GB2203984A - Injection moulding composite articles - Google Patents
Injection moulding composite articles Download PDFInfo
- Publication number
- GB2203984A GB2203984A GB08809761A GB8809761A GB2203984A GB 2203984 A GB2203984 A GB 2203984A GB 08809761 A GB08809761 A GB 08809761A GB 8809761 A GB8809761 A GB 8809761A GB 2203984 A GB2203984 A GB 2203984A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resin
- cavity
- mold core
- injection molding
- cassette
- 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.)
- Granted
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
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1635—Making multilayered or multicoloured articles using displaceable mould parts, e.g. retractable partition between adjacent mould 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
- B29C45/16—Making multilayered or multicoloured articles
-
- 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
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
- B29K2995/0025—Opaque
-
- 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
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
- B29K2995/0026—Transparent
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Apparatus for injection moulding composite articles comprises a first cavity 9 into which a first resin 2a is injected, followed by lowering of a core 8 (as shown) to provide a second cavity 11 for the reception of a second injected resin 2b. A projection 13 in the first cavity 9 prevents the second resin 2b from deforming the resin interface I by causing the interface to bow into cavity 9. The projection 13 may have a triangular-shaped cross-section Fig. 8 (not shown). The moulded composite article may be a tape cassette. <IMAGE>
Description
APPARATUS FOR DOUBLE INJECTION MOLDING
The present invention relates generally to apparatus for double injection molding and more particularly to an apparatus for double injection molding opaque resin and transparent resin.
When different kinds of resins are integrally molded to form a product, the so-called double injection molding method is widely effected. According to this double injection molding method, a first resin is injected into a first cavity in a mold core and then a second resin is injected into a second cavity in the same mold core for. the first and second resins so as to be integrally molded.
As an example of a product which is molded of synthetic resin by the above-mentioned double injection molding, a tape cassette will be described hereinafter with reference to Figs. 1 to 4. This tape cassette is disclosed, for example, in Japanese laid-open utility model application
No. 60-60083 which has been filed by the assignee of the present invention.
Fig. 1 is a perspective view of the above-mentioned tape cassette. As Fig. 1 shows, a cassette housing 1 of the tape cassette comprises an upper cassette half 2 -and a lower cassette half 2, which are substantially the same in structure, molded of synthetic resin and are secured together by suitable conventional means such as screws. A pair of tape reels R1 and R2 are mounted rotatably in the cassette housing 1 and a magnetic tape 3 is wound on the reels R1 and R2 for transport therebetween.
A top wall 2a of each of the cassette halves 2 is molded of an opaque thermoplastic resin, for example, styrol resin. A transparent window 2b of substantially rectangular configuration is formed substantially centrally in the longitudinal direction of the top wall 2a of the cassette half 2 and extends over substantially the entire width in the transverse (side-to-side) direction of the top wall 2a.
The transparent window 2b is molded of transparent thermoplastic resin, for example, styrol resin and is formed integrally with the top wall 2a. Thus, the inside of the cassette housing 1 is visible through the transparent window 2b so that the amounts of the tape 3 wound on each of the reels R1 and R2 can be visually confirmed through the transparent window 2b.
When molding each of the cassette halves 2 having the opaque portion and the transparent portion by injection of the synthetic resin, there is employed a double injection mold core 5 shown in fragmentary, cross-sectional views in
Figs. 2A and 2B. As Figs. 2A and 2B show, the double injection mold core 5 comprises an upper stationary mold core 6, a lower stationary mold core 7 and a movable or slide mold core 8. Initially, the movable mold core 8 is in an advanced or elevated position as shown in Fig. 2A, wherein only a mold cavity 9 for molding the top wall 2a of the cassette half 2 is formed between the upper and lower mold cores 6 and 7.Then, a first resin, i.e., opaque resin is injected through an injection gate 10 formed in the upper stationary mold core 6 into the mold cavity 9 to mold the top wall 2a of the cassette half 2 (this process will be referred to as a primary molding process).
After the top wall 2a in the cassette half 2 is formed, the movable or slide mold core 8 is slid down within the lower stationary mold core 7 to a retracted position to thereby form a second cavity 11 for molding the transparent window 2b by the mold cores 6 and 8 as illustrated in Fig.
2B. A second resin, i.e., a transparent resin, is then injected through a second injection gate 12 into the second mold cavity 11 to thereby mold the transparent window 2b (this process will be referred to as a secondary molding process). The top wall 2a and the transparent window 2b of the cassette half 2 are molded integrally by means of heat and injection pressure during the secondary molding process.
In the conventional double injection molding process, however, the first resin is not solidified completely upon injection of the second resin so that the injection pressure a of the second resin pushes the first resin to be deformed. This defect will be described more fully with reference to Figs. 3 and 4. Fig. 3 is an enlarged, fragmentary cross-sectional view of a main portion of the conventional mold core, and Fig. 4 is a top view illustrating the inside of the cassette half 2. As Figs. 3 and 4 show, a desired interface I (shown in phantom) of the first and second resins, i.e., the desired interface I between the transparent window 2b and the top wall 2a is deformed by the pressure a as shown by a solid curve I' in
Figs. 3 and 4, thus the appearance of the tape cassette is degraded.
Accordingly, it is an object of the present invention to provide an improved apparatus for double injection molding.
It is another object of the present invention to provide an apparatus for double injection molding which can provide a tape cassette with excellent appearance.
It is a further object of the present invention to provide an apparatus for double injection molding which can improve work property in the molding process.
It is a further object of the present invention to provide an apparatus for double injection molding which can prevent a periphery of a window portion from being deformed in a tape cassette.
It is yet a further object of the present invention to provide an apparatus for double injection molding which can be applied to various kinds of products molded of synthetic resin.
According to an aspect of the present invention, there is provided an apparatus for double injection molding in which a first resin is injected into a first cavity formed by a mold core and a second resin is injected into a second cavity formed by a mold core for injection molding comprising alleviating means provided on said mold core and in said first cavity for molding said first resin at a position near said second cavity for molding said second resin for alleviating injecting stress of said second resin.
The above, and other objects, features and advantages of the present invention, will become apparent from the following detailed description of illustrative embodiments thereof to be read in conjunction with the accompanying drawings.
-Fig. 1 is a perspective view used to explain a tape cassette which is manufactured by the conventional double injection molding process;
Figs. 2A and 2B are cross-sectional views of a mold core used in conventional double injection molding, respectively;
Fig. 3 is an enlarged, fragmentary cross-sectional view of a main portion of the conventional mold core shown in Fig.s 2A and 3B;
Fig. 4 is a plan view showing the inside of the cassette half manufactured by the conventional double injection mold core; ;
Figs. 5A and 5B are cross-sectional views of an embodiment of a mold core used in an apparatus for double injection molding according to the present invention, in which Fig. 5A is used to explain the primary injection molding process, while Fig. 5B is used explain the secondary injection molding process;
Fig. 6 is an enlarged, fragmentary cross-sectional view of a main portion of the mold core shown in Fig. 5B;
Fig. 7 is a plan view illustrating the inside of the cassette half manufactured by the double injection molding apparatus of the present invention;
Fig. 8 is an enlarged, fragmentary cross-sectional view illustrating another example of the rib of the present invention; and
Figs. 9 and 10 are respectively plan views illustrating- further examples of the rib of the present invention.
The present invention will now be described with reference to Figs. 5A to 10. Throughout Figs. 5 to 10, like parts corresponding' to those of Figs. 1 to 4 are marked with the same reference numbers and therefore need not be described in detail. Also in this embodiment, the double injection molding apparatus of the invention is applied to the molding of the cassette half of the tape cassette, similarly to the afore-mentioned example of the prior art.
The mold core 5 used for the double injection molding of the present invention is summarized such that a mold core having in a mold cavity in which a first resin, i.e., a resin of first color is injected is provided with a deformation preventing means, for example, a rib of convex configuration at its position near a mold cavity in which a second resin, i.e., a resin of second color will be injected. To be more concrete, as Figs. SA and 5B show, a rib 13 which takes the form of convexity is formed on the lower stationary mold core 7 in the mold cavity 9 and at the position near the mold cavity 11. The rib 13 protrudes from the upper surface of the mold core 7 into the mold cavity 9 in height H, and the height H of the rib 13 is about one half of the thickness T of the mold cavity 9 as illustrated in Fig. 6.The rib 13 is rectangular in cross section and has predetermined length. A plurality of ribs 13, for example, eight ribs 13 are formed along the periphery of the transparent window 2b of the cassette half 2.
As Fig. 5A shows, the movable or slide mold core 8 is moved to its elevated position, wherein it blocks out or closes the cavity 11 in which the transparent window 2b will be molded. In this stated, an opaque resin as a resin of first color is injected through the injection gate 10 into the mold cavity 9 to mold the top wall 2a of the cassette half 2. Thereafter, as illustrated in Fig. 5B, the slide mold core 8 is retracted to form the mold cavity 11 in which the transparent window 2b will be molded. A transparent resin, i.e., resin of second color is injected through the second injection gate 12 into the mold cavity 11 to mold the transparent window 2b. At that time, as shown in Fig. 6, the injection stress a of the second resin is applied to the first resin which forms the top wall 2a of the cassette half 2.The injection stress a is, however, received by the rib 13 so that the desired interface I between the first and second resins can be prevented from being deformed substantially. Thus, the periphery of the transparent window 2b can be protected from being deformed and the thus made cassette half 2 is excellent in appearance.
After the cassette half 2 is molded as described above, the upper and lower stationary mold cores 6 and 7 are spaced apart to take out the cassette half 2 therefrom, whereby the finished product of the cassette half 2 having integrally the top wall 2a and transparent window 2b is obtained.
In the thus molded cassette half 2, concave portions 14 are formed on the inner surface of the top wall 2a corresponding to the ribs 13 as, for example, shown in
Fig. 7. Since the concave portions 14 are formed on the inner surface of the top wall 2a of the cassette half 2, these concave portions 14 do not bring about any trouble on the appearance of the tape cassette after its assembly has been finished. Also, the concave portions 14 never interfere with the magnetic tape incorporated within the tape cassette. Further, the concave portions 14 serve as the ribs to prevent the cassette half from being deformed.
According to the mold core 5 for the double injection molding of this embodiment as described above, since the lower stationary mold core 7 having therein the mold cavity 9 in which the top wall 2a of the cassette half 2 is molded is provided with the ribs 13 which receive the injection stress a of the second resin forming the transparent window 2b, the cassette half 2 can be prevented from being deformed. Thus, the dimension of the cassette half 2 can be determined with excellent accuracy and the cassette half can be improved from an industrial design standpoint. Further, since the injecting stress a of the second resin is treated without great care in the molding process, the molding conditions can be alleviated so that working properties in the molding process can be improved.
In addition, since the arrangement is very simple, the manufacturing cost for the mold core is substantially the same as in the prior art and the molding process can be effected with ease, thus various practical advantages being brought about.
While the rib 13 is selected to have a rectangular cross section in the above-mentioned embodiment shown in
Figs. 5A to 7, the rib 13 may be formed with a triangular cross section as shown in Fig. 8. In this case, the rib 13 has a vertical plane formed at the right-hand side to receive the injecting stress of the second resin, and the other side is formed as an inclined plane. In the second embodiment shown Fig. 8, the inclined plane of the rib 13 acts as a downward pitch, the cassette half 2 can be taken out of the mold core 5 with ease, after the completion of the injection molding process.
While the ribs 13 of predetermined length are formed at a plurality of places on the lower stationary mold core 7 as described in the embodiment shown in Figs. 5A to 7, the rib 13 may be formed continuously on mold cores 5 over the predetermined lengths thereof. Figs. 9 and 10 respectively illustrate examples of the cassette halves 2 molded by the above-mentioned mold cores 5. As Figs. 9 and 10 show, on the cassette halves 2, there are elongated concave portion 14 in association with the elongated ribs 13 by the mold cores 5.
Furthermore, instead of the convex ribs 13, it is possible to form deformation preventing means by forming, for example, convex-shaped portions in parallel at a predetermined pacing.
While the convex-shaped ribs or protrusions are provided as the deformation preventing means as described above, the deformation preventing means may be formed as concave-shaped portions. In this case, the first resin fills the convex-shaped portions and the portion molded by the first resin is engaged within the convex-shaped portions thereby to receive the injecting stress of the second resin.
Thus, the interface between the first and second resins can be prevented from being deformed. Therebefore, it is possible to obtain a molded product which has an excellent appearance.
While the double injection molding apparatus of the invention is applied to the molding of the cassette halves 2 of the tape cassette in the above-mentioned embodiments, the double injection molding apparatus of the invention is not limited to the application of the tape cassette but can be applied to the molding of various kinds of products molded of synthetic resin.
According to the double injection molding apparatus of the invention, as set forth above, since the mold core for forming the first mold cavity in which the first resin is molded is provided with the deformation preventing means in the first mold cavity at the position near the second mold cavity in which the second resin is molded, the injection stress of the second resin is received by the deformation preventing means. Thus, it is possible to prevent the interface between the first resin and the second resin in the molded product from being deformed by the stress. Therefore, the molded product is excellent in appearance and, hence, the present invention can be applied to the so-called double injection molding of the opaque resin and the transparent resin with great effect being achieved.
The above description is presented by way of example on the preferred embodiments of the invention and it will be apparent that many modifications and variations thereof could be effected by one with ordinary skill in the art without departing from the spirit and scope of the novel concepts of the invention. The scope of the invention is intended to be defined only by the appended claims.
Claims (6)
1. An apparatus for double injection molding, comprising: a mold core defining a first cavity and a second cavity so that a first resin is injectable into said first cavity and a second resin is injectable into said second cavity; and stress alleviating means provided on said mold core so as to protrude into said first cavity at a position near said second cavity for alleviating injection stress caused by the injection of said second resin.
2. The apparatus according to claim 1, wherein said alleviating means is a convex-shaped portion.
3. The apparatus according to claim 2, wherein said convex-shaped portion is formed of a plurality of elongated protrusions provided so as to extend in said first resin along an interface between said first and second resins.
4. The apparatus according to claim 2, wherein said convex-shaped portion has a rectangular cross section.
5. The apparatus according to claims 2, wherein said convex-shaped portion has a triangular cross section.
6. Apparatus for double injection molding constructed and arranged to operate substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62107348A JP2513227B2 (en) | 1987-04-30 | 1987-04-30 | Two-color molding die device |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8809761D0 GB8809761D0 (en) | 1988-06-02 |
| GB2203984A true GB2203984A (en) | 1988-11-02 |
| GB2203984B GB2203984B (en) | 1990-05-30 |
Family
ID=14456777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8809761A Expired - Lifetime GB2203984B (en) | 1987-04-30 | 1988-04-25 | Apparatus for double injection molding |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP2513227B2 (en) |
| KR (1) | KR880012332A (en) |
| FR (1) | FR2614574A1 (en) |
| GB (1) | GB2203984B (en) |
| IT (1) | IT1219561B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3939869A1 (en) * | 1988-12-02 | 1990-06-13 | Fuji Photo Film Co Ltd | INJECTION MOLD |
| US5071335A (en) * | 1989-09-26 | 1991-12-10 | Agfa Gevaert Aktiengesellschaft | Apparatus for two-layered injection moulding |
| GB2288362A (en) * | 1994-04-15 | 1995-10-18 | Nifco Inc | Speaker grilles and molding methods therefor |
| EP0897785A1 (en) * | 1997-08-20 | 1999-02-24 | Orga Kartensysteme GmbH | Method for producing a chip card, apparatus for carrying out the method and chip card |
| US7462314B2 (en) | 2004-02-24 | 2008-12-09 | Mold-Masters (2007) Limited | Multiple-material injection molding |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2815046B2 (en) * | 1987-06-19 | 1998-10-27 | ミノルタ株式会社 | Molded member and method of joining the same |
| JPH0726089Y2 (en) * | 1988-03-29 | 1995-06-14 | 三菱マテリアル株式会社 | Multicolor mold |
| DE19808145A1 (en) * | 1997-08-21 | 1999-02-25 | Structoform Spritzgiesen Aniso | Injection moulding of articles with two components |
| KR100419101B1 (en) * | 2001-02-15 | 2004-02-19 | 전성도 | Forming device for wallboard of vehicle |
| EP1559529A3 (en) * | 2004-02-02 | 2005-10-19 | The Procter & Gamble Company | Preforms made of two or more materials and processes for obtaining them |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB814337A (en) * | 1956-01-21 | 1959-06-03 | Roberto Pietrocola | A method for the manufacture of composite footwear soles and in particular of soles for shoes and sandals |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59133029A (en) * | 1983-01-19 | 1984-07-31 | Matsushita Electric Ind Co Ltd | Resin molding and manufacture thereof |
| JPS61108519A (en) * | 1984-11-02 | 1986-05-27 | Yoshida Kogyo Kk <Ykk> | Molding method of multi-color synthetic resin molded part, molding equipment and molded part thereof |
| JPH0657417B2 (en) * | 1985-11-15 | 1994-08-03 | ティーディーケイ株式会社 | Molding die |
| JP3241453B2 (en) * | 1992-09-25 | 2001-12-25 | 豊田工機株式会社 | Grinding method |
-
1987
- 1987-04-30 JP JP62107348A patent/JP2513227B2/en not_active Expired - Lifetime
-
1988
- 1988-04-25 GB GB8809761A patent/GB2203984B/en not_active Expired - Lifetime
- 1988-04-28 KR KR1019880004828A patent/KR880012332A/en not_active Application Discontinuation
- 1988-04-29 FR FR8805823A patent/FR2614574A1/en active Pending
- 1988-04-29 IT IT47897/88A patent/IT1219561B/en active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB814337A (en) * | 1956-01-21 | 1959-06-03 | Roberto Pietrocola | A method for the manufacture of composite footwear soles and in particular of soles for shoes and sandals |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3939869A1 (en) * | 1988-12-02 | 1990-06-13 | Fuji Photo Film Co Ltd | INJECTION MOLD |
| DE3939869C2 (en) * | 1988-12-02 | 2003-10-02 | Fuji Photo Film Co Ltd | injection mold |
| US5071335A (en) * | 1989-09-26 | 1991-12-10 | Agfa Gevaert Aktiengesellschaft | Apparatus for two-layered injection moulding |
| GB2288362A (en) * | 1994-04-15 | 1995-10-18 | Nifco Inc | Speaker grilles and molding methods therefor |
| US5623133A (en) * | 1994-04-15 | 1997-04-22 | Nifco, Inc. | Speaker grille and molding method therefor |
| GB2288362B (en) * | 1994-04-15 | 1997-11-12 | Nifco Inc | Speaker grilles and molding methods therefor |
| EP0897785A1 (en) * | 1997-08-20 | 1999-02-24 | Orga Kartensysteme GmbH | Method for producing a chip card, apparatus for carrying out the method and chip card |
| US7462314B2 (en) | 2004-02-24 | 2008-12-09 | Mold-Masters (2007) Limited | Multiple-material injection molding |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8809761D0 (en) | 1988-06-02 |
| JP2513227B2 (en) | 1996-07-03 |
| JPS63270113A (en) | 1988-11-08 |
| KR880012332A (en) | 1988-11-26 |
| FR2614574A1 (en) | 1988-11-04 |
| GB2203984B (en) | 1990-05-30 |
| IT8847897A0 (en) | 1988-04-29 |
| IT1219561B (en) | 1990-05-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19950425 |