Manufacturing methods, molds, and rotary blow molding machines for hollow containers

Abstract

A method for manufacturing a hollow container is provided, which, in a rotational blow molding process in which molten preforms are continuously supplied circumferentially to multiple sets of molds, enables the continuous molding of independently separable hollow containers. According to the present invention, a method for manufacturing a hollow container includes a rotational blow molding step, in which multiple sets of molds are configured to be connected concentrically; molten preforms are continuously supplied circumferentially to the multiple sets of molds; the multiple sets of molds are gradually closed; pressurized fluid is introduced into the preforms, causing the preforms to expand along the cavities of each mold; and the preforms are clamped by mold closing, thus independently separating the hollow containers; then the multiple sets of molds are gradually opened, and the independently separated hollow containers are removed one by one and transported to the next step.

Description

Technical Field

[0001] This invention relates to a method for manufacturing hollow containers, and more particularly to a method for manufacturing hollow containers using a rotary blow molding machine. Background Technology

[0002] (First viewpoint and second viewpoint)

[0003] Previously, there have been rotary blow molding machines for forming hollow containers. For example, the rotary blow molding mechanism of Patent Document 1 consists of multiple sets of combined molds that are radially spaced at equal intervals and connected in an arc shape, rotating in a vertical plane, providing a preform and closing the mold in a part of its circumferential direction, and opening the mold in the other parts of the circumferential direction to remove a chain of hollow molded articles in which multiple hollow containers are connected by the remaining part.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Utility Model Publication No. Sho 61-47619 Summary of the Invention

[0007] (The problem that the invention aims to solve)

[0008] (First viewpoint)

[0009] However, while forming chain-shaped hollow products using a rotary blow molding machine makes it easy to remove the chain-shaped hollow products from the machine, subsequent processes require cutting them. In other words, forming chain-shaped hollow products requires not only a rotary blow molding machine but also a cutting device.

[0010] The present invention was made in view of the following situation, and provides a method for manufacturing a hollow container, wherein a molten preform is continuously supplied along the circumferential direction to a rotary blow molding process on multiple sets of molds, which enables continuous molding of individually separable hollow containers.

[0011] (Second viewpoint)

[0012] It should be noted that in chain-like hollow molded articles formed by such rotational molding machines, the gaps between the hollow containers and the remaining portion are pinched off, forming thin-walled pinch-off portions between the hollow containers and the remaining portion. However, if the pinching is not done properly, the hollow containers and the remaining portion may be cut off, preventing the formation of chain-like hollow molded articles, or the pinch-off portions may become too thick, making them difficult to cut in subsequent separation processes.

[0013] The present invention was made in view of the following circumstances, and provides a method for manufacturing a hollow container that can be appropriately clamped during rotational blow molding.

[0014] (Technical solutions used to address the problem)

[0015] (First viewpoint)

[0016] According to the present invention, a method for manufacturing a hollow container is provided, comprising a rotational blow molding process. In the rotational blow molding process, multiple sets of molds are configured to be connected in a concentric circle. A molten preform is continuously supplied to the multiple sets of molds along the circumferential direction. The multiple sets of molds are gradually closed. Pressurized fluid is introduced into the preform, causing the preform to expand along the cavity of each mold. At the same time, the clamping part is clamped by mold closing to independently separate the hollow container. Then, the multiple sets of molds are gradually opened, and the independently separated hollow containers are taken out one by one and transported to the next process.

[0017] According to the present invention, by completely clamping the clamping part with mold closing, it is possible to continuously form independently separable hollow containers.

[0018] The following describes various embodiments of the present invention. These embodiments can be combined with each other.

[0019] Preferably, the mold comprises a first combined mold and a second combined mold, wherein the first combined mold rotates about a rotation axis relative to the second combined mold, and the rotation axis is substantially parallel to the vertical direction of the formed hollow container, thereby performing the mold closing and the mold opening.

[0020] Preferably, a fastening force strengthening device that strengthens the fastening force between the first combined mold and the second combined mold is used to clamp the clamping part during the mold closing process, thereby independently separating the hollow container.

[0021] Preferably, the aforementioned fastening force strengthening device includes a first cylinder and a second cylinder. The first cylinder has a first rod portion, which is fixed to one of the first and second combined molds and extends or retracts towards the other combined mold when the mold is closed. The second cylinder has a second rod portion, which is fixed to the other combined mold and engages with the first rod portion when the mold is closed, restricting the movement of the first rod portion in the contraction direction. When the mold is closed, with the second rod portion engaged with the first rod portion, the first rod portion retracts, thereby strengthening the fastening force of the first and second combined molds.

[0022] Preferably, the preform is a stacked preform, and the formed hollow container is a stacked peelable container. The stacked peelable container is configured to have an outer shell and an inner bag, and the inner bag shrinks as the contents are reduced.

[0023] Preferably, the positioning process for positioning the hollow container, which is independently separated through the above-mentioned rotary blow molding process, during transport involves clamping the upper and lower parts of the molded hollow container, whose body is held by the mouth-side clamp and the bottom-side clamp, thereby positioning the transported hollow container.

[0024] Preferably, the bottom-side clamp has a recess that fits into the end of the clamped portion, and the end abuts against the corner formed by the bottom surface and the side surface of the recess, thereby positioning the hollow container being transported.

[0025] Furthermore, according to the present invention, a mold is provided for molding a hollow container, wherein the mold includes a first combined mold and a second combined mold, configured such that the first combined mold and the second combined mold rotate relative to each other to perform mold closing and mold opening, and further includes a fastening force strengthening device for strengthening the fastening force of the first combined mold and the second combined mold.

[0026] Preferably, the aforementioned fastening force strengthening device includes a first cylinder, the first cylinder having a first rod portion, the first rod portion being fixed to one of the first combined mold and the second combined mold, and extending or retracting toward the other combined mold during mold closing. During mold closing, the fastening force strengthening device causes the first rod portion to retract while the engaging portion provided in the other combined mold is engaged with the first rod portion, thereby strengthening the fastening force of the first combined mold and the second combined mold.

[0027] Preferably, the aforementioned fastening force strengthening device further includes a second cylinder, which is fixed to the other combined mold and has a second rod portion. The second rod portion has the aforementioned engaging portion, which engages with the first rod portion during the mold closing process to restrict the movement of the first rod portion in the contraction direction.

[0028] Furthermore, according to the present invention, a rotary blow molding machine is provided for molding hollow containers, wherein the molds are arranged in a concentric circle connection, a molten preform is continuously supplied to the multiple sets of molds along the circumferential direction, the multiple sets of molds are gradually closed, pressurized fluid is introduced into the preform to cause the preform to expand along the cavity of each mold, and then the multiple sets of molds are gradually opened to continuously mold the hollow container.

[0029] (Second Implementation)

[0030] According to the present invention, a method for manufacturing a hollow container is provided, comprising a rotational blow molding process and a separation process. The rotational blow molding process involves arranging multiple sets of molds in a concentric circular connection, continuously supplying a molten preform to the multiple sets of molds along the circumferential direction, gradually closing the multiple sets of molds, introducing pressurized fluid into the preform to cause the preform to expand along the cavity of the mold, and then gradually opening the multiple sets of molds to continuously form a chain-like hollow molded article connected with the hollow container. The separation process is a process of independently separating the chain-like hollow molded article into hollow containers. Each of the multiple sets of molds has a means for adjusting the pressure applied to the clamping portion of the chain-like hollow molded article.

[0031] According to the present invention, since each of the multiple sets of molds has a means of bearing pressure that can adjust the pressure applied to the clamping portion of the chain-shaped hollow molded article, appropriate clamping can be performed.

[0032] The following describes various embodiments of the present invention. These embodiments can be combined with each other.

[0033] Preferably, the preform is a stacked preform, the hollow container is a stacked peeling container, the stacked peeling container is configured to have an outer shell and an inner bag, the inner bag shrinks as the contents decrease, and the clamping portion is formed at the bottom of the stacked peeling container.

[0034] Preferably, the aforementioned multiple sets of molds each have an openable and closable first combined mold and a second combined mold. The aforementioned bearing means is configured to be disposed in the first combined mold and protrude from the contact surface of the first combined mold and the second combined mold. By adjusting the amount of protrusion from the contact surface, the pressure applied to the clamping portion can be adjusted.

[0035] Preferably, the above-mentioned bearing means includes a blocking member and a gasket. The blocking member can be installed on the blocking member of the first combined mold, and the gasket is disposed between the first combined mold and the blocking member, thereby enabling adjustment of the amount of protrusion of the blocking member from the abutment surface.

[0036] Furthermore, according to the present invention, a rotary blow molding machine is provided for molding a chain-like hollow molded article connected with multiple hollow containers, wherein the machine includes multiple sets of molds arranged in a concentric circle configuration, and each of the multiple sets of molds has a means for adjusting the pressure applied to the clamping portion of the chain-like hollow molded article.

[0037] Preferably, the aforementioned multiple sets of molds each have an openable and closable first combined mold and a second combined mold. The aforementioned bearing means is configured to be disposed in the first combined mold and can protrude from the contact surface of the first combined mold and the second combined mold. The amount of protrusion from the contact surface can be adjusted, thereby adjusting the pressure applied to the clamping portion.

[0038] Preferably, the above-mentioned bearing means includes a blocking member and a gasket. The blocking member can be installed in the first combined mold, and the gasket is disposed between the first combined mold and the blocking member, thereby enabling adjustment of the amount of protrusion of the blocking member from the abutment surface. Attached Figure Description

[0039] Figure 1 (First viewpoint) is a schematic diagram showing a rotary blow molding machine 2 and a take-out device 4 according to an embodiment of the present invention.

[0040] Figure 2 It means to Figure 1 A top view of the mold 21 of the rotary blow molding machine 2 in the open state.

[0041] Figure 3 It means Figure 2 A schematic diagram of the fastening force strengthening device 30 of the mold 21.

[0042] Figure 4 middle, Figure 4 A~ Figure 4 B is a schematic diagram illustrating the operation of the fastening force strengthening device 30.

[0043] Figure 5 middle, Figure 5 A is... Figure 1 A top view of the hollow container 1 being formed by the rotary blow molding machine 2. Figure 5 B is a side view of the hollow container 1.

[0044] Figure 6 middle, Figure 6 A is a schematic top view of the rotary conveying device 6 used in the positioning process according to one embodiment of the present invention. Figure 6 B is a side view of the rotary conveyor 6.

[0045] Figure 7 middle, Figure 7 A and Figure 7 B is a schematic representation of the operation of the positioning device 8 used in the positioning process according to an embodiment of the present invention.

[0046] Figure 8 middle, Figure 8 A represents Figure 7 A and Figure 7 A diagram showing the contact surface between the mouth-side clamp 80 of the positioning device 8 (B) and the hollow container 1. Figure 8 B is a diagram showing the contact surface between the bottom side clamp 81 of the positioning device 8 and the hollow container 1.

[0047] Figure 9 yes Figure 8 A-A section view of B.

[0048] Figure 10 It means by Figure 8 A diagram illustrating the positioning of hollow container 1 by clamp 80 on the mouth side of B.

[0049] Figure 11 (Second viewpoint) is a schematic diagram showing a rotary blow molding machine 102 according to an embodiment of the present invention.

[0050] Figure 12 It means Figure 11 The unfolded view of the mold unit 121 of the rotary blow molding machine.

[0051] Figure 13 yes Figure 12 The B-B line cross-section.

[0052] Figure 14 yes Figure 12 The C-C line cross-section.

[0053] Figure 15 It means in Figure 12 The B-B line cross section is shown in the explanatory diagram of the bearing means 130.

[0054] Figure 16 This is a plan view of the gasket 133 of the bearing means 130.

[0055] Figure 17 It is an expanded representation Figure 12 An explanatory diagram of the area near the clamping portion of the first combined mold 121A of the mold unit 121.

[0056] Figure 18 middle, Figure 18 A is... Figure 11 A top view of the chain-shaped hollow molded product 110 formed by the rotary blow molding machine 102. Figure 18 B is a side view of the chain-like hollow molded article 110.

[0057] Figure 19 This is a schematic diagram illustrating the rotary separation device 104 used in the manufacturing method of the hollow container of the present invention.

[0058] Figure 20 It means Figure 18Side view of the separation unit 141 of the rotary separation device 104.

[0059] Figure 21 middle, Figure 21 A means Figure 20 A top view of the separation unit 141 before the supporting chain-like hollow molded article 110. Figure 21 B means Figure 20 A top view of the state of the separation unit 141 and the supporting chain-like hollow molded article 110. Detailed Implementation

[0060] The following describes embodiments of the present invention. The various features illustrated in the embodiments shown below can be combined with each other. Furthermore, each feature independently enables the invention to succeed.

[0061] (First viewpoint)

[0062] The method for manufacturing the hollow container 1 according to this embodiment includes a rotational blow molding process and a positioning process. In the rotational blow molding process, the hollow container 1 (refer to...) is placed from the molten preform 19... Figure 5 A and Figure 5 B) The molding process continues, and each individually separated hollow container 1 is removed. In the positioning process, the separated hollow containers 1 are positioned during transport. In the rotary blow molding process, the rotary blow molding machine 2 and the removal device 4 are mainly used (see reference). Figure 1 In the positioning process, the rotary conveyor 6 and the positioning device 8 are mainly used (see reference). Figure 6 A~ Figure 7 B).

[0063] It should be explained that, for example Figure 5 A and Figure 5 As shown in Figure B, the hollow container 1 formed in the rotational blow molding process consists of a product portion 10 and a remaining portion 15. The product portion 10 has a body portion 11, an opening portion 12, and a cap portion 13 that tapers at the front end and is continuous with the opening portion 12. Detailed description omitted, but the cap portion 13 has a flow path 14 at its front end, which is sealed by applying hot air after the positioning process. Furthermore, the cap portion 13 is cut off when the contents are filled. In this embodiment, the hollow container 1 is manufactured as a stacked peelable container, configured to have an outer shell and an inner bag, with the inner bag shrinking as the contents are reduced.

[0064] The following section will first describe the structure of the devices used in the rotary blow molding process and the positioning process, and then describe the operation of each process.

[0065] 1. Structure of each device

[0066] <Rotary Blow Molding Machine 2>

[0067] like Figure 1 As shown, the rotary blow molding machine 2 includes a rotary disk 20, multiple sets of molds 21, multiple sets of support columns 22, and an extrusion die head 23. The rotary disk 20 is rotated about a horizontal axis of rotation by a rotation drive means not shown. Figure 1 (In the middle, rotating clockwise). Multiple sets of molds 21 are configured to be connected in a concentric circle. Specifically, each mold 21 is arranged at equal intervals on the outer peripheral surface of the rotating disk 20 by support pillars 22.

[0068] Mold 21 is a modular mold, such as... Figure 2 As shown, the device includes a first combined mold 21A (one combined mold) and a second combined mold 21B (another combined mold) that can be opened and closed. The first combined mold 21A is located on the inner side of the concentric circle, i.e., on the side of the rotating disk 20, and the second combined mold 21B is located on the outer side of the concentric circle, i.e., on the outer side of the first combined mold 21A.

[0069] Furthermore, mold 21 is so-called book-shaped, with the first combined mold 21A and the second combined mold 21B rotating around the axis 21x (see reference). Figure 3 The relative rotation allows for mold closing and opening. It should be noted that in this embodiment, the rotation axis 21x is configured to be approximately parallel to the vertical direction of the molded hollow container 1, i.e., along the circumferential direction of the rotating disk 20.

[0070] The first combined mold 21A and the second combined mold 21B each have a cavity 24. Furthermore, the first combined mold 21A and the second combined mold 21B each have an inlet groove 25 for introducing pressurized fluid into the cavity 24. Figure 2 The part with the applied shadow line is the contact surface S1 and the contact surface S2 of the first combined mold 21A and the second combined mold 21B when they are closed.

[0071] The cavity 24 includes a container forming section 26 for forming the product section 10 (main body 11, opening 12, and cap 13) of the hollow container 1, a residual part forming section 27 for forming the residual part 15, and a flow path forming section 28 for forming the flow path 14 at the front end of the cap 13. The residual part forming section 27 includes a blow-in section forming section 27a for forming the blow-in section 15a and a connecting section forming section 27b for forming the connecting section 15b. In this embodiment, each mold 21 of the rotary blow molding machine 2 is formed with one container forming section 26 and one residual part forming section 27. The container forming section 26 and the residual part forming section 27 are arranged with a clamping section forming section 29 between them.

[0072] It should be noted that in this embodiment, the rotary blow molding machine 2 closes the mold using the clamping part forming part 29, thereby clamping off the clamping part and separating the bottom 16 of the hollow container 1 from the adjacent remaining part 15. For example... Figure 5A and Figure 6 As shown in Figure B, a bottom-side clamping portion 17 is formed on the bottom 16 of the separated hollow container 1. The bottom-side clamping portion 17 serves as a portion that seals the bottom 16 of the hollow container 1. Furthermore, a remaining portion-side clamping portion 18 is formed at the end of the separated remaining portion 15, at the position where it is cut off from the bottom-side clamping portion 17.

[0073] like Figure 5 A and Figure 5 As shown in Figure B, the hollow container 1 formed by the rotary blow molding machine 2 with the above-described structure consists of a product section 10 and a remaining section 15. The remaining section 15 consists of a blow-in section 15a and a connecting section 15b. The blow-in section 15a is the part into which pressurized fluid for blow molding is blown in. The blow-in section 15a is generally rectangular in shape and pierces the blow-in nozzle from the side, thereby allowing the pressurized fluid flowing to the flow path 14 of the adjacent product section 10 to pass through. The connecting section 15b is the burr formed between the blow-in section 15a and the adjacent hollow container 1, which is separated by mold closing. In the manufacturing method of this embodiment, the pressurized fluid is blown in through the blow-in section 15a, which is removed in a subsequent process, separating the blow-in space from the space of the hollow container 1, thus preventing foreign objects from entering the interior of the hollow container 1.

[0074] In addition, such as Figure 2 As shown, the mold 21 in this embodiment includes a fastening force strengthening device 30. The fastening force strengthening device 30 is a device that strengthens the fastening force between the first combined mold 21A and the second combined mold 21B, such as... Figure 3 As shown, the device includes a first cylinder 31 and a second cylinder 33. The first cylinder 31 and the second cylinder 33 are respectively disposed on the side opposite to the rotation axis 21x, moving closer to each other when the mold is closed and moving further apart when the mold is opened. In this embodiment, the first cylinder 31 and the second cylinder 33 are electrically powered cylinders. However, other power sources can be used as long as linear movement is required.

[0075] like Figure 2 as well as Figure 3 As shown, the first cylinder 31 includes a first cylindrical portion 31a and a first rod portion 31b. The first cylinder 31 is fixed to the first assembly mold 21A by a fixing member 32. The first cylindrical portion 31a is configured to be supported by the fixing member 32, and the first rod portion 31b is configured to be telescopic relative to the first cylindrical portion 31a. Furthermore, the first rod portion 31b has an expanded diameter portion 31c at its front end. Figure 2 As shown, the first cylinder 31 is fixed by extending and retracting the first rod portion 31b along a direction perpendicular to the contact surface S1 of the first combined mold 21A. Therefore, the first rod portion 31b of the first cylinder 31 extends and retracts toward the second combined mold 21B when the mold is closed.

[0076] The second cylinder 33 includes a second cylindrical portion 33a and a second rod portion 33b. The second cylinder 33 is fixed to the second assembly mold 21B by a fixing member 34. The second cylindrical portion 33a is supported by the fixing member 34, and the second rod portion 33b is configured to be telescopic relative to the second cylindrical portion 33a. Furthermore, the second rod portion 33b has a U-shaped engaging portion 33c at its front end that can engage with the bulge portion 31c of the first rod portion 31b (see reference). Figure 2 It should be noted that as long as the expanded diameter portion 31c of the first rod portion 31b and the engaging portion 33c of the second rod portion 33b can engage with each other, they can each be of any shape.

[0077] The second cylinder 33 is supported by the fixing member 34 in a state where it is lifted outward from the side of the second assembly mold 21B. The second cylinder 33 is fixed to the second assembly mold 21B in such a way that the second rod portion 33b extends and retracts in a direction perpendicular to the side of the second assembly mold 21B, or more specifically, in such a way that it can extend toward the side of the second assembly mold 21B.

[0078] <Removal Device 4>

[0079] like Figure 1 As shown, the removal device 4 removes the hollow container 1 formed by the rotary blow molding machine 2 from the mold 21 and transfers it to the next process device. The removal device 4 includes a rotating disk 40 that rotates around a horizontal rotation axis using a rotation drive means (not shown), and a plurality of suction means 41 arranged at equal intervals on the outer peripheral surface of the rotating disk 40. It should be noted that the rotating disk 40 rotates in the opposite direction to the rotating disk 20 of the rotary blow molding machine 2, that is, counterclockwise.

[0080] The adsorption means 41 includes a base 41a and two adsorption nozzles 41b extending radially outward from the base 41a. After molding using the rotary blow molding machine 2, each adsorption means 41 draws the hollow container 1, which is placed on the first combined mold 21A, from the mold 21 using the two adsorption nozzles 41b, thereby removing the hollow container 1 from the mold 21. The removed hollow container 1 is then conveyed along the outer periphery of the rotary disk 40 to the next process.

[0081] It should be noted that, in order to facilitate the removal of the hollow container 1 from the first combined mold 21A using the adsorption means 41, the first combined mold 21A may also be equipped with a means for removing the formed hollow container 1 from the cavity 24 (see reference). Figure 2 The floating take-off lever (not shown).

[0082] <Rotary Conveying Device 6>

[0083] like Figure 6 A and Figure 6As shown in Figure B, the rotary conveying device 6 includes a rotary disk 60 rotated by a driving means (not shown) and multiple clamping means 61 for clamping the hollow container 1. The rotary disk 60 is rotated by a rotary driving means (not shown) about a vertical rotation axis (in the direction of rotation). Figure 6 (rotated clockwise in A1).

[0084] Each clamping means 61 has a pair of clamping members 61a that can be opened and closed. By shortening the distance between the pair of clamping members 61a, the hollow container 1 is clamped. By increasing the distance between the pair of clamping members 61a at a position opposite to the clamping position on the rotary table 60, the hollow container 1 is conveyed to the next process.

[0085] <Positioning Device 8>

[0086] In this embodiment, the positioning device 8 and the rotary conveying device 6 are used simultaneously. For example... Figure 7 A and Figure 7 As shown in Figure B, the positioning device 8 includes a mouth-side clamp 80 and a bottom-side clamp 81. The positioning device 8 uses the clamping means 61 of the rotary conveying device 6 to clamp the upper and lower parts of the molded hollow container 1, which is held by the mouth-side clamp 80 and the bottom-side clamp 81, thereby positioning the hollow container 1 being conveyed by the rotary conveying device 6.

[0087] The mouth-side clamp 80 abuts against the remaining portion 15 of the hollow container 1, correcting any positional deviation of the hollow container 1. For example... Figure 8 As shown in Figure A, the contact surface between the mouth-side clamp 80 and the hollow container 1 is formed with a recess 80a for fitting the remaining portion 15. Figure 9 As shown, the inner surface of the recess 80a has an inclined surface 80b and an inclined surface 80c that slope towards the hollow container 1. Furthermore, the connection between the bottom surface 80d of the recess 80a and one of the inclined surfaces 80b is a corner portion 80e extending along the long side of the recess 80a. Additionally, during the positioning process, the front end of the remaining portion 15 (the remaining portion-side clamping portion 18) abuts against the corner portion 80e (see reference). Figure 10 ).

[0088] The bottom clamp 81 abuts against the bottom 16 of the hollow container 1, correcting any positional deviation of the hollow container 1. For example... Figure 8 As shown in Figure A, the contact surface between the bottom side clamp 81 and the hollow container 1 is a flat surface 81a.

[0089] Next, the manufacturing method of the hollow container 1 using the above-mentioned devices will be explained, especially the operation of the rotational blow molding process and the positioning process.

[0090] 2. Manufacturing method

[0091] <Rotational blow molding process>

[0092] When the hollow container 1 is formed by the rotary blow molding machine 2, firstly, the molten preform 19 extruded from the extrusion die 23 is continuously supplied along the circumferential direction to each die 21. In this embodiment, since the hollow container 1 is a stacked peelable container, the preform 19 extruded from the extrusion die 23 is a stacked preform. Next, the die 21 is gradually closed, and pressurized fluid is introduced into the preform 19, causing the preform 19 to expand along the cavity 24 of the die 21. Thus, the preform 19 expands along the cavity 24, and the hollow container 1 and the remaining part 15 are formed by the container forming part 26 and the remaining part forming part 27.

[0093] It should be noted that in the rotary blow molding machine 2 of this embodiment, the pressurized fluid introduced into the residual portion forming section 27 of one mold 21 does not flow to the container forming section 26 of the same mold 21, but is blown into the container forming section 26 of the adjacent rear mold 21 through the flow path forming section 28. However, it is also possible to configure a hollow container 1 and the residual portion 15 to be connected within one mold 21.

[0094] Furthermore, in the rotary blow molding process of this embodiment, after the mold 21 is gradually closed, the preform 19 expands along the cavity 24, and at the same time, the mold is closed to clamp the clamping part, thus independently separating the hollow container 1. In addition, by independently separating the hollow container 1 through mold closing, the rotary blow molding machine 2 of this embodiment is equipped with a fastening force strengthening device 30.

[0095] like Figure 4 A and Figure 4 As shown in Figure B, during mold closing, the fastening force strengthening device 30 extends the second rod portion 33b, causing the expanded diameter portion 31c of the first rod portion 31b to engage with the engaging portion 33c of the second rod portion 33b. This restricts the movement of the first rod portion 31b in the contraction direction. Furthermore, the fastening force strengthening device 30 in this… Figure 4 In state B, the first rod portion 31b is contracted. As a result, the second combined mold 21B, to which the second rod portion 33b (second cylinder 33) is fixed, is pulled toward the first combined mold 21A, to which the first rod portion 31b (first cylinder 31) is fixed. With this structure, the fastening force strengthening device 30 of this embodiment strengthens the fastening force of the first combined mold 21A and the second combined mold 21B. With this structure of the fastening force strengthening device 30, the mold 21 of this embodiment utilizes the clamping portion forming portion 29 (see reference...) Figure 2 Completely clamp the blank 19, independently separate the hollow container 1, and remove it independently.

[0096] Therefore, the molds 21 that have been closed then open sequentially to continuously form the independently separable hollow containers 1. For example... Figure 1As shown, the independently separated hollow containers 1 are sequentially adsorbed by the adsorption nozzles 41b of the removal device 4, and removed from the mold 21. The hollow containers 1 removed from the mold 21 are moved along the outer periphery of the rotating disk 40 and transported to the next process.

[0097] <Positioning Process>

[0098] The positioning process is the process of positioning the hollow container 1, which has been independently separated through the rotary blow molding process, for subsequent transport. In the positioning process, such as... Figure 7 A and Figure 7 As shown in Figure B, the hollow container 1 is first held by the rotary conveying device 6. In addition, in this state, the opening-side clamp 80 and the bottom-side clamp 81 of the positioning device 8 clamp the hollow container 1, thereby positioning the hollow container 1.

[0099] Specifically, for the mouth-side clamp 80, since the front end of the remaining portion 15 of the hollow container 1 is a flat remaining portion-side clamping portion 18, therefore, as Figure 10 As shown, the remaining portion side clamp 18 abuts against the corner portion 80e, thereby correcting the tilt of the hollow container 1 and the deviation caused by rotation around the central axis. Furthermore, the recess 80a of the mouth-side clamp 80 has inclined surfaces 80b and 80c, thus guiding the front end of the remaining portion 15 when the mouth-side clamp 80 approaches the remaining portion 15. Additionally, when the mouth-side clamp 80 abuts against the hollow container 1, the blowing portion 15a of the remaining portion 15 abuts against the inclined surface 80b, thereby stably positioning the hollow container 1 even if the remaining portion 15 is tilted.

[0100] On the other hand, for the bottom-side clamp 81, the bottom 16 of the hollow container 1 has a continuous placement surface 16a along the circumferential direction, allowing the container to be placed upright (see reference). Figure 5 A and Figure 5 (B) Therefore, the placement surface abuts against the flat surface 81a, thereby correcting the tilt of the hollow container 1.

[0101] It should be noted that the clamping force of the hollow container 1 by the clamping member 61a is not large, and the clamping member 61a is made of a slippery material (with a low coefficient of friction). Therefore, when positioning using the positioning device 8, the clamping means 61 can maintain the state of clamping the hollow container 1 while performing positioning.

[0102] It should be noted that in this embodiment, the extraction device 4 can be adjacent to the rotary conveying device 6, or other conveying devices can be provided between them. That is, a process of conveying the formed hollow container 1 can also be appropriately added between the rotary blow molding process and the positioning process.

[0103] 3. Effects

[0104] Thus, in the manufacturing method of the hollow container 1 in this embodiment, the mold 21 is equipped with a fastening force strengthening device 30, thereby strengthening the fastening force of the first combined mold 21A and the second combined mold 21B. Furthermore, through this manufacturing method, the bottom-side clamping portion 17 and the remaining portion-side clamping portion 18 are completely clamped together by mold closing, thereby enabling the continuous molding of independently separable hollow containers 1. Therefore, there is no need to introduce any cutting device other than a rotary blow molding machine. Moreover, the hollow container 1 of this embodiment is a stacked peelable container, completely clamped and independently separated within the mold 21, thereby suppressing the peeling (breaking) of the bottom 16 (bottom-side clamping portion 17) compared to the case where the chain-like hollow molded product is cut off through post-processing.

[0105] Furthermore, when the hollow container 1 is separated independently in the rotary blow molding machine 2, the position of the hollow container 1 is prone to deviate during the subsequent transport. However, in the manufacturing method of the hollow container 1 in this embodiment, a positioning process is provided to position the separated hollow container 1 during transport. This allows the decrease in processing accuracy caused by position deviation to be suppressed in subsequent processes, such as the burr removal process, the sealing process of the bottom side clamping part 17, and the formation process of the air inlet hole.

[0106] 4. Variations

[0107] In the above embodiment, the bottom-side clamping portion 17 and the remaining-side clamping portion 18 are completely clamped off by mold closing, thereby forming an independently separable hollow container 1 in the rotary blow molding machine 2. However, in the rotary blow molding machine, the hollow container 1 may not be clamped off independently, and a chain-like hollow molded article may be formed, which is then cut off by another device. In this case, by equipping the mold 21 with a clamping force strengthening device 30, the clamping force of the mold 21 can be stabilized.

[0108] • In the above embodiments, a positioning step is performed after the rotational blow molding process, but the positioning step is not mandatory. For example, when molding a chain-like hollow molded article as described above, it is difficult for positional deviation to occur during transport, so the positioning step can be omitted.

[0109] In the above embodiments, the hollow container 1 is a stacked and peeled container. However, the hollow container 1 manufactured by the present invention can be a non-peeled multi-layer container, or it can be a single-layer container.

[0110] In the above embodiment, the first cylinder 31 is fixed to the first combined mold 21A, and the second cylinder 33 is fixed to the second combined mold 21B. However, it is also possible to fix the first cylinder 31 to the second combined mold 21B and the second cylinder 33 to the first combined mold 21A. That is, the first cylinder 31, which extends and retracts toward the opposing combined mold, can be placed on the outer side of the second combined mold 21B, instead of the first combined mold 21A on the side of the rotating disk 20.

[0111] • As a fastening force strengthening device 30, other means such as an elastomer or an electromagnet can be used instead of the first cylinder 31 and the second cylinder 33 described above.

[0112] (Second viewpoint)

[0113] The method for manufacturing the hollow container 101 according to the embodiments of the present invention comprises comprising: Figure 11 The rotary blow molding process of the rotary blow molding machine 102 shown is performed by... Figure 19 The separation process of the rotary separation device 104 shown. The rotary blow molding machine 102 performs the separation process. Figure 18 A and Figure 18 The chain-shaped hollow molded article 110 shown in B is molded, and the chain-shaped hollow molded article 110 is separated into independent hollow containers 101 by the rotary separation device 104, thereby manufacturing the hollow container 101.

[0114] It should be explained that, for example Figure 18 A and Figure 18 As shown in Figure B, the chain-like hollow molded article 110 is formed by alternately connecting multiple hollow containers 101 with the remaining portion 115. Furthermore, the hollow container 101 manufactured by the manufacturing method of this embodiment is manufactured as a stacked peelable container, which is configured to have an outer shell and an inner bag, with the inner bag shrinking as the contents are reduced. The hollow container 101 includes a main body portion 111, an opening portion 112, and a cap portion 113 that tapers at the front end and is continuous with the opening portion 112. Detailed description omitted, but the cap portion 113 has a flow path 114 at its front end, which is sealed by applying hot air after the separation process. Furthermore, the cap portion 113 is cut off during the filling of the contents.

[0115] The structure of each device will be explained first, followed by the method for manufacturing the hollow container 101 using these devices.

[0116] <Structure of Rotary Blow Molding Machine 102>

[0117] like Figure 11 As shown, the rotary blow molding machine 102 includes a rotary disk 120, multiple mold units 121, multiple support columns 122, and an extrusion die head 123. The rotary disk 120 is rotated about a horizontal axis of rotation by a rotation drive means (not shown). Figure 11 (Rotating clockwise). Multiple mold units 121 are configured to be connected in a concentric circle. Specifically, each mold unit 121 is arranged at equal intervals on the outer peripheral surface of the rotating disk 120 by support columns 122.

[0118] Mold unit 121 is a segmented mold, such as Figure 12 As shown, the device includes a first combined mold 121A and a second combined mold 121B that can be opened and closed. The first combined mold 121A is disposed on the inner side of the concentric circle, i.e., on the side of the rotating disk 120, and the second combined mold 121B is disposed on the outer side of the concentric circle, i.e., on the outer side of the first combined mold 121A.

[0119] like Figure 12 as well as Figure 13 As shown, the first combined mold 121A and the second combined mold 121B each have a cavity 124. Furthermore, as... Figure 12 As shown, the first combined mold 121A and the second combined mold 121B each have an inlet groove 125 for introducing pressurized fluid into the cavity 124. Wherein, Figure 12 The parts with the shading applied are the contact surfaces S1 and S2 of the first mold assembly 121A and the second mold assembly 121B when they abut during mold closing (also refer to...). Figure 13 as well as Figure 14 ).

[0120] The cavity 124 includes a container forming section 126 that forms the main body 111, opening 112, and cover 113 of the hollow container 101; a residual section forming section 127 that forms the remaining section 115; and a flow path forming section 128 that forms the flow path 114 at the front end of the cover 113. The residual section forming section 127 includes a blow-in section forming section 127a that forms the blow-in section 115a and a connecting section forming section 127b that forms the connecting section 115b. In this embodiment, each mold unit 121 of the rotary blow molding machine 102 has one container forming section 126 and one residual section forming section 127. The container forming section 126 and the residual section forming section 127 are arranged across the clamping section forming section 129 that forms the clamping section 116. The clamping section 116 is formed at the bottom of the hollow container 101 and is the part that seals the bottom of the hollow container 101.

[0121] And, as Figure 12 , Figure 14 , Figure 15 as well as Figure 17 As shown, the first combined mold 121A of the mold unit 121 in this embodiment includes a pair of bearing means 130 and a recess 131 provided in the pair of bearing means 130. The bearing means 130 are used to adjust the pressure applied to the clamping portion 116 of the chain-shaped hollow molded article 110 (hollow container 101).

[0122] The bearing means 130 is configured to protrude from the contact surface S1 of the first combined mold 121A and the second combined mold 121B, and the amount of protrusion from the contact surface S1 can be adjusted, thereby adjusting the pressure applied to the clamping portion 116. For example... Figure 15 As shown, the bearing means 130 includes a blocking member 132, a washer 133, and a screw 134 as a fixing member.

[0123] like Figure 15 as well as Figure 17 As shown, the blocking component 132 is cuboid in shape. In the top view, the blocking component 132 has a screw hole 132a, which can be installed to the first assembly mold 121A by screws 134.

[0124] like Figure 16 As shown, the shim 133 is a disc-shaped material with a through hole 133a, the thickness of which is, for example, 0.01 mm. Furthermore, the through hole 133a allows the screw hole 132a to be inserted. Figure 15 As shown, in the recess 131 of the first combined mold 121A, the gasket 133 is disposed between the first combined mold 121A and the blocking member 132.

[0125] Another aspect, such as Figure 17 As shown, the recess 131 of the first combined mold 121A is provided near the clamping portion forming portion 129. Specifically, the recess 131 is provided on both sides of the connecting portion forming portion 127b. By arranging the recess 131 in such a position, the bearing means 130 is also arranged near the clamping portion forming portion 129.

[0126] like Figure 15 As shown, since the blocking member 132 is inserted into the recess 131, the top view shows a rectangular shape corresponding to the shape of the blocking member 132. Furthermore, the bottom surface of the recess 131 has a screw hole 131a for screwing in the screw 134. A predetermined number of washers 133 and the blocking member 132 are sequentially arranged within the recess 131, and the screw 134 is screwed into the screw hole 131a, thereby securing the blocking member 132.

[0127] And, as Figure 17 As shown, in this embodiment, the recess 131 is configured to be connected to the segments 121A1 formed on both sides of the cavity 124 of the first assembly mold 121A (see also...). Figure 13 In other words, the recess 131 is formed to be continuous with the segment 121A1. With this structure, the addition and removal of the gasket 133 can be easily performed.

[0128] The bearing means 130 with such a structure allows the blocking member 132 to protrude slightly from the abutment surface S1 of the first combined mold 121A. When the mold is closed, the blocking member 132 can abut against the abutment surface S2 of the second combined mold 121B, creating a small gap in the clamping part forming part 129. Furthermore, in this embodiment, the bearing means 130 adjusts the amount of protrusion from the abutment surface S1 of the blocking member 132 by adjusting the number of shims 133 disposed between the first combined mold 121A and the blocking member 132.

[0129] like Figure 18 A and Figure 18 B. The chain-shaped hollow molded article 110 formed by the rotary blow molding machine 102 with the above-described structure has multiple hollow containers 101 and residual portions 115 (burrs) alternately connected. The residual portions 115 are composed of a blow-in section 115a and a connecting section 115b. The blow-in section 115a is the part where pressurized fluid for blow molding is blown in. The blow-in section 115a is generally cuboid in shape and pierces the blow-in nozzle from the side, thereby causing the pressurized fluid to flow to an adjacent hollow container 101 (in Figure 18 A and Figure 18 B is the flow path 114 on the right side. The connecting part 115b connects to the blowing part 115a and another hollow container 101 (in...). Figure 18 A and Figure 18 B is the left side) connection. In the manufacturing method of this embodiment, pressurized fluid is blown in through the blow-in section 115a, which is removed in a subsequent process, and the blow-in space is separated from the space of the hollow container 101, so that foreign objects can be prevented from entering the interior of the hollow container 101.

[0130] <Structure of the Rotary Separation Device 104>

[0131] Next, as Figure 19 As shown, the rotary separation device 104 includes a rotary disk 140 that rotates about a horizontal rotation axis by a rotary drive means (not shown), and a plurality of separation units 141 arranged at equal intervals on the outer peripheral surface of the rotary disk 140. Here, in Figure 19 In the process, the rotating disk 140 rotates counterclockwise. The rotating separation device 104 is configured such that multiple separation units 141 sequentially cut off the remaining portion 115 connecting adjacent hollow containers 101 in the chain-shaped hollow molded article 110 to separate the hollow containers 101, and then transport them to the next process at a designated rotating position.

[0132] like Figure 20 , Figure 21 A and Figure 21 As shown in B, the separation unit 141 includes a lower holding platform 142, a cover holding platform 143, a main body clamping member 144, a cutting member 145, a remaining part pressing mechanism 146, and a cover pressing mechanism 147.

[0133] The lower holding platform 142 holds the lower part of the main body 111 of the hollow container 101, and includes a mounting part 142a for placing the lower end of the hollow container 101 and an adsorption means 142b for vacuum adsorption of the hollow container 101. The lower holding platform 142 is configured to move upward when the hollow container 101 is sent to the next process.

[0134] The cover retaining platform 143 is positioned in front of the lower retaining platform 142. Figure 20 , Figure 21 A and Figure 21 (B on the left) is a component that holds the lid 113 of the hollow container 101 by an upwardly extending protrusion 143a.

[0135] The main body clamping member 144 includes plate-shaped members 144a disposed on the cover retaining platform 143 and a pair of clamping pieces 144b extending upward from each plate-shaped member 144a. The main body clamping member 144 is a member that clamps the side of the main body 111 by the pair of clamping pieces 144b. Figure 21 The non-clamping position shown in A is... Figure 21 Movement between the clamping positions shown in B.

[0136] Cutting component 145 is a plate-shaped component that cuts off the flow path 114 at the front end of the hollow container 101, such as... Figure 20 As shown, the upper end face of the device has a cutting portion 145a that cuts off the flow path 114 connecting the cover portion 113 of the hollow container 101 and the remaining portion 115. The cutting member 145 is configured to move upward by a driving means (not shown), thereby cutting off the flow path 114 and simultaneously lifting the remaining portion 115.

[0137] The remaining part pressing mechanism 146 is located above the remaining part 115 and is a mechanism that restricts movement upwards toward the remaining part 115, such as... Figure 20 , Figure 21 A and Figure 21 As shown in Figure B, the device includes a base 146a, a support column 146b, an arm 146c, and a pressing member 146d. In this embodiment, the base 146a is configured to be disposed to the side of the cover holding platform 143, and the support column 146b is configured to extend upward from the base 146a. The base end of the arm 146c is axially supported at the upper part of the support column 146b, and is a member extending forward, forming an L-shape in plan view, so that its front end is located above the remaining portion 115. The pressing member 146d is mounted on the front end of the arm 146c and is a member that holds the remaining portion 115 and restricts upward movement. Figure 15 As shown, the pressing component 146d is shaped like a "ko" in the side view in order to hold the front and rear ends of the blowing part 115a.

[0138] In the remaining pressing mechanism 146 configured as described above, the arm 146c is rotated relative to the support column 146b by a driving means (not shown), thereby enabling the pressing member 146d to... Figure 21 The non-suppression position shown in A is... Figure 21 Move between the suppression positions shown in B.

[0139] like Figure 20 , Figure 21 A and Figure 21 As shown in Figure B, the lid pressing mechanism 147 is located above the lid 113 of the hollow container 101 and is a mechanism that restricts the upward movement of the lid 113. Figure 21 A and Figure 21 As shown in Figure B, the cover pressing mechanism 147 includes a cylindrical pressing pin 147a extending laterally and a cuboid-shaped drive member 147b that holds the pressing pin 147a. Driving the drive member 147b allows the pressing pin 147a to be pressed... Figure 21 The non-suppression position shown in A is... Figure 21 Move between the suppression positions shown in B.

[0140] Next, a method for manufacturing the hollow container 101 using the above-described apparatus will be described. In this embodiment, the method for manufacturing the hollow container 101 includes a blow molding process and a separation process.

[0141] <Blow Molding Process>

[0142] When the chain-shaped hollow molded article 110 is formed by the rotary blow molding machine 102, firstly, the molten preform 119 extruded from the extrusion die 123 is continuously supplied along the circumferential direction to the molds of each mold unit 121. In this embodiment, since the hollow container 101 manufactured is a stacked peelable container, the preform 119 extruded from the extrusion die 123 is a stacked preform. Next, the mold units 121 are closed, and pressurized fluid is introduced into the preform 119, causing the preform 119 to expand against the cavity 124 of the mold unit 121. In this way, the preform 119 expands along the cavity 124, and the hollow container 101 and the remaining part 115 are formed by the container forming part 126 and the remaining part forming part 127.

[0143] Here, in the rotary blow molding machine 102 of this embodiment, the pressurized fluid introduced into the remaining portion forming section 127 of one mold unit 121 does not flow into the container forming section 126 of the same mold unit 121, but is blown into the container forming section 126 of the adjacent rear mold unit 121 through the flow path forming section 128 of the adjacent rear mold unit 121. However, it is also possible to configure a hollow container 101 and the remaining portion 115 to be connected within one mold unit 121.

[0144] Next, each mold unit 121 opens sequentially, thereby continuously forming a chain-like hollow molded product 110 connected with the hollow container 101.

[0145] The chain-shaped hollow molded article 110, conveyed from the rotary blow molding machine 102, is transported via a conveyor path (not shown) to the rotary separation device 104, and then moved to the separation process. This structure prevents the chain-shaped hollow molded article 110 from separating during conveying.

[0146] It should be noted that the chain-shaped hollow molded articles 110 conveyed from the rotary blow molding machine 102 first pass through a conveyor path and then enter the rotary separator 104. This reduces the vibration (uniformity) of the chain-shaped hollow molded articles 110 conveyed to the rotary separator 104, ensuring that each hollow container 101 is precisely positioned in each separation unit 141 of the rotary separator 104. Furthermore, conveying the chain-shaped hollow molded articles 110 along the conveyor path allows for cooling after blow molding. Cooling the chain-shaped hollow molded articles 110 facilitates the separation of the remaining portion 115 during the next separation process.

[0147] <Separation Process>

[0148] In the separation process, make Figure 19 The rotating disk 140 of the rotary separation device 104 shown rotates, causing each hollow container 101 of the chain-like hollow molded article 110 conveyed from the rotary blow molding machine 102 to be positioned in the separation unit 141. At this time, the lower part of the main body 111 of the hollow container 101 is positioned as shown in the figure. Figure 20 The cover portion 113 is placed on the cover portion holding platform 142 shown. Next, the adsorption means 142b adsorbs the main body portion 111 of the hollow container 101, causing the main body portion clamping member 144 to... Figure 21 The non-clamping position shown in A is moved to... Figure 21 The clamping position shown in B secures the hollow container 101 to the separation unit 141.

[0149] Next, as Figure 21 A and Figure 21 As shown in Figure B, the pressing member 146d of the remaining portion pressing mechanism 146 is moved from the non-pressing position to the pressing position, and the pressing pin 147a of the cover pressing mechanism 147 is also moved from the non-pressing position to the pressing position. Furthermore, in this state, the cutting member 145 is moved upwards. As a result, the flow path 114 at the front end of the hollow container 101 is cut off. It should be noted that the clamping portion 116 and the connecting portion 115b of the front hollow container 101 are torn apart by the pressing member 146d pressing against the connecting portion 115b, separating the front hollow container 101 from the remaining portion 115 (see Figure B). Figure 20 ).

[0150] For the remaining hollow container 101 separated from part 115, the pressing pin 147a is moved to a non-pressing position, the lower holding platform 142 is raised and lifted, the adsorption means 142b is released, and the hollow container 101 is sent to the next process by the rotation of the rotating disk 140. In the separation process, the rotating separation device 104 separates the chain-shaped hollow molded product 110 independently through the above actions.

[0151] It should be noted that the hollow container 101, separated by the separation process, will be sealed through the flow path 114 at the front end of the hot air cover 113 in the next process. Furthermore, an external air inlet is formed on the outer shell of the hollow container 101, and a valve component is installed in this external air inlet. The processes following these separation processes are omitted from description as conventional manufacturing methods can be used.

[0152] <Effects>

[0153] As described above, in the manufacturing method of the hollow container 101 of this embodiment, the first combined mold 121A of the multiple mold units 121 of the rotary blow molding machine 102 is equipped with a bearing means 130. Furthermore, the bearing means 130 causes the blocking member 132 to protrude slightly from the abutment surface S1 of the first combined mold 121A, thereby creating a small gap in the clamping portion forming portion 129 when the mold is closed, reducing the pressure applied to the clamping portion 116 of the chain-shaped hollow molded article 110. Moreover, the bearing means 130 can adjust the number of gaskets 133 disposed between the first combined mold 121A and the blocking member 132. Therefore, in the manufacturing method of the hollow container 101 of this embodiment, by adjusting the amount of protrusion from the abutment surface S1 of the blocking member 132, the pressure applied to the clamping portion 116 can be adjusted. In addition, by adjusting the pressure applied to the clamping portion 116, the hollow container 101 and the remaining portion 115 are cut off during the separation process, or the clamping portion 116 becomes too thick, thereby preventing the problem of difficulty in cutting off in subsequent separation processes.

[0154] It should be noted that the location of the bearing means 130 is preferably near the clamping part forming part 129, and particularly preferably at the end of the first combined mold 121A that does not overlap with the cavity 124. If the bearing means 130 is provided on the side of the cavity 124, the second combined mold 121B will float in that part, which may cause defects such as streaks to appear in the formed hollow container 101. Therefore, it is arranged on both sides of the connecting part forming part 127b that does not overlap with the cavity 124, thereby preventing adverse effects on the hollow container 101.

[0155] Furthermore, in this embodiment, the manufactured hollow container 101 has an outer shell and an inner bag, and is a laminated peelable container where the inner bag shrinks as the contents decrease. Here, the inner bag of the laminated peelable container is clamped at its clamping portion 116, and the inner bag shrinks appropriately when it shrinks. In addition, when clamped by the closed mold, the laminated peelable container and the outer shell at the clamping portion 116 are fused together, thereby improving impact resistance; however, if the clamping is not performed properly, rupture may occur at the clamping portion 116. In this regard, in the manufacturing method of this embodiment, since the pressure applied to the clamping portion 116 can be adjusted by the bearing means 130, rupture at the clamping portion 116 can be suppressed.

[0156] It should be noted that the present invention can also be implemented in the following ways.

[0157] In the above embodiments, the hollow container 101 is a stacked and peeled container. However, the hollow container manufactured by the present invention can also be a non-peeled multi-layer container, or it can be a single-layer container.

[0158] • In the above embodiments, the chain-shaped hollow molded article 110 is separated using a rotary separation device 104, but the chain-shaped hollow molded article 110 can also be separated by other devices or methods.

[0159] • In the above-described embodiments, the bearing means 130 is disposed in the first combined mold 121A, which serves as the inner mold, but it may also be disposed in the second combined mold 121B, which serves as the outer mold.

[0160] In the above embodiment, the thickness of the gasket 133 of the bearing means 130 is 0.01 mm, but different thicknesses may be used depending on the shape and material of the hollow container being manufactured.

[0161] In the above-described embodiment, the bearing means 130 includes a blocking member 132 and a gasket 133, but the pressure applied to the clamping portion 116 can also be adjusted using other structures. For example, as the bearing means 130, a thin plate-shaped component that can be directly attached to the mold can also be used. In this case, by repeatedly attaching multiple thin plate-shaped components, or by preparing multiple thin plate-shaped components of different thicknesses, the pressure applied to the clamping portion 116 can be adjusted.

[0162] (Symbol Explanation)

[0163] 1: Hollow container; 2: Rotary blow molding machine; 4: Take-out device; 6: Rotary conveying device; 8: Positioning device; 10: Product section; 11: Main body section; 12: Opening; 13: Cover section; 14: Flow path; 15: Remaining part; 15a: Blow-in section; 15b: Connecting part; 16: Bottom; 16a: Placement surface; 17: Bottom side clamping part; 18: Remaining part side clamping part; 19: Parison; 20: Rotary disk; 21: Mold; 21A: First combination mold; 21B: Second combination mold; 21x: Rotating shaft; 22: Support column; 23: Extrusion die head; 24: Cavity; 25: Inlet groove; 26: Container forming section; 27: Remaining part forming section; 27a: Blow-in section forming section; 27b: Connecting part forming section; 28: Flow path. 29: Clamping part forming part; 30: Fastening force strengthening device; 31: First cylinder; 31a: First cylinder part; 31b: First rod part; 31c: Expansion part; 32: Fixing component; 33: Second cylinder; 33a: Second cylinder part; 33b: Second rod part; 33c: Engaging part; 34: Fixing component; 40: Rotary disk; 41: Adsorption means; 41a: Base part; 41b: Adsorption nozzle; 60: Rotary disk; 61: Clamping means; 61a: Clamping component; 80: Mouth side clamp; 80a: Recess; 80b: Inclined surface; 80c: Inclined surface; 80d: Bottom surface; 80e: Corner; 81: Bottom side clamp; 81a: Flat surface; 101: Hollow container; 102: Rotary blow molding part. 104: Rotary Separator; 110: Chain-like Hollow Molded Product; 111: Main Body; 112: Opening; 113: Cover; 114: Flow Path; 115: Remaining Part; 115a: Blow-in Part; 115b: Connecting Part; 116: Clamping Part; 119: Parison; 120: Rotary Disk; 121: Mold Unit; 121A: First Combined Mold; 121A1: Section; 121B: Second Combined Mold; 122: Support Column; 123: Extrusion Die; 124: Cavity; 125: Inlet Groove; 126: Container Molding Part; 127: Remaining Part Molding Part; 127a: Blow-in Part Molding Part; 127b: Connecting Part Molding Part; 128: Flow Path Molding Part; 129: Clamping Part Molding Part; 130: Bearing Hand Section, 131: Recess, 131a: Screw hole, 132: Blocking component, 132a: Screw hole, 133: Washer, 133a: Through hole, 134: Screw, 140: Rotary disk, 141: Separation unit, 142: Lower holding platform, 142a: Mounting part, 142b: Adsorption means, 143: Cover holding platform, 143a: Protrusion, 144: Main body clamping component, 144a: Plate-shaped component, 144b: Clamping piece, 145: Cutting component, 145a: Cutting part, 146: Residue pressing mechanism, 146a: Base, 146b: Support column, 146c: Arm, 146d: Pressing component, 147: Cover pressing mechanism, 147a: Pressing pin, 147b: Drive componentS1: Abutting surface; S2: Abutting surface.

Claims

1. A method for manufacturing a hollow container, wherein, The method for manufacturing the hollow container includes a rotational blow molding process. In the rotary blow molding process, The multiple sets of molds include a first set of molds and a second set of molds, and the multiple sets of molds are configured to be connected in a concentric circle. The molten preform is continuously fed to the multiple sets of molds along the circumferential direction. The multiple sets of molds are gradually closed. Pressurized fluid is introduced into the preform, causing it to expand along the cavities of each mold. The clamping section is then broken off by a mold closing mechanism reinforced by fastening force, allowing the hollow container to be separated independently. Next, the multiple sets of molds are gradually opened, and the individually separated hollow containers are taken out one by one and transferred to the next process. The first combined mold rotates relative to the second combined mold around a rotation axis, which is approximately parallel to the vertical direction of the formed hollow container, thereby performing the mold closing and mold opening. The fastening force strengthening device includes a first cylinder and a second cylinder. The first cylinder has a first rod portion, which is fixed to one of the first and second combined molds. When the mold is closed, the first rod portion extends or retracts towards the other combined mold. The second cylinder has a second rod portion, which is fixed to the other combined mold. When the mold is closed, the second rod portion engages with the first rod portion, restricting the movement of the first rod portion in the contraction direction. When the second rod portion is engaged with the first rod portion, the first rod portion contracts, thereby strengthening the fastening force of the first and second combined molds.

2. A method for manufacturing a hollow container, wherein, The method for manufacturing the hollow container includes a rotational blow molding process and a positioning process. In the rotary blow molding process, Multiple mold sets are configured to be connected in a concentric circle. The molten preform is continuously fed to the multiple sets of molds along the circumferential direction. The multiple sets of molds are gradually closed. Pressurized fluid is introduced into the preform, causing it to expand along the cavities of each mold and be clamped off by mold closing, thus independently separating the hollow container. Next, the multiple sets of molds are gradually opened, and the individually separated hollow containers are taken out one by one and transferred to the next process. In the positioning process, the top and bottom of the formed hollow container, held by the mouth-side clamp and the bottom-side clamp, are used to position the hollow container during transport. The bottom-side clamp has a recess for engaging the end of the severed portion. The end abuts against the corner formed by the bottom and side surfaces of the recess, thereby positioning the hollow container being transported.

3. The method for manufacturing a hollow container according to claim 2, wherein, The multiple sets of molds include a first set of molds and a second set of molds. The first combined mold rotates relative to the second combined mold around a rotation axis, which is approximately parallel to the vertical direction of the formed hollow container, thereby performing the mold closing and the mold opening.

4. The method for manufacturing a hollow container according to claim 3, wherein, The clamping force strengthening device, which strengthens the clamping force between the first combined mold and the second combined mold, clamps off the clamping part during mold closing to independently separate the hollow container.

5. The method for manufacturing a hollow container according to claim 4, wherein, The fastening force strengthening device includes a first cylinder and a second cylinder. The first cylinder has a first rod portion, which is fixed to one of the first and second combined molds, and extends or retracts towards the other combined mold during mold closing. The second cylinder has a second rod portion, which is fixed to the other combined mold and engages with the first rod portion during mold closing, restricting the movement of the first rod portion in the contraction direction. During mold closing, with the second rod engaged with the first rod, the first rod is contracted to strengthen the clamping force of the first combined mold and the second combined mold.

6. The method for manufacturing a hollow container according to any one of claims 1 to 4, wherein, The blank is a stacked blank. The formed hollow container is a stacked peelable container, which is configured to have an outer shell and an inner bag, the inner bag shrinking as the contents are reduced.

7. A mold for forming a hollow container, wherein, The mold comprises a first combined mold and a second combined mold. The mold is configured such that the first combined mold and the second combined mold rotate relative to each other, thereby performing mold closing and mold opening. The mold also includes a fastening force strengthening device to enhance the fastening force of the first combined mold and the second combined mold. The fastening force strengthening device includes a first cylinder. The first cylinder has a first rod portion, which is fixed to one of the first and second combined molds. During mold closing, the rod portion extends and retracts towards the other combined mold. The fastening force strengthening device causes the first rod to retract when the locking part of the other combined mold is engaged with the first rod part during mold closing, thereby strengthening the fastening force of the first combined mold and the second combined mold.

8. The mold according to claim 7, wherein, The fastening force strengthening device also includes a second cylinder. The second cylinder is fixed to the other combined mold and has a second rod portion. The second rod portion has the engaging portion, which engages with the first rod portion during mold closing to restrict the movement of the first rod portion in the contraction direction.

9. A rotary blow molding machine for molding hollow containers, wherein, The molds described in claim 7 or 8 are configured in a concentric circle connection. The molten preform is continuously supplied to multiple sets of molds along the circumferential direction. The multiple sets of molds are gradually closed. Pressurized fluid is introduced into the preform to make it expand along the cavity of each mold. Then the multiple sets of molds are gradually opened to continuously form the hollow container.

10. A method for manufacturing a hollow container, wherein, The method for manufacturing the hollow container includes a rotational blow molding process and a separation process. The rotary blow molding process is Multiple sets of molds are arranged in a concentric circle configuration. The molten preform is continuously fed to the multiple sets of molds along the circumferential direction. The multiple sets of molds are gradually closed. Pressurized fluid is introduced into the preform to cause it to expand along the cavity of the mold. The next step involves gradually opening the multiple sets of molds to continuously form a chain-like hollow molded product connected to the hollow containers. The separation process is the process of independently separating the chain-like hollow molded article into hollow containers. Each of the multiple sets of molds has a means of bearing pressure that can adjust the pressure applied to the clamping portion of the chain-like hollow molded article. The multiple sets of molds each have an openable and closable first combined mold and a second combined mold. The bearing means is configured to be disposed in the first combined mold and protrude from the contact surface of the first combined mold that abuts against the second combined mold. Adjusting the amount of protrusion from the abutment surface allows for adjustment of the pressure applied to the clamping portion.

11. The method for manufacturing a hollow container according to claim 10, wherein, The blank is a stacked blank. The hollow container is a stacked peelable container, which is configured to have an outer shell and an inner bag, the inner bag shrinking as the contents are reduced. The clamping portion is formed at the bottom of the stacked peeling container.

12. The method for manufacturing a hollow container according to claim 11, wherein, The bearing means includes a blocking component and a gasket. The blocking component can be installed on the first combined mold. The gasket is disposed between the first combined mold and the blocking member, thereby enabling adjustment of the amount of protrusion of the blocking member from the abutment surface.

13. A rotary blow molding machine for molding a chain-like hollow molded product consisting of multiple connected hollow containers, wherein, The rotary blow molding machine has multiple sets of molds arranged in a concentric circle configuration. Each of the multiple sets of molds has a means of bearing pressure that can adjust the pressure applied to the clamping portion of the chain-like hollow molded article. The multiple sets of molds each have an openable and closable first combined mold and a second combined mold. The bearing means is configured to be disposed in the first combined mold and to protrude from the contact surface of the first combined mold that abuts against the second combined mold. Adjusting the amount of protrusion from the abutment surface allows for adjustment of the pressure applied to the clamping portion.

14. The rotary blow molding machine according to claim 13, wherein, The bearing means includes a blocking component and a gasket. The blocking component can be installed on the first combined mold. The gasket is disposed between the first combined mold and the blocking member, thereby enabling adjustment of the amount of protrusion of the blocking member from the abutment surface.

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