DE1924022A1 - Molding tool with shut-off device for the production of bodies from highly reactive, hardenable multi-component systems - Google Patents
Molding tool with shut-off device for the production of bodies from highly reactive, hardenable multi-component systemsInfo
- Publication number
- DE1924022A1 DE1924022A1 DE19691924022 DE1924022A DE1924022A1 DE 1924022 A1 DE1924022 A1 DE 1924022A1 DE 19691924022 DE19691924022 DE 19691924022 DE 1924022 A DE1924022 A DE 1924022A DE 1924022 A1 DE1924022 A1 DE 1924022A1
- Authority
- DE
- Germany
- Prior art keywords
- shut
- mold
- highly reactive
- production
- molding tool
- 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.)
- Pending
Links
- 238000000465 moulding Methods 0.000 title claims description 12
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 229920003023 plastic Polymers 0.000 claims description 8
- 239000004033 plastic Substances 0.000 claims description 8
- 238000005192 partition Methods 0.000 claims description 3
- 208000015943 Coeliac disease Diseases 0.000 description 14
- 238000002156 mixing Methods 0.000 description 9
- 239000000203 mixture Substances 0.000 description 5
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000011541 reaction mixture Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
Classifications
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/58—Moulds
- B29C44/581—Closure devices for pour holes
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/0061—Moulds or cores; Details thereof or accessories therefor characterised by the configuration of the material feeding channel
-
- 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
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/24—Feeding the material into the mould
-
- 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
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/26—Moulds or cores
- B29C39/30—Moulds or cores with means for cutting the article
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/28—Closure devices therefor
-
- 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
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/24—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material
- B29C67/246—Moulding high reactive monomers or prepolymers, e.g. by reaction injection moulding [RIM], liquid injection moulding [LIM]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
LE VE RKU S E N · Bayerwerk Pmnt-Abteilung Mr/lOLE VE RKU S E N · Bayerwerk Pmnt department Mr / lO
Formwerkzeug mit Absperrvorrichtung zur Herstellung von Körpern aus hochreaktiven, aushärtbaren Mehrkomponentensystemen. ' Molding tool with shut-off device for the production of bodies from highly reactive, curable multi-component systems. '
Die vorliegende Erfindung richtet sich auf ein Formwerkzeug mit Absperrvorrichtung für die Herstellung von Körpern aus hochreaktiven aushärtbaren Mehrkomponentenkunststoffsystemen, bestehend aus zwei Formteilen, wobei eines der beiden Formteile mit einem Angußkanal versehen isttThe present invention is directed to a molding tool with shut-off device for the production of bodies from highly reactive curable multi-component plastic systems, consisting of two molded parts, one of the two molded parts with a sprue channel is provided
Bei solchen Systemen besteht die Aufgabe, das hochreaktive Kunststoffsystem in eine Formhöhlung, gegebenenfalls unter Druck, einzutragen und mit möglichst geringem Materialverlust kurzfristig die Form, möglichst angußlos, zu füllen und abzuschließen.In such systems there is the task of the highly reactive Plastic system to be entered into a mold cavity, if necessary under pressure, and with as little as possible Loss of material in the short term to fill and seal the mold, if possible without sprues.
Es ist notwendig, das Mischaggregat und das Eintragsystem von den Resten des hochreaktiven Mehrkomponentensystems zu säubern, da sonst die Gefahr besteht, daß der Kunststoff im Misch- und Eintragsystem aushärtet und damit zu Verstopfungen führt. Diese Aufgaben werden bislang sehr unvollkommen auf verschiedene'Art und Weise gelöst. It is necessary to have the mixing unit and the entry system to clean off the residues of the highly reactive multi-component system, otherwise there is a risk of the plastic hardens in the mixed and entry system and thus to blockages leads. These tasks have so far been very imperfectly achieved in various ways.
Man hat beispielsweise das Mischaggregat direkt an die Einfüllöffnung des Formkastens gehalten, dann schnell auf Seite geschwenkt und die Öffnung durch einen einzuschlagenden Pfropfen verschlossen. Naturgemäß tritt hler-For example, the mixing unit was held directly against the filling opening of the molding box, then quickly swiveled to one side and the opening closed by a plug to be hammered in. Naturally,
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BAD ORIGINALBATH ORIGINAL
009846/1514009846/1514
bei ein beachtlicher Materialverlust durch Auslaufen des Reaktionsgemisches aus dem Formwerkzeug auf.'weiterhin istes möglich, Rückschlagventile, beispielsweise Kugelventile, zwischen Mischaggregat und Formkasten einzusetzen. Sie besitzen jedoch den Nachteil, daß im Ventil verbleibendes hochreaktives Gemisch aushärtet. Das Ventil muß somit nach jedem Arbeitsgang wieder gesäubert werden. Eine andere Möglichkeit besteht darin, daß ein mit einem Flachschieber versehenes Kupplungsstück zwischen Mischaggregat und Formenanguß eingesetzt wird. Hierbei ist eine exakte Dosierung möglich. Materialverlust durch Auslaufen des ^ hochreaktiven Gemisches aus dem Formkasten tritt nicht auf, jedoch polymerisiert der Kunststoff formenseitig zwischen Anguß und Schieber, so daß nach jedem Dosiervorgang das Kupplungsteil einschließlich Schieber mechanisch gereinigt werden muß.in the case of a considerable loss of material due to the reaction mixture running out of the mold possible to use check valves, for example ball valves, between the mixing unit and molding box. she however, have the disadvantage that the highly reactive mixture remaining in the valve hardens. The valve must therefore after be cleaned every time you work. Another possibility is that one with a flat slide provided coupling piece between mixing unit and Mold gate is used. Exact dosing is possible here. Loss of material due to leakage of the ^ highly reactive mixture from the molding box does not occur, however, the plastic polymerizes on the mold side between the sprue and slide, so that after each dosing process the Coupling part including slide must be cleaned mechanically.
Man ist auch dazu übergegangen, Dreiwegehähne einzusetzen. Das hat den Vorteil, daß eine exakte Dosierung des Gemisches in die Form ohne nachträgliches Auslaufen gewährleistet . ist. Es ist jedoch nicht möglich,ein Dreiwegehahnküken in Spülstellung zu säubern, da eine Bohrung, in welcher sich reagierendes Gemisch befindet, vom Spülmedium nicht erfaßt wird. Als weiterer Nachteil eines W Dreiwegehahns ist die formseitige Kupplung anzusehen, die für die Säuberung sehr ungünstig ausgebildet ist und welche verlangt, daß nach jedem Dosiervorgang der Dreiwegehahn zumindest abgeschraubt werden muß und das verbleibende, in der Zwischenzeit zu einem Kunststoff ausreagierte Produkt mechanisch entnommen werden muß.There has also been a move towards using three-way cocks. This has the advantage that it ensures that the mixture is precisely metered into the mold without subsequent leakage. is. However, it is not possible to clean a three-way stopcock in the flushing position, since a hole in which there is a reactive mixture is not covered by the flushing medium. Another disadvantage of a W three-way valve is the coupling on the mold side, which is very unfavorable for cleaning and which requires that the three-way valve at least be unscrewed after each dispensing process and the remaining product, which has since reacted to a plastic, must be removed mechanically .
Außerdem besteht die Möglichkeit, Formabsperrhähne zu verwenden, die als Winkelhähne ausgebildet sind und in Arbeits-It is also possible to use molded stopcocks, which are designed as angled taps and in working
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BAD 0 0 98A6/15UBATHROOM 0 0 98A6 / 15U
stellung den Weg vom Mischaggregat zum Formkasten und in Spülstellung den. Weg vom Mischaggregat zu einer Spülbohrung freigeben. Bei dieser und anderen bisher vorgeschlagenen Lösungen ist die Entstehung eines Angußkanale s zwischen Formabsperrvorrichtung und Formhöhlung nicht zu umgehen. Angüsse an fertigen Formteilen bedürfen aber einer Nachbearbeitung. Ihre Entfernung kann außerdem, z.B. bei geschäumten Kunststoffen, zu Fehlstellen führen, weil dann an der Angußstelle die sogenannte Schaumhaut fehlt.position the way from the mixing unit to the molding box and in the rinsing position the. Away from the mixing unit to a flushing hole release. In this and other solutions proposed so far, the formation of a runner is between Mold shut-off device and mold cavity cannot be bypassed. However, sprues on finished molded parts require post-processing. Their removal can also lead to defects, e.g. in the case of foamed plastics, because then the so-called foam skin is missing at the gate.
Aufgrund der vorher beschriebenen Nachteile ist es nicht möglich, in einem rationellen Verfahren vorhandene Formhohlräume angußlos auszufüllen. Diese Mängel behebt die vorliegende Erfindung dadurch, daß die Absperrvorrichtung aus einem Absperrkolben besteht, der in einer Bohrung verschiebbar geführt ist, und in Schließstellung mit seiner Stirnfläche gegen eine zwischen dem Angußkanal und Formhohlraum angeordnete Trennwand anliegt.Because of the disadvantages described above, it is not possible to use existing mold cavities in a rational process To be filled in without sprue. The present invention overcomes these deficiencies in that the shut-off device consists of a shut-off piston which is guided displaceably in a bore, and in the closed position with its End face rests against a partition arranged between the sprue channel and mold cavity.
In der Öffnungsstellung des Absperrkolbens ist der Angußkanal über dem freigegebenen Raum der Bohrung mit der Formhöhlung verbunden. Das Reaktionsgemisch nimmt diesen Weg vom Mischaggregat in die Formhöhlung. Nach Beendigung des Füllvorganges schließt der Absperrkolben den Formhohlraum ab. In Schließstellung des Absperrkolbens wird das Mischaggregat vom Angußkanal getrennt und gespült. In der Zwischenzeit kann das im Angußkanal befindliche, inzwischen ausgehärtete Kunststoffstück nach dem öffnen des Formkastens entfernt werden.The sprue channel is in the open position of the shut-off piston connected to the cavity via the released space of the bore. The reaction mixture takes this route from the mixing unit into the mold cavity. After completion of the filling process, the shut-off piston closes the mold cavity away. When the shut-off piston is in the closed position, the mixing unit is separated from the sprue and flushed. In the meantime can the now hardened plastic piece located in the sprue channel after opening the molding box removed.
Vorzugsweise liegt die Achse des Angußkanals in der Trennebene der Formteile. Das hat den Vorteil, daß Formkasten und Absperrvorrichtung für diese Anordnung am einfachsten herstellbar sind* Auch die Entnahme des Angußstücks aus dem Angußkanal ist hierbei besonders einfach.The axis of the runner preferably lies in the parting plane of the molded parts. This has the advantage that The molding box and shut-off device for this arrangement are easiest to manufacture * Also the removal of the sprue from the runner is particularly easy here.
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In vorteilhafter Weise ist die Stirnfläche des Absperrkolbens der Kontur der Pormwandung angepaßt. Dies ist insbesondere der Fall, wenn dies die Kontur des herzustellenden Körpers erfordert oder wenn wegen des Luftabzugs aus der" Formhöhlung die Angußstelle nur an einer bestimmten Stelle des Formkastens anzuordnen ist.The end face of the shut-off piston is advantageous adapted to the contour of the Pormwandung. This is especially the case if this is the contour of the item to be manufactured Body requires or if because of the air extraction from the "mold cavity the gate point only at one a certain point of the molding box is to be arranged.
Anhand einer Zeichnung sei nun das Formwerkzeug gemäß der Erfindung dargestellt und zwar ausschnittsweise mit der Absperrvorrichtung. Es zeigen:Using a drawing, let the molding tool according to FIG Invention shown and in detail with the shut-off device. Show it:
Figur 1 die Schließstellung
* Figur 2 die Füllstellung.Figure 1 the closed position
* Figure 2 the filling position.
Das Formwerkzeug 1 besteht aus dem TJnterformteil 2 und dem Oberformteil 3, die die Formhöhlung 4 einschließen. Im Unterformteil 2 ist ein Angußkanal 5 angeordnet, dessen Achse an der Trennebene der beiden Formteile 2 und 3 liegt. Das angedeutete Angußrohr 6 des Mischaggregates (nicht dargestellt) mundet in den Angußkanal 5.The mold 1 consists of the TInterformteil 2 and the upper mold part 3, which enclose the mold cavity 4. A sprue channel 5 is arranged in the lower mold part 2, whose axis lies on the parting plane of the two molded parts 2 and 3. The indicated sprue pipe 6 of the mixing unit (not shown) opens into the sprue channel 5.
Im Oberformteil 2 ist eine Absperrvorrichtung 7 angeordnet. Sie besteht aus dem Absperrkolben 8, der über ein Hydrau- ^ liksystem 9 in einer Bohrung 10 verschiebbar ist. In der " Schließstellung (Figur 1) liegt die Stirnfläche 11 des Absperrkolbens 8 gegen eine zwischen Angußkanal 5 und Formhöhlung 4 angeordnete Trennwand 12 an. In der Füllstellung (Figur 2) gibt der Absperrkolben 8 den Raum 13 der Bohrung 10 frei für den Einlauf des Gemisches.A shut-off device 7 is arranged in the upper mold part 2. It consists of the shut-off piston 8, which is ^ liksystem 9 is displaceable in a bore 10. In the "closed position" (FIG. 1), the end face 11 of the Shut-off piston 8 against a partition 12 arranged between the sprue channel 5 and mold cavity 4. In the filling position (Figure 2) the shut-off piston 8 is the space 13 of the bore 10 free for the inlet of the mixture.
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0.098*6/ 15U BADORiGlNAL0.098 * 6 / 15U BADORiGlNAL
Claims (3)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19691924022 DE1924022A1 (en) | 1969-05-10 | 1969-05-10 | Molding tool with shut-off device for the production of bodies from highly reactive, hardenable multi-component systems |
| FR7016843A FR2047503A5 (en) | 1969-05-10 | 1970-05-08 | Moulding tool with shut-off device for the - production of bodies from highly reactive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19691924022 DE1924022A1 (en) | 1969-05-10 | 1969-05-10 | Molding tool with shut-off device for the production of bodies from highly reactive, hardenable multi-component systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1924022A1 true DE1924022A1 (en) | 1970-11-12 |
Family
ID=5733895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19691924022 Pending DE1924022A1 (en) | 1969-05-10 | 1969-05-10 | Molding tool with shut-off device for the production of bodies from highly reactive, hardenable multi-component systems |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE1924022A1 (en) |
| FR (1) | FR2047503A5 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0240753A2 (en) * | 1986-04-04 | 1987-10-14 | PEBRA GmbH Paul Braun | Method and apparatus for producing moulded plastic articles |
| WO2007045357A1 (en) * | 2005-10-18 | 2007-04-26 | Bayer Materialscience Ag | Mould for the production of plastic mouldings by the reaction injection-moulding process |
| WO2019238354A1 (en) * | 2018-06-13 | 2019-12-19 | Bbg Gmbh & Co. Kg | Mold having a sprue cutter |
-
1969
- 1969-05-10 DE DE19691924022 patent/DE1924022A1/en active Pending
-
1970
- 1970-05-08 FR FR7016843A patent/FR2047503A5/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0240753A2 (en) * | 1986-04-04 | 1987-10-14 | PEBRA GmbH Paul Braun | Method and apparatus for producing moulded plastic articles |
| DE3611249A1 (en) * | 1986-04-04 | 1987-10-15 | Braun Pebra Gmbh | METHOD AND DEVICE FOR THE PRODUCTION OF PLASTIC MOLDED PARTS |
| EP0240753A3 (en) * | 1986-04-04 | 1989-07-26 | Pebra Gmbh Paul Braun | Method and apparatus for producing moulded plastic articles |
| WO2007045357A1 (en) * | 2005-10-18 | 2007-04-26 | Bayer Materialscience Ag | Mould for the production of plastic mouldings by the reaction injection-moulding process |
| WO2019238354A1 (en) * | 2018-06-13 | 2019-12-19 | Bbg Gmbh & Co. Kg | Mold having a sprue cutter |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2047503A5 (en) | 1971-03-12 |
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