JPS6142617B2 - - Google Patents
Info
- Publication number
- JPS6142617B2 JPS6142617B2 JP5053979A JP5053979A JPS6142617B2 JP S6142617 B2 JPS6142617 B2 JP S6142617B2 JP 5053979 A JP5053979 A JP 5053979A JP 5053979 A JP5053979 A JP 5053979A JP S6142617 B2 JPS6142617 B2 JP S6142617B2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- gate
- mold
- cavity
- core material
- 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
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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
-
- 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
- B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
- B29C43/361—Moulds for making articles of definite length, i.e. discrete articles with pressing members independently movable of the parts for opening or closing the mould, e.g. movable pistons
- B29C2043/3615—Forming elements, e.g. mandrels or rams or stampers or pistons or plungers or punching devices
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
- B29C43/361—Moulds for making articles of definite length, i.e. discrete articles with pressing members independently movable of the parts for opening or closing the mould, e.g. movable pistons
- B29C2043/3615—Forming elements, e.g. mandrels or rams or stampers or pistons or plungers or punching devices
- B29C2043/3621—Forming elements, e.g. mandrels or rams or stampers or pistons or plungers or punching devices a plurality of individual elements acting on the material in the same or diferent directions, e.g. making tubular T-joints, profiles
- B29C2043/3623—Forming elements, e.g. mandrels or rams or stampers or pistons or plungers or punching devices a plurality of individual elements acting on the material in the same or diferent directions, e.g. making tubular T-joints, profiles coupled on a support, e.g. plate
-
- 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
- B29C45/1657—Making multilayered or multicoloured articles using means for adhering or bonding the layers or parts to each other
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)
Description
【発明の詳細な説明】
本発明は、射出成形方法又はそれに関する改良
に係わる。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an injection molding method or improvements thereto.
１つの金型に２つ以上の材料を射出して、積層
物品を製造する方法は、周知の事であり、種々の
方法が提案されて来た。所で、それらの多くは、
射出圧力よりも、より大きな力で型締されたキヤ
ビテイの中に、順次、又は同時に２つ以上の樹脂
を射出して、積層するものでこの後、発泡させる
為に型開きする以外は、固定したほとんど変化し
ないキヤビテイへの射出である。これらは、ゲー
ト口の反対側の面に近い所の各樹脂層の間の接着
強度は特に弱く、多少ともフレキシブルな性質を
持つた薄肉製品の場合、層間ではがれる問題が生
じる。 2. Description of the Related Art Methods for producing laminated articles by injecting two or more materials into one mold are well known, and various methods have been proposed. By the way, many of them are
Two or more resins are injected sequentially or simultaneously into a mold cavity that is clamped with a force greater than the injection pressure, and are then laminated. This is the injection into the cavity where there is almost no change. The adhesion strength between the resin layers near the surface opposite to the gate opening is particularly weak, and in the case of thin-walled products that are more or less flexible, there is a problem of peeling between the layers.
この問題に対し、特開昭46−1542では、接着性
を改良する化合物を射出して、第１の樹脂と次の
樹脂との接着力を増す事が提案されている。しか
し、この方法は、接着改良剤を均一に射出する事
がむずかしかつたり、食品に接するものに使えな
い場合もあつたりして、選定がむずかしく、又、
接着力が向上しにくかつたりする問題があり、汎
用性がない。 To address this problem, Japanese Patent Laid-Open No. 46-1542 proposes to increase the adhesion between the first resin and the next resin by injecting a compound that improves adhesion. However, with this method, it is difficult to uniformly inject the adhesion improver, and in some cases it cannot be used on items that come into contact with food, making selection difficult.
There is a problem that it is difficult to improve the adhesive strength and it tends to slip, so it is not versatile.
また、特開昭51−24662のように、キヤビテイ
を満たすに足りない量だけ射出して積層した後、
金型を移動させて圧搾する方法によつても、層間
の強度を増す事はできる。しかしながら、このよ
うな方法は垂直フラツシユ形式のモールド（即
ち、モールドキヤビテイは、互いに相対的に滑動
するモールド部材によつて、モールドキヤビテイ
が包囲され、容積が変動する）を使用し、かつ、
ゲート方向が滑動と同じ方向であつて、かつ、ゲ
ートがセンターゲートのような場合でないと良好
な効果は現われない。又、この方法では、内核材
の射出速度が早すぎる場合や、スキン樹脂が溶融
状態における伸びのない場合には、内核材が表面
に出やすく、逆に内核材の射出速度が遅すぎる場
合、ゲートから離れた場合へも均一に内核材が射
出されず、スキン樹脂のみの層が多く発生する。
その他、常に同じ肉厚、同じ重量の製品ができに
くく、製品によるバラツキが非常に大きい。従つ
て、ひけがゲートから離れた周縁部で特に発生し
やすい問題を含んでいる。 Also, as in JP-A-51-24662, after injecting and laminating the amount insufficient to fill the cavity,
The strength between the layers can also be increased by moving the mold to compress the material. However, such methods use vertical flash type molds (i.e., the mold cavity is surrounded by mold members that slide relative to each other, varying in volume), and
A good effect will not be obtained unless the gate direction is the same as the sliding direction and the gate is a center gate. In addition, in this method, if the injection speed of the inner core material is too fast or if the skin resin does not elongate in the molten state, the inner core material tends to come out to the surface, and conversely, if the injection speed of the inner core material is too slow, Even when the inner core material is away from the gate, the inner core material is not uniformly injected, and many layers of only skin resin are generated.
In addition, it is difficult to produce products with the same wall thickness and weight, and there is considerable variation between products. Therefore, there is a problem in that sink marks are particularly likely to occur at the peripheral portion away from the gate.
本発明は、これらの欠点をなくして、ゲート周
辺部の接着強度を増す方法を与えるものである。
第１図に本発明による金型の例を示した。この図
のように、本発明に係る金型においては、ゲート
３口の反対側の面の一部を移動金型（雄型）全体
に対して独立して可動できるものとし、ゲート周
辺の肉厚を変化できるものとする。この可動面の
広さは、全表面積の0.5〜30％が良く、肉厚が薄
い（２mm以下）場合７〜30％好ましくは、３〜15
％、又肉厚が厚い（５mm以上）場合0.5〜10％好
ましくは、１〜７％が良好である。又、可動する
体積は、全キヤビテイ容量の１％以上、好ましく
は、５〜20％とする。以上のような可動部付金型
を使用しての本発明方法を示す。 The present invention provides a method for eliminating these drawbacks and increasing the adhesive strength around the gate.
FIG. 1 shows an example of a mold according to the present invention. As shown in this figure, in the mold according to the present invention, a part of the surface opposite to the three gates can be moved independently with respect to the entire movable mold (male mold), and the The thickness can be changed. The width of this movable surface is preferably 0.5 to 30% of the total surface area, preferably 7 to 30% if the wall thickness is thin (2 mm or less), and preferably 3 to 15%.
%, or preferably 0.5 to 10% if the wall thickness is thick (5 mm or more), and preferably 1 to 7%. Further, the movable volume is 1% or more of the total cavity capacity, preferably 5 to 20%. The method of the present invention using the mold with a movable part as described above will be described.
この方法は、同時射出成形でも可能ではある
が、初めの射出には、スキン樹脂のみを射出する
事が好ましい。なお、本発明においてスキン樹脂
とは成型品の表面を構成する樹脂である。また、
内核材とはそれ以外の樹脂をいい、単層の樹脂、
積層した複数の樹脂等である。 Although this method can be carried out by simultaneous injection molding, it is preferable to inject only the skin resin in the first injection. Note that in the present invention, the skin resin is a resin that constitutes the surface of a molded product. Also,
Inner core material refers to other resins, including single layer resin,
It is a plurality of laminated resins, etc.
初めの射出にスキン樹脂のみを射出することに
よりスキン樹脂が射出され、ゲート近傍のキヤビ
テイ内壁に、スキン樹脂の固化層が形成される。
ここで、スキン樹脂のキヤビテイに接していない
部分（すなわちスキン樹脂の中心部分）が流動状
態であつて固化する前に内核材（樹脂又は積層し
た樹脂）を流動状態で最初のスキン樹脂中に射出
する。内核材の射出は１回又は複数回繰り返して
行なうことができ、スキン樹脂と内核材を合わせ
た全樹脂は最終的なキヤビテイの体積と等しいも
のとする。 By injecting only the skin resin in the first injection, the skin resin is injected, and a solidified layer of the skin resin is formed on the inner wall of the cavity near the gate.
Here, the inner core material (resin or laminated resin) is injected into the first skin resin in a fluid state before the part of the skin resin that is not in contact with the cavity (i.e., the center part of the skin resin) solidifies. do. The injection of the inner core material can be repeated once or multiple times, and the total resin including the skin resin and the inner core material is equal to the final cavity volume.
この樹脂を射出開始した時点から射出完了する
までの間にも、可動部を動かす事はかまわない。
（但し、樹脂とキヤビテイとの接し始める線ｌ即
ち樹脂の先端が常に動いているような状態が好ま
しい）。全樹脂を規定量射出完了直前から、又は
完了直後に可動部を動かして、射出完了後まで、
充分に可動部での加圧を行ない、ゲート周辺の肉
厚を減少させる。 The movable part may be moved from the time when injection of the resin is started until the injection is completed.
(However, it is preferable that the line 1 where the resin and the cavity begin to make contact, that is, the tip of the resin, is constantly moving). The movable part is moved immediately before or after injection of the specified amount of all resin is completed, until after injection is completed.
Apply sufficient pressure to the movable parts to reduce the wall thickness around the gate.
これによつて、樹脂は、キヤビテイの周縁部ま
で均一な層となつて射出されると共に、ゲート反
対側のスキン樹脂層が薄くならず、これまでのサ
ンドイツチ射出成形方法のように内核材の偏肉が
大きいような事も改良された。従つて、ゲート反
対側のスキン樹脂層の内核材との接合面における
温度が低下しないで内核材と接する事により、著
しく接着強度が向上する。なお、可動部は、ゲー
ト面に垂直な動きでなくても良いが、ゲート近傍
の肉厚が変化するような方向でなくてはならな
い。従つて、サイドゲートの場合、第３図のよう
に可動部をとつても、本発明の方法と一致し、同
様の効果を生む。（但し、ゲート近傍のキヤビテ
イ面に垂直な動き程、加圧力が大きくかけやすい
ので、垂直に近い程良い。）
本発明に用いる事のできるプラスチツク材料
は、粘稠な液体状態にある間にモールドキヤビテ
イに射出できるものであり、かつ、その後、モー
ルドキヤビテイに射出できるものであり、かつ、
その後、金型内で固化の起こす事のできるもので
ある。又、内核材とスキン樹脂は、接着性のある
もの同士が好ましいが、そうでない場合は、中核
材に、内核材とスキン樹脂の両方に接着できる樹
脂を使用し、これをスキン樹脂と内核材の間に射
出する。たとえば内核材に６−ナイロン樹脂、ス
キン樹脂に無水マレイン酸グラフト重合したポリ
エチレンの組合せ、内核材に塩化ビニリデン樹
脂、中核材にエチレン−酢酸ビニル共重合体樹
脂、スキン樹脂には、ポリエチレンの組合せなど
である。 As a result, the resin is injected in a uniform layer all the way to the periphery of the cavity, and the skin resin layer on the opposite side of the gate is not thinned, resulting in uneven distribution of the inner core material as in the conventional sandwich injection molding method. Things like bigger meat have also been improved. Therefore, the bonding strength of the skin resin layer on the opposite side of the gate is significantly improved by contacting the inner core material without lowering the temperature at the bonding surface with the inner core material. Note that the movable part does not need to move perpendicular to the gate surface, but must move in a direction that changes the wall thickness near the gate. Therefore, in the case of the side gate, even if a movable part is provided as shown in FIG. 3, the method corresponds to the method of the present invention and produces the same effect. (However, the closer the movement is perpendicular to the cavity surface near the gate, the easier it is to apply a large pressure force, so the closer it is to the vertical, the better.) The plastic material that can be used in the present invention is molded while it is in a viscous liquid state. can be injected into the cavity, and can then be injected into the mold cavity, and
After that, it can be solidified in the mold. In addition, it is preferable that the inner core material and the skin resin have adhesive properties, but if they are not, use a resin that can adhere to both the inner core material and the skin resin for the core material, and use this resin to bond the skin resin and the inner core material. eject between. For example, a combination of 6-nylon resin for the inner core material, polyethylene grafted with maleic anhydride for the skin resin, vinylidene chloride resin for the inner core material, ethylene-vinyl acetate copolymer resin for the core material, and polyethylene for the skin resin. It is.
実施例
第１図のような、肉厚が２mm厚の均一なキヤビ
テイにおいて、内核材として、６−ナイロン樹脂
（融点224℃、比重1.14）、スキン樹脂を無水マレ
イン酸グラフト変性ポリプロピレン（MI＝７、
比重0.91、ポリエチレン１ｇ中に10-4グラム当量
のマレイン基）とし、スキン樹脂を240℃、内核
材を260℃にて交互射出とした。キヤビテイの可
動部分は、直径40mmの円形とし、可動距離を３mm
とした。（全表面積324cm2、全体積32.4ml）スキン
樹脂射出時間：1.5秒、内核材射出時間：2.5秒、
可動部加圧は150Kg/cm2とした。又、保圧時間を３
秒、冷却時間５秒とし、１サイクルを15秒とし
た。Example In a uniform cavity with a wall thickness of 2 mm as shown in Figure 1, the inner core material was 6-nylon resin (melting point 224°C, specific gravity 1.14), the skin resin was made of maleic anhydride grafted modified polypropylene (MI = 7). ,
The specific gravity was 0.91 (1 g of polyethylene contained 10 -4 gram equivalent of maleic groups), and the skin resin was alternately injected at 240°C and the inner core material at 260°C. The movable part of the cavity is circular with a diameter of 40 mm, and the movable distance is 3 mm.
And so. (Total surface area 324cm 2 , total volume 32.4ml) Skin resin injection time: 1.5 seconds, inner core material injection time: 2.5 seconds,
The pressure applied to the movable part was 150Kg/cm 2 . Also, the pressure holding time is 3
The cooling time was 5 seconds, and one cycle was 15 seconds.
(イ) 可動部を動かさず、従来方式で成形した所、
ゲート反対側のスキン層の肉厚は0.03mmで、接
着強度はＴ字剥離で30ｇ／15mmしかなかつた。
又、ゲート近くのナイロン厚みは、1.8mmと厚
く、又、ゲートから離れた、キヤビテイ周縁部
５〜10mmは、ナイロン層の入らない、ポリプロ
ピレン単層部となつた。(b) Where the movable parts are not moved and molded using the conventional method,
The thickness of the skin layer on the opposite side of the gate was 0.03 mm, and the adhesive strength was only 30 g/15 mm at T-peel.
In addition, the thickness of the nylon near the gate was as thick as 1.8 mm, and the periphery of the cavity 5 to 10 mm away from the gate was a single layer of polypropylene without any nylon layer.
(ロ) 可動部を射出終了0.1秒前から動かして、150
Kg/cm2の圧をかけた。その他の条件は、(イ)と同
じ条件とした所、ゲート反対側のスキン層の厚
みが0.26mmで接着強度は、Ｔ字剥離で850〜
1230ｇ／15mmと大きくなつた。又、ゲートから
離れたキヤビテイ周縁部にも充分ナイロン層が
均一に入つた三層構成になつていた。その他キ
ヤビテイ周縁部のヒケもなく、良好なサンドイ
ツチ構造の製品が得られた。(b) Move the movable part from 0.1 seconds before the end of injection to 150
A pressure of Kg/cm 2 was applied. The other conditions were the same as in (a), the thickness of the skin layer on the opposite side of the gate was 0.26 mm, and the adhesive strength was 850 ~ 850 for T-peeling.
It has become larger at 1230g/15mm. Furthermore, the nylon layer was uniformly distributed in the periphery of the cavity away from the gate, resulting in a three-layer structure. In addition, there were no sink marks on the periphery of the cavity, and a product with a good sandwich structure was obtained.
以上のように、本発明の方法をとれば、従来、
ゲート周辺の偏肉は小さくなり、各層間の接着強
度は向上する。又、ヒケやヘジテンシヨンマーク
なども改良して、良好な多層射出成形品が得られ
る。 As described above, if the method of the present invention is used, conventionally,
The uneven thickness around the gate is reduced, and the adhesive strength between each layer is improved. In addition, sink marks and hesitation marks can be improved, and a good multilayer injection molded product can be obtained.
なお、本発明によれば、内核材を構成する樹脂
として多種類の樹脂を使用し、繰り返して射出す
ることにより、あるいはゲート近くで積層して射
出することにより、三層や五層に限らず、さらに
多層の成形物にも利用できる。また、内核材を構
成する樹脂の一層として、スキン樹脂と同一の樹
脂を使用できることも勿論である。 In addition, according to the present invention, by using various types of resin as the resin constituting the inner core material and by repeatedly injecting them or by laminating them and injecting them near the gate, it is possible to form not only three or five layers but also It can also be used for multilayer molded products. Moreover, it goes without saying that the same resin as the skin resin can be used as one layer of the resin constituting the inner core material.
また、本発明の方法の実施に当たつては金型の
ゲートに相対するキヤビテイ面のみを可動とした
金型を用いているので、従来の射出成形金型の一
部を改造するだけで良いという利点がある。 Furthermore, in carrying out the method of the present invention, a mold in which only the cavity surface facing the mold gate is movable is used, so it is only necessary to modify a part of the conventional injection mold. There is an advantage.
図面は本発明の実施例を示し、第１図及び第３
図は本発明による射出成形方法に使用する金型の
例の断面図である。第２図は射出完了直前の状態
で、これから可動部４が動いて、ゲート周辺部の
肉厚を減少させるところを示す断面図である。
１，１′……雌型（金型）、２，２′……雄型
（金型）、３，３′……ゲート、４，４′……可動
面、５，５′……金型キヤビテイ、６′……スプー
ル、７……スキン樹脂、８……内核材、ｌ……樹
脂とキヤビテイの接し始める線。
The drawings show embodiments of the invention, FIGS. 1 and 3.
The figure is a sectional view of an example of a mold used in the injection molding method according to the present invention. FIG. 2 is a cross-sectional view showing the movable part 4 moving to reduce the wall thickness around the gate immediately before injection is completed. 1, 1'... Female mold (mold), 2, 2'... Male mold (mold), 3, 3'... Gate, 4, 4'... Movable surface, 5, 5'... Gold Mold cavity, 6'...Spool, 7...Skin resin, 8...Inner core material, l...Line where the resin and cavity begin to touch.
Claims (1)
に射出し、引続き該スキン樹脂がキヤビテイ中の
すみすみまでゆき渡るように、スキン樹脂が固化
する前に、一回又は複数回繰り返して、内核材
（樹脂又は積層した樹脂）を、流動状態で前記ス
キン樹脂の内則に射出することからなる、サンド
イツチ式多層射出成形において、金型のゲートに
相対するキヤビテイ面のみを、キヤビテイ容量の
１％分以上の容積分を可動とした、ゲート周辺の
肉厚を変化させることのできる金型を使用し、全
樹脂を射出完了する直前又は直後に金型キヤビテ
イの可動部を動かして、ゲート周辺の肉厚を減少
させることによりゲート周辺の層を均一化させ、
また、層監の接着強度を向上させることを特徴と
する多層射出成形方法。1. The surface skin resin is injected into the mold cavity in a fluid state, and then the inner core material ( In Sand-Deutsch multilayer injection molding, which consists of injecting resin (or laminated resin) in a fluid state into the inner contours of the skin resin, only the cavity surface facing the gate of the mold is injected in an amount equal to or more than 1% of the cavity capacity. Using a mold that can change the wall thickness around the gate, the movable part of the mold cavity is moved just before or after all the resin is injected, and the wall thickness around the gate can be changed by moving the volume of the mold. The layer around the gate is made uniform by reducing the
Also, a multilayer injection molding method characterized by improving the adhesive strength of the layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5053979A JPS55140539A (en) | 1979-04-23 | 1979-04-23 | Multilayer injection forming |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5053979A JPS55140539A (en) | 1979-04-23 | 1979-04-23 | Multilayer injection forming |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55140539A JPS55140539A (en) | 1980-11-04 |
| JPS6142617B2 true JPS6142617B2 (en) | 1986-09-22 |
Family
ID=12861805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5053979A Granted JPS55140539A (en) | 1979-04-23 | 1979-04-23 | Multilayer injection forming |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55140539A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6367132A (en) * | 1986-09-08 | 1988-03-25 | Toyota Motor Corp | Method and apparatus for coloring in injection molding |
| JP2612733B2 (en) * | 1988-02-09 | 1997-05-21 | 本田技研工業株式会社 | Injection compression molding of fiber reinforced plastic products |
| IT1316150B1 (en) * | 2000-11-28 | 2003-03-28 | Intercable Srl | INJECTION MELTING PROCEDURE FOR THE MANUFACTURE OF CAPS OR SIMILAR VENTS, SIZE THICK. |
| WO2004022306A1 (en) * | 2002-09-03 | 2004-03-18 | Polyplastics Co., Ltd. | Method of composite injection molding and mold |
| FR3021578B1 (en) * | 2014-05-28 | 2016-05-27 | Albea Services | METHOD AND DEVICE FOR INJECTION MOLDING A RECEPTACLE, RECEPTACLE OBTAINED |
-
1979
- 1979-04-23 JP JP5053979A patent/JPS55140539A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55140539A (en) | 1980-11-04 |
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