Modular direct blow molding system

Abstract

This modular direct blow molding system offers cost reductions, including initial costs, and shorter lead times, even in small-lot production, while also providing a simple and efficient structure. [Solution] This system forms a container by defining a design space corresponding to the outer shape of the container by clamping a mold, and by blowing high-pressure gas into the inside of the parison. The mold consists of a split nozzle, a split insert, a split burr cutter, and a base mold. When the mold is clamped, the design space is defined by a pair of split inserts, a pair of split burr cutters are aligned to cut burrs on the parison, and a nozzle that holds the nozzle is formed by a pair of split nozzles. Either the split nozzle, the split insert, or the split burr cutter is created by a 3D printer.

Description

Technical Field

[0001] The present invention relates to a modular direct blow molding system for producing containers such as cosmetics by direct blow molding.

Background Art

[0002] Generally, in a blow molding system, since it is premised on mass-producing a large number of containers, on the order of tens of thousands, using a single type of mold, it has a structure with a highly strong and durable metal mold.

[0003] However, in such a system, when producing a plurality of types of containers with different container shape designs in a small lot size of, for example, several thousand for promotional items, problems occur in terms of cost merit based on initial cost and lead time.

[0004] That is, according to the conventional blow molding system, when producing a plurality of types of containers with different container shape designs, it is necessary to prepare molds corresponding to each container shape for the number of designs. However, since processing such as metal cutting is required for the production of these molds, it is necessary to place an order with a specialized metal processing company and receive delivery, which increases the lead time for container production.

[0005] Also, when the lot size of container production using the same mold is large, as a result, the cost of newly produced molds is divided, and overall cost merit can be expected. On the other hand, when the lot size of container production using the same mold is small, there is a problem that the initial cost for newly produced molds relatively increases, and it is difficult to find cost merit.

[0006] That is, in the above-described conventional blow molding system, when producing a plurality of types of containers in a small lot size, due to the need to prepare a plurality of molds, it is difficult to find cost merit, and there is also a problem of increased lead time.

[0007] In contrast, as described in Patent Document 1, a modular blow molding system has been proposed that uses interchangeable 3D (three-dimensional) printed molds to accommodate both small-lot and large-lot production of containers, thereby achieving cost advantages based on initial costs. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Special Publication No. 2023-534428 [Overview of the project] [Problems that the invention aims to solve]

[0009] The modular blow molding system described above is a so-called biaxial stretch blow molding system, and moreover, it has a complex structure in which a space (volume section) for injecting and curing the filler is provided between the outer shell and the mold. For this reason, a large number of high-precision parts are required when constructing the system, which tends to increase manufacturing costs.

[0010] Furthermore, the filler is poured into the volume and allowed to harden to prevent deformation of the mold and to increase its strength. Therefore, this system is effective when using resin molds or thin metal molds that are prone to deformation when high-pressure air is injected, but when using metal molds of normal strength, the system has a functionally unnecessary and wasteful structure.

[0011] Furthermore, when changing molds, it is necessary not only to replace the molds but also to remove and reinject the filler. This work leads to a decrease in cost benefits.

[0012] This invention was made to solve the above-mentioned problems, and aims to provide a modular direct blow molding system that can reduce initial costs and shorten lead times even in small-lot production, and has a simple and efficient structure. [Means for solving the problem]

[0013] To solve the above problems, the first invention is a modular direct blow molding system that forms a container by clamping a pair of opposing molds together to define a design space corresponding to the outer shape of the container between the pair of molds, and by blowing high-pressure gas into the parison sandwiched in the design space, wherein each of the pair of molds is composed of a split nozzle, a split insert mold, a split burr cutter, and a base mold to which these are detachably assembled, wherein when the pair of molds are clamped together, the design space is defined by the pair of opposing split insert molds, the opposing pair of split burr cutters are in a state where their blades are aligned to cut burrs on the bottom of the parison, a nozzle for holding the nozzle for blowing in the high-pressure gas is formed by the opposing pair of split nozzles, and either the split insert mold, the split nozzle, or the split burr cutter is created by a 3D printer.

[0014] The second invention is a modular direct blow molding system according to the first invention, characterized in that any of the half-split insert mold, half-split die, or half-split burr cutter created by the 3D printer is made of either synthetic resin or metal.

[0015] The third invention is a modular direct blow molding system according to the first or second invention, characterized in that the base mold is made of metal and has recesses formed therein that allow the split die, the split insert mold, and the split cutting tool to fit tightly into the base mold.

[0016] The fourth invention is a modular direct blow molding system according to any one of the first to third inventions, characterized in that a cooling water passage for cooling the split insert mold is formed inside the split insert mold.

[0017] The fifth invention is a modular direct blow molding system relating to any one of the first to fourth inventions, characterized in that the cooling water passage is formed in a tubular or planar shape that bends, meanders, or curves to follow the design surface of the half-split insert mold.

[0018] The sixth invention is a modular direct blow molding system according to any one of the first to fifth inventions, characterized in that a connecting port communicating with the outside of the half-split insert mold is formed at each end of the cooling water passage.

[0019] The seventh invention relates to a modular direct blow molding system according to any one of the first to sixth inventions, characterized in that a first cooling water passage and a second cooling water passage are formed inside the base mold, one end of the first cooling water passage is connected to one of the connecting ports of the half-split insert mold, and the other end of the first cooling water passage has a supply port that communicates with the outside of the base mold, and one end of the second cooling water passage is connected to the other of the connecting port of the half-split insert mold, and the other end of the second cooling water passage has a discharge port that communicates with the outside of the base mold.

[0020] The eighth invention relates to a modular direct blow molding system according to any one of the first to seventh inventions, characterized in that the shape of the inner circumferential surface of the die is set such that when the nozzle is inserted into the parison, the corners of the nozzle press against the inner circumferential surface, sandwiching the parison. [Effects of the Invention]

[0021] According to the present invention, a pair of opposing molds are modularized, and only the members related to the molding of the container shape are created by an inexpensive and easily creatable 3D printer and made replaceable, so that cost reduction such as initial cost and lead time reduction can be achieved even in small-lot production, and a modular direct blow molding system having a simple and waste-free structure can be provided.

Brief Description of the Drawings

[0022] [Figure 1] It is a perspective view of a modular direct blow molding system according to an embodiment of the present invention. [Figure 2] It is an exploded perspective view of a mold applied to the modular direct blow molding system of FIG. 1. [Figure 3] It is a perspective view showing a base mold. [Figure 4] It is a perspective view of a half insert mold. [Figure 5] It is a perspective view of the half insert mold seen from the back side. [Figure 6] It is a front view of the half insert mold for explaining a cooling water passage. [Figure 7] It is a cross-sectional view of FIG. 6, (a) is a cross-sectional view taken along line A-A, (b) is a cross-sectional view taken along line B-B, (c) is a cross-sectional view taken along line C-C, (d) is a cross-sectional view taken along line D-D, and (e) is a cross-sectional view taken along line E-E. [Figure 8] It is a perspective view of the cooling water passage shown transparently. [Figure 9] It is a perspective view of a half burr cutter. [Figure 10] It is a cross-sectional view taken along line F-F of FIG. 9. [Figure 11] It is a perspective view showing a support structure of the half burr cutter. [Figure 12] It is a side view of the support structure of the half burr cutter. [Figure 13] It is a front view showing the upper part of the mold for explaining a half base. [Figure 14] It is a partial front view for explaining a burr cutting function. [Figure 15]These are schematic cross-sectional diagrams illustrating the container molding method. (a) shows the mold movement process, (b) shows the mold clamping process, burr cutting process, and parison cutting process, (c) shows the high-pressure air blowing process, cooling process, and burr cutting process, and (d) shows the demolding process and burr removal process. [Figure 16] This is a perspective view showing modified examples of a half-split nest type cooling water passage applied to the modular direct blow molding system of this embodiment, where (a) is a diagram showing the cooling water passage according to the first modified example, (b) is a diagram showing the cooling water passage according to the second modified example, and (c) is a diagram showing the cooling water passage according to the third modified example. [Modes for carrying out the invention]

[0023] The present invention is a modular direct blow molding system that forms a container by clamping a pair of opposing molds together to define a design space corresponding to the outer shape of the container between the pair of molds, and by blowing high-pressure gas into the parison sandwiched within the design space. The following describes an embodiment thereof with reference to the drawings.

[0024] (Example 1) Figure 1 is a perspective view of a modular direct blow molding system according to one embodiment of the present invention, and Figure 2 is an exploded perspective view of a mold applied to the modular direct blow molding system of Figure 1.

[0025] As shown in Figure 1, the modular direct blow molding system of this embodiment includes a pair of opposing molds 1-1 and 1-2.

[0026] Molds 1-1 and 1-2 are molds that serve as the main equipment for molding a container 110 of a desired design from parison 100 (hot parison), which is a resin that is heated, plasticized, and extruded by a direct blow method. As shown in Figure 2, each mold 1-1 (1-2) comprises a base mold 2 as a modular component, a split insert mold 3, a split burr cutter 4, and a split jaw 5. These split insert mold 3, split burr cutter 4, and split jaw 5 are detachably assembled to the base mold 2.

[0027] Figure 3 is a perspective view showing base type 2.

[0028] As shown in Figure 3, the base type 2 has two types of recesses 23 and 24 and a back plate 25. The recess 23 is composed of an upper recess 23a and a lower recess 23b that are continuous with each other vertically.

[0029] The upper recess 23a is a recess for housing and mounting the split insert 3. Its recess shape corresponds to the outer surface shape of the split insert 3, excluding the front surface (the surface on the front side in Figure 2), as shown in Figure 2, and it fits snugly with the split insert 3. On the back of the upper recess 23a, there are, for example, six holes 23c for passing screws 21a through, allowing the split insert 3 to be attached and fixed to the upper recess 23a using screws 21a.

[0030] Furthermore, the lower recess 23b is a recess for housing the burr cutting tool 4 shown in Figure 2. Its recessed shape is formed to correspond to the outer surface shape of the burr cutting tool 4, excluding the front and upper and lower surfaces, and it fits snugly with the burr cutting tool 4.

[0031] The recess 24 is a recess for fitting the split nozzle 5 shown in Figure 2. Its recess shape is formed to correspond to the outer surface shape of the split nozzle 5, excluding the front surface, and it fits snugly with the split nozzle 5. This recess 24 opens at the top and bottom and communicates with the lower upper recess 23a.

[0032] Furthermore, the side of the base type 2 is provided with a cooling water supply port 22a and a discharge port 22b, and holes 22c and 22d are provided on the back of the upper recess 23a, as shown by the dashed lines.

[0033] The supply port 22a is connected to the hole 22c through the cooling water passage 26 shown by the dashed line, and the discharge port 22b is connected to the hole 22d through the cooling water passage 27 shown by the dashed line.

[0034] Specifically, a first cooling water passage, a cooling water passage 26, and a second cooling water passage, a cooling water passage 27, are formed inside the base type 2. As will be described later, one end of the cooling water passage 26, a hole 22c, is connected to the connecting port 31 of the half-split nesting type 3, and the other end of the cooling water passage 26 has a supply port 22a that communicates with the outside of the base type 2. One end of the cooling water passage 27, a hole 22d, is connected to the connecting port 32 of the half-split nesting type 3, and the other end of the cooling water passage 27 has a discharge port 22b that communicates with the outside of the base type 2.

[0035] The back panel 25 is attached to the back of the base type 2 after all the screws 21a have been inserted through all the holes 23c.

[0036] Figure 4 is a perspective view of the half-split nesting type 3, and Figure 5 is a perspective view of the half-split nesting type 3 seen from the back.

[0037] The half-split nesting mold 3 is a mold for forming the design space V (see Figure 15(c)), which will be described later, corresponding to the outer shape of the container 110 (see Figure 1).

[0038] Specifically, as shown in Figure 4, the half-split insert mold 3 has a concave design surface S that corresponds to the half-outer shape of the container 110. As a result, when the half-split insert molds 3 of molds 1-1 and 1-2 come into contact with each other, the design surfaces S of these half-split insert molds 3 come together and, together with the half-split burr cutting tools 4, 4 described later, define a single design space V. For example, the design surface S of the half-split insert mold 3 of mold 1-1 and the design surface S of the half-split insert mold 3 of mold 1-2 are set to be symmetrical.

[0039] As shown by the dashed lines in Figure 4 and also in Figure 5, this half-split nesting type 3 is provided with six screw holes 33 corresponding to the holes 23c (see Figure 3) in the base type 2.

[0040] As a result, in Figure 2, the split insert 3 can be fitted tightly into the upper recess 23a of the base mold 2, and the screw 21a can be inserted through the hole 23c and fastened to the screw hole 33 of the split insert 3, thereby easily and securely assembling the split insert 3 to the base mold 2.

[0041] Furthermore, the half-split nesting type 3 is provided with connecting ports 31 and 32 for connecting to the cooling water holes 22c and 22d of the base type 2.

[0042] Figure 6 is a front view of the half-interlocked type 3 for illustrating the cooling water passage, Figure 7 is a cross-sectional view of Figure 6, where (a) is a cross-sectional view along line AA, (b) is a cross-sectional view along line BB, (c) is a cross-sectional view along line CC, (d) is a cross-sectional view along line DD, and (e) is a cross-sectional view along line EE, and Figure 8 is a perspective view of the cooling water passage 34 shown through transparency.

[0043] As shown in these figures, a cooling water passage 34 is formed inside the half-split nesting mold 3 to cool the half-split nesting mold 3 itself, and consequently to cool the heated parison 100 (see Figure 1).

[0044] Specifically, the cooling water passage 34 is connected to the outside of the half-split nested type 3 by having one end connected to the connecting port 31 and the other end connected to the connecting port 32.

[0045] In this embodiment, the cooling water passage 34 is formed in a meandering tubular shape that follows the design surface S of the half-split nesting mold 3, but it may also be formed in a tubular or planar shape that bends or curves to follow the design surface S of the half-split nesting mold 3.

[0046] As a result, when cooling water is supplied from the supply port 22a of the base type 2, the cooling water flows through the cooling water passage 26, indicated by the dashed line, to the hole 22c, and then flows into the cooling water passage 34 inside the half-split nesting type 3 through the connecting port 31 of the half-split nesting type 3 assembled to the base type 2. It then flows through the meandering cooling water passage 34 to the connecting port 32. After that, it flows into the cooling water passage 27, indicated by the dashed line, through the hole 22d of the base type 2, and is discharged from the outlet 22b.

[0047] The half-split nesting mold 3 with the structure described above is created using a known 3D (three-dimensional) printer. The material of the half-split nesting mold 3 created with the 3D printer can be either synthetic resin or metal, but in this embodiment, synthetic resin is used. The type of synthetic resin used is arbitrary, but acrylic resin is preferred. Furthermore, it is preferable to use a stereolithography 3D printer that cures liquid acrylic resin material by irradiating it with ultraviolet light.

[0048] Figure 9 is a perspective view of the half-split burr cutting tool 4, and Figure 10 is a cross-sectional view of Figure 9 along the FF line. In addition to the half-split burr cutting tool 4 shown in the cross-section, Figure 10 also shows the half-split burr cutting tool 4 shown by a dashed line, illustrating the aligned state of a pair of half-split burr cutting tools 4.

[0049] The half-split burr cutter 4 is a tool for cutting burrs on the bottom of the parison 100, and has a blade portion 40 with the cutting edge 40a facing forward on its front upper part.

[0050] As shown in Figure 10, the halving burr cutting tools 4,4 face each other when the molds 1-1,1-2 are clamped, and the cutting edges 40a,40a of the blade portions 40,40 are aligned so that they butt against each other. These halving burr cutting tools 4 are supported so that they can move up and down.

[0051] Figure 11 is a perspective view showing the support structure of the half-split burr cutting tool 4, and Figure 12 is a side view of the support structure of the half-split burr cutting tool 4.

[0052] As shown in Figure 11, the burr cutting tool 4 is supported so as to be able to move up and down by an air cylinder 41, a support 42, a position adjustment plate 43, and a pair of anti-float members 44, 44.

[0053] The air cylinder 41 is a device that can move the piston shaft 41a up and down using air pressure. Although the air cylinder 41 is a separate component from the base type 2, it moves together with the base type 2 in the same direction when the base type 2 is moved.

[0054] A block-shaped support 42 is connected to the piston shaft 41a, and the half-split burr cutter 4 is attached to the upper end of this support 42 via a position adjustment plate 43.

[0055] The position adjustment plate 43 is a plate that adjusts the blade alignment state of the half-split burr cutting tool 4 shown in Figure 10. By replacing the position adjustment plate 43 with one of a different thickness, the strength of the blade alignment state can be changed.

[0056] The pair of anti-float members 44, 44 are members that restrict the forward swinging of the half-split burr cutting tool 4 and are fastened and fixed to the base type 2.

[0057] For example, the anti-float members 44, 44 sandwich the burr cutter 4 from both sides and contact both sides of the burr cutter 4. The flange portion 44a protruding towards the burr cutter 4 contacts the front of the burr cutter 4 so as to support it, thereby restricting the movement of the burr cutter 4 toward the front.

[0058] As the burr cutting tool 4 is supported as described above, when the air cylinder 41 extends the piston shaft 41a and pushes up the support 42, as shown in Figure 12, the burr cutting tool 4 rises from the state shown by the solid line to the state shown by the dashed line.

[0059] Then, when the air cylinder 41 retracts the piston shaft 41a and lowers the support 42, the burr cutting tool 4 descends from the state shown by the dashed line to the state shown by the solid line.

[0060] At this time, the forward swinging of the burr cutting tool 4 is restricted by the pair of anti-float members 44, 44, so that the burr cutting tool 4 slides smoothly up and down within the lower recess 23b of the base type 2.

[0061] Figure 13 is a front view showing the upper part of mold 1-1 (1-2) to illustrate the split nozzle 5, and Figure 14 is a partial front view to illustrate the burr-cutting function.

[0062] The split nozzle 5 is a component that forms the nozzle for holding the nozzle 120, which will be described later, and is fitted tightly into the recess 24 of the base mold 2.

[0063] Each split nozzle 5 has a semicircular shape in plan view, and when the split nozzles 5, 5 of molds 1-1 and 1-2 are brought into contact with each other, they form a circular nozzle for holding the nozzle 120.

[0064] Furthermore, the inner circumferential surface 50 of the split nozzle 5 is formed in a convex shape, and its lowest surface 51 is set as a tapered surface that widens upward. As a result, as shown in Figure 14, when the nozzle 120 is inserted into the parison 100 held by the nozzle, the corner portion 121 of the nozzle 120 presses against the parison 100, allowing the excess upper end portion 102 of the parison 100 to be cut off on surface 51.

[0065] Next, a method for forming containers using the modular direct blow molding system of this embodiment will be described. Figure 15 is a schematic cross-sectional view illustrating the container molding method, where (a) shows the mold movement process, (b) shows the mold clamping process, burr cutting process, and parison cutting process, (c) shows the high-pressure air blowing process, cooling process, and burr cutting process, and (d) shows the demolding process and burr removal process.

[0066] As shown in Figure 15(a), first, the mold moving process is performed to position the cylindrical parison 100, which has been heated and plasticized by the extruder 130, between molds 1-1 and 1-2. At this time, the half-split burr cutting tools 4,4 are raised by air cylinders 41,41, so that the half-split burr cutting tools 4,4 are in contact with the lower surfaces of the half-split insert molds 3,3.

[0067] Then, as shown in Figure 15(b), the mold clamping process is performed. This causes the half-split burr cutting tools 4,4 to align their blades and clamp the lower end of the parison 100. The lower part of the parison 100 clamped by the half-split burr cutting tools 4,4 becomes a burr 101. Next, the burr cutting process is performed. That is, as shown by the solid line in Figure 15(b), when the half-split burr cutting tools 4,4 are lowered by the air cylinders 41,41, the burr 101 is cut by being bitten off by the half-split burr cutting tools 4,4, and the burr cutting process is performed. Almost simultaneously, the parison cutting process is performed, and the upper part of the parison 100 is cut by the cutter 131.

[0068] On the other hand, during the mold clamping process and before the burr cutting tools 4,4 are lowered, a high-pressure air blowing process is performed as shown in Figure 15(c), in which the nozzle 120 is pressed into the upper end of the parison 100 and high-pressure air A is blown into the parison 100. As a result, the hot parison 100 expands within the design space V defined by the design surfaces S,S of the half-split insert molds 3,3 and the burr cutting tools 4,4, and comes into contact with the entire design surface S,S.

[0069] At this time, the cooling water supplied from the supply port 22a of the base mold 2 flows through the cooling water passage 26, the hole 22c, and the connecting port 31 of the half-split insert mold 3 into the cooling water passage 34 inside the half-split insert mold 3, thus performing a cooling process (see Figures 3 and 6). As a result, the expanded parison 100 is cooled by the cooling water in the cooling water passage 34 and hardens into the desired container design shape.

[0070] Furthermore, as described above, when the nozzle 120 is press-fitted into the upper end of the parison 100, a burr-cutting process is performed, and as shown in Figure 14, the corner 121 of the nozzle 120 is pressed against the parison 100, and the burr 102 is cut off on the surface 51.

[0071] After this, as shown in Figure 15(d), a demolding step is performed to separate the molds 1-1 and 1-2 and return the nozzle 120, thereby allowing the molded container 110 to be removed. Additionally, a burr removal step is performed to discard the burrs 102 that have been separated from the upper end of the container 110.

[0072] According to the modular direct blow molding system of this embodiment, a large batch of containers 110 can be produced by repeating the above process.

[0073] Furthermore, when producing multiple types of small-lot containers 110, only the half-split nesting mold 3 needs to be replaced, allowing other elements to be reused. Moreover, since each half-split nesting mold 3 can be created quickly, simply, and at low cost using a 3D printer, it is possible to reduce initial costs and shorten lead times even when producing multiple types of small-lot containers.

[0074] Furthermore, since each half-insert mold 3 is created using a 3D printer, it is possible to easily create three-dimensional and complex cooling water passages 34 that could not be achieved with conventional metal cutting molds. In particular, when using synthetic resin with low thermal conductivity as the material for the half-insert mold 3, a 3D printer can easily form cooling water passages 34 with shapes and structures that compensate for the disadvantage of low thermal conductivity at desired locations within the half-insert mold 3.

[0075] Furthermore, in the modular direct blow molding system of this embodiment, each of the half-split insert mold 3, half-split burr cutter 4, and half-split die 5 that constitute each mold 1-1 (1-2) is configured to form approximately one block, and the structure of these half-split insert molds 3, etc., is simple. Since each mold 1-1 (1-2) can be assembled simply by housing the half-split insert mold 3 and half-split burr cutter 4 in the recess 23 of the base mold 2 and fixing them with screws, and fitting the half-split die 5 into the recess 24, these modules are easy to attach and detach, and as a result, the system is easy to build.

[0076] Furthermore, the split insert mold 3 and the split burr cutter 4 are fitted tightly into the recess 23 of the base mold 2, and the split nozzle 5 is fitted tightly into the recess 24. Therefore, there are no extra gaps between the split insert mold 3, the split burr cutter 4, the split nozzle 5 and the base mold 2, so there is no need to inject filler or anything to fill them. Also, deformation of the split insert mold 3 during blow molding is sufficiently suppressed by the base mold 2 itself, which functions as a housing to maintain strength.

[0077] (modified version) Figure 16 is a perspective view showing modified cooling water passages 34 of a split insert mold 3 applied to the modular direct blow molding system of this embodiment, where (a) shows the cooling water passage according to the first modified example, (b) shows the cooling water passage according to the second modified example, and (c) shows the cooling water passage according to the third modified example. Figures 16(a) and (b) show the cooling water passage as viewed from the rear side of the split insert mold 3, and Figure 16(c) shows the cooling water passage as viewed from the front side of the split insert mold 3.

[0078] As shown in Figure 16(a), the shape of the cooling water passage 34-1 according to the first modified example is substantially the same as that of the cooling water passage 34 applied to this embodiment. The passage length of the cooling water passage 34-1 is substantially the same as that of the cooling water passage 34, but the cross-sectional shape is different. That is, the cross-sectional shape of the cooling water passage 34 is circular, while the cross-sectional shape of the cooling water passage 34-1 is rectangular.

[0079] In this way, by setting the cross-sectional shape of the cooling water passage to a square, the entire cooling water passage can be positioned closer to the design surface S of the half-interlocked type 3. As a result, the cooling effect can be improved. For the same reason, the cross-sectional shape of the cooling water passage 34-1 may be set to a semi-circular shape. In this way, by setting the cooling water passage to a square or semi-circular shape, the cross-sectional area of ​​the waterway can be minimized.

[0080] As shown in Figure 16(b), the cooling water passage 34-2 in the second modified example is structured to supply cooling water from the connecting port 31 to a plurality of narrow cooling water passages 34a connected in parallel, and then discharge it from the connecting port 32.

[0081] By structuring the cooling water passage in this way, the cooling water channel can be made to follow the design surface S of the half-split nested type 3 even more closely. As a result, the cooling time can be shortened.

[0082] As shown in Figure 16(c), the cooling water passage 34-3 according to the third modified example is a passage that extends in a planar manner with approximately the same width as the design surface S of the half-split nested type 3. This cooling water passage 34-3 is in the shape of a thin tank, and is structured in such a way that almost the entire surface S of the design surface S of the half-split nested type 3 can be cooled by the cooling water filled inside the cooling water passage 34-3.

[0083] By structuring the cooling water passage in this way, the cooling water channel can be made to follow the design surface S of the half-split nested type 3 even more closely, and the cooling area can be made wider. As a result, the cooling time can be further shortened.

[0084] It should be noted that the present invention is not limited to the above embodiments, and various modifications and changes are possible within the scope of the gist of the invention.

[0085] For example, the above embodiment illustrates a split-type nesting mold 3 created by a 3D printer, but it is not limited to this. Of course, the split-type burr cutter 4 and the split-type jaw 5 can also be created by a 3D printer.

[0086] Furthermore, while the above embodiment illustrates a modular direct blow molding system in which the burr cutting tool 4 is made vertically movable by a support structure consisting of an air cylinder 41, a support body 42, a position adjustment plate 43, and a pair of anti-float members 44, 44, it goes without saying that a modular direct blow molding system in which the burr cutting tool 4 is fastened and fixed to the base mold 2 without such a support structure is also included in the scope of the present invention. [Explanation of symbols]

[0087] 1-1, 1-2 mold 2 Base type 3. Half-split nesting type 4. Half-split burr cutting tool 5. Half-split nozzle 21a, 21b Screws 22a Supply port 22b Outlet 22c,22d holes 23 Recess 23a Upper recess 23b Lower recess 23c,23d holes 24 recesses 25 Back plate 26 Cooling water passage (1st cooling water passage) 27 Cooling water passage (second cooling water passage) 31,32 Connection port 33 screw holes 34,34-1,34-2,34-3,34a Cooling water passage 40 Blade 40a cutting edge 41 Air Cylinder 41a Piston shaft 42 Support 43 Position adjustment plate 44 Anti-floating member 44a Flange portion 44a 50 Inner surface 51 sides 100 parisons 101,102 Bali 110 Container 120 nozzles 121 Corner 130 Extruder 131 Cutter A. High-pressure air S1, S2 Design surface V Design Space

Claims

1. A modular direct blow molding system that forms a container by clamping a pair of opposing molds together to define a design space corresponding to the outer shape of the container between the pair of molds, and by blowing high-pressure gas into the parison sandwiched within the design space, Each of the pair of molds is composed of a split die, a split insert, a split burr cutter, and a base mold to which these are detachably assembled. When the pair of molds are clamped, the design space is defined by the pair of opposing half-cut insert molds, the pair of opposing half-cut burr cutters are aligned to cut the burrs at the bottom of the parison, and the nozzle for holding the nozzle for blowing in the high-pressure gas is formed by the pair of opposing half-cut nozzles. The aforementioned split insert mold, the split nozzle, and the split burr cutter are to be manufactured using a 3D printer. A modular direct blow molding system characterized by the following features.

2. The modular direct blow molding system according to claim 1, characterized in that any of the split insert mold, split nozzle, or split burr cutter created by the 3D printer is made of either synthetic resin or metal.

3. The modular direct blow molding system according to claim 1 or 2, characterized in that the base mold is made of metal and has recesses formed therein that allow the split nozzle, the split insert mold, and the split cutting tool to fit tightly into the base mold.

4. The modular direct blow molding system according to claim 1 or 2, characterized in that a cooling water passage for cooling the split insert mold is formed inside the split insert mold.

5. The modular direct blow molding system according to claim 4, characterized in that the cooling water passage is formed in a tubular or planar shape that bends, meanders, or curves to follow the design surface of the half-split nested mold.

6. The modular direct blow molding system according to claim 4, characterized in that each end of the cooling water passage has a connecting port that communicates with the outside of the half-split insert mold.

7. The modular direct blow molding system according to claim 6, characterized in that a first cooling water passage and a second cooling water passage are formed inside the base mold, one end of the first cooling water passage is connected to one of the connecting ports of the half-split insert mold, and the other end of the first cooling water passage has a supply port that communicates with the outside of the base mold, and one end of the second cooling water passage is connected to the other of the connecting port of the half-split insert mold, and the other end of the second cooling water passage has a discharge port that communicates with the outside of the base mold.

8. The modular direct blow molding system according to claim 1 or 2, characterized in that the shape of the inner circumferential surface of the die is set such that when the nozzle is inserted into the parison, the corners of the nozzle press against the inner circumferential surface, sandwiching the parison.

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