Blow molding apparatus and blow molding method

Abstract

To provide a blow molding device that can suppress a decrease in production efficiency while preventing the discharge of defective products to subsequent processes.SOLUTION: A blow molding device 2 uses a plurality of dies and repeatedly performs a blow molding process for each die holding a molding object into which a blow fluid is supplied, to make a hollow molded product. The blow molding device 2 includes: a burst monitoring unit 2301 that monitors each die as to whether a burst in the molded product occurs in the blow molding process and identifies, out of the plurality of dies, the die that has been detected to burst, as a burst die; and an expulsion control unit 2302. When any burst die is identified, the expulsion control unit uses the plurality of dies including the burst die to repeat a blow molding process for each die and also repeats an expulsion process to expel a product molded in the burst die out of the discharge line for discharging the molding products.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a blow molding apparatus and a blow molding method.

Background Art

[0002] Conventionally, in a blow molding apparatus that performs a blow molding process for molding a molded body from a preform (such as a preform or a parison) using a mold, the pressure of the blow fluid supplied into the preform is monitored. For example, in Patent Document 1, in a blow molding apparatus equipped with a blowing pressure detection sensor, when the blowing pressure in the preform does not reach the set value even after a sufficient time has elapsed for the blowing pressure in the preform to reach the set value, it is considered that some abnormality has occurred on the blowing side, and a warning to that effect is disclosed. side, and a warning to that effect is disclosed. side, and a warning to that effect is disclosed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a blow molding apparatus, in order to improve production efficiency, a molded body is produced by repeatedly performing a blow molding process for each mold using a plurality of molds. However, as described above, when a pressure abnormality occurs due to pressure monitoring of the blow fluid, and the pressure abnormality causes bursting (rupture ) of the molded body, fragments of the molded body due to the burst scatter and adhere to the inside of the mold. Then, the adhered fragments of the molded body are molded in the next blow molding process ) of the molded body, fragments of the molded body due to the burst scatter and adhere to the inside of the mold. Then, the adhered fragments of the molded body are molded in the next blow molding process of the molded body. Because the transfer of the substance to the body can result in defective products, there is a possibility that these defective products will be sent to subsequent processes. Yes, there was. Therefore, if a molded body bursts, the equipment user must remove the fragments of the molded body. The removal process from the mold requires stopping the blow molding machine, resulting in low production efficiency. He was inviting people downstairs.

[0005] In view of the above problems, the present invention aims to prevent the discharge of defective products to subsequent processes while reducing production efficiency. The objective is to provide a blow molding apparatus and blow molding method that can suppress [unclear]. To target. [Means for solving the problem]

[0006] To achieve the above objective, a blow molding apparatus according to one aspect of the present invention is provided. Using multiple molds, blow fluid is supplied into the molded body held between the molds, creating a hollow A blow molding apparatus that repeatedly performs a blow molding process to form a molded body in a specific shape for each of the aforementioned molds. hand, In the blow molding process, whether or not a burst occurred in the molded body is monitored for each mold. The molds in which the occurrence of the burst is detected are identified as the burst-occurring molds. The burst monitoring unit identifies it as, When the burst-generating mold is identified, a plurality of molds including the burst-generating mold are identified. Using this method, the blow molding process is repeated for each mold, and the molded body is removed. The discharge line from which the molded body formed by the burst-generating mold is discharged. It includes a rejection control unit that repeatedly performs processing. [Effects of the Invention]

[0007] According to one aspect of the present invention, a blow molding apparatus can detect the occurrence of a burst among a plurality of molds. When the taken-out mold is identified as the burst-occurring mold, blow molding processes using a plurality of molds including the burst-occurring mold are repeatedly performed for each mold, and only the molded body formed by the burst-occurring mold is repeatedly ejected from the discharge line. Therefore, the molded body can be repeatedly molded using a plurality of molds without stopping the blow molding apparatus, and thus the molded body can be continuously produced using molds other than the burst-occurring mold. On the other hand, although the molded body formed by the burst-occurring mold becomes a defective product because fragments of the molded body due to the burst are transferred thereto, it is ejected from the discharge line, so that the discharge of the defective product to the subsequent process can be prevented. And when the blow molding process is performed on the burst-occurring mold, fragments of the molded body due to the burst are transferred to the molded body ejected from the discharge line, so that the fragments of the scattered molded body are removed, and thus the work of removing the fragments of the molded body by the apparatus user can be omitted or simplified. Therefore, it is possible to suppress a decrease in production efficiency while preventing the discharge of defective products to the subsequent process. When the taken-out mold is identified as the burst-occurring mold, blow molding processes using a plurality of molds including the burst-occurring mold are repeatedly performed for each mold, and only the molded body formed by the burst-occurring mold is repeatedly ejected from the discharge line. Therefore, the molded body can be repeatedly molded using a plurality of molds without stopping the blow molding apparatus, and thus the molded body can be continuously produced using molds other than the burst-occurring mold. On the other hand, although the molded body formed by the burst-occurring mold becomes a defective product because fragments of the molded body due to the burst are transferred thereto, it is ejected from the discharge line, so that the discharge of the defective product to the subsequent process can be prevented. And when the blow molding process is performed on the burst-occurring mold, fragments of the molded body due to the burst are transferred to the molded body ejected from the discharge line, so that the fragments of the scattered molded body are removed, and thus the work of removing the fragments of the molded body by the apparatus user can be omitted or simplified. Therefore, it is possible to suppress a decrease in production efficiency while preventing the discharge of defective products to the subsequent process. The above-described problems, configurations, and effects will be clarified in the embodiments for implementing the invention described below.

Brief Description of the Drawings

[0008] [[ID=2,6]]The above-described problems, configurations, and effects will be clarified in the embodiments for implementing the invention described below. The above-described problems, configurations, and effects will be clarified in the embodiments for implementing the invention described below.

Brief Description of the Drawings

[0009] [Figure 1] FIG. is an overall configuration diagram showing an example of the container molding system 1. [Figure 2] FIG. is a schematic plan view showing an example of the blow molding apparatus 2. [Figure 3] FIG. is a schematic configuration diagram showing an example of the molding unit 22. [Figure 4] FIG. is a block diagram showing an example of the blow molding apparatus 2. [Figure 5]It is a graph showing the change in the pressure measurement value in the blow molding process. [Figure 6] It is a diagram showing an example of the operation of the ejection process.

Embodiments for Carrying out the Invention

[0010] Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the following, The scope necessary for the description to achieve the object of the present invention is schematically shown, and the scope necessary for the description of the relevant part of the present invention will mainly be described, and the parts where the description is omitted shall be based on known techniques. shall be assumed.

[0011] (Configuration of the container molding system 1) FIG. 1 is a schematic diagram showing an example of the container molding system 1. The container molding system 1 functions as a production system that produces a hollow molded body 4 by blow molding using a mold 20. In the present embodiment, a container (PET bottle), which is one form of the molded body 4, is produced from a preform 3, which is one form of the molded object made of polyethylene terephthalate (P ET) as a raw material, mainly by the biaxial stretch blow molding method. will be mainly described.

[0012] The main components of the container molding system 1 include an injection molding apparatus 10, a preform removing apparatus 11, a preform conveying conveyor 12, a preform supply apparatus 13, a b low molding apparatus 2, a molded body removing apparatus 14, a molded body conveying conveyor 15, and an ejection conveyor 1 6.

[0013] In the container molding system 1, a synthetic resin as a raw material is put into the injection molding apparatus 10 and the preform 3 is molded by the injection molding apparatus 10. The preform 3 is a preform The preforms are removed from the injection molding machine 10 by the preform removal device 11 and transported to the preform conveyor 1 It is then transferred to 2 and heated to a predetermined temperature while flowing along the preform conveyor belt 12. Then, the preform 3 is sequentially supplied to the blow molding machine 2 by the preform supply device 13. Then, the preform 3 is molded into a molded body 4 (PET bottle) by the blow molding machine 2. The molded body 4 is removed from the blow molding apparatus 2 by the molded body removal device 14. The molded body is transferred to the molded body conveyor 15, and as it flows along the molded body conveyor 15, for example, A device for attaching shrink film and labels to the molded body 4, and a device for filling the molded body 4 with beverages. The product is then transported to subsequent processes such as a filling device and a crimping device that crimps the lid onto the molded body 4.

[0014] When the molded body 4 is formed from the preform 3 by the blow molding apparatus 2, for example, When a pressure anomaly such as a burst is detected, the system that detected the pressure anomaly Feature 4 is an output line that delivers a normal molded body 4 to a subsequent process (in the example in Figure 1, a molded body transport line). Instead of being transferred to the conveyor belt 15, the molded body is transferred to the discard conveyor belt 16 by the molded body removal device 14. It will be sent.

[0015] Figure 2 is a schematic plan view showing an example of a blow molding apparatus 2. Figure 3 shows the molding unit 22 This is a schematic diagram showing an example of the configuration. The blow molding apparatus 2 consists of multiple (12 in this embodiment) Using the mold 20, blow fluid is supplied into the preform 3 which is held in the mold 20. The blow molding process to form a hollow molded body 4 is repeated for each mold 20. In terms of form, the blow fluid is described as air, but any other fluid is also possible. It can be a gas or a liquid.

[0016] The blow molding apparatus 2 has a rotary unit 21 and a rotary as its main components. Multiple (12 in this embodiment) units arranged at predetermined intervals on the circumferential orbit of unit 21 The system includes a molding unit 22 and a control unit 23 that controls various parts of the blow molding apparatus 2.

[0017] The rotary unit 21 is formed, for example, in a disc shape and supports a plurality of molding units 22. A rotary support unit 210, and a rotary support unit 210 that rotates at a predetermined rotational speed (rotational period). It includes a rotating mechanism 211 for turning.

[0018] Each of the multiple molding units 22 has a mold support mechanism 22 that supports the mold 20 so that it can be opened and closed. 0 and a seal support part 221 that supports the preform 3, which is held in the mold 20, in a sealed state. , a stretch rod 2 is inserted into the preform 3 which is supported by the seal support portion 221. 22 and a stretch rod support mechanism that supports the stretch rod 222 so that it can move forward and backward. 223 and a blower that supplies or discharges blow fluid (air) to the stretch rod 222. It includes a low fluid supply and discharge section 224 and a temperature control mechanism section 225 for adjusting the temperature of the mold 20.

[0019] The blow fluid supply and discharge section 224 is in contact with the stretch rod 222 via the seal support section 221. The main pipe 2240 is connected, and three branch pipes 2241A~ are branched from the main pipe 2240. It is provided in 2241C and in branch piping 2241A connected to a low-pressure pre-blow air supply source. A pre-blow valve 2242 and a branch pipe 2 connected to the high-pressure main blow air supply source. The main blow valve 2243 located in 241B and the branch pipe 2 connected to the exhaust system An exhaust valve 2244 provided in 241C and the main piping 2240 or seal support part 221 It is equipped with a pressure sensor 2245. The pressure sensor 2245 is located within the preform 3. The pressure of the supplied blow fluid (pre-blow air, main blow air, blow air exhaust) It functions as a pressure measuring unit capable of measuring at predetermined measurement time intervals, and the measurement results are recorded at each point in time. Outputs the pressure measurement value.

[0020] Note that in Figures 2 and 3, the rotating mechanism 211, the mold support mechanism 220, and the seal support 2 The specific configuration of 21 and the stretch rod support mechanism 223 is omitted, but for example, Modules for generating driving force such as servo motors and cylinders, linear guides, and ball screws. Drive force transmission mechanisms such as gears, cams, belts, couplings, and bearings, and linear sensors, etc. It is configured by appropriately combining sensors such as an NCOR sensor and a limit sensor. Figures 2 and 3 omit the specific configuration of the temperature control mechanism 225, but for example, electric heater It is composed of a combination of temperature control modules such as a thermometer and sensors such as a temperature sensor. ru.

[0021] Figure 4 is a block diagram showing an example of a blow molding apparatus 2. The control unit 23 is a blow molding apparatus. The modules and sensors provided by the Tali unit 21 and the multiple molding units 22 and the electrical It is connected to and comprehensively controls the rotary unit 21 and the multiple molding units 22. It functions as a control unit. Figure 4 shows a pre-blow valve as part of a module group. 2242, the main blow valve 2243 and the exhaust valve 2244, and as part of the sensor group The pressure sensor 2245 is shown in the diagram, but the other module groups and sensor groups are omitted from the diagram. It's an abbreviation.

[0022] The control unit 23 consists of, for example, a general-purpose or dedicated computer. The main components of unit 23 are a control unit 230, a communication unit 231, and an input unit 232 It also includes an output unit 233 and a storage unit 234.

[0023] The control unit 230, for example, controls the arithmetic processing unit (CPU, MPU, GPU, etc.) and It is composed of a sequencer. The control unit 230, for example, stores blown components stored in the storage unit 234. By executing the molding program 2340, the blow molding control unit 2300 and burst monitoring are activated. It functions as part 2301 and the rejection control unit 2302. Details of each part 2300~2302 This will be explained later.

[0024] The communication unit 231 is connected to a communication network, for example, the device user of the blow molding apparatus 2. Terminal equipment (not shown) used by operators and managers, etc., and production of container molding system 1 A communication interface for sending and receiving various data with the production control device (not shown) that performs the management. It functions as a control. The input unit 232 is used for various input operations by the user of the blow molding apparatus 2. In addition to receiving the signal, the output unit 233 communicates via the display screen, signal tower illumination, and buzzer sound. By outputting various information to the device user, it functions as a user interface. .

[0025] The memory unit 234 stores various programs (operator) used in the operation of the blow molding apparatus 2. (Operating system (OS), blow molding program 2340, etc.) and data (device setting information 2) Stores (341 etc.). Device setting information 2341 indicates that the blow molding device 2 performs the blow molding process. This is information that allows you to register various operating conditions when executing an action, for example, the display screen (settings interface) It is configured to be editable by the device user via a (face).

[0026] (Regarding the blow molding control step by the blow molding control unit 2300) The blow molding control unit 2300 includes a rotary unit 21 and a plurality of molding units 22. The measured values ​​and detected values ​​of the sensor group are acquired, and the rotary unit 21 and multiple molding units The modules provided by 22 are operated, and the preform supply device 13 is used to supply preforms. The supply operation of Form 3 and the removal operation of the molded body 4 by the molded body removal device 14 are to be coordinated. Then, the blow molding process is repeated for every 20 molds.

[0027] The blow molding process is carried out by multiple units supported by the rotary support portion 210 of the rotary unit 21. Each of the molds 20 (molding units 22) rotates 360° along a circular orbit by the rotating mechanism 211. During the blow molding cycle (1 cycle) which rotates (1 revolution), as shown in Figure 2, (S1 (S2) Set preform 3, (S3) Close operation of mold 20, (S4) Stretch, (S4) (S5) Start of pre-blow air supply, (S6) Start of main blow air supply, Main blow pressure (S7) Force maintenance, (S8) Start of blow air exhaust, (S8) Opening operation of mold 20, (S9) Molded body 4 The process is executed in the order of retrieval.

[0028] In the blow molding process, the blow molding control unit 2300, in (S1), The preform 3 supplied from the base 2 is supported in a fixed state by the seal support part 221. In (S2), the mold support mechanism 220 closes the mold 20, and in (S3), The preform 3 is extended by moving the stretch rod 222 forward. (S4) The pre-blow valve 2242 opens to start supplying pre-blow air, and (S5) Then, while extending the stretch rod 222, the closing operation of the pre-blow valve 2242 and The main blow air supply is initiated by opening the main blow valve 2243. The low pressure is increased to the target pressure value, and the supply of the main blow air is continued in (S6). By doing so, the blow pressure is maintained at the pressure target value, and in (S7), the main blow valve 2243 The blow-up fluid is discharged by the closing operation of the valve and the opening operation of the exhaust valve 2244, thereby reducing the blow-up pressure. Lower it. (S8) While moving the stretch rod 222 outwards, the mold support The mechanism 220 opens the mold 20, and in (S9), the seal support 221 The fixed position of the molded body 4 is released, and the molded body 4 is removed from the seal support portion 221. Oh, in the blow molding process described above, the start timing (start angle) of each operation (S1~S9) The timing of the end (end angle) can be changed as appropriate, and other actions can be added. stomach.

[0029] Furthermore, the blow molding control unit 2300 monitors the pressure rise period (details) using the burst monitoring unit 2301. (Details will be explained later) It was detected that a burst occurred in the molded body 4 (actually, the molded body 4 in the process of being molded). Next, the supply of blow fluid to the molded body 4 is stopped. This prevents bursting. The degree of scattering of form 4 can be reduced.

[0030] (Regarding the burst monitoring step by the burst monitoring unit 2301) The burst monitoring unit 2301 monitors the burst of the molded body 4 during the blow molding process described above. The system monitors each mold 20 to determine whether a burst has occurred, and detects the occurrence of a burst among multiple molds 20. The mold 20 is identified as the burst-generating mold 20a.

[0031] Figure 5 is a graph showing the change in pressure measurements during the blow molding process. Figure 5 shows the horizontal axis. The rotation angle (time) of the rotary support part 210 is shown on the graph, with pressure on the vertical axis, and the normal pressure is shown on the graph. Force curve P1 (solid line), pressure curve P2 (dashed line) at the time of burst occurrence, and a buffer for burst monitoring. Lower limit curve P3 (dotted line), lower pressure limit value at each monitoring point for burst monitoring (upward) This diagram illustrates the triangle (pointing downwards) and the upper pressure limit (pointing downwards).

[0032] Pressure curves P1 and P2 are shown when the blow molding control unit 2300 performs the blow molding process. In other words, by starting the supply of blow fluid (pre-blow air, main blow air) The pressure rise period (S4) to (S5) during which the blowdown pressure is increased to the target pressure value, and the blowdown fluid The pressure maintenance period (S6) is during which the blow pressure is maintained at the target pressure value by continuing to supply the blow pressure, and Pressure reduction period: The pressure is reduced by stopping the supply of low fluid and discharging blow fluid. This is obtained when steps S7) and S7 are performed in order. Note that the pressure rise period is determined by the pre-blow air. The first pressure rise period due to supply, and the second pressure rise period due to the supply of main blow air. This period includes at least a second pressure increase period.

[0033] In that case, the burst monitoring unit 2301, for example, during the pressure rise period, the pressure sensor 22 At least one of the pressure measurements taken at each monitoring time interval by 45 is within the pressure limit. It monitors whether the pressure has fallen outside the acceptable range, and if the pressure measurement falls outside the acceptable range, it triggers a burst. Detects life. The monitoring time interval can be set to, for example, a fixed time interval (period). It is fine if they are set at different time intervals, or if multiple time points are set arbitrarily. This is also acceptable. The pressure tolerance range is at least one of the allowable lower limit and allowable upper limit of the pressure measurement value. This sets out the limits, and at least an acceptable lower limit is set during the pressure rise period.

[0034] Furthermore, the burst monitoring unit 2301 has the following operating conditions when monitoring the occurrence of a burst: At least one of the viewing time interval and monitoring time, and the pressure tolerance range are displayed on the screen (setting interface). It is configured to be configurable via a (face), for example, as part of the device configuration information 2341. It is stored in the memory unit 234. The burst monitoring unit 2301 detects when blow molding has been performed in the past. The ideal pressure curve when the system is running correctly (for example, stored in the memory unit 234 as historical data) Depending on the stored information, you may set the operating conditions for monitoring burst occurrences. The acceptable pressure range at each monitoring point is the blow pressure at each monitoring point in the ideal pressure curve. In contrast, the lower limit of the allowable value is generated by subtracting a predetermined allowable value or multiplying it by an allowable percentage value. It should be set according to -P3 (see Figure 5).

[0035] (Regarding the exclusion control step by the exclusion control unit 2302) The rejection control unit 2302 identifies the burst-generating mold 20a by the burst monitoring unit 2301. When this occurs, blow molding is performed using a plurality of molds 20, including the burst-generating mold 20a. The process is repeated for each mold 20, and the molded body 4 is discharged from the discharge line. The molded body 4 (hereinafter referred to as "rejected molded body 4a") formed in the rejection mold 20a is rejected. The rejection process is repeated.

[0036] Figure 6 shows an example of the operation of the rejection process. In Figure 6, the burst monitoring unit 2301 Of the 12 molds 20, the "5th" mold 20 is specifically designated as the burst-generating mold 20a. Let's explain the cases in which this is determined.

[0037] When performing the rejection process of the rejection molded body 4a, the rejection control unit 2302 performs, for example, rejection molding When body 4a is removed from the burst-generating mold 20a by the molded body removal device 14, A rejection instruction is sent to the shape removal device 14. Upon receiving the rejection instruction, the molded body removal device 14 The discarded molded body 4a is not on the molded body transport conveyor 15 (discharge line), but on the discarded conveyor 1 Transferred to line 6 (exclusion line).

[0038] Furthermore, the rejection control unit 2302 outputs notification information indicating that the rejection process has been initiated. The notification information includes, for example, the mold number indicating the burst-generating mold 20a (as shown in the example in Figure 6). This includes "5"). The output destination for the notification information is, for example, output unit 233 (display screen, etc. (The Gunal Tower lights up and a buzzer sounds), or a terminal device capable of communicating via the communication unit 231 ( (Not shown) The terminal device may be, for example, a portable or stationary device used by the device user. It is made up of computers.

[0039] Furthermore, the rejection control unit 2302 checks whether the termination condition for the rejection process has been met during the execution of the rejection process. The system monitors whether or not a burst has occurred, and when it detects that the termination condition has been met, it de-identifies the mold that caused the burst. At the same time, the execution of the rejection process is terminated. The rejection control unit 2302, for example, the input unit 232 and When the device user sends an input command via the terminal device to indicate the termination of the exclusion process, The system detects when the conditions for ending the rejection process have been met. Furthermore, a molded body inspection device (failure to complete the rejection process) is installed on the rejection conveyor 16. If a (illustrated) is installed, the rejection control unit 2302 will determine the molded body inspection device If a normal test result is received as a result of the inspection of item 4, the rejection process will be terminated. The condition may be detected as met. The rejection control unit 2302 may also perform rejection processing a predetermined number of times. If this occurs, the fulfillment of the termination condition for the exclusion process may be detected. A predetermined number of times, the display screen (settings This may be the number of times set by the device user via a fixed interface, or the number of times the device has been used in the past. The number of times the user has given input to terminate the exclusion process may also be used.

[0040] As described above, according to the blow molding apparatus 2 and blow molding method of this embodiment, multiple Of the molds 20, the mold 20 in which the occurrence of a burst was detected is designated as the burst-occurring mold 20a. When determined, blow molding is performed using multiple molds 20, including the burst-generating mold 20a. The process is repeated for each mold 20, and the mold is formed in the burst-generating mold 20a. Only the molded body 4a that has been processed is repeatedly discharged from the discharge line. Therefore, blow molding apparatus Since the molded body 4 is repeatedly formed using multiple molds 20 without the process 2 being stopped, Therefore, the molded body 4 can be continuously produced using molds 20 other than the burst-generating mold 20a. On the other hand, the ejection molded body 4a molded in the burst-generating mold 20a is formed by burst molding. The fragments of body 4 are transferred, resulting in a defective product, but since it is rejected from the discharge line, it is not considered a defective product. This prevents discharge to subsequent processes. Then, blow in the burst generation mold 20a. When the molding process is performed, fragments of the molded body 4 due to bursting are transferred to the rejecting molded body 4a. This removes the fragments of the molded body 4 that have scattered into the mold, thus preventing damage to the molded body 4 by the device user. The process of removing the fragments can be omitted or simplified. Therefore, defective products can be discharged to subsequent processes. This prevents the decline in production efficiency while also preventing the problem from occurring.

[0041] (Other embodiments) The present invention is not limited to the embodiments described above, and will proceed within the scope of the spirit of the invention. It is possible to implement various modifications within the system. And all of these are based on the technical ideas of the present invention. It is included in the idea.

[0042] In the above embodiment, the blow molding apparatus 2 comprises a plurality of rotary molding units 22. Although we have explained the case where this is possible, blow molding is performed using multiple molds 20 for each mold 20. If the process is repetitive, it may be applied to blow molding apparatus configured in a different manner.

[0043] In the above embodiment, the burst monitoring unit 2301 is based on the pressure measurement value of the pressure sensor 2245. Next, we explained how to monitor for burst occurrences, but instead of the pressure sensor 2245... Alternatively, the system can monitor for burst occurrences based on measurements or detections from other sensors. That's fine.

[0044] In the above embodiment, the blow molding apparatus 2 performs a blow molding process in one form of the molded object. We have described the case in which a biaxial stretch blow molding method is performed on a certain preform 3, Direct blow molding may also be performed on other forms of the shape, such as hollow parisons. Alternatively, other blow molding methods may be used. Also, the blow molding apparatus 2 is a hot parsing machine. The N method (also called the one-stage method) and the cold Parison method (also called the two-stage method) It is also acceptable to adopt this option.

[0045] In the above embodiment, the material of the molded body (preform 3) is polyethylene terephthalate. I explained the case of PET, but there are other types as well, such as polypropylene (PP) and PO Other thermoplastic resins such as ethylene naphthalate (PEN) may be used, and recycled resins may also be used. Materials may be used. Furthermore, the molded body (preform 3) can be molded in ways other than injection molding, for example, It may have any shape formed by any molding method such as PCM molding, or a single layer structure Either a single-layer or multi-layer structure may be adopted. [Explanation of symbols]

[0046] 1...Container molding system, 2...Blow molding machine, 3...Preform (workpiece), 4...Molded body, 4a...Exclusion molded body, 10...Injection molding device, 11...Preform removal device, 12…Preform conveyor, 13…Molded product conveyor, 14…Molded body removal device, 15…Molded body conveyor, 16…Rejection conveyor, 20...Mold, 20a...Burst-generating mold, 21...Rotary unit, 22...Molding unit, 23...Control unit, 210...Rotary support part, 211...Rotation mechanism part, 213...Stretch rod, 220...Mold support mechanism, 221...Seal support, 222...Stretch rod, 223...Stretch rod support mechanism, 224...Blow fluid supply and discharge section, 225...Temperature control mechanism section, 230...Control unit, 231...Communication unit, 232...Input unit, 233...Output unit, 234...Storage unit, 2240...Main piping, 2241A~2241C...Branch piping, 2242... Pre-blow valve, 2243... Main blow valve, 2244... Exhaust valve, 2245... Pressure sensor, 2300...Blow molding control unit, 2301...Burst monitoring unit, 2302...Rejection control unit, 2340...Blow molding program, 2341...Device setting information

Claims

1. A blow molding apparatus that uses multiple molds and repeatedly performs a blow molding process for each mold, in which blow fluid is supplied into a molded body held between the molds to form a hollow molded body, A burst monitoring unit monitors whether or not a burst has occurred in the blow molding process for each mold, and identifies the mold in which a burst has occurred as the burst-occurring mold among a plurality of molds. When the burst-generating mold is identified, the blow molding process is repeatedly performed for each of the multiple molds, including the burst-generating mold, and the system also includes a discharge control unit that repeatedly performs a discharge process to discharge the molded body formed in the burst-generating mold from a discharge line for discharging the molded body. The aforementioned rejection control unit, During the execution of the rejection process, whether or not the termination conditions for the rejection process have been met is monitored by whether or not an input operation from the device user instructing the termination of the rejection process has been received, or by whether or not a normal inspection result has been received as a result of inspecting the molded body by the molded body inspection device. While the fulfillment of the aforementioned termination condition is not detected, the identification of the burst-generating mold is not released, and the execution of the rejection process continues. When the aforementioned termination condition is detected, the identification of the burst-generating mold is released, and the execution of the rejection process is terminated. Blow molding machine.

2. The aforementioned rejection control unit, Outputs notification information indicating that the execution of the aforementioned rejection process has begun. The blow molding apparatus according to claim 1.

3. A blow molding method in which a blow molding process is repeatedly performed for each mold, using multiple molds, to supply blow fluid into a molded body to be held between the molds, thereby forming a hollow molded body. A burst monitoring step involves monitoring whether a burst occurred in the blow molding process for each mold, and identifying the mold in which the burst occurred as the burst-occurring mold among a plurality of molds. When the burst-generating mold is identified, the blow molding process is repeatedly performed for each mold using a plurality of molds including the burst-generating mold, and a rejection control step is repeatedly performed to reject the molded body formed in the burst-generating mold from the discharge line for discharging the molded body. The aforementioned rejection control step is: During the execution of the rejection process, whether or not the termination conditions for the rejection process have been met is monitored by whether or not an input operation from the device user instructing the termination of the rejection process has been received, or by whether or not a normal inspection result has been received as a result of inspecting the molded body by the molded body inspection device. While the fulfillment of the aforementioned termination condition is not detected, the identification of the burst-generating mold is not released, and the execution of the rejection process continues. When the aforementioned termination condition is detected, the identification of the burst-generating mold is released, and the execution of the rejection process is terminated. Blow molding method.

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