JP3236656B2 - Blow-molded double-wall structure and method of manufacturing the same - Google Patents
Blow-molded double-wall structure and method of manufacturing the sameInfo
- Publication number
- JP3236656B2 JP3236656B2 JP08982392A JP8982392A JP3236656B2 JP 3236656 B2 JP3236656 B2 JP 3236656B2 JP 08982392 A JP08982392 A JP 08982392A JP 8982392 A JP8982392 A JP 8982392A JP 3236656 B2 JP3236656 B2 JP 3236656B2
- Authority
- JP
- Japan
- Prior art keywords
- wall
- rib
- concave
- ribs
- parison
- 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 - Fee Related
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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
- B29C49/4802—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
- B29C49/4802—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity
- B29C2049/4807—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity by movable mould parts in the mould halves
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/04—Extrusion blow-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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/48—Moulds
- B29C49/4802—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity
- B29C49/4812—Moulds with means for locally compressing part(s) of the parison in the main blowing cavity and welding opposite wall parts of the parisons or preforms to each other
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、熱可塑性樹脂材料から
ブロー成形により製造されたブロー成形製二重壁構造体
およびその製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blow-molded double-walled structure manufactured by blow-molding a thermoplastic resin material and a method of manufacturing the same.
【０００２】[0002]
【従来の技術】従来、ブロー成形によって製造されたブ
ロー成形製二重壁構造体としては、次に記載する
（イ）、（ロ）等がある。2. Description of the Related Art Conventionally, blow molded double wall structures manufactured by blow molding include the following (a) and (b).
【０００３】（イ） 熱可塑性樹脂製の建具であって、
図６の（Ａ）に示すように、パリスンをエアブローして
一体に形成した中空の板体を主構成体とし、かつ主構成
体は内部に左面板１０１と右面板１０２とにわたり一体
に形成されたパリスンの一部による所要数の補強板１０
３を所要位置に有するもの（特開昭５８−１０１９８８
号公報参照）。(A) A fitting made of a thermoplastic resin,
As shown in FIG. 6A, a hollow plate body integrally formed by air blowing a parison is used as a main component, and the main component is formed integrally with a left face plate 101 and a right face plate 102 therein. Required number of stiffeners 10 by part of the parison
3 at a required position (Japanese Patent Laid-Open No. 58-101988).
Reference).
【０００４】（ロ）図６の（Ｂ）に示すように、熱可塑
性プラスチック材料をブローして中空二重壁構造体とし
たものであって、ブロー成形時に、溶融したパリスンの
一部を圧縮して二重壁間を一体に結合するウエルドリブ
２０３を形成し、上記ウエルドリブ２０３は、その突出
先端部の内幅をウエルドリブを形成した壁２０２の肉厚
と略等しく、かつ、その先端溶着部の圧縮肉厚を、両壁
２０１，２０２の肉厚を加えた厚さの略半分からやや小
さい範囲に形成したもの（実開平２−４８３２１号公報
参照）。(B) As shown in FIG. 6 (B), a hollow double-walled structure is formed by blowing a thermoplastic material, and a part of the melted parison is compressed during blow molding. To form a weld rib 203 for integrally connecting the double walls. The weld rib 203 has an inner width of the projecting tip portion substantially equal to the thickness of the wall 202 on which the weld rib is formed, and a welded tip portion of the weld rib. The compression thickness is formed in a range slightly smaller than approximately half the thickness of the two walls 201 and 202 (see Japanese Utility Model Laid-Open No. 2-48321).
【０００５】[0005]
【発明が解決しようとする課題】上記従来の技術のうち
（イ）は、成形の際に、補強板に極端な薄肉部が発生し
たり破断部分が生じ易く剛性に欠けるきらいがある。特
に、二重壁間の広い中空二重壁構造体は、その問題が顕
著に発生する。これを避けるために補強板の肉厚を厚く
すると、成形後の収縮のため左右両面板の前記補強板が
結合された部位の外面にひけやそりが発生して外観が悪
くなるという問題点がある。Among the above-mentioned prior arts, the method (A) is liable to have an extremely thin portion or a ruptured portion in the reinforcing plate at the time of molding, and lack rigidity. In particular, a wide hollow double-wall structure between the double walls causes the problem to be prominent. When the thickness of the reinforcing plate is increased in order to avoid this, shrinkage after molding causes sink marks and warpage on the outer surfaces of the portions where the reinforcing plates are joined on the left and right double-sided plates. is there.
【０００６】また、（ロ）は上述の如く、成形の際のリ
ブ形成工程における圧縮条件が非常に厳しく、該圧縮条
件を一定に設定することが困難なため、作業者の熟練の
度合いが生産性向上に大きく影響する。加えて、前記各
リブは点在的であるため、剛性の向上に限界があるとい
う未解決の課題がある。Further, (b), as described above, the compression conditions in the rib forming step during molding are very severe, and it is difficult to set the compression conditions to a constant level. It greatly affects the improvement of the performance. In addition, since the ribs are scattered, there is an unsolved problem that the improvement in rigidity is limited.
【０００７】本願発明は、上記従来の技術の有する未解
決の課題に鑑みてなされたものであって、成形の際に、
リブに薄肉部や破断部分が発生することがなく、しか
も、剛性等の機械的強度が大きく外観も良好なブロー成
形製二重壁構造体およびその製造方法を実現することを
目的とする。The present invention has been made in view of the above-mentioned unresolved problems of the prior art,
It is an object of the present invention to provide a blow-molded double-walled structure in which a rib does not have a thin portion or a broken portion, has high mechanical strength such as rigidity, and has a good appearance, and a method for manufacturing the same.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するた
め、本願のブロー成形製二重壁構造体は、熱可塑性樹脂
材料をブロー成形することにより製造した互に対向する
一方の壁と他方の壁とを有する中空の二重壁構造体であ
って、前記一方の壁と前記他方の壁とが、パリスンの前
記一方の壁となる部分の一部を前記他方の壁となる部分
に向けて突出変形させて形成されたリブにより一体に接
合されており、前記リブは、前記一方の壁の一部を凹状
に形成してなる凹状リブと該凹状リブの頂面と前記他方
の壁との間の板状の中実リブとからなり、かつ前記中実
リブが前記他方の壁に外側から見えないように溶着され
たものであることを特徴とするものである。In order to achieve the above object, a blow-molded double-walled structure of the present invention comprises one wall facing each other manufactured by blow-molding a thermoplastic resin material and the other wall. A hollow double-walled structure having a wall, wherein the one wall and the other wall are in front of a paris
A part of the part to be one wall is a part to be the other wall.
The ribs are integrally joined by a rib formed by projecting and deforming the rib, the rib is a concave rib formed by forming a part of the one wall in a concave shape, a top surface of the concave rib , and the other of the other rib. A plate-shaped solid rib between the wall and said solid rib.
The rib is welded to the other wall so as not to be seen from the outside .
【０００９】また、本願のブロー成形製二重壁構造体の
製造方法は、一方の金型が凹状リブ形成用の突出部およ
び前記突出部にスライド自在に配設された板状のスライ
ド部を備える一対の金型を使用し、型開きした前記金型
間にパリスンを押出したのち型閉じして、前記パリスン
の一方の壁となる部分の一部を他方の壁となる部分に向
けて突出変形させ、ついで、前記スライド部を前記パリ
スンの他方の壁となる部分に向けて突出させることによ
り、前記突出変形させた部分の先端部をパリスンの他方
の壁となる部分に当接して溶着部を形成したのち、前記
スライド部を引込めたのち前記パリスン内へ加圧流体を
導入して膨張させて金型キャビティの形状に成形すると
同時に、前記一方の壁の一部が凹状に形成された凹状リ
ブと、該凹状リブの頂面と前記他方の壁に形成された前
記溶着部との間に外側から見えないように板状の中実リ
ブを一体に形成することを特徴とするものである。[0009] The manufacturing method of blow molding made double wall structure of the present application, Oyo one mold protrusion for recessed ribs formed
And a plate-shaped slide slidably disposed on the protrusion.
Using a pair of molds having a mold part , the mold is closed after extruding a parison between the molds opened, and a part of a part to be one wall of the paris is formed into a part to be the other wall. And then slide the slide part into the Paris
By protruding toward the other wall of the sun
Ri, after forming the welded portion in contact with the front end portion of the portion is the projecting deformed part to be the other wall of Parisun, the
After the slide portion is retracted, a pressurized fluid is introduced into the parison and expanded to form the shape of the mold cavity, and at the same time, a concave rib in which a part of the one wall is formed in a concave shape, it is characterized in that integrally formed solid ribs in the plate so as not to be visible from the outside between the front <br/> Symbol welded portion formed on the top surface and the other wall of the rib .
【００１０】[0010]
【作用】リブが凹状リブと板状の中実リブとから構成さ
れているため、両者の相乗効果によって剛性が大とな
る。また、板状の中実リブの高さが低いので、成形時に
おける収縮の影響が現われず、板状の中実リブが結合し
た部位の他方の壁の表面にひけやそりが発生しない。Since the ribs are composed of concave ribs and solid ribs, rigidity is increased by a synergistic effect of the two. In addition, since the height of the plate-shaped solid rib is low, the influence of shrinkage during molding does not appear, and sink and warpage do not occur on the surface of the other wall at the portion where the plate-shaped solid rib is joined.
【００１１】[0011]
【実施例】実施例を図面に基いて説明する。An embodiment will be described with reference to the drawings.
【００１２】先ず、本願のブロー成形製二重壁構造体の
一実施例について、図１および図２を参照しつつ説明す
る。First, an embodiment of the blow-molded double wall structure of the present invention will be described with reference to FIGS. 1 and 2. FIG.
【００１３】図１は本実施例のブロー成形製二重壁構造
体を適用したキャビネットの斜視図、図２は本実施例の
ブロー成形製二重壁構造体の一部を破断して示す斜視図
である。FIG. 1 is a perspective view of a cabinet to which the blow-molded double-walled structure of the present embodiment is applied, and FIG. 2 is a perspective view showing a part of the blow-molded double-walled structure of the present embodiment. FIG.
【００１４】本実施例のブロー成形製二重壁構造体２
は、図２に示すように、ブロー成形で一体に成形された
互に対向する一方の壁３および他方の壁４とを有し、周
端面が閉塞された中空の二重壁構造体であって、一方の
壁３と他方の壁４とが互に間隔をおいて形成された平行
に伸びる２本のリブにより一体に接合されており、前記
リブはぞれぞれ、一方の壁３の一部を凹状に形成した凹
状リブ５と、凹状リブ５の頂面と他方の壁４との間に外
側から見えないように形成された板状の中実リブ６とか
らなるものであって、他方の壁４の外面には微小凹凸が
形成されている。Blow-molded double-wall structure 2 of this embodiment
As shown in FIG. 2, is a hollow double-walled structure having one wall 3 and the other wall 4 facing each other integrally formed by blow molding and having a closed peripheral end surface. The one wall 3 and the other wall 4 are integrally joined by two ribs extending parallel to each other and formed at a distance from each other, and the ribs are respectively connected to the one wall 3. A concave rib 5 partially formed in a concave shape, and an outer wall between the top surface of the concave rib 5 and the other wall 4.
Or a solid rib 6 in the formed plate to be invisible from the side
A is Ranaru things, on the outer surface of the other wall 4 is formed with fine irregularities.
【００１５】以上説明したように、一方の壁３と他方の
壁４間は、凹状リブ５および板状の中実リブ６からなる
前記リブの長手方向全域にわたり、結合されているので
剛性等の機械的強度が向上する。As described above, the space between the one wall 3 and the other wall 4 is connected over the entire lengthwise direction of the ribs composed of the concave ribs 5 and the plate-shaped solid ribs 6, so that rigidity and the like are reduced. The mechanical strength is improved.
【００１６】なお、本実施例ではリブの数を２本とした
が、その数は必要に応じ適宜本数とすることができる。In this embodiment, the number of ribs is two, but the number can be appropriately set as required.
【００１７】次に、図２に示す実施例のブロー成形製二
重壁構造体の製造方法について図３乃至図５を参照しつ
つ説明する。Next, a method of manufacturing the blow molded double wall structure of the embodiment shown in FIG. 2 will be described with reference to FIGS.
【００１８】使用する金型は、図３および図４に示すよ
うに、一方の金型７Ｂが互に間隔をおいて設けられた平
行に伸びる２個の凹状リブ形成用の断面が台形状の突出
部１０を備え、各突出部１０の内部にはスライド自在な
板状のスライド部１１がそれぞれ配設されており、他方
の金型７Ａのキャビティ面は微小凹凸が形成されてい
る。As shown in FIGS. 3 and 4, one mold 7B has a trapezoidal cross section for forming two parallel extending concave ribs provided at an interval from each other. Each of the protrusions 10 is provided with a slidable plate-like slide portion 11 provided inside each of the protrusions 10. The cavity surface of the other mold 7A is formed with minute irregularities.
【００１９】先ず、図３に示すように上述の金型を型開
きし、金型７Ａ，７Ｂ間に図示しない押出機の押出ヘッ
ド８より溶融したパリスン９を押出したのち型閉じし
て、前記パリスンの一方の壁となる部分の一部を他方の
壁となる部分に向けて突出変形させる。First, as shown in FIG. 3, the above-mentioned mold is opened, and a melted parison 9 is extruded from an extrusion head 8 of an extruder (not shown) between the molds 7A and 7B, and then the mold is closed. A part of the part to be one wall of the paris is projected and deformed toward the part to be the other wall.
【００２０】ついで、各スライド部１１をパリスンの他
方の壁となる部分に向けて図４の一点鎖線で示す位置へ
突出させることにより前記突出変形されたパリスンの一
方の壁となる部分の先端部を他方の壁となる部分に当接
させて溶着部を形成する。Then, each of the slide portions 11 is projected toward the other wall portion of the parison to a position shown by a dashed line in FIG. 4, whereby the tip of the one wall portion of the projectingly deformed parison is formed. Is brought into contact with the other wall to form a welded portion.
【００２１】そののち、図４の実線で示す位置へ各スラ
イド部１１を引込めたのち、前記パリスン９に吹込針
（図示せず）を突き刺して加圧流体を導入して、図５に
示すようにパリスン９を膨張させることにより金型キャ
ビティの形状に成形すると同時に、前記一方の壁の一部
が凹状に形成された凹状リブ５と、該凹状リブ５と前記
他方の壁に形成された前記溶着部との間のパリスンを溶
着して板状の中実リブ６を外側から見えないように一体
に形成する。このとき、他方の金型７Ａのキャビティ面
の微小凹凸により他方の壁４の外面に微小凹凸が形成さ
れる。After that, after each slide portion 11 is retracted to the position shown by the solid line in FIG. 4, a pressurized fluid is introduced by piercing the above-mentioned parison 9 with a blowing needle (not shown), as shown in FIG. As described above, the parison 9 is formed into the shape of the mold cavity by expanding the same, and at the same time, the concave rib 5 in which a part of the one wall is formed in a concave shape , and the concave rib 5 and the concave rib 5 are formed in the other wall. The parison between the welded portions is welded to form the plate-shaped solid rib 6 integrally so as not to be seen from the outside . At this time, minute irregularities are formed on the outer surface of the other wall 4 due to minute irregularities on the cavity surface of the other mold 7A.
【００２２】前記微小凹凸は必ずしも設ける必要はない
が、上述の如く微小凹凸を設けた場合であっても、収縮
やそりの発生がないので、他方の壁４の前記中実リブ６
との溶着部の形成された部位外面にも他の外面と同様の
微小凹凸が形成され、外観が良好となる。Although it is not always necessary to provide the fine unevenness, even if the fine unevenness is provided as described above, since there is no shrinkage or warpage, the solid rib 6 on the other wall 4 is not formed.
Fine irregularities similar to those on the other outer surfaces are also formed on the outer surface of the portion where the welded portion is formed, and the appearance is improved.
【００２３】[0023]
【発明の効果】本発明は、上述のとおり構成されている
ので、以下に記載するような効果を奏する。Since the present invention is configured as described above, the following effects can be obtained.
【００２４】一方の壁と他方の壁とが凹状リブと板状の
中実リブからなるリブにより、リブの長手方向全域で結
合されているため剛性が大となる。The one wall and the other wall are joined by the ribs composed of the concave ribs and the plate-like solid ribs in the entire longitudinal direction of the ribs, so that the rigidity is increased.
【００２５】また、他方の壁の中実リブが溶着されてい
る部位の外面にひけやそりが発生せず、外観が良好とな
る。Further, without shrinkage or warpage occurs in the outer surface of the portion in which the actual rib in the other wall are welded, the appearance becomes good.
【図１】本発明の一実施例のブロー成形製二重壁構造体
を適用したキャビネットの斜視図である。FIG. 1 is a perspective view of a cabinet to which a blow-molded double-wall structure according to one embodiment of the present invention is applied.
【図２】本発明の一実施例のブロー成形製二重壁構造体
の一部を破断して示す斜視図である。FIG. 2 is a partially cutaway perspective view showing a blow-molded double-wall structure according to an embodiment of the present invention.
【図３】図２に示す実施例のブロー成形製二重壁構造体
の製造方法の一工程であって、型開きした金型間にパリ
スンを押出した状態を示す正面図である。FIG. 3 is a front view showing one step of the method of manufacturing the blow-molded double-walled structure of the embodiment shown in FIG. 2, in which a parison is extruded between the opened molds.
【図４】図３に示す工程についで、スライド部の動作を
示す要部断面図である。FIG. 4 is a cross-sectional view of a main part showing an operation of a slide unit after the step shown in FIG. 3;
【図５】図４に示す工程についで、パリスンを膨張させ
て金型キャビティの形状に成形すると同時に凹状リブお
よび中実リブを形成する工程を示す要部断面図である。5 is a fragmentary cross-sectional view showing a step of forming a concave rib and a solid rib at the same time as expanding the parison into a mold cavity shape following the step shown in FIG. 4;
【図６】従来例を示し、（Ａ）は第１の従来例を示す要
部断面斜視図、（Ｂ）は第２の従来例を示す要部断面斜
視図である。6A and 6B show a conventional example, in which FIG. 6A is a cross-sectional perspective view of a main part showing a first conventional example, and FIG. 6B is a cross-sectional perspective view of a main part showing a second conventional example.
１ キャビネット ２ ブロー成形製二重壁構造体 ３ 一方の壁 ４ 他方の壁 ５ 凹状リブ ６ 中実リブ ７Ａ，７Ｂ 金型 ８ 押出ヘッド ９ パリスン １０ 突出部 １１ スライド部 DESCRIPTION OF SYMBOLS 1 Cabinet 2 Blow molding double wall structure 3 One wall 4 The other wall 5 Concave rib 6 Solid rib 7A, 7B Mold 8 Extrusion head 9 Parison 10 Projection part 11 Slide part
Claims (2)
により製造した互に対向する一方の壁と他方の壁とを有
する中空の二重壁構造体であって、 前記一方の壁と前記他方の壁とが、パリスンの前記一方
の壁となる部分の一部を前記他方の壁となる部分に向け
て突出変形させて形成されたリブにより一体に接合され
ており、前記リブは、前記一方の壁の一部を凹状に形成
してなる凹状リブと該凹状リブの頂面と前記他方の壁と
の間の板状の中実リブとからなり、かつ前記中実リブが
前記他方の壁に外側から見えないように溶着されたもの
であることを特徴とするブロー成形製二重壁構造体。1. A hollow double-walled structure having a one wall and the other walls mutually opposed prepared by the thermoplastic resin material to blow molding, wherein the one wall and the other The wall and the one of Parison
Part of the wall that is to face the other wall
Are joined together by a rib formed by protruding deformed Te, the ribs, the top surface of the concave ribs and the concave ribs by forming a part of said one wall concave and said other wall Between a plate-shaped solid rib and the solid rib
A blow molded double wall structure, which is welded to the other wall so as not to be seen from the outside .
よび前記突出部にスライド自在に配設された板状のスラ
イド部を備える一対の金型を使用し、型開きした前記金
型間にパリスンを押出したのち型閉じして、前記パリス
ンの一方の壁となる部分の一部を他方の壁となる部分に
向けて突出変形させ、ついで、前記スライド部を前記パ
リスンの他方の壁となる部分に向けて突出させることに
より、前記突出変形させた部分の先端部をパリスンの他
方の壁となる部分に当接して溶着部を形成したのち、前
記スライド部を引込めたのち前記パリスン内へ加圧流体
を導入して膨張させて金型キャビティの形状に成形する
と同時に、前記一方の壁の一部が凹状に形成された凹状
リブと、該凹状リブの頂面と前記他方の壁に形成された
前記溶着部との間に外側から見えないように板状の中実
リブを一体に形成することを特徴とするブロー成形製二
重壁構造体の製造方法。2. A mold according to claim 1, wherein one of the molds has a protrusion for forming a concave rib .
And a plate-shaped slurry slidably disposed on the protrusion.
Using a pair of molds provided with an id portion , the mold is closed after extruding a parison between the opened molds, and a part of a part to be one wall of the paris is formed into a part to be the other wall. The slide part is then deformed toward the
Projecting towards the other wall of the listen
More, after forming the welded portion in contact with the front end portion of the portion is the projecting deformed portions serving as the other of the walls of Parisun, before
After the slide portion is retracted, a pressurized fluid is introduced into the parison and expanded to form a mold cavity, and at the same time, a concave rib in which a part of the one wall is formed in a concave shape , made blow molding and forming integrally the real ribs in a plate shape so as not to be visible from the outside between <br/> the weld portion formed on the other wall and the top surface of the concave ribs A method for manufacturing a double wall structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08982392A JP3236656B2 (en) | 1992-03-13 | 1992-03-13 | Blow-molded double-wall structure and method of manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08982392A JP3236656B2 (en) | 1992-03-13 | 1992-03-13 | Blow-molded double-wall structure and method of manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05254002A JPH05254002A (en) | 1993-10-05 |
| JP3236656B2 true JP3236656B2 (en) | 2001-12-10 |
Family
ID=13981481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08982392A Expired - Fee Related JP3236656B2 (en) | 1992-03-13 | 1992-03-13 | Blow-molded double-wall structure and method of manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3236656B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008137247A (en) * | 2006-11-30 | 2008-06-19 | Kyoraku Co Ltd | Rib structure of resin made hollow double wall structure |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4520574B2 (en) * | 2000-03-16 | 2010-08-04 | キョーラク株式会社 | Hollow double wall structure and blow molding die thereof |
-
1992
- 1992-03-13 JP JP08982392A patent/JP3236656B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008137247A (en) * | 2006-11-30 | 2008-06-19 | Kyoraku Co Ltd | Rib structure of resin made hollow double wall structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05254002A (en) | 1993-10-05 |
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