JPH0970860A - Molded product fitted with reinforcing rib and molding thereof - Google Patents
Molded product fitted with reinforcing rib and molding thereofInfo
- Publication number
- JPH0970860A JPH0970860A JP24834095A JP24834095A JPH0970860A JP H0970860 A JPH0970860 A JP H0970860A JP 24834095 A JP24834095 A JP 24834095A JP 24834095 A JP24834095 A JP 24834095A JP H0970860 A JPH0970860 A JP H0970860A
- Authority
- JP
- Japan
- Prior art keywords
- molded product
- reinforcing rib
- molding
- molded
- rib
- 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.)
- Withdrawn
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
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
- B29C45/1705—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using movable mould parts
-
- 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
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
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
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えばテレビを初
めとする家庭電気製品のキャビネット等として用いられ
る補強リブ付成形品及びその成形方法に関する。更に詳
しくは、当該成形品の表面状態の向上に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded product with a reinforcing rib, which is used as a cabinet for household electric appliances such as a television, and a molding method thereof. More specifically, it relates to improvement of the surface condition of the molded product.
【０００２】[0002]
【従来の技術】従来、得られる成形品の表面状態を向上
させる技術として、次のような技術が知られている。2. Description of the Related Art Conventionally, the following techniques have been known as techniques for improving the surface condition of molded articles obtained.
【０００３】（１）補強用リブ等、部分的な厚肉部が存
在する場合のひけによる外観低下を防止するために、こ
の厚肉部に加圧ガスを圧入して中空部を形成することに
より、ひけによる表面状態の悪化を防止する、所謂中空
射出成形（特公昭５７−１４９６８号公報）。(1) In order to prevent deterioration of the appearance due to sink marks when there is a partial thick portion such as a reinforcing rib, pressurizing gas is pressed into this thick portion to form a hollow portion. By so-called hollow injection molding (Japanese Patent Publication No. 57-14968) that prevents deterioration of the surface condition due to sink marks.
【０００４】（２）成形に使用する金型のキャビティ面
に断熱材を付設することや（特開平５−２４５８８１号
公報、実開平６−３４９２７号公報）、この断熱材の表
面に更に薄い金属層を設けること（特開平７−１４８７
８８号公報）。(2) A heat insulating material is attached to the cavity surface of a mold used for molding (Japanese Patent Laid-Open No. 5-245881 and Japanese Utility Model Laid-Open No. 6-34927), and a thinner metal is formed on the surface of the heat insulating material. Providing a layer (Japanese Patent Application Laid-Open No. 7-1487)
No. 88).
【０００５】（３）中空射出成形において、厚肉部に加
圧ガスを圧入する時に発生すると考えられる厚肉部上の
成形品本体表面の歪みを防止するために、一般的な断面
矩形若しくは半円形の補強リブではなく、成形品本体か
らくびれ部を介して先端に駄肉部を設けた断面形状の補
強リブとし、駄肉部に導入される加圧ガスの影響を、く
びれ部の存在によって成形品本体側に及びにくくするこ
と（特開平５−３１７４５公報）。(3) In hollow injection molding, in order to prevent distortion of the surface of the molded article body on the thick portion which is considered to occur when pressurizing gas is injected into the thick portion, a general rectangular cross section or semi-section is used. Instead of a circular reinforcing rib, a reinforcing rib having a cross-sectional shape with a padded portion provided at the tip from the molded product body through a necked portion is used, and the influence of the pressurized gas introduced into the padded portion is reduced by the presence of the necked portion. Make it difficult to reach the molded product body side (JP-A-5-31745).
【０００６】[0006]
【発明が解決しようとする課題】ところで、最近では成
形品を薄肉化する傾向にあり、必要な強度を得るため
に、前記（１）の技術を利用して、成形品本体背面に中
空の太い補強リブを設けることが多くなってきている。
また、この補強リブを成形するためのキャビティの凹部
は、薄肉化された成形品本体を成形するキャビティ末端
にまで溶融樹脂が行き渡りやすくするために、射出成形
時の溶融樹脂の流れ方向にほぼ沿って形成されることが
多い。By the way, recently, there is a tendency that the thickness of the molded product tends to be thin, and in order to obtain the necessary strength, the technique of the above (1) is used to form a thick hollow body on the back surface of the molded product. Increasingly, reinforcing ribs are provided.
In addition, the concave portion of the cavity for molding the reinforcing ribs is formed along the flow direction of the molten resin during injection molding in order to make it easier for the molten resin to reach the end of the cavity for molding the thinned molded body. Often formed.
【０００７】一般的な断面形状の寸法の大きな補強リ
ブ、即ち断面矩形若しくは半円形等の寸法の大きな補強
リブを成形品内に付設すると、補強リブ上の成形品本体
表面に色若しくは艶のむら（以後「リブ痕」という）が
生じてしまう問題がある。このリブ痕とは、例えば成形
品表面部と背面側の補強リブ部を流れる樹脂の配向差に
起因する光沢むらとして観察される欠陥である。また、
成形品本体表面に、補強リブを起点としたウエルド（以
後「ウエルド」という）を生じると共に、前記（３）で
述べたように、加圧ガスを圧入する時に発生すると考え
られる、補強リブに沿った成形品本体表面の歪み（以後
「ガスマーク」という）を生じ、いずれも成形品の外観
低下の原因となる。When a reinforcing rib having a general cross-sectional shape having a large size, that is, a reinforcing rib having a large size such as a rectangular cross section or a semicircular shape is provided in a molded product, color or gloss unevenness ( Hereinafter, there is a problem that "rib traces" occur. The rib mark is a defect that is observed as uneven gloss due to the difference in the orientation of the resin flowing between the surface of the molded product and the reinforcing ribs on the back side. Also,
Welds originating from the reinforcing ribs (hereinafter referred to as "welds") are generated on the surface of the molded product body, and as described in (3) above, along the reinforcing ribs that are considered to occur when pressurizing gas is injected. In addition, distortion of the surface of the molded product body (hereinafter referred to as "gas mark") occurs, which causes deterioration of the appearance of the molded product.
【０００８】そこで、前記（２）の技術を適用して、上
記のような中空の太い補強リブを設けた際の表面欠陥を
解消することが考えられるが、ウエルドは消去できるも
のの、リブ痕についてはある程度軽減できるだけで十分
に消去できず、またガス欠陥はほとんど解消できない問
題がある。Therefore, it is conceivable to eliminate the surface defect when the hollow thick reinforcing rib is provided as described above by applying the technique of (2). Has a problem that it can be reduced to some extent but cannot be erased sufficiently, and gas defects can hardly be eliminated.
【０００９】一方、前記（３）のようなくびれ部と駄肉
部を有する断面形状の補強リブとした場合、ガスマーク
はかなり解消できるものの、やはりリブ痕を生じてしま
う問題がある。加えて、ウエルドを生じる問題もある。On the other hand, in the case of the reinforcing rib having the cross-sectional shape having the constricted portion and the padded portion as in the above (3), although the gas mark can be considerably eliminated, there is still a problem that the rib mark is generated. In addition, there is a problem that welds occur.
【００１０】上記と同様に前記（２）の技術を適用し
て、上記表面欠陥を解消することが考えられる。しか
し、本発明者等の知見によると、ウエルドは解消できる
ものの、リブ痕については確実には消去できず、かなり
消去できる場合とほとんど消去できない場合とが発生す
る。It is conceivable to apply the technique (2) in the same manner as described above to eliminate the surface defects. However, according to the findings of the inventors of the present invention, although the weld can be eliminated, the rib mark cannot be reliably erased, and there are cases in which it can be considerably erased and cases in which it can hardly be erased.
【００１１】本発明は、上記従来の問題点に鑑みてなさ
れたもので、一般的な矩形若しくは半円形断面の補強リ
ブはもとより、くびれ部と駄肉部を有する特別な断面形
状の補強リブの場合でも確実な消去が困難なリブ痕を確
実に消去できるようにすることを目的とする。The present invention has been made in view of the above-mentioned problems of the prior art, and includes not only a general reinforcing rib having a rectangular or semicircular cross section but also a reinforcing rib having a special cross-sectional shape having a constricted portion and a pad portion. It is an object of the present invention to surely remove a rib mark that is difficult to be surely deleted even in a case.
【００１２】[0012]
【課題を解決するための手段】このために請求項１の発
明では、表面が断熱材を付設したキャビティ面によって
成形されており、中空射出成形によって得られた成形品
の背面に中空の補強リブを有する成形品において、補強
リブが、成形品本体からくびれ部を介して突出し、端部
にくびれ部の幅より幅又は径が大きい駄肉部を有する断
面形状とし、しかもこの補強リブを起点として背面に現
われるウエルドの開口角度を５〜６０°としているもの
である。For this reason, in the invention of claim 1, the surface is molded by a cavity surface provided with a heat insulating material, and a hollow reinforcing rib is formed on the back surface of the molded product obtained by hollow injection molding. In the molded product having, the reinforcing rib projects from the molded product body through the constricted portion, and has a cross-sectional shape having a padded portion with a width or diameter larger than the width of the constricted portion at the end, and with this reinforcing rib as the starting point. The opening angle of the weld appearing on the back surface is 5 to 60 °.
【００１３】また、請求項２の発明では、成形品の表面
を成形するキャビティ面に断熱材が付設されており、成
形品の背面を成形するキャビティ面に補強リブを成形す
る凹部が形成された金型を用い、中空の補強リブを有す
る成形品を成形する補強リブ付成形品の成形方法におい
て、補強リブを成形する凹部の形状及び大きさを、成形
される成形品の背面に補強リブを起点として現われるウ
エルドの開口角度が５〜６０°となる形状及び大きさに
設定することとしているものである。According to the second aspect of the invention, a heat insulating material is attached to the cavity surface for molding the surface of the molded product, and a recess for molding the reinforcing rib is formed on the cavity surface for molding the back surface of the molded product. In the method of molding a molded product with reinforcing ribs, which uses a mold to mold a molded product having hollow reinforcing ribs, the shape and size of the concave portion for molding the reinforcing ribs, and the reinforcing ribs on the back surface of the molded product to be molded. The shape and size are such that the opening angle of the weld appearing as the starting point is 5 to 60 °.
【００１４】[0014]
【発明の実施の形態】本発明は、リブ痕の発生原因の究
明に基づいてなされたもので、まずこのリブ痕の発生原
因について説明する。BEST MODE FOR CARRYING OUT THE INVENTION The present invention was made on the basis of the investigation of the cause of the generation of rib marks. First, the cause of the generation of rib marks will be described.
【００１５】図１及び図２に示されるように、一般的な
矩形（若しくは半円形等）の断面形状で、中空部２を有
する補強リブ１を矩形板状の成形品本体３背面の対角線
上に有する成形品を、成形品本体３の中心部に、加圧ガ
スの圧入口を兼ねるゲート位置４を定め、キャビティ面
に断熱層を付設することなく成形した場合、その成形品
本体３の表面に現われる欠陥は図３に示されるような状
態となる。図３において、５がリブ痕、６がガスマー
ク、７がウエルドである。As shown in FIGS. 1 and 2, a reinforcing rib 1 having a hollow portion 2 and having a general rectangular (or semicircular) cross-section is formed on the diagonal line of the back surface of a rectangular plate-shaped molded article body 3. In the case where the molded product having the above-mentioned is molded in the center of the molded product body 3 without forming a heat insulating layer at the gate position 4 which also serves as a pressurizing inlet of the pressurized gas, the surface of the molded product body 3 The defects appearing in 1 are in the state shown in FIG. In FIG. 3, 5 is a rib mark, 6 is a gas mark, and 7 is a weld.
【００１６】図１及び図２に示される成形品を、成形品
本体３の表面（補強リブ１の形成面とは反対面）を成形
するキャビティ面に断熱材を被覆した金型で成形した場
合、成形品本体３の表面に現われる欠陥は図４に示され
るような状態となる。即ち、図３との比較から明らかな
ように、ウエルド７は消え、リブ痕５及びガスマーク６
はやや軽減されるものの十分には解消されずに残留す
る。When the molded product shown in FIGS. 1 and 2 is molded by a mold in which a cavity surface for molding the surface of the molded product body 3 (the surface opposite to the surface on which the reinforcing ribs 1 are formed) is coated with a heat insulating material. The defects appearing on the surface of the molded article body 3 are in the state shown in FIG. That is, as is clear from the comparison with FIG. 3, the weld 7 disappears and the rib mark 5 and the gas mark 6 disappear.
Although it is slightly reduced, it remains without being fully eliminated.
【００１７】ガスマーク６は、従来の技術の項でも述べ
たように、加圧ガスの圧入に起因するものと考えられて
いる。つまり、補強リブ１内での加圧ガスの流れの影響
や加圧ガス圧力の成形品本体３の表面への及び方によっ
て表面凹凸、転写不良等のガスマークが発生すると考え
られる。これに対し、リブ痕５及びウエルド７は全く異
なる原因によるものと考えられる。The gas mark 6 is considered to be caused by pressurization of the pressurized gas, as described in the section of the prior art. That is, it is considered that gas marks such as surface irregularities and transfer defects are generated depending on the influence of the flow of the pressurized gas in the reinforcing ribs 1 and the way the pressurized gas pressure is applied to the surface of the molded product body 3. On the other hand, the rib trace 5 and the weld 7 are considered to be caused by completely different causes.
【００１８】まず、ウエルド７は、キャビティ内での溶
融樹脂の合流によって生じるものであるが、何故このよ
うな合流を生じるかが問題となる。本発明者等の知見に
よると、幅の小さい細い補強リブ１の場合にはこのよう
なウエルド７を生じないことが確認されている。ウエル
ド７は、幅が大きい太い補強リブ１とすることによって
生じるものである。幅の広い太い補強リブ１とすると、
この補強リブ１を成形するためのキャビティの凹部も幅
広で太くなり、この凹部内での溶融樹脂の流動抵抗が小
さくなり、射出成形時にこの凹部内に優先的に溶融樹脂
が流入しやすくなる。つまり、キャビティの成形品本体
３部分が溶融樹脂で満たされる前に、補強リブ１を成形
する凹部に溶融樹脂が優先的に流れ、この凹部を流れる
溶融樹脂と、流動が遅れる成形品本体３部分を流動する
溶融樹脂とが合流することでウエルド７が発生するもの
と考えられる。First, the weld 7 is generated by the merging of the molten resin in the cavity. The problem is why such merging occurs. According to the knowledge of the present inventors, it has been confirmed that such a weld 7 does not occur in the case of a thin reinforcing rib 1 having a small width. The weld 7 is generated by forming the thick reinforcing rib 1 having a large width. With a wide and thick reinforcement rib 1,
The concave portion of the cavity for molding the reinforcing rib 1 is also wide and thick, the flow resistance of the molten resin in the concave portion becomes small, and the molten resin is likely to preferentially flow into the concave portion during injection molding. That is, the molten resin preferentially flows into the concave portion for molding the reinforcing rib 1 before the molded body 3 portion of the cavity is filled with the molten resin, and the molten resin flowing in this concave portion and the molded body 3 portion where the flow is delayed. It is considered that the weld 7 is generated due to the fact that the melted resin flowing in the resin joins.
【００１９】ところで、補強リブ１を成形する凹部と成
形品本体３部分に流れる溶融樹脂は、両者の配向傾向の
相違からリブ痕が５が発生するものと考えられる。By the way, it is considered that, in the molten resin flowing in the concave portion for molding the reinforcing rib 1 and the molded product body 3, rib marks 5 are generated due to the difference in orientation tendency between the two.
【００２０】一方、図５及び図６に示されるように、く
びれ部８と駄肉部９を有する断面形状で、駄肉部９に中
空部２を有する補強リブ１とした場合、キャビティ面に
断熱層を付設することなく成形したときに成形品本体３
の表面に現われる欠陥は図７に示されるような状態とな
る。また、図５及び図６に示される成形品を、成形品本
体３の表面を成形するキャビティ面に断熱材を被覆した
金型で成形した場合、成形品本体３の表面に現われる欠
陥は図８に示されるような状態となる。On the other hand, as shown in FIGS. 5 and 6, when the reinforcing rib 1 has a cross-sectional shape having a constricted portion 8 and a pad 9 and a pad 2 has a hollow portion 2, the cavity surface is Molded product body 3 when molded without attaching a heat insulating layer
The defects appearing on the surface of the are as shown in FIG. Further, when the molded product shown in FIGS. 5 and 6 is molded by a mold in which a cavity surface for molding the surface of the molded product body 3 is coated with a heat insulating material, defects appearing on the surface of the molded product body 3 are shown in FIG. The state becomes as shown in.
【００２１】ところで、くびれ部８と駄肉部９を有する
断面形状の補強リブ１を設けた成形品の場合、成形品本
体３の表面を成形するキャビティ面に断熱材を被覆した
金型で成形すると、図９に示されるように、図８に示さ
れるリブ痕５をほとんど目立たない状態にまで消すこと
ができる場合があることを本発明者等は見出した。By the way, in the case of a molded product provided with a reinforcing rib 1 having a cross-sectional shape having a constricted portion 8 and a pad portion 9, it is molded with a mold in which a cavity surface for molding the surface of the molded product body 3 is coated with a heat insulating material. Then, the present inventors have found that, as shown in FIG. 9, the rib marks 5 shown in FIG. 8 can be erased to a state where they are hardly noticeable.
【００２２】図９に示されるような表面状態が得られる
成形品について、キャビティ面に断熱材を被覆すること
なく成形した時の表面状態が図１０に示される状態であ
る。図７と比較すると明らかなように、ウエルド７の開
口角度が小さくなっている。ウエルド７の開口角度が小
さいことは、射出成形時に、補強リブ１を成形するキャ
ビティの凹部と成形品本体３とを流れる溶融樹脂の流入
差が小さくなっていることを意味する。即ち、この凹部
に流れる溶融樹脂量がくびれ部８によって押えられるこ
とから、凹部が配置されている成形品本体３に流れる溶
融樹脂と、それ以外の成形品本体３に流れる溶融樹脂と
の流入差が小さくなり、両者の配向傾向の違いが少なく
なるため、図８に示されるようなリブ痕５をほとんど目
立たない状態にまで消すことが可能になっていると考え
られる。FIG. 10 shows the surface condition of the molded product having the surface condition shown in FIG. 9 when the cavity surface is molded without coating the heat insulating material. As is clear from comparison with FIG. 7, the opening angle of the weld 7 is small. The small opening angle of the weld 7 means that the difference in inflow of the molten resin flowing between the concave portion of the cavity for molding the reinforcing rib 1 and the molded product body 3 during injection molding is small. That is, since the amount of the molten resin flowing in the concave portion is suppressed by the constricted portion 8, the inflow difference between the molten resin flowing in the molded product body 3 in which the concave portion is arranged and the molten resin flowing in the other molded product body 3 other than that. Is smaller and the difference in orientation tendency between the two becomes smaller, so it is considered possible to eliminate the rib mark 5 as shown in FIG. 8 to a state where it is hardly noticeable.
【００２３】本発明は、以上のような本発明者等の知見
に基づいてなされたもので、その第１の特徴は、成形品
本体３の表面が断熱材が被覆されたキャビティ面によっ
て成形されている点にある。この断熱材は、ウエルド７
を消すと共に、リブ痕５を低減するものである。The present invention has been made based on the above findings of the present inventors. The first feature of the present invention is that the surface of the molded article body 3 is molded by a cavity surface coated with a heat insulating material. There is a point. This insulation is weld 7
Is eliminated and the rib mark 5 is reduced.
【００２４】断熱材としては、熱伝導率が一般に０．０
００１〜０．００２ｃａｌ／ｃｍ・ｓｅｃ・℃で、金型
の構成材料より熱伝導率の低い耐熱樹脂が好ましい。こ
の耐熱樹脂とは、成形される合成樹脂の成形温度より高
い軟化温度を有する耐熱性重合体であり、好ましくはガ
ラス転移点温度が１４０℃以上、更に好ましくは１６０
℃以上、最も好ましくは２００℃以上及び／又は好まし
くは融点が２００℃以上、更に好ましくは２５０℃以上
の耐熱性重合体である。例えば主鎖に芳香族環を有する
ポリイミド、ポリスルホン、ポリエーテルスルホン、ポ
リアリルスルホン、ポリアリレート、ポリフェニレンエ
ーテル、ポリエーテルイミド、エポキシ樹脂等の芳香族
系重合体や各種充填材、例えばガラス、シリカ、タル
ク、クレー、珪酸ジルコニウム、珪酸リチウム、炭酸カ
ルシウム、アルミナ、マイカ等の粉体や粒子、ガラス繊
維、ウイスカー、炭素繊維等の適量を配合した重合体、
又は例えばエポキシ樹脂にポリエーテルスルホンやポリ
エーテルイミドを配合して硬化したポリマーアロイ等を
挙げることができ、好ましくはポリイミドである。As a heat insulating material, the thermal conductivity is generally 0.0
A heat-resistant resin having a thermal conductivity of 001 to 0.002 cal / cm · sec · ° C and lower than that of the constituent material of the mold is preferable. The heat-resistant resin is a heat-resistant polymer having a softening temperature higher than the molding temperature of the synthetic resin to be molded, and preferably has a glass transition temperature of 140 ° C. or higher, more preferably 160.
A heat-resistant polymer having a melting point of 200 ° C. or higher, most preferably 200 ° C. or higher, and / or a melting point of 200 ° C. or higher, and more preferably 250 ° C. or higher. For example, polyimide having an aromatic ring in the main chain, polysulfone, polyether sulfone, polyallyl sulfone, polyarylate, polyphenylene ether, polyetherimide, various fillers such as epoxy resin and various fillers, such as glass, silica, Talc, clay, zirconium silicate, lithium silicate, calcium carbonate, alumina, mica and other powders and particles, glass fiber, whiskers, carbon fibers, etc.
Alternatively, for example, a polymer alloy obtained by mixing an epoxy resin with polyether sulfone or polyether imide and curing the same can be used, and a polyimide is preferable.
【００２５】上記耐熱樹脂を用いた断熱材の付設は、溶
液としてキャビティ面に塗布するのが最も簡便で好まし
い。従って、溶液となる非結晶性芳香族重合体あるいは
ポリアミド酸等のポリイミド前駆体を良好に使用でき
る。ここでポリイミドとしては、例えばピロメリット酸
（ＰＭＤＡ）系ポリイミド、ビフェニルテトラカルボン
酸系ポリイミド、トリメリット酸を用いたポリアミドイ
ミド、ビスマレイミド系樹脂（ビスマレイミド／トリイ
ジン系等）、ベンゾフェノンテトラカルボン酸系ポリイ
ミド、アセチレン末端ポリイミド、熱可塑性ポリイミド
等を挙げることができる。The attachment of the heat insulating material using the above heat resistant resin is most conveniently and preferably applied as a solution to the cavity surface. Therefore, a non-crystalline aromatic polymer or a polyimide precursor such as a polyamic acid which is a solution can be favorably used. Here, as the polyimide, for example, pyromellitic acid (PMDA) -based polyimide, biphenyltetracarboxylic acid-based polyimide, polyamideimide using trimellitic acid, bismaleimide-based resin (bismaleimide / triidine-based, etc.), benzophenone tetracarboxylic acid-based Examples thereof include polyimide, acetylene-terminated polyimide, and thermoplastic polyimide.
【００２６】付設する断熱材の厚みは、断熱材の材質に
もよるが、０．１〜２ｍｍの範囲内で適度に選択され
る。断熱材の厚みは成形品の金型内冷却時間と密接に関
連しているため、外観改良と成形サイクルタイムのバラ
ンスを考慮すると、断熱材の厚みは、好ましくは０．１
〜０．５ｍｍ、特に好ましくは０．１５〜０．４５ｍｍ
である。付設する断熱材は、厚みが上記範囲内であれ
ば、単層又は２層以上の場合でも良好に使用できる。The thickness of the attached heat insulating material depends on the material of the heat insulating material, but is appropriately selected within the range of 0.1 to 2 mm. Since the thickness of the heat insulating material is closely related to the cooling time in the mold of the molded product, the thickness of the heat insulating material is preferably 0.1 in consideration of the balance between the appearance improvement and the molding cycle time.
~ 0.5 mm, particularly preferably 0.15 to 0.45 mm
It is. If the thickness of the attached heat insulating material is within the above range, it can be favorably used even in the case of a single layer or two or more layers.
【００２７】断熱材の付設は、断熱材が直接キャビティ
面を構成するように行ってもよいが、断熱材の表面に薄
い金属層を被覆し、断熱材の保護等を図ることができる
ようにすることもできる。金属としては、ニッケル、ク
ロム、コンスタンタン、アルミニウム、銅、ベリリウ
ム、亜鉛、若しくはこれらの合金等の１種又は２種以上
を用いることができる。金属層はメッキによって容易に
付設することができ、その厚みは、主要金型に断熱層を
被覆した効果、例えば型表面再現性の向上が阻害されな
いことが必要で、断熱材の１／５以下でかつ１〜５０μ
ｍであることが好ましく、更に好ましくは１／７以下で
かつ２〜３０μｍであり、最適には１／１０〜１／１０
０でかつ２〜３０μｍである。The heat insulating material may be attached so that the heat insulating material directly forms the cavity surface, but the surface of the heat insulating material may be covered with a thin metal layer to protect the heat insulating material. You can also do it. As the metal, one kind or two or more kinds of nickel, chromium, constantan, aluminum, copper, beryllium, zinc, or alloys thereof can be used. The metal layer can be easily attached by plating, and its thickness needs to be such that the effect of coating the heat insulating layer on the main mold, for example, improvement of mold surface reproducibility, is not hindered, and is 1/5 or less of the heat insulating material. And 1 to 50μ
m, more preferably 1/7 or less and 2 to 30 μm, most preferably 1/10 to 1/10.
It is 0 and it is 2-30 micrometers.
【００２８】本発明の第２の特徴は、成形品内に設けら
れた補強リブ１が、図６に示されるように、成形品本体
３からくびれ部８を介して突出し、端部にくびれ部８の
幅より幅又は径が大きくかつ中空の駄肉部９を有する断
面形状をなしている点にある。くびれ部８は、前述のよ
うに、補強リブ１を成形するキャビティの凹部が設置し
てある成形品本体３に流れる溶融樹脂量を抑えるもの
で、駄肉部９は必要な補強効果を得るためのものであ
る。The second feature of the present invention is that the reinforcing ribs 1 provided in the molded product project from the molded product body 3 through the constricted portion 8 and the constricted portion at the end, as shown in FIG. 8 is larger in width or diameter than the width of 8, and has a hollow cross section 9 having a hollow pad portion 9. As described above, the constricted portion 8 suppresses the amount of molten resin flowing into the molded product main body 3 in which the concave portion of the cavity for molding the reinforcing rib 1 is installed, and the pad portion 9 is for obtaining the necessary reinforcing effect. belongs to.
【００２９】上記くびれ部８及び駄肉部９を有する補強
リブ１の断面形状例としては、図６に示されるような断
面円形の駄肉部９とした形状の他、図１１に示されるよ
うなものが挙げられる。図１１（ａ）は駄肉部９を矩形
にしたものである。図１１（ｂ）はくびれ部８の成形品
本体３側を徐々に拡幅した形状としたものであり、図１
１（ｃ）は駄肉部９を楕円形にしたものである。また、
図１１（ｂ）のように、くびれ部８の成形品本体３側を
徐々に拡幅した形状とした場合、図１１（ａ）の形状の
ものに比べて、大きな断面積の駄肉部９とした時にリブ
痕５を目立ちにくくすることができる。Examples of the cross-sectional shape of the reinforcing rib 1 having the constricted portion 8 and the pad portion 9 are shown in FIG. 11 in addition to the shape of the pad portion 9 having a circular cross section as shown in FIG. There are many things. In FIG. 11A, the pad 9 is rectangular. FIG. 11B shows a shape in which the constricted portion 8 side of the molded product body 3 is gradually widened.
1 (c) is an elliptical shape of the pad portion 9. Also,
As shown in FIG. 11B, when the shape of the constricted portion 8 on the side of the molded article body 3 is gradually widened, the flesh portion 9 having a larger cross-sectional area than that of the shape shown in FIG. It is possible to make the rib marks 5 inconspicuous when doing.
【００３０】上記補強リブ１の各部の大きさは使用合成
樹脂の種類や成形条件等によっても変わるので、ウエル
ド７の開口角度が５〜６０°の範囲に入るように調整す
る必要がある。ウエルド７の開口角度が５°未満では、
補強上必要な駄肉部９の断面積が得られず、薄肉の成形
品本体３とした時の補強が不十分となる。また、ウエル
ド７の開口角度が６０°を超えると、図８に示されるよ
うにリブ痕５を目立ちにくくすることができなくなる。Since the size of each part of the reinforcing rib 1 varies depending on the type of synthetic resin used, molding conditions, etc., it is necessary to adjust the opening angle of the weld 7 to fall within the range of 5 to 60 °. If the opening angle of the weld 7 is less than 5 °,
The cross-sectional area of the pad 9 that is necessary for reinforcement cannot be obtained, and the reinforcement is insufficient when the molded body 3 is thin. Further, if the opening angle of the weld 7 exceeds 60 °, the rib mark 5 cannot be made conspicuous as shown in FIG.
【００３１】つまり、補強上大きな駄肉部９を必要とす
る成形品においては、くびれ部８を介することで、矩
形、半円形の補強リブに比べて、同じ断面積を持たせた
場合であっても、ウエルド７の開口角度を５〜６０°の
範囲に調整することができる。逆にいうと、補強上大き
な駄肉部９を必要としない場合の成形品においては、ウ
エルドの開口角度を５〜６０°の範囲に調整すれば、敢
えてくびれ部８と駄肉部９を有する断面形状としなくと
もよい。In other words, in the case of a molded product requiring a large pad portion 9 for reinforcement, it is possible to provide the same cross-sectional area as compared with a rectangular or semicircular reinforcing rib by interposing the constricted portion 8. However, the opening angle of the weld 7 can be adjusted within the range of 5 to 60 °. Conversely, in the case of a molded product that does not require a large pad portion 9 for reinforcement, if the weld opening angle is adjusted within the range of 5 to 60 °, the constricted portion 8 and the pad portion 9 are intentionally provided. The cross-sectional shape does not have to be formed.
【００３２】即ち、本発明の第３の特徴は、ウエルド７
の開口角度が５〜６０°の範囲となっている点にある。
本発明の成形品では、断熱材が被覆されたキャビティ面
でその成形品本体３の表面が成形されているので、表面
におけるウエルド７は消去されている。しかし、背面側
はウエルド７が消去されずにそのまま残留することか
ら、背面側に残留するウエルドの状態を調べることでウ
エルド７の開口角度を確認することができる。ウエルド
７の開口角度は上記のように５〜６０°であることが必
要で、好ましくは５〜５０°である。このウエルド７の
開口角度は、図１２に示されるように、ウエルド７がそ
の中心線１０より最も離れた点とウエルド７の始点を結
ぶ線１１と中心線１０とがなす角度をいう。また、ここ
でいう中心線１０とは、ウエルド７の始点近傍での、成
形品背面側の補強リブの中心線を投影した線である。ウ
エルド７は、この中心線１０上あるいは中心線１０より
多少離れた位置に始点を持ちながら、中心線１０を境に
対称や非対称に中心線１０の両側に発生する場合と、中
心線１０の片側にのみ発生する場合とがある。That is, the third feature of the present invention is that the weld 7
The opening angle of is in the range of 5 to 60 °.
In the molded product of the present invention, since the surface of the molded product body 3 is molded with the cavity surface coated with the heat insulating material, the weld 7 on the surface is erased. However, since the weld 7 remains on the back side without being erased, the opening angle of the weld 7 can be confirmed by examining the state of the weld remaining on the back side. The opening angle of the weld 7 needs to be 5 to 60 ° as described above, and is preferably 5 to 50 °. As shown in FIG. 12, the opening angle of the weld 7 refers to an angle formed by the center line 10 and a line 11 connecting the point where the weld 7 is farthest from the center line 10 and the starting point of the weld 7. Further, the center line 10 mentioned here is a line obtained by projecting the center line of the reinforcing rib on the back surface side of the molded product in the vicinity of the starting point of the weld 7. The weld 7 has a starting point on the center line 10 or at a position slightly distant from the center line 10, but occurs on both sides of the center line 10 symmetrically or asymmetrically with respect to the center line 10, and on one side of the center line 10. It may occur only in the.
【００３３】補強上大きな駄肉部９を必要とする場合に
ついて更に説明する。The case where a large pad 9 is required for reinforcement will be further described.
【００３４】くびれ部８の幅は、成形品本体３の厚みの
１．５倍以下であることが好ましく、更に好ましくは成
形品本体３の厚みの１倍以下、最適には成形品本体３の
厚みの２／３以下１／３以上である。また、リブ痕５は
補強リブ１の断面積（補強リブ１に連なる成形品本体３
部分は含まず）が２０ｍｍ2 以上となると特に消去しに
くくなることから、このような大きな断面積の補強効果
の高い補強リブ１とする場合に有効である。補強効果の
高い補強リブ１をくびれ部８を介して設置すると、大き
な駄肉部９での成形収縮に伴う歪みが駄肉部９内で緩和
され、成形品表面に及びにくくなるため、駄肉部９の型
再現性がそれほど重視されない成形品であれば、敢えて
加圧ガスを圧入せずに成形してもよい。換言すれば、補
強リブ１に敢えて中空部２が形成されていなくともよ
い。The width of the constricted portion 8 is preferably 1.5 times or less of the thickness of the molded article body 3, more preferably 1 times or less of the thickness of the molded article body 3, and most preferably of the molded article body 3. It is 2/3 or less and 1/3 or more of the thickness. In addition, the rib mark 5 is a cross-sectional area of the reinforcing rib 1 (the main body 3 of the molded product continuous with the reinforcing rib 1).
When the reinforcing rib 1 has a large cross-sectional area and a high reinforcing effect, it is effective when it is 20 mm 2 or more. When the reinforcing rib 1 having a high reinforcing effect is installed through the constricted portion 8, the distortion caused by the molding shrinkage in the large pad portion 9 is relieved in the pad portion 9 and becomes difficult to reach the surface of the molded product. If the mold reproducibility of the part 9 is not so important, the molded product may be molded without pressurizing the pressurized gas. In other words, the hollow portion 2 does not have to be intentionally formed in the reinforcing rib 1.
【００３５】補強リブ１の各部の大きさを定める目安と
して、図１３に示されるように、くびれ部８の成形品本
体３側が徐々に拡幅されている場合であって、図１３に
示されるａとｂの比ａ／ｂが１．５を超える場合、図１
３に示される面積Ａと面積Ｂの比Ａ／Ｂが０．５〜４．
０、更に好ましくは０．３〜３．０、最適には０．５〜
１．５の範囲に入るよう、各部の大きさを定めることが
好ましい。また、図１４に示されるように、くびれ部８
が上記のような拡幅部分を有さず、図１４に示されるａ
／ｂが１．５以下の場合、図１４に示される面積Ａと面
積Ｂの比Ａ／Ｂが０．２〜２．０、更に好ましくは０．
２〜１．６、最適には０．２〜１．５の範囲に入るよ
う、各部の大きさを定めることが好ましい。As a guide for determining the size of each part of the reinforcing rib 1, as shown in FIG. 13, a case where the constricted part 8 of the molded product body 3 side is gradually widened is shown in FIG. When the ratio a / b of s and b exceeds 1.5,
The ratio A / B of the area A and the area B shown in 3 is 0.5 to 4.
0, more preferably 0.3 to 3.0, most preferably 0.5 to
It is preferable to determine the size of each part so that it falls within the range of 1.5. In addition, as shown in FIG.
Does not have the widened part as described above, and a shown in FIG.
/ B is 1.5 or less, the ratio A / B of the area A and the area B shown in FIG. 14 is 0.2 to 2.0, and more preferably 0.
It is preferable to determine the size of each part so that it falls within the range of 2 to 1.6, and optimally 0.2 to 1.5.
【００３６】本発明で使用する合成樹脂は、通常の射出
成形で使用される熱可塑性樹脂を広く用いることができ
るが、ゴムを配合した合成樹脂、例えばポリスチレン、
ＡＢＳ、ＥＰＲ−ＰＰ等の樹脂はゴム粒子が配向しやす
く、目立つリブ痕５を生じやすいことから、特に本発明
を適用することが効果的である。As the synthetic resin used in the present invention, thermoplastic resins used in ordinary injection molding can be widely used, but synthetic resins containing rubber, for example, polystyrene,
In the case of resins such as ABS and EPR-PP, rubber particles are easily oriented and prominent rib marks 5 are likely to occur, so that application of the present invention is particularly effective.
【００３７】[0037]
実施例１〜１０ 図１５〜図１７に示される形状及び寸法（図１５〜図１
７中の数字の単位はｍｍ）の補強リブを図５のように配
置した成形品を成形した。金型としては、成形品表面側
のキャビティ面にポリイミドを２００μｍの厚さで被覆
したものを使用した。また、成形条件は以下の通りであ
る。Examples 1 to 10 Shapes and dimensions shown in FIGS. 15 to 17 (FIGS. 15 to 1)
A molded product was formed by arranging reinforcing ribs of which the unit of the number in 7 is mm) as shown in FIG. The mold used was one in which the cavity surface on the surface side of the molded product was coated with polyimide to a thickness of 200 μm. The molding conditions are as follows.
【００３８】使用樹脂：ポリスチレン（旭化成工業社製
「ＡＧＩ０２」」） 可塑化温度：２２０℃ 金型温度：５０℃ 加圧ガス：窒素ガス（１８０ｋｇ／ｃｍ2 Ｇ） 加圧ガス圧入時間＋圧力保持時間：３５秒 冷却時間：４５秒Resin used: polystyrene (“AGI02” manufactured by Asahi Kasei Corp.) Plasticization temperature: 220 ° C. Mold temperature: 50 ° C. Pressurized gas: Nitrogen gas (180 kg / cm 2 G) Pressurized gas injection time + pressure retention Time: 35 seconds Cooling time: 45 seconds
【００３９】実施例１〜実施例１０で得られた成形品背
面に現われたウエルドの開口角度は以下の通りである。
また、括弧内は補強リブ部分のみ（補強リブに連なる成
形品本体部分は含まず）の断面積である。The opening angle of the weld appearing on the back surface of the molded article obtained in Examples 1 to 10 is as follows.
In addition, the inside of the parentheses is a cross-sectional area of only the reinforcing rib portion (not including the main body of the molded product that is continuous with the reinforcing rib).
【００４０】 実施例１：８°（２０．０６ｍｍ2 ） 実施例２：１３°（３７．２６ｍｍ2 ） 実施例３：３３°（５７．７４ｍｍ2 ） 実施例４：３３°（７２．５１ｍｍ2 ） 実施例５：４３°（８６．００ｍｍ2 ） 実施例６：６０°（１２０．５４ｍｍ2 ） 実施例７：３３°（５７．０ｍｍ2 ） 実施例８：４９°（９９．８８ｍｍ2 ） 実施例９：７７°（１３４．４２ｍｍ2 ） 実施例１０：４７°（７２．８９ｍｍ2 ）Example 1: 8 ° (20.06 mm 2 ) Example 2: 13 ° (37.26 mm 2 ) Example 3: 33 ° (57.74 mm 2 ) Example 4: 33 ° (72.51 mm 2) ) Example 5: 43 ° (86.00 mm 2 ) Example 6: 60 ° (120.54 mm 2 ) Example 7: 33 ° (57.0 mm 2 ) Example 8: 49 ° (99.88 mm 2 ) Implementation Example 9: 77 ° (134.42 mm 2 ) Example 10: 47 ° (72.89 mm 2 )
【００４１】上記実施例１〜実施例１０のいずれの場合
も、得られた成形品表面にリブ痕、ウエルド、ガスマー
クのいずれもほとんど観察されなかった。但し、リブ痕
については、ウエルドの開口角度が大きくなるにつれて
痕跡が認めやすい状態になる傾向が認められた。また、
くびれ部の成形品本体側を徐々に拡幅した形状とした場
合、大きな断面積の駄肉部としてもリブ痕を目立ちにく
くできる傾向も認められた。In any of the above Examples 1 to 10, almost no rib marks, welds or gas marks were observed on the surface of the obtained molded product. However, with respect to the rib trace, it was recognized that the trace was likely to be recognized as the opening angle of the weld was increased. Also,
When the shape of the constricted portion on the side of the molded product body was gradually widened, it was also recognized that the rib traces could be made less noticeable even when the flesh portion had a large cross-sectional area.
【００４２】比較例１〜４ 図１８に示される形状及び寸法（図１８中の数字の単位
はｍｍ）の補強リブを図１のように配置した成形品を成
形した以外は実施例と同様にして成形を行った。Comparative Examples 1 to 4 In the same manner as in the example except that a reinforcing rib having the shape and dimensions shown in FIG. 18 (the unit of the number in FIG. 18 is mm) is arranged as shown in FIG. And molded.
【００４３】比較例１〜比較例４で得られた成形品背面
に現われたウエルドの開口角度は以下の通りである。ま
た、括弧内は補強リブ部分のみ（補強リブに連なる成形
品本体部分は含まず）の断面積である。The opening angles of the welds appearing on the back surface of the molded articles obtained in Comparative Examples 1 to 4 are as follows. In addition, the inside of the parentheses is a cross-sectional area of only the reinforcing rib portion (not including the main body of the molded product that is continuous with the reinforcing rib).
【００４４】 比較例１：７１．５°（５７．７６ｍｍ2 ） 比較例２：７７°（５７．０ｍｍ2 ） 比較例３：７７°（７２．２５ｍｍ2 ） 比較例４：７８．５°（１２１ｍｍ2 ）Comparative Example 1: 71.5 ° (57.76 mm 2 ) Comparative Example 2: 77 ° (57.0 mm 2 ) Comparative Example 3: 77 ° (72.25 mm 2 ) Comparative Example 4: 78.5 ° ( 121 mm 2 )
【００４５】上記比較例１〜比較例４のいずれの場合
も、得られた成形品表面にリブ痕がはっきりと観察され
た。また、リブ痕は、ウエルドの開口角度が大きくなる
につれて痕跡が目立つ傾向が認められた。In each of Comparative Examples 1 to 4, rib marks were clearly observed on the surface of the obtained molded product. In addition, the rib marks tended to stand out as the opening angle of the weld increased.
【００４６】[0046]
【発明の効果】本発明は、以上説明した通りであり、成
形品の薄肉化に伴って必要となる断面積の大きな太い補
強リブを設けるに際し、このような補強リブに起因する
リブ痕をほとんど目立たない程度にまで消去することが
でき、成形品の外観が向上し、無塗装で成形品を使用に
供することが可能となるものである。As described above, according to the present invention, when a thick reinforcing rib having a large cross-sectional area, which is necessary as a molded product is made thinner, is provided, rib marks caused by such reinforcing rib are almost eliminated. It can be erased to an inconspicuous degree, the appearance of the molded product is improved, and the molded product can be used without painting.
【図１】駄肉部の大きな断面矩形の補強リブを設けた板
状成形品の平面図である。FIG. 1 is a plan view of a plate-shaped molded product provided with a reinforcing rib having a large cross-section rectangular shape of a pad.
【図２】図１の成形品における補強リブ付近の拡大断面
図である。FIG. 2 is an enlarged cross-sectional view near a reinforcing rib in the molded product of FIG.
【図３】図１の成形品を通常の金型で成形した場合の表
面状態を示す図である。FIG. 3 is a diagram showing a surface condition when the molded product of FIG. 1 is molded by a normal die.
【図４】図１の成形品を、表面側キャビティ面に断熱材
を被覆した金型で成形した場合の表面状態を示す図であ
る。FIG. 4 is a view showing a surface state when the molded product of FIG. 1 is molded by a mold in which a surface side cavity surface is covered with a heat insulating material.
【図５】くびれ部と駄肉部を有する補強リブを設けた板
状成形品の平面図である。FIG. 5 is a plan view of a plate-shaped molded product provided with a reinforcing rib having a constricted portion and a pad portion.
【図６】図５の成形品における補強リブ付近の拡大断面
図である。FIG. 6 is an enlarged cross-sectional view near a reinforcing rib in the molded product of FIG.
【図７】図５の成形品であって、ウエルドの開口角度が
６０°を超える成形品を通常の金型で成形した場合の表
面状態を示す図である。FIG. 7 is a view showing a surface state of the molded product of FIG. 5 having a weld opening angle of more than 60 ° when molded by a normal mold.
【図８】図５の成形品であって、ウエルドの開口角度が
６０°を超える成形品を、表面側キャビティ面に断熱材
を被覆した金型で成形した場合の表面状態を示す図であ
る。FIG. 8 is a view showing a surface state of the molded product of FIG. 5 having a weld opening angle of more than 60 °, which is molded by a mold having a surface side cavity surface coated with a heat insulating material. .
【図９】図５の成形品であって、ウエルドの開口角度が
５〜６０°の成形品を、表面側キャビティ面に断熱材を
被覆した金型で成形した場合の表面状態を示す図であ
る。9 is a view showing a surface condition of the molded product of FIG. 5 having a weld opening angle of 5 to 60 °, which is molded by a mold having a surface side cavity surface coated with a heat insulating material. is there.
【図１０】図５の成形品であって、ウエルドの開口角度
が５〜６０°の成形品を通常の金型で成形した場合の表
面状態を示す図である。FIG. 10 is a view showing a surface condition of the molded product of FIG. 5 having a weld opening angle of 5 to 60 ° when molded with a normal mold.
【図１１】くびれ部と駄肉部を有する補強リブの形状例
を示す断面図である。FIG. 11 is a cross-sectional view showing a shape example of a reinforcing rib having a constricted portion and a pad portion.
【図１２】ウエルドの開口角度の説明図である。FIG. 12 is an explanatory diagram of an opening angle of a weld.
【図１３】くびれ部と駄肉部を有する補強リブの好まし
い寸法範囲の説明図である。FIG. 13 is an explanatory view of a preferable dimensional range of a reinforcing rib having a neck portion and a pad portion.
【図１４】くびれ部と駄肉部を有する補強リブの好まし
い寸法範囲の説明図である。FIG. 14 is an explanatory diagram of a preferable dimensional range of the reinforcing rib having the constricted portion and the pad portion.
【図１５】実施例１〜４で成形した成形品の補強リブの
説明図である。FIG. 15 is an explanatory diagram of reinforcing ribs of molded products molded in Examples 1 to 4.
【図１６】実施例５〜７で成形した成形品の補強リブの
説明図である。FIG. 16 is an explanatory diagram of reinforcing ribs of molded products molded in Examples 5 to 7.
【図１７】実施例８〜１０で成形した成形品の補強リブ
の説明図である。FIG. 17 is an explanatory diagram of reinforcing ribs of molded products molded in Examples 8 to 10.
【図１８】比較例１〜４で成形した成形品の補強リブの
説明図である。FIG. 18 is an explanatory view of reinforcing ribs of molded products molded in Comparative Examples 1 to 4.
１ 補強リブ ２ 中空部 ３ 成形品本体 ４ ゲート位置 ５ リブ痕 ６ ガスマーク ７ ウエルド ８ くびれ部 ９ 駄肉部 １０ 中心線 １１ 中心線より最も離れた点とウエルドの始点を結ぶ
線1 Reinforcement rib 2 Hollow part 3 Molded product body 4 Gate position 5 Rib mark 6 Gas mark 7 Weld 8 Constriction part 9 Paddle part 10 Center line 11 Line connecting the point farthest from the center line and the start point of weld
Claims (2)
よって成形されており、中空射出成形によって得られた
成形品の背面に中空の補強リブを有する成形品におい
て、補強リブが、成形品本体からくびれ部を介して突出
し、端部にくびれ部の幅より幅又は径が大きい駄肉部を
有する断面形状をなし、しかもこの補強リブを起点とし
て背面に現われるウエルドの開口角度が５〜６０°とな
っていることを特徴とする補強リブ付成形品。1. A molded article having a cavity formed with a heat insulating material on the surface thereof and having hollow reinforcing ribs on the back surface of the molded article obtained by hollow injection molding. It has a cross-sectional shape that protrudes through the constricted part and has a padded part at the end that has a width or diameter larger than the width of the constricted part, and the opening angle of the weld appearing on the back surface from this reinforcing rib is 5 to 60 °. Molded product with reinforcing ribs.
断熱材が付設されており、成形品の背面を成形するキャ
ビティ面に補強リブを成形する凹部が形成された金型を
用い、中空の補強リブを有する成形品を成形する補強リ
ブ付成形品の成形方法において、補強リブを成形する凹
部の形状及び大きさを、成形される成形品の背面に補強
リブを起点として現われるウエルドの開口角度が５〜６
０°となる形状及び大きさに設定することを特徴とする
補強リブ付成形品の成形方法。2. A mold having a cavity surface for molding a surface of a molded article provided with a heat insulating material, and a cavity surface for molding a back surface of the molded article having a concave portion for molding a reinforcing rib is used. In the method of molding a molded product with a reinforcing rib for molding a molded product having a reinforcing rib, the shape and size of the recess for molding the reinforcing rib are defined by the opening angle of the weld appearing on the back surface of the molded product starting from the reinforcing rib. Is 5-6
A method for molding a molded product with reinforcing ribs, which comprises setting the shape and size to be 0 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24834095A JPH0970860A (en) | 1995-09-04 | 1995-09-04 | Molded product fitted with reinforcing rib and molding thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24834095A JPH0970860A (en) | 1995-09-04 | 1995-09-04 | Molded product fitted with reinforcing rib and molding thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0970860A true JPH0970860A (en) | 1997-03-18 |
Family
ID=17176636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24834095A Withdrawn JPH0970860A (en) | 1995-09-04 | 1995-09-04 | Molded product fitted with reinforcing rib and molding thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0970860A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011143589A (en) * | 2010-01-13 | 2011-07-28 | Canon Inc | Resin molded part and mold for molding resin |
| WO2017154176A1 (en) * | 2016-03-10 | 2017-09-14 | 日立化成株式会社 | Resin molded article |
| US9976430B2 (en) | 2013-06-06 | 2018-05-22 | Ihi Corporation | Blade in fan, and fan |
| US10465555B2 (en) | 2014-11-17 | 2019-11-05 | Ihi Corporation | Airfoil for axial flow machine |
| CN114477323A (en) * | 2022-01-10 | 2022-05-13 | 珠海格力电器股份有限公司 | Lock structure and purifier |
-
1995
- 1995-09-04 JP JP24834095A patent/JPH0970860A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011143589A (en) * | 2010-01-13 | 2011-07-28 | Canon Inc | Resin molded part and mold for molding resin |
| US9976430B2 (en) | 2013-06-06 | 2018-05-22 | Ihi Corporation | Blade in fan, and fan |
| US10465555B2 (en) | 2014-11-17 | 2019-11-05 | Ihi Corporation | Airfoil for axial flow machine |
| WO2017154176A1 (en) * | 2016-03-10 | 2017-09-14 | 日立化成株式会社 | Resin molded article |
| CN114477323A (en) * | 2022-01-10 | 2022-05-13 | 珠海格力电器股份有限公司 | Lock structure and purifier |
| CN114477323B (en) * | 2022-01-10 | 2023-04-25 | 珠海格力电器股份有限公司 | Buckling structure and water purifier |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20021105 |