JPH0272930A - Manufacturing system for synthetic resin vessel - Google Patents

Abstract

PURPOSE:To improve the conforming article rate of products, and reduce the time for measuring the wall thickness by measuring continuously the wall thickness molded by a synthetic resin vessel molding apparatus by means of a continuously automatic wall thickness inspection device, and controlling by feed back the synthetic resin vessel molding apparatus on the basis of the measured data. CONSTITUTION:Driving rotating rollers 46 rotate, following this, a PET vessel 18 and two following rollers 47 rotate, simultaneously, an insertion pipe 12 is inserted into the PET vessel 18 by means of an insertion pipe coming up and down control unit 13. When the rotating speed of the PET vessel reaches a certain rotating speed, a main control unit 9 commands to start the wall thickness measurement. The infrared rays (wavelength 2-5mum) projected from a projecting unit 14 pass through the inner part of the insertion pipe 12, and reaches a sensor light receiving unit 15 after absorbed in its a part by the body wall of the PET vessel 18, and converted into an electric signal, and outputted then to a main control unit 9 via an IF control unit 10. On the other hand, the control unit 3 of a molding apparatus 2 received the wall thickness data may control the molding conditions on the basis of the data.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a synthetic resin container manufacturing system, and particularly to a manufacturing system for polyethylene terephthalate resin containers (hereinafter referred to as PET containers).

[Conventional technology]

The principle of a conventional synthetic resin container manufacturing system will be explained with reference to FIG.

A conventional container manufacturing system includes a raw material supply device 1 that supplies synthetic resin raw materials, a molding device 2 consisting of an injection molding device and a blow molding device, a control device 3 that controls molding conditions of the molding device, and inspects the molded PET container. Bottle inspection device 4
And a sorting device 6 that separates good and defective PET containers.
It's getting better.

A synthetic resin raw material is supplied from a raw material supply device 1 to a molding device 2, which molds a parison by injection molding, and molds the molded parison into a container shape by stretch blow molding. The molding conditions of these molding devices are controlled by a control device 3.

Next, the bottle inspection device 4 inspects whether the bottle is suitable or not, and based on the result, the sorting device 6 sorts out good products and defective products.

In addition, the wall thickness of the bottle was inspected using a wall thickness inspection device through regular sampling, and loft management was carried out.

FIG. 9 shows an overview of a conventional wall thickness inspection device 60.

The wall thickness inspection device 60 includes a light source unit 6 that generates infrared radiation for measurement.
9, a light projecting section 71 that is inserted into the PET container 66 and emits measurement infrared rays 70 onto the body wall of the PET container 66; The light receiving section 72 disposed in such a manner that the light receiving section 72 is arranged to It consists of a lifting device 74 that raises and lowers the PET container 66, and a rotating device 75 that rotates the PET container 66 in its circumferential direction.

Next, the operation of the conventional wall thickness measuring device described above will be explained.

First, the PET container 66 to be subjected to lPj is placed in the rotating device 7.
5, the light emitting part 71 and the light receiving part 72 are lowered together by the elevating device 74, the light emitting part 71 is inserted into the PET container 66, and the light emitting part 71 is stopped at a predetermined measurement position. Then P.E.
Measurement infrared rays 70 generated by six light sources are emitted onto the body wall of the T container 66, transmitted through the body wall of the PET container 66, absorbed, converted into an electrical signal by the light receiving unit 72, and sent to the arithmetic processing unit 72. Output. The arithmetic processing unit 72 calculates the wall thickness of the measured portion of the PET container 66 based on the output signal, and ends the 7111 determination.

[Problem to be solved by the invention]

In the above-mentioned conventional synthetic resin container manufacturing system, the wall thickness is newly measured by sampling after the molding inspection on the production line is completed to determine pass/fail, so the wall thickness data cannot be fed back to the production line. Furthermore, it is impossible to inspect all the parts, and it takes a lot of time and effort to measure wall thickness data.

Therefore, the present invention provides a synthetic resin container manufacturing system that continuously determines the wall thickness of PET containers in the manufacturing line, feeds back the container wall thickness data to the molding equipment, and reduces the labor of wall thickness measurement. The purpose is to provide.

[Means to solve the problem]

In order to solve the above problems, the present invention provides a continuous automatic wall thickness inspection device in the production line in a synthetic resin container manufacturing system for molding synthetic resin containers and product inspection. The continuous automatic wall thickness inspection device continuously measures the wall thickness of the container molded by the method, and the synthetic resin container molding device is feedback-controlled based on the measurement data.

[Effect]

By installing an automatic continuous wall thickness measuring device in the production line, the synthetic resin container manufacturing system can measure the wall thickness of the synthetic resin container immediately after molding and feed it back to the control device of the molding equipment, making it possible to It is possible to increase the rate of non-defective products and reduce the effort required to measure wall thickness.

〔Example〕

Embodiments of the present invention will be described with reference to FIGS. 1 to 7.

FIG. 1 shows a diagram explaining the principle of the present invention.

The synthetic resin container manufacturing system M includes a raw material supply device 1 that supplies synthetic resin raw materials, a molding device 2 consisting of an injection molding device and a blow molding device, a control device 3 that controls molding conditions of the molding device, and a molded PET container. It consists of a bottle inspection device 4 for inspecting, a continuous automatic wall thickness inspection device 5 for automatically and continuously measuring the wall thickness of PET containers, and a sorting device 6 for sorting out good and defective PET containers.

The difference from the conventional example shown in FIG. 8 is that a continuous automatic wall thickness inspection device 5 is provided between the bottle inspection device 4 and the sorting device 6, which measures the wall thickness immediately after molding and data Since the information can be fed back, it is possible to quickly respond to the molding process.

The raw material supply device 1 is configured to supply a polyethylene terephthalate synthetic resin as a main resin and a heat-resistant resin (as a co-injection resin).
A mixed resin of a polyarylate resin (for example, a polyarylate resin) and an ultraviolet absorbing resin (for example, a benzotriazole resin) is supplied to a molding device.

The molding device 2 consists of an injection molding device and a blow molding device. The parison sent to the blow molding device is stretch blow molded and processed into the shape of a container.The molding conditions of these molding devices are controlled by a control device 3.

Next, the synthetic resin container molded by the molding device 2 is sent to a bottle inspection device 4.

As shown in FIG. 2, the continuous automatic wall thickness measuring device 5 includes a control calculation section 7 that performs overall control and data calculation processing, and an inspection section 8 that inspects wall thickness.

Control ia1] The calculation unit 7 is a main control unit 9 that controls the entire device.
, an interface control section (IF control section) 10 that controls data exchange with the inspection section 8, etc., and an arithmetic processing section 11 that performs data arithmetic processing.

The inspection section 8 includes an insertion tube 12 inserted into the PET container, an insertion tube elevation control section 13 that inserts the insertion tube 12 into the PET container and takes it out from the PET container, a light source section 16 that generates infrared radiation for measurement, A light projecting section 14 that projects infrared rays for measurement into the insertion tube 12, a sensor light receiving section 15 that converts the amount of transmitted infrared rays that passed through the insertion tube 1.2 and passed through the body wall of the PET container into an electrical signal using a sensor, and the PET container. The PET container is transported from the transport conveyor to the inspection position, and the PET container is
It consists of a container conveyance rotating section 17 that rotates the T container in the circumferential direction.

The insertion tube 12 has a cylindrical shape, and the insertion tube elevation control section 1
3 into the PET container 18 to be measured, and guides the measuring infrared ray 19 into the PET container 18.

FIG. 3 shows an outline of the sensor light receiving section 15.

The sensor light receiving section 15 includes a casing 20, an interference filter 21 that cuts infrared rays outside a specific frequency range, and PbS (lead sulfide) that converts into an electrical signal according to the amount of incident infrared rays.
The infrared sensor 22, the electronic cooling element 23 built into the PbS infrared sensor to keep the ambient temperature of the PbS infrared sensor 22 constant, the amplification amplifier 24 that amplifies the output signal of the PbS infrared sensor 22, the PbS infrared sensor 22, and the amplification amplifier. 24, an output connector 26 for outputting the output signal amplified by the amplifier 24, and the electronic cooling element 23.
It consists of a cooling control connector 27 for controlling.

The interference filter 21 has a center transmission wavelength of approximately 2.6 μm, and the amount of infrared light transmitted through the interference filter 21 is P.
The signal is converted into an electrical signal by the bS quantum infrared sensor 22, amplified by the amplification amplifier 23, and output to the main control unit 9 via the IF control unit 10.

At this time, in order to operate the PbS infrared sensor 22 stably, the temperature near the PbS quantum infrared sensor 22 is kept at about 10 degrees Celsius by the electronic cooling element 23 that utilizes the Peltier effect.
It is kept in

FIG. 4 shows an outline of the light source unit]-6 and the light projecting unit 14.

The light source section 16 includes a casing 28, a light source 29, a concave mirror 30 located above the light source 29, a chopper 31 located below the two light sources, and a planar heating element 32. is located. For the light source 29, one that emits infrared rays, such as a nichrome wire, is used. It is desirable to use infrared light with a wavelength of 2 to 5 μm.

The concave mirror 30 is for condensing infrared rays from a light source.

The chopper 31- includes a chopper plate 33 and a rotating motor 3.
4, which chops the infrared light focused by the concave mirror 30 to make it into intermittent light (alternating waveform).

The reason why chopping is performed is that drift and offset occur due to the characteristics of the Pb5ffi infrared sensor 22, so it is converted to an alternating waveform to remove fluctuation factors such as drift and offset, and perform highly accurate measurement. It is for the purpose of doing. As the type of chopper, a mechanical type as in this embodiment, an electric type that chops the light source electrically, etc. can be considered.

The planar heating element 32 is provided on the entire surface or several surfaces of the casing 28, and is provided to keep the temperature inside the casing 28 constant, thereby suppressing fluctuations of the light source 29 and maintaining measurement stability. There is.

Thereby, the temperature inside the casing 28 is controlled to be maintained at approximately 40°C.

The light projection unit 14 is composed of a reflecting mirror 35 and a lens group 36, and transmits the infrared rays generated by the light source 29 to the insertion tube 12 as parallel light.

FIG. 5 shows an outline of the container conveyance rotation section 17.

The container conveyance rotation unit 17 includes a turntable 37, four gripping parts 38 provided at every 90 degrees on the turntable, and four gripping parts 38 for gripping and opening the PET container. a suppression section 39 for opening the section, and a suppression cylinder section 40 for operating the three suppression sections.
It becomes more.

Further, the turntable 37 has PE in its diameter direction.
Conveyors 41, 42 for carrying in and carrying out T-containers are connected.

The grip part 38 is a grip body 138 consisting of a pair of three arm parts for gripping and opening the PET container by opening and closing operations.
This gripping body 138 includes a clamp arm portion 43,
An opening/closing arm portion 44 that is pressed by the pressing portion 39 to open and close the clamp arm portion 43, and a return spring 4 that provides an urging force to close the clamp arm portion 43.
8 is attached, and this return arm part 45 comes into contact with a return position adjustment screw 49 at the time of return. In addition, there is a PET between the pair of grips 138 during measurement.
A driving rotating roller 46 for rotating the container is provided, and two driven rotating rollers 47 are attached to the tip of the clamp arm section 43 and working together with the driving rotating roller 46 to rotate the PET container. .

Next, the operation will be explained with reference to the flowchart shown in FIG.

Inspection Preparation First, in order to ensure measurement stability, the light source 29 and sensor light receiving section 15 are preliminarily operated (step Sl).
.

When the PET container 18 is carried into the introduction position 91 by the PET container carrying-in conveyor 41 and this introduction is confirmed by a position detection sensor (not shown) (step S2), the pressing part 39 is moved by the pressing cylinder part 40. PE operating automatic continuous wall thickness inspection device
The opening/closing arm portion 44 of the gripper 138 at the T-container introduction position 91 is pressed by the pressing portion 39, and the clamp arm portion 43 is thereby pushed apart about the pin 100 against the biasing force of the return spring 48. At the same time, the return arm portion 45 separates from the four return position adjusting screws.

Next, while maintaining the expanded state, insert PET container 1.
8 into the pair of gripping bodies 138 by the conveyor 41 for carrying in, and when it is confirmed by a position detection sensor (not shown) that the PET container 18 has been introduced to the position where it contacts the driving rotation roller 46. , the suppression part 39 stops pressing, and the return arm part 45 comes into contact with the return position adjustment screw position 49 due to the biasing force of the return spring 48, and the PET container 18 is moved against the driving rotation roller 46 and the driven rotation roller 47. .47, it is securely gripped (step S3).

Next, the turntable 37 rotates clockwise in the drawing, and P
The ET container 18 is conveyed to the inspection position 92 while being held, and the turntable 37 stops rotating (step S4).

Thick? The #1 constant drive rotating roller 46 rotates, and accordingly the PET container 90 and the two driven rotating rollers 47 rotate (Step S5), and at the same time, the insertion tube 12 is inserted into the PET container 18 by the insertion tube elevation control section 13. (Step S6)
. When the rotation speed of the PET container reaches a certain rotation speed, the main control unit 9 instructs to start wall thickness measurement (step S
7).

The infrared light (wavelength 2 to 5 μm) emitted from the light projecting section 14 passes through the insertion tube 12, is partially absorbed by the body wall of the PET container 18, reaches the sensor light receiving section 15, and is converted into electricity by the sensor light receiving section 15. It is converted into a signal and output to the main control section 9 via the IF control section 10 (step S8).

The arithmetic processing main control section 9 transfers the output signal data to the arithmetic processing section 11 and instructs it to convert the output signal data into wall thickness data. Based on the relationship shown in FIG. 7, the arithmetic processing section 11 converts the output signal data corresponding to the measured amount of infrared rays into wall thickness data, and outputs the data to the main control section 9 (step S9). The main control unit 9 outputs wall thickness data to the control device 3 of the molding device 2 via the IF control device 10 (step 510).

Pulling out the insertion tube After that, the insertion tube elevation control unit 13 pulls out the insertion tube [2] (Step 511), the drive rotation roller rotation motor stops rotating, and the PET container 18 stops rotating (Step 5).
12).

After the PET container is carried out, the turntable rotates again while gripping the PET container 18, and stops rotating when the grip portion 38 reaches the discharge position 93 (step 813).

The suppressing cylinder section 40 operates and the three suppressing sections press the opening/closing arm section 44 of the gripping body 138, so that the clamp arm section 43 pivots the bottle 100 against the biasing force of the return spring 48. The container is opened (step 514). At the same time, the return arm portion 45 separates from the return position adjustment screw 49.

Next, the PET container is transported out of the clamp arm section 43 by the transport conveyor 42 while maintaining the expanded state (step 515).

When a position detection sensor (not shown) confirms that the PET container 18 has been discharged to a predetermined position, the suppression cylinder section 40 stops operating, the three suppression sections stop pressing, and the return cylinder section 40 stops operating. Due to the biasing force of the spring 48, the return arm portion 45 comes into contact with the four return position adjustment screws, and the clamp arm portion 43 is closed. Then turntable 3
7 rotates again and repeats the above operation.

Incidentally, the PET container 18 is conveyed to the next process by an unloading conveyor 42.

Feedback control On the other hand, the control device 3 of the molding device 2 that has received the wall thickness data controls the molding conditions based on the data. Since the wall thickness data of PET containers can be automatically and continuously measured in the resin container manufacturing system, the wall thickness data can be immediately fed back to the molding process, and the time and effort of wall thickness measurement can be reduced.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the principle of the synthetic resin container manufacturing system of the present invention, Fig. 2 is a schematic diagram of the continuous automatic wall thickness inspection device of the present invention, and Fig. 3 is a schematic diagram of the sensor light receiving section of the present invention. FIG. 4 is a schematic diagram of the light source section and light projecting section of the present invention, FIG. 5 is a schematic diagram of the container conveyance rotation section of the present invention, FIG. 6 is a processing flowchart of the present invention, and FIG. 7 is a diagram of sensor light reception of the present invention. FIG. 8 is a diagram explaining the principle of a conventional synthetic resin container manufacturing system, and FIG. 9 is a schematic diagram of a conventional wall thickness inspection device. DESCRIPTION OF SYMBOLS 1... Raw material supply device, 2... Molding device, 3... Control device, 4... Bottle inspection device, 5... Continuous automatic wall thickness inspection device, 6... Sorting device, 7. ...control calculation section,
8... Inspection section, 9... Main control section, 10... Interface control section, 11... Arithmetic processing section, 12... Insertion inspection section, 13... Insertion inspection section elevation control device, 14・
... Light projecting section, 15... Sensor light receiving section, 16... Light source section, 17... Container transport rotation section, 18... PET container, 19... Infrared rays for measurement, 20... Casing ,2
1... Interference filter 22... PbS infrared sensor, 23... Electronic cooling element, 24... Amplification amplifier, 2
8... Casing, 29... Light source, 30... Concave mirror, 31... Chopper, 32... Planar heating element, 33
...Chopper board, 34...Rotation motor, 35...
・Reflector, 36... Lens group, 37... Turntable, 38... Gripping part, 39... Pressing part, 40...
・Press cylinder part, 41... Carrying conveyor, 42
... Carrying out conveyor, 43... Clamp arm section,
44... Opening/closing arm part, 45... Returning arm part,
46... Drive rotation roller, 47... Driven rotation roller, 48... Return spring, 49... Return position adjustment screw, 91... Introduction position, 92... Inspection position, 9
3... Discharge position.

Claims (1)

[Claims] In a synthetic resin container manufacturing system that includes a synthetic resin container molding process and a product inspection process, a continuous automatic wall thickness inspection device is installed in the production line to check the wall thickness of containers molded by the synthetic resin container molding device. A synthetic resin container manufacturing system, characterized in that the continuous automatic wall thickness inspection device continuously measures the thickness, and the synthetic resin container molding device is feedback-controlled based on the measurement data.