Blowing molding mechanism and mold apparatus

Abstract

This suppresses transfer defects caused by insufficient expansion of intermediate molded products during blow molding. [Solution] The blow molding mechanism 1 has a second mold 13 having a first region 131 that accommodates at least a portion of the bottomed cylindrical intermediate molded product 200 having an opening 205 on the side of the opening 205 from the boundary line L between the portion that will become the neck portion and the portion that will become the shoulder portion of the final molded product, and a second region 132 that accommodates the portion on the opposite side of the opening 205 from the boundary line L, and an air output unit 11 that inflates the intermediate molded product 200 by outputting air from an output port 112 at the tip of a long shaft tube 111 inserted into the intermediate molded product 200 from the opening 205, wherein the output port 112 is located on the side of the first region 131 from the boundary line L between the first region 131 and the second region 132.

Description

Technical Field

[0001] The present invention relates to a blowing mechanism and a mold device.

Background Art

[0002] Injection blow molding, which combines injection molding and blow molding, is known. In injection blow molding, first, in injection molding, a bottomed cylindrical intermediate molded product having an opening is molded. Next, in blow molding, high-pressure air is blown into the interior of the intermediate molded product to stretch it, and a bottle container or the like, which is the final molded product, is molded (for example, Patent Document 1). In blow molding, the intermediate molded product is inflated by outputting high-pressure air from the tip portion of a long-axis tube inserted into the interior of the intermediate molded product through the opening, and the shape of the mold is transferred.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, depending on the position of the tip portion of the long-axis tube inserted into the interior of the intermediate molded product for blow molding with respect to the mold, the air output from the tip portion may not sufficiently hit the intermediate molded product, resulting in insufficient inflation of the intermediate molded product and transfer defects in the mold. An object of the present invention is to suppress transfer defects associated with insufficient inflation of an intermediate molded product during blow molding.

Means for Solving the Problems

[0005] The present invention, completed with this objective in mind, is a blow molding mechanism comprising: a mold having a first region that accommodates at least a portion of the portion of a bottomed cylindrical intermediate molded product having an opening, on the opening side from the boundary between the portion that will become the neck portion and the portion that will become the shoulder portion of the final molded product; and a second region that accommodates the portion on the opposite side from the opening side from the boundary; and an air output unit that outputs air from the tip of a long-axis tube inserted into the intermediate molded product through the opening to inflate the intermediate molded product, wherein the tip of the long-axis tube is positioned on the first region side of the boundary. Here, the tip portion of the long-axis tube may be positioned further towards the opening than the first region. Furthermore, the second region may be characterized in that it allows expansion of the intermediate molded product, while the first region does not allow expansion of the intermediate molded product. Furthermore, the intermediate molded product may be a parison that is the target of blow molding to produce a bottle container with the opening as the mouth of the final molded product, and the portion of the intermediate molded product that expands in the second region may be molded into the shoulder, body, and bottom of the bottle container. Furthermore, the present invention, completed with this objective in mind, is a mold device comprising a blow molding mechanism, the blow molding mechanism having a mold having a first region that accommodates at least a portion of the bottomed cylindrical intermediate molded product having one opening, on the side of the boundary between the portion that will become the neck portion and the portion that will become the shoulder portion of the final molded product, and a second region that accommodates the portion on the opposite side of the boundary from the opening side, and an air output unit that outputs air from the tip of a long-axis tube inserted into the intermediate molded product through the opening to inflate the intermediate molded product, wherein the tip of the long-axis tube is positioned on the side of the boundary to the first region. [Effects of the Invention]

[0006] According to the present invention, transfer defects caused by insufficient expansion of the intermediate molded product during blow molding can be suppressed. [Brief explanation of the drawing]

[0007] [Figure 1] This is a cross-sectional view showing an example of the configuration of the blow molding mechanism according to this embodiment. [Figure 2] This is a cross-sectional view showing an example of the configuration of the blow molding mechanism according to this embodiment. [Figure 3] This is a cross-sectional view showing an example of the configuration of a conventional blow molding mechanism. [Figure 4] This is a cross-sectional view showing an example of the configuration of a conventional blow molding mechanism. [Modes for carrying out the invention]

[0008] Embodiments of the present invention will be described in detail below with reference to the attached drawings. <Configuration of the blow molding mechanism 1> Figures 1 and 2 are cross-sectional views showing an example of the configuration of the blow molding mechanism 1 according to this embodiment. Figures 1 and 2 show cross-sectional views of the blow molding mechanism 1 as seen from the top to the bottom in the vertical direction. Therefore, the front of Figure 1 is the top in the vertical direction, and the back of Figure 1 is the bottom in the vertical direction. Furthermore, Figure 1 shows the blow molding mechanism 1 when blow molding is performed, and Figure 2 shows the blow molding mechanism 1 immediately after blow molding has been performed.

[0009] The blow molding mechanism 1 shown in Figures 1 and 2 is a mechanism applied to a mold device that molds a final molded product 300 from an intermediate molded product 200 by injection blow molding, which combines injection molding and blow molding. The final molded product 300 is, for example, a bottle container such as a PET bottle. The mold device to which the blow molding mechanism 1 is applied includes a fixed mold, a movable mold, and an intermediate mold positioned between the fixed mold and the movable mold. The fixed mold, the movable mold, and the intermediate mold are each combinations of a mold that performs molding and various devices that operate in conjunction with the mold.

[0010] In injection blow molding, a bottomed cylindrical intermediate molded product 200 having an opening 205 is formed by injection molding with the fixed mold and the intermediate mold closed. In injection blow molding, the final molded product 300 is formed by blow molding onto the intermediate molded product 200 with the movable mold and the intermediate mold closed. In injection blow molding, the intermediate mold alternately performs injection molding and blow molding while moving between a position facing the fixed mold and a position facing the movable mold.

[0011] The blow molding mechanism 1 includes an air output unit 11 that outputs air inside the intermediate molded product 200 during blow molding, and a first split mold 12, a second split mold 13, a first bottom mold 14, and a second bottom mold 15 that function as molds during blow molding. Of the blow molding mechanism 1, the air output unit 11 and the first split mold 12 constitute part of the intermediate mold, and the second split mold 13, the first bottom mold 14, and the second bottom mold 15 constitute part of the movable mold.

[0012] Hereinafter, in a mold apparatus to which the blow molding mechanism 1 is applied, the direction in which the fixed mold and the intermediate mold open and close as a whole, and the direction in which the movable mold and the intermediate mold open and close as a whole (the axial direction of the intermediate molded product 200 during blow molding) will be referred to as the "opening and closing direction". Furthermore, the side of the opening 205 of the intermediate molded product 200 in the opening and closing direction will be referred to as the "first side", and the side of the bottom 204 of the intermediate molded product 200 in the opening and closing direction will be referred to as the "second side". In addition, the direction perpendicular to the axial direction (opening and closing direction) of the intermediate molded product 200 during blow molding will be referred to as the "radial direction". Furthermore, the side of the central axis (dotted line) in the radial direction of the intermediate molded product 200 will be referred to as the "inside", and the opposite side will be referred to as the "outside".

[0013] The air output unit 11 includes a hollow, elongated tube 111 that outputs high-pressure air from an output port 112 at its tip. The air output unit 11 inflates the intermediate molded product 200 by outputting high-pressure air from the output port 112 of the elongated tube 111, which is inserted into the intermediate molded product 200 through an opening 205. Before the high-pressure air is output from the output port 112, an extension rod (not shown) for stretching the intermediate molded product 200 protrudes from the output port 112 to the second side in the opening / closing direction, and extends inside the intermediate molded product 200 to stretch the intermediate molded product 200 to the second side in the opening / closing direction.

[0014] Figure 1 shows the intermediate molded product 200 when high-pressure air is output from the output port 112. Figure 2 shows the final molded product 300 formed when the intermediate molded product 200 in Figure 1 expands due to the output of high-pressure air from the output port 112.

[0015] Here, we will describe each part of the intermediate molded product 200 and the final molded product 300. As shown in Figure 1, the intermediate molded product 200 has a fringe portion 201 which is the outermost protruding part in the radial direction, and a mouth portion 202 which is the first part in the opening and closing direction from the fringe portion 201. The intermediate molded product 200 also has a body portion 203 and a bottom portion 204 which are the second parts in the opening and closing direction from the fringe portion 201.

[0016] Furthermore, as shown in Figure 2, the final molded product 300 has a fringe portion 201, a mouth portion 202, and a main body portion 303 and a bottom portion 304, which are the second portions in the opening and closing direction from the fringe portion 201. The main body portion 303 is the portion of the main body portion 203 of the intermediate molded product 200 that has been blow-molded. The main body portion 303 includes a neck portion 331, a shoulder portion 332, and a torso portion 333. Of these, the shoulder portion 332 is the portion of the intermediate molded product 200 that will become the shoulder portion 332 of the final molded product 300, portion 213 (the portion enclosed by the dashed line in Figure 1), that has been blow-molded. The bottom portion 304 is the portion of the bottom portion 204 of the intermediate molded product 200 that has been blow-molded.

[0017] The first split mold 12, also called a split and mouth split mold, is a separable split mold that grips the mouth part 202 of the intermediate molded product 200 and the final molded product 300 in the mold-closed state. FIGS. 1 and 2 show the first split mold 12 in the mold-closed state. When the final molded product 300 is molded by blow molding, the first split mold 12 opens from the inner side to the outer side in the radial direction with respect to the final molded product 300. As a result, the mouth part 202 of the final molded product 300 is released from the first split mold 12.

[0018] The second split mold 13, also called a blow split mold, is a separable split mold that functions as one of the molds for blow molding and forms the main body part 303 of the final molded product 300 from the main body part 203 of the intermediate molded product 200 in the mold-closed state during blow molding. FIG. 1 shows the second split mold 13 in the mold-closed state. When the final molded product 300 is completed by blow molding, the second split mold 13 opens from the inner side to the outer side in the radial direction with respect to the final molded product 300. As a result, the main body part 303 of the final molded product 300 and the fringe part 201 are released from the second split mold 13.

[0019] The first bottom mold 14 and the second bottom mold 15 function as one of the molds for blow molding and form the bottom part 304 of the final molded product 300 from the bottom part 204 of the intermediate molded product 200 during blow molding. Among these, the second bottom mold 15 also functions as part of an ejector mechanism that separates the final molded product 300 from itself and the first bottom mold 14 by protruding from the second side to the first side in the opening and closing direction after blow molding.

[0020] <Position of the output port 112> The blow molding mechanism 1 according to the present embodiment is characterized by the position in the opening and closing direction of the output port 112 of the long axis tube 111 of the air output part 11 that outputs high-pressure air during blow molding. Hereinafter, the characteristics of the position in the opening and closing direction of the output port 112 with respect to the second split mold 13 and its effects will be described while further referring to FIGS. 3 and 4, which are examples of the configuration of a conventional blow molding mechanism.

[0021] FIGS. 3 and 4 are cross-sectional views showing an example of the configuration of a conventional blow molding mechanism. Figures 3 and 4 show cross-sectional views of a conventional blow molding mechanism, viewed from the top to the bottom in the vertical direction. Therefore, the front of Figure 3 is the top in the vertical direction, and the back of Figure 3 is the bottom in the vertical direction. Furthermore, Figure 3 shows the conventional blow molding mechanism during blow molding, and Figure 4 shows the conventional blow molding mechanism immediately after blow molding has been performed.

[0022] The configuration of the conventional blow molding mechanism shown in Figures 3 and 4 is basically the same as the configuration of the blow molding mechanism 1 according to this embodiment shown in Figures 1 and 2 above. However, the position of the output port of the long axis pipe of the air output section of the conventional blow molding mechanism in the opening and closing direction is different from the position of the output port 112 of the long axis pipe 111 of the air output section 11 of the blow molding mechanism 1 according to this embodiment in the opening and closing direction. Specifically, the position of the output port of the long axis pipe relative to the second mold of the conventional blow molding mechanism is different from the position of the output port 112 of the long axis pipe 111 relative to the second mold 13 of the blow molding mechanism 1 according to this embodiment in the opening and closing direction.

[0023] As shown in Figures 1 and 2, the second mold 13 according to this embodiment has a first region 131 that does not allow expansion of the intermediate molded product 200 when high-pressure air for blow molding the intermediate molded product 200 is output from the output port 112, and a second region 132 that allows expansion. Conventional second molds also have a first region and a second region (see Figures 3 and 4).

[0024] In this embodiment, the long-axis pipe 111 of the air output section 11 is configured such that the output port 112 is positioned on the side of the first region 131 (the first side in the opening / closing direction) relative to the imaginary boundary line L between the first region 131 and the second region 132. Specifically, the output port 112 is positioned on the first side in the opening / closing direction relative to the boundary line L, and near the second side in the opening / closing direction relative to the end 133 on the first side in the opening / closing direction of the second mold 13. In contrast, the long-axis pipe of the air output section of a conventional blow molding mechanism is configured such that the output port is positioned on the side of the second region (the second side in the opening / closing direction) relative to the boundary line L between the first region and the second region.

[0025] These differences in configuration result in differences in the accuracy of the transfer of the mold shape, particularly in areas prone to transfer defects, such as the shoulder portion 332 of the final molded product 300 shown in Figure 2. The shoulder portion 332 of the final molded product 300 is the portion of the main body portion 303 of the final molded product 300 that is transferred with the shape of the second side in the opening and closing direction relative to the boundary line L, that is, the portion where the diameter of the cavity inside the second split mold 13 changes in the opening and closing direction.

[0026] In conventional blow molding mechanisms, as shown in Figure 3, high-pressure air output from the output port of the long-axis pipe of the air output unit flows in the direction of the arrow, inflating the intermediate molded product. This results in the formation of the final molded product as shown in Figure 4. However, in conventional blow molding mechanisms, the output port of the long-axis pipe of the air output unit is located on the second region side (the second side in the opening / closing direction) of the boundary line L, so the portion of the intermediate molded product that will become the shoulder of the final molded product (the portion enclosed by the dashed line in Figure 3) does not receive sufficient airflow.

[0027] In other words, the portion of the intermediate molded product that will become the shoulder of the final molded product, which is blow-molded using a conventional blow-molding mechanism, is positioned upstream of the output port with respect to the direction of airflow inside the long-axis tube. Therefore, the high-pressure air output from the output port flows in the opposite direction to the direction of airflow inside the long-axis tube in order to hit the portion of the intermediate molded product that will become the shoulder of the final molded product. In this case, the air pressure hitting the portion of the intermediate molded product that will become the shoulder of the final molded product is lower than the air pressure hitting the portion of the intermediate molded product that is positioned on the second side in the opening / closing direction relative to the output port. As a result, the portion of the intermediate molded product that will become the shoulder of the final molded product is less likely to expand, making transfer defects more likely.

[0028] In contrast, in the blow molding mechanism 1 according to this embodiment, as described above, the output port 112 of the long-axis pipe 111 of the air output unit 11 is positioned on the first region 131 side (the first side in the opening and closing direction) of the boundary line L. Therefore, air is more likely to come into contact with the portion 213 of the intermediate molded product 200 that will become the shoulder portion 332 of the final molded product 300.

[0029] In other words, the portion 213 of the intermediate molded product 200 that will become the shoulder portion 332 of the final molded product 300, which is blow-molded by the blow-molding mechanism 1 according to this embodiment, is positioned downstream of the output port 112 with respect to the direction of airflow inside the long-axis pipe 111. Therefore, the high-pressure air output from the output port 112 flows along the direction of airflow inside the long-axis pipe 111 (from the first side to the second side in the opening and closing direction) so as to hit the portion 213 of the intermediate molded product 200 that will become the shoulder portion 332 of the final molded product 300. In this case, unlike conventional blow-molding mechanisms, the air pressure hitting the portion 213 of the intermediate molded product 200 that will become the shoulder portion 332 of the final molded product 300 is less likely to decrease. As a result, the portion 213 is more likely to expand, and transfer defects are suppressed.

[0030] <Example 1> In the examples shown in Figures 1 and 2 above, the output port 112 of the long-axis pipe 111 of the air output section 11 is located on the first side in the opening / closing direction relative to the boundary line L, and near the second side in the opening / closing direction relative to the first side end 133 of the second split mold 13 in the opening / closing direction, but is not limited to this. The output port 112 of the long-axis pipe 111 of the air output section 11 only needs to be located on the first side in the opening / closing direction relative to the boundary line L.

[0031] Therefore, the output port 112 may be located on the first side in the opening / closing direction from the boundary line L, and on the second side in the opening / closing direction from the position of the output port 112 shown in Figures 1 and 2. In this case as well, the high-pressure air output from the output port 112 flows along the direction of air flow inside the long-axis pipe 111 and is more likely to hit the portion 213, causing the portion 213 to expand more easily and suppressing transfer defects.

[0032] <Modification 2> Furthermore, since it is sufficient to output air with the long shaft tube 111 inserted inside the intermediate molded product 200, for example, the output port 112 may be positioned further to the first side in the opening / closing direction than the first region 131 of the second mold 13. That is, the long shaft tube 111 may be configured such that the output port 112 is positioned further to the first side in the opening / closing direction than the first end 133 of the second mold 13 in the opening / closing direction. In this case as well, the high-pressure air output from the output port 112 flows along the direction of air flow inside the long shaft tube 111 and is more likely to hit the portion 213, so that the portion 213 is more likely to expand and transfer defects are suppressed.

[0033] <Variation 3> Furthermore, in the above example, the first region 131 is a region that does not allow expansion of the intermediate molded product 200, but is not limited to this, and may be a region that allows expansion of the intermediate molded product 200. Specifically, the first region 131 may be a region that allows expansion of the portion of the intermediate molded product 200 that will become the neck portion 331 of the final molded product 300 and the portion that will become part of the second side in the opening and closing direction of the fringe portion 201 when high-pressure air is output from the output port 112, and molds these portions.

[0034] In summary, the blow molding mechanism to which the present invention is applied only needs to have the following configuration, and various embodiments can be adopted. In other words, the blow molding mechanism 1 according to this embodiment is a mold having a first region 131 that accommodates at least a portion of the part of a bottomed cylindrical intermediate molded product 200 having an opening 205 that is on the opening 205 side (first side in the opening / closing direction) from a virtual boundary line L that indicates the boundary between the part that will become the neck portion 331 and the part that will become the shoulder portion 332 of the final molded product 300, and a second region 132 that accommodates the part on the opposite side from the opening 205 side (second side in the opening / closing direction) from the boundary line L. The blow molding mechanism comprises a second split mold 13, a first bottom mold 14, and a second bottom mold 15, and an air output unit 11 that outputs air from an output port 112 at the tip of a long shaft tube 111 inserted into the intermediate molded product 200 from an opening 205 to inflate the intermediate molded product 200, characterized in that the output port 112 at the tip of the long shaft tube 111 is positioned on the first region 131 side of a virtual boundary line L indicating the boundary between the first region 131 and the second region 132.

[0035] As a result, the output port 112, which outputs air inside the intermediate molded product 200 to expand it, is positioned upstream in the airflow direction (from the first side to the second side in the opening and closing direction) from the area where mold shape transfer defects are likely to occur. Consequently, air is more likely to come into contact with the area where transfer defects are likely to occur, causing that area to expand more easily and suppressing transfer defects.

[0036] Here, the output port 112 at the tip of the long shaft pipe 111 may be positioned further toward the opening 205 side of the intermediate molded product 200 (the first side in the opening / closing direction) than the first region 131. As a result, the output port 112, which outputs air inside the intermediate molded product 200 to inflate it, is positioned further upstream in the airflow direction (from the first side to the second side in the opening / closing direction) than the area where mold shape transfer defects are likely to occur. In this case, the length of the long shaft tube 111 in the opening / closing direction becomes shorter. As a result, the production of the long shaft tube 111 can be made more efficient while maintaining a state where air can easily hit the area where transfer defects are likely to occur, thereby suppressing transfer defects.

[0037] Furthermore, the second region 132 may be characterized by allowing expansion of the intermediate molded product 200, while the first region 131 may not allow expansion of the intermediate molded product 200. This allows the position of the output port 112, which outputs air to inflate the intermediate molded product 200, to be brought closer to the second region 132 without considering the first region 131, which does not need to be exposed to air. As a result, air is more likely to come into contact with areas prone to transfer defects, causing those areas to expand more easily and suppressing transfer defects.

[0038] Furthermore, the intermediate molded product 200 is a parison that is the target of blow molding to produce a bottle container with an opening 205 that forms the mouth portion 202, and the portion of the intermediate molded product 200 that expands in the second region 132 of the second split mold 13 is formed into the shoulder portion 332, body portion 333, and bottom portion 304 of the bottle container which is the final molded product 300. As a result, the output port 112 of the air output unit 11, which inflates the parison by outputting air inside the intermediate molded product 200, is positioned upstream in the airflow direction from the second region 132 of the second mold 13 that allows the parison to expand. Consequently, air is more likely to come into contact with the part of the intermediate molded product 200 that is molded into the shoulder portion 332 of the bottle container, which is prone to mold shape transfer defects. This makes that part more likely to expand, thus suppressing transfer defects.

[0039] Furthermore, the mold apparatus to which the present invention is applied only needs to have the following configuration, and various embodiments can be adopted. In other words, the mold apparatus according to this embodiment includes a blow molding mechanism 1, the blow molding mechanism 1 comprising a first region 131 that accommodates at least a portion of the portion of the bottomed cylindrical intermediate molded product 200 having an opening 205 that is on the opening 205 side (first side in the opening / closing direction) from a virtual boundary line L that indicates the boundary between the portion that will become the neck portion 331 and the portion that will become the shoulder portion 332 of the final molded product 300, and a second region 13 that accommodates the portion on the opposite side from the opening 205 side (second side in the opening / closing direction) from the boundary line L The mold apparatus comprises a second split mold 13, a first bottom mold 14, and a second bottom mold 15, which are molds having 2, and an air output unit 11 that inflates the intermediate molded product 200 by outputting air from an output port 112 at the tip of a long shaft tube 111 inserted into the intermediate molded product 200 from an opening 205, wherein the output port 112 at the tip of the long shaft tube 111 is positioned on the first region 131 side of a virtual boundary line L indicating the boundary between the first region 131 and the second region 132.

[0040] <Other> Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above. Furthermore, the effects of the present invention are not limited to those described in the embodiments described above. For example, the air output unit 11, the first split mold 12, the second split mold 13, the first bottom mold 14, and the second bottom mold 15 that constitute the blow molding mechanism 1 shown in Figures 1 and 2 are merely examples for achieving the objectives of the present invention and are not particularly limited.

[0041] Furthermore, although the final molded product is a bottle container in the above-described embodiment, the final molded product does not have to be a bottle container. It can be anything that can be molded by injection blow molding.

[0042] Furthermore, the final molded product does not necessarily have to be a product molded by injection blow molding. It is sufficient for the molding of the intermediate molded product and the molding of the final molded product to be carried out using different molds. For example, the final molded product may be a product molded by so-called two-color molding, in which different resins or materials are combined and integrated. Alternatively, for example, the final molded product may be a product molded by so-called insert molding, in which metal inserts such as screws or terminals are placed in a mold beforehand, and molten resin is injected around them to form a single integrated product.

[0043] Furthermore, the injection blow molding described above may be performed using the hot parison method, in which the intermediate molded product is blow-molded while maintaining the preheating from injection molding. Alternatively, it may be performed using the cold parison method, in which the intermediate molded product is cooled once, then reheated, and blow-molded. [Explanation of Symbols]

[0044] 1... Blow molding mechanism, 11... Air output section, 12... First split mold, 13... Second split mold, 14... First bottom mold, 15... Second bottom mold, 200... Intermediate molded product, 112... Output port, 111... Long axis tube, 131... First region, 132... No. 2 areas, 133...end, 205...opening, 300...final molded product, 201...fringe, 202,302...mouth, 203,303...body, 204,304...bottom, 331...neck, 332...shoulder, 333...body

Claims

1. A mold having a first region that accommodates at least a portion of the part of a bottomed cylindrical intermediate molded product having an opening, on the side of the opening from the boundary between the part that will become the neck and the part that will become the shoulder of the final molded product, and a second region that accommodates the part on the opposite side of the opening from the boundary, An air output unit that outputs air from the tip of a long-axis tube inserted into the intermediate molded product through the aforementioned opening to inflate the intermediate molded product, It has, The tip portion of the long-axis pipe is positioned on the side of the first region that is closer to the boundary, Blow molding mechanism.

2. The tip portion of the long-axis tube is positioned further towards the opening than the first region, characterized in that The blow molding mechanism according to claim 1.

3. The second region allows expansion of the intermediate molded product, and the first region does not allow expansion of the intermediate molded product. The blow molding mechanism according to claim 1.

4. The intermediate molded product is a parison that is the subject of blow molding to produce a bottle container whose opening is the mouth portion of the final molded product, and the portion of the intermediate molded product that expands in the second region is molded to form the shoulder, body, and bottom portion of the bottle container. The blow molding mechanism according to claim 1.

5. Equipped with a blow molding mechanism, The aforementioned blow molding mechanism, A mold having a first region that accommodates at least a portion of the part of a bottomed cylindrical intermediate molded product having an opening, on the side of the opening from the boundary between the part that will become the neck and the part that will become the shoulder of the final molded product, and a second region that accommodates the part on the opposite side of the opening from the boundary, An air output unit that outputs air from the tip of a long-axis tube inserted into the intermediate molded product through the aforementioned opening to inflate the intermediate molded product, It has, The tip portion of the long-axis pipe is positioned on the side of the first region that is closer to the boundary, Mold equipment.

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