JPH078517B2 - Molding method for thick molded products - Google Patents
Molding method for thick molded productsInfo
- Publication number
- JPH078517B2 JPH078517B2 JP60264463A JP26446385A JPH078517B2 JP H078517 B2 JPH078517 B2 JP H078517B2 JP 60264463 A JP60264463 A JP 60264463A JP 26446385 A JP26446385 A JP 26446385A JP H078517 B2 JPH078517 B2 JP H078517B2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- molding
- thick
- layer
- molded product
- 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.)
- Expired - Lifetime
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
Description
【発明の詳細な説明】 〔技術分野〕 この発明は、厚肉成形品の成形方法に関する。Description: TECHNICAL FIELD The present invention relates to a method for molding a thick-walled molded product.
樹脂による厚肉成形品、特に、プラスチックレンズやス
トラスビーズ調成形品等の透明厚肉成形品を射出成形で
得ようとする場合、最も問題となるのは、１回の成形に
要する時間が、通常の成形品に比べて、非常に長くなっ
てしまうことである。すなわち、このような厚肉成形品
では、射出成形後、樹脂がその内部まで完全に冷えるた
めには長時間を要し、それ以前に金型から前記成形品を
取り出すと、内部が冷える際に、ヒケや気泡が発生する
恐れがある。このようなヒケや気泡のない厚肉成形品を
得ようとする場合には、樹脂が完全に冷えるまで、金型
に長時間、圧力をかけておかなければならない。このた
め、１回の成形に要する時間（成形サイクル）は、前述
したように長時間となってしまうのである。When trying to obtain a resin-made thick-walled molded product, in particular, a transparent thick-walled molded product such as a plastic lens or a strass bead-like molded product by injection molding, the most problematic problem is that the time required for one molding is That is, it will be much longer than a normal molded product. That is, in such a thick-walled molded product, it takes a long time for the resin to completely cool to the inside after injection molding, and if the molded product is taken out from the mold before that, the inside will be cooled. , Sink marks and bubbles may occur. In order to obtain such a thick-walled molded product without sink marks and bubbles, pressure must be applied to the mold for a long time until the resin is completely cooled. Therefore, the time required for one molding (molding cycle) becomes long as described above.
そこで、１回の成形に要する時間を短縮するために、金
型を冷却したり、あるいは、金型温度を局部的に上げる
等のことが試みられているが、いずれも大きな効果を得
るまでには至っていない。Therefore, in order to shorten the time required for one molding, it has been attempted to cool the mold, or locally raise the mold temperature, but in any case, a large effect is obtained. Has not arrived.
〔発明の目的〕 この発明は、以上のことに鑑みて、成形サイクルを短く
することができる厚肉成形品の成形方法を提供すること
を目的とする。[Object of the Invention] In view of the above, an object of the present invention is to provide a method for molding a thick-walled molded product that can shorten the molding cycle.
この発明は、上記の目的を達成するために、厚肉成形品
を得るための成形空間に対する樹脂の注入を、同じ成形
型で、成形空間に進出させた成形型の一部を段階的に後
退させて、３段階以上に分けて積層するように行うとと
もに、第２段階以降の注入を第１段階で注入された樹脂
の両側で交互に行うことを特徴とする厚肉成形品の成形
方法を要旨としている。In order to achieve the above-mentioned object, the present invention is to inject resin into a molding space for obtaining a thick-walled molded product in the same molding die, and gradually retreat a part of the molding die advanced into the molding space. The method for forming a thick-walled molded article is characterized in that the injection is performed in three or more stages, and the injections in the second and subsequent steps are alternately performed on both sides of the resin injected in the first step. It is a summary.
以下に、この発明を、その実施に用いる装置の１例の一
部および工程をあらわす図面を参照しながら詳しく説明
する。Hereinafter, the present invention will be described in detail with reference to the drawings showing a part of an example of an apparatus used for carrying out the invention and steps.
第１図は、この発明の実施に用いる装置の１例の一部を
あらわしている。第１図にみるように、この発明の成形
方法を実施するのに用いる装置は、向かい合う１対の固
定型１と可動型２を有していて、可動型２の内側に押圧
用型３を有している。固定型１と可動型２の接合部は階
段状のパーティングライン４となっている。固定型１
は、２つのホットランナ5,6を備えている。ホットラン
ナ５は、押圧用型３に対向するゲート７を介して厚肉成
形品の成形空間（厚肉成形品を得るための成形空間）Ａ
に通じている。ホットランナ６は、固定型１と可動型２
との間にパーティングライン４に沿ったゲート８を介し
て厚肉成形品の成形空間Ａに通じている。ゲート７とゲ
ート８は、厚肉成形品の成形空間Ａの一方と他方とに配
置されている。FIG. 1 shows a part of an example of an apparatus used for carrying out the present invention. As shown in FIG. 1, the apparatus used for carrying out the molding method of the present invention has a pair of fixed mold 1 and movable mold 2 facing each other, and a pressing mold 3 is provided inside the movable mold 2. Have The joining portion between the fixed die 1 and the movable die 2 forms a stepped parting line 4. Fixed type 1
Has two hot runners 5,6. The hot runner 5 has a molding space A for molding a thick-walled molded product (a molding space for obtaining a thick-walled molded product) A through a gate 7 facing the pressing mold 3.
It leads to. The hot runner 6 includes a fixed mold 1 and a movable mold 2.
Through the gate 8 along the parting line 4 to the molding space A of the thick-walled molded product. The gate 7 and the gate 8 are arranged in one and the other of the molding spaces A of the thick-walled molded product.
第２図にみるように、まず、成形型の一部を構成する押
圧用型３を成形空間Ａに進出すなわち上昇させて、この
押圧用型３と固定型１および可動型２で構成される空間
に、ゲート７から樹脂を注入し、第１層９を形成する。
第１層９がある程度冷えた時点で、第３図にみるよう
に、押圧用型３を下げて成形空間Ａから少し後退させる
とともに、第１層９を押圧用型３と一緒に移動させ、第
１層９の上面と固定型１および可動型２で構成される空
間に、ゲート７から第１層９の片側に樹脂を注入し、第
２層10を形成する。第２層10がある程度冷えた時点で、
第４図にみるように、押圧用型３をさらに下げて、成形
空間Ａから完全に後退させるとともに、第１層９および
第２層10は固定型１側に残しておくようにして、押圧用
型３の上面に空間をあけ、この第２層10の下面と押圧用
型３の上面、固定型１および可動型２で構成される空間
に、ゲート８から第１層９の他方（第２層10のある方と
は反対側）に樹脂を注入し、第３層11を形成する。この
実施例では、厚肉成形品12は、第１層９、第２層10、お
よび、第３層11からなっている。したがって、厚肉成形
品の成形空間Ａは、厚肉成形品12全体の占めている部分
に相当する。なお、ここで、ある程度冷えた時点という
のは、たとえば、樹脂に加えている圧力を除いても、ヒ
ケおよび／または気泡が生じるおそれがなくなったとき
以降を指す。As shown in FIG. 2, first, the pressing die 3 forming a part of the forming die is advanced into the forming space A, that is, raised, and is composed of the pressing die 3, the fixed die 1 and the movable die 2. Resin is injected into the space from the gate 7 to form the first layer 9.
When the first layer 9 has cooled to some extent, as shown in FIG. 3, the pressing die 3 is lowered to retract slightly from the molding space A, and the first layer 9 is moved together with the pressing die 3, A resin is injected from the gate 7 to one side of the first layer 9 into a space formed by the upper surface of the first layer 9 and the fixed mold 1 and the movable mold 2 to form the second layer 10. When the second layer 10 has cooled to some extent,
As shown in FIG. 4, the pressing die 3 is further lowered so as to be completely retracted from the molding space A, and the first layer 9 and the second layer 10 are left on the fixed die 1 side, and the pressing die 3 is pressed. A space is opened on the upper surface of the working die 3, and the lower surface of the second layer 10, the upper surface of the pressing die 3, the fixed die 1 and the movable die 2 form a space between the gate 8 and the other of the first layer 9 (the first die 9). A resin is injected into the side opposite to the side having the second layer 10) to form the third layer 11. In this embodiment, the thick molded product 12 comprises a first layer 9, a second layer 10, and a third layer 11. Therefore, the molding space A of the thick-walled molded product corresponds to the portion occupied by the entire thick-walled molded product 12. Here, the time point when the temperature has cooled to a certain degree is, for example, after the time when there is no possibility of sink marks and / or bubbles even if the pressure applied to the resin is removed.
このように、厚肉成形品の成形空間に対する樹脂の注入
を２段階以上に分けて積層するように行って成形するこ
とにより、各層の成形自体は実質上薄肉成形となり、各
層の冷却が早くて、それぞれの中央部の温度降下を促進
することができる。なお、全体的にも中心部分を一番最
初に成形するようにすると、たとえば、第４図におい
て、第３層の材料を注入し終わった時点では、中心部分
（第１層）は周辺部分（第２層・第３層）よりも、温度
が低くなっている。したがって、厚物として樹脂材料を
全て注入し終わった時点から、成形品を型から外せるま
での時間を短くすることができるのである。In this way, by injecting the resin into the molding space of the thick-walled molded product in two or more stages so that the resin is laminated, the molding of each layer itself becomes substantially thin-walled, and the cooling of each layer is quick. , It is possible to promote the temperature drop of each central portion. If the central portion is formed first as a whole, for example, in FIG. 4, when the material for the third layer is completely injected, the central portion (first layer) becomes a peripheral portion ( The temperature is lower than that of the second and third layers. Therefore, it is possible to shorten the time from the completion of injecting all the resin material as a thick material to the time of removing the molded product from the mold.
この発明の成形方法は、層の分割を２以上で適当に設定
することによって、薄肉としての成形回数は増えるが、
トータルの成形時間を、厚肉成形品の成形空間に一気に
樹脂を注入する場合の成形時間よりも短くしようとする
ものである。In the molding method of the present invention, the number of moldings as a thin wall is increased by appropriately setting the number of layers to be divided into two or more.
It is intended to make the total molding time shorter than the molding time when resin is injected all at once into the molding space of a thick-walled molded product.
この実施例のように、厚肉成形品の成形空間に対する樹
脂の注入を３段階以上行うようにし、第２段階以降の注
入を第１段階で注入された樹脂の両側（上下，前後，左
右など反対方向）から交互に行うようにすると、温度的
にみて片側ばかりが高い状態にならなくなり、後で厚肉
成形品が反ってくるおそれがなくなり、厚肉成形品の品
質がより良くなる。As in this embodiment, the resin is injected into the molding space of the thick-walled molded product in three or more steps, and the injection of the second and subsequent steps is performed on both sides of the resin injected in the first step (up, down, front and back, left and right, etc.). If it is performed alternately from the opposite direction), only one side will not be in a high state in terms of temperature, the thick molded product will not warp later, and the quality of the thick molded product will be improved.
先に注入された樹脂で形成された薄肉層の両方から樹脂
の注入を行う場合には、両方同時に注入すると、先に形
成されている層（たとえば、第１層）が傾くことがある
ので、そのようなことが起きないようにするためには、
注入のバランスを慎重に保つ必要がある。上記の実施例
のように、交互に樹脂の注入を行うと、このようなこと
に気を配ることがなくてすみ、作業性が良くなる。When the resin is injected from both of the thin layers formed of the resin injected earlier, if both are injected at the same time, the layer formed earlier (for example, the first layer) may tilt, To prevent that from happening,
Care must be taken to balance the infusion. If the resin is alternately injected as in the above-mentioned embodiment, it is not necessary to pay attention to such a thing, and the workability is improved.
この発明の成形方法では、２段階以上ある樹脂の注入の
うち、少なくとも１つの段階で注入する樹脂が、他の段
階で注入する樹脂と異なっているようにすることも可能
である。たとえば、上記実施例において、第１層の樹脂
を、第２層および第３層の樹脂と異なるものにすること
により、サンドイッチ状に中央部に材質の異なるものを
入れ込むことができる。この場合に用いる装置の１例の
一部を第５図に示す。第５図に示したものは、第１図に
示したものにおいて、固定型１′がホットランナ５′、
押圧用型３に対向するゲート７′をも備えている以外は
同じであるので、同じものには同じ番号を付している。
この装置では、ゲート７は第２層となる樹脂を注入し、
ゲート８は第３層となる樹脂を注入する。ゲート７′は
第２層・第３層の樹脂と異なる第１層の樹脂を注入す
る。この場合、第２層の樹脂と第３層の樹脂とは同じで
もよく異なっていてもよい。第２層の樹脂と第３層の樹
脂のいずれか一方が第１層の樹脂と同じであるようにし
てもよい。In the molding method of the present invention, it is possible that the resin injected in at least one of the two or more resin injection steps is different from the resin injected in the other steps. For example, in the above embodiment, the resin of the first layer is made different from the resin of the second layer and the resin of the third layer, so that different materials can be put in the central portion in a sandwich shape. FIG. 5 shows a part of an example of the apparatus used in this case. The one shown in FIG. 5 is the same as that shown in FIG. 1 except that the fixed mold 1'is a hot runner 5 ',
Since they are the same except that the gate 7'opposed to the pressing mold 3 is also provided, the same parts are designated by the same reference numerals.
In this device, the gate 7 is filled with the resin to be the second layer,
The gate 8 is filled with a resin to be the third layer. The gate 7'injects a first layer resin different from the second and third layer resins. In this case, the resin of the second layer and the resin of the third layer may be the same or different. Either one of the resin of the second layer and the resin of the third layer may be the same as the resin of the first layer.
なお、この発明は、上記の実施例に限られない。積層の
順は、中央から外側への順、外側から中央への順、その
他種々ある。樹脂の注入するタイミングと型を後退させ
るタイミングとはいずれかを先にしたり、同時にしたり
するなど、特に限定しない。充填される樹脂は透明樹脂
でなくてもよい。The present invention is not limited to the above embodiment. There are various stacking orders, such as from the center to the outside, from the outside to the center, and so on. The timing of injecting the resin and the timing of retracting the mold are not particularly limited, and either the timing may be first or the timing may be the same. The filled resin does not have to be a transparent resin.
この発明の成形方法は、厚肉成形品の成形空間に進出し
ていた金型などの型を２以上の段階にわけて後退させ、
射出するなどして、樹脂の注入，充填を２以上の段階に
わけて行うことにより、薄肉成形品を形成し、これを積
層するようにして、厚肉成形品を得るものである。この
ため、成形品中央部の冷却時間を短縮することができ
る。これにより、成形サイクル全体の短縮化が図れる。
その際、成形サイクルに長時間かけていた場合に得られ
たのと同等の寸法精度，ウェルド防止効果，気泡防止効
果，ヒケ防止効果がある。すなわち、成形サイクルを短
縮しても得られる厚肉成形品の品質劣化がない。このた
め作業効率が向上し、成形コストの低減が図れる。この
発明の成形方法によれば、非常に厚みの厚いものも得ら
れ、この場合にも短い時間で成形できる。According to the molding method of the present invention, a mold such as a mold that has advanced into the molding space of a thick-walled molded product is retracted in two or more stages,
By injecting and filling the resin in two or more stages by injection or the like, a thin-walled molded product is formed and laminated to obtain a thick-walled molded product. Therefore, the cooling time of the central part of the molded product can be shortened. As a result, the entire molding cycle can be shortened.
At that time, the dimensional accuracy, the weld prevention effect, the bubble prevention effect, and the sink mark prevention effect are the same as those obtained when the molding cycle takes a long time. That is, even if the molding cycle is shortened, the quality of the thick molded product obtained does not deteriorate. Therefore, the working efficiency is improved and the molding cost can be reduced. According to the molding method of the present invention, a very thick product can be obtained, and also in this case, molding can be performed in a short time.
この発明の厚肉成形品の成形方法は、前記のように構成
されているので、成形品の中央部分の冷却時間を短縮す
ることができ、トータルとしても成形サイクルを短くす
ることができる。Since the method for molding a thick-walled molded product of the present invention is configured as described above, the cooling time of the central portion of the molded product can be shortened, and the molding cycle as a whole can be shortened.
特に、樹脂の注入を３段階以上に分けるとともに、第２
段階以降の注入を第１段階で注入された樹脂の両側で交
互に行うので、各段階において、それまでに成形された
樹脂を、成形型の一方の型面に合わせて正確に位置決め
した状態で、新たな樹脂を注入することになり、各段階
における樹脂の厚みを正確に設定できて、精度の高い成
形が可能になる。Especially, the resin injection is divided into three or more stages, and the second
Since the injections after the steps are performed alternately on both sides of the resin injected in the first step, in each step, the resin that has been molded up to that point must be positioned accurately according to one mold surface of the mold. Since new resin is injected, the thickness of the resin at each stage can be accurately set, and highly accurate molding can be performed.
第１図はこの発明の成形方法を実施するのに用いる装置
の１例の一部をあらわす断面図、第２図〜第４図はこの
発明の主な工程を説明する断面図、第５図はこの発明の
成形方法を実施するのに用いる装置の別の例の一部をあ
らわす断面図である。 ９…第１層、10…第２層、11…第３層、12…厚肉成形
品、Ａ…厚肉成形品の成形空間FIG. 1 is a sectional view showing a part of an example of an apparatus used for carrying out the molding method of the present invention, FIGS. 2 to 4 are sectional views for explaining the main steps of the present invention, and FIG. FIG. 6 is a sectional view showing a part of another example of the apparatus used for carrying out the molding method of the present invention. 9 ... 1st layer, 10 ... 2nd layer, 11 ... 3rd layer, 12 ... Thick wall molded product, A ... Molding space of thick wall molded product
───────────────────────────────────────────────────── フロントページの続き (72)発明者 大塚 忠弘 大阪府門真市大字門真1048番地 松下電工 株式会社内 (72)発明者 中尾 養太郎 大阪府豊中市豊南町東４丁目１番14号 新 潮プラスチツク照明株式会社内 (56)参考文献 特開 昭60−97301（ＪＰ，Ａ) 特開 昭59−73930（ＪＰ，Ａ) 特開 昭52−21064（ＪＰ，Ａ) 特開 昭52−10357（ＪＰ，Ａ) 特開 昭52−146476（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Tadahiro Otsuka 1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works, Ltd. (72) Yotaro Nakao 4-1-1, Shinoncho, Toyonan-cho, Toyonaka-shi, Osaka Shincho Plastic Stick Lighting Co., Ltd. (56) Reference JP-A-60-97301 (JP, A) JP-A-59-73930 (JP, A) JP-A-52-21064 (JP, A) JP-A-52-10357 (JP , A) JP-A-52-146476 (JP, A)
Claims (1)
得るための成形空間に対する樹脂の注入を、同じ成形型
で、成形空間に進出させた成形型の一部を段階的に後退
させて、３段階以上に分けて積層するように行うととも
に、第２段階以降の注入を第１段階で注入された樹脂の
両側で交互に行うことを特徴とする厚肉成形品の成形方
法。1. When obtaining a thick-walled molded product, a resin is injected into a molding space for obtaining the thick-walled molded product in the same molding die, and a part of the molding die advanced into the molding space is retreated stepwise. The method for forming a thick-walled molded article is characterized in that the resin is injected in three or more stages so as to be laminated, and the injections in the second and subsequent steps are alternately performed on both sides of the resin injected in the first step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60264463A JPH078517B2 (en) | 1985-11-25 | 1985-11-25 | Molding method for thick molded products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60264463A JPH078517B2 (en) | 1985-11-25 | 1985-11-25 | Molding method for thick molded products |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62122726A JPS62122726A (en) | 1987-06-04 |
| JPH078517B2 true JPH078517B2 (en) | 1995-02-01 |
Family
ID=17403562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60264463A Expired - Lifetime JPH078517B2 (en) | 1985-11-25 | 1985-11-25 | Molding method for thick molded products |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH078517B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE165552T1 (en) * | 1988-06-02 | 1998-05-15 | Jens Ole Sorensen | REDUCING THE REQUIRED MOLD CLOSING FORCE AND CONTROLLING THE WALL THICKNESS OF AN INJECTION MOLDED PART |
| US4966545A (en) * | 1989-04-19 | 1990-10-30 | Husky Injection Molding Systems Ltd. | Staged shooting pot for injection molding |
| US7462314B2 (en) | 2004-02-24 | 2008-12-09 | Mold-Masters (2007) Limited | Multiple-material injection molding |
| JP5731359B2 (en) * | 2011-11-18 | 2015-06-10 | 南部化成株式会社 | Multilayer molded article and optical lens |
| JP6520494B2 (en) * | 2015-07-08 | 2019-05-29 | 三菱電機株式会社 | Method of forming thick resin molded article and method of manufacturing thick resin molded article |
| CN108290329B (en) * | 2015-12-30 | 2019-07-12 | 沙特基础工业全球技术有限公司 | The method of injection-molded product |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5913335B2 (en) * | 1975-07-15 | 1984-03-29 | オムロン株式会社 | Progressive molding method for resin molded products |
| JPS5221064A (en) * | 1975-08-09 | 1977-02-17 | Mitsubishi Petrochemical Co | Method and device for injection molding crystalline thermoplastic synthetic resin product |
| JPS5973930A (en) * | 1982-10-22 | 1984-04-26 | Mitsubishi Rayon Co Ltd | Manufacture of synthetic resin molded shape |
| JPS6097301A (en) * | 1983-10-31 | 1985-05-31 | Konishiroku Photo Ind Co Ltd | Resin optical element and method for producing said element |
-
1985
- 1985-11-25 JP JP60264463A patent/JPH078517B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62122726A (en) | 1987-06-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH07100886A (en) | Thin wall molding method | |
| US5045268A (en) | Cross-lamination injection molding | |
| JPH078517B2 (en) | Molding method for thick molded products | |
| JPH0684031B2 (en) | Injection molding method | |
| JPS6097301A (en) | Resin optical element and method for producing said element | |
| EP0371773A2 (en) | Windows for automobiles or the like, and method of manufacturing the same | |
| JPH0331124B2 (en) | ||
| JPS59165632A (en) | Method and apparatus for injecting and molding hollow article | |
| JP3299428B2 (en) | Injection molded article molding method and molding die | |
| JPH10272656A (en) | Molding method of hollow article and device therefor | |
| JP3236597B2 (en) | Method for manufacturing card base material for IC card and manufacturing die | |
| KR102015008B1 (en) | Exterior Cover for Digital Doorlock by Dual Injection and Molding Method Thereof | |
| JP3350581B2 (en) | In-mold vibration processing method and apparatus | |
| JP2020055196A (en) | Molding method and molding die for resin lens having flange around | |
| JP2002355851A (en) | Method for injecting molding composite molded product and injection molding die | |
| JP2859494B2 (en) | Multi-material injection molding machine | |
| JPH081714A (en) | Injection molding method of laminate | |
| JPH06143333A (en) | Manufacture of resin molded article and mold assembly | |
| CN213733142U (en) | Back shell inverted mould of tablet personal computer | |
| JPS62101410A (en) | Compression molding of multi-layer resin part | |
| JPH0976291A (en) | Molding method of molded form consisting of different material and molding die therefor | |
| JP3580560B2 (en) | Elastic compression molding method and elastic compression mold | |
| JP3042827B2 (en) | Multiple injection molding method and multiple injection molding mold | |
| JP2002187177A (en) | Method for manufacturing injection compression molded article | |
| JP3974544B2 (en) | Mold equipment |