Blow molding mechanism, intermediate mold, and mold device

Abstract

To suppress contacts of a final molding that is free-falling from a split mold of an open mold after completion of blow molding to the split mold of the open mold.SOLUTION: A blow molding mechanism 1 includes: a first split mold 11 and a second split mold 12 constituting part of a mold used in blow molding to a preform that is an intermediate molding, closing before starting blow molding, and opening after completion of blow molding; a first bottom mold 13 constituting a part of a mold used in blow molding for molding at least a part of a bottom 203 becoming an opposite side of a port part 201 provided with a blow port of a high-pressure air in blow molding among a preform; and a suction apparatus 15, after completion of blow molding, and after opening the first split mold 11 and the second split mold 12 and before a bottle container 200 which is the final molding as the result product of blow molding leaves the first bottom mold 13 by a posture change of the bottle container 200, at least a part of suction of a bottom 203 of the bottle container 200 is started simultaneously with opening the first split mold 11 and the second split mold 12 or before opening the first split mold 11 and the second split mold 12.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an injection molding mechanism, an intermediate mold, and a mold device.

Background Art

[0002] In injection blow molding, which is a molding method that performs injection molding (injection molding) and blow molding (injection molding) in two stages, a preform, which is an intermediate molded product, is molded by injection molding, and a product such as a container is molded by blowing air into the preform and stretching it. In injection molding, a split mold that can be separated into a plurality of parts is used (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When injection molding is completed, the split mold opens 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 freely dropping the final molded product. However, when the split mold opens, the posture of the final molded product becomes unstable, and it may come into contact with the split mold during free fall and get damaged. An object of the present invention is to suppress contact between the final molded product that freely falls from the opened split mold after injection molding is completed and the split mold that opens.

Means for Solving the Problems

[0005] The present invention completed for such an object constitutes a part of a mold used for blow molding of an intermediate molded product, closes the mold before the start of the blow molding, and opens the mold after the completion of the blow molding. It includes a split mold, a part of the mold that forms at least a part of the bottom on the opposite side of the mouth part where the fluid injection port in the blow molding is formed among the intermediate molded products, and a first bottom mold. After the completion of the blow molding and after the split mold is opened, before the final molded product, which is the result of the blow molding, separates from the first bottom mold due to a change in the posture of the final molded product, the suction means starts suction of at least a part of the bottom of the final molded product simultaneously with the opening of the split mold or before the split mold is opened. It is a blow molding mechanism characterized by having such components. Here, a part of the first bottom mold may be arranged in a portion penetrating in the axial direction of the intermediate molded product, and a second bottom mold for forming at least a part of the bottom may be further provided. Also, the suction means may suction at least a part of the bottom through a gap between the second bottom mold and the first bottom mold formed around the second bottom mold. Further, the split mold includes a first split mold for forming the mouth part and a second split mold for forming a main body part which is a part other than the mouth part and the bottom part. The suction means starts the suction after the completion of the blow molding, after the first split mold and the second split mold are opened, and before the final molded product, which is the result of the blow molding, separates from the first bottom mold due to a change in the posture of the final molded product, simultaneously with the opening of the first split mold and the second split mold or before the first split mold and the second split mold are opened. Further, the present invention relates to an intermediate mold having a blow molding mechanism for performing blow molding on an intermediate molded product. The blow molding mechanism constitutes a part of the mold used for blow molding on the intermediate molded product, closes the mold before the start of the blow molding, and opens the mold after the completion of the blow molding. It includes a split mold, a first bottom mold that constitutes a part of the mold and molds at least a part of the bottom on the opposite side of the mouth portion where the fluid injection port is formed in the intermediate molded product during the blow molding, and a suction means that starts sucking at least a part of the bottom of the final molded product at the same time as the split mold opens, or before the split mold opens, after the completion of the blow molding and after the split mold opens, and before the final molded product separates from the first bottom mold due to a change in the posture of the final molded product which is the result of the blow molding. The intermediate mold is characterized by having these components. Further, the present invention relates to a mold apparatus including a fixed-side mold, an intermediate mold having a blow molding mechanism for performing blow molding on an intermediate molded product, and a movable-side mold. The blow molding mechanism of the intermediate mold constitutes a part of the mold used for blow molding on the intermediate molded product, closes the mold before the start of the blow molding, and opens the mold after the completion of the blow molding. It includes a split mold, a first bottom mold that constitutes a part of the mold and molds at least a part of the bottom on the opposite side of the mouth portion where the fluid injection port is formed in the intermediate molded product during the blow molding, and a suction means that starts sucking at least a part of the bottom of the final molded product at the same time as the split mold opens, or before the split mold opens, after the completion of the blow molding and after the split mold opens, and before the final molded product separates from the first bottom mold due to a change in the posture of the final molded product which is the result of the blow molding. The mold apparatus is characterized by having these components.

Advantages of the Invention

[0006] According to the present invention, it is possible to suppress the final molded product that freely falls from the split mold that has opened after the completion of the blow molding from contacting the split mold that opens.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0008] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. <Configuration of the Blow Molding Mechanism> FIG. 1 is a cross-sectional view showing an example of the configuration of the blow molding mechanism 1 according to the present embodiment. FIG. 1 shows a state of viewing the blow molding mechanism 1 from the top side to the bottom side in the vertical direction. For this reason, the front side of the drawing in FIG. 1 is the top side in the vertical direction, and the back side of the drawing is the bottom side in the vertical direction.

[0009] The blow molding mechanism 1 shown in FIG. 1 is a mechanism applied to an intermediate mold provided in a mold device that performs 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 and a movable-side mold (not shown). Injection blow molding refers to 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. Also, blow molding is performed in a state where the movable-side mold and the intermediate mold are closed.

[0010] In injection blow molding, first, in injection molding which is the first stage of molding, a preform (not shown) which is an intermediate molded product is molded. Next, in blow molding which is the second stage of molding, a final molded product is molded by blowing and stretching high-pressure air into the inside of the preform. Examples of the method of blowing air into the inside of the preform in blow molding include a method of protruding a stretching rod (not shown) capable of outputting high-pressure air into the preform.

[0011] FIG. 1 shows a substantially cylindrical bottle container 200 as a final molded product, which is blow-molded in a mold in a mold-closed state. The axial direction of the bottle container 200 in the mold-closed state is the left-right direction in the drawing, and is the same direction as the direction in which the intermediate mold to which the blow molding mechanism 1 is applied and the movable-side mold open and close. Hereinafter, the direction in which the intermediate mold to which the blow molding mechanism 1 is applied and the movable-side mold open and close (the left-right direction in FIG. 1) is referred to as the "first direction". Further, 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". Also, the direction orthogonal to the first direction (the up-down direction in FIG. 1) is referred to as the "second direction". Further, 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".

[0012] The shaded portion of the cross section of the bottle container 200 indicates the portion where the preform is stretched by blow molding. However, actually, the portion that is stretched and the portion that is not stretched by blow molding are not clearly distinguished. For this reason, the boundary portion between the shaded portion and the hatched portion in the cross section of the bottle container 200 in FIG. 1 only indicates an approximate position.

[0013] The bottle container 200 has a mouth portion 201, a main body portion 202, and a bottom portion 203. Note that the mouth portion 201, the main body portion 202, and the bottom portion 203 are parts of the shape of the bottle container 200 having continuity and have no clear boundaries. Therefore, in the present embodiment, the mouth portion 201 is a portion that is gripped by the first split mold 11 described later and injection-molded. Specifically, the mouth portion 201 is near the end 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 fringe 206 and a portion including a male screw 207 that is screwed with a female screw of a cap (not shown) of the bottle container 200.

[0014] Also, the bottom portion 203 is a portion formed by the first bottom mold 13 and the second bottom mold 14 described later. Specifically, the bottom portion 203 is a portion near the end on the second side in the first direction of the bottle container 200. Also, the main body portion 202 is a portion formed by the second split mold 12 described later. Specifically, the main body portion 202 is a portion other than the mouth portion 201 and the bottom portion 203 of the bottle container 200.

[0015] 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, which are molds. Also, the blow molding mechanism 1 includes a suction device 15 that sucks the bottle container 200. The first split mold 11 is a split mold that can be opened and closed 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 a closed mold state during injection molding and grips the mouth portion 201 in a closed mold state during blow molding. Also, the first split mold 11 releases the mouth portion 201 by opening the mold after the completion of blow molding. The first split mold 11 is also called a split and parting mold.

[0016] The second split mold 12 is a split mold that can be opened and closed in the second direction and functions as a mold for blow molding. The second split mold 12 forms the main body portion 202 in a closed mold state during blow molding. Also, the second split mold 12 releases the main body portion 202 by opening the mold after the completion of blow molding. The second split mold 12 is also called a blow mold.

[0017] The first bottom mold 13 functions as an injection molding die. The first bottom mold 13 forms at least a part of the bottom 203 during injection molding. The first bottom mold 13 is provided with a through hole 100 penetrating in the first direction. The through hole 100 is arranged on the extension line of the center line 300 of the bottle container 200 in a state where the first split mold 11 and the second split mold 12 are closed, and forms a space where the second bottom mold 14 described later can be arranged. The diameter of the through hole 100 is slightly larger than the outer diameter of the second bottom mold 14 described later. For this reason, a gap 101 is formed between the first bottom mold 13 and the second bottom mold 14 in a state where the second bottom mold 14 is arranged in the through hole 100.

[0018] In FIG. 1, each of the boundary portion between the first split mold 11 and the second split mold 12 and the boundary portion between the second split mold 12 and the first bottom mold 13 is shown as being in contact, but actually, a slight gap is formed to enable the opposing surfaces to slide. That is, a slight gap is formed in each of the boundary portion between the first split mold 11 and the second split mold 12 and the boundary portion between the second split mold 12 and the first bottom mold 13 to enable the opposing surfaces to slide. For this reason, the first split mold 11 is slidable in the second direction with respect to the second split mold 12, and the second split mold 12 is slidable in the second direction with respect to the first split mold 11. Also, the second split mold 12 is slidable in the second direction with respect to the first bottom mold 13.

[0019] The second bottom mold 14 is a cylindrical metal member arranged to slightly protrude from the through hole 100 to the first side in the first direction, and functions as an injection molding die. The second bottom mold 14 may be, for example, a part of a protruding device (ejector) having a function of protruding a molded product and separating it from the mold. A tubular notch portion 132 is formed on the surface 131 on the first side in the first direction of the above-described first bottom mold 13 so as to surround the through hole 100. For this reason, the second bottom mold 14 and the notch portion 132 form the concave portion 204 and the convex portion 205 in the bottom 203 of the bottle container 200.

[0020] The suction device 15 is composed of a vacuum pump or the like, and sucks at least a part of the bottom 203 of the bottle container 200. Specifically, the suction device 15 sucks at least a part of the bottom 203 through a gap 101 formed between the first bottom mold 13 and the second bottom mold 14, which serves as a passage for air during suction.

[0021] <Flow of operations after blow molding is completed> FIG. 2 is a flowchart showing the flow of operations in the intermediate mold to which the blow molding mechanism 1 is applied. FIGS. 3(A) and (B) are diagrams showing the flow of operations of the blow molding mechanism 1 after blow molding is completed. When the bottle container 200 is formed by the completion of blow molding by the blow molding mechanism 1 (step 21), the intermediate mold that was closed and the movable mold start to open (step 22). Then, the suction device 15 of the blow molding mechanism 1 starts to suck at least a part of the bottom 203 of the bottle container 200 (step 23). The posture of the bottle container 200 at this time is the state shown in FIG. 1 described above, that is, the state in which the center line 300 of the bottle container 200 has not changed.

[0022] When the suction device 15 starts suction, the first split mold 11 and the second split mold 12 start to open (step 24). FIG. 3(A) shows the state immediately 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 may start to open simultaneously, or the first split mold 11 may start to open immediately after the second split mold 12 starts to open.

[0023] The suction device 15 continues to suck the bottom 203 of the bottle container 200 when the first split mold 11 and the second split mold 12 start to open. Therefore, even immediately after the first split mold 11 and the second split mold 12 start to open, the posture of the bottle container 200 is not disturbed, and the same state as the state shown in FIG. 1 described above, that is, the state in which the center line 300 of the bottle container 200 has not changed, is maintained. An example of the case where the suction device 15 is not sucking when the first split mold 11 and the second split mold 12 start to open will be described later with reference to FIG. 4.

[0024] The suction force of the suction device 15 only needs to be a 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 mold opening, and a suction force sufficient to support the weight of the bottle container 200 is not required. For this reason, even when the suction device 15 continues to suck after the first split mold 11 and the second split mold 12 start mold opening, the bottle container 200 starts to freely fall due to its own weight. Specifically, the bottle container 200 starts to freely fall toward the back side of the drawing in Fig. 3(B). The suction device 15 stops suction between the start of mold opening and the completion of mold opening of the first split mold 11 and the second split mold 12 (step 25).

[0025] <Comparative Example> Fig. 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 mold opening. As described with reference to Figs. 1 to 3(A) and (B), in the injection molding mechanism 1 according to the present embodiment, when injection molding is completed and the intermediate mold and the movable-side mold start mold opening, the suction device 15 starts to suck at least a part of the bottom 203 of the bottle container 200. Then, when the first split mold 11 and the second split mold 12 start mold opening, the bottle container 200 starts to freely fall due to its own weight. Since the suction device 15 continues to suck when the first split mold 11 and the second split mold 12 start mold opening, the posture of the bottle container 200 other than the vertical direction (gravity direction) is maintained before and immediately after the start of mold 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 in which the center line 300 is suppressed from tilting toward the third side or the fourth side in the second direction.

[0026] On the other hand, when the first splitting mold 11 and the second splitting mold 12 start to open the mold, if the suction device 15 is not sucking the bottom 203 of the bottle container 200, the posture of the bottle container 200 is not maintained before and immediately after the start of the mold opening of the first splitting mold 11 and the second splitting mold 12. For example, as shown in the example of FIG. 4, the mouth 201 of the bottle container 200 may tilt to the fourth side in the second direction, or although not shown, the mouth 201 of the bottle container 200 may tilt to the third side in the second direction. In this case, the bottle container 200 cannot maintain its posture in the vertical direction (gravity direction), and cannot maintain its posture in other directions either. Therefore, the center line 300 will start to free fall in an unstable state where it tilts to the third side or the fourth side in the second direction. As a result, there is a risk of contact with the first splitting mold 11 or the second splitting mold 12 during the fall and getting damaged.

[0027] Here, the reason why the posture of the bottle container 200 is not maintained before and immediately after the start of the mold opening of the first splitting mold 11 and the second splitting mold 12 will be described with reference to FIGS. 3(A) and 4 above. When the first splitting mold 11 and the second splitting mold 12 start to open the mold, a force (hereinafter referred to as the "mold release force") that the first splitting mold 11 and the second splitting mold 12 try to pull the bottle container 200 acts. Then, the bottle container 200 may have its posture disturbed under the influence of the mold release force. In addition, the bottle container 200 may be slightly caught by the first splitting mold 11 or the second splitting mold 12 when the first splitting mold 11 and the second splitting mold 12 open the mold, disturbing its posture. Furthermore, the bottle container 200 may have its posture disturbed by a slight vibration generated during the operation of the first splitting mold 11 and the second splitting mold 12 when they open the mold.

[0028] On the other hand, if the suction device 15 continues suction when the mold opening by the first split mold 11 and the second split mold 12 starts as in the present embodiment, the posture of the bottle container 200 is maintained before and immediately after the start of the mold opening. That is, the suction force of the suction device 15 cannot suppress the disturbance of the vertical posture when the bottle container 200 freely falls, but can suppress the disturbance of the posture in a direction other than the vertical direction due to the influence of the mold release force on the bottle container 200. Further, the suction force of the suction device 15 can suppress the disturbance of the second-direction posture by slightly catching 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 the mold, and the disturbance of the posture by the slight vibration generated during the operation of the first split mold 11 and the second split mold 12 opening the mold. As a result, the bottle container 200 starts free fall in a stable state where the inclination of the center line 300 to the third side and the fourth side in the second direction is suppressed.

[0029] In summary, the blow molding mechanism and the intermediate mold to which the present invention is applied can have the following configurations and can take various embodiments. That is, the blow molding mechanism 1 according to the present embodiment constitutes a part of the mold used for blow molding of a preform which is an intermediate molded product, closes the mold before the start of blow molding, and opens the mold after the completion of blow molding (for example, the first split mold 11 and the second split mold 12), and constitutes a part of the mold used for blow molding, and forms at least a part of the bottom 203 on the opposite side of the mouth part 201 where the blowing port 208 of the fluid (for example, high-pressure air) in the blow molding of the preform is formed. A first bottom mold 13 for molding, and after the completion of blow molding, before the bottle container 200 separates from the first bottom mold 13 due to a change in the posture of the bottle container 200 which is the result of blow molding after the split mold opens the mold, at the same time as the split mold opens the mold, or before the split mold opens the mold, a suction device 15 that starts suction of at least a part of the bottom 203 of the bottle container 200. It is a blow molding mechanism characterized by having.

[0030] As a result, in the blowing and molding mechanism 1, when the blowing and 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. Then, when the split mold starts 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 mold starts to open. For this reason, the posture of the bottle container 200 is maintained before the split mold starts to open and immediately after it starts to open. As a result, the bottle container 200 starts to freely fall in a stable state where the center line 300 is prevented from tilting toward the third side or the fourth side in the second direction, so that it is suppressed that the bottle container 200 contacts the split mold and gets damaged when it falls.

[0031] Here, a second bottom mold 14 may be further provided, which is disposed at a portion penetrating a part of the first bottom mold 13 and molds at least a part of the bottom 203. As a result, since the second bottom mold 14 molds at least a part of the bottom 203 of the bottle container 200, the bottom 203 can be molded by the combination of the first bottom mold 13 and the second bottom mold 14. Further, 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.

[0032] Further, the suction device 15 may 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 13 formed around the second bottom mold 14. As a result, 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 13 formed around the second bottom mold 14. As a result, the posture of the bottle container 200 can be maintained.

[0033] Further, the split mold includes a first split mold 11 for forming the mouth portion 201 of the bottle container 200 and a second split mold 12 for forming the main body portion 202 other than the mouth portion 201 and the bottom portion 203. After the blow molding is completed and the first split mold 11 and the second split mold 12 are opened, before the bottle container 200 separates from the first bottom mold 13 due to a change in the posture of the bottle container 200 which is the result of the blow molding, simultaneously with the opening of the first split mold 11 and the second split mold 12, or before each of the first split mold 11 and the second split mold 12 is opened, suction of at least a part of the bottom portion 203 of the bottle container 200 may be started.

[0034] As a result, 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 suction of at least a part of the bottom portion 203 of the bottle container 200. Then, 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. Here, the suction device 15 continues suction when the first split mold 11 and the second split mold 12 start to open. For this reason, the posture of the bottle container 200 is maintained before and immediately after the opening of the first split mold 11 and the second split mold 12 starts. As a result, the bottle container 200 starts to freely fall in a stable state in which the center line 300 is suppressed from tilting toward the third side or the fourth side in the second direction, so that it is suppressed that the bottle container 200 contacts the split mold and gets damaged when falling.

[0035] Further, the intermediate mold to which the present invention is applied may have the following configuration and can take various embodiments. That is, the intermediate mold according to the present embodiment is an intermediate mold having a blow molding mechanism 1 for performing blow molding on a preform which is an intermediate molded product. The blow molding mechanism 1 constitutes a part of the mold used for blow molding on the preform which is an intermediate molded product, and includes a first split mold 11 and a second split mold 12 that close the mold before the start of blow molding and open the mold after the completion of blow molding, a first bottom mold 13 that constitutes a part of the mold used for blow molding and molds at least a part of the bottom 203 on the opposite side to the mouth part 201 where the fluid blow port 208 in blow molding is formed in the preform, and a suction device 15 that starts suction of at least a part of the bottom 203 of the bottle container 200 simultaneously with the opening of the first split mold 11 and the second split mold 12, or before the first split mold 11 and the second split mold 12 open, after the completion of blow molding and after the first split mold 11 and the second split mold 12 open and before the bottle container 200, which is the result of blow molding, separates from the first bottom mold 13 due to the posture change of the bottle container 200. The intermediate mold is characterized by having the above.

[0036] As a result, in the blow molding mechanism 1 of the intermediate mold, when blow molding is completed and the intermediate mold and the movable-side mold start to open, the suction device 15 starts suction of at least a part of the bottom 203 of the bottle container 200. Then, 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. Here, the suction device 15 continues suction 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 suppressed from tilting toward the third side or the fourth side in the second direction, so that it is suppressed that the bottle container 200 contacts the split mold and gets damaged when it falls.

[0037] In addition, the mold device to which the present invention is applied only needs to have the following configuration and can take various embodiments. That is, the mold apparatus according to the present embodiment includes a fixed-side mold, an intermediate mold having a blow molding mechanism 1 for performing blow molding on an intermediate molded product, and a movable-side mold. The blow molding mechanism 1 of the intermediate mold constitutes a part of the mold used for blow molding on a preform, which is an intermediate molded product. The first split mold 11 and the second split mold 12 close the mold before the start of blow molding and open the mold after the completion of blow molding. The first bottom mold 13 constitutes a part of the mold used for blow molding and molds at least a part of the bottom 203 on the opposite side of the mouth part 201 where the fluid injection port 208 in the blow molding of the preform is formed. After the completion of blow molding, after the first split mold 11 and the second split mold 12 open the mold, and before the bottle container 200, which is the result of blow molding, separates from the first bottom mold 13 due to the posture change of the bottle container 200, the suction device 15 starts to suck at least a part of the bottom 203 of the bottle container 200 simultaneously with the opening of the first split mold 11 and the second split mold 12, or before the first split mold 11 and the second split mold 12 open the mold. The mold apparatus is characterized by this.

[0038] As a result, 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 mold, the suction device 15 starts to suck at least a part of the bottom 203 of the bottle container 200. Then, when the first split mold 11 and the second split mold 12 start to open the mold, the bottle container 200 starts to freely fall due to its own weight. Here, the suction device 15 continues to suck when the first split mold 11 and the second split mold 12 start to open the mold. For this reason, the posture of the bottle container 200 is maintained before and immediately after the start of 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 inclination of the center line 300 to the third side and the fourth side in the second direction is suppressed, so that it is suppressed that the bottle container 200 contacts the split mold and gets damaged when it falls.

[0039] <Others> The embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments. Also, the effects of the present invention are not limited to those described in the above embodiments. For example, the configurations of the blow molding mechanism 1 shown in FIG. 1 are merely examples for achieving the object of the present invention and are not particularly limited.

[0040] Also, the order of the operation steps shown in FIG. 2 is merely an example and is not particularly limited. Not only the processes performed in chronological order along the order of the steps shown in FIG. 2, but also the processes may be performed in parallel or individually without necessarily being processed in chronological order. For example, in FIG. 2, it is shown that the intermediate mold and the movable mold start mold opening in step 22, and the suction device 15 of the blow molding mechanism 1 starts suction in step 23, but the order of step 22 and step 23 may be reversed. That is, the suction device 15 of the blow molding mechanism 1 may start suction before the intermediate mold and the movable mold start mold opening. Furthermore, as long as the suction device 15 of the blow molding mechanism 1 starts suction before step 24 in which the first split mold 11 and the second split mold 12 start mold opening.

[0041] Also, the operation of the bottle container 200 when the first split mold 11 and the second split mold 12 start mold opening varies depending on the suction force of the suction device 15, the shapes of the first bottom mold 13 and the second bottom mold 14, and the like. For example, by increasing the suction force of the suction device 15, it is easier to maintain the posture of the bottle container 200. Also, the timing at which the bottle container 200 starts free fall can be slightly delayed. Also, the suction force can be increased by changing the shapes of the first bottom mold 13 and the second bottom mold 14 so that the diameter of the gap 101 becomes larger. Also in this case, it is easier to maintain the posture of the bottle container 200, and the timing at which the bottle container 200 starts free fall can be slightly delayed.

[0042] In the above-described embodiment, the speeds of the operations of opening the first split mold 11 and the second split mold 12 are not particularly limited. However, the influence of the demolding force can be suppressed by slowing down the operations of opening the first split mold 11 and the second split mold 12. Further, the influence of the demolding force can also be suppressed by causing the speeds of the operations of opening the first split mold 11 and the second split mold 12 to be switched stepwise (or gradually) from a slow speed to a fast speed. In these cases, it is possible to suppress the bottle container 200 from being affected by the demolding force and having its posture disturbed. However, since the operations of opening the first split mold 11 and the second split mold 12 become slower, the overall working efficiency decreases.

[0043] Also, in the above-described embodiment, the final molded product is the bottle container 200. However, the final molded product does not have to be a bottle container. Any molded product formed by injection blow molding may be used.

[0044] Also, the blow molding mechanism 1 according to the above-described embodiment is premised on being applied to an apparatus that performs injection blow molding, which is a molding method that performs injection molding (injection molding) and blow molding (blow molding) in two steps. However, it can also be applied to an apparatus that performs only blow molding.

[0045] In the above-described embodiment, the suction device 15 starts suction before the first split mold 11 and the second split mold 12 open, but it is not limited thereto. As long as the posture of the bottle container 200 can be maintained by using some method when the first split mold 11 and the second split mold 12 open, the suction device 15 may start suction after the first split mold 11 and the second split mold 12 open. In this case, as a method for maintaining the posture of the bottle container 200, for example, a method in which another suction device (not shown) other than the suction device 15 suctions a part of the bottle container 200, a method in which the first split mold 11, the second split mold 12, or other members maintain the posture of the bottle container 200, and the like can be mentioned.

Explanation of Reference Numerals

[0046] 1... Blowing 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 part, 202... Body part, 203... Bottom part, 204... Recess, 205... Protrusion

Claims

1. A split mold that forms part of a mold used for blow molding of an intermediate molded product, closes the mold before the start of the blow molding, and opens the mold after the completion of the blow molding, and A first bottom mold that forms part of the mold and molds at least a part of the bottom on the opposite side to the mouth part where the fluid injection port in the blow molding is formed among the intermediate molded products, After the completion of the blow molding, after the split mold opens and before the final molded product, which is the result of the blow molding, separates from the first bottom mold due to a change in the posture of the final molded product, suction means for starting suction of at least a part of the bottom of the final molded product simultaneously with the opening of the split mold or before the split mold opens, characterized by having a blow molding mechanism.

2. characterized by further having a second bottom mold, a part of which is arranged in a portion penetrating in the axial direction of the intermediate molded product and molds at least a part of the bottom, The blow molding mechanism according to Claim 1.

3. The suction means is characterized by sucking at least a part of the bottom through a gap between the second bottom mold and the first bottom mold formed around the second bottom mold, The blow molding mechanism according to Claim 2.

4. The split mold includes a first split mold that molds the mouth part and a second split mold that molds a main body part, which is a part other than the mouth part and the bottom, The suction means starts the suction after the completion of the blow molding, after the first split mold and the second split mold open, and before the final molded product, which is the result of the blow molding, separates from the first bottom mold due to a change in the posture of the final molded product, simultaneously with the opening of the first split mold and the second split mold or before the first split mold and the second split mold open, The blow molding mechanism according to Claim 1.

5. An intermediate mold having a blow molding mechanism for performing blow molding on an intermediate molded product, wherein the blow molding mechanism is A split mold that forms part of a mold used for blow molding of an intermediate molded product, closes the mold before the start of the blow molding, and opens the mold after the completion of the blow molding, and A first bottom mold that forms part of the mold and molds at least a part of the bottom on the opposite side to the mouth part where the fluid injection port in the blow molding is formed among the intermediate molded products, After completion of the blow molding, after the split mold is opened and before the final molded product, which is the result of the blow molding, separates from the first bottom mold due to a change in the posture of the final molded product, suction means for starting suction of at least a part of the bottom of the final molded product simultaneously with the opening of the split mold, or before the split mold is opened; characterized by having; an intermediate mold.

6. A mold apparatus comprising a fixed-side mold, an intermediate mold having a blow molding mechanism for performing blow molding on an intermediate molded product, and a movable-side mold, wherein the blow molding mechanism of the intermediate mold comprises a split mold that forms a part of the mold used for blow molding on the intermediate molded product, closes before the start of the blow molding, and opens after the completion of the blow molding; a first bottom mold that forms a part of the mold and molds at least a part of the bottom on the opposite side of the mouth portion where the fluid injection port in the blow molding is formed in the intermediate molded product; after completion of the blow molding, after the split mold is opened and before the final molded product, which is the result of the blow molding, separates from the first bottom mold due to a change in the posture of the final molded product, suction means for starting suction of at least a part of the bottom of the final molded product simultaneously with the opening of the split mold, or before the split mold is opened; characterized by having; a mold apparatus.

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