DE2157132A1 - Injection moulding hollow articles prodn - with components welded following moulding - Google Patents

Injection moulding hollow articles prodn - with components welded following moulding

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Publication number
DE2157132A1
DE2157132A1 DE19712157132 DE2157132A DE2157132A1 DE 2157132 A1 DE2157132 A1 DE 2157132A1 DE 19712157132 DE19712157132 DE 19712157132 DE 2157132 A DE2157132 A DE 2157132A DE 2157132 A1 DE2157132 A1 DE 2157132A1
Authority
DE
Germany
Prior art keywords
mold
mold halves
cavities
mold core
injection
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
Application number
DE19712157132
Other languages
German (de)
Inventor
Georg Narten
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NARTEN FA GEORG
Original Assignee
NARTEN FA GEORG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NARTEN FA GEORG filed Critical NARTEN FA GEORG
Priority to DE19712157132 priority Critical patent/DE2157132A1/en
Publication of DE2157132A1 publication Critical patent/DE2157132A1/en
Pending legal-status Critical Current

Links

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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
    • B29C45/006—Joining parts moulded in separate cavities
    • 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
    • B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
    • B29C45/006—Joining parts moulded in separate cavities
    • B29C2045/0072—Joining parts moulded in separate cavities the parts to be joined being moulded in a stack mould

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

In the method a pair of half moulds has a core to provide a pair of injection moulding cavities which are filled with plastics material using one or two injection heads, the mould is opened to remove the core, the mould is closed and the injection moulded article halves are welded along the abutting edges.

Description

Verfahren und Vorrichtung zum Herstellen von Hohlkörpern im Spritzgußverfahren Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Herstellen von Hohlkörpern im Spritzgußverfahren. Method and device for the production of hollow bodies by injection molding The invention relates to a method and a device for producing hollow bodies in the injection molding process.

Zum Herstellen von Kunststoffteilen im Spritzgußverfahren sind eine Reihe von Vorrichtungen der unterschiedlichsten Bauweise bekannt. Mit den bekannten Spritzgußmaschinen, die aus einer Plastifizier-Einheit, einer Formen-Zuhaltepresse und den Formhälften mit den dazu erforderlichen Zubehörteilen bestehen, ist es aber nicht möglich, geschlossene Hohlkörper herzustellen.For the production of plastic parts by injection molding are one Known number of devices of the most varied construction. With the known Injection molding machines consisting of a plasticizing unit, a mold locking press and the mold halves with the necessary accessories exist, but it is not possible to produce closed hollow bodies.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zum Herstellen von Hohlkörpern im Spritzgußverfahren zu schaffen, bei dem insbesondere auch die bekannten Spritzgußmaschinen verwendet werden können, sowie eine Vorrichtung zur Durchführung dieses Verfahrens, die äußerst einfach ausgebildet ist und bei Verwendung in den bekannten Spritzgußmaschinen praktisch keine Änderungen der Maschine selbst erfordert.The invention is based on the object of a method for manufacturing to create hollow bodies in the injection molding process, in particular also the known injection molding machines can be used, as well as a device for Carrying out this procedure which is extremely simple and in use in the known injection molding machines practically no changes to the machine itself requires.

Dies wird nach der Erfindung im wesentlichen dadurch erreicht, daß der zwischen Formhälften gebildete Hohlraum durch einen zwischen diesen angeordneten Formkern in zwei Hohlräume für die Ausbildung zweier Spritzlingsteile getrennt und in diese Hohlräume Spritzgußmasse eingespritzt wird, worauf nach Beendigung des Einspritzvorganges die Formhälften kurz geöffnet werden und der Formkern zwischen diesen herausgezogen wird. Vorzugsweise werden die Formhälften sofort nach Entfernen des Formkerns mit Druck zusammengefahren und die Ränder sowie evtl. in den Formen vorgesehene Rippen der Spritzlängsteile an den BerUhrungsstellen zur Ausbildung des Hohlkörpers homogen verschweißt.This is achieved according to the invention essentially in that the cavity formed between mold halves by a cavity arranged between them Mold core separated into two cavities for the formation of two injection molded parts and Injection molding compound is injected into these cavities, whereupon after completion of the Injection process the mold halves are opened briefly and the mold core between this is pulled out. Preferably, the mold halves are immediately removed of the mold core moved together with pressure and the edges and possibly in the molds provided ribs of the longitudinal spray parts at the points of contact for training of the hollow body welded homogeneously.

Damit wird durch Zwischenschaltung eines herausziehbaren Formkernes zwischen den Formhälten und durch Abänderung der Zyklusfolge einer üblichen Spritzgußmaschine ein Vrerfahren zum Herstellen von geschlossenen Hohlkörpern gebildet, das eine hohe Taktfolge ermöglicht.This is done by interposing a pull-out mold core between the mold halves and by changing the cycle sequence of a conventional injection molding machine a process for the production of closed hollow bodies formed, which has a high Clock sequence enables.

Die hierzu verwendete Vorrichtung, bei der zwischen den Formhä#en ein Formkern herausnehmbar angeordnet ist, der den Hohlraum zwischen den geschlossenen Formhälften in zwei getrennte Hohlräume derart unterteilt, daß an den in diesen getrennten Hohlräumen ausbildbaren Spritzlingsteilen einander gegenüberliegende, verschweißbare Ränder vorhanden sind, ist in ihrem Aufbau äußerst einfach und ein ohne weiteres in einer bekannten Spritzgußmaschine eingebaut werden.The device used for this purpose, in which between the mold heads a mold core is removably arranged, the cavity between the closed Mold halves divided into two separate cavities in such a way that the in these separate cavities formable injection molding parts opposite one another, weldable The presence of margins is extreme in their construction easily and easily installed in a known injection molding machine.

Nachfolgend wird die Erfindung anhand der Zeichnung beispielsweise näher erläutert.The invention is exemplified below with reference to the drawing explained in more detail.

Fig. 1 bis 4 zeigen bei einer schematisch dargestellten Vorrichtung den Arbeitszyklus bei dem erfindungsgemäßen Verfahren. 1 to 4 show a device shown schematically the working cycle in the method according to the invention.

Fig. 5 stellt gleichfalls schematisch eine andere Ausführungsform einer Vorrichtung dar. Fig. 5 also schematically shows another embodiment a device.

In Fig. 1 sind mit 1 und 2 Formhälften bezeichnet, zwischen denen ein Formkern 3 in der Weise angeordnet ist, daß der durch die beiden Formhälten gebildete Hohlraum in zwei #-trennte Hohlräume unterteilt wird, in denen Spritzlingshälften 6 und 7 ausgebildet werden können. An den beiden Formhälften ist jeweils eine Plastifizier-Einheit 4 bzw. 5 angeschlossen. Der Formkern 3, der beiderseits längs seines Außenumfangs mit einem Ansatz versehen ist, mit dem er an der betreffenden Formhälfte anliegt, ist im Querschnitt so gestaltet, daß er - abgesehen von der größeren Dickenabmessung - dem in dem herzustellenden Hohlkörper 8 auszubildenden Hohlraum entspricht und an den Spritzlingshälften 6, 7 einander gegenüberliegende, verschweißbare Ränder ausbildet.In Fig. 1, 1 and 2 mold halves are designated, between which a mold core 3 is arranged in such a way that the through the two mold halves The cavity formed is divided into two # -separated cavities in which the molded part halves 6 and 7 can be formed. There is a plasticizing unit on each of the two mold halves 4 or 5 connected. The mold core 3, on both sides along its outer circumference is provided with a shoulder with which it rests on the relevant mold half, is designed in cross-section so that it - apart from the greater thickness dimension - Corresponds to the cavity to be formed in the hollow body 8 to be produced and on the molded part halves 6, 7 mutually opposite, weldable edges trains.

Zunächst wird der Formkern 3 zwischen die beiden Formhälften 1, 2 eingesetzt, worauf diese geschlossen und die beiden Plastifiziereinheiten 4, 5 an die Formhälften herangefahren werden. In diesem in Fig. 1 dargestellten Zustand wird die Spritzgußmasse in die Hohlräume eingespritzt.First, the mold core 3 is placed between the two mold halves 1, 2 used, whereupon this closed and the two plasticizing units 4, 5 on the mold halves are brought up. In this state shown in FIG the injection molding compound is injected into the cavities.

Bei dem in Fig. 2 dargestellten zweiten Arbeitszyklus werden nach Beendigung des Einspritzvorganges die Formhälften 1, 2 kurz auseinandergefahren, worauf der Formkern 3 herausgezogen wird.In the second working cycle shown in Fig. 2 are after Completion of the injection process, the mold halves 1, 2 are briefly moved apart, whereupon the mandrel 3 is pulled out.

Unmittelbar darauf werden im dritten Arbeitszyklus die Formhälften 1, 2 schnell geschlossen und die Ränder der beiden in den Formhälften befindlichen Spritzlingsteile 6, 7, die noch Schweißwärme besitzen, zusammengepreßt, so daß ein Verschweißen dieser Ränder und evtl. in den Formhälften vorgesehener Rippen miteinander erfolgt, wie Fig. 3 zeigt. Auf diese Weise wird der Hohlkörper 8 ausgebildet.Immediately afterwards, the mold halves are made in the third work cycle 1, 2 quickly closed and the edges of the two located in the mold halves Injection molding parts 6, 7, which still have welding heat, pressed together, so that a Welding these edges and possibly ribs provided in the mold halves to one another takes place, as Fig. 3 shows. In this way, the hollow body 8 is formed.

Bei dem in Fig. 4 dargestellten vierten Arbeitszyklus werden darauf die FormhäZten 1, 2 auseinandergefahren, so daß der fertige Hohlkörper 8 entnommen werden kann.In the fourth working cycle shown in FIG the molds 1, 2 moved apart so that the finished hollow body 8 is removed can be.

Die Verwendung von zwei Plastifiziereinheiten 4, 5 -wie in Fig. 1 angedeutets hat den Vorteil, #ß der Hohlkörper 8 aus verschiedenfarbigen Hälften und ggfs.The use of two plasticizing units 4, 5 - as in Fig. 1 indicated has the advantage # ß the hollow body 8 from different colored halves and possibly

verschiedenartigen Kunststoffen hergestellt werden kann.various plastics can be produced.

Bei der in Fig. 5 dargestellten Ausführungsform ist nur eine Plastifizier-Einheit vorgesehen, durch welche die Einspritzung der plastifizierten Kunststoffmasse in die Hohlräume zwischen den Formhälften 1, 2 und dem Formkern 3 über einen auf den Umfang des Formkerns 3 vorgesehenen Anguß erfolgt.In the embodiment shown in FIG. 5, there is only one plasticizing unit provided, through which the injection of the plasticized plastic mass in the cavities between the mold halves 1, 2 and the mold core 3 via a on the Scope of the mold core 3 provided sprue takes place.

Claims (6)

Patentansprüche Claims r Verfahren zum Ilerstellen von geschlossenen Hohlkörpern im Spritzgußverfahren, dadurch gekennzeichnet, daß der zwischen Formhälften (1, 2) gebildete Hohlraum durch einen zwischen diesen angeordneten Formkern (3) in zwei Hohlräume für die Ausbildung zweier Spritzlingsteile (6, 7) getrennt und in diese Hohlräume Spritzgußmasse eingespritzt wird, worauf nach Beendigung des Einspritzvorganges die Formhälften kurz geöffnet werden und der Formkern zwischen diesen herausgezogen wird.r process for the creation of closed hollow bodies in the injection molding process, characterized in that the cavity formed between mold halves (1, 2) through a mold core (3) arranged between these in two cavities for the training two injection molded parts (6, 7) are separated and injection molding compound is injected into these cavities whereupon the mold halves are briefly opened after the injection process has ended and the mandrel is pulled out between them. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Formhälften (1, 2) sofort nach Entfernen des Formkerns (3) mit Druck zusammengefahren und die Ränder sowie evtl. in den Formen vorgesehene Rippen der Spritzlingsteile (6, 7) an den Benihrungsstellen zur Ausbildung des Hohlkörpers (8) homogen verschweißt werden.2. The method according to claim 1, characterized in that the mold halves (1, 2) together with pressure immediately after removing the mold core (3) and the Edges and possibly ribs of the molded parts provided in the molds (6, 7) welded homogeneously at the contact points to form the hollow body (8) will. 3. Verfahren nach den Ansprüchen 1 und 2,dadurch gekennzeichnet, daß die Hohlräume zwischen den Formhälften (1, 2) und dem Formkern (3) durch zwei Plastifizier-Einheiten (4, 5) mit Spritzgußmasse gefüllt werden.3. Process according to claims 1 and 2, characterized in that the cavities between the mold halves (1, 2) and the mold core (3) by two plasticizing units (4, 5) are filled with injection molding compound. 4. Verfahren nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die Hohlräume zwischen den Formhälften (1, 2) und dem Formkern (3) von nur einer Plastifizier-Einheit (4) über einen im Formkern vorgesehenen Anguß gefüllt werden.4. The method according to claims 1 and 2, characterized in that that the cavities between the mold halves (1, 2) and the mold core (3) of only one The plasticizing unit (4) can be filled via a sprue provided in the mold core. 5. Vorrichtung zur Durchführung des Verfahrens nach den vorhergehenden Ansprüchen, dadurch gekennzeichnet, daß zwischen den Formhälften (1, 2) ein Formkern (3) herausnehmbar angeordnet ist, der den Hohlraum zwischen den geschlossenen Formhälften in zwei getrennte Hohlräume derart unterteilt, daß an den in diesen getrennten Hohlräumen ausbildbaren Spritzlingsteilen (6,7) einander gegenüberliegende, verschweißbare Ränder vorhanden sind.5. Device for performing the method according to the preceding Claims, characterized in that a mold core between the mold halves (1, 2) (3) is removably arranged, the the cavity between the closed mold halves divided into two separate cavities in such a way that on the cavities separated in these Formable injection molded parts (6,7) opposite one another, weldable Margins are present. 6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß die Formhälften (1, 2) und/oder der Formkern (3) zur Aufrechterhaltung der erforderlichen Wärme zum homogenen Verschweißen der Ränder und evtl. vorgesehener Rippen mit entsprechenden Heiz- und Kühlkanälen versehen sind.6. Apparatus according to claim 5, characterized in that the mold halves (1, 2) and / or the mold core (3) to maintain the required heat for homogeneous welding of the edges and possibly provided ribs with corresponding Heating and cooling channels are provided.
DE19712157132 1971-11-17 1971-11-17 Injection moulding hollow articles prodn - with components welded following moulding Pending DE2157132A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19712157132 DE2157132A1 (en) 1971-11-17 1971-11-17 Injection moulding hollow articles prodn - with components welded following moulding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2432382A1 (en) * 1978-08-04 1980-02-29 Desma Werke Gmbh PROCESS AND APPARATUS FOR MANUFACTURING MOLDED PARTS FROM AT LEAST TWO PARTS, IN PARTICULAR BY INJECTION OF RUBBER-LIKE MATERIALS
FR2530178A1 (en) * 1982-07-16 1984-01-20 Ceraver Method for manufacturing hollow ceramic parts by injection.
FR2537915A1 (en) * 1982-12-17 1984-06-22 Esswein Sa Process for moulding an article made from thermoplastic material and device for implementing it
FR2574018A1 (en) * 1984-12-05 1986-06-06 Lalloz Guy PROCESS FOR MANUFACTURING A HOLLOW BODY-SHAPED PART, FOR EXAMPLE OF EXPANDED POLYSTYRENE, FROM SEVERAL ELEMENTARY PIECES, AND A PIECE THUS OBTAINED
EP0293034A2 (en) * 1987-05-29 1988-11-30 Armenak Moumdjian Pneumatic sole for footwear and a corresponding mould and moulding method
FR2664848A1 (en) * 1990-07-18 1992-01-24 Kloeckner Ferromatik Desma METHOD AND DEVICE FOR THE INJECTION MOLDING OF RUBBER SOLE.
DE4241409A1 (en) * 1992-12-09 1994-06-16 Josef Gleixner Bonding together non-manually e.g. two plastic mouldings - by injection moulding two separate parts on one operation, moving mould tools to bring them together, and closing mould to bond them together
EP0733464A2 (en) * 1995-03-16 1996-09-25 SUMITOMO WIRING SYSTEMS, Ltd. Method of and mold for producing resin-molded product
EP0733463A2 (en) * 1995-03-10 1996-09-25 Sumitomo Wiring Systems, Ltd. Manufacturing method of resin molded assembly, manufacturing metal mold, and resin molded assembly manufactured thereby
DE19647968C1 (en) * 1996-11-20 1998-03-05 Battenfeld Extrusionstech Extruding hollow profiles of high cross=sectional accuracy
WO1998040195A1 (en) * 1997-03-13 1998-09-17 Filterwerk Mann+Hummel Gmbh Process for manufacturing hollow plastic objects
EP0867266A2 (en) * 1997-03-26 1998-09-30 Takata Corporation Resin bag and manufacturing method thereof
EP1044780A1 (en) * 1999-04-09 2000-10-18 Forsheda AB A method and an injection moulding machine for manufacturing products consisting of at least two product portions connected with each other
EP1484162A1 (en) * 2003-06-04 2004-12-08 Weener Plastik GmbH & Co. KG Method of manufacturing a plastic body and container
DE19615309B4 (en) * 1996-04-18 2005-02-10 Friedrich Hachtel Method, injection-molded body and injection mold for producing an injection-molded body
DE102005051230A1 (en) * 2005-10-26 2007-05-03 Exaflow Gmbh & Co. Kg Injection molding machine has at least two mold inserts separated by intermediate contour plates which are removed after injection, inserts then being fastened together

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2432382A1 (en) * 1978-08-04 1980-02-29 Desma Werke Gmbh PROCESS AND APPARATUS FOR MANUFACTURING MOLDED PARTS FROM AT LEAST TWO PARTS, IN PARTICULAR BY INJECTION OF RUBBER-LIKE MATERIALS
FR2530178A1 (en) * 1982-07-16 1984-01-20 Ceraver Method for manufacturing hollow ceramic parts by injection.
FR2537915A1 (en) * 1982-12-17 1984-06-22 Esswein Sa Process for moulding an article made from thermoplastic material and device for implementing it
FR2574018A1 (en) * 1984-12-05 1986-06-06 Lalloz Guy PROCESS FOR MANUFACTURING A HOLLOW BODY-SHAPED PART, FOR EXAMPLE OF EXPANDED POLYSTYRENE, FROM SEVERAL ELEMENTARY PIECES, AND A PIECE THUS OBTAINED
EP0184503A2 (en) * 1984-12-05 1986-06-11 SAPLEST S.A. Société dite: Method for forming a hollow article, and article obtained
EP0184503A3 (en) * 1984-12-05 1987-12-16 SAPLEST S.A. Société dite: Method for forming a hollow article, and article obtained
EP0293034A2 (en) * 1987-05-29 1988-11-30 Armenak Moumdjian Pneumatic sole for footwear and a corresponding mould and moulding method
EP0293034A3 (en) * 1987-05-29 1990-11-22 Armenak Moumdjian Pneumatic sole for footwear and a corresponding mould and moulding method
FR2664848A1 (en) * 1990-07-18 1992-01-24 Kloeckner Ferromatik Desma METHOD AND DEVICE FOR THE INJECTION MOLDING OF RUBBER SOLE.
DE4241409A1 (en) * 1992-12-09 1994-06-16 Josef Gleixner Bonding together non-manually e.g. two plastic mouldings - by injection moulding two separate parts on one operation, moving mould tools to bring them together, and closing mould to bond them together
DE4241409C2 (en) * 1992-12-09 1998-07-23 Josef Gleixner Method and device for producing a component by injection molding at least two plastic elements and by joining these elements together after injection molding
EP0733463B1 (en) * 1995-03-10 2002-11-13 Sumitomo Wiring Systems, Ltd. Manufacturing method of resin molded assembly and manufacturing metal mold
EP0733463A2 (en) * 1995-03-10 1996-09-25 Sumitomo Wiring Systems, Ltd. Manufacturing method of resin molded assembly, manufacturing metal mold, and resin molded assembly manufactured thereby
EP0733464A3 (en) * 1995-03-16 1997-12-29 SUMITOMO WIRING SYSTEMS, Ltd. Method of and mold for producing resin-molded product
US5915760A (en) * 1995-03-16 1999-06-29 Sumitomo Wiring Systems, Ltd. Method of producing resin-molded product
US6206681B1 (en) 1995-03-16 2001-03-27 Sumitomo Wiring Mold for producing resin-molded product
EP0733464A2 (en) * 1995-03-16 1996-09-25 SUMITOMO WIRING SYSTEMS, Ltd. Method of and mold for producing resin-molded product
DE19615309B4 (en) * 1996-04-18 2005-02-10 Friedrich Hachtel Method, injection-molded body and injection mold for producing an injection-molded body
DE19647968C1 (en) * 1996-11-20 1998-03-05 Battenfeld Extrusionstech Extruding hollow profiles of high cross=sectional accuracy
WO1998040195A1 (en) * 1997-03-13 1998-09-17 Filterwerk Mann+Hummel Gmbh Process for manufacturing hollow plastic objects
EP0867266A2 (en) * 1997-03-26 1998-09-30 Takata Corporation Resin bag and manufacturing method thereof
EP0867266A3 (en) * 1997-03-26 1999-06-09 Takata Corporation Resin bag and manufacturing method thereof
US6044629A (en) * 1997-03-26 2000-04-04 Takata Corporation Method of manufacturing resin bag
EP1044780A1 (en) * 1999-04-09 2000-10-18 Forsheda AB A method and an injection moulding machine for manufacturing products consisting of at least two product portions connected with each other
EP1484162A1 (en) * 2003-06-04 2004-12-08 Weener Plastik GmbH & Co. KG Method of manufacturing a plastic body and container
DE102005051230A1 (en) * 2005-10-26 2007-05-03 Exaflow Gmbh & Co. Kg Injection molding machine has at least two mold inserts separated by intermediate contour plates which are removed after injection, inserts then being fastened together

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