and 25b of the split molds 2A and 2B are respectively provided with main body regions 26a and 26b inside the hollow portions 3a and 3b and main body regions 27a and 27b outside the hollow portions 3a and 3b by the hollow portions 3a and 3b. It is divided into. The inner main body regions 26a and 26b run along the outer periphery of the cavity 20 and are kept at a higher temperature than when there is no air layer due to the heat insulation action of the air in the hollows 3a and 3b. The inner main body region 26a, 26b and the outer main body region 27a, 27b are continuous in a range of angles θ1, θ2 between both end portions 30L, 30R of the groove 30 and the mating surfaces 21a, 21b. In addition, in order to improve the heat insulation of hollow part 3a, 3b, you may put a lid | cover and may pack a heat insulating material etc. with low heat conductivity.

  When the mating surfaces 21a and 21b of the split molds 2A and 2B are mated, a minute gap is generated between the mating surfaces 21a and 21b outside the butted portion along the cavity 20. The abutted portion is maintained at a high temperature by the heat insulating action of the air in the gap. Depending on the distance between the gap 30 and both ends 30L and 30R of the groove 30, that is, the magnitudes of the angles θ1 and θ2, there is a difference in the heat insulation state of the inner body regions 26a and 26b and the abutted portion.

  When the bottle 8 is manufactured using the rough mold apparatus 1 having the rough mold 2 having the above-described configuration and a finishing mold apparatus (not shown), the main body portions 25a and 25b of the split molds 2A and 2B of the rough mold 2 are formed. The hollow portions 3a and 3b that are curved in an arc shape surround a specific region of the hollow portion 20 that forms the portion X corresponding to the neck of the parison P that forms the neck portion 80 of the bottle 8 from the outside. Thereby, hollow part 3a, 3b functions as a heat insulation space, the temperature fall of main body part area | region 26a, 26b inside hollow part 3a, 3b is suppressed, and the temperature of the glass which touches said inner main body part area | region 26a, 26b Is kept at a high temperature. Therefore, when the parison P is moved to the finishing mold, if the amount of the glass at the neck portion 80 is excessive, the excessive glass is stretched and the glass moves toward the body portion 81 side. As a result, the amount of glass distributed to the body 81 side is increased, and in particular, sufficient molten glass is supplied to the reinforcing portions 82 and 83 of the body 81, so that a contact point with excellent strength can be obtained. The strength of the bottle 8 is increased.

  Further, the hollow portions 3a and 3b are constituted by grooves 30 opened along the open portions 24a and 24b at the lower end surfaces of the split molds 2A and 2B, respectively, and the width t and depth h of the grooves 30 extend over the entire length. Since it is constant, the main body regions 26a and 26b inside the hollow portions 3a and 3b are equally suppressed from temperature drop by the heat insulating action of the air in the hollow portions 3a and 3b, and the temperature is maintained in a uniform high temperature state. In the finishing mold, the surplus glass of the neck 80 extends and the glass moves to the body 81 side.

  Further, the hollow portions 3a and 3b are formed on the split molds 2A and 2B so that the angles θ1 and θ2 formed by the respective end portions 30L and 30R and the inner mating surfaces 21a and 21b of the split molds 2A and 2B coincide. Since it is formed in a symmetrical shape with respect to the center line z, the main body regions 26a, 26b inside the hollow portions 3a, 3b are evenly distributed right and left by the heat insulating action of the air in the hollow portions 3a, 3b. As a result, the variation in the thickness of the molded bottle 8 is suppressed.

  FIG. 5 shows a bottle 8 (hereinafter referred to as “appropriate bottle”) molded using a rough mold 2 (hereinafter referred to as “the main rough mold”) in which the hollow portions 3a and 3b are provided in the split molds 2A and 2B. The average of eight thickness measurement data d1 to d8 obtained by measuring the thickness at each angular position every 45 degrees as shown in FIG. 7 at each height position every 10 mm. A line graph D1 (AVE) in which values are plotted (indicated by ♦) and a rough shape in which the hollow portions 3a and 3b are not provided in each split shape (hereinafter referred to as “conventional rough shape”). 8 was obtained by measuring the wall thickness at each angular position (see FIG. 7) every 45 degrees at each height position every 10 mm. A broken line graphed by plotting (indicated by ●) the average value of eight thickness measurement data d1 to d8 It illustrates by comparing the rough D2 (AVE).

  FIG. 6 is a line graph D1 (MIN) plotted by plotting (shown by ◆) the minimum values of the eight wall thickness measurement data d1 to d8 obtained from the appropriate bottle, and the above comparison. This is a comparison with a line graph D2 (MIN) plotted by plotting (indicated by ●) the minimum values of the eight wall thickness measurement data d1 to d8 obtained from the bottle. 5 and 6, the vertical axis represents the bottle height (mm), and the horizontal axis represents the bottle thickness (mm).

  As shown in FIGS. 5 and 6, the appropriate bottle and the comparative bottle are 150 mm in height to the mouth, 30 mm in length at the neck, and the upper and lower positions of the body 81 connected to the neck 80. Contact points P1 and P2 are set at the positions. 5 and 6, the vertical dotted line T1 is the standard value for the thickness of the upper and lower contact points P1, P2, the dotted line T2 is the standard value for the neck and trunk thickness, and the dotted line T3 is the thickness at the bottom periphery. When the average value or the minimum value of the wall thickness is less than the standard values T1 to T3, the bottle becomes a defective bottle.

When comparing the average wall thickness (FIG. 5) of the thickness of the appropriate bottle formed using this rough mold with the thickness of the comparative bottle formed using the conventional rough mold, D1 (AVE)> It is D2 (AVE), the average value of the thickness of the appropriate bottle is larger than that of the comparative bottle, and the strength of the contact point P1 is increased. Further, the entire body portion 81 is generally D1 (AVE)> D2 (AVE), and the average value of the wall thickness of the appropriate bottle is generally larger than that of the comparative bottle. On the other hand, the neck 80 has D1 (AVE) <D2 (AVE), and the appropriate bottle has a smaller average thickness than the comparative bottle.
From the above, it can be inferred that the amount of excess glass in the neck portion 80 has moved to the body portion 81 in the proper bottle. Note that there is almost no difference in the average thickness of the appropriate bottle and the comparative bottle at the contact point P2 at the lower position and the lower portion of the body 81 near the bottom.

Next, when comparing the thickness of the appropriate bottle formed using this rough mold and the thickness of the comparative bottle formed using the conventional rough mold with respect to the minimum value (FIG. 6), the contact point P1 at the upper position is D1 ( MIN)> D2 (MIN), the appropriate bottle has a larger minimum wall thickness than the comparative bottle, and D1 (MIN)> D2 (MIN) at the contact point P2 at the lower position. The appropriate bottle has a larger minimum wall thickness. The body 81 is also generally D1 (MIN)> D2 (MIN), and the appropriate bottle has a larger minimum wall thickness as a whole than the comparative bottle.
From the above, the appropriate bottle has a larger minimum wall thickness overall than the comparative bottle, which means that there is room for the wall thickness with respect to the standard value. However, the frequency of appearance of defective products is reduced.

  In the above-described embodiment, the grooves 30 constituting the hollow portions 3a and 3b are formed in a symmetrical shape with respect to the center line z of the split molds 2A and 2B, and the grooves 30 with respect to the center c of the rough mold 2 are formed. The angle range θ is 100 degrees, and the angles θ1 and θ2 formed by the respective end portions 30L and 30R of the groove 30 with respect to the center c of the rough mold 2 and the mating surfaces 21a and 21b inside the split molds 2A and 2B are both 40 degrees. By setting the hollow portions 3a and 3b to the above-described configuration, an appropriate bottle having a preferable wall thickness as shown in FIGS. 5 and 6 can be obtained.

DESCRIPTION OF SYMBOLS 1 Rough type apparatus 2 Rough type 2A, 2B Split type 3a, 3b Hollow part 8 Bottle 20 Cavity part 23 Gob inlet 23a, 23b Open part 24 Plunger inlet / outlet 24a, 24b Open part 25a, 25b Main body part 30 Groove 80 Neck part 81 Body Part P1, P2 Contact point

Claims (3)

A mold for molding a glass container for molding a glass container having a body part connected to a neck part,
It is composed of a pair of openable and closable split molds in which a hollow part is formed inside by combining the inner surfaces, and the main body part of each split mold has an outside of the cavity part corresponding to the neck part of the glass container to be molded A mold for forming a glass container, in which a hollow portion that surrounds each is formed.   The hollow portion is configured by a groove that opens along the open portion of the lower end surface at the lower end surface of the split mold, the width of the groove is 0.1 mm or more, and the depth of the groove is the glass to be molded. The glass container molding die according to claim 1, wherein the mold is set to a depth that does not reach a region of the hollow portion corresponding to a contact point of the container.   The hollow portion is formed in a symmetrical shape with respect to a mold center line so that angles formed by both end portions with respect to the mold center and an inner surface of the split mold coincide with each other. 3. A mold for forming a glass container according to 1 or 2.

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