DE2230404A1 - METHOD FOR PRODUCING SMOOTH PLASTIC MOLDED PARTS BY INJECTION MOLDING, MOLDING TOOLS SUITABLE FOR PERFORMING THE PROCESS AND MOLDED PART PRODUCED BY THE METHOD - Google Patents
METHOD FOR PRODUCING SMOOTH PLASTIC MOLDED PARTS BY INJECTION MOLDING, MOLDING TOOLS SUITABLE FOR PERFORMING THE PROCESS AND MOLDED PART PRODUCED BY THE METHODInfo
- Publication number
- DE2230404A1 DE2230404A1 DE19722230404 DE2230404A DE2230404A1 DE 2230404 A1 DE2230404 A1 DE 2230404A1 DE 19722230404 DE19722230404 DE 19722230404 DE 2230404 A DE2230404 A DE 2230404A DE 2230404 A1 DE2230404 A1 DE 2230404A1
- Authority
- DE
- Germany
- Prior art keywords
- injection molding
- molding
- molded parts
- part produced
- mold
- 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
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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings
-
- 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
- B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
- B29C33/60—Releasing, lubricating or separating agents
- B29C33/62—Releasing, lubricating or separating agents based on polymers or oligomers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Molding Of Porous Articles (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
Robert Harming, Campione 22304Q4Robert Harming, Campione 22304Q4
Verfahren zur Herstellung von glatten Kunststofformteilen durch. Spritzgießen, zur Durchführung des Verfahrens geeignetes Formwerkzeug und nach dem Verfahren hergestelltes NormteilProcess for the production of smooth plastic molded parts by. Injection molding, mold suitable for carrying out the process and after the process manufactured standard part
Bei den üblichen Spritzgießverfahren wird vor dem eigentlichen Spritzvorgang in das Formwerkzeug ein Trennmittel eingegeben, welches verhindern soll, daß der Kunststoff an der Form haftet. Es läßt sich jedoch nicht vermeiden, daß das Trennmittel sich mit dem Kunststoff vermischt und die Oberfläche des Formteiles beeinträchtigt. Dies ist insbesondere bei treibmittelhaltigen Kunststoffen der Fall, da das Trennmittel in die Poren eindringen und die anschließende Oberflächenbehandlung, beispielsweise eine Lackierung, verhindern oder mindestens insofern erschweren kann, als diese nur nach einer mechanischen Nacharbeit möglich ist. Der Aufwand an Zeit und Personal für die mechanische Nacharbeit beträgt meistens ein Vielfaches des Aufwandes für das eigentliche Spritzgießen.In conventional injection molding processes, a release agent is added to the mold before the actual injection process, which is to prevent the plastic from sticking to the mold. However, the release agent cannot be avoided mixed with the plastic and impaired the surface of the molded part. This is particularly the case with propellant-containing Plastics are the case, as the release agent penetrates the pores and the subsequent surface treatment, for example painting, can prevent or at least make it more difficult insofar as this is only possible after mechanical reworking is. The expenditure of time and personnel for the mechanical rework is usually a multiple of the expenditure for the actual injection molding.
Der Erfindung liegt die Aufgabe zugrunde, diese Nachteile zu vermeiden, das heißt, ein Verfahren zu schaffen, nach welchem glatte Formteile hergestellt werden können, die ohne eine mechanische Nacharbeit einer Nachbehandlung, beispielsweise einer Lackierung, unterzogen werden können.The invention is based on the object of avoiding these disadvantages, that is, of creating a method according to which Smooth moldings can be made without a mechanical Rework can be subjected to post-treatment, for example painting.
Bei der Lösung dieser Aufgabe ist von der Erkenntnis ausgegangen woroen, daß es Kunststoffe gibt, welche einerseits sehr hitze-The solution to this problem was based on the knowledge that there are plastics which, on the one hand, are very heat-
209885/0822209885/0822
beständig und andererseits wenig adhäsiv sind, beispielsweise Betrafluorkohlenstoff. Es wurde gefunden, daß die gewünschte Überfläche eines Kunststoff-Spritzgußteiles erhalten werden kann,wenn man die Innenwände der Form und der etwaigen Zufüiiiungoleitungen mit einem derartigen Kunststoff beschichtet.stable and, on the other hand, not very adhesive, for example betrafluorocarbon. It has been found that the desired surface area of an injection molded plastic part can be obtained if the inner walls of the mold and any supply lines coated with such a plastic.
Das erfindungsgemäße-Verfahren ist somit dadurch gekennzeichnet, daß die plastizierte Mass e ohne Verwendung von Trennmitteln in ein Formwerkzeug eingespritzt wird, bei welchem die Innenwände der Form und der Zuleitungen mit Tetrafluorkohlenstoff od.. dgl. beschichtet sind.The method according to the invention is thus characterized in that the plasticized mass e is injected into a mold without the use of release agents, in which the inner walls the shape and the supply lines with carbon tetrafluoride or the like are coated.
Das erfindung-sgemäße Formwerkzeug zur Durchführung des Verfahrens ist demgemäß dadurch gekennzeichnet, daß die Innenwände der Form mit Tetrafluorkohlenstoff od. dgl. ausgekleidet sind.The molding tool according to the invention for carrying out the method is accordingly characterized in that the inner walls of the mold are lined with tetrafluorocarbon or the like.
Ein Ausführungsbeispiel ist in der Zeichnung dargestellt. Die beiden Formhälften 1 und 2 weisen auf ihren Innenflächen die Beschichtungen 10 und 20 auf. Letztere sir.d der Deutlichkeit halber in verzerrtem Maßstab dargestellt.An exemplary embodiment is shown in the drawing. The two Mold halves 1 and 2 have coatings 10 and 20 on their inner surfaces. The latter sir.d for the sake of clarity shown on a distorted scale.
Derartig ausgekleidete Formwerkzeuge bewirken wegen des geringen Reibungswertes des Auskleidungsmaterials, daß der Strömungswiderstand beim Einspritzen des Kunststoffes wesentlich verringert wird, Infolgedessen ist es möglich, unter optimalen Bedingungen treibmittelhaltigen Kunststoff "einzuspritzen, nämlich mit hoher Spritzgeschwindigkeit und hohem Druck, wodurch eine Entgarsimg innerhalb der Form weitgehend vermieden wird.Mold tools lined in this way have the effect of reducing the flow resistance due to the low coefficient of friction of the lining material when injecting the plastic is significantly reduced, as a result, it is possible, under optimal conditions, to contain propellant To inject plastic ", namely at high injection speed and high pressure, creating a degarsimg within the shape is largely avoided.
Die nach dem erfindungsgemäßen Verfahren hergesteil ton Formteile zeichnen sich durch eine außergewöhnlich saubere und gLatte Oberfläche'aus, die keinerlei mechanischer Nacharbeit bedarf, um eine haltbare Lackierung zu ermöglichen.The molded parts produced by the method according to the invention are characterized by an exceptionally clean and smooth surface, which does not require any mechanical rework to enable a durable paintwork.
209885/08 2 2209885/08 2 2
Claims (2)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH1071271A CH533003A (en) | 1971-07-21 | 1971-07-21 | Process for the production of smooth plastic molded parts by injection molding, a mold suitable for carrying out the process and a molded part produced by the process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE2230404A1 true DE2230404A1 (en) | 1973-02-01 |
Family
ID=4366022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19722230404 Pending DE2230404A1 (en) | 1971-07-21 | 1972-06-22 | METHOD FOR PRODUCING SMOOTH PLASTIC MOLDED PARTS BY INJECTION MOLDING, MOLDING TOOLS SUITABLE FOR PERFORMING THE PROCESS AND MOLDED PART PRODUCED BY THE METHOD |
Country Status (4)
| Country | Link |
|---|---|
| CH (1) | CH533003A (en) |
| DE (1) | DE2230404A1 (en) |
| FR (1) | FR2146263A1 (en) |
| IT (1) | IT962841B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4517247A (en) * | 1982-05-21 | 1985-05-14 | Junkosha Co., Ltd. | Fluororesin formed body and method for producing the same |
| DE19908936A1 (en) * | 1999-03-02 | 2000-09-07 | Feinwerktechnik Wetzlar Gmbh | Injection molding device and method for producing precision optical and precision mechanical parts from a thermoplastic |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3382281B2 (en) * | 1993-01-22 | 2003-03-04 | 株式会社太洋工作所 | Mold for thermoplastic resin injection molding |
-
1971
- 1971-07-21 CH CH1071271A patent/CH533003A/en not_active IP Right Cessation
-
1972
- 1972-06-22 DE DE19722230404 patent/DE2230404A1/en active Pending
- 1972-07-12 FR FR7225303A patent/FR2146263A1/en not_active Withdrawn
- 1972-07-14 IT IT2698372A patent/IT962841B/en active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4517247A (en) * | 1982-05-21 | 1985-05-14 | Junkosha Co., Ltd. | Fluororesin formed body and method for producing the same |
| DE19908936A1 (en) * | 1999-03-02 | 2000-09-07 | Feinwerktechnik Wetzlar Gmbh | Injection molding device and method for producing precision optical and precision mechanical parts from a thermoplastic |
| DE19908936C2 (en) * | 1999-03-02 | 2002-10-31 | Feinwerktechnik Wetzlar Gmbh | Injection molding device and method for producing precision optical and precision mechanical parts from a thermoplastic |
Also Published As
| Publication number | Publication date |
|---|---|
| CH533003A (en) | 1973-01-31 |
| IT962841B (en) | 1973-12-31 |
| FR2146263A1 (en) | 1973-03-02 |
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