CN115816800A - Blowing forming die - Google Patents

Abstract

The invention discloses a blow molding mold, which comprises an inner wall defining a container main body, an inner molding surface and an outer molding surface defining a bottom of the container, the outer molding surface includes a bottom connected in sequence and used to define part of the bottom surface of the container The molding surface, the foot forming position for defining the container foot and the bottom edge molding surface for defining the bottom edge; an annular groove is arranged between the inner molding surface and the outer molding surface, and the outer molding The radially distal end of the surface is provided with an exhaust groove, and the annular groove and/or the exhaust groove is provided with an exhaust structure that directly or indirectly communicates the cavity space to the outside. In the present invention, an annular groove, an exhaust groove, and a communication groove connecting the annular groove and the exhaust groove are arranged at the bottom of the blow molding mold, and the cavity space is directly or indirectly arranged in the annular groove and/or the exhaust groove. The exhaust structure connected to the outside can quickly discharge the air at the corresponding position of the bottom of the container, reducing the air resistance when the bottom of the container is expanded and formed, which is beneficial to the bottom of the container formed during low-pressure blowing.

Description

A blow molding mold

technical field

The invention relates to the technical field of bottle blowing molds, in particular to a blow molding mold.

Background technique

In the prior art, the container is blown from the container blank in the bottle blowing mold. The bottle blowing mold structure generally includes a left half mold, a right half mold matched with the left half mold, a bottom of the left half mold and a The bottom mold that matches the bottom of the right half mold forms a mold cavity between the left half mold, the right half mold and the bottom mold, and the container blank expands in the mold cavity until it fits the inner wall of the mold cavity to form a container. For the specific structure, please refer to the Chinese utility model patent document whose patent application number is 202122664676.9 and the patent name is a bottom mold cooling channel structure, bottom mold and bottle blowing mold.

Referring to Fig. 1, some existing containers include a container body 01, a container bottom surface 02, a container foot 03 arranged between the container body 01 and the container bottom surface 02, the middle part of the container bottom surface 02 is provided with a bottom depression, the The part where the container bottom surface 02 is connected to the container foot 03 serves as the bottom edge. If adopt existing mold cavity structure to carry out bottle blowing to this container preform, because the bottom foot molding position that limits foot in the mold cavity structure, the bottom molding surface that limits bottom surface, the bottom depression molding surface that limits bottom depression are all not set correspondingly. Therefore, it is necessary to use a higher blowing pressure to ensure that the various parts of the bottom of the container are fully formed, which consumes a lot of high-pressure gas. Once the blowing pressure drops, some parts of the bottom of the container will not be fully formed, affecting The quality of finished products is not conducive to enterprises to improve product quality, energy saving and emission reduction, and efficient production.

Contents of the invention

In order to overcome the deficiencies of the prior art, a blow molding mold is provided, which can quickly discharge the gas at the bottom of the mold cavity, so that the bottom of the container can be formed more easily.

The technical solution adopted by the present invention to solve its technical problems is:

A blow molding mold comprising an inner wall defining a container body, and an inner molding surface defining a bottom of the container and an outer molding surface, the outer molding surface comprising a bottom molding surface sequentially connected to define a portion of the bottom surface of the container, The foot forming position for defining the container foot and the bottom edge molding surface for defining the bottom edge; an annular groove is arranged between the inner molding surface and the outer molding surface, and the radial direction of the outer molding surface The far end is provided with an exhaust groove, and at least one communication groove is arranged between the annular groove and the exhaust groove, and the annular groove and/or the exhaust groove are provided with a valve that directly or indirectly communicates the cavity space to the outside world. exhaust structure.

In the present invention, the exhaust groove is located between the foot forming position and/or between the bottom molding surface and the foot forming position.

In the present invention, the exhaust structure includes a second exhaust hole arranged in the exhaust groove and connected to the outside.

In the present invention, a plurality of communicating grooves are provided and spaced around the periphery of the inner molding surface.

In the present invention, the inner molding surface includes a peripheral surface and protrusions and depressions located on the circumference, and at least part of the protrusions and/or depressions are in contact with the peripheral surface to provide air guide grooves. The air guiding groove is directly or indirectly connected to the exhaust structure through the air collecting groove.

In the present invention, the blow molding mold includes a mold cavity structure and a bottom mold, and the mold cavity structure includes two mold cavity half molds, and the mold cavity half mold has a half mold cavity and a half mold installation position; The mold includes a mold bottom, a bottom mold forming part arranged on the mold bottom, two half-model cavities and the bottom mold are configured to form a cavity, and the inner wall, the inner molding surface and the outer molding surface jointly define the cavity Forming surface.

In the present invention, the inner wall and the outer molding surface are located on the half mold cavity of the mold cavity half, and a semicircular hole is provided between the half mold installation position and the outer molding surface, and the semicircular hole has a hole wall. The inner molding surface is located on the molding part of the bottom mold, a peripheral surface is provided between the bottom of the mold and the inner molding surface, the exhaust structure includes a matching gap between the hole wall and the peripheral surface, and the annular groove is formed by The gap provides or said annular groove is provided around the edge of the outer molding surface and communicates with the mating gap.

In the present invention, the exhaust structure further includes a mold cavity exhaust groove on the hole wall, and the mold cavity exhaust groove extends from the annular groove to the half-mold installation position.

In the present invention, the inner wall is located in the mold cavity half, the inner molding surface and the outer molding surface are located in the forming part of the bottom mold, and a first vent hole communicating with the outside is provided in the annular groove.

In the present invention, the exhaust structure further includes a first exhaust hole arranged in the annular groove and connected to the outside.

The beneficial effect of the present invention is: the present invention is provided with annular groove, exhaust groove, the communication groove that communicates annular groove and exhaust groove at the bottom of blow molding mold, and is provided with in annular groove and/or exhaust groove The exhaust structure that directly or indirectly connects the cavity space to the outside can quickly discharge the air at the corresponding position at the bottom of the container, reducing the air resistance when the bottom of the container is inflated and forming, which is beneficial to the bottom of the container when blowing at low pressure, making the bottom of the container Molding is fuller.

Furthermore, the annular groove and the exhaust groove are connected through the connecting groove, and an exhaust path with staggered ring diameters is formed at the bottom of the cavity structure, which enhances the ability of rapid exhaust and achieves the effect of "no air resistance", which is more conducive to low-pressure blowing. The bottom of the container is formed when the bottle is bottled, and at the same time, the bottom of the container can be covered with a material with a smaller thickness, which is beneficial to the lightweight of the bottom of the container.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the present invention is further described:

Fig. 1 is the structural representation of container;

Fig. 2 is the structural representation of embodiment one;

Fig. 3 is an enlarged view of part A of Fig. 2;

Fig. 4 is the bottom mold structure schematic diagram of embodiment one;

Fig. 5 is the structural representation of embodiment two;

Fig. 6 is an enlarged view of part B of Fig. 5;

Fig. 7 is the structural representation of embodiment three;

Fig. 8 is the bottom mold structure schematic diagram of embodiment three;

FIG. 9 is an enlarged view of part C of FIG. 8 .

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "left", "right", "top/bottom" etc. Based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "installed", "set with", "sleeved/connected", "connected", etc. should be understood in a broad sense, such as " Connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be an internal connection between two components. connectivity. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

Embodiment one:

As shown in Figures 2 to 4, this embodiment discloses a blow molding mold, including a mold cavity structure 10 and a bottom mold 20, the mold cavity structure 10 includes two mold cavity half-moulds 11, the mold cavity Cavity half mold 11 has half mold cavity 12 and half mold installation position 13; Described bottom mold 20 comprises mold bottom 21, bottom mold molding part that is arranged on mold bottom 21, two half mold cavities 12 and bottom mold 20 are configured A cavity is formed, the cavity includes an inner wall 121 defining the container body 01, an inner molding surface 22 defining a bottom, and an outer molding surface 24, the inner wall 121, the outer molding surface 24 and the inner molding surface 22 jointly defining the The molding surfaces of the cavity and together define the shape of the container. The outer molding surface 24 includes a bottom molding surface 241 which is connected in sequence and is used to define part of the bottom surface 02 of the container, a foot forming position 242 for defining the container foot 03 and a bottom edge molding for defining the bottom edge. Surface 243 , the container bottom surface 02 is jointly defined by the bottom molding surface 241 and the inner molding surface 22 . In this embodiment, the bottom molding surface 241 is approximately parallel to the placement surface, and may also be a plane or a curved/arc surface inclined toward or away from the placement surface. The above-mentioned structure is basically the same as the patented technical solution of the applicant's earlier application, and will not be described in detail here. An annular groove 25 is provided between the inner molding surface 22 and the outer molding surface 24, and an exhaust groove 26 is arranged at the radially far end of the outer molding surface 24. Between the annular groove 25 and the exhaust groove 26 A plurality of communication grooves 27 are provided, and the plurality of communication grooves 27 surround the periphery of the inner molding surface 22 at intervals. The number of the communication grooves 27 is preferably 2, 3, 5, 7 or multiples of the above numbers, and the communication grooves 27 are preferably equiangularly distributed, that is, the angles between adjacent communication grooves 27 are equal. The annular groove 25 and/or the exhaust groove 26 is provided with an exhaust structure that directly or indirectly communicates the cavity space to the outside.

In this embodiment, the inner wall 121 and the outer molding surface 24 are located on the mold half cavity 12, and a semicircular hole 16 is provided between the mold half installation position 13 and the outer molding surface 24, and the semicircular hole 16 has a hole wall 161, the inner molding surface 22 is located on the molding part of the bottom mold, a peripheral surface 211 is provided between the mold bottom 21 and the inner molding surface 22, and the exhaust structure includes a space between the hole wall 161 and the peripheral surface 211 The matching gap 3 comes from the gap between the bottom mold 20 and the cavity structure 10, and the width of the matching gap is 0.2-0.7mm. In order to improve the exhaust efficiency of the fitting gap, an annular groove 25 is also provided. The annular groove 25 surrounds the edge of the outer molding surface 24. The annular groove 25 is a gap between the hole wall 161 and the bottom molding surface 241. The recessed depth of the notch is 0.5-1mm, and the width is 0.1-1.2mm. Try to avoid too deep recess and too wide width, so as to reduce the influence on the molding of the main body of the container. During implementation, the depth and width of the mold cavity exhaust groove 17 are the same as the width of the notch. Since the mold cavity exhaust groove 17 is located at the bottom of the annular groove 25, the width of the mold cavity exhaust groove 17 can be appropriately increased, preferably at the width of the gap. 6 times or less. At the same time, the hole wall 161 is provided with a plurality of mold cavity exhaust grooves 17 at intervals, and the mold cavity exhaust grooves 17 extend from the outer molding surface 24 to the half-mold installation position 13 and communicate with the annular groove 25 at the same time. An exhaust hole is formed between the mold cavity exhaust groove 17 and the peripheral surface 211, and the gas entering the annular groove 25 is discharged through the exhaust hole. The annular groove 25 is preferably located at the lowest point in the cavity, which can quickly discharge the air entering the bottom area of the cavity to achieve a better exhaust effect.

The mold cavity exhaust groove 17 and the annular groove 25 of this embodiment are all located on the side of the semicircular hole 16 , and the mold cavity exhaust groove 17 and the annular groove 25 can also be arranged on the peripheral surface 211 during implementation. During implementation, a gap is provided between the mold bottom 11 and the half-mold installation position 13, and the matching gap 3 and the mold cavity exhaust groove 17 are directly or indirectly connected with the outside world through the gap, and the matching gap 3 and the mold cavity exhaust groove 17 Exhausted gas is discharged through the gap. In this embodiment, the optimization of the exhaust function can be achieved by making small changes to the overall mold, which is convenient for upgrading the old mold and is conducive to popularization.

As a preferred embodiment, the inner molding surface 22 includes a peripheral surface 221 and a raised position and a recessed position located on the peripheral surface 221, the raised position and the recessed position are used to define the recessed position forming the bottom of the container, the The protruding positions include dome parts, reinforcing ribs, etc., and the recessed positions are not shown in the accompanying drawings. An air guide groove 23 is provided on part or all of the protruding position and/or the recessed position in contact with the peripheral surface 221, and the air guide groove 23 surrounds the outer periphery of the protruding position and/or the recessed position and communicates with the ring through the air collecting groove 231. Groove 25; the width of air guiding groove 23 is less than or equal to the width of air collecting groove 231, and the depth of air guiding groove 23 is identical with the depth of air collecting groove 231, and as preferred scheme, the width of air guiding groove 23 is the width of air collecting groove 231 0.25-0.75, or the area of the exhaust surface of the air guide groove 23 is 0.25-0.75 of the area of the exhaust surface of the air collection groove 231. The air discharge speed at the corresponding position of the bottom depression can be accelerated through the air guide groove 23, so that the bottom depression can be shaped more fully.

In this embodiment, the exhaust structure also includes a second exhaust hole 261 located in the exhaust groove 26 and connected to the outside world. The second exhaust hole 261 is provided in multiples and arranged at uniform intervals around the axis of the cavity. , the second vent hole 261 passes through the cavity structure 10 and directly or indirectly communicates with the outside world. The preferred position of the exhaust groove 26 is located between the bottom molding surface 241 and the foot forming position 242; in other embodiments, it can also be set on the foot forming position 242 and/or the bottom molding surface, both Reduce the gas pressure in the area, so that the gas in other areas quickly enters the area and then is discharged; when setting the direction of the second exhaust hole 261, it can be selected according to the position of the second exhaust hole 261 to be parallel to the axis of the cavity/ Vertical/at an angle. The air entering the bottom depression area can be quickly introduced into the annular groove 25 through the air guide groove 23, the air entering the container bottom surface 02 area can be quickly discharged through the annular groove 25, and the air corresponding to the container foot 03 can be quickly discharged through the exhaust groove 26, thereby The corresponding air at the bottom of the entire container bottle is quickly discharged, reducing the air resistance when the bottom of the container is expanded and formed, which is beneficial to the bottom of the container during low-pressure blowing, making the bottom of the container more full. In this embodiment, the recessed depth of the air collecting groove 231 and the exhaust groove 26 is 0.5-1mm, and the width is 0.5-1.5mm, and the diameter of the second exhaust hole 261 corresponds to the width of the exhaust groove 26 .

Embodiment two:

Referring to Fig. 5 to Fig. 6, the structure and principle of this embodiment are basically the same as that of Embodiment 1, the difference is that when the width of the fitting gap 3 between the bottom mold 20 and the cavity structure 10 is large, as 0.5-1.5mm, the top of the matching gap 3 forms the annular groove 25, and the hole wall 161 does not need to be provided with the mold cavity exhaust groove 17, which can meet the exhaust requirements.

Embodiment three:

Referring to Fig. 7 to Fig. 9, the structure and principle of this embodiment are basically the same as that of Embodiment 1, the difference is that: the container bottom surface 02 and the container foot 03 are all shaped by the relevant structures in the bottom mold 20 . In this embodiment, the inner wall 121 is located in the half-molding cavity 12, the inner molding surface 22 and the outer molding surface 24 are located in the forming part of the bottom mold, and the inner molding surface 22 and the outer molding surface 24 are provided The annular groove 25 is provided with an exhaust groove 26 at the radially far end of the outer molding surface 24, and a plurality of communication grooves 27 are arranged between the annular groove 25 and the exhaust groove 26. The second exhaust hole 261 inside and connected to the outside.

During implementation, the air guide groove 23 on the inner molding surface 22 will bring the gas in the raised position and/or the depressed position area into the annular groove 25 through the gas collection groove 231, and the gas entering the annular groove 25 will enter the exhaust gas through the communication groove 27. Gas groove 26; at the same time, the gas in the corresponding areas of the annular groove 25 and the exhaust groove 26 directly enters the annular groove 25 and the exhaust groove 26 respectively; finally, it is discharged to the outside through the second exhaust hole 261. Through this exhaust method, the gas in the middle of the inner molding surface 22 can be quickly discharged through guidance, avoiding the lack of container molding caused by poor exhaust in the middle area, and the need to increase the blowing air pressure; solve the problem of inner molding Surface 22 is quite different from other parts of the bottom surface of the container, the exhaust structure is complex, and the exhaust efficiency is low; since the bottom of the container is formed by the bottom mold, it is easier to design a cooling scheme that meets the cooling needs of the entire bottom of the container, avoiding the bottom The problem of uneven cooling.

During implementation, the exhaust structure may further include a first exhaust hole 251 arranged in the annular groove 25, the first exhaust hole 251 communicates with the outside world, and the first exhaust hole 251 is provided with a plurality of Evenly spaced around the cavity axis. The first vent hole 251 runs through the bottom mold 20 in parallel and inclined to the axial direction of the cavity and communicates with the outside world, or runs through the bottom mold 20 and communicates with the outside world in a multi-stage path at multiple angles, and enters the annular groove 25 The gas is discharged through the first exhaust hole 251. During manufacture, the bottom mold 20 can be processed by additive processing methods such as 3D printing, or processed by a combination of additive processing and subtractive processing.

In this embodiment, the width and depth of the annular groove 25 should not affect the molding of the container. The widths are corresponding, and the arrangement of the air guiding groove 23, the air collecting groove 231, the exhaust groove 26 and the second exhaust hole 261 refers to the first embodiment.

The above descriptions are only the preferred implementation modes of the present invention, as long as the technical solutions to achieve the purpose of the present invention by basically the same means fall within the scope of protection of the present invention.

Claims (10)

1. A blow molding mold, characterized in that: comprise the inner wall of the container main body and limit the inner molding surface and the outer molding surface of the bottom of the container, the outer molding surface includes successively connected and used to limit the bottom surface of a part of the container The bottom molding surface, the foot forming position for defining the container foot and the bottom edge molding surface for defining the bottom edge; an annular groove is arranged between the inner molding surface and the outer molding surface, and the outer The radial far end of the molding surface is provided with an exhaust groove, at least one communication groove is arranged between the annular groove and the exhaust groove, and the cavity space is directly or An exhaust structure that communicates indirectly to the outside world. 2 . The blow molding mold according to claim 1 , wherein the exhaust groove is located between the foot forming position and/or between the bottom molding surface and the foot forming position. 3 . 3 . The blow molding mold according to claim 1 , wherein the exhaust structure includes a second exhaust hole arranged in the exhaust groove and connected to the outside. 4 . 4. A blow molding mold according to claim 1, characterized in that: said communication grooves are provided in plurality and surround the periphery of the inner molding surface at intervals. 5. A blow molding mold according to claim 1, characterized in that: the inner molding surface includes a peripheral surface and a raised position and a recessed position located on the peripheral surface, at least part of the raised position and the recessed position /or an air guiding groove is provided at the contact part between the recessed position and the peripheral surface, and the air guiding groove is directly or indirectly connected to the exhaust structure through the air collecting groove. 6. A blow molding mold according to any one of claims 1-5, characterized in that: the blow molding mold comprises a cavity structure and a bottom mold, and the cavity structure comprises two cavity halves , the mold cavity half-mold has a half-model cavity and a half-mold installation position; the bottom mold includes a mold bottom, a bottom mold forming part arranged on the mold bottom, two half-model cavities and the bottom mold are configured to form a mold cavity, The inner wall, inner molding face and outer molding face collectively define a molding face of the cavity. 7. A blow-molding mold according to claim 6, characterized in that: said inner wall and outer molding surface are located on the half-model cavity of the mold cavity half-mold, between the half-mold installation position and the outer molding surface There is a semicircular hole between them, the semicircular hole has a hole wall, the inner molding surface is located on the molding part of the bottom mold, a peripheral surface is provided between the bottom of the mold and the inner molding surface, and the exhaust structure includes a hole The fitting gap between the wall and the peripheral surface, the annular groove is provided by the fitting gap or the annular groove is arranged around the edge of the outer molding surface and communicates with the fitting gap. 8. A blow molding mold according to claim 7, characterized in that: said exhaust structure further comprises a mold cavity exhaust groove on the hole wall, and the mold cavity exhaust groove extends from the annular groove to half Module installation position. 9. A blow molding mold according to claim 6, characterized in that: the inner wall is located in the half mold cavity, the inner molding surface and the outer molding surface are located in the molding part of the bottom mold, and the annular groove A first exhaust hole communicating with the outside is provided inside. 10 . The blow molding mold according to claim 9 , wherein the exhaust structure further comprises a first exhaust hole arranged in the annular groove and connected to the outside. 11 .

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