Blow molding mechanism, intermediate mold, and mold device

Abstract

Provided are a blow molding mechanism, an intermediate mold, and a mold device, the blow molding mechanism comprising: a first block mold and a second block mold which constitute a part of a mold for blow molding a preform, which is an intermediate molded article, and which are closed before the start of blow molding and open after the completion of blow molding; a first bottom mold that constitutes a part of the mold for blow molding, and that molds at least a part of the bottom of the preform on the opposite side from the mouth of a blow port in which high-pressure air during blow molding is formed; and a suction device that sucks the first block mold and the second block mold after the blow molding is completed and after the first block mold and the second block mold are opened and before the bottle container is separated from the first bottom mold due to a change in posture of the bottle container which is a final molded product as a result of the blow molding. The suction of at least a portion of the bottom of the bottle container is started while the first block mold and the second block mold are opened or before the first block mold and the second block mold are opened.

Description

[0001] This application claims priority based on Japanese Patent Application No. 2023-216654 filed on December 22, 2023. The entire content of the Japanese application is incorporated herein by reference. Technical Field

[0002] The present invention relates to a blow molding mechanism, an intermediate mold, and a mold device. Background Art

[0003] In an injection blow molding method in which injection molding and blow molding are performed in two stages, a preform as an intermediate molded product is molded by injection molding, and air is blown into the inside of the preform and stretched by blow molding, thereby molding a product such as a container. In blow molding, a split mold that can be separated into multiple parts is used (for example, Patent Document 1).

[0004] Patent Document 1: Japanese Patent No. 4425750

[0005] When blow molding is completed, the split mold is opened and the final molded product is taken out. As a method of taking out the final molded product from the opened split mold, there is a method of allowing the final molded product to freely fall. However, when the split mold is opened, the posture of the final molded product becomes unstable, and it may be damaged by contacting the split mold during free fall. Summary of the Invention

[0006] An object of the present invention is to suppress contact between the final molded product that freely falls from the opened split mold after blow molding and the opened split mold.

[0007] The present invention completed based on this object is a blow molding mechanism, characterized by having: a split mold that constitutes a part of a mold for blow molding an intermediate molded product, closes before the start of the blow molding, and opens after the end of the blow molding; a first bottom mold that constitutes a part of the mold and molds at least a part of the bottom on the side opposite to the mouth portion where the blow port of the fluid in the blow molding is formed in the intermediate molded product; and a suction mechanism that starts suction of at least a part of the bottom of the final molded product at the same time as the split mold is opened or before the split mold is opened, after the blow molding is completed, after the split mold is opened, and before the final molded product is separated from the first bottom mold due to a change in the posture of the final molded product as a result of the blow molding.

[0008] Here, a second bottom mold may also be provided, and the second bottom mold is disposed at a part that penetrates a part of the first bottom mold along the axial direction of the intermediate molded product and molds at least a part of the bottom.

[0009] Further, the suction mechanism can suck at least a part of the bottom through the gap between the second bottom die and the first bottom die formed around the second bottom die.

[0010] Moreover, it can be as follows: The split die includes: a first split die that forms the mouth part; and a second split die that forms the main body part which is the part other than the mouth part and the bottom part. After the blow molding is completed, after the first split die and the second split die are opened and before the final molded product, which is the result of this blow molding, separates from the first bottom die due to the posture change of the final molded product, simultaneously with the opening of the first split die and the second split die, or before the opening of the first split die and the second split die, the suction starts.

[0011] Furthermore, the present invention is an intermediate die having a blow molding mechanism for blow molding an intermediate molded product. The intermediate die is characterized in that the blow molding mechanism has: a split die that forms a part of the die for blow molding the intermediate molded product, closes before the start of the blow molding, and opens after the completion of the blow molding; a first bottom die that forms a part of the die and molds at least a part of the bottom on the side opposite to the mouth part where the blow port of the fluid in the blow molding is formed in the intermediate molded product; and a suction mechanism that starts sucking at least a part of the bottom of the final molded product after the completion of the blow molding, after the split die is opened and before the final molded product separates from the first bottom die due to the posture change of the final molded product, simultaneously with the opening of the split die, or before the opening of the split die.

[0012] Moreover, the present invention is a die device including a fixed-side die, a movable-side die, and an intermediate die having a blow molding mechanism for blow molding an intermediate molded product. The die device is characterized in that the blow molding mechanism of the intermediate die has: a split die that forms a part of the die for blow molding the intermediate molded product, closes before the start of the blow molding, and opens after the completion of the blow molding; a first bottom die that forms a part of the die and molds at least a part of the bottom on the side opposite to the mouth part where the blow port of the fluid in the blow molding is formed in the intermediate molded product; and a suction mechanism that starts sucking at least a part of the bottom of the final molded product after the completion of the blow molding, after the split die is opened and before the final molded product separates from the first bottom die due to the posture change of the final molded product, simultaneously with the opening of the split die, or before the opening of the split die.

[0013] Advantages of the Invention

[0014] According to the present invention, it is possible to suppress contact between the finally formed product that freely falls from the split molds after mold opening and the split molds after mold opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a cross-sectional view showing an example of the structure of the blow molding mechanism according to the present embodiment.

[0016] Figure 2 is a flowchart showing the flow of operations in the intermediate mold to which the blow molding mechanism is applied.

[0017] Figure 3 In (A) and (B) are diagrams showing the flow of operations of the blow molding mechanism after blow molding is completed.

[0018] Figure 4 is a diagram showing an example in which the suction device does not start suction when the first split mold and the second split mold start to open.

[0019] In the figure: 1 - blow molding mechanism, 11 - first split mold, 12 - second split mold, 13 - first bottom mold, 14 - second bottom mold, 15 - suction device, 100 - through hole, 101 - gap, 200 - bottle container, 201 - mouth portion, 202 - main body portion, 203 - bottom portion, 204 - concave portion, 205 - convex portion. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0021] <Structure of the Blow Molding Mechanism>

[0022] Figure 1 is a cross-sectional view showing an example of the structure 1 of the blow molding mechanism according to the present embodiment. In Figure 1 it shows the state when the blow molding mechanism 1 is viewed from the upper side in the vertical direction toward the lower side. Therefore, Figure 1 the front side of the drawing becomes the upper side in the vertical direction, and the far side of the drawing becomes the lower side in the vertical direction.

[0023] Figure 1 The shown blow molding mechanism 1 is a mechanism of an intermediate mold included in a mold device for injection blow molding. The intermediate mold to which the blow molding mechanism 1 is applied is a so-called rotary mold disposed between a fixed-side mold (not shown) and a movable-side mold. Injection blow molding is a molding method that performs injection molding (hereinafter, referred to as "injection molding".) and blow molding (hereinafter, referred to as "blow molding".) in two stages. Injection molding is performed in a state where the fixed-side mold and the intermediate mold are closed. And, blow molding is performed in a state where the movable-side mold and the intermediate mold are closed.

[0024] In injection blow molding, first, a preform (not shown) as an intermediate molded product is molded in injection molding as the first-stage molding. Next, in blow molding as the second-stage molding, high-pressure air is blown into the inside of the preform and stretched, thereby molding the final molded product. As a method of blowing air into the inside of the preform in blow molding, for example, a method of protruding a stretching rod (not shown) capable of outputting high-pressure air into the preform can be cited.

[0025] In Figure 1 , a substantially cylindrical bottle container 200 as a final molded product formed by blow molding in a mold in a closed mold state is shown. The axial direction of the bottle container 200 in the closed mold state is the left-right direction in the drawing and becomes the same direction as the direction in which the intermediate mold and the movable-side mold of the blow molding mechanism 1 open and close. Hereinafter, the direction in which the intermediate mold and the movable-side mold of the blow molding mechanism 1 open and close ( Figure 1 the left-right direction in the drawing in Figure 1 ) is referred to as the "first direction". Moreover, the right side in the drawing in the first direction is referred to as the "first side", and the left side in the drawing in the first direction is referred to as the "second side". And, the direction orthogonal to the first direction ( Figure 1 the up-down direction in the drawing in

[0026] is referred to as the "second direction". Moreover, the upper side in the drawing in the second direction is referred to as the "third side", and the lower side in the drawing in the second direction is referred to as the "fourth side". Figure 1 The filled portion of the cross section of the bottle container 200 represents the portion where the preform is stretched by blow molding. However, in reality, the stretched portion and the non-stretched portion by blow molding are not clearly distinguished. Therefore,

[0027] The bottle container 200 has a mouth portion 201, a body portion 202, and a bottom portion 203. In addition, the mouth portion 201, the body portion 202, and the bottom portion 203 are portions having the continuous shape of the bottle container 200 and do not have a clear boundary. Therefore, in the present embodiment, the mouth portion 201 is set as the portion held by the first split mold 11 described later and injection molded. Specifically, the mouth portion 201 is set to include the vicinity of the end portion on the first side in the first direction of the bottle container 200, that is, the surface 251 on the first side in the first direction of the flange 206 and the external thread 207 that is screwed with the internal thread of the cap (not shown) of the bottle container 200.

[0028] Further, the bottom portion 203 is provided as a portion formed by the following first bottom mold 13 and second bottom mold 14. Specifically, the bottom portion 203 is provided as a portion near the end of the second side in the first direction of the bottle container 200. Further, the main body portion 202 is provided as a portion formed by the following second split mold 12. Specifically, the main body portion 202 is provided as a portion of the bottle container 200 other than the mouth portion 201 and the bottom portion 203.

[0029] The blow molding mechanism 1 includes a first split mold 11, a second split mold 12, a first bottom mold 13, and a second bottom mold 14 as molds. Further, the blow molding mechanism 1 includes a suction device 15 for sucking the bottle container 200. The first split mold 11 is a split mold capable of opening and closing in the second direction, and functions as a mold for injection molding and blow molding. The first split mold 11 forms the mouth portion 201 in the closed state during injection molding, and holds the mouth portion 201 in the closed state during blow molding. Further, the first split mold 11 releases the mouth portion 201 by opening the mold after the blow molding is completed. The first split mold 11 is also referred to as a split mold or a mouth splitting mold.

[0030] The second split mold 12 is a split mold capable of opening and closing in the second direction, and functions as a mold for blow molding. The second split mold 12 forms the main body portion 202 in the closed state during blow molding. Further, the second split mold 12 releases the main body portion 202 by opening the mold after the blow molding is completed. The second split mold 12 is also referred to as a blowing mold.

[0031] The first bottom mold 13 functions as a mold for blow molding. The first bottom mold 13 forms at least a part of the bottom portion 203 during blow molding. A through hole 100 penetrating in the first direction is provided in the first bottom mold 13. The through hole 100 is disposed on the extension line of the center line 300 of the bottle container 200 in the state where the first split mold 11 and the second split mold 12 are closed, and forms a space in which the following second bottom mold 14 can be disposed. The diameter of the through hole 100 is slightly larger than the outer diameter of the following second bottom mold 14. Therefore, a gap 101 is formed between the first bottom mold 13 and the second bottom mold 14 in the state where the second bottom mold 14 is disposed in the through hole 100.

[0032] In Figure 1In this case, the boundary portions between the first divided mold 11 and the second divided mold 12 and between the second divided mold 12 and the first bottom mold 13 are respectively shown as being in contact, but actually there are minute gaps formed that enable the opposing surfaces to slide. That is, minute gaps that enable the opposing surfaces to slide are respectively formed at the boundary portion between the first divided mold 11 and the second divided mold 12 and at the boundary portion between the second divided mold 12 and the first bottom mold 13. Therefore, the first divided mold 11 can slide relative to the second divided mold 12 in the second direction, and the second divided mold 12 can slide relative to the first divided mold 11 in the second direction. Also, the second divided mold 12 can slide relative to the first bottom mold 13 in the second direction.

[0033] The second bottom mold 14 is a cylindrical metal component configured to slightly protrude from the through-hole 100 toward the first side in the first direction and functions as a mold for blow molding. The second bottom mold 14 can be, for example, a part of a protruding device (ejector device) having a function of pushing out the molded product and separating it from the mold. On the surface 131 on the first side in the first direction of the above-mentioned first bottom mold 13, a tubular cutout portion 132 is formed so as to surround the through-hole 100. Therefore, the second bottom mold 14 and the cutout portion 132 mold the concave portion 204 and the convex portion 205 in the bottom 203 of the bottle container 200.

[0034] The suction device 15 is composed of a vacuum pump or the like and suctions at least a part of the bottom 203 of the bottle container 200. Specifically, the suction device 15 suctions at least a part of the bottom 203 via the gap 101 formed between the first bottom mold 13 and the second bottom mold 14, which serves as a passage for air during suction.

[0035] <Flow of operations after blow molding is completed>

[0036] Figure 2 It is a flowchart showing the flow of operations in the intermediate mold to which the blow molding mechanism 1 is applied.

[0037] Figure 3 In (A) and (B), they are diagrams showing the flow of operations of the blow molding mechanism 1 after blow molding is completed.

[0038] If the bottle container 200 is molded by the completion of blow molding based on the blow molding mechanism 1 (step S21), then the closed intermediate mold and the movable-side mold start to open (step S22). Then, the suction device 15 of the blow molding mechanism 1 starts to suction at least a part of the bottom 203 of the bottle container 200 (step S23). The posture of the bottle container 200 at this moment becomes the state shown above Figure 1 That is, it becomes a state in which the center line 300 of the bottle container 200 does not change.

[0039] When the suction device 15 starts suction, the first split mold 11 and the second split mold 12 start to open (step S24). In Figure 3 Figure (A) shows the state after the first split mold 11 and the second split mold 12 start to open. The first split mold 11 and the second split mold 12 can start to open simultaneously, or the first split mold 11 can start to open after the second split mold 12 has just started to open.

[0040] When the first split mold 11 and the second split mold 12 start to open, the suction device 15 continues to suction the bottom 203 of the bottle container 200. Therefore, even after the first split mold 11 and the second split mold 12 have just started to open, the posture of the bottle container 200 will not be disordered, and it maintains the same state as the state Figure 1 shown above, that is, the state in which the center line 300 of the bottle container 200 does not change. In addition, for an example of the case where the suction device 15 does not suction when the first split mold 11 and the second split mold 12 start to open, refer to Figure 4 which will be described later.

[0041] Regarding the suction force of the suction device 15, as long as it is the suction force that can maintain the posture of the bottle container 200 when the first split mold 11 and the second split mold 12 start to open, it does not need to be the suction force to support the own weight of the bottle container 200. Therefore, even after the first split mold 11 and the second split mold 12 start to open and the suction device 15 continues to suction, the bottle container 200 will start to freely fall due to its own gravity. Specifically, the bottle container 200 starts to freely fall towards the Figure 3 far side of the drawing in (B). The adsorption device 15 stops suction during the period from when the first split mold 11 and the second split mold 12 start to open until the opening is completed (step S25).

[0042] <Comparative Example>

[0043] Figure 4 is a diagram showing an example in which the suction device 15 does not start suction when the first split mold 11 and the second split mold 12 start to open.

[0044] As shown in the reference Figures 1 to 3As described in (A) and (B) above, in the blow molding mechanism 1 according to the present embodiment, when the blow molding is completed and the intermediate mold and the movable-side mold start to open, the suction device 15 starts to suck at least a part of the bottom 203 of the bottle container 200. Further, when the first split mold 11 and the second split mold 12 start to open, the bottle container 200 starts to freely fall due to its own weight. Regarding the suction device 15, suction is continued when the first split mold 11 and the second split mold 12 start to open. Therefore, before the first split mold 11 and the second split mold 12 start to open and immediately after they start to open, the posture of the bottle container 200 is maintained except in the vertical direction (gravity direction). As a result, the bottle container 200 starts to freely fall in a stable state where the inclination of the center line 300 to the third or fourth side in the second direction is suppressed.

[0045] In contrast, when the suction device 15 does not suck the bottom 203 of the bottle container 200 at the moment when the first split mold 11 and the second split mold 12 start to open, the posture of the bottle container 200 is not maintained before the first split mold 11 and the second split mold 12 start to open and immediately after they start to open. For example, as shown in the example of Figure 4 , the mouth portion 201 of the bottle container 200 sometimes inclines to the fourth side in the second direction, and although not shown, the mouth portion 201 of the bottle container 200 sometimes inclines to the third side in the second direction. At this time, the bottle container 200 cannot maintain not only the posture in the vertical direction (gravity direction) but also the posture in other directions. Therefore, the bottle container 200 starts to freely fall in an unstable state where the center line 300 inclines to the third or fourth side in the second direction. As a result, there is a possibility of damage due to contact with the first split mold 11 or the second split mold 12 during the fall.

[0046] Here, referring to the above Figure 3 (A) and Figure 4 , the reason why the posture of the bottle container 200 is not maintained before the first split mold 11 and the second split mold 12 start to open and immediately after they start to open will be described. When the first split mold 11 and the second split mold 12 start to open, a force (hereinafter referred to as "demolding force") by which the first split mold 11 and the second split mold 12 attempt to pull the bottle container 200 acts. Then, the bottle container 200 is sometimes affected by the demolding force and its posture is disturbed. Further, the bottle container 200 sometimes gets slightly stuck on the first split mold 11 or the second split mold 12 when the first split mold 11 and the second split mold 12 open, and its posture is disturbed. Moreover, the bottle container 200 is sometimes affected by minute vibrations generated by the operation accompanying the opening of the first split mold 11 and the second split mold 12, and its posture is disturbed.

[0047] In contrast, as in the present embodiment, if the suction device 15 continues to suck when the first split mold 11 and the second split mold 12 start to open, the posture of the bottle container 200 is maintained before the start of mold opening and immediately after the start of mold opening. That is, the suction force of the suction device 15 cannot suppress the posture in the vertical direction when the bottle container 200 freely falls, but can suppress the posture of the bottle container 200 from being disturbed in directions other than the vertical direction due to the demolding force. Moreover, the suction force of the suction device 15 can suppress the posture in the second direction from being disturbed by slightly getting stuck in the first split mold 11 or the second split mold 12 when the first split mold 11 and the second split mold 12 open, or from being disturbed by minute vibrations generated by the actions accompanying the opening of the first split mold 11 and the second split mold 12. As a result, the bottle container 200 starts to freely fall in a stable state where the center line 300 is suppressed from tilting toward the third side or the fourth side in the second direction.

[0048] In summary, the blow molding mechanism and the intermediate mold of the present invention can be configured as follows and can adopt various embodiments.

[0049] That is, the blow molding mechanism 1 according to the present embodiment includes: split molds (for example, the first split mold 11 and the second split mold 12), which form a part of the mold for blow molding a preform as an intermediate molded product, close the mold before the start of blow molding, and open the mold after the end of blow molding; a first bottom mold 13, which forms a part of the mold for blow molding and molds at least a part of the bottom 203 on the side opposite to the mouth portion 201 where the blow port 208 of the fluid (for example, high-pressure air) in blow molding is formed in the preform; and a suction device 15, which, after the end of blow molding, starts to suck at least a part of the bottom 203 of the bottle container 200 at the same time as the split molds open or before the split molds open, after the split molds open and before the bottle container 200 separates from the first bottom mold 13 due to the posture change of the bottle container 200, which is the result of blow molding.

[0050] Thus, in the blow molding mechanism 1, when blow molding ends and the intermediate mold and the movable-side mold start to open, the suction device 15 starts to suck at least a part of the bottom 203 of the bottle container 200. Moreover, when the split molds start to open, the bottle container 200 starts to freely fall due to its own weight. Here, the suction device 15 continues to suck when the split molds start to open. Therefore, the posture of the bottle container 200 is maintained before the split molds start to open and immediately after the start of mold opening. As a result, the bottle container 200 starts to freely fall in a stable state where the center line 300 is suppressed from tilting toward the third side or the fourth side in the second direction, so that the bottle container 200 can be prevented from being damaged by contacting the split molds when falling.

[0051] Here, a second bottom mold 14 may also be provided. The second bottom mold 14 is disposed through a part of the first bottom mold 13 and forms at least a part of the bottom 203.

[0052] Thus, the second bottom mold 14 forms at least a part of the bottom 203 of the bottle container 200, so that the bottom 203 can be formed by the combination of the first bottom mold 13 and the second bottom mold 14. Moreover, a gap 101 is formed between the first bottom mold 13 and the second bottom mold 14 for the suction device 15 to suck at least a part of the bottom 203 of the bottle container 200.

[0053] And, the suction device 15 can suck at least a part of the bottom 203 of the bottle container 200 through the gap 101 between the second bottom mold 14 and the first bottom mold 14 formed around the second bottom mold 14.

[0054] Thus, at least a part of the bottom 203 of the bottle container 200 is sucked through the gap 101 between the second bottom mold 14 and the first bottom mold 14 formed around the second bottom mold 14. As a result, the posture of the bottle container 200 can be maintained.

[0055] And, it may be as follows: The split mold includes: a first split mold 11 that forms the mouth part 201 of the bottle container 200; and a second split mold 12 that forms the main body part 202 except for the mouth part 201 and the bottom 203. After the blow molding is completed, after the first split mold 11 and the second split mold 12 are opened and before the bottle container 200 is separated from the first bottom mold 13 due to the posture change of the final molded product, the bottle container 200, as a result of the blow molding, the suction device 15 starts to suck at least a part of the bottom 203 of the bottle container 200 at the same time when the first split mold 11 and the second split mold 12 are opened, or before the first split mold 11 and the second split mold 12 are opened separately.

[0056] Thus, in the blow molding mechanism 1, when the blow molding is completed and the intermediate mold and the movable side mold start to open, the suction device 15 starts to suck at least a part of the bottom 203 of the bottle container 200. Moreover, when the first split mold 11 and the second split mold 12 start to open, the bottle container 200 starts to freely fall due to its own gravity. Here, the suction device 15 continuously sucks when the first split mold 11 and the second split mold 12 start to open. Therefore, the posture of the bottle container 200 is maintained before and just after the first split mold 11 and the second split mold 12 start to open. As a result, the bottle container 200 starts to freely fall in a stable state where the center line 300 is suppressed from tilting to the third side or the fourth side in the second direction, so that it is possible to prevent the bottle container 200 from being damaged by contacting the split mold when falling.

[0057] Moreover, the intermediate mold of the present invention can be implemented as long as it has the following structure, and various implementation manners can be adopted.

[0058] That is, the intermediate mold according to the present embodiment is an intermediate mold having a blow molding mechanism 1 for blow molding a preform as an intermediate molded product. The intermediate mold is characterized in that the blow molding mechanism 1 includes: a first split mold 11 and a second split mold 12, which form a part of the mold for blow molding the preform as the intermediate molded product, close the mold before the start of blow molding, and open the mold after the end of blow molding; a first bottom mold 13, which forms a part of the mold for blow molding and molds at least a part of the bottom 203 on the side opposite to the mouth portion 201 where the blow port 208 of the fluid in the blow molding is formed in the preform; and a suction device 15, which starts sucking at least a part of the bottom 203 of the bottle container 200 at the same time as the first split mold 11 and the second split mold 12 open, or before the first split mold 11 and the second split mold 12 open, after the first split mold 11 and the second split mold 12 open and before the bottle container 200 separates from the first bottom mold 13 due to the posture change of the final molded product, the bottle container 200, as a result of blow molding.

[0059] Thus, in the blow molding mechanism 1 of the intermediate mold, when the blow molding is completed and the intermediate mold and the movable-side mold start to open, the suction device 15 starts sucking at least a part of the bottom 203 of the bottle container 200. Moreover, when the first split mold 11 and the second split mold 12 start to open, the bottle container 200 starts to freely fall due to its own gravity. Here, the suction device 15 continues to suck when the first split mold 11 and the second split mold 12 start to open. Therefore, the posture of the bottle container 200 is maintained before and immediately after the first split mold 11 and the second split mold 12 start to open. As a result, the bottle container 200 starts to freely fall in a stable state where the center line 300 is inhibited from tilting to the third side or the fourth side in the second direction, so that the bottle container 200 can be prevented from being damaged by contacting the split mold when falling.

[0060] Moreover, the mold device of the present invention can be implemented as long as it has the following structure, and various implementation manners can be adopted.

[0061] That is, the mold device according to this embodiment is a mold device that includes a fixed-side mold, a movable-side mold, and an intermediate mold having a blow molding mechanism 1 for blow molding an intermediate molded product. The mold device is characterized in that the blow molding mechanism 1 of the intermediate mold has: a first split mold 11 and a second split mold 12, which form a part of the mold for blow molding a preform as the intermediate molded product, close the mold before the start of blow molding, and open the mold after the end of blow molding; a first bottom mold 13, which forms a part of the mold for blow molding and molds at least a part of the bottom 203 on the side opposite to the mouth part 201 where the blow port 208 of the fluid in blow molding is formed in the preform; and a suction device 15, which, after the end of blow molding, starts sucking at least a part of the bottom 203 of the bottle container 200 at the same time as the opening of the first split mold 11 and the second split mold 12, or before the opening of the first split mold 11 and the second split mold 12, after the opening of the first split mold 11 and the second split mold 12 and before the bottle container 200 is separated from the first bottom mold 13 due to the posture change of the bottle container 200, which is the resultant of blow molding.

[0062] Thus, in the blow molding mechanism 1 of the intermediate mold, when blow molding ends and the intermediate mold and the movable-side mold start to open, the suction device 15 starts sucking at least a part of the bottom 203 of the bottle container 200. Moreover, when the first split mold 11 and the second split mold 12 start to open, the bottle container 200 starts to freely fall due to its own gravity. Here, the suction device 15 continues to suck when the first split mold 11 and the second split mold 12 start to open. Therefore, before and immediately after the first split mold 11 and the second split mold 12 start to open, the posture of the bottle container 200 is maintained. As a result, the bottle container 200 starts to freely fall in a stable state where the inclination of the center line 300 to the third side or the fourth side in the second direction is suppressed, and thus damage to the bottle container 200 caused by contact with the split mold during falling can be suppressed.

[0063] <Others>

[0064] The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments. Also, the effects based on the present invention are not limited to the effects described in the above embodiments. For example, Figure 1 The structures of the blow molding mechanism 1 shown are merely examples for achieving the object of the present invention and are not particularly limited.

[0065] Moreover, Figure 2 The order of the steps of the operations shown is also merely an example and is not particularly limited. Not only in accordance with Figure 2The order of the steps illustrated in the figure is processed in chronological order, but it may not necessarily be processed in chronological order, but rather in parallel or independently. For example, in Figure 2 it is shown that in step S22, the intermediate mold and the movable-side mold start to open, and in step S23, the suction device 15 of the blow molding mechanism 1 starts to suck, but the order of step S22 and step S23 can also be reversed. That is, the suction device 15 of the blow molding mechanism 1 can start to suck before the intermediate mold and the movable-side mold start to open. More specifically, the suction device 15 of the blow molding mechanism 1 can start to suck before step S24 in which the first split mold 11 and the second split mold 12 start to open.

[0066] Moreover, the movement of the bottle container 200 when the first split mold 11 and the second split mold 12 start to open varies depending on the suction force of the suction device 15 or the shapes of the first bottom mold 13 and the second bottom mold 14, etc. For example, by increasing the suction force of the suction device 15, it is possible to easily maintain the posture of the bottle container 200. And it is possible to slightly delay the moment when the bottle container 200 starts to freely fall. Also, by changing the shapes of the first bottom mold 13 or the second bottom mold 14 to increase the diameter of the gap 101, it is also possible to increase the suction force. At this time, it is also possible to easily maintain the posture of the bottle container 200, and it is also possible to slightly delay the moment when the bottle container 200 starts to freely fall.

[0067] And in the above-described embodiment, there is no particular limitation on the speed of the operation of opening the first split mold 11 and the second split mold 12, but by delaying the operation of opening the first split mold 11 and the second split mold 12, the influence of the demolding force can be suppressed. Also, by gradually (or step by step) switching the speed of the operation of opening the first split mold 11 and the second split mold 12 from a slow speed to a fast speed, the influence of the demolding force can also be suppressed. In these cases, it is possible to suppress the bottle container 200 from being affected by the demolding force and disturbing its posture, but since the operation of opening the first split mold 11 and the second split mold 12 becomes slower, the overall working efficiency decreases.

[0068] And in the above-described embodiment, the final molded product is the bottle container 200, but the final molded product is not necessarily the bottle container. As long as it is a molded product formed by injection blow molding.

[0069] And the blow molding mechanism 1 related to the above-described embodiment is premised on being applied to a device for performing an injection molding (injection molding) and a blow molding (blow molding) in two stages, that is, an injection blow molding device, but it can also be applied to a device that only performs blow molding.

[0070] In the above-described embodiment, the suction device 15 starts suction before the first split mold 11 and the second split mold 12 are opened, but it is not limited thereto. As long as a certain method is used to maintain the posture of the bottle container 200 when the first split mold 11 and the second split mold 12 are opened, the suction device 15 may also start suction after the first split mold 11 and the second split mold 12 are opened. At this time, as a method of maintaining the posture of the bottle container 200, for example, a method of sucking a part of the bottle container 200 by another suction device (not shown) other than the suction device 15, or a method of maintaining the posture of the bottle container 200 by the first split mold 11, the second split mold 12, or other components may be cited.

Claims

1. A blow molding mechanism, characterized in that: have: The segment mold constitutes a part of the mold for blow molding the intermediate molded product, the mold is closed before the blow molding starts, and the mold is opened after the blow molding is completed; a first bottom mold constituting a part of the mold and molding at least a part of the bottom of the intermediate molded product on the side opposite to the mouth portion where the blow molding port of the fluid in the blow molding is formed; and A suction mechanism starts sucking at least a portion of the bottom of the final molded product at the same time as the split mold is opened or before the split mold is opened after the blow molding is completed, after the split mold is opened and before the final molded product, which is a result of the blow molding, is separated from the first bottom mold due to a change in the posture of the final molded product.

2. The blow molding mechanism according to claim 1, characterized in that: The intermediate mold further includes a second bottom mold, which is disposed at a portion penetrating a portion of the first bottom mold in the axial direction of the intermediate molded product and molds at least a portion of the bottom portion.

3. The blow molding mechanism according to claim 2, characterized in that: The suction mechanism sucks at least a portion of the bottom portion through a gap formed around the second bottom mold and between the second bottom mold and the first bottom mold.

4. The blow molding mechanism according to claim 1, characterized in that: The block mold includes: a first block mold for molding the mouth; and a second block mold for molding the main body which is the part other than the mouth and the bottom. The suction mechanism starts the suction after the blow molding is completed, after the first block mold and the second block mold are opened and before the final molded product is separated from the first base mold due to a change in the posture of the final molded product as a result of the blow molding, at the same time as the first block mold and the second block mold are opened, or before the first block mold and the second block mold are opened.

5. An intermediate mold having a blow molding mechanism for blow molding an intermediate molded product, wherein the intermediate mold is characterized in that: The blow molding mechanism comprises: The segment mold constitutes a part of the mold for blow molding the intermediate molded product, the mold is closed before the blow molding starts, and the mold is opened after the blow molding is completed; a first bottom mold constituting a part of the mold and molding at least a part of the bottom of the intermediate molded product on the opposite side of the mouth portion where the blow molding port of the fluid in the blow molding is formed; and A suction mechanism starts sucking at least a portion of the bottom of the final molded product at the same time as the split mold is opened or before the split mold is opened after the blow molding is completed, after the split mold is opened and before the final molded product, which is a result of the blow molding, is separated from the first bottom mold due to a change in the posture of the final molded product.

6. A mold device comprising a fixed side mold, a movable side mold, and an intermediate mold having a blow molding mechanism for blow molding an intermediate molded product, wherein the mold device is characterized in that: The blow molding mechanism of the intermediate mold has: The segment mold constitutes a part of the mold for blow molding the intermediate molded product, the mold is closed before the blow molding starts, and the mold is opened after the blow molding is completed; a first bottom mold constituting a part of the mold and molding at least a part of the bottom of the intermediate molded product on the opposite side of the mouth portion where the blow molding port of the fluid in the blow molding is formed; and A suction mechanism starts sucking at least a portion of the bottom of the final molded product at the same time as the split mold is opened or before the split mold is opened after the blow molding is completed, after the split mold is opened and before the final molded product, which is a result of the blow molding, is separated from the first bottom mold due to a change in the posture of the final molded product.

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