Forming system, forming piece extractor, mold device, and method of manufacturing a hollow formed piece

Abstract

The present application provides a molding system, a molded article taking-out machine, a mold device, and a method of manufacturing a hollow molded article, which are capable of taking out the molded article from a blow mold without contacting the opening portion and the inner side surface. The molded article taking-out machine (120) of the molding system (100) is provided with an insertion portion (12), an abutting portion (13), a recessed portion (14), and a suction port (12b). The insertion portion (12) is inserted into the hollow molded article (20) through the opening portion (21) serving as a blow pin ejection port of the hollow molded article (20). The abutting portion (13) is arranged around the insertion portion (12) and abuts against the outer peripheral surface of the hollow molded article (20) at a prescribed distance from the opening portion (21) serving as the blow pin ejection port. The recessed portion (14) is provided between the insertion portion (12) and the abutting portion (13) to house the opening portion (21) serving as the blow pin ejection port in a state where the abutting portion (13) abuts against the outer peripheral surface of the hollow molded article (20), and forms a continuous closed space with the inside of the hollow molded article (20). The suction port (12b) is provided in the insertion portion (12) and sucks the atmosphere around.

Description

Technical Field

[0001] This invention relates to a forming system, a forming part removal machine, a mold device, a forming machine, and a method for manufacturing hollow forming parts. Background Technology

[0002] In the past, blow molding has been widely used in the forming of hollow resin containers such as PET bottles. As is known, in blow molding, a hollow preform (preform) is placed in a blow mold, and a blow molding pin is placed inside the preform. Blow molding air is blown into the preform from the blow molding pin, thereby shaping the preform into a shape corresponding to the cavity of the blow mold.

[0003] The molded part is removed from the blow molding mold by opening the mold and using a molded part removal machine. During this removal, the molded part can be removed from the blow molding mold by dropping it from the mold (e.g., Patent Document 1) or by removing the molded part from the blow molding mold while supporting the flange portion (cap screw portion) of the preform that protrudes out of the blow molding mold when the preform is placed in the blow molding mold (e.g., Patent Document 2).

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2006-035672

[0007] Patent Document 2: Japanese Patent Application Publication No. 2007-069241 Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] In recent years, from an environmental protection perspective, there has been a need to manufacture resin containers with thinner walls and lighter weights, as well as to shift towards biodegradable resins. This necessitates the production of resin containers with lower strength compared to the past. If the aforementioned dropping method is used when removing the molded part from the blow molding mold during the manufacturing process of such resin containers, there is a high possibility of breakage of the molded part.

[0010] On the other hand, if the flange portion of the supporting preform is removed in the manner described above, each molded part can be removed individually, thus preventing breakage of the molded parts. However, it is difficult to use the method of supporting flange portions in resin containers that do not have a portion such as a flange portion protruding from the blow mold.

[0011] As a method for individually removing resin containers that do not have a portion protruding from the blow mold, it is also considered to remove the molded part from the blow mold while supporting the inner circumferential surface of the opening of the molded part into which the blow molding pin is inserted. However, in the case of resin containers used for containing beverages and other food products, it is necessary to avoid, from a hygiene point of view, the support member for removing the molded part coming into contact with the opening of the molded part and the inner surface of the container.

[0012] The object of the present invention is to provide a molding system that allows molded parts, even those without a portion protruding from the blow mold, to be removed from the blow mold without contacting the opening or inner surface of the hollow molded part.

[0013] Another object of the present invention is to provide a molded part removal machine suitable for use in a molding system.

[0014] Furthermore, another object of the present invention is to provide a mold device suitable for use in a forming system.

[0015] Another object of the present invention is to provide a method for manufacturing hollow molded parts using a molding system.

[0016] Solution for solving the problem

[0017] The following describes the structure of the present invention used to solve the above-mentioned problems. For ease of understanding, the structure of the present invention is described with reference numerals in the accompanying drawings; however, the use of reference numerals does not limit the present invention to the embodiments.

[0018] To achieve the aforementioned objectives, the molding system of the present invention is based on a molding system that manufactures hollow molded parts 20 by blow molding. Furthermore, the molding system of the present invention includes a molding machine 110 and a molded part removal machine 120. The molding machine 110 includes a mold device 114 for blow molding hollow molded parts within chambers (221, 241, 251). The molded part removal machine 120 uses an adsorption part 10 to adsorb the hollow molded part formed in the mold device 114 and removes the hollow molded part formed in the mold device 114 from the mold device. In this molded part removal machine 120, the adsorption part 10 includes an insertion part 12, an abutment part 13, a recess 14 provided between the insertion part 12 and the abutment part 13, and a suction port 12b. The insertion part 12 is inserted into the hollow molded part through an opening 21 that serves as a blow molding pin outlet. The abutting portion 13 is disposed at a distance from the insert portion 12 and abuts against a portion of the outer peripheral surface 22 of the hollow molded part 20 that is separated from the opening 21, which serves as the blow molding pin outlet, by a predetermined distance. Furthermore, a recess 14 is provided between the insert portion 12 and the abutting portion 13, and when the portion of the hollow molded part having the opening 21, which serves as the blow molding pin outlet, is housed within the recess 14 with the abutting portion 13 abutting against the outer peripheral surface 22 of the hollow molded part, it constitutes a closed space 26 communicating with the internal space 24 of the hollow molded part. Additionally, a suction port 12b is provided in the insert portion 12 and draws air from both the internal space 24 and the closed space 26.

[0019] In this molding system, for example, when the insert portion 12 is inserted into the hollow molded part formed in the mold device 114 through the blow molding pin outlet (opening 21), and the mold device is opened while the surrounding air is being drawn in through the suction port 12b of the insert portion, the hollow molded part 20 moves toward the base end of the insert portion 12 due to the airflow flowing in from the opening 21 of the hollow molded part 20, which serves as the blow molding pin outlet. Through this movement of the hollow molded part, the opening 21 of the hollow molded part, which serves as the blow molding pin outlet, is received in the recess 14. Furthermore, the outer peripheral surface 22 of the hollow molded part, separated by a predetermined distance from the opening 21, which serves as the blow molding pin outlet, abuts against the abutment portion 13, and the recess 14 and the internal space 24 of the hollow molded part 20 form a continuous closed space 26. In this state, ambient air is continuously drawn in from the suction port 12b of the insert 12, thus pressing the outer peripheral surface 22 of the hollow molded part against the abutment portion 13, which reliably supports the outer peripheral surface 22 of the hollow molded part. By moving the hollow molded part in this state, even hollow molded parts that do not have a flange portion protruding from the mold device can be removed from the mold device 114 without the insert 12 contacting the opening or inner surface of the hollow molded part.

[0020] In the more specific adsorption section 10, a substrate 11 is provided that connects the insertion section 12 and the abutment section 13 and forms a recess between the insertion section and the abutment section. Furthermore, an additional suction port 13c is provided on the abutment surface 13b of the abutment section 13 that abuts against the hollow molded member, attracting the outer peripheral surface 22 of the hollow molded member. Additionally, an airflow path 13d communicating with the suction port 12b and the additional suction port 13c is formed inside the insertion section 12, the substrate 11, and the abutment section 13. It should be noted that the suction port 12b and the additional suction port 13c of the insertion section 12 can also be used as nozzles for ejecting pressurized gas. When the insertion section 12 has a nozzle for ejecting pressurized gas, when the insertion section 12 is inserted from the opening 21 in the hollow molded member formed in the mold apparatus, and pressurized gas is ejected from the nozzle 12b of the insertion section, the hollow molded member 20 is pressed against the mold apparatus. In this state, when the mold assembly other than the mold portion corresponding to the bottom of the hollow molded part 20 opposite to the front end of the insert 12 is set to the open mold state, the bottom of the hollow molded part 20 is held pressed against the mold portion corresponding to the bottom. In this state, the abutment portion 13 is moved forward, and when the abutment portion 13 moves to a position abutting against the outer peripheral surface 22 of the hollow molded part, it begins to draw in ambient air from the suction port 12b of the insert 12. As a result, the outer peripheral surface 22 of the hollow molded part 20 is pressed against the abutment portion 13, and the outer peripheral surface 22 of the hollow molded part 20 is supported by the abutment portion 13. Therefore, the outer peripheral surface 22 of the hollow molded part can reliably abut against the abutment surface 13b of the abutment portion 13. In addition, when removing the molded part from the molded part removal machine, if the suction port 13c of the abutment part 13 is switched to the spray port and pressurized gas is sprayed from the spray port 13c of the abutment part 13, the molded part can be removed more reliably.

[0021] Alternatively, the abutment portion 13 may have an elastic body 13e on its abutment surface that abuts against the hollow molded part. When the elastic body 13e is provided, the shape of the abutment surface of the abutment portion 13 is deformed to integrate with the outer peripheral surface of the molded part, thus increasing the contact area between the outer peripheral surface of the molded part and the abutment surface of the abutment portion 13. As a result, the outer peripheral surface of the molded part can be supported more reliably by the abutment portion.

[0022] Alternatively, the mold assembly 114 used in the molding system of the present invention may include a first mold member 252 forming part of a cavity 251 and a second mold member 253 disposed adjacent to the first mold member 252 and forming part of the cavity 251. The mold assembly is configured such that the cavity-forming surface 251Aa of the first mold member 252 and the cavity-forming surface 251Ab of the second mold member are configured differently from the closed mold state, and the hollow molded part formed in the cavity is held in a state abutting against the cavity-forming surface 251Aa of the first mold member. In this mold assembly, the hollow molded part is held in the mold assembly, so even if the mold assembly is set to a split mold-open state for removing the molded part, the hollow molded part remains in the mold assembly. Therefore, the molded part can be easily removed.

[0023] The first mold member 252 has a first bottom wall surface portion 251Aa of the bottom wall surface 251A of the cavity 251 as the constitutive surface of the cavity. Additionally, the second mold member has a second bottom wall surface portion 251Ab of the bottom wall surface 251A of the cavity 251 as the constitutive surface of the cavity. The first bottom wall surface portion 251Aa of the first mold member 252 and the second bottom wall surface portion 251Ab of the second mold member 253 constitute the bottom wall surface 251A of the cavity 251 when the mold is in the closed state. Furthermore, the mold device 114 may be configured to hold the hollow molded part 20 relative to the first bottom wall surface portion 251Aa of the first mold member 252 after the hollow molded part 20 has been formed.

[0024] After forming the hollow molded part, the mold assembly 114 moves the second mold member 253 such that a recess 254 is formed between the second bottom wall portion 251Ab of the second mold member 253 and the outer surface of the hollow molded part. Furthermore, the mold assembly 114 may set the hollow molded part to an adsorption-holding state by setting the recess 254 to a depressurized state, thereby adsorbing and holding it to the first bottom wall portion 251Aa of the first mold member 252. Alternatively, it may be configured to set the recess 254 to a non-adsorption-holding state, thereby setting the hollow molded part to a non-adsorption-holding state, by setting the recess 254 to a non-depressurized state. The adsorption-holding state is obtained by setting the recess 254 to an attraction state, and the non-adsorption-holding state is obtained by setting the recess 254 to a non-attraction state or a pressurized state. The adsorption-holding state can be achieved by providing an attraction port 255a that is exposed within the recess 254 and attracts the atmosphere within the recess 254. According to these structures, the hollow molded part is held in a state of adhering to the first bottom wall surface portion 251Aa, which forms the cavity 251, of the first mold member 252. In the above structure, the hollow molded part is held in the mold device, so even if the mold device is set to the split mold-open state in order to remove the molded part, the molded part is held in the mold device. Therefore, the outer peripheral surface of the hollow molded part can more reliably abut against the abutment portion 13, and the hollow molded part can be removed more easily.

[0025] Alternatively, the mold assembly 114 may have multiple mold members 205 forming walls other than the bottom wall surface 251A of the cavity 251. In this case, it may be configured such that the multiple mold members 205 maintain an attractive state for a predetermined period after leaving the molded part, or the second mold member 253 may move the hollow molded part 20 in a direction away from the first bottom wall surface portion 251Aa after the multiple mold members 205 leave the hollow molded part 20. To achieve this, the second mold member 253 is configured to move in a direction that presses against the hollow molded part formed in the cavity. This allows the hollow molded part 20 to reliably abut against the abutment portion 13 of the suction portion 10. Alternatively, the second mold member 253 may not be moved, and an outlet 255a may be provided that protrudes into the recess 254 and ejects pressurized gas into the recess 254.

[0026] This invention can also be mastered as a method for manufacturing hollow molded parts by blow molding using a molding machine and a molded part removal machine 120. The molding machine has a mold device 114 for blow molding hollow molded parts within chambers (221, 241, 251), and the molded part removal machine 120 uses an adsorption unit 10 to adsorb the hollow molded part 20 formed in the mold device and remove it from the mold device. In this method, firstly, as the mold device 114, a mold device is prepared comprising a first mold member 252 having a first bottom wall surface portion 251Aa having a bottom wall surface 251A of a chamber 251, and a second mold member 253 disposed adjacent to the first mold member 252 and having a second bottom wall surface portion 251Ab having a bottom wall surface of the chamber. Next, when the first bottom wall surface portion 251Aa of the first mold member 252 and the second bottom wall surface portion 251Ab of the second mold member 253 are in a closed mold state, they constitute the bottom wall surface of the chamber. Furthermore, after the hollow molded part 20 is formed, the hollow molded part 20 is adsorbed and held relative to the first bottom wall portion 251Aa of the first mold member 252.

[0027] In another method for removing a blow-molded part from the mold assembly of a molding machine, pressurized gas is first ejected into the part held in the mold assembly. Next, the mold assembly is opened while the pressurized gas is being ejected. Then, a closed space 26 communicating with the interior of the hollow part is formed while the mold assembly is open. After forming the closed space, the pressure inside the closed space is reduced. In this method, for example, when pressurized gas is ejected into the hollow part formed in the blow mold, the hollow part is pressed against the blow mold. In this state, when the blow mold (excluding the mold portion corresponding to the bottom of the hollow part) is opened, the bottom of the hollow part is held pressed against the mold portion corresponding to that bottom. In this state, if the pressure inside the closed space communicating with the interior of the part is reduced, the hollow part can be held in the part removal machine 120. Therefore, even hollow molded parts that do not have a portion protruding from the blow mold can be removed from the blow mold without contacting the opening or inner surface of the hollow molded part 20.

[0028] Invention Effects

[0029] According to the present invention, even hollow molded parts that do not have a portion protruding from the blow mold can be removed from the blow mold without contacting the opening or inner surface of the hollow molded part. Attached Figure Description

[0030] Figure 1 This is a perspective view schematically illustrating an example of a forming system according to an embodiment of the present invention.

[0031] Figure 2 (A) is a schematic side view showing the mold assembly of a forming system according to an embodiment of the present invention in the mold-opening state. Figure 2 (B) is a side view schematically showing the mold assembly of a forming system according to an embodiment of the present invention in the mold-closed state.

[0032] Figure 3 (A) is a perspective view schematically illustrating an example of the suction unit of the molded part removal machine included in a molding system according to an embodiment of the present invention. Figure 3 (B) is a schematic front view showing the adsorption section. Figure 3 (C) is a schematic cross-sectional view showing the adsorption section.

[0033] Figure 4 (A) is schematically shown Figure 3 The front view shown depicts the adsorption section maintaining the state of the molded part. Figure 4 (B) is a schematic cross-sectional view showing the adsorption section.

[0034] Figure 5 (A) through (D) are schematic representations Figure 3 The diagram shows an example of the process by which the adsorption section holds the shaped part.

[0035] Figure 6 (A) is a front view schematically illustrating another example of the suction unit of the forming part removal machine included in a forming system according to an embodiment of the present invention. Figure 6 (B) is a schematic cross-sectional view showing the adsorption section.

[0036] Figure 7 (A) through (D) are schematic representations Figure 3 The figure shows another example of the process by which the adsorption section holds the hollow molded part.

[0037] Figure 8 (A) through (D) are schematic representations Figure 3 The figure shows another example of the process by which the adsorption section holds the hollow molded part.

[0038] Figure 9 This is a schematic diagram illustrating a variation of the mold device included in a forming system according to an embodiment of the present invention. Detailed Implementation

[0039] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following embodiments, the present invention is embodied in a molding system comprising: a molding machine having a mold device for performing injection molding of preforms and blow molding of molded parts in parallel; and a so-called transverse-type molded part extraction machine.

[0040] Figure 1 This is a schematic perspective view of the forming system according to this embodiment. Additionally, Figure 2 (A) and Figure 2 (B) is a schematic side view showing the mold assembly of the forming system. Figure 2 (A) corresponds to the mold opening state. Figure 2 (B) corresponds to the mold closing state. It should be noted that in... Figure 1 In the middle, the following was omitted. Figure 2 (A) and Figure 2 The support frame and intermediate mold shown in (B) are described.

[0041] (Forming action)

[0042] like Figure 1 As shown, the molding system 100 includes a molding machine 110 and a molded part removal machine 120 for removing the molded part formed in the molding machine 110. The mold assembly 114 included in the molding machine 110 includes a chamber 211 that functions as an injection mold and a chamber 221 that functions as a blow mold, but is not particularly limited thereto. In the chamber 211 that functions as an injection mold, a bottomed preform 19 is injection molded. The preform 19 moves to the chamber 221 that functions as a blow mold, in which the desired hollow molded part corresponding to the blow mold is blow molded.

[0043] The forming machine 110 has a known structure (e.g., Japanese Patent Application Publication No. 2018-167453), and a fixed pressure plate 111 and a movable pressure plate 112 are arranged in opposite positions. The movable pressure plate 112 is slidably supported on connecting rods 113 arranged horizontally from the four corners of the fixed pressure plate 111. The movable pressure plate 112 is driven by a mold closing device 115 to move along the connecting rods 113. By this drive, the mold device 114, which includes a fixed mold 201 mounted on the fixed pressure plate 111 and a movable mold 202 mounted on the movable pressure plate 112, is used for mold closing and mold opening.

[0044] The molded part removal machine 120 includes a mounting platform 121, a cross frame 122, a first traveling body 123, a pull-out frame 124, a second traveling body 125, a head 126, and a lifting arm 127. The cross frame 122 extends in the direction in which the molded part produced by the molding machine 110 is moved out of the molding machine. The molded part removal machine 120 is mounted on the molding machine 110 by fixing the base end of the cross frame 122 to the mounting platform 121 provided on the fixed pressure plate 111.

[0045] The first traveling body 123 is supported on the horizontal frame 122 and moves forward and backward along the horizontal frame 122 driven by a servo motor. The pull-out frame 124 is configured such that its base end is fixed to the first traveling body 123 and extends along the opening and closing direction of the mold assembly 114. The second traveling body 125 is supported on the pull-out frame 124 and moves forward and backward along the pull-out frame 124 driven by a servo motor. The head 126 is supported on the lower end of the lifting arm 127. The lifting arm 127 is configured to extend in the vertical direction and moves up and down in the vertical direction driven by the servo motor of the second traveling body 125. As the lifting arm 127 moves in the vertical direction, the head 126 moves up and down in the vertical direction. The head 126 has one or more suction parts 10 (described in detail below) arranged at positions corresponding to the forming position of the movable mold 202.

[0046] like Figure 2 (A) and Figure 2 As shown in (B), the molding machine 110 of this embodiment includes a mold assembly 114 comprising a fixed mold 201, a movable mold 202, and an intermediate mold 203. Figure 2As shown in (A), the intermediate mold 203 has a cuboid shape, which has two main surfaces 231 and 232 arranged opposite to the fixed mold 201 and the movable mold 202, respectively. The intermediate mold 203 is supported by a support frame 117 disposed between the fixed pressure plate 111 and the movable pressure plate 112. The support frame 117 is movably disposed on the connecting rod 113 along the moving direction of the movable pressure plate 112 (the direction in which the connecting rod 113 extends). The support frame 117 is driven independently of the movable pressure plate 112 by a drive device (not shown). In addition, the intermediate mold 203 has a horizontally arranged rotation shaft 235 at the middle position in the vertical direction, which is orthogonal to the moving direction of the movable pressure plate 112, and the rotation shaft 235 is rotatably supported on the support frame 117. Furthermore, by using the servo motor provided in the support frame 117 as a drive source to rotate the rotation axis 235, a state can be achieved where one main surface 231 of the intermediate mold 203 faces the fixed mold 201 and the other main surface 232 faces the movable mold 202, and a state can also be achieved where one main surface 231 faces the movable mold 202 and the other main surface 232 faces the fixed mold 201. That is, by rotating the intermediate mold 203 180 degrees, the combination of the opposing molds can be changed. It should be noted that... Figure 2 (A) and Figure 2 In (B), for illustration purposes, the outline of the intermediate mold 203 located behind the support frame 117 is represented by dashed lines.

[0047] In addition, such as Figure 2 (A) and Figure 2 As shown by the dashed line in (B), a plurality of elongated injection molding chambers 211 with hemispherical bottoms are provided on the surface of the fixed mold 201 opposite to the intermediate mold 203. The fixed mold 201, equipped with the injection molding chambers 211, functions as an injection mold as described later. For example, in the case of a configuration of 2 rows in the horizontal direction and 3 rows in the vertical direction, a total of 6 injection molding chambers 211 are provided in the fixed mold 201. In addition, on one main surface 231 of the intermediate mold 203, blow molding pins 233 are provided at positions corresponding to the injection molding chambers 211 when the intermediate mold 203 is positioned opposite to the fixed mold 201. Similarly, on the other main surface 232 of the intermediate mold 203, blow molding pins 234 are provided at positions corresponding to the injection molding chambers 211 when the intermediate mold 203 is positioned opposite to the fixed mold 201.

[0048] In addition, such as Figure 2 (A) and Figure 2As shown by the dashed line in (B), on the surface of the movable mold 202 opposite to the intermediate mold 203, multiple blow molding chambers 221 are respectively provided at positions corresponding to the blow molding pins 233 and 234 of the intermediate mold 203. In the example above, six blow molding chambers 221 are provided in the movable mold 202. The inner surface of the blow molding chambers 221 has a shape corresponding to the outer surface of the hollow molded part, and the movable mold 202 equipped with the blow molding chambers 221 functions as a blow molding mold as described later.

[0049] like Figure 2 As shown in (B), when the mold assembly 114 is in the closed state with the main surface 231 of the intermediate mold 203 facing the fixed mold 201, the blow molding pin / rod 233 of the main surface 231 of the intermediate mold 203 is inserted into the injection molding chamber 211 of the fixed mold 201. Using the blow molding pin / rod 233 and the injection molding chamber 211, a preform chamber corresponding to the shape of the aforementioned preform (bottomed preform) is formed. Molten resin is injected into this preform chamber from the injection molding device 116 connected to the fixed pressure plate 111 to form the preform 19. When the mold assembly 114 is in the open state, the preform 19 is removed from the injection molding chamber 211 while held in the blow molding pin / rod 233 state (the state covering the blow molding pin / rod 233). (Refer to...) Figure 2 (A)). Furthermore, when the intermediate mold 203 is rotated 180 degrees, the blow molding pin 234 of the preform 19 is configured to be opposite to the blow molding chamber 221 of the movable mold 202.

[0050] Furthermore, when the mold is closed with its main surface 231 facing the fixed mold 201, a blow molding pin / rod 234, which holds the preform 19 on the other side of the main surface 232 of the intermediate mold 203, is inserted into the blow molding chamber 221 of the movable mold 202. In this case, the preform 19 has been injection molded using the blow molding pin / rod 234 beforehand, so the blow molding pin / rod 234 holds the preform 19. In this state, the blow molding pin / rod 234 functions as a blow molding pin, and by blowing blow air (pressurized gas) into the preform 19 from the blow molding pin / rod 234, a hollow molded part 20 with an outer surface corresponding to the shape of the chamber 221 is blow molded. Additionally, at this time, the molded part is detached from the blow molding pin / rod 234 by the blow molding air. It should be noted that... Figure 2 (A) and Figure 2 In (B), for illustration purposes, the hollow molded part 20 blow-molded in the cavity 221 is indicated by dashed lines.

[0051] As described above, in the molding machine 110 of this embodiment, when the mold device 114 is in the mold-closed state, the injection molding of the preform 19 on the fixed mold 201 side of the intermediate mold 203 and the blow molding of the desired hollow molded part 20 on the movable mold 202 side of the intermediate mold 203 are performed in parallel.

[0052] On the other hand, when the mold assembly 114 is in the open mold state, the support frame 117 is arranged with the fixed mold 201 separated from the movable mold 202 and the intermediate mold 203 separated from both the fixed mold 201 and the movable mold 202. At this time, as described above, the preform 19 is held on the blow molding pin 233 on the main surface of the intermediate mold 203 on the fixed mold 201 side, and the preform 19 held on the blow molding pin 234 on the main surface of the intermediate mold 203 on the movable mold 202 side is blow molded as a result of detaching from the blow molding pin 234.

[0053] Furthermore, as described in detail below, when the mold device 114 is in the open state, the head 126 of the above-mentioned molded part extraction machine 120 is inserted into the space between the movable mold 202 and the intermediate mold 203 to remove the hollow molded part 20 held in the cavity 221 of the movable mold 202.

[0054] When the hollow molded part in the chamber 221 is removed, after the intermediate mold 203 rotates 180 degrees, the mold device 114 enters the mold-closed state, and the injection molding of the preform 19 and the blow molding of the hollow molded part 20 are carried out again.

[0055] (Removal of hollow molded parts)

[0056] Next, the removal of the hollow molded part from the chamber 221 will be described. In the example described above, multiple hollow molded parts were formed in one step by blow molding, and these multiple hollow molded parts were removed at once by the molded part removal machine 120. In this embodiment, the structure for removing multiple hollow molded parts formed in each chamber 221 is the same, so the following description will take the example of removing one hollow molded part from one chamber 221 that forms one hollow molded part as an example.

[0057] Figure 3 (A) is a perspective view schematically showing an example of the adsorption section 10 provided in the head 126 of a molding part removal machine 120 according to an embodiment of the present invention. Figure 3 (B) is a schematic front view showing the adsorption section 10. Figure 3 (C) is a schematic cross-sectional view showing the adsorption section 10. Additionally, Figure 4 (A) is schematically shown Figure 3 (A) to Figure 3The front view shown in (C) shows the adsorption section 10 maintaining the state of the hollow molded part 20. Figure 4 (B) is a schematic cross-sectional view showing the state in which the adsorption section 10 holds the hollow molded part 20. It should be noted that the hollow molded part 20 of this embodiment is a bottomed cylindrical beverage container, and includes an opening 21 serving as a drinking spout, a main body 23 composed of cylinders of the same diameter, and a shoulder 22 smoothly connecting the main body 23 and the opening 21. The opening 21 is sealed by heat sealing, therefore the hollow molded part 20 does not have the flange portion (cap screw-on portion) used in conventional molded part removal machines for holding molded parts. The opening 21 is formed as a thick-walled portion with a thickness around its circumference compared to the wall thickness of other parts of the hollow molded part 20 during the injection molding of the bottomed preform described above, which is the preform 19.

[0058] like Figure 3 (A) to Figure 3 As shown in (C), the head 126 of the molded part removal machine 120 has multiple suction sections 10, each having an insertion section 12 and an abutment section 13 formed on a cylindrical substrate 11. The insertion section 12 has a cylindrical shape extending concentrically with the center line of the substrate 11 along an imaginary center line of the substrate 11. Figure 4 As shown in (B), the diameter of the cross-section of the inner insertion part 12 is smaller than the diameter of the opening 21 of the hollow molded part 20 to be transported. The opening 21 is the outlet for the blow molding pin inserted into the hollow molded part 20 for blow molding in the blow molding die, and the inner insertion part 12 is inserted into the hollow molded part 20 through the opening 21.

[0059] In addition, such as Figure 3 (A) to Figure 3 As shown in (C), the insert portion 12 has multiple suction ports 12b at its front end for drawing in ambient air. In this embodiment, the insert portion 12 has one suction port 12b at the center of the front end 12a and four suction ports 12b with equally spaced openings on its outer peripheral surface near the front end 12a, but this is not particularly limited. Each suction port 12b is connected to an airflow path 12c disposed inside the insert portion 12, the other end of which is connected to a piping connection portion 15 protruding from the outer peripheral surface of the substrate 11. A vacuum pump or a vacuum generator (ejector) is connected to this piping connection portion 15, for example, via an on / off valve. By switching the on / off state of the on / off valve and the supply or non-supply of pressurized gas to the vacuum generator, the suction of the multiple suction ports 12b is switched between open and closed (suction state and non-suction state). It should be noted that, as will be described later, the non-suction state includes pressurization.

[0060] like Figure 3 (A) to Figure 3 As shown in (C), the abutment portion 13 has a cylindrical shape that extends along the imaginary centerline of the substrate 11 in a manner concentric with the imaginary centerline of the substrate 11. The axial length of the abutment portion 13 is smaller than the axial length of the insertion portion 12. In this embodiment, the outer diameter of the substrate 11 is the same as the outer diameter of the abutment portion 13, and the outer peripheral surface of the substrate 11 and the outer peripheral surface of the abutment portion 13 form a continuous outer peripheral surface, but this is not particularly limited.

[0061] An annular recess 14 is provided between the insert portion 12 and the abutment portion 13. The annular recess 14 receives the opening 21 of the hollow molded part 20 from which the object is to be transported. With the opening 21 of the hollow molded part 20 from which the object is to be transported received in the annular recess 14, the annular abutment surface 13b of the cylindrical abutment portion 13 continuously abuts against the outer peripheral surface of the hollow molded part 20, which is separated from the opening 21 of the hollow molded part 20 by a predetermined distance. In this embodiment, as... Figure 4 (A) and Figure 4 As shown in (B), the contact portion 13 abuts against the outer peripheral surface formed by the shoulder portion 22.

[0062] In this state, the annular recess 14 forms a closed space 26 communicating with the internal space 24 of the hollow molded part 20. The closed space 26 does not need to be a completely sealed space, as long as it is a space that can depressurize the hollow molded part 20 under the suction action of the suction port 12b of the insertion part 12. That is, as long as the depressurization of the hollow molded part 20 can be achieved under the suction action of the suction port 12b of the insertion part 12, for example, a structure in which there is a gap between the outer peripheral surface of the hollow molded part 20 and the abutment surface 13b of the abutment part 13, or a structure in which there is a through hole or opening on the cylindrical surface of the abutment surface 13b constituting the abutment part 13, can also be used.

[0063] In this embodiment, such as Figure 4 (A) and Figure 4 As shown in (B), the inclined surface integrated with the shoulder 22 of the hollow molded part 20 forms the abutment surface 13b. The abutment surface 13b formed by the inclined surface is provided with a predetermined width at the inner periphery of the abutment portion 13. As a result, the abutment area of ​​the abutment surface 13b formed by the inclined surface, which abuts the abutment portion 13 and the outer peripheral surface of the shoulder 22, is increased, and the enclosed space 26 can be easily formed.

[0064] Furthermore, the abutment portion 13 has additional suction ports 13c on its inclined surface, which serves as the abutment surface 13b that abuts against the hollow molded member 20, for attracting the outer peripheral surface of the hollow molded member 20. In this embodiment, six additional suction ports 13c are provided at equal intervals on the inclined surface, which serves as the abutment surface 13b, but this is not particularly limited. Each suction port 13c is connected to an airflow path 13d disposed inside the abutment portion 13, and the other end of the airflow path 13d is connected to an airflow path 12c. Therefore, the opening and closing (attracting state and non-attracting state) of the suction of the additional suction ports 13c of the abutment portion 13 and the opening and closing of the suction of the suction of the suction port 12b of the insertion portion 12 are switched synchronously.

[0065] Next, the sequence in which the adsorption section 10 holds the hollow molded part 20 will be described. Figure 5 (A) to Figure 5 (D) is a schematic diagram illustrating the process by which the adsorption section 10 holds the hollow molded part 20.

[0066] Figure 5 (A) is shown in preform 19[ Figure 2 [A] The state in which the blow molding pin / rod 233 or 234, which ejects blow molding air after being shaped by blow molding air into a shape corresponding to the cavity 221 of the movable mold 202 which serves as the blow molding mold, is pulled out from the opening 21 of the hollow molded part 20, which serves as the blow molding pin pull-out.

[0067] like Figure 5 As shown in (A), in this embodiment, the movable mold 202 is divided into two parts by a vertical plane containing the imaginary center line of the main body 23 of the hollow molded part 20. Furthermore, when the movable mold 202 is in the open state, a gap is formed that allows the hollow molded part 20 to be moved out along the vertical direction or the direction in which the imaginary center line of the main body 23 extends without interfering with the movable mold 202. It should be noted that in the cavity 221 of the movable mold 202 in the closed state, a recess is provided at a position corresponding to the opening 21 of the hollow molded part 20, integrating with the aforementioned thick-walled portion constituting the opening 21. Therefore, the structure is such that when the preform 19 is disposed in the cavity 221 of the movable mold 202, the preform 19 is entirely housed within the movable mold 202, and the preform 19 (and the hollow molded part 20) do not have any portion protruding outwards from the movable mold 202.

[0068] The adsorption part 10 is arranged with the opening 21 facing the insertion part 12 relative to the hollow molded part 20 in this state, such as Figure 5As shown in (B), the insert portion 12 is inserted into the hollow molded member 20 through the opening 21. In this embodiment, the hollow molded member 20 is arranged with the imaginary center line of the main body 23 horizontal, so the insert portion 12 is inserted into the hollow molded member 20 by moving horizontally, but this is not particularly limited. In addition, in this embodiment, the length of the insert portion 12 in the imaginary center line direction is designed such that the front end 12a of the insert portion 12 is arranged near the switching portion between the shoulder 22 and the main body 23 in the direction extending from the imaginary center line of the hollow molded member 20, but this is not particularly limited.

[0069] Furthermore, in this state, the plurality of suction ports 12b of the insert portion 12 and the plurality of additional suction ports 13c of the abutment portion 13 switch from a non-suction state to a suction state. As a result, the surrounding atmosphere is drawn in from the plurality of suction ports 12b of the insert portion 12, generating an airflow that flows from the outside of the hollow molded part 20 to the inside through the opening 21.

[0070] In this state, such as Figure 5 As shown in (C), the movable mold 202 is set to the open state of the dividing mold. Through the opening of this dividing mold, the hollow molded part 20 moves towards the base end side (substrate 11 side) of the insert 12 due to the airflow flowing in from the opening 21. Through the movement of the hollow molded part 20, as... Figure 5 As shown in (D), the opening 21 of the hollow molded member 20 is received in the recess 14, and the shoulder 22 of the hollow molded member 20 abuts against the inclined surface of the abutment portion 13, which serves as the abutment surface 13b. As a result, the recess 14 and the internal space of the hollow molded member 20 form a continuous hollow space. Furthermore, during this movement, the airflow generated by the suction from the suction port 13c of the abutment portion 13 promotes the movement of the opening 21 toward the recess 14, and the suction from the suction port 13c maintains the shoulder 22 abutting against the abutment surface 13b. In this state, the surrounding atmosphere is also continuously drawn from the suction port 12b of the insertion portion 12, so the shoulder 22 of the hollow molded member 20 is pressed against the abutment surface 13b, and the shoulder 22 of the hollow molded member 20 is reliably supported by the abutment portion 13.

[0071] The adsorption section 10, which holds the hollow molded part 20, is moved vertically upward by the molded part removal machine 120, thereby enabling the hollow molded part 20 to be removed from the movable mold 202.

[0072] As explained above, in the molding system 100 (molded part removal machine 120) equipped with the adsorption section 10 of this embodiment, even hollow molded parts 20 that do not have a portion protruding from the movable mold 202 can be removed from the movable mold 202 without contacting the opening 21 or the inner surface of the hollow molded part 20. Therefore, even hollow molded parts that have undergone thin-walled lightweighting or material changes to biodegradable resin can be removed from the blow mold without damage to the hollow molded part or contamination of the opening.

[0073] It should be noted that, in the above embodiment, as a particularly preferred method, a structure is adopted in which the inclined abutment surface 13b has an additional suction port 13c, but having an additional suction port 13c is not necessary. By continuously drawing ambient air from the multiple suction ports 12b in a state where the recess 14 and the internal space of the hollow molded member 20 form a continuous closed space 26, the shoulder 22 of the hollow molded member 20 is pressed against the inclined abutment surface 13b of the abutment portion 13. Therefore, even without the additional suction port 13c, the shoulder 22 of the hollow molded member 20 is supported by the abutment portion 13. In this case, it is not necessary to provide an abutment surface 13b with an inclined surface on the inner periphery of the abutment portion 13; the inner periphery of the abutment portion 13 can also be formed by a corner or a curved surface.

[0074] In addition, in the above embodiment, the suction opening and closing of suction port 12b and suction port 13c are switched synchronously, but it is also possible to adopt a structure in which a vacuum system for switching the suction opening and closing of suction port 12b and a vacuum system for switching the suction opening and closing of suction port 13c are independently provided.

[0075] Furthermore, in the above embodiment, a structure is described in which a vacuum system that applies attraction to the suction port 12b and the additional suction port 13c is connected to the piping connection 15. However, for example, a structure can also be adopted in which an injector is placed on the substrate 11 and pressurized gas is supplied to the injector using a compressor or the like to reduce the pressure in the air flow path 12c connected to the suction port of the injector.

[0076] Next, based on Figure 6 (A) and Figure 6 (B) will describe another adsorption unit 40 provided in the molding part removal machine of the present invention. Figure 6 (A) is a schematic front view showing the adsorption section 40. Additionally, Figure 6 (B) is a schematic cross-sectional view showing the adsorption section 40. Figure 6 (A) and Figure 6 The adsorption section 40 shown in (B) is used with Figure 3(A) to Figure 3 (C) illustrates that the adsorption part 10 differs only in the structure of the contact part 13. The other structures are identical; therefore, the same elements are labeled accordingly. Figure 3 (A) to Figure 3 The same reference numerals (C) are used in the accompanying drawings. It should be noted that the adsorption part 40 is used in the forming system 100 instead of the adsorption part 10 described above.

[0077] The adsorption section 40 differs from the adsorption section 10 in that it has an elastomer 13e in a portion of the contact section 13 that has a contact surface that abuts against the hollow molded part 20, extending a predetermined length from the front end 13a. The material of the elastomer 13e is not particularly limited, but rubber materials such as silicone rubber, nitrile rubber, and polyurethane rubber can be used. In the adsorption section 40, the elastomer 13e constitutes the entire front end 13a of the contact section 13, and therefore it lacks the contact surface 13b formed by the inclined surface, the additional suction port 13c, and the air flow path 13d present in the aforementioned adsorption section 10.

[0078] In the adsorption section 40, when the abutting section 13 abuts against the outer peripheral surface of the shoulder 22 of the hollow molded member 20, the shape of the elastic body 13e that forms the abutting surface deforms to integrate with the outer peripheral surface of the shoulder 22. As a result, the contact area between the shoulder 22 of the hollow molded member 20 and the elastic body 13e constituting the abutting surface of the abutting section 13 increases, thus enabling the shoulder 22 of the hollow molded member 20 to be supported more reliably by the abutting section 13.

[0079] It should be noted that, in Figure 6 The example shown illustrates an instance where the surface shape of the elastomer 13e is planar, but the surface shape of the elastomer 13e can be any other shape, such as a curved surface. Furthermore, in Figure 6 In the example shown, the structure is designed to lack the inclined contact surface 13b, the additional suction port 13c, and the air flow path 13d. However, even the contact portion 13 with the elastic body 13e can have the inclined contact surface 13b, the additional suction port 13c, and the air flow path 13d. Furthermore, in Figure 6 In the example shown, only the front end of the contact portion 13 is made of an elastomer, but the entire contact portion 13 and the entire adsorption portion 40 may also be made of an elastomer.

[0080] Next, based on Figure 7 (A) to Figure 7(D) will now describe another sequence in which the adsorption section 10 holds the hollow molded part 20. To achieve this sequence, unlike the sequence described above, the suction port 12b of the insertion section 12 of the adsorption section 10 needs to function as an outlet for ejecting pressurized gas. Therefore, in this example, the piping connection section 15 of the adsorption section 10 can be switched between a vacuum system that applies an attraction force to the suction port 12b and a gas supply system that supplies pressurized gas to the suction port 12b.

[0081] Such a structure can be achieved, for example, by using a vacuum pump in a vacuum system and a compressor in a gas supply system, and connecting each system to the piping connection 15 via a three-way valve or the like. However, as a simpler structure, it is preferable to use an ejector and a compressor, and to be able to switch between the state where the vacuum port of the ejector is connected to the piping connection 15 and the state where the output port of the compressor is connected to the piping connection 15 using a solenoid valve or the like. With this structure, pressurized gas can be supplied from the compressor to the ejector to function as a vacuum system, and the compressor can function as a gas supply system.

[0082] Figure 7 Figure (A) shows the state in which the blow molding pin (the aforementioned blow molding pin / rod 233 or 234) that ejects blow molding air is pulled out from the opening 21 of the hollow molded part 20, which serves as the blow molding pin pull-out outlet, after the preform has been shaped by blow molding air into a shape corresponding to the cavity 241 of the movable mold 204. It should be noted that the movable mold 204 is used in the molding system 100 instead of the aforementioned movable mold 202.

[0083] like Figure 7 As shown in (A), in this example, the movable mold 204 differs from the movable mold 202 described above, and is structured such that the mold portion 242 corresponding to the bottom of the hollow molded part 20 does not move when the mold is in the open state. The movable mold 204, excluding the mold portion 242, is similarly divided into two parts by a vertical plane containing the imaginary center line of the main body portion 23 of the hollow molded part 20, and is capable of opening and closing the mold. Similar to the movable mold 202, when the mold is in the open state, it is configured to allow the hollow molded part 20 to be moved out along the vertical direction or the direction in which the imaginary center line of the main body portion 23 extends without interfering with the movable mold 204.

[0084] The adsorption part 10 is arranged with the opening 21 facing the insertion part 12 relative to the hollow molded part 20 in this state, such as Figure 7As shown in (B), the insert portion 12 is inserted into the hollow molded part 20 through the opening 21. Furthermore, in this state, pressurized gas is ejected from the suction port 12b of the insert portion 12 and the additional suction port 13c of the abutment portion 13. That is, when the suction port 13c is switched to an ejection port, the hollow molded part 20 is pressed against the movable mold 204.

[0085] In this state, when the movable mold 204 other than the mold portion 242 corresponding to the bottom of the hollow molded part 20 is set to the split mold open state, such as Figure 7 As shown in (C), the hollow molded part 20 is held in a state where the bottom of the hollow molded part 20 is pressed against the mold portion 242 corresponding to the bottom.

[0086] In this state, the suction port 12b of the insert 12 and the additional suction port 13c of the abutment portion 13 switch to a suction state. As a result, ambient air is drawn in from the suction port 12b of the insert 12, generating an airflow that flows from the outside of the hollow molded member 20 into the inside through the opening 21. Furthermore, the hollow molded member 20 moves towards the base end of the insert 12 due to the airflow flowing in from the opening 21. This movement of the hollow molded member 20, such as... Figure 7 As shown in (D), the opening 21 of the hollow molded part 20 is received in the recess 14, and the shoulder 22 of the hollow molded part 20 abuts against the abutment surface 13b of the abutment part 13, which is formed by an inclined surface. As a result, with... Figure 5 Similarly, in the example shown in (D), the shoulder 22 of the hollow molded part 20 is reliably supported by the abutment portion 13. In addition, when the suction port 12b of the insert portion 12 and the additional suction port 13c of the abutment portion 13 are switched to the suction state, the abutment surface 13b formed by the inclined surface can be moved closer to the shoulder 22 by moving the suction portion 10 toward the hollow molded part 20, and the abutment surface 13b formed by the inclined surface can also abut against the shoulder 22.

[0087] The adsorption section 10, which holds the hollow molded part 20, is moved vertically upward by the molded part removal machine 120, thereby allowing the hollow molded part 20 to be removed from the movable mold 204. Similarly, through this sequence, even hollow molded parts 20 that do not have a portion protruding from the movable mold 204 can be removed from the movable mold 204 without contacting the opening 21 or the inner surface of the hollow molded part 20. Therefore, even molded parts that incorporate thin-walled lightweight construction or material changes to biodegradable resin can be removed from the blow mold without damage or contamination of the opening.

[0088] Furthermore, in the structure described above, the additional suction port 13c can also be used as an outlet for ejecting pressurized gas. Therefore, for example, when the removed hollow molded part 20 is detached from the molded part removal machine 120, pressurized gas can be ejected from the suction port 13c, which serves as an outlet, to more reliably detach the hollow molded part 20.

[0089] It should be noted that, in the structures described above, the suction port 12b in the insert portion 12 is configured to also serve as the outlet for ejecting pressurized gas, but the insert portion 12 can also have an outlet that is independently provided with respect to the suction port 12b. Similarly, the suction port 13c in the contact portion 13 is configured to also serve as the outlet for ejecting pressurized gas, but the contact portion 13 can also have an outlet that is independently provided with respect to the suction port 13c.

[0090] Furthermore, in the structure described above, it is not necessary for the contact part 13 to have both a suction port and a spray port; a structure that does not have one or both of them may also be adopted.

[0091] Furthermore, in this example, the structure of arranging the injector outside the adsorption section 10 was described. For example, the following structure can also be adopted: the injector is placed on the substrate 11, pressurized gas is supplied to the injector using a compressor or the like to reduce the pressure in the air flow path 12c connected to the intake port of the injector, and the exhaust port of the injector is blocked while pressurized gas is supplied to the injector using a compressor or the like to supply pressurized gas to the air flow path 12c connected to the intake port of the injector.

[0092] Next, based on Figure 8 (A) to Figure 8 (D) will describe another sequence of the above-mentioned adsorption section 10 holding the hollow molded part 20. In this sequence, with Figure 7 The different order shown indicates that the mold device (blow molding die) for blow molding maintains the structure of the hollow molded part 20 in the split mold open state.

[0093] Figure 8 Figure (A) shows the state in which the blow molding pin (the aforementioned blow molding pin / rod 233 or 234) that ejects blow molding air is pulled out from the opening 21 of the hollow molded part 20, which serves as the blow molding pin pull-out outlet, after the preform has been shaped by blow molding air into a shape corresponding to the cavity 251 of the movable mold 205. It should be noted that the movable mold 205 is used in the molding system 100 instead of the aforementioned movable mold 202.

[0094] like Figure 8As shown in (A), in this example, the movable mold 205, which constitutes part of the mold assembly 114, is similar to the movable mold 204 described above in that the mold portion on the bottom side of the hollow molded part 20 is not divided by a vertical plane containing the imaginary center line of the main body 23 of the hollow molded part 20. However, unlike the movable mold 204, the mold portion on the bottom side of the hollow molded part 20 in the movable mold 205 is composed of multiple mold members 252 and 253. That is, it is composed of a first mold member 252 that forms a cavity portion that abuts against the periphery of the bottom of the hollow molded part 20 and a second mold member 253 that forms a cavity portion that abuts against the central portion of the bottom of the hollow molded part 20. The second mold member 253 is a cylindrical member concentric with the imaginary center line of the main body 23 of the hollow molded part 20, and is configured to be able to move axially by a drive source such as a hydraulic cylinder (not shown), but there is no particular limitation thereto. It should be noted that the movable mold 205, other than the first mold component 252 and the second mold component 253, is also divided into two parts by a vertical plane containing the imaginary center line of the main body 23 containing the hollow molded part 20, and is capable of opening and closing the split mold. Similar to the movable mold 202, when the split mold is open, it forms a gap that allows the hollow molded part 20 to be moved out along the vertical direction or the direction in which the imaginary center line of the main body 23 extends without interfering with the movable mold 205.

[0095] More specifically, the first mold component 252 has a first bottom wall surface portion 251Aa of the bottom wall surface 251A of the cavity 251 as the constitutive surface of the cavity. The second mold component 253 is disposed adjacent to the first mold component 252 and has a second bottom wall surface portion 251Ab of the bottom wall surface 251A of the cavity 251 as the constitutive surface of the cavity. When the mold is in the closed state, the first bottom wall surface portion 251Aa of the first mold component 252 and the second bottom wall surface portion 251Ab of the second mold component 253 constitute the bottom wall surface 251A of the cavity 251. Furthermore, after forming the hollow molded part 20, the mold assembly 114 holds the hollow molded part relative to the first bottom wall surface portion 251Aa of the first mold component 252.

[0096] The adsorption and retention action is explained. Relative to the hollow molded part 20, such as... Figure 8As shown in (B), the second mold member 253 moves in the direction of separation from the hollow molded part 20, and the constituent surfaces of the chamber 251 of the first mold member 252 and the chamber of the second mold member 253 are configured differently from those in the mold-closed state (closed state). This forms a recess 254 with the first mold member 252 as its wall surface. That is, after the hollow molded part is formed, the second mold member 253 is moved such that a recess 254 is formed between the second bottom wall portion 251Ab of the second mold member 253 and the outer surface of the hollow molded part. Furthermore, due to the movement of the second mold member 253, a suction port 255a provided on the wall surface of the recess 254 formed by the first mold member 252 is exposed. The suction port 255a is connected to an airflow path 255 provided inside the first mold member 252, and the other end of the airflow path 255 is connected to a vacuum pump or vacuum generator via an on / off valve or the like. By switching the opening and closing of the valve and the supply and non-supply of pressurized gas to the vacuum generator, the suction port 255a can be switched between open and closed (suction state and non-suction state). Additionally, in this example, the suction port 255a also functions as an outlet for ejecting pressurized gas, but this is not particularly limited. Therefore, a vacuum system that applies suction to the suction port 255a and a gas supply system that supplies pressurized gas to the suction port 255a can be switched at the other end of the airflow path 255.

[0097] When the suction port 255a is exposed in the recess 254 due to the movement of the second mold member 253, the suction port 255a switches to the suction state. Thus, the hollow molded part 20 is held in a state where its bottom periphery abuts against the first mold member 252. That is, by setting the recess 254 to a depressurization state, the mold device 114 can hold the hollow molded part in a state where it is held adsorbed against the first bottom wall portion 251Aa of the first mold member 252. In the above structure, the hollow molded part is held adsorbed in the mold device, so even if the mold device is set to a split mold opening state to remove the molded part, the molded part remains in the mold device. Therefore, the outer peripheral surface of the hollow molded part can more reliably abut against the abutment portion 13, and the hollow molded part can be removed more easily. Therefore, the suction portion 10 is arranged with the opening portion 21 and the insertion portion 12 facing each other, as shown... Figure 8 As shown in (B), the insert portion 12 is inserted into the hollow molded part 20 through the opening 21.

[0098] In this state, even if the movable mold 205 other than the first mold component 252 and the second mold component 253 is set to a split mold open state, such as Figure 8 As shown in (C), the hollow molded part 20 is held in place by adhering to the periphery of the bottom surface of the hollow molded part 20 against the first mold member 252.

[0099] In this state, the suction port 12b of the insert 12 and the suction port 13c of the abutment 13 are switched to a suction state. As a result, ambient air is drawn in from the suction port 12b of the insert 12, generating an airflow that flows from the outside of the hollow molded part 20 into the inside through the opening 21. Furthermore, by setting the recess 254 to a non-reduced pressure state, the hollow molded part is set to a non-adhesive holding state, not adhering to and held on the first bottom wall portion 251Aa of the first mold member 252. In this embodiment, the suction port 255a exposed in the recess 254 is switched to a state of ejecting pressurized gas. As a result, the adhesive holding at the bottom of the hollow molded part 20 is released, and the hollow molded part 20 moves towards the base end side of the insert 12 due to the pressurized gas ejected from the suction port 255a and the airflow flowing in from the opening 21. Through this movement of the hollow molded part 20, such as... Figure 8 As shown in (D), the opening 21 of the hollow molded part 20 is received in the recess 14, and the shoulder 22 of the hollow molded part 20 abuts against the abutment surface 13b of the abutment part 13, which is formed by an inclined surface. As a result, with... Figure 5 Similarly, in the example shown in (D), the shoulder 22 of the hollow molded part 20 is more reliably supported on the abutment portion 13. It should be noted that in this example, the hollow molded part 20 is held by adsorption on the first mold member 252. Therefore, when the movable mold 205 is set to the split mold open state, by moving the adsorption portion 10 toward the hollow molded part 20, the abutment surface 13b can be brought closer to the shoulder 22, and the abutment surface 13b can also abut against the outer peripheral surface constituting the shoulder 22.

[0100] The adsorption section 10, which holds the hollow molded part 20, is moved vertically upward by the molded part removal machine 120, thereby allowing the hollow molded part 20 to be removed from the movable mold 205. Similarly, through this sequence, even hollow molded parts 20 that do not have a portion protruding from the movable mold 205 can be removed from the movable mold 205 without contacting the opening 21 or the inner surface of the hollow molded part 20. Therefore, even hollow molded parts that incorporate thin-walled lightweight construction or a change in material to biodegradable resin can be removed from the blow mold without damage to the molded part or contamination of the opening.

[0101] It should be noted that, in the structures described above, the suction port 255a is preferably configured to also serve as the outlet for ejecting pressurized gas. However, a structure in which the recess 254 has an outlet independently provided from the suction port 255a is also possible. Furthermore, from the viewpoint of assisting in the detachment of the hollow molded part 20 held by the suction, the outlet for ejecting pressurized gas can be replaced, as in... Figure 9As shown, the second mold component 253 is configured to move in the direction of pressing the hollow molded part 20. Furthermore, the aforementioned structure assisting in the release of the adsorbed and held hollow molded part 20 is not necessary; a structure that simply switches the suction port 255a to a non-suction state can also be used.

[0102] Furthermore, in the structure described above, from the viewpoint of preventing the hollow molded part 20 from falling, such as Figure 8 As shown in (B), the insert 12 is inserted into the hollow forming part 20 when the dividing mold is closed, but it is also possible to insert the insert 12 into the hollow forming part 20 after the dividing mold is open.

[0103] Furthermore, in the structures described above, it is particularly preferred that the second mold member 253 is driven, but it is sufficient as long as the first mold member 252 and the second mold member 253 can move relative to each other. Additionally, providing an suction port 255a is not necessary. For example, as long as the cavity forming surface of the first mold member surrounds the cavity forming surface of the second mold member, an attraction force on the molded part can be generated by configuring the cavity forming surfaces of the first and second mold members in a different configuration than in the closed mold state. A structure that uses this attraction force to hold the molded part is also possible. Furthermore, the portion of the molded part held by the attraction force is not limited to the bottom; other portions can also be held.

[0104] As explained above, according to the present invention, even molded parts that do not have a portion protruding from the blow mold can be removed from the blow mold without contacting the opening or the inner surface.

[0105] It should be noted that the above-described embodiments do not limit the technical scope of the present invention. In addition to the embodiments already described, various modifications and applications can be made within the scope of the present invention. For example, the constituent elements of the examples described above can be appropriately and arbitrarily combined.

[0106] Furthermore, the number, shape, and arrangement of the suction ports in the adsorption section and the number, shape, and arrangement of the ejection ports described above are merely examples and can be appropriately modified. Similarly, the number, shape, and arrangement of the recesses and protrusions in the mold device described above are merely examples and can be appropriately modified. Moreover, the physical shape and material of each of the above-mentioned elements can be arbitrarily changed within the scope of achieving the effects of the present invention.

[0107] Industrial applicability

[0108] According to the present invention, even molded parts that do not have a portion protruding from the blow mold can be removed from the blow mold without contacting the opening or the inner surface, which is useful as a molding system, a molded part removal machine, a molded part removal method, a mold assembly, a molding machine, and a driving method for the mold assembly.

[0109] Explanation of reference numerals in the attached figures

[0110] 10, 40 Adsorption section

[0111] 11 base plate

[0112] 12 Interpolation section

[0113] 12b Suction port (ejector outlet)

[0114] 12c airflow path

[0115] 13 Butt part

[0116] 13b Abutment surface (the inclined surface of the abutment part)

[0117] 13c Suction port (ejection outlet)

[0118] 13d airflow path

[0119] 13e Elastomer

[0120] 14 recess

[0121] 15 Piping Connections

[0122] 20 Hollow Molded Parts

[0123] 21. Opening (blow molding pin pull-out outlet)

[0124] 22. Shoulder (outer periphery)

[0125] 23 Main body

[0126] 100 Molding System

[0127] 110 forming machine

[0128] 114 Mold Device

[0129] 120 Formed Parts Extraction Machine

[0130] 202, 204, 205 Movable molds (blow molding molds)

[0131] 221, 241, 251 Blow Molding Chambers

[0132] 252 First mold component

[0133] 253 Second mold component

[0134] 254 Recess

[0135] 255a Suction port (ejection outlet).

Claims

1. A molding system for manufacturing hollow molded parts by blow molding. The forming system is characterized by having: A forming machine having a mold device for blow molding the hollow part within a cavity; and A part removal machine uses an adsorption unit to adsorb the hollow part formed in the mold device and remove it from the mold device. The adsorption unit of the formed part removal machine includes: An insert portion is inserted into the hollow molded part through a blow molding pin outlet. An abutting portion is disposed at a distance from the insert portion and abuts against a portion of the outer peripheral surface of the hollow molded part, which is separated from the blow molding pin outlet by a predetermined distance. The recess is provided between the insert and the abutment, and when the abutment abuts against the outer peripheral surface of the hollow molded part, it accommodates the portion of the hollow molded part that forms the blow molding pin outlet, thus forming a closed space that communicates with the internal space of the hollow molded part. as well as A suction port, located within the insert, draws in air from the internal space and the enclosed space. The mold assembly includes: A first mold component having a first bottom wall portion of the bottom wall surface of the cavity; as well as A second mold component, disposed adjacent to the first mold component, and having a second bottom wall portion of the bottom wall surface of the cavity, When the first bottom wall portion of the first mold component and the second bottom wall portion of the second mold component are in the closed mold state, they constitute the bottom wall surface of the cavity. The mold device is configured to hold the hollow molded part relative to the first bottom wall portion of the first mold member after the hollow molded part has been formed.

2. The forming system according to claim 1, wherein, The mold device is configured as follows: After the hollow molded part is formed, the second mold component is moved in such a way that a recess is formed between the second bottom wall portion of the second mold component and the outer surface of the hollow molded part. By setting the recess to a depressurized state, the hollow molded part is thus set to an adsorption-holding state, adsorbed and held on the first bottom wall portion of the first mold component. By setting the recess to a non-depressurized state, the hollow molded part is set to a non-adhesive holding state that is not adsorbed and held on the first bottom wall portion of the first mold component.

3. The forming system according to claim 2, wherein, The adsorption retention state is obtained by setting the recess into an attraction state. The non-adsorption retention state is obtained by setting the recess to a non-attractive state or a pressurized state.

4. The forming system according to claim 1, wherein, The mold assembly includes a plurality of mold components forming the walls other than the bottom wall of the chamber. After the plurality of mold components separate from the hollow molded part, the second mold component moves in such a way that the hollow molded part moves in a direction that separates from the first bottom wall portion.

5. A molding system that manufactures hollow molded parts by blow molding. The forming system is characterized by having: A forming machine having a mold device for blow molding the hollow part; and A part removal machine uses an adsorption unit to adsorb the hollow part formed in the mold device and remove it from the mold device. The adsorption unit of the formed part removal machine includes: An insert portion is inserted into the hollow molded part through a blow molding pin outlet. An abutting portion is disposed at a distance from the insert portion and abuts against a portion of the outer peripheral surface of the hollow molded part, which is separated from the blow molding pin outlet by a predetermined distance. The recess is provided between the insert and the abutment, and when the abutment abuts against the outer peripheral surface of the hollow molded part, it accommodates the portion of the hollow molded part that forms the blow molding pin outlet, thus forming a closed space that communicates with the internal space of the hollow molded part. as well as An intake port is provided in the insert and draws in air from the interior space and the enclosed space.

6. The forming system according to claim 5, wherein, The adsorption portion includes a connecting portion that connects the insertion portion and the abutting portion and forms the recess between the insertion portion and the abutting portion. An additional suction port is provided on the abutting surface of the abutting portion that abuts against the hollow molded part to attract the outer peripheral surface of the hollow molded part. An airflow path communicating with the suction port and the additional suction port is formed inside the insert, the connecting part and the abutting part.

7. The forming system according to claim 6, wherein, The suction port of the insert and the additional suction port also serve as nozzles for ejecting pressurized gas.

8. A mold apparatus for use in a molding system, the molding system utilizing a suction unit of a molded part extractor to suction the formed hollow molded part from the mold apparatus of a molding machine having a mold apparatus for blow molding a hollow molded part in a cavity, wherein, The die assembly used in the forming system includes: A first mold component, which forms part of the chamber; and The second mold component is disposed adjacent to the first mold component and forms part of the cavity. The cavity forming surfaces of the first mold component and the cavity forming surfaces of the second mold component are configured differently from the closed mold state, and the hollow molded part formed in the cavity is held in an adhering state against the cavity forming surface of the first mold component.

9. The mold apparatus for use in a forming system according to claim 8, characterized in that, The first mold component is a first mold component having a first bottom wall surface portion of the bottom wall surface of the cavity as a constituent surface of the cavity. The second mold component is a second mold component in which a portion of the second bottom wall surface of the cavity serves as a constituent surface of the cavity. When the first bottom wall portion of the first mold component and the second bottom wall portion of the second mold component are in the closed mold state, they constitute the bottom wall surface of the cavity. The mold device used in the forming system is configured to hold the hollow molded part relative to the first bottom wall portion of the first mold member after the hollow molded part has been formed.

10. The die assembly for use in a forming system according to claim 9, wherein, The mold device used in the forming system is configured as follows: After the hollow molded part is formed, the second mold component is moved in such a way that a recess is formed between the second bottom wall portion of the second mold component and the outer surface of the hollow molded part. By setting the recess to a depressurized state, the hollow molded part is thus set to an adsorption-holding state, adsorbed and held on the first bottom wall portion of the first mold component. By setting the recess to a non-depressurized state, the hollow molded part is set to a non-adhesive holding state that is not adsorbed and held on the first bottom wall portion of the first mold component.

11. The die assembly for use in a forming system according to claim 10, wherein, The adsorption retention state is obtained by setting the recess into an attraction state. The non-adsorption retention state is obtained by setting the recess to a non-attractive state or a pressurized state.

12. The die assembly for use in a forming system according to claim 11, wherein, The mold assembly used in the forming system includes a plurality of mold components forming the walls other than the bottom wall of the cavity. The die assembly used in the forming system is configured to maintain the attraction state for a predetermined period after the plurality of die components separate from the hollow molded part.

13. The die assembly for use in a forming system according to claim 11, wherein, The mold device used in the forming system has an suction port that is exposed within the recess and draws in the atmosphere within the recess.

14. The die assembly for use in a forming system according to claim 8, wherein, The second mold component is configured to move toward pressing the hollow molded part formed in the cavity.

15. The die assembly for use in a forming system according to claim 11, wherein, The mold device used in the forming system has an outlet that protrudes into the recess and ejects pressurized gas into the recess.

16. A molded part removal machine that uses an adsorption section to adsorb a hollow molded part formed by blow molding and removes the hollow molded part formed by blow molding from the mold device of the molding machine, wherein, The adsorption unit comprises: An insert portion is inserted into the hollow molded part through a blow molding pin outlet. An abutting portion is disposed at a distance from the insert portion and abuts against a portion of the outer peripheral surface of the hollow molded part, which is separated from the blow molding pin outlet by a predetermined distance. The recess is provided between the insert and the abutment, and when the abutment abuts against the outer peripheral surface of the hollow molded part, it accommodates the portion of the hollow molded part that forms the blow molding pin outlet, thus forming a closed space that communicates with the internal space of the hollow molded part. as well as An intake port is provided in the insert and draws in air from the interior space and the enclosed space.

17. The forming part removal machine according to claim 16, wherein, The abutting portion has an additional suction port on the abutting surface that abuts against the hollow molded part, which attracts the outer peripheral surface of the hollow molded part.

18. The forming part removal machine according to claim 16, wherein, The abutting portion has an elastic body on the abutting surface that abuts against the hollow molded part.

19. A method for manufacturing hollow molded parts by blow molding, wherein the following is used: A forming machine having a mold device for blow molding hollow parts within a cavity; as well as A part removal machine uses an adsorption unit to adsorb the hollow part formed in the mold device and remove it from the mold device. The method for manufacturing hollow molded parts by blow molding is characterized by comprising the following steps: As the mold device, a mold device is prepared comprising a first mold member having a first bottom wall portion having a bottom wall surface of the cavity and a second mold member disposed adjacent to the first mold member and having a second bottom wall portion having the bottom wall surface of the cavity; When the first bottom wall portion of the first mold component and the second bottom wall portion of the second mold component are in the closed mold state, they constitute the bottom wall surface of the cavity. as well as After the hollow molded part is formed, it is held adsorbed relative to the first bottom wall portion of the first mold component.

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