DE102011016160A1 - Device for calibrating outside diameter of extruded tube, has vacuum source that is connected with water chamber - Google Patents

Device for calibrating outside diameter of extruded tube, has vacuum source that is connected with water chamber Download PDF

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Publication number
DE102011016160A1
DE102011016160A1 DE102011016160A DE102011016160A DE102011016160A1 DE 102011016160 A1 DE102011016160 A1 DE 102011016160A1 DE 102011016160 A DE102011016160 A DE 102011016160A DE 102011016160 A DE102011016160 A DE 102011016160A DE 102011016160 A1 DE102011016160 A1 DE 102011016160A1
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Prior art keywords
water
water chamber
vacuum tank
inlet
extruded tube
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DE102011016160A
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German (de)
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Auf Nichtnennung Antrag
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Inoex GmbH
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Inoex GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/905—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article using wet calibration, i.e. in a quenching tank
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/901—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies
    • B29C48/903—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article of hollow bodies externally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
    • B29C48/908—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article characterised by calibrator surface, e.g. structure or holes for lubrication, cooling or venting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9115—Cooling of hollow articles
    • B29C48/912—Cooling of hollow articles of tubular films
    • B29C48/913—Cooling of hollow articles of tubular films externally

Abstract

The device has a vacuum tank calibration sleeve (2) that is arranged on outside of a vacuum tank (1). The calibration sleeve is provided with an inlet (4). The vacuum tank has a water chamber (8) through which water is supplied to form a water film. The water chamber is connected with a vacuum source. A ring housing (5) is provided onto a front wall (6) of the vacuum tank. An annular groove (9) and a water discharge opening (10) are supplied with water from the water chamber. An independent claim is included for method for operating device used for calibrating outside diameter of extruded tube.

Description

Die vorliegende Erfindung betrifft eine Vorrichtung zur Kalibrierung des Außendurchmessers eines extrudierten Rohres sowie ein Verfahren zum Betreiben einer derartigen Vorrichtung.The present invention relates to a device for calibrating the outer diameter of an extruded tube and a method for operating such a device.

Aus dem Stand der Technik sind Kalibrierhülsen bekannt, deren Innendurchmesser im laufenden Betrieb in engen Grenzen veränderbar ist. Diese Änderung des Innendurchmessers der Kalibrierhülse dient dazu, Kunststoffrohre unter Berücksichtigung der von verschiedenen Faktoren abhängenden Schrumpfung des Kunststoffes innerhalb der geforderten Toleranzgrenzen herzustellen. Eine derartige Kalibrierhülse geht z. B. aus der DE 44 08 064 C1 hervor. Die Kalibrierhülse dieser bekannten Vorrichtung hat die Form eines spiralig gewickelten Bandes mit großer Steigung, wobei zwischen den einzelnen Windungen ein Spalt angeordnet ist, durch den hindurch Unterdruck auf das durch die Kalibrierhülse gezogene Rohr einwirken sowie auch Kühlwasser zugeführt werden kann.Calibration sleeves are known from the prior art, the inner diameter of which can be changed within narrow limits during operation. This change in the inner diameter of the calibration sleeve serves to produce plastic pipes taking into account the shrinkage of the plastic depending on various factors within the required tolerance limits. Such a calibration sleeve is z. B. from the DE 44 08 064 C1 out. The calibration of this known device has the form of a spiral-wound band with a large pitch, wherein between the individual turns, a gap is arranged, through which negative pressure act on the drawn through the calibration tube and cooling water can be supplied.

Die Kalibrierhülse befindet sich in einem Vakuumtank, während ihr Einlauf außerhalb des Vakuumtankes angeordnet ist. Der Einlauf ist als Wasserring ausgebildet, der mit Wasseranschlüssen für eine Wasserzufuhr ausgerüstet ist, durch die Wasser auf das einlaufende Kunststoffrohr aufgebracht werden kann. Dadurch erhält die Rohroberfläche einen Gleit- und Dichtfilm, der gleichzeitig der Kühlung der Oberfläche dient. Allerdings ist dieser Gleit- und Dichtfilm unregelmäßig, da das über den Wasserring zugeführte Wasser nach außen abläuft und sich auf Grund der Schwerkraft im unteren Bereich der Rohroberfläche ansammelt.The calibration sleeve is located in a vacuum tank while its inlet is located outside the vacuum tank. The inlet is designed as a water ring, which is equipped with water connections for a water supply through which water can be applied to the incoming plastic pipe. As a result, the tube surface receives a sliding and sealing film, which also serves to cool the surface. However, this sliding and sealing film is irregular, since the water supplied via the water ring runs outward and accumulates due to gravity in the lower part of the pipe surface.

In der DE 10 2005 002 820 B3 ist eine stufenlos einstellbare Kalibrierhülse für extrudierten Kunststoffrohre beschrieben, deren Innendurchmesser im laufenden Betrieb auf Kunststoffrohre unterschiedlicher Außendurchmesser einstellbar ist. Diese Kalibrierhülse besteht aus zwei Bänderlagen, die sich nach Art eines Scherengitters kreuzen und an den Kreuzungspunkten gelenkig miteinander verbunden sind. Die Kalibrierhülse ist zum Kühlen und zum Anlegen eines Unterdrucks an das extrudierte Rohr in einem Vakuumtank angeordnet. Die Bänder der Kalibrierhülse sind mit einem Einlaufkopf verbunden, der sich außerhalb des Vakuumtanks befindet. Der Einlaufkopf besteht aus radial verstellbaren Segmenten die geschlitzt sind und sich in ihrem unteren Bereich überlappen. Diese Segmente liegen mit ihren Stirnseiten an dem extrudierten Rohr an und weisen Wasserkanäle auf, über die der Rohroberfläche Wasser zugeführt wird. Diese Kanäle stehen mit Wasser kammern in Verbindung, die mit Druckwasserversorgt werden. Dadurch ist eine intensive Kühlung des Einlaufs sowie die Ausbildung eines Schmier- und Dichtfilms zur Gleitkühlung des extrudierten Kunststoffrohres möglich. Allerdings ist die Ausbildung des Wasserfilms noch nicht optimal, da auch hier Wasser nach außen abläuft und sich zum Teil im unteren Bereich der Rohroberfläche sammelt.In the DE 10 2005 002 820 B3 is a continuously adjustable calibration sleeve for extruded plastic pipes described whose inner diameter is adjustable during operation on plastic pipes of different outer diameter. This calibration sleeve consists of two tape layers, which intersect in the manner of a scissor lattice and are hinged together at the crossing points. The calibration sleeve is arranged to cool and apply a vacuum to the extruded tube in a vacuum tank. The bands of the calibration sleeve are connected to an inlet head located outside the vacuum tank. The inlet head consists of radially adjustable segments which are slotted and overlap in their lower area. These segments bear with their end faces on the extruded tube and have water channels, through which the pipe surface water is supplied. These channels communicate with water chambers, which are supplied with pressurized water. As a result, intensive cooling of the inlet and the formation of a lubricating and sealing film for sliding cooling of the extruded plastic pipe is possible. However, the formation of the water film is not optimal, since here too water runs out and collects in part in the lower part of the pipe surface.

Aufgabe der vorliegenden Erfindung ist es daher, hier Abhilfe zu schaffen und eine Lösung zur Verfügung zu stellen, mit der ein optimaler Wasserfilm im Einlauf einer Kalibrierhülse realisiert werden kann.Object of the present invention is therefore to remedy this situation and to provide a solution with which an optimal water film can be realized in the inlet of a Kalibrierhülse.

Diese Aufgabe wird erfindungsgemäß mit einer Vorrichtung zur Kalibrierung des Außendurchmessers von extrudierten Rohren gelöst, die die Merkmale des Anspruchs 1 aufweist, bzw. durch ein Verfahren mit den Merkmalen des Anspruchs 2.This object is achieved with a device for calibrating the outer diameter of extruded tubes having the features of claim 1, or by a method having the features of claim 2.

Erfindungsgemäß ist also die mindestens eine Wasserkammer des Einlaufs mit einer Unterdruckquelle verbunden. Der Unterdruck in der Wasserkammer kann so eingestellt werden, dass zum Einen verhindert wird, dass Wasser aus dem Einlauf nach außen abläuft und zum Anderen, dass sich Wasser im unteren Bereich der Rohroberfläche ansammelt. Im Ergebnis bildet sich zwischen dem Einlauf und dem extrudierten Rohr ein konstanter Wasserfilm aus, der für eine optimale Schmierung und Kühlung der Rohroberfläche sowie für eine optimale Abdichtung z um Vakuumtank sorgt. Aufgrund der optimalen Kühlung im Einlauf werden auch Klebeeffekte des Schmelzeschlauchs an der Kalibrierhülse vermieden, was sich positiv auf die Qualität des extrudierten Rohres auswirkt.According to the invention, therefore, the at least one water chamber of the inlet is connected to a vacuum source. The negative pressure in the water chamber can be adjusted so that on the one hand prevents water from flowing out of the inlet to the outside and on the other hand that water accumulates in the lower part of the pipe surface. As a result, a constant water film is formed between the inlet and the extruded tube, which ensures optimum lubrication and cooling of the tube surface as well as optimal sealing z around the vacuum tank. Due to the optimal cooling in the inlet, adhesive effects of the melt tube on the calibration sleeve are avoided, which has a positive effect on the quality of the extruded tube.

Eine vorteilhafte Ausgestaltung der Erfindung ergibt sich aus dem Unteranspruch.An advantageous embodiment of the invention results from the dependent claim.

Die Erfindung wird nachstehend anhand eines Ausführungsbeispiels näher erläutert. Die einzige zu diesem Ausführungsbeispiel gehörende 1 zeigt einen Schnitt durch den Einlaufbereich eines Vakuumtanks 1. In dem Vakuumtank 1 ist eine starre Kalibrierhülse 2 angeordnet, deren Wandung auf den Umfang und die Länge verteilte Schlitze 3 aufweist. Durch diese Schlitze 3 wirkt der im Vakuumtank 1 herrschende Unterdruck sowie Kühlwasser auf ein durch die Kalibrierhülse 2 gezogenes Rohr ein. Das Rohr wird dadurch an die Innenwandung der Kalibrierhülse 2 angesaugt und somit auf den gewünschten Außendurchmesser kalibriert. Gleichzeitig erfolgt eine intensive Kühlung des extrudierten Rohres, die in dem Vakuumtank 1 in der Extrusionslinie nachfolgenden Kühltanks fortgesetzt wird.The invention will be explained in more detail below with reference to an embodiment. The only belonging to this embodiment 1 shows a section through the inlet region of a vacuum tank 1 , In the vacuum tank 1 is a rigid calibration sleeve 2 arranged, whose wall on the circumference and the length of distributed slots 3 having. Through these slots 3 acts in the vacuum tank 1 prevailing negative pressure as well as cooling water on a through the calibration sleeve 2 pulled in a pipe. The tube is thereby against the inner wall of the Kalibrierhülse 2 sucked and thus calibrated to the desired outside diameter. At the same time there is an intensive cooling of the extruded tube in the vacuum tank 1 in the extrusion line subsequent cooling tanks is continued.

Die Kalibrierhülse 2 besitzt einen Einlauf 4, der außerhalb des Vakuumtanks 1 angeordnet ist. Dieser Einlauf 4 besteht aus einem Fortsatz 2.1 der Kalibrierhülse 2, der auf seinem Umfang von einem Ringgehäuse 5 umgeben ist. Das Ringgehäuse 5 ist an eine Stirnwand 6 des Vakuumtanks 1 angeschraubt.The calibration sleeve 2 owns an enema 4 that's outside the vacuum tank 1 is arranged. This enema 4 consists of an extension 2.1 the calibration sleeve 2 on its perimeter of a ring housing 5 is surrounded. The ring housing 5 is on a front wall 6 of the vacuum tank 1 screwed.

Des Ringgehäuse 5 besitzt einen Wasserzulauf 7, der eine Wasserkammer 8 speist, die den Fortsatz 2.1 der Kalibrierhülse 2 ringförmig umgibt. Der Fortsatz 2.1 weist vier voneinander beabstandete Ringnuten 9 auf, die auf ihrem Umfang verteilte Wasserauslässe 10 besitzen, welche sich in den Innenraum des Fortsatzes 2.1 öffnen. Die Ringnuten 9 bzw. deren Wasserauslässe 10 werden über die Wasserkammer 8 mit Wasser versorgt.The ring housing 5 has a water inlet 7 , the one water chamber 8th feeds the extension 2.1 the calibration sleeve 2 surrounds annularly. The extension 2.1 has four spaced annular grooves 9 on, the water outlets distributed on their circumference 10 own, which are in the interior of the extension 2.1 to open. The ring grooves 9 or their water outlets 10 be over the water chamber 8th supplied with water.

Die Wasserkammer 8 ist mit einer Unterdruckquelle verbunden, was in der Zeichnung nicht dargestellt ist. Der in der Wasserkammer 8 einstellbare Unterdruck ist dabei wesentlich geringer als der im Vakuumtank 8, was durch die beiden eingezeichneten Manometer 11 symbolisch dargestellt werden soll.The water chamber 8th is connected to a vacuum source, which is not shown in the drawing. The one in the water chamber 8th adjustable negative pressure is much lower than that in the vacuum tank 8th , which is indicated by the two drawn pressure gauges 11 symbolically represented.

Nach dem Austritt aus einem nicht dargestellten Extrusionswerkzeug läuft das heiße, noch verformbare Rohr, auch als Schmelzeschlauch bezeichnet, in den Einlauf 4 der Kalibrierhülse 2 ein. Um diesen Eintritt in die Kalibrierhülse 2 zu erleichtern, weist das Ringgehäuse 5 eine Einlaufschräge 12 auf. Im Bereich der Ringnuten 9 des Einlaufs 4 bildet sich ein Wasserfilm zwischen der Innenwandung des Fortsatzes 2.1 der Kalibrierhülse 2 und der Rohroberfläche aus, der der Kühlung und Schmierung der Rohroberfläche dient und gleichzeitig eine Abdichtung zum Vakuumtank 1 bewirkt. Der Unterdruck in der Wasserkammer 8 wird bei konstanter Wasserzufuhr über den Wasserzulauf 7 so eingestellt, dass kein Wasser nach außen abläuft.After exiting from an extrusion tool, not shown, the hot, still deformable tube, also referred to as a molten tube runs in the inlet 4 the calibration sleeve 2 one. To this entry into the calibration sleeve 2 To facilitate, has the ring housing 5 an inlet slope 12 on. In the area of the ring grooves 9 of the enema 4 A film of water forms between the inner wall of the extension 2.1 the calibration sleeve 2 and the Rohroberfläche, which serves the cooling and lubrication of the tube surface and at the same time a seal to the vacuum tank 1 causes. The negative pressure in the water chamber 8th is at constant water supply via the water inlet 7 adjusted so that no water runs out.

ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION

Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Zitierte PatentliteraturCited patent literature

  • DE 4408064 C1 [0002] DE 4408064 C1 [0002]
  • DE 102005002820 B3 [0004] DE 102005002820 B3 [0004]

Claims (3)

Vorrichtung zur Kalibrierung des Außendurchmessers eines extrudierten Rohres mit einer in einem Vakuumtank angeordneten Kalbrierhülse, die einen außerhalb des Vakuumtanks angeordneten Einlauf mit mindestens einer Wasserkammer aufweist, über die der Rohroberfläche Wasser zur Bildung eines Wasserfilms zugeführt wird, dadurch gekennzeichnet, dass die Wasserkammer (8) mit einer Unterdruckquelle in Verbindung steht.Device for calibrating the outside diameter of an extruded tube with a calendering sleeve disposed in a vacuum tank and having an inlet arranged outside the vacuum tank with at least one water chamber via which water is supplied to the tube surface to form a water film, characterized in that the water chamber ( 8th ) is in communication with a vacuum source. Verfahren zum Betrieben der Vorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass der Unterdruck in der Wasserkammer (8) so eingestellt wird, dass sich ein definierter Wasserfilm zwischen Rohroberfläche und Einlauf (4) bildet.Method for operating the device according to claim 1, characterized in that the negative pressure in the water chamber ( 8th ) is adjusted so that a defined water film between pipe surface and inlet ( 4 ). Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass der Wasserfilm bei konstanter Wasserzufuhr über den Unterdruck in der Wasserkammer (8) gesteuert wird.A method according to claim 2, characterized in that the water film at constant water supply via the negative pressure in the water chamber ( 8th ) is controlled.
DE102011016160A 2011-04-05 2011-04-05 Device for calibrating outside diameter of extruded tube, has vacuum source that is connected with water chamber Ceased DE102011016160A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107498825A (en) * 2017-08-23 2017-12-22 河南尚品优塑科技有限公司 A kind of sizing nested structure in bosh

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4221920A1 (en) * 1992-02-27 1993-09-09 Theysohn Friedrich Fa WALL THICKNESS MEASURING DEVICE WITH CALIBRATION DEVICE
DE4408064C1 (en) 1994-03-05 1995-09-07 Lueers Heinrich Device for calibrating the outside diameter of a continuously extruded pipe
DE19843339A1 (en) * 1998-09-22 2000-03-30 Strumann Werner Egeplast Device for the production of plastic pipes
EP1291152A1 (en) * 2001-04-30 2003-03-12 CONPRO GmbH Calibrating sleeve with intensive cooling
DE20219089U1 (en) * 2002-02-13 2003-03-27 Strumann Werner Egeplast Suction chamber, for plastic pipe production die head, has wall openings to allow coolant flow onto outer face of extruded pipe
DE102005002820B3 (en) 2005-01-20 2006-05-11 Inoex Gmbh Stepless adjustable calibration sleeve for extruded plastic pipe comprises overlapping toothed radial segments and variable braid and segment ends contact pipe and connect to segments with flush joints

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4221920A1 (en) * 1992-02-27 1993-09-09 Theysohn Friedrich Fa WALL THICKNESS MEASURING DEVICE WITH CALIBRATION DEVICE
DE4408064C1 (en) 1994-03-05 1995-09-07 Lueers Heinrich Device for calibrating the outside diameter of a continuously extruded pipe
DE19843339A1 (en) * 1998-09-22 2000-03-30 Strumann Werner Egeplast Device for the production of plastic pipes
EP1291152A1 (en) * 2001-04-30 2003-03-12 CONPRO GmbH Calibrating sleeve with intensive cooling
DE20219089U1 (en) * 2002-02-13 2003-03-27 Strumann Werner Egeplast Suction chamber, for plastic pipe production die head, has wall openings to allow coolant flow onto outer face of extruded pipe
DE102005002820B3 (en) 2005-01-20 2006-05-11 Inoex Gmbh Stepless adjustable calibration sleeve for extruded plastic pipe comprises overlapping toothed radial segments and variable braid and segment ends contact pipe and connect to segments with flush joints

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107498825A (en) * 2017-08-23 2017-12-22 河南尚品优塑科技有限公司 A kind of sizing nested structure in bosh

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Effective date: 20130112