JP6901684B2 - Manufacturing method of hollow container - Google Patents

Description

The present invention relates to a method for manufacturing a hollow container molded by a blow molding machine.

Conventionally, in order to prevent contamination by germs and foreign substances, a hollow container that is transported in a sealed state until just before filling the contents has been used. As a method for producing such a sealed hollow container, for example, Patent Document 1 discloses a method of forming a sealed state by sealing a blow port (flow passage) in direct blow molding. Has been done.

JP-A-2004-291571

By the way, when sealing the flow path as in Patent Document 1, it is preferable that the diameter of the sealing port is small in order to perform the sealing easily and surely. However, if the diameter of the sealing port is reduced in direct blow molding, burrs are generated around the sealing port, and if burrs remain, it causes a sealing failure and the work of removing the burrs becomes complicated. turn into.

The present invention has been made in view of such circumstances, and provides a method for manufacturing a hollow container capable of appropriately removing burrs formed around a flow path.

According to the present invention, a method for manufacturing a hollow container including a main body portion, a mouth portion, and a tapered cover portion continuous with the mouth portion, the blow molding step, the separation step, and the sealing step. In the blow molding step, a pressurized fluid is introduced into a parison arranged in a split mold, and the mold forms a container forming the main body, the mouth, and the cover. A portion and a connecting member molding portion for forming a connecting member connected to the portion forming the cover portion of the container molding portion are provided, and the pressurized fluid pierces the connecting member molding portion with a blowing nozzle. In the separation step, the tapered cover portion and the connecting member are cut and separated by a plate-shaped cutting member, and the plate-shaped cutting member is placed on one end side thereof. It is provided with a cutting portion for cutting the flow passage connecting the tapered cover portion and the connecting member, and a pressing portion for pressing a burr formed around the flow passage, and was cut in the sealing step. A method for manufacturing a hollow container that seals the flow passage is provided.

According to the present invention, the cutting portion of the cutting member cuts the flow passage, and the pressing portion presses the burrs formed around the flow passage to peel the burrs from the hollow container, so that the burrs are appropriately removed. It is possible.

Preferably, the pressing portion is formed adjacent to both sides of the cutting portion.

Preferably, the tip portion of the pressing portion is configured to press the burr before the cutting portion abuts on the flow path.

Preferably, the end surface of the cut portion on one end side is formed so as to have a V shape in a side view.

Preferably, the end surface of the cutting member on one end side is formed so as to have an M shape in a side view.

Preferably, in the blow molding step, the hollow container and the connecting member molding portion are alternately connected by a rotary blow molding machine including a plurality of mold units including the container molding portion and the connecting member molding portion. In the separation step, the chain-shaped hollow molded product is formed, and in the separation step, the chain-shaped hollow is provided by a rotary separation device including a rotary disk and a plurality of separation units provided along the outer periphery of the rotary disk and having the cutting member. The molded product is continuously separated.

Preferably, the separation unit comprises a restricting member that restricts the hollow container from moving radially outward of the turntable, and the cutting member moves radially outward by causing the flow passage. Is configured to disconnect.

It is an overall block diagram of the manufacturing apparatus which carries out the manufacturing method which concerns on this invention. It is a developed view which shows the mold of the rotary blow molding machine provided in the manufacturing apparatus of FIG. It is a top view of the chain hollow molded article molded by the rotary blow molding machine of FIG. It is a side view of the hollow molded article on the chain of FIG. It is a side view which shows the rotary separation apparatus provided in the manufacturing apparatus of FIG. FIG. 5 is a plan view showing a state of the rotary separator of FIG. 5 before holding the hollow molded product. It is a top view which shows the state which held the hollow molded article of the rotary separating apparatus of FIG. It is a front view which shows the cutting member of the rotary separation apparatus of FIG. It is a figure which shows the sealing device provided in the manufacturing apparatus of FIG. 10A to 10D are front views showing the cutting members of the rotary separator according to the modified example of the present invention, respectively.

Hereinafter, embodiments of the present invention will be described. The various features shown in the embodiments shown below can be combined with each other. In addition, the invention is independently established for each feature.

As shown in FIG. 1, the method for manufacturing a hollow container 1 according to an embodiment of the present invention is carried out by a manufacturing device 5 including a rotary blow molding machine 2, a rotary separating device 3, and a sealing device 4. In the present invention, as shown in FIGS. 3 and 4, the hollow container 1 manufactured has a shape including a main body portion 11, a mouth portion 12, and a tapered cover portion 13 continuous with the mouth portion 12. The flow passage 14 formed at the tip of the cover portion 13 is sealed and is in a sealed state. In the hollow container 1, a chain hollow molded product 10 is first molded by a rotary blow molding machine 2, the chain hollow molded product 10 is separated into individual hollow containers 1 by a rotary separator 3, and then each hollow container 1 is formed. The flow passage 14 is sealed by the sealing device 4. Hereinafter, the configuration of each device will be described first, and then the manufacturing method of the hollow container 1 using these devices will be described in detail.

The two-dot chain line arrow in FIG. 1 indicates the traveling direction of the hollow container 1, and in the following description, the traveling direction of the hollow container 1 is the forward direction. Further, the radial outside of the rotary disk 20 of the rotary blow molding machine 2 and the rotary disk 30 of the rotary separation device 3 are upward, and the directions perpendicular to the forward direction and the upward direction are lateral.

As shown in FIG. 1, the rotary blow molding machine 2 includes a rotary disk 20 that rotates about a horizontal rotation axis by a rotation driving means (not shown), and a plurality of rotary blow molding machines 2 arranged at equal intervals on the outer peripheral surface of the rotary disk 20. It is provided with a set of split molds 21. In the rotary blow molding machine 2, the parison 23 extruded by the extrusion head 22 is poured into the mold 21, the mold 21 is sequentially closed, a pressurized fluid is introduced into the parison 23, and the parison 23 is expanded along the cavity 24. After that, by opening the mold, the chain-shaped hollow molded product 10 to which the hollow container 1 is connected is continuously molded.

Here, in the chain-shaped hollow molded product 10, a plurality of hollow containers 1 and a connecting member 15 (see FIG. 3) for blowing a pressurized fluid are alternately connected. The connecting member 15 is a rectangular parallelepiped-shaped blowing portion formed to pierce the blowing nozzle from the side and allow the pressurized fluid to flow to the flow passage 14 of one of the adjacent hollow containers 1 (right side in FIGS. 2 and 3). It is composed of a thin plate-shaped connecting portion 15b that connects the 15a and the other hollow container 1 (left side in FIGS. 2 and 3). If the blowing nozzle is directly pierced into the cover portion 13 to blow the cover portion 13, debris (foreign matter) when the pin is pierced may enter the container. However, in the configuration of the present embodiment, the pressurized fluid is blown through the blowing portion 15a which is removed in a later step, and the blowing space and the space of the hollow container 1 are separated to prevent foreign matter from entering. It is possible to do. The diameter of the flow passage 14 is small for the purpose of separating the spaces in this way.

As shown in FIG. 2, the mold 21 includes a cavity 24 and an introduction groove 25 for introducing a pressurized fluid into the cavity 24 in order to form the chain-shaped hollow molded product 10 as described above. The cavity 24 includes a container molding portion 26 forming the main body portion 11, the mouth portion 12 and the cover portion 13 of the hollow container 1, a connecting member molding portion 27 forming the connecting member 15, and a flow passage 14 at the tip of the cover portion 13. The flow passage forming portion 28 to be formed is provided. In the present embodiment, the diameter of the flow passage forming portion 28 is smaller than the diameter of the portion where the mouth portion 12 is molded, and specifically, it is 1/2 or less of the diameter of the portion where the mouth portion 12 is molded. ing. Preferably, the diameter of the flow passage forming portion 28 is 1/3 or less, more preferably 1/4 or less of the diameter of the portion for forming the mouth portion 12. The diameter of the flow path forming portion 28 is 15 mm or less, preferably 10 mm or less, and more preferably 5 mm or less. Here, the diameter of the flow passage forming portion 28 corresponds to the outer diameter of the flow passage 14, and the diameter of the portion for forming the mouth portion 12 corresponds to the outer diameter of the mouth portion 12 after the cover portion 13 is cut. .. Further, the connecting member molding portion 27 includes a blowing portion molding portion 27a forming the blowing portion 15a and a connecting portion molding portion 27b forming the connecting portion 15b. In the present embodiment, one container molding portion 26 and one connecting member molding portion 27 are formed in each mold 21 of the rotary blow molding machine 2, and the container molding portion 26 and the connecting member molding portion 27 are hollow. The bottom seal molding portion 29 forming the bottom seal portion 11a on the bottom surface of the container 1 is spaced apart from the bottom seal molding portion 29. Then, the pressurized fluid introduced into the connecting member molding portion 27 of one mold 21 does not flow to the container molding portion 26 of the same mold 21, but passes through the flow passage molding portion 28 of the adjacent mold 21. , Is blown into the container molding portion 26 of the adjacent mold 21. However, it is also possible to form a hollow container 1 and a connecting member 15 that communicate with each other in one mold 21.

Next, as shown in FIG. 1, the rotary separation device 3 is arranged at equal intervals on a rotating disk 30 that rotates about a horizontal rotation axis by a rotation driving means (not shown) and an outer peripheral surface of the rotating disk 30. A plurality of separation units 31 are provided. The rotary separation device 3 separates the hollow container 1 by cutting off the connecting member 15 connecting the adjacent hollow containers 1 in the sequentially chained hollow molded product 10 by a plurality of separation units 31, and then separates the hollow container 1, and then a predetermined rotating portion. The hollow container 1 is configured to be discharged to the sealing device 4.

As shown in FIGS. 5 to 7, the separation unit 31 includes a lower holding base 32, a cover portion holding base 33, a main body portion holding member 34, a cutting member 35, a connecting member pressing mechanism 36, and a cover portion pressing. It includes a mechanism 37.

The lower holding base 32 holds the lower part of the main body portion 11 of the hollow container 1, and has a mounting portion 32a on which the lower end portion of the hollow container 1 is placed and a suction means 32b for vacuum-adsorbing the hollow container 1. Be prepared. The lower holding base 32 is configured to operate upward when the hollow container 1 is discharged to the sealing device 4.

The cover portion holding base 33 is a member that is arranged in front of the lower holding base 32 (left side in FIGS. 5 to 7) and holds the cover portion 13 of the hollow container 1 by the protruding portion 33a extending upward.

The main body portion holding member 34 includes a plate-shaped member 34a arranged on the cover portion holding base 33 and a holding piece 34b extending upward from each plate-shaped member 34a, and the side surface of the main body portion 11 is formed by a pair of holding pieces 34b. It is a member to be sandwiched, and can operate between the non-pinching position shown in FIG. 6 and the sandwiching position shown in FIG. 7.

The cutting member 35 is a plate-shaped member that cuts the flow passage 14 at the tip of the hollow container 1, and as shown in FIGS. 8A and 8B, the cover portion 13 of the hollow container 1 and the connecting member 15 are provided on the upper end surface thereof. A cutting portion 35a for cutting the flow passage 14 connecting the two, and a pressing portion 35b for pressing the burr 14b formed around the flow passage 14 without cutting. In the present embodiment, the cutting portion 35a is a single-edged blade (see FIG. 5), and the side view (front view in FIGS. 8A and 8B) is V-shaped at a position below the pair of tip portions 35t of the pressing portion 35b. It is formed to have a shape. That is, the cutting portion 35a is formed at a position opposite to the cutting direction (the direction in which the cutting member 35 moves when cutting the flow passage 14) with respect to the tip portion 35t of the pressing portion 35b. Further, the pressing portion 35b is formed adjacent to both sides of the cutting portion 35a, and is formed so as to incline downward from the tip portion 35t. The cut portion 35a and the pressing portion 35b form the end surface of the cutting member 35 on one end side so that the side view (front view in FIGS. 8A and 8B) is M-shaped.

As shown in FIGS. 8A and 8B, the cutting member 35 is moved upward by a driving means (not shown) so that the cutting portion 35a cuts the flow passage 14 and the pressing portion 35b pushes up the burr 14b. It is configured. In the present embodiment, since the cutting portion 35a is formed at a position opposite to the cutting direction with respect to the pair of tip portions 35t of the pressing portion 35b, the position where the hollow container 1 is placed is somewhat different. Even if the chain-shaped hollow molded body 10 is misaligned or the chain-shaped hollow molded body 10 flutters, the flow passage 14 can be appropriately cut. Further, since the tip portion 35t of the pressing portion 35b presses the burr 14b before the cutting portion 35a abuts on the flow passage 14, the burr 14b cuts first even if the position is deviated. It is designed so that it will not be done.

The connecting member holding mechanism 36 is a mechanism that is positioned above the connecting member 15 and regulates the upward movement of the connecting member 15, and as shown in FIGS. 5 to 7, the pedestal 36a, the support column 36b, and the support member 36b An arm 36c and a pressing member 36d are provided. In the present embodiment, the pedestal 36a is arranged on the side of the cover portion holding pedestal 33, and the support column 36b is configured to extend upward from the pedestal 36a. The arm 36c is a member in which the base end portion 36c1 is pivotally supported on the upper portion of the support column 36b and extends forward, and the tip portion 36c2 is positioned above the connecting member 15 by forming an L shape in a plan view. It is supposed to be. The pressing member 36d is a member attached to the tip end portion 36c2 of the arm 36c, holding the connecting member 15 and restricting its upward movement. As shown in FIG. 5, the pressing member 36d is arranged on the front end pressing portion 36d1 arranged on the front end side of the connecting member 15 and on the rear end side of the connecting member 15 in order to hold the front end and the rear end of the connecting member 15. The rear end holding portion 36d2 is provided, and the side view is U-shaped.

In the connecting member holding mechanism 36 having the above configuration, the holding member 36d is held in the non-holding position shown in FIG. 6 and the holding member 36d shown in FIG. 7 by rotating the arm 36c with respect to the support column 36b by a driving means (not shown). It is possible to move to and from the position.

As shown in FIGS. 5 to 8, the cover portion holding mechanism 37 is a mechanism that is positioned above the cover portion 13 of the hollow container 1 and restricts the upward movement of the cover portion 13, and is directed toward the side. A cylindrical holding pin 37a extending vertically and a rectangular parallelepiped driving member 37b holding the holding pin 37a are provided. The pressing pin 37a can be moved between the non-pressing position shown in FIGS. 6 and 8A and the pressing position shown in FIGS. 7 and 8B by driving the driving member 37b.

Next, the sealing device 4 is a device that seals the flow passage 14 which is the cutting portion of the hollow container 1 separated by the rotary separating device 3 to seal the hollow container 1, and rotates as shown in FIG. A board 40, a plurality of sets of holding members 41, a plurality of hot air generating means 42, and a sandwiching means 43 are provided.

The turntable 40 is a member that intermittently rotates around a rotation axis in the vertical direction by a rotation drive means (not shown), and is arranged at a position adjacent to the rotary separation device 3 as shown in FIG.

The holding member 41 is a member arranged at equal intervals on the outer peripheral surface of the turntable 40, and includes a pair of holding members 41a as shown in FIG. The holding member 41 is configured to catch the hollow container 1 released by the rotary separating device 3 at a predetermined rotating portion in the direction in which the flow passage 14 is downward, and convey the outer circumference of the rotating disk 40.

The hot air generating means 42 is arranged in an annular shape below the holding member 41 at a position facing the flow passage 14 of the hollow container 1 held by each holding member 41, and includes an outlet 42a for blowing out hot air. The hot air generating means 42 softens the flow passage 14 of each of the hollow containers 1 to be conveyed by the hot air blown from the outlet 42a.

The sandwiching means 43 is arranged in place of the hot air generating means 42 at one of the positions where the hot air generating means 42 is arranged, and drives the pair of sandwiching members 43a and the sandwiching member 43a. It is provided with a driving means 43b. The sandwiching means 43 sandwiches the softened flow passage 14 of each of the hollow containers 1 to be conveyed by a pair of sandwiching members 43a, and sequentially seals the hollow container 1. In FIG. 9, for convenience, the sandwiching member 43a operates in the circumferential direction of the rotary disk 40 to sandwich the flow passage 14, but is actually in the radial direction of the rotary disk 40. It is configured to be sandwiched.

Next, a method of manufacturing the hollow container 1 using the above device will be described. In the present embodiment, the method for manufacturing the hollow container 1 includes a blow molding step, a separation step, and a sealing step (sealing step).

<Blow molding process>
First, in the blow molding step, the rotary disk 20 of the rotary blow molding machine 2 is rotated, the parison 23 extruded by the extrusion head 22 is poured into the mold 21, the mold 21 is sequentially closed, and the mold 21 is sequentially closed from the introduction groove 25. The pressurized fluid is introduced into the parison 23 via the blow nozzle. Then, the parison 23 expands along the cavity 24, and the hollow container 1 and the connecting member 15 are formed by the container molding portion 26 and the connecting member molding portion 27. Then, by opening the mold, the chain-shaped hollow molded product 10 to which the hollow container 1 is connected is continuously molded.

After that, as shown in FIG. 1, the chain-shaped hollow molded article 10 conveyed from the rotary blow molding machine 2 was conveyed on the transfer path 7 via the pulley 6 and arranged at the transfer destination of the transfer path 7. It is carried to the rotary separation device 3 via the pulley 8 and shifts to the separation process. Here, in the present embodiment, the connecting member molding portion 27 of the mold 21 includes the connecting portion molding portion 27b, and the chain-shaped hollow molded product 10 to be molded is the hollow container 1 as shown in FIG. A thin plate-shaped connecting portion 15b is provided between the bottom seal portion 11a and the blowing portion 15a of the connecting member 15. Therefore, bendable hinges 17a and 17b are formed between the bottom seal portion 11a and the connecting portion 15b, and between the blowing portion 15a and the connecting portion 15b, respectively. In this way, the chain-shaped hollow molded product 10 of the present embodiment is provided with two hinges 17a and 17b for each pair of the hollow container 1 and the connecting member 15, and there is no connecting portion 15b and the hinge is 1. Compared with the case where there is only one hinge, the connection angle per hinge can be made looser, and the force applied to the hinge can be dispersed (see FIG. 4). With such a configuration, it is possible to prevent the chain-shaped hollow molded product 10 from being torn during transportation.

Further, in the present embodiment, the chain-shaped hollow molded product 10 conveyed from the rotary blow molding machine 2 is once conveyed on the conveying path 7 and then enters the rotary separating device 3, so that the rotary separation is performed. The vibration (fluttering) of the chain-shaped hollow molded product 10 conveyed to the device 3 is reduced, and each hollow container 1 can be accurately arranged in each separation unit 31 of the rotary separation device 3. In addition, it is also possible to cool the chain-shaped hollow molded product 10 after blow molding by transporting it on the transport path 7. Cooling the chain-shaped hollow molded product 10 has the effect that the burrs 14b are easily peeled off when the chain-shaped hollow molded product 10 is separated in the next separation step. Further, in the sealing step, if the hollow container 1 is sealed while the temperature is high, the hollow container 1 may be dented or deformed due to decompression deformation. It is also possible to suppress dents and deformation. It is also possible to add a cooling step separately to the process of this embodiment.

As in the present embodiment, the dimensional width (height) of the hollow container 1 arranged in the rotary separation device 3 is determined by providing the connecting portion 15b between the hollow container 1 and the connecting member 15 and providing a plurality of hinges. The restrictions can be relaxed. That is, by changing the length of the connecting portion 15b, it is possible to use one rotary separating device 3 for a plurality of rotary blow molding machines 2 (a plurality of types of containers). Specifically, even if the height dimension of the hollow container 1 (that is, the dimension of the container molding portion 26 of the mold) is changed by, for example, ± 30%, the length of the connecting portion 15b is changed accordingly. Therefore, it is possible to use the same rotary separation device 3.

<Separation process>
Next, in the separation step, the rotary disk 30 of the rotary separation device 3 is rotated, and each hollow container 1 of the chain-shaped hollow molded product 10 conveyed from the rotary blow molding machine 2 is arranged in the separation unit 31. At this time, the lower portion of the main body portion 11 of the hollow container 1 is placed on the lower holding base 32, and the cover portion 13 is placed on the cover portion holding base 33. Next, the main body 11 of the hollow container 1 is sucked by the suction means 32b, the main body holding member 34 is moved from the non-holding position shown in FIG. 6 to the holding position shown in FIG. 7, and the hollow container 1 is separated by these. It is fixed to the unit 31.

Next, the pressing member 36d of the connecting member pressing mechanism 36 is moved from the non-pressing position shown in FIG. 6 to the pressing position shown in FIG. 7, and the pressing pin 37a of the cover portion pressing mechanism 37 is moved from the non-pressing position shown in FIGS. 6 and 8A. It is moved from the position to the holding position shown in FIGS. 7 and 8B. Then, by moving the cutting member 35 upward in this state, the flow passage 14 at the tip of the hollow container 1 is cut. The bottom seal portion 11a and the connecting portion 15b of the front hollow container 1 are torn off by the front end pressing portion 36d1 of the pressing member 36d pressing the connecting portion 15b, and the space between the front hollow container 1 and the connecting member 15 is also separated. It is designed to be separated (see FIG. 5).

By the way, in the present embodiment, the flow passage 14 is formed so as to have a diameter smaller than the diameter of the mouth portion 12 so that it can be easily sealed in the next sealing step. Therefore, since the diameter of the flow passage 14 is considerably smaller than the diameter of the parison 23, burrs 14b are almost inevitably generated around the flow passage 14 (see FIG. 3), and the burrs 14b are as shown in FIG. In addition, the shape is such that it extends from the periphery of the flow passage 14 along the outside of the cover portion 13. However, the shape of the burr 14b is not formed by shaping the burr 14b into a mold, and varies depending on the molded product. Then, the burr 14b adheres to the flow passage 14 or the cover portion 13, and there is a possibility that a part of the cut burr 14b remains on the hollow container 1 side even after the flow passage 14 is cut. In particular, when the burrs on both sides of the flow passage 14 are biased, it is difficult to easily remove the smaller burrs.

Therefore, the cutting member 35 of the present embodiment is provided with pressing portions 35b for pressing the burrs 14b on both sides of the cutting portions 35a for cutting the flow passage 14. Since the pressing portion 35b presses the burr 14b without cutting it, the burr 14b is peeled off from the adhering flow passage 14 or the cover portion 13 by a shearing force, and the burr 14b is formed on the hollow container 1 side. It is designed not to remain.

After that, the hollow container 1 from which the connecting member 15 is separated is lifted by moving the holding pin 37a to the non-holding position and raising the lower holding base 32, and the suction of the suction means 32b is released to release the suction of the rotating disk 30. It is discharged to the holding member 41 of the adjacent sealing device 4 by utilizing the rotation.

<Sealing process>
Next, in the sealing step, as shown in FIG. 9, hot air is sequentially blown to the flow passage 14 of the hollow container 1 by the plurality of hot air generating means 42 to soften (melt) the flow passage 14. Then, the sandwiching member 43a of the sandwiching means 43 sandwiches the molten flow passage 14, thereby sealing the hollow container 1.

The hollow container 1 that has completed the sealing step is packed after undergoing an appropriate inspection step.

By the method for manufacturing the hollow container 1 as described above, the burrs 14b are appropriately removed to manufacture the closed hollow container 1.

The present invention can also be implemented in the following aspects.
-In the above-described embodiment, the cutting member 35 has an M-shaped side view as shown in FIG. 8A, but other configurations are also possible. Specifically, for example, as shown in FIG. 10A, the cutting portion 35a has a V shape as in the above embodiment, the pressing portion 35b is horizontal, and as shown in FIG. 10B, the cutting portion 35a is horizontal. The pressing portion 35b can be tilted by setting the position below the pressing portion 35b. Further, as shown in FIG. 10C, a protrusion 35t is provided at the boundary between the cutting portion 35a and the pressing portion 35b, and as shown in FIG. 10D, the cutting portion 35a having a blade and the pressing portion 35b that cannot be cut are used. It is also possible to have a flush and continuous configuration.
-In the above-described embodiment, the hollow container 1 is continuously formed by the rotary blow molding machine 2 and the rotary separating device 3, but it may be sequentially manufactured by a single mold 21. It is possible. Also in this case, the blowing portion 15a for blowing the pressurized fluid is arranged adjacent to the flow passage 14. Also in this case, it is preferable that the cutting member 35 that cuts the hollow container 1 and the connecting member 15 includes a cutting portion 35a and a pressing portion 35b that cannot be cut.

1: Hollow container 2: Rotary blow molding machine 3: Rotary separation device 4: Sealing device 5: Manufacturing equipment, 6, 8: Slider, 7: Transport path, 10: Chain hollow molded product, 11: Main body Part, 11a: Bottom seal part, 12: Mouth part, 13: Cover part, 14: Flow passage, 14b: Burr, 15: Connecting member, 15a: Blow part, 15b: Connecting part, 17a, 17b: Hinge, 20: Turntable, 21: Mold, 22: Extrude head, 23: Parison, 24: Cavity, 25: Introduction groove, 26: Container molding part, 27: Connecting member molding part, 27a: Blow part molding part, 27b: Connecting part Molding part, 28: Flow passage molding part, 29: Bottom seal molding part, 30: Rotating disk, 31: Separation unit, 32: Lower holding base, 32a: Mounting part, 32b: Suction means, 33: Cover part holding base , 33a: protruding part, 34: main body part holding member, 34a: plate-shaped member, 34b: holding piece, 35: cutting member, 35a: cutting part, 35b: pressing part, 35t: protrusion, 35t: tip part, 36: Connecting member holding mechanism, 36a: pedestal, 36b: support, 36c: arm, 36c1: base end, 36c2: tip, 36d: holding member, 36d1: front end holding part, 36d2: rear end holding part, 37: cover part Pressing mechanism, 37a: Pressing pin, 37b: Driving member, 40: Rotating disk, 41: Holding member, 41a: Holding member, 42: Hot air generating means, 42a: Blowout port, 43: Holding means, 43a: Holding member , 43b: Drive means

Claims (7)

A method for manufacturing a hollow container having a main body, a mouth, and a tapered cover that is continuous with the mouth.
It includes a blow molding process, a separation process, and a sealing process.
In the blow molding step, a pressurized fluid is introduced into a parison arranged in a split mold.
The mold is for forming a connecting member for forming a container molding portion forming the main body portion, the mouth portion and the cover portion, and a connecting member connected to the portion forming the cover portion of the container molding portion. With a part
The pressurized fluid is introduced into the parison by piercing the blowing nozzle into the connecting member molding portion.
In the separation step, the tapered cover portion and the connecting member are cut and separated by a plate-shaped cutting member.
The plate-shaped cutting member has, on one end side, a cutting portion for cutting the flow passage connecting the tapered cover portion and the connecting member, and a pressing portion for pressing a burr formed around the flow passage. With and
In the sealing step, a method for manufacturing a hollow container that seals the cut flow path. The method for manufacturing a hollow container according to claim 1, wherein the pressing portion is formed adjacent to both sides of the cutting portion. The method for manufacturing a hollow container according to claim 1 or 2, wherein the tip portion of the pressing portion is configured to press the burr before the cutting portion abuts on the flow path. The method for manufacturing a hollow container according to any one of claims 1 to 3, wherein the end face on one end side of the cut portion is formed so as to have a V shape in a side view. The method for manufacturing a hollow container according to claim 4, wherein the end face on one end side of the cutting member is formed so as to have an M shape in a side view. In the blow molding step, the hollow container and the connecting member molding portion are alternately connected by a rotary blow molding machine provided with a plurality of mold units including the container molding portion and the connecting member molding portion. Mold a hollow molded product,
In the separation step, the chain-shaped hollow molded product is continuously separated by a rotary separation device including a rotary disk and a plurality of separation units provided along the outer periphery of the rotary disk and having the cutting member. The method for manufacturing a hollow container according to any one of items 1 to 5. The separation unit comprises a regulating member that regulates the hollow container from moving radially outward of the turntable.
The method for manufacturing a hollow container according to claim 6 , wherein the cutting member is configured to cut the flow path by moving outward in the radial direction.

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