EP3322974A1 - Inspektionsvorrichtung für einen vorformling - Google Patents
Inspektionsvorrichtung für einen vorformlingInfo
- Publication number
- EP3322974A1 EP3322974A1 EP16725133.9A EP16725133A EP3322974A1 EP 3322974 A1 EP3322974 A1 EP 3322974A1 EP 16725133 A EP16725133 A EP 16725133A EP 3322974 A1 EP3322974 A1 EP 3322974A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- camera
- inspection
- preform
- inspection device
- beam splitter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/90—Investigating the presence of flaws or contamination in a container or its contents
- G01N21/9081—Inspection especially designed for plastic containers, e.g. preforms
Definitions
- the invention relates to an inspection device for the optical inspection of an orifice and a bottom region of a preform with the features of the preamble of claim 1.
- preforms made of a thermoplastic material are usually produced by means of an injection molding process and then shaped by means of a stretch blow molding process into ready-to-use containers.
- various inspection devices are already known which are used either directly after the production of the preform or immediately before the conversion into the ready-to-use container.
- various defects of the preform e.g. the sealing surface, the support ring, the bottom, the side wall, the screw thread or general deviations, such as color, etc. controlled.
- the full inspection is usually carried out directly after the production of the preform.
- the preform is again partially checked after its transport and eventual storage in order to detect any defects that have arisen before the stretch blow molding process.
- the partial inspection for example, the ovality of the sealing surface, scratches on the sealing surface and / or a deflection of the preform are inspected.
- a disadvantage of the known inspection devices is that they are technically complex in a pure mouth and bottom inspection and a correspondingly large space must be provided. As a result, the known inspection devices are relatively expensive.
- the invention provides an inspection device for optically inspecting an orifice and a bottom portion of a preform having the features of claim 1.
- the inspection device comprises the first camera for inspection of the muzzle and the second camera for ground inspection, both the mouth region and the bottom region can be controlled in the same way.
- the illumination unit is designed for epi-illumination of the muzzle region and transmitted-light illumination of the base region, the illumination on one side of the preform can be made particularly compact.
- the preform is illuminated from the side of the mouth region and the light reflected from the preform is detected by the first camera for inspecting the mouth region. Since the light of the lighting unit also passes through the preform in the direction of the floor area, it then appears in the transmitted light for the second camera.
- the floor inspection can be performed without the need for a dedicated lighting unit.
- the lighting unit is particularly compact and therefore inexpensive.
- the inspection device can be arranged in a beverage processing plant.
- the inspection device can be arranged downstream of an injection molding plant for the production of preforms and / or a storage space for preforms and / or upstream of a container production plant (for example a stretch blow molding machine).
- the stretch blow molding machine can be designed to convert preforms into ready-to-use containers.
- the preforms may be provided as intermediates for the manufacture of containers adapted to contain beverages, foodstuffs, hygiene articles, pastes, chemical, biological and / or pharmaceutical products.
- the containers that can be produced from the preforms can be plastic bottles.
- the preforms can be made of a plastic material such as PET, PEN, HD-PE or PP and / or produced with an injection molding machine.
- the mouth region of the preform may comprise a sealing surface and / or a thread for closing the container by means of a container closure.
- the preform may comprise a support ring for transporting the preform and / or the container produced therefrom.
- the preform may comprise a hollow body adjoining the mouth region, in particular a cylindrical one. The hollow body may be closed at an end opposite the mouth region by a bottom which surrounds the Floor area forms. The bottom portion may have an injection point that is formed due to a material supply channel in the injection mold for the plastic.
- the transport device may be formed with receptacles each for receiving a preform.
- the receptacles for holding the side of the support ring at the mouth region of the preform are formed so that the preform is freely accessible in the axial direction from both sides.
- the transport device may comprise a linear conveyor or a carousel, on which particular additional treatment or inspection devices for the preform are arranged. In other words, the transport device can also connect several parts of the system.
- the first and second camera can each comprise an image sensor, for example a CCD or CMOS sensor, an evaluation electronics for reading the image sensor and / or a data interface.
- the first and second camera can each be formed with a lens for imaging the mouth or bottom area on the image sensor.
- the first and second camera can have or be connected to an image processing unit for detecting defects at the mouth or bottom area of the preform. This makes it possible to process the image data either in the respective cameras or in the external image processing unit and thereby detect the defects.
- At least one of the cameras can be designed as a color camera.
- the second camera can be arranged opposite the first camera.
- the lighting unit can be designed for simultaneous reflected light illumination of the mouth region and transmitted light illumination of the bottom region.
- the lighting unit may comprise a light source, for example one or more light bulbs, fluorescent tubes, arc lamps or semiconductor light sources such as LEDs or laser diodes.
- the light source can produce narrowband monochromatic light or broadband eg white light.
- the light source may also generate monochromatic light at two or more wavelengths simultaneously, preselectably or sequentially one after the other. This allows the evaluation of the coloring of the preform and the transmitted light inspection in the optimally transparent spectral range.
- the illumination unit may preferably have a substantially uniformly emitting light exit surface.
- the bottom area of the preform appears from the direction of view of the second camera in front of the uniformly emitting light exit area and can thus be detected particularly well.
- the lighting unit may comprise a plurality of LEDs with a diffuser element connected in front of it.
- the illumination unit with the uniformly radiating light exit surface is particularly compact and inexpensive.
- the uniformly radiating light exit surface can be larger than one maximum cross-sectional area of the preform. As a result, the preform is completely illuminated in transmitted light and can thus be inspected particularly well by the second camera.
- the light source can also be designed so that successively different light exit surfaces are switched on or off, eg an annular light exit surface for the inspection of the mouth region and a flat, in particular circular or rectangular light exit surface for the inspection of the bottom area. This can be achieved, for example, by switching on and switching off individual LEDs arranged in a matrix.
- the lighting unit can be designed to emit flashes of light, which prevents blurring of the camera images, for example by a transport movement of the preforms. As a result, the image recording can take place both on the stationary preform or during a transport movement.
- the first and second camera can be triggered by the illumination unit to emit the light flashes, so that the camera images are recorded simultaneously with the delivery of the light flashes.
- the cameras are easily synchronized with the flashes of light.
- very briefly successively triggered light flashes for example, ⁇ 2ms, different shape or wavelength, the two cameras with different, optimized to the application lighting can be triggered during the transport movement of the preform quasi at the same place.
- the objectives of the first and / or second camera can be formed telecentrically on the side of the preform. Telecentric can mean here that the magnification of the lens along the optical axis remains constant on the side of the preform. As a result, different areas of the preform always have the same scale in the depth of the camera image and thus do not obscure themselves. Furthermore, size comparisons of different areas of the preform are possible.
- the two cameras and the illumination unit can be arranged on the transport device such that a transport direction of the transport device runs essentially perpendicular to the optical axes of the cameras and perpendicular to the emission direction of the illumination unit.
- a transport direction of the transport device runs essentially perpendicular to the optical axes of the cameras and perpendicular to the emission direction of the illumination unit.
- the optical axes of the cameras or the emission direction of the illumination unit may have an offset from each other or coincide in an intersection.
- the inspection device may comprise a beam splitter, so that the beam path of the illumination unit and the beam path of the first camera extend over the beam splitter, in particular particular wherein the two beam paths are aligned parallel to each other or coaxially on the preform.
- This makes it possible that the lighting and the muzzle inspection is carried out substantially from the same direction.
- defects at the mouth area appear particularly rich in contrast.
- beam paths here is meant in each case the course of the light rays which are radiated from the illumination unit to the preform or which are reflected back from the preform in the direction of the first camera.
- the beam paths may each include reflections and refractions on optical components of the inspection device, in particular on the beam splitter.
- the beam splitter may comprise a layer which is partially transmissive and partially reflective.
- the layer is formed such that 50% of light transmitted and 50% reflected.
- other reflection transmission ratios of the beam splitter are conceivable, such as 60:40, 70:30, 80:20, 90:10 or vice versa.
- the beam splitter can be designed so that the reflection / transmission ratio is dependent on the wavelength of the light, that is, for example, the blue component reflects more strongly and the red one transmits more strongly.
- the beam splitter may be plate-shaped, wedge-shaped or cube-shaped.
- the beam splitter consists of a glass or plastic material as a support for the layer.
- the surface of the beam splitter formed with the aforementioned layer can be arranged at an angle, preferably 45 °, to the optical axis of the camera or to the illumination unit.
- the fact that the illumination and the mouth inspection on the preform are aligned parallel to each other or coaxially may mean here that the optical axes of the illumination unit and the first camera are aligned parallel to each other or coaxially before / after the deflection by the beam splitter in the area of the preform.
- the beam splitter can be arranged during the inspection between the mouth region and the first camera or between the mouth region and the illumination unit. In other words, the beam splitter can be arranged between an inspection position provided for the inspection of the preform and the first camera or between the inspection position and the illumination unit.
- the beam splitter can preferably be arranged such that the illumination with the illumination unit takes place via a reflection at the beam splitter and the mouth inspection with the first camera via a transmission through the beam splitter.
- the second camera can be arranged opposite the first camera, so that the preform is located exactly between the two cameras during the inspection. The lighting is thus coupled via the beam splitter.
- the beam splitter may be arranged such that the illumination with the illumination unit takes place via a transmission through the beam splitter and the mouth inspection with the first camera takes place via a reflection at the beam splitter. Accordingly, therefore, the second camera is arranged opposite to the illumination unit.
- the optical axes of the first and the second camera can extend along their optical path substantially on a common inspection axis, which runs in the region of the preform substantially parallel or coaxial to the longitudinal axis of the preform during the inspection, so that the first camera with viewing direction are aligned with the mouth area and the second camera facing the ground area.
- the beam splitter may here be arranged on the common inspection axis between the first camera and the mouth region of the preform, so that it couples in the light of the illumination unit in reflection onto the inspection axis.
- the transport device can be designed to transport the preforms transversely to the inspection axis. As a result, no special alignment or movement of the preform is necessary for inspection.
- the preform can be received in the transport device in such a way that, during the inspection, it is aligned with its longitudinal axis substantially parallel or coaxially to the inspection axis.
- Fig. 1 shows an embodiment of the inspection device in a side view.
- FIG. 1 shows a side view of the inspection device 1 for optically inspecting the mouth region 2a and the bottom region 2b of the preform 2. Only partially visible is the transport device 3 with a receptacle for the preform 2.
- the transport device 3 may comprise, for example, a star conveyor, a carousel or a linear conveyor unit.
- the receptacle engages, for example, on the support ring 2e and transports the preform 2 perpendicular to the image plane in the transport direction R, ie transversely to the inspection axis I. It is also conceivable that the transport direction R perpendicular to the optical axes A, B of the cameras 4, 5 and perpendicular to the emission direction of the illumination unit 6 (optical axis C) extends.
- the optical axes A, B, C may be offset from one another or intersect at an intersection.
- the first camera 4 can be seen, which is aligned with its optical axis A perpendicular to the mouth region 2 a of the preform 2.
- scratches and dents in the area of the sealing surface 2c are detected with particularly high contrast and can therefore be reliably evaluated.
- the orifice diameter can be measured or an ovality of the sealing surface 2c can be detected and thus concluded that the preform is deformed.
- other errors such as insufficient material or inclusions in the sealing surface area can be detected.
- the second camera 5 is arranged for bottom inspection of the bottom area 2b of the preform 2.
- the optical axis B of the second camera 5 is aligned substantially perpendicular to the bottom portion 2b.
- the injection point 2d of the preform 2 can be detected in transmitted light and its position compared to the outer contour of the preform 2 can be evaluated. If, for example, the injection point 2d is not concentric with the silhouette, then it can be deduced that the preform 2 is deformed along its longitudinal axis. Furthermore, holes in the injection point 2d or inclusions or foreign bodies in the bottom region 2b can be detected.
- the lighting unit 6 can be seen, which has a plurality of LEDs 6a as light sources in a housing 6c.
- the light emitted by the LEDs 6a is homogenized via the diffuser 6b, so that the illumination unit 6 has a substantially uniformly emitting light exit surface 6d.
- a beam splitter 7 is provided between the first camera 4 and the mouth region 2 a, which diverts or couples the light emitted by the light exit surface 6 d in the direction of the optical axis C in the direction of the inspection axis I to the mouth region 2 a. Consequently, therefore, the illumination by means of the illumination unit 6 and the mouth inspection by means of the first camera 4 via the beam splitter 7 are parallel or even coaxial.
- the light reflected back from the mouth region 2a, in particular from the sealing surface 2c, passes via a transmission through the beam splitter 7 in the direction of the axis A to the camera 4 and can be detected there.
- the sealing surface 2c Due to the parallel or coaxial illumination and detection of the orifice area, light reflected on the sealing surface 2c directly reaches the camera and thus appears particularly bright in the image. By contrast, scratches scatter the light away from the inspection axis and thus appear as dark furrows, which can be recognized particularly well.
- the camera image is particularly rich in contrast due to the parallel or coaxial arrangement of the illumination and the camera.
- the uniformly radiating light exit surface 6d is formed larger than the maximum cross-sectional area Q of the preform 2. As a result, the light exit surface 6d from the perspective of the second camera 5 appears larger than the outer contour of the preform 2. The preform 2 can thereby be inspected particularly reliably in transmitted light.
- the trigger unit 8 can be seen, with which the LEDs 6a of the lighting unit 6 are controlled in such a way that light flashes are emitted therefrom.
- the light flashes are chosen to be so short in time that the preform 2 in the camera images of the first and second camera 4, 5 in spite of the transport movement of the transport device 3 appear to be stationary.
- the trigger unit 8 can also be integrated in the illumination unit 6 or be connected thereto by means of electrical connection lines.
- the first and the second camera 4, 5 are triggerable to the light flashes of the illumination unit 6, so that the recording of the camera images takes place at the same time as the delivery of the light flashes by the illumination unit 6.
- the cameras 4, 5 are connected to the trigger unit 8 via corresponding signal lines.
- the illumination of the illumination unit 6 via a transmission at the beam splitter 7 and the mouth inspection with the first camera 4 via a reflection at the beam splitter can be done.
- the positions of the first camera 4 and the illumination unit 6 can be interchanged with each other.
- the first camera 4 is housed in a housing, not shown here, which has on its inside a light-absorbing surface, for example a black color.
- a light-absorbing surface for example a black color.
- the inspection device 1 according to the embodiment in FIG. 1 is used as follows:
- the preform 2 is transported by means of the transport device 3 to the inspection position shown in FIG. 1, wherein upon reaching this position by the trigger device 8, a flash of light of the illumination unit 6 is triggered.
- the light is reflected starting from the light exit surface 6d via the beam splitter 7 and transilluminates the preform 2 from the mouth region 2a in the direction of the bottom region 2b.
- the image recording of the first and second camera 4 and 5 is triggered, wherein the preform 2 appears in the camera image of the first camera 4 in incident light and in the camera image of the second camera 5 in transmitted light.
- the images thus recorded by the first camera 4 and by the second camera 5 taken camera images are forwarded to an image processing unit, not shown here, with which they are then evaluated in terms of scratch or ovality of the sealing surface 2c and an asymmetry of the injection point 2d out. Also conceivable are other inspection methods for the preform 2.
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102015213352.4A DE102015213352B4 (de) | 2015-07-16 | 2015-07-16 | Inspektionsvorrichtung für einen Vorformling |
| PCT/EP2016/061864 WO2017008944A1 (de) | 2015-07-16 | 2016-05-25 | Inspektionsvorrichtung für einen vorformling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3322974A1 true EP3322974A1 (de) | 2018-05-23 |
Family
ID=56081485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP16725133.9A Withdrawn EP3322974A1 (de) | 2015-07-16 | 2016-05-25 | Inspektionsvorrichtung für einen vorformling |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3322974A1 (de) |
| CN (1) | CN107810408B (de) |
| DE (1) | DE102015213352B4 (de) |
| WO (1) | WO2017008944A1 (de) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6897929B2 (ja) * | 2017-02-20 | 2021-07-07 | 株式会社エヌテック | 透明物品の検査装置 |
| JP6744240B2 (ja) * | 2017-02-23 | 2020-08-19 | 倉敷紡績株式会社 | プリフォームの底部検査装置 |
| FR3117920B1 (fr) | 2020-12-22 | 2022-12-16 | Sidel Participations | Procédé de positionnement automatique de rampes dans une station de chauffage de préformes |
| CH719706A2 (de) * | 2022-05-19 | 2023-11-30 | Finatec Holding Ag | Verfahren und Vorrichtung zur optischen Prüfung von Formteilen. |
| KR20260052571A (ko) * | 2024-10-11 | 2026-04-20 | 주식회사 엘지에너지솔루션 | 전극 비전검사 장치 및 방법 |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4943713A (en) * | 1987-11-27 | 1990-07-24 | Hajime Industries Ltd. | Bottle bottom inspection apparatus |
| CH679698A5 (de) * | 1989-10-06 | 1992-03-31 | Elpatronic Ag | |
| DE10322459B3 (de) * | 2003-05-16 | 2004-11-11 | Krones Ag | Inspektionsvorrichtung für Flaschen |
| DE10310273A1 (de) * | 2003-03-10 | 2004-09-23 | Syscona Kontrollsysteme Gmbh | Vollinspektion der Innenwand transparenter Gebinde |
| DE60315138T3 (de) * | 2003-05-22 | 2011-07-07 | M.& G. Polymers U.S.A. Llc | Vorrichtung und Verfahren zur Qualitätsüberprüfung von Vorformlingen aus Kunststoff |
| JP2005017003A (ja) * | 2003-06-24 | 2005-01-20 | Sukiyan Technol:Kk | バイアルの検査システム |
| JP4403777B2 (ja) * | 2003-11-07 | 2010-01-27 | ウシオ電機株式会社 | 配線パターン検査装置及び方法 |
| DE102006034432A1 (de) * | 2006-07-26 | 2008-01-31 | Krones Ag | Inspektionsvorrichtung für Behältnisse |
| DE102006047150B4 (de) * | 2006-10-05 | 2013-01-17 | Krones Aktiengesellschaft | Inspektionsvorrichtung für Behältnisse |
| GB2482473A (en) | 2010-06-29 | 2012-02-08 | Constar Internat Uk Ltd | Inspection of articles |
| DE102010050673A1 (de) * | 2010-11-09 | 2012-05-10 | Krones Aktiengesellschaft | Vorrichtung und Verfahren zum Inspizieren von Behältnissen |
| US8896828B2 (en) * | 2011-03-29 | 2014-11-25 | Owens-Brockway Glass Container Inc. | Optical inspection of containers |
| JP5883779B2 (ja) * | 2012-05-29 | 2016-03-15 | 株式会社 日立産業制御ソリューションズ | 撮像装置および照明装置 |
| DE102012016342A1 (de) | 2012-08-20 | 2014-05-15 | Khs Gmbh | Behälterinneninspektion von unten durch den Boden hindurch |
| CN202794062U (zh) * | 2012-09-28 | 2013-03-13 | 肇庆中导光电设备有限公司 | 具有透射及反射光源的照明装置及光学检测系统 |
| DE102012022474B4 (de) * | 2012-11-19 | 2014-06-26 | Khs Corpoplast Gmbh | Inspektionsanordnung für Behältermündungen |
| CN203324204U (zh) * | 2013-07-18 | 2013-12-04 | 江苏科思机电工程有限公司 | 一种工件表面和边缘质量检测机 |
-
2015
- 2015-07-16 DE DE102015213352.4A patent/DE102015213352B4/de not_active Expired - Fee Related
-
2016
- 2016-05-25 CN CN201680037557.XA patent/CN107810408B/zh not_active Expired - Fee Related
- 2016-05-25 EP EP16725133.9A patent/EP3322974A1/de not_active Withdrawn
- 2016-05-25 WO PCT/EP2016/061864 patent/WO2017008944A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| CN107810408A (zh) | 2018-03-16 |
| CN107810408B (zh) | 2021-03-16 |
| DE102015213352A1 (de) | 2017-01-19 |
| WO2017008944A1 (de) | 2017-01-19 |
| DE102015213352B4 (de) | 2018-10-31 |
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