WO2017017614A1 - Système pour la détection de fuites de produits liquides ou fluides contenus dans des récipients introduits dans des boîtes en carton transportées le long d'une ligne d'emballage - Google Patents

Système pour la détection de fuites de produits liquides ou fluides contenus dans des récipients introduits dans des boîtes en carton transportées le long d'une ligne d'emballage Download PDF

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Publication number
WO2017017614A1
WO2017017614A1 PCT/IB2016/054464 IB2016054464W WO2017017614A1 WO 2017017614 A1 WO2017017614 A1 WO 2017017614A1 IB 2016054464 W IB2016054464 W IB 2016054464W WO 2017017614 A1 WO2017017614 A1 WO 2017017614A1
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WO
WIPO (PCT)
Prior art keywords
control unit
conductors
roller
box
leakage
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.)
Ceased
Application number
PCT/IB2016/054464
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English (en)
Inventor
Leandro SGARGI
Stefano FUSTINI
Angelo FINI
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of WO2017017614A1 publication Critical patent/WO2017017614A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
    • G01M3/165—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means by means of cables or similar elongated devices, e.g. tapes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/34—Sorting according to other particular properties
    • B07C5/3404—Sorting according to other particular properties according to properties of containers or receptacles, e.g. rigidity, leaks, fill-level
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B57/00—Automatic control, checking, warning, or safety devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B57/00—Automatic control, checking, warning, or safety devices
    • B65B57/10—Automatic control, checking, warning, or safety devices responsive to absence, presence, abnormal feed, or misplacement of articles or materials to be packaged
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B57/00—Automatic control, checking, warning, or safety devices
    • B65B57/18—Automatic control, checking, warning, or safety devices causing operation of audible or visible alarm signals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
    • B65B61/28—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for discharging completed packages from machines
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
    • G01M3/18—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
    • G01M3/186—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B2220/00—Specific aspects of the packaging operation
    • B65B2220/16—Packaging contents into primary and secondary packaging

Definitions

  • the present invention relates to the packaging field, in particular to packaging of fluid or liquid products with sufficient electrical conductivity into cardboard boxes.
  • the present invention relates to a device for detecting leakages, which come out of flasks or bottles containing the fluid or liquid products and affect the bottom of the cardboard boxes, thus damaging it.
  • beverages in bottles but also milk and its by-products, dressings and sauces, detergents, lubricators and many other liquid or fluid products with sufficient electrical conductivity, are often sold in containers made of glass, cardboard or plastic, packaged in groups in cardboard boxes.
  • Packaging of products and the subsequent containers into the cardboard boxes is generally carried out by automated processes and systems, in which the cardboard boxes are moved along roller conveyors to be eventually put onto pallets, that is, picked up one by one from the packaging line, manually or by robotized devices, and stacked orderly on a platform, usually of wood, called pallet, intended for being taken over and conveyed by mechanical means.
  • a first level includes only aesthetic damages, in case of leakages of small amounts of liquid, which cause only stains on the bottom seen from outside, or the deformation of the bottom.
  • the publication US39381 16A describes a device for detecting leakages of containers included in cardboard boxes. Basically, it comprises a sensor plate, which is mounted so as to be an integral part of the normal conveying line of the boxes. Two bars of copper, parallel and spaced out, are embedded in the plate and extend in a direction crosswise to the movement path of the boxes along the conveying line.
  • a suitable control and amplification circuit activates a visual and/or acoustic indicator and stops the machine and palletizer until the damaged box is removed.
  • the passage itself on the bars of copper, with the relative corners oriented crosswise with respect to the forward movement of the boxes, can be sufficient to tear the bottom of the box, leaving fragments, which can put at risk the correct operation of the device.
  • the sensitivity of the device is penalized by the relative motion between the box and the detecting bars, therefore the period of time, during which the soak area of the bottom of the box remains between the two bars, thus establishing a connection therebetween, is extremely short and is affected in a determining way by the speed of the forward movement of the boxes.
  • the document JP 2008128828 describes a device, which functions as a detector of small leakages that can occur along the welding area of pouches of synthetic plastic material filled with liquid products.
  • the pouches are conveyed along a belt conveying line, along which the sliding surface is interrupted.
  • a pair of rollers is provided at the interruption point.
  • a sensor cable is wound on the surface of the rollers. The pressure between the rollers causes a leakage of a small amount of liquid, if the welding is faulty or if there is a small hole in the welding area.
  • the sensor cable detects the presence of the liquid and the device emits a warning signal.
  • the device of the publication JP 2008128828 is not suitable for detecting the leakages of containers carried in the cardboard boxes either, because the interruption of the sliding surface creates a stepped area on the path of the products and the bottom of a wet cardboard box could tear in this area. Obviously, it does not happen with pouches of plastic material, which are stronger and not subjected to tearing.
  • this device checks the leakage of the container of the product and not of the box, inside which the containers are held.
  • the proposed device for detecting leakages of liquid or fluid products, with sufficient electrical conductivity, introduced in containers packaged into cardboard boxes.
  • the proposed device is simple and cheap and can be easily integrated with any kind of packaging system and does not damage in any way the bottom of the boxes possibly weakened by a leakage of liquid or fluid from the containers held thereinside. In this way, the box can be removed without further damages thereof with the containers and dirt leaving the conveying line.
  • Another object of the invention is to propose a device which is extremely sensitive to the detection of the soak areas of the bottom of the boxes, whose sensitivity is not affected, or is affected in a minimum way, by the speed of forward movement of the boxes on the conveyor.
  • a sensing roller adapted to be installed along or in proximity to a packaging line of liquid or fluid products included in corresponding containers introduced into cardboard boxes, detects the presence of leakages of said liquid or fluid products, in particular on the bottom of said cardboard boxes, and comprises a cylindrical body, on which two conductors or probes are applied, wound in a spiral and parallel to each other and extending from one end to the other of said cylindrical body, with two ends of the conductors being connected to a control unit by means of rings and respective sliding contacts.
  • the control unit acts on the packaging line, so as to remove or allow to remove the cardboard box, on the bottom of which the presence of leakages has been detected.
  • the terminal part of the packaging line distinguishes the invention with respect to the prior art, since the boxes are placed on a pallet in automatic way.
  • the wholeness of the bottom of the box including the containers, and not of the containers, is particularly important. For this reason, the roller passes through the whole lower surface of the bottom of the box, touching it point by point, and not only the closure part, as it occurs in the device of the publication JP 2008128828.
  • FIG 1 and Figure 2 illustrate the sensing roller proposed by the present invention in two different embodiments, respectively;
  • FIG. 3 illustrates a detail of the sensing roller, seen from below
  • Figure 4 illustrates a simplified form of the terminal part of a packaging system of containers into cardboard boxes provided with a palletizer
  • Figure 5 is a simplified block diagram of the device proposed by the invention, operatively associated with the system of Figure 4.
  • the numeral 1 indicates a sensing roller made in accordance with the invention in a first embodiment ( Figure 1 ), adapted to be installed along or in proximity to a packaging line 40 of liquid or fluid products introduced into containers inside corresponding cardboard boxes 15.
  • the sensing roller 1 comprises a cylindrical body 2, preferably tubular, having its ends provided with supports 3 adapted to be rotatably constrained in a known way, along the conveying path of a roller conveyor 31 , for example before the palletizer device 30, as illustrated in Figure 4.
  • the sensing roller 1 could also be installed, always in such a way as to rotate freely, before the roller conveyor 31 or after it. The latter case can be applied only if there is no palletizer device 30, which automatically withdraws the boxes 15 from the roller conveyor 31 , since the boxes are moved manually, as it will become more evident below.
  • the cylindrical body 2 of the roller 1 has, wound in a spiral thereon, two conductors or probes 4, 5, which extend wrapping the cylindrical body 2 from one of its ends to the other, parallel to each other.
  • the conductors 4, 5 can be produced in stainless steel.
  • the conductivity of this material is sufficient for an optimal operation of the system and the wear caused by the passage of the boxes is considerably reduced.
  • the conductors of stainless steel are more resistant to corrosion, even caused by leakages of the packaged products.
  • the two conductors 4, 5 are connected with one end to respective rings 6, 7, made of conductive material, fixed to one head 8 of the cylindrical body 2 of the roller 1 .
  • the two rings 6, 7 of conductive material, for example copper, are situated in proximity to a head 8 of the cylindrical body 2.
  • Two corresponding sliding contacts 9, 10 press the rings.
  • the sliding contacts can be made of brushes of conductive material, such as coal, or of metallic mesh, of the type used for electrical engines.
  • the sliding contacts 9, 19 are connected to a control unit 20, and being joined to the mentioned ends of the conductors 4, 5, they create their connection with the control unit 20, without obstructing the rotation of the roller 1 .
  • the remaining two ends of said conductors 4, 5 are isolated from each other ( Figure 1 ).
  • the control unit 20 is constructed so as to act on the bottom of a box 15, when a leakage 16 is detected, so as to remove or allow to remove the cardboard box 15, in which the presence of leakages 16 has been detected.
  • the leakage or leakages 16 are detected, when they are in such a position as to create a connection between the two conductors 4, 5 ( Figure 3), connection which is detected by the control unit 20, since it closes the circuit formed by the conductors 4 and 5.
  • the sensing roller 101 ( Figure 2) comprises the cylindrical body
  • the ends of the only conductor 104 are connected to two rings 106, 107 of conductive material located each in proximity to a corresponding head of the cylindrical body 102.
  • two corresponding sliding contacts 109, 1 10 press the two rings 106, 107, constituted by carbon brushes or metallic mesh, connected in turn to the control unit 20.
  • the control unit 20 is connected with ejecting means 33 of the cited box 15 affected by the leakage 16, for example, formed by a pusher, to which corresponds, in an exemplary and simplified form, an inclined plane 37, on which the box 16, removed from the roller conveyor 31 , is made to slide.
  • the control unit 20 is also connected to stop means 34, adapted to stop operation of the packaging system 40, as well as the optical warning means 35 and acoustic warning means 36.
  • control unit 20 is connected to the control panel of the system 40, leading to ejecting means 33, the stop means 34, optical warning means 35 and acoustic warning means 36, which are operated one by one or in combination depending on the detection of a leakage 16 by the sensing roller 1 , 101.
  • the boxes 15, already filled with containers (not shown) including the liquid or fluid product, are made move forward along the roller conveyor 31 which leads to the palletizer 30.
  • the forward movement of the boxes is determined by pushing means, not shown herein as known and not relevant to the invention, or due to inertia as a result of the push received in a previous section or pushed each by a subsequent one.
  • the arm 38 of the palletizer 30 picks up the boxes 15 one by one and puts them orderly on a pallet 39.
  • the roller 1 or 101 is installed in an intermediate position of the roller conveyor 31 , as illustrated, but it could be installed upstream of the roller conveyor. It could be situated also downstream of the roller conveyor 31 , if the palletizer did not pick up automatically the boxes, but if there were for example a receiving plane, from which the boxes would be moved manually.
  • the boxes 15 determine the rotation thereof, therefore without any scraping on the bottom of the box, which remains intact in any case. In this way, in any case, the roller passes through the whole lower surface of the bottom of the box 15, touching it point by point.
  • Figure 3 shows, in a simplified way, the roller in longitudinal section, ideally transparent and in contact with the bottom of the box 15, all this seen from below.
  • roller 101 provided with only one conductor, in this case the connection is created between two or more adjacent coils.
  • the variation of resistance at the ends of the conductor 104 is detected by the control unit 20 by measuring the resistance, and the presence of the leakage on the bottom of the box is determined.
  • the so generated signal is amplified and processed, and then conveyed to the control panel 32 of the packaging line 40.
  • the control panel determines only the ejection of the box, activating the pusher 33. In more serious cases, in which moving the box could make its bottom collapse and make the containers go out, a stop device 34 of the packaging line is activated.
  • the removal of the box or stopping the system can be associated with warning signals, obtained by an optical warning device 35, for example a flashing light, and/or an acoustic warning device 36, for example a beeper, buzzer, bell, horn or the like.
  • an optical warning device 35 for example a flashing light
  • an acoustic warning device 36 for example a beeper, buzzer, bell, horn or the like.
  • the system provided with the roller 1 or 101 is able to detect even the smallest leakages of liquid or fluid products with sufficient electrical conductivity, since the conductors 4 and
  • the leakage is promptly detected and in the most serious cases, stopping of the packaging line prevents disastrous effects caused by falling of the containers from the torn bottom of the box. If the containers are made of glass, they can break spreading the liquid product on the packaging line, with the risk of failures of the apparatuses and in any case making necessary the cleaning operations which determine long downtimes of the system.
  • the roller is simple and rapid to be manufactured, consequently it has limited costs and can be installed also on the already functioning systems, by substituting, for example, an idle roller or being applied upstream of a piece of the packaging line.
  • the conductors are made of stainless steel, therefore they are more resistant to the wear and attacks of corrosive agents, which can be present also among the packaged products. This is a considerable advantage with respect to the conductors of copper, which wear out after a short time and are easily attacked by the corrosive substances.
  • the control unit 20 or a part of it could be installed inside the tubular roller, thus eliminating the necessity for the sliding contacts and providing a connection with the remaining part of the control unit or with the control panel of the system in a wireless way, for example Bluetooth or WiFi.
  • the energy could be supplied by batteries situated inside the roller, for example rechargeable, possibly connected to a series of windings arranged radial at a head of the roller, with a plurality of fixed magnetic elements opposite thereto.
  • Rotation of the roller produces a voltage at the ends of the windings, and the resulting current, suitably rectified, filtered and stabilized, can be used for charging the batteries, making the roller wholly autonomous and extremely simple to install.
  • the boxes are conveyed on rollers and not on sliding surfaces, thus preventing scraping and possible tears. There are no teeth or steps along the boxes path.
  • the terminal part of the packaging line distinguishes the invention with respect to the prior art, since the boxes are placed on a pallet in automatic way.
  • the wholeness of the bottom of the box including the containers, and not of the containers, is particularly important. For this reason, the roller passes through the whole lower surface of the bottom of the box, touching it point by point, and not only the closure part, as it occurs in the device of the publication JP 2008128828.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

L'invention concerne un système de détection de fuites de produits liquides contenus dans des récipients introduits dans des boîtes en carton, comprenant un rouleau de détection (1) installé le long d'une ligne d'emballage (40) de produits liquides ou fluides dans des récipients correspondants introduits dans des boîtes en carton (15), pour détecter la présence d'une fuite (16) depuis les produits au niveau du fond des boîtes (15), lorsque la fuite (16) se trouve à une position de manière à établir une connexion entre deux conducteurs (4, 5) enroulés de manière hélicoïdale le long du corps cylindrique (2) du rouleau. Les conducteurs sont raccordés à une unité de commande (20). La connexion entre les conducteurs (4, 5) et l'unité de commande est obtenue par le biais de deux bagues (6, 7) constituées d'un matériau conducteur, auxquelles sont raccordées les extrémités des conducteurs (4, 5) et sur lesquelles coulissent deux contacts coulissants correspondants (9, 10), les bagues étant raccordées à l'unité de commande (20). L'unité de commande (20) est reliée à des moyens d'éjection (33) agissant sur ladite boîte (15) qui présente la fuite (16), et/ou à des moyens d'arrêt (34) dudit système d'emballage (40), et/ou à des moyens d'avertissement optique (35), et/ou à des moyens d'avertissement sonores (36).
PCT/IB2016/054464 2015-07-27 2016-07-26 Système pour la détection de fuites de produits liquides ou fluides contenus dans des récipients introduits dans des boîtes en carton transportées le long d'une ligne d'emballage Ceased WO2017017614A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102015000038639 2015-07-27
ITUB2015A002509A ITUB20152509A1 (it) 2015-07-28 2015-07-28 Rullo sensore per il rilevamento di perdite di prodotti liquidi o fluidi lungo linee di confezionamento degli stessi

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WO2017017614A1 true WO2017017614A1 (fr) 2017-02-02

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PCT/IB2016/054464 Ceased WO2017017614A1 (fr) 2015-07-27 2016-07-26 Système pour la détection de fuites de produits liquides ou fluides contenus dans des récipients introduits dans des boîtes en carton transportées le long d'une ligne d'emballage

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IT (1) ITUB20152509A1 (fr)
WO (1) WO2017017614A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108723087A (zh) * 2018-05-07 2018-11-02 哈尔滨工业大学 一种多层金属复合板脉冲电流辅助轧制方法及装置
CN112693691A (zh) * 2020-12-14 2021-04-23 湖州清优包装材料有限公司 一种自动化物流用的包装盒底部检测装置
CN112810916A (zh) * 2020-12-31 2021-05-18 佛山市正扬机械科技有限公司 一种用于充气食品生产的智能制造设备
WO2022063763A1 (fr) * 2020-09-22 2022-03-31 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V. Appareil de détection de fuites et procédé de fabrication de l'appareil
CN115200649A (zh) * 2022-09-15 2022-10-18 四川墨比品牌优创科技有限公司 食品输送稳定性控制装置、系统、方法及存储介质
CN119489982A (zh) * 2024-11-13 2025-02-21 武汉零点绿色食品股份有限公司 一种预制菜塑封包装缺陷智能检测方法及系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3938116A (en) * 1974-04-22 1976-02-10 The Molson Companies Limited Leak detection device
US4112417A (en) * 1975-09-18 1978-09-05 Doryokuro Kakunenryo Kaihatsu Jigyodan Apparatus for detecting leakage of liquid sodium
US4517827A (en) * 1983-03-24 1985-05-21 General Foods Incorporated Apparatus and method for testing for leakages in hermetically-sealed packages
JP2008128828A (ja) * 2006-11-21 2008-06-05 Lion Corp 液漏れ検出装置、液漏れ検出方法及び内容物が充填された包装袋の製造方法、包装袋

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3938116A (en) * 1974-04-22 1976-02-10 The Molson Companies Limited Leak detection device
US4112417A (en) * 1975-09-18 1978-09-05 Doryokuro Kakunenryo Kaihatsu Jigyodan Apparatus for detecting leakage of liquid sodium
US4517827A (en) * 1983-03-24 1985-05-21 General Foods Incorporated Apparatus and method for testing for leakages in hermetically-sealed packages
JP2008128828A (ja) * 2006-11-21 2008-06-05 Lion Corp 液漏れ検出装置、液漏れ検出方法及び内容物が充填された包装袋の製造方法、包装袋

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108723087A (zh) * 2018-05-07 2018-11-02 哈尔滨工业大学 一种多层金属复合板脉冲电流辅助轧制方法及装置
WO2022063763A1 (fr) * 2020-09-22 2022-03-31 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V. Appareil de détection de fuites et procédé de fabrication de l'appareil
CN112693691A (zh) * 2020-12-14 2021-04-23 湖州清优包装材料有限公司 一种自动化物流用的包装盒底部检测装置
CN112810916A (zh) * 2020-12-31 2021-05-18 佛山市正扬机械科技有限公司 一种用于充气食品生产的智能制造设备
CN115200649A (zh) * 2022-09-15 2022-10-18 四川墨比品牌优创科技有限公司 食品输送稳定性控制装置、系统、方法及存储介质
CN115200649B (zh) * 2022-09-15 2022-12-20 四川墨比品牌优创科技有限公司 食品输送稳定性控制装置、系统、方法及存储介质
CN119489982A (zh) * 2024-11-13 2025-02-21 武汉零点绿色食品股份有限公司 一种预制菜塑封包装缺陷智能检测方法及系统

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