DE202004004815U1 - Jig for trimming blade of screen printing scraper has the blade clamped and cut by an oscillating blade fitted to a slider - Google Patents

Jig for trimming blade of screen printing scraper has the blade clamped and cut by an oscillating blade fitted to a slider Download PDF

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Publication number
DE202004004815U1
DE202004004815U1 DE200420004815 DE202004004815U DE202004004815U1 DE 202004004815 U1 DE202004004815 U1 DE 202004004815U1 DE 200420004815 DE200420004815 DE 200420004815 DE 202004004815 U DE202004004815 U DE 202004004815U DE 202004004815 U1 DE202004004815 U1 DE 202004004815U1
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Germany
Prior art keywords
blade
cutting
cutting device
knife
slider
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Expired - Lifetime
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DE200420004815
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German (de)
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Priority to DE200420004815 priority Critical patent/DE202004004815U1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/04—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member
    • B26D1/06—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member wherein the cutting member reciprocates
    • B26D1/10—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member wherein the cutting member reciprocates in, or substantially in, a direction parallel to the cutting edge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/04—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a linearly-movable cutting member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/12—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
    • B26D1/25—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member
    • B26D1/26—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis substantially perpendicular to the line of cut
    • B26D1/30—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis substantially perpendicular to the line of cut with limited pivotal movement to effect cut
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
    • B26D3/28—Splitting layers from work; Mutually separating layers by cutting

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Cutting Processes (AREA)

Abstract

A jig for trimming the elastic blade of a scraper for screen printing has a razor type cutting blade held between two tapering clamping grips and fitted to a slider (3) which is moved along a guide track by a servo ram (5). The blade is on a pivot mount about a vertical axis and is oscillated at main frequency by an integral drive system in the slider, powered by a solenoid. The scraper blade (9) is held between two clamping strips (7, 8) with part of the blade exposed by an amount to be trimmed off. The oscillating drive provides a clean cut without edge distortion of the blade. The process can be repeated until the blade is cut to a minimum size.

Description

Die Erfindung bezieht sich auf eine Schneidevorrichtung nach der Gattung des Hauptanspruches. Eine derartige Schneidevorrichtung ist bekannt.The invention relates to a Cutting device according to the preamble of the main claim. Such one Cutting device is known.

Solche bekannten Schneidevorrichtungen werden auf dem Gebiet des Siebdrucks verwendet. Siebdruckmaschinen haben einen Wischbalken, eine sogenannte „Rakel", mit der Farbe über ein Sieb der Druckmaschine gleichmäßig verteilt wird. Die Rakel besteht aus einem Rakel-Klemmprofil und einem Rakelstrangprofil aus schneidbarem Kunststoff bzw. Gummi, das eine Wischlippe aufweist, die über das Sieb zur Farbverteilung hinweggezogen wird. Eine solche Wischlippe ist einem starken Verschleiß unterworfen und ist bald abgenützt und unwirksam.Such known cutting devices are used in the field of screen printing. Have screen printing machines a wiper bar, a so-called "squeegee", with the ink over a screen of the printing press equally distributed becomes. The doctor blade consists of a doctor blade clamping profile and a doctor blade extrusion profile made of cutable plastic or rubber, which has a wiper lip, the above the sieve is pulled away for color distribution. Such a wiper lip is subject to heavy wear and will soon wear out and ineffective.

Es ist deshalb bekannt und allgemein üblich, solche Wischlippen am Strangprofil dadurch zu regenerieren, dass das Strangprofil hochkant der Länge nach so abgeschnitten bzw. nachgeschliffen wird, dass eine neue Wischlippe bzw. Wischkante entsteht. Dieser Regenerierungsvorgang ist so lange wiederholbar, bis das Strangprofil zu niedrig geworden ist, um am Rakel-Klemmprofil noch festgespannt werden zu können.It is therefore known and common practice for such Wipe lips on the extruded profile to regenerate that the extruded profile upright lengthways is cut or reground so that a new wiper lip or wiping edge arises. This regeneration process can be repeated as long as until the extruded profile has become too low, on the squeegee clamping profile can still be tightened.

Üblicherweise wird zu einer entsprechenden Regenerierung eine kreisrunde Schneidscheibe verwendet, die von einem Motor in eine Drehbewegung versetzt wird, dessen Achse zum Strangprofil seitlich versetzt angeordnet ist. Die Scheibe ist so angeordnet, dass sie das Rakelprofil, das hochkant gespannt ist, der Länge nach nachschneidet. Beim Schneiden tritt die Schneidscheibe auf einer Seite in das Strangprofil ein. Dadurch wird die eine Kante der neu entstandenen Wischlippe in das Strangprofil hineingezogen. Auf der anderen Seite tritt dann die Schneidscheibe wieder aus dem Strangprofil heraus, wobei dort die neue Wischlippe aus dem Material des Strangprofils herausgezogen wird. Es ist klar, dass durch ein solches Schneideverfahren am Rakelprofil zwei unterschiedliche Wischlippen entstehen. Außerdem weist das mit einer Schneidscheibe erzeugte Schnittbild bogenförmige Schnittspuren auf.Usually a circular cutting disc is used for a corresponding regeneration used, which is set in rotation by a motor, whose axis is laterally offset from the extruded profile. The disc is arranged so that it has the doctor profile upright is strained, the length after recuts. The cutting disc occurs when cutting one side in the extruded profile. This will make one edge the newly created wiper lip is pulled into the extruded profile. On the other hand, the cutting disc comes out of the Extruded profile, where there is the new wiper lip made of the material the extruded profile is pulled out. It is clear that through one such cutting process on the doctor blade profile two different wiper lips arise. Moreover shows the sectional image created with a cutting disc arcuate cut traces on.

Der Erfindung liegt die Aufgabe zugrunde, die aufgezeigten Nachteile zu vermeiden und eine Schneidvorrichtung zu schaffen, die ein Strangprofil derart bearbeitet, dass eine durchaus mit gleichen Wischkanten versehene Wischlippe geschaffen wird. Schnittspuren im Schnittbild sollen nicht vorhanden bzw. nicht zu erkennen sein.The invention is based, which to avoid the disadvantages and a cutting device to create that processed an extruded profile in such a way that a wiping lip provided with the same wiping edges is created. cut marks the slice image should not be present or should not be recognizable.

Diese Aufgabe wird gemäß der Erfindung gelöst durch die kennzeichnenden Merkmale des Hauptanspruches.This object is achieved according to the invention solved by the characterizing features of the main claim.

Vorteilhafte Weiterbildungen des Gegenstandes des Anspruches 1 ergeben sich aus den Merkmalen der Unteransprüche sowie aus der Beschreibung und der Zeichnung.Advantageous further developments of the Subject matter of claim 1 result from the features of under claims as well as from the description and the drawing.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert.An embodiment of the invention is shown in the drawing and in the description below explained in more detail.

Es zeigen:Show it:

1 die Schneidevorrichtung auf einem Maschinenbett in Draufsicht, 1 the cutting device on a machine bed in top view,

2 einen Schnitt durch den Messerkopf, 2 a cut through the cutter head,

3 den Messerkopf in Seitenansicht und die 3 the cutter head in side view and the

4 bis 6 drei verschiedene Stellungen des Messerkopfes samt eines in den Messerkopf eingespannten Messers. 4 to 6 three different positions of the cutter head including a knife clamped in the cutter head.

Beschreibung des Ausführungsbeispielsdescription of the embodiment

Eine Schneidevorrichtung 1 hat ein Maschinenbett 2, auf dem ein Messerkopf 3 mittels einer Vorschubeinrichtung 4 in Längsrichtung hin- und hehrbeweglich ist. Die Vorschubeinrichtung 4 besteht aus einem pneumatischen Arbeitszylinder 5 und einer Führungsschiene, die fest mit dem Maschinenbett verbunden ist und auf welcher der Messerkopf 3 präzise geführt wird. Die Vorschubeinrichtung 4 kann aber auch mechanisch angetrieben werden. Am Maschinenbett 2 ist eine Festspannvorrichtung 6 mit zwei Spannschienen 7 und 8 befestigt, die zum Einspannen eines Stranghalbzeuges 9 bestimmt sind.A cutter 1 has a machine bed 2 on which a cutter head 3 by means of a feed device 4 is movable back and forth in the longitudinal direction. The feed device 4 consists of a pneumatic working cylinder 5 and a guide rail that is firmly connected to the machine bed and on which the cutter head 3 is guided precisely. The feed device 4 can also be driven mechanically. At the machine bed 2 is a clamping device 6 with two tension rails 7 and 8th attached, for clamping a strand semi-finished product 9 are determined.

Der Messerkopf 3 ist in den 2 und 3 noch einmal detaillierter dargestellt. Dabei zeigt die 2 den Messerkopf 3 im Schnitt. Vorne ist das dünne Messer 10 zu erkennen, das zwischen zwei Klemmkeilen 11 und 12 eingespannt ist. Das Messer 10 ist eine handelsübliche, gerade Industrieklinge, eine Art Rasierklinge in verstärkter Ausführung. Das Messer weist einen Keilwinkel α auf.The knife head 3 is in the 2 and 3 shown again in more detail. The shows 2 the cutter head 3 on average. In the front is the thin knife 10 to recognize that between two clamping wedges 11 and 12 is clamped. The knife 10 is a commercially available, straight industrial blade, a kind of razor blade with a reinforced design. The knife has a wedge angle α.

Ein Schwenkschlitten 13 hat einen Drehpunkt 14, der auf einer Achse 15 liegt. Auf seiner dem Messer 10 abgekehrten Seite des Schwenkschlittens 13 ist ein Elektromagnet 17 befestigt, der den Schwenkschlitten 13 mit einer Frequenz von 50 Hz. um den Drehpunkt 14 hin- und herschwingen kann. Diese Frequenz kann auch in einer anderen Größe gewählt werden. Am freien Ende 16 des Schwenkschlittens 13 ist ein Pendelgelenk 18 vorgesehen, in das ein Widerlager 20 eingreift, das gehäusefest angeordnet ist. Mittels des Widerlagers 20 kann ein Winkelausschlag ( Winkel β) des Schwenkschlittens 13 zwischen maximal und gegen Null verändert werden. Ein kappenförmiges Gehäuse 19 deckt das Innenleben des Messerkopfes 3 nach außen ab.A sleigh slide 13 has a fulcrum 14 who is on an axis 15 lies. On his knife 10 opposite side of the swivel carriage 13 is an electromagnet 17 attached to the swivel slide 13 with a frequency of 50 Hz. around the pivot point 14 can swing back and forth. This frequency can also be selected in a different size. At the free end 16 of the swivel carriage 13 is a pendulum joint 18 provided in which an abutment 20 engages, which is arranged fixed to the housing. By means of the abutment 20 can be an angular deflection (angle β) of the swivel slide 13 between maximum and zero can be changed. A cap-shaped housing 19 covers the inside of the knife head 3 to the outside.

Die Wirkungsweise der beschriebenen Schneidevorrichtung 1 soll nun anhand der 4, 5 und 6 beschrieben werden.The operation of the cutting device described 1 should now be based on the 4 . 5 and 6 to be discribed.

Die 5 zeigt den Schwenkschlitten 13 in Ruhestellung. Eine Schneide 21 des Messers 10 hat einen Mittelpunkt 22 der vom Drehpunkt 14 einen geringeren Abstand hat als jeder andere Bereich der Schneide 21.The 5 shows the swivel slide 13 at rest. A cutting edge 21 of the knife 10 has a center 22 that of the fulcrum 14 is closer than any other area of the cutting edge 21 ,

Auf diese Weise hat die Schneide 21 in der Ruhestellung des Schwenkschlittens 13 einen Abstand „A" von einer Schneidstelle 23 des Stranghalbzeuges 9.This way the cutting edge 21 in the rest position of the swivel carriage 13 a distance "A" from a cutting point 23 of the semi-finished product 9 ,

Zur Durchführung eines Schneidarbeitsganges ist das Stranghalbzeug 9 in den zwei Spannschienen 7 und 8 in einer Höhe eingespannt, die bis nahe an die Schnittebene des Messers 10 heranreicht. Diese Gegebenheit ist am besten in der 1 zu erkennen.The semi-finished product is used to carry out a cutting operation 9 in the two tension rails 7 and 8th clamped at a height that is close to the cutting plane of the knife 10 zoom ranges. This fact is best in the 1 to recognize.

Wird nun der Elektromagnet 17 eingeschaltet, so schwingt der Schwenkschlitten 13 mit einer Frequenz von 50 Hz. Es sind aber auch andere Frequenzen denkbar.Now the electromagnet 17 switched on, the swivel carriage swings 13 with a frequency of 50 Hz. However, other frequencies are also conceivable.

Die beiden 4 und 6 zeigen die jeweils maximale Auslenkung des Schwenkschlittens 13 unter Einwirkung des Elektromagneten 17. Es ist zu erkennen, dass sich der Schwenkschlitten 13 dabei um den Drehpunkt 14 dreht. Bei dieser Bewegung schneidet die Schneide 21 des Messers 10 in das Strangprofil 9 hinein, wobei ein schmaler Streifen samt Kante 24 bzw. 25 so abgeschnitten wird, dass eine neue, scharte Wischkante entsteht. Die Wischlippe des Strangprofils 9 weist zu beiden Seiten absolut gleichwertige Kantenqualität aus und ist dank der hohen Frequenz des Schneidevorganges glatt und riefenfrei. Sichtbare Schnittspuren gibt es nicht. Zur Optimierung des Schneidevorganges ist auch der Einsatz eines Schmier- oder Gleitmittels denkbar.The two 4 and 6 show the maximum deflection of the swivel slide 13 under the influence of the electromagnet 17 , It can be seen that the swivel slide 13 thereby about the pivot point 14 rotates. The cutting edge cuts during this movement 21 of the knife 10 in the extruded profile 9 into it, with a narrow strip and edge 24 respectively. 25 is cut so that a new, sharp wiping edge is created. The wiper lip of the extruded profile 9 shows absolutely equal edge quality on both sides and is smooth and free of grooves thanks to the high frequency of the cutting process. There are no visible cuts. The use of a lubricant or lubricant is also conceivable to optimize the cutting process.

11
Schneidevorrichtungcutter
22
Maschinenbettmachine bed
33
Messerkopfcutter head
44
Vorschubeinrichtungfeeder
55
Arbeitszylinderworking cylinder
66
FestspannvorrichtungChuck
77
Spannschienetensioning rail
88th
Spannschienetensioning rail
99
StranghalbzeugStrand semis
1010
Messerknife
1111
Klemmkeilclamping wedge
1212
Klemmkeilclamping wedge
1313
Schwenkschlittenpivoting slide
1414
Drehpunktpivot point
1515
Achseaxis
1616
EndeThe End
1717
Elektromagnetelectromagnet
1818
Pendelgelenkpendulum joint
1919
Gehäusecasing
2020
Widerlagerabutment
2121
Schneidecutting edge
2222
MittelpunktFocus
2323
Schneidstellecutting point
2424
Kanteedge
2525
Kanteedge

Claims (7)

Schneidevorrichtung für Stranghalbzeuge aus schneidbarem Kunststoff mit einer Festspanneinrichtung für das Stranghalbzeug und einem Messerkopf der mittels einer Vorschubeinrichtung zustellbar ist, dadurch gekennzeichnet, dass der Messerkopf (3) einen Drehpunkt (14) aufwiest, um den ein Schwenkschlitten (13) um einen gewissen Winkel ( β )hin- und herschwinkt, und dass der Drehpunkt (14) in Vorschubrichtung hinter einem Messer (10) des Messerkopfes (3) angeordnet ist.Cutting device for semi-finished products made of cutable plastic with a clamping device for the semi-finished product and a cutter head which can be adjusted by means of a feed device, characterized in that the cutter head ( 3 ) a fulcrum ( 14 ) around which a swivel carriage ( 13 ) swings back and forth by a certain angle (β) and that the pivot point ( 14 ) in the feed direction behind a knife ( 10 ) of the cutter head ( 3 ) is arranged. Schneidevorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass ein Mittelpunkt (22) der Schneide (21) vom Drehpunkt (14) einen geringeren Abstand hat als jeder andere Bereich der Schneide (21).Cutting device according to claim 1, characterized in that a center point ( 22 ) the cutting edge ( 21 ) from the fulcrum ( 14 ) is closer than any other area of the cutting edge ( 21 ). Schneidevorrichtung nach Anspruch 1 oder 2, dadurch gekenn-zeichnet, dass das Messer (10) eine gerade Schneide (21) aufweist.Cutting device according to claim 1 or 2, characterized in that the knife ( 10 ) a straight edge ( 21 ) having. Schneidevorrichtung nach einem der Ansprüche 1–3, dadurch gekennzeichnet, dass das Messer (10) einen Keilwinkel ( ) aufweist.Cutting device according to one of claims 1-3, characterized in that the knife ( 10 ) has a wedge angle (). Schneidevorrichtung nach einem der Ansprüche 1–4, dadurch gekennzeichnet, dass eine Schwing-Frequenz des Schwenkschlittens (13) etwa 50 Hz beträgt und mittels eines Elektromagneten (17) erzeugbar ist.Cutting device according to one of claims 1-4, characterized in that an oscillation frequency of the swivel carriage ( 13 ) is about 50 Hz and by means of an electromagnet ( 17 ) can be generated. Schneidevorrichtung nach einem der Ansprüche 1–5, dadurch gekennzeichnet, dass die Schneidevorrichtung (1) ein Pendelgelenk (18) aufweist und dass ein Ausschlag des Schwenkschlittens (13) mit Hilfe eines Widerlagers (20) zwischen maximal bis gegen Null veränderbar ist.Cutting device according to one of claims 1-5, characterized in that the cutting device ( 1 ) a pendulum joint ( 18 ) and that a deflection of the swivel carriage ( 13 ) with the help of an abutment ( 20 ) can be changed between a maximum of up to zero. Schneidevorrichtung nach einem der Ansprüche 1–6, dadurch gekennzeichnet, dass das Stranghalbzeug (9) zur Durchführung eines Schneidearbeitsganges zwischen zwei Spannschienen (7 und 8) in einer Höhe eingespannt ist, die bis nahe an die Schnittebene des Messers (10) heranreicht.Cutting device according to one of claims 1-6, characterized in that the strand semi-finished product ( 9 ) to perform a cutting operation between two clamping rails ( 7 and 8th ) is clamped at a height that is close to the cutting plane of the knife ( 10 ).
DE200420004815 2004-03-27 2004-03-27 Jig for trimming blade of screen printing scraper has the blade clamped and cut by an oscillating blade fitted to a slider Expired - Lifetime DE202004004815U1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE200420004815 DE202004004815U1 (en) 2004-03-27 2004-03-27 Jig for trimming blade of screen printing scraper has the blade clamped and cut by an oscillating blade fitted to a slider

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200420004815 DE202004004815U1 (en) 2004-03-27 2004-03-27 Jig for trimming blade of screen printing scraper has the blade clamped and cut by an oscillating blade fitted to a slider

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DE202004004815U1 true DE202004004815U1 (en) 2004-06-24

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015031422A1 (en) * 2013-08-28 2015-03-05 Corning Incorporated System and method for cutting a wet green ceramic article
CN114633299A (en) * 2022-03-29 2022-06-17 安徽沙丰新材料有限公司 Zinc stearate production line of slicing mechanism machine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015031422A1 (en) * 2013-08-28 2015-03-05 Corning Incorporated System and method for cutting a wet green ceramic article
CN105682871A (en) * 2013-08-28 2016-06-15 康宁股份有限公司 System and method for cutting a wet green ceramic article
US10252441B2 (en) 2013-08-28 2019-04-09 Corning Incorporated System and method for cutting a wet green ceramic article
CN114633299A (en) * 2022-03-29 2022-06-17 安徽沙丰新材料有限公司 Zinc stearate production line of slicing mechanism machine
CN114633299B (en) * 2022-03-29 2022-09-30 安徽沙丰新材料有限公司 Slicing mechanism and zinc stearate production line

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R207 Utility model specification

Effective date: 20040729

R150 Term of protection extended to 6 years

Effective date: 20071017

R151 Term of protection extended to 8 years

Effective date: 20101014

R158 Lapse of ip right after 8 years

Effective date: 20121002