JP3344440B2 - Blow-molded hollow double-walled molded product and method for producing the same - Google Patents

Blow-molded hollow double-walled molded product and method for producing the same

Info

Publication number
JP3344440B2
JP3344440B2 JP02626194A JP2626194A JP3344440B2 JP 3344440 B2 JP3344440 B2 JP 3344440B2 JP 02626194 A JP02626194 A JP 02626194A JP 2626194 A JP2626194 A JP 2626194A JP 3344440 B2 JP3344440 B2 JP 3344440B2
Authority
JP
Japan
Prior art keywords
wall
rib
ribs
hollow double
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
Application number
JP02626194A
Other languages
Japanese (ja)
Other versions
JPH07214643A (en
Inventor
英夫 鈴木
治弘 遠藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyoraku Co Ltd
Original Assignee
Kyoraku Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kyoraku Co Ltd filed Critical Kyoraku Co Ltd
Priority to JP02626194A priority Critical patent/JP3344440B2/en
Publication of JPH07214643A publication Critical patent/JPH07214643A/en
Application granted granted Critical
Publication of JP3344440B2 publication Critical patent/JP3344440B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【産業上の利用分野】本発明は、間隔をおいて対向する
一方の壁と他方の壁を備え、両者の間に一体に設けられ
た補強用のリブを有するブロー成形製中空二重壁成形品
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 hollow double-walled molding having one wall and the other wall opposed to each other at a distance, and a reinforcing rib provided integrally between the two walls. The present invention relates to a product and a method for manufacturing the same.

【０００２】[0002]

【従来の技術】従来、この種のブロー成形製中空二重壁
成形品およびその製造方法としては、図６の（ａ）に示
すように、型開きした分割型式の金型１０１，１０２間
に溶融したパリスン１０５を配置したのち型閉じし、対
向して設けられた摺動板１０３，１０４をキャビティ内
へ突出させることによってパリスン１０５にその両側か
ら内方へ突出する凹部を形成して該凹部の先端部を融着
させ、ついで、図６の（ｂ）に示すように前記摺動板１
０３，１０４を引き込ませたのち、前記パリスン１０５
内に空気を吹込んで前記キャビティに沿って膨張させる
とともに前記凹部を内圧Ｐによって板状に圧着して、図
６の（ｃ）に示すような、間隔をおいて対向する面板１
０６の内側に一体成形された補強リブ１０７を有するボ
ード１０８を得る方法が提案されている（特開平１−２
０４８７１号公報参照）。2. Description of the Related Art Conventionally, a blow-molded hollow double-walled molded product of this type and a method of manufacturing the same are, as shown in FIG. After disposing the melted paris 105, the mold is closed, and the sliding plates 103 and 104 provided oppositely are protruded into the cavity, thereby forming a concave in the paris 105 protruding inward from both sides thereof. Of the sliding plate 1 as shown in FIG. 6 (b).
03, 104, the paris 105
Air is blown into the cavity to expand along the cavity, and the concave portion is pressed into a plate shape by the internal pressure P, so that the facing face plate 1 is spaced apart as shown in FIG.
A method for obtaining a board 108 having a reinforcing rib 107 integrally formed inside the inside of the inner casing 06 has been proposed (Japanese Unexamined Patent Publication No. Hei 1-2).
04871).

【０００３】[0003]

【発明が解決しようとする課題】上記従来の技術は、間
隔をおいて対向する面板が平坦面のみからなるボードに
補強リブを一体成形することができるものの、後述する
本発明に係る、間隔をおいて対向する一方の壁および他
方の壁の少なくとも片方の壁に設けられた凹凸部によっ
て形成された少なくとも一個の段差部を有するブロー成
形製中空二重壁成形品の場合、一方の壁の内面と他方の
壁の内面の間隔が前記凹凸部によって形成された段差部
において段階的に変化するために、該段差部と交差する
方向に延在する補強リブを連続して形成することができ
ない。その結果、補強リブの切れ目が発生することは避
けられず、この補強リブの切れ目の部分において剛性等
の機械的強度が低下するという問題点があった。According to the above-mentioned prior art, the reinforcing ribs can be integrally formed on a board whose facing face plate has only a flat surface at an interval. In the case of a blow-molded hollow double-walled molded product having at least one step formed by uneven portions provided on at least one of the opposed one wall and the other wall, the inner surface of one wall Since the distance between the inner surface of the second wall and the other wall changes stepwise in the step formed by the uneven portion, the reinforcing rib extending in the direction intersecting the step cannot be formed continuously. As a result, it is inevitable that a break in the reinforcing rib occurs, and there is a problem that mechanical strength such as rigidity is reduced at the cut portion of the reinforcing rib.

【０００４】本発明は、上記従来の技術の有する問題点
に鑑みてなされたものであって、剛性等の機械的強度が
大きな、間隔をおいて対向する一方の壁および他方の壁
の少なくともいずれか片方の壁に設けられた凹凸部によ
って形成された少なくとも一個の段差部を有するブロー
成形製中空二重壁成形品およびその製造方法を実現する
ことを目的とするものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has at least one of one wall and the other wall facing each other with a large mechanical strength such as rigidity. An object of the present invention is to realize a blow-molded hollow double-walled molded product having at least one step formed by uneven portions provided on one of the walls and a method for manufacturing the same.

【０００５】[0005]

【課題を解決するための手段】上記の目的を達成するた
め、本発明に係るブロー成形製中空二重壁成形品は、間
隔をおいて対向する一方の壁と他方の壁とを備え、前記
一方の壁と他方の壁の少なくともいずれか片方の壁に設
けられた凹凸部によって形成された少なくとも一個の段
差部を有する熱可塑性樹脂からなるブロー成形製中空二
重壁成形品であって、前記一方の壁と他方の壁との間に
は、前記段差部の部位に成形された介在リブによって互
に溶着連結された一連のリブが一体成形されており、し
かも前記一連のリブは前記段差部に対して交差する方向
に延在することを特徴とするものである。In order to achieve the above object, a blow molded hollow double wall molded product according to the present invention comprises one wall and the other wall facing each other at an interval, and A blow molded hollow double-walled molded article made of a thermoplastic resin having at least one step formed by uneven portions provided on at least one of the one wall and the other wall, Between the one wall and the other wall, a series of ribs which are welded and connected to each other by an intervening rib formed at the position of the step portion are integrally formed, and the series of ribs are formed by the step portion. , And extends in a direction intersecting with.

【０００６】また、介在リブによって互に溶着連結され
た一連のリブが、一方の壁と他方の壁間に内在する板状
のインナーリブと他方の壁の一部を凹状に形成してなる
凹状リブとからなるものとしたり、インナーリブが一方
の壁と他方の壁の対向する平坦面の部位に設けられてお
り、凹状リブが一方の壁と他方の壁の少なくともいずれ
か片方の壁の凹凸部が形成された部位に設けられたもの
にすると効果的である。A series of ribs welded and connected to each other by interposed ribs form a plate-shaped inner rib between one wall and the other wall and a concave shape formed by forming a part of the other wall into a concave shape. Or an inner rib is provided on a portion of a flat surface facing one wall and the other wall, and a concave rib is provided on at least one of the one wall and the other wall. It is effective to provide the portion provided with the portion.

【０００７】本発明のブロー成形製中空二重壁成形品の
製造方法は、間隔をおいて対向する一方の壁と他方の壁
とを備え、前記一方の壁と他方の壁の少なくともいずれ
か片方の壁に設けられた凹凸部によって形成された少な
くとも一個の段差部を有する熱可塑性樹脂からなるブロ
ー成形製中空二重壁成形品の製造方法であって、前記一
方の壁と他方の壁の外面を規制するとともに両者のうち
の少なくとも片方の壁に前記凹凸部を形成する形状のキ
ャビティを有する分割型式の金型を用い、型開きした前
記金型間に溶融したパリスンを配置して型閉じし、つい
で前記パリスンの他方の壁となる部分を、前記段差部の
部位に介在リブを成形するための間隙部をおいて個別に
前記パリスンの一方の壁となる部分に向けて前記段差部
に交差する方向の筋状に変形させて筋状凹部を形成して
その先端部を前記パリスンの一方の壁となる部分に溶着
させたのち、前記パリスン内に加圧流体を導入して前記
キャビティに沿って膨張させるとともに前記各筋状凹部
を前記加圧流体の内圧によって変形させることによっ
て、前記間隙部によって成形される介在リブによって互
に溶着連結され、しかも前記段差部に対して交差する方
向に延在する一連のリブを一体成形することを特徴とす
るものである。A method for manufacturing a blow molded hollow double-walled product according to the present invention includes one wall and the other wall facing each other at an interval, and at least one of the one wall and the other wall. A method of manufacturing a blow molded hollow double-walled molded product made of a thermoplastic resin having at least one step formed by an uneven portion provided on a wall of the one wall and the outer surface of the other wall Using a divided mold having a cavity having a shape to form the uneven portion on at least one of the walls, and disposing a molten parison between the opened molds and closing the mold. Then, the part to be the other wall of the paris intersects with the step part individually toward the part to be one wall of the paris with a gap part for forming an intervening rib at the part of the step part. In the direction of After forming a streak-shaped recess by deforming it into a shape and welding its tip to a portion to be one wall of the parison, a pressurized fluid is introduced into the parison and expanded along the cavity. By deforming each of the streak-shaped concave portions by the internal pressure of the pressurized fluid, a series of welds are connected to each other by interposed ribs formed by the gap portions, and extend in a direction intersecting the step portion. The ribs are integrally formed.

【０００８】また、間隔をおいて対向する一方の壁と他
方の壁とを備え、前記一方の壁と他方の壁の少なくとも
いずれか片方の壁に設けられた凹凸部によって形成され
た少なくとも一個の段差部を有する熱可塑性樹脂からな
るブロー成形製中空二重壁成形品の製造方法であって、
前記一方の壁と他方の壁の外面を規制するとともに両者
のうちの少なくとも片方の壁に前記凹凸部を形成する形
状のキャビティを有する分割型式の金型を用い、型開き
した前記金型間に溶融したパリスンを配置して型閉じ
し、ついで前記パリスンの他方の壁となる部分を、前記
段差部の部位に介在リブを成形するための間隙部をおい
て個別に進退可能な前記段差部に交差する方向の板状の
スライド部材を前記キャビティ内へ突き出すことによっ
てそれぞれ筋状に変形させて筋状凹部を形成してその先
端部を前記パリスンの一方の壁となる部分に溶着させた
のち、前記板状のスライド部材のうちの少なくとも一つ
を引き込ませたのち、前記パリスン内に加圧流体を導入
して前記キャビティに沿って膨張させるとともに前記各
筋状凹部を前記加圧流体の内圧によって変形させること
によって、前記間隙部によって成形される介在リブによ
って互に溶着連結された一方の壁と他方の壁間に内在す
る板状のインナーリブと他方の壁の一部を凹状に形成し
てなる凹状リブからなり、しかも前記段差部に対して交
差する方向に延在する一連のリブを一体成形することを
特徴とするものである。[0008] Further, there is provided one wall and the other wall opposed to each other at an interval, and at least one wall formed by the uneven portion provided on at least one of the one wall and the other wall. A method for producing a blow molded hollow double-walled molded product made of a thermoplastic resin having a step portion,
Using a split mold having a cavity shaped to form the uneven portion on at least one of the walls while regulating the outer surfaces of the one wall and the other wall, between the opened molds The melted parison is arranged and the mold is closed, and then the other wall of the paris is formed into the step portion which can be individually advanced and retracted with a gap portion for forming an interposed rib at the portion of the step portion. After projecting a plate-shaped slide member in the direction of crossing into the cavity to deform it into a streak shape to form a streak-shaped recess, and welding the tip end thereof to a portion to be one wall of the paris, After at least one of the plate-shaped slide members is retracted, a pressurized fluid is introduced into the parison to expand along the cavity and press the respective streaked recesses. By deforming due to the internal pressure of the body, a plate-shaped inner rib present between one wall and the other wall and a part of the other wall are welded and connected to each other by an intervening rib formed by the gap. And a series of ribs extending in a direction intersecting with the step portion are integrally formed.

【０００９】[0009]

【作用】一方の壁と他方の壁との間には、段差部の部位
に成形された介在リブによって互に溶着連結された一連
のリブが一体成形されており、しかも前記一連のリブは
前記段差部に対して交差する方向に延在して切れ目が無
いため、ブロー成形製中空二重壁成形品の剛性等の機械
的強度が大きくなる。A series of ribs are integrally formed between one wall and the other wall and are welded and connected to each other by an intervening rib formed at a step portion. Since there is no discontinuity extending in the direction intersecting the step, the mechanical strength such as the rigidity of the blow molded hollow double wall molded product is increased.

【００１０】[0010]

【実施例】図１は、本発明に係るブロー成形製中空二重
壁成形品を天板に用いたワゴンの斜視図である。FIG. 1 is a perspective view of a wagon using a blow molded hollow double wall molded product according to the present invention as a top plate.

【００１１】天板１の上面には、後方から前方（図示左
側から右側）にかけて順次コンセント６等が付設される
後方***部２ａと、該後方***部２ａ、縁部２ｃ、およ
び仕切部２ｄとに囲まれた平坦面である主載置面２ｂ
と、仕切部２ｄと縁部２ｃの前方部とに囲まれた平坦面
である前方載置面２ｅが形成されており、該前方載置面
２ｅにはコップ置部２ｆが形成されている。また、天板
１の裏面３ｃの後方側と前方側の端部近傍にはそれぞれ
後方フレーム用溝３ａおよび前方フレーム用溝３ｂが形
成されている。On the upper surface of the top plate 1, a rear protruding portion 2a to which an outlet 6 and the like are sequentially provided from the rear to the front (from left to right in the figure), the rear protruding portion 2a, the edge portion 2c, and the partition portion 2d are provided. Main mounting surface 2b which is a flat surface surrounded by
And a front mounting surface 2e which is a flat surface surrounded by the partitioning portion 2d and the front portion of the edge 2c, and a cup mounting portion 2f is formed on the front mounting surface 2e. A groove 3a for the rear frame and a groove 3b for the front frame are formed near the rear and front ends of the back surface 3c of the top plate 1, respectively.

【００１２】天板１の裏面３ｃに形成された後方フレー
ム用溝３ａに枠状の後方フレーム５ａの上辺部を嵌合す
るとともに、前方フレーム用溝３ｂに枠状の前方フレー
ム５ｂの上辺部を嵌合してワゴン本体を構成し、天板１
と両フレーム５ａ，５ｂに囲まれた空間部に３個の引出
し４を上下方向に積重ねた状態に配設することによって
ワゴン７が構成されている。The upper edge of the frame-shaped rear frame 5a is fitted into the groove 3a for the rear frame formed on the back surface 3c of the top plate 1, and the upper edge of the frame-shaped front frame 5b is fitted into the groove 3b for the front frame. The wagon body is configured by fitting
The wagon 7 is configured by arranging three drawers 4 in a vertically stacked state in a space surrounded by the two frames 5a and 5b.

【００１３】次に本発明に係るブロー成形製中空二重壁
成形品の一実施例を図１に示す天板を例に挙げて説明す
る。Next, an embodiment of a blow molded hollow double wall molded product according to the present invention will be described with reference to a top plate shown in FIG.

【００１４】本実施例のブロー成形製中空二重壁成形品
は、熱可塑性樹脂をブロー成形することによって一体成
形されたものであって、図２および図３に示すように、
間隔をおいて対向する一方の壁１１と他方の壁１２とを
有し、その周面が端壁１３によって閉塞された中空二重
壁構造体であって、一方の壁１１は、図１に示す天板１
の後方***部２ａ、主載置面２ｂ、縁部２ｃ、仕切部２
ｄ、前方載置面２ｅおよびコップ置部２ｆにそれぞれ対
応して、第１の凸部１１ａ、第１の平坦面１１ｂ、第２
の凸部１１ｃ、第３の凸部１１ｄ、第２の平坦面１１ｅ
および第１の凹部１１ｆからなり、他方の壁１２は、図
１に示す天板の後方フレーム用溝３ａ、裏面３ｃ、前方
フレーム用溝３ｂにそれぞれ対応する第２の凹部１２
ａ、第３の平坦面１２ｄ、第３の凹部１２ｃおよび引出
し４を引出した際に引出し４の後壁と当接する図１には
不図示の抜け止め用の凸部を構成する第４の凸部１２ｂ
が形成され、しかも一方の壁１１の第１の平坦面１１ｂ
の部分とこれと対向する他方の壁１２の第３の平坦面１
２ｄとの間には、これらと一体成形されて内在する板状
のインナーリブ１４がほぼ平行に２本設けられていると
ともに、前記２本のインナーリブ１４のそれぞれの両端
はそれぞれ段差部１７ａ，１７ｂの部位にそれぞれ成形
された介在リブ１６ａ，１６ｂの一端に溶着連結され、
各介在リブ１６ａ，１６ｂの他端は各インナーリブ１４
の延長線上に沿ってそれぞれ延在する一体成形された凹
状リブ１５ａ，１５ｂの一端に溶着連結されている。The blow-molded hollow double-walled molded product of the present embodiment is integrally molded by blow-molding a thermoplastic resin. As shown in FIGS. 2 and 3,
It is a hollow double-walled structure having one wall 11 and the other wall 12 facing each other at an interval, and the peripheral surface of which is closed by an end wall 13. Top plate 1 shown
Rear ridge 2a, main mounting surface 2b, edge 2c, partition 2
d, the first projection 11a, the first flat surface 11b, and the second projection corresponding to the front placement surface 2e and the cup placement portion 2f, respectively.
, The third protrusion 11d, and the second flat surface 11e.
And the first recess 11f, and the other wall 12 has a second recess 12 corresponding to the rear frame groove 3a, the rear surface 3c, and the front frame groove 3b of the top plate shown in FIG.
a, a third flat surface 12d, a third concave portion 12c, and a fourth projection which forms a retaining projection (not shown in FIG. 1) which comes into contact with the rear wall of the drawer 4 when the drawer 4 is pulled out. Part 12b
Is formed, and the first flat surface 11b of the one wall 11 is formed.
And the third flat surface 1 of the other wall 12 facing the same
2d, two plate-shaped inner ribs 14 formed integrally therewith are provided substantially in parallel with each other, and both ends of the two inner ribs 14 are stepped portions 17a and 17d, respectively. 17b is welded and connected to one end of each of the interposed ribs 16a and 16b formed at the portion of 17b.
The other end of each of the interposed ribs 16a and 16b is
Are welded and connected to one ends of integrally formed concave ribs 15a and 15b extending along the extension line of.

【００１５】本実施例では、一方の壁１１と他方の壁１
２の間に、外部から見えないように内在する板状のイン
ナーリブ１４と、その両端にそれぞれ介在リブ１６ａ，
１６ｂを介して溶着連結された他方の壁１２の一部を凹
状に形成してなる凹状リブ１５とからなる一連のリブが
一体成形されて切れ目がないため、従来例に比較して剛
性等の機械的強度が大きい。In this embodiment, one wall 11 and the other wall 1
2, a plate-shaped inner rib 14 which is not visible from the outside and interposed ribs 16a,
Since a series of ribs including a concave rib 15 formed by forming a part of the other wall 12 which is welded and connected via the 16b into a concave shape is integrally formed and has no cut, the rigidity and the like are lower than those of the conventional example. High mechanical strength.

【００１６】本実施例において、一方の壁１１に設けた
第１の凸部１１ａと第１の平坦面１１ｂとの境界に一方
の段差部１７ａが形成され、他方の壁１２に設けた第４
の凸部１２ｂと第３の平坦面１２ｄの境界に他方の段差
部１７ｂが形成されている。しかしこれに限らず、成形
品の形状に応じその数は増減され、また、いずれか片方
にのみに段差部が形成される場合にも本発明は適用でき
る。さらに、一連のリブをインナーリブと凹状リブのい
ずれか一方のみからなるものとすることができる。In this embodiment, one step portion 17a is formed at the boundary between the first convex portion 11a provided on one wall 11 and the first flat surface 11b, and the fourth step portion 17a provided on the other wall 12 is formed.
The other step 17b is formed at the boundary between the convex portion 12b and the third flat surface 12d. However, the present invention is not limited to this, and the number may be increased or decreased according to the shape of the molded product, and the present invention can be applied to a case where a step is formed on only one of the two. Further, the series of ribs may be formed of only one of the inner rib and the concave rib.

【００１７】一般に中空二重壁成形品の機械的強度を向
上するひとつの手段として、補強リブを構成することが
考えられるが、製品として具体的にどのような強度向上
が必要かは、その要求特性によって異なる。In general, as one means for improving the mechanical strength of a hollow double-walled molded product, it is conceivable to configure a reinforcing rib. Depends on characteristics.

【００１８】本発明にあっては、電気装置や家具などの
ハウジングパネルのように、全体形状がパネル状のブロ
ー成形製中空二重壁成形品に、特にその特性が発揮され
る。In the present invention, the characteristics are particularly exhibited in a blow molded hollow double-walled product having a panel-like overall shape, such as a housing panel of an electric device or furniture.

【００１９】パネル状のブロー成形製中空二重壁成形品
は、要求特性として剛性、特に、耐撓み変形性が問題と
なることが少なくない。A panel-shaped blow-molded hollow double-walled molded product often has a problem in rigidity, particularly resistance to bending deformation, as required characteristics.

【００２０】パネル状のブロー成形製中空二重壁成形品
において、耐撓み変形性の要求される壁部分にあって
は、リブが切れ目なく連続していることが重要であり、
切れ目が存在すると、その箇所のみ断面二次モーメント
が極端に低いことから荷重の作用した際、その箇所より
曲折変形さらには破断を生じる。よって、実施例のよう
に、ブロー成形製中空二重壁成形品の一端から他端に亘
って剛性が必要な場合は、全長に亘って一連のリブを構
成し、ブロー成形製中空二重壁成形品の一端から中央部
に亘って剛性が必要な場合は、一端から中央部に亘って
一連のリブを構成することが必要である。In a panel-shaped blow-molded hollow double-walled molded product, it is important that ribs be continuous without break in a wall portion requiring bending resistance.
If there is a cut, the second moment of area is extremely low only at that location, so that when a load is applied, bending deformation or breakage occurs at that location. Therefore, when rigidity is required from one end to the other end of the blow-molded hollow double-walled product as in the embodiment, a series of ribs are formed over the entire length, and the blow-molded hollow double-walled product is formed. When rigidity is required from one end to the center of the molded product, it is necessary to form a series of ribs from one end to the center.

【００２１】また、撓み変形性の向上にはブロー成形製
中空二重壁成形品の厚み方向に立設した樹脂壁を有する
インナーリブまたは凹状リブが有効であり、なかでもイ
ンナーリブはリブの対向樹脂壁同志を溶着して板状に構
成されているので特に優れる。In order to improve the bending deformation, an inner rib or a concave rib having a resin wall standing upright in the thickness direction of a blow molded hollow double-walled product is effective. In particular, the inner rib is opposed to the rib. It is particularly excellent because it is formed in a plate shape by welding resin walls together.

【００２２】また、中空二重壁を構成する一方の壁と他
方の壁は一連のリブに溶着されている。この一連のリブ
は、その先端すべてを溶着することが好ましいが、特に
限定されるものではなく、製品の用途によっては、リブ
の先端すべてを溶着する必要がないものもあり、要求さ
れる剛性によって適宜設計変更が可能である。Further, one wall and the other wall constituting the hollow double wall are welded to a series of ribs. It is preferable to weld all the tips of the series of ribs, but it is not particularly limited. Depending on the application of the product, it is not necessary to weld all the tips of the ribs. Design changes can be made as appropriate.

【００２３】次に、本発明に係るブロー成形製中空二重
壁成形品の製造方法の一実施例について、図２および図
３に示したブロー成形製中空二重壁成形品を製造する場
合を例に挙げて説明する。Next, with respect to one embodiment of the method for producing a blow molded hollow double wall molded product according to the present invention, the case where the blow molded hollow double wall molded product shown in FIGS. 2 and 3 is produced will be described. This will be described using an example.

【００２４】各工程を説明する前に、本実施例において
使用する分割型式の金型について図４を参照しつつ説明
する。Before describing each step, a split mold used in this embodiment will be described with reference to FIG.

【００２５】一方の金型２１は、図２および図３に示し
た一方の壁１１の外面と端壁１３の約半分の外面を規制
する形状のキャビティ面を有し、他方の金型２２は、他
方の壁１２の外面と端壁１３の残り部分の外面を規制す
る形状のキャビティ面を有する。他方の金型２２のキャ
ビティ面の図２および図３に示した第３の平坦面１２ｄ
を形成するための平坦面形成部２２ａと第４の凸部１２
ｂを形成するための凸部形成部２２ｂとの境界部によっ
て形成される段差部１７ｂと交差する方向に板状のイン
ナーリブ用スライド部材２３と凹状リブ用スライド部材
２４が前記段差部１７ｂが形成される部位に間隙部をお
いて同一線上に併設されており、前記インナーリブ用ス
ライド部材２３と凹状リブ用スライド部材２４はそれぞ
れ流体圧シリンダや電動ボールナット−ネジ機構等の直
線移動手段２５によって駆動されて個別にキャビティ内
へ突き出したり引き込ませたりすることができるように
構成されている。また、インナーリブ用スライド部材２
３の先端面は対向する一方の金型のキャビティ面の形状
にならう形状に、凹状リブ用スライド部材２４の先端面
は対向する一方の金型のキャビティ面の形状にならう形
状にそれぞれ形成されている。One mold 21 has a cavity surface shaped to regulate the outer surface of one wall 11 and about half the outer surface of end wall 13 shown in FIGS. 2 and 3, and the other mold 22 has And a cavity surface shaped to regulate the outer surface of the other wall 12 and the outer surface of the remaining portion of the end wall 13. The third flat surface 12d of the cavity surface of the other mold 22 shown in FIGS. 2 and 3
Flat surface forming portion 22a and fourth convex portion 12 for forming
The plate-shaped inner rib slide member 23 and the concave rib slide member 24 are formed in the direction intersecting the step 17b formed by the boundary with the protrusion forming portion 22b for forming the b. The inner rib slide member 23 and the concave rib slide member 24 are respectively provided by linear moving means 25 such as a fluid pressure cylinder or an electric ball nut-screw mechanism. It is configured to be driven and individually protruded and retracted into the cavity. Also, the inner rib slide member 2
3 has a shape conforming to the shape of the cavity surface of one of the opposed dies, and the tip surface of the concave rib slide member 24 has a shape conforming to the shape of the cavity surface of the one of the opposed dies. Have been.

【００２６】なお、図４には金型の約半分を図示した
が、残りの部分はキャビティ面の形状が異なるのみでそ
の他の部分の構成は図示した部分と同様であるため省略
した。また、次に述べる各工程についても同様に図４に
図示した部分のみについて説明し、図４に図示しない部
分の説明は省略する。Although FIG. 4 shows about a half of the mold, the remaining part is different from that of the part shown in the drawing except that the configuration of the cavity surface is different. Similarly, in each step described below, only the portion illustrated in FIG. 4 will be described, and the description of the portion not illustrated in FIG. 4 will be omitted.

【００２７】図４は本発明に係るブロー成形製中空二重
壁成形品の製造方法の一実施例の各工程を示し、（ａ）
は型閉じ完了直前の状態を示す金型主要部断面図、
（ｂ）はパリスンの他方の壁となる部分を筋状に変形さ
せて各筋状凹部を形成しその先端部のパリスンの一方の
壁となる部分に溶着した状態を示す金型主要部断面図、
（ｃ）は（ｂ）に示す工程ののち加圧流体を導入してパ
リスンを膨張させるとともにインナーリブおよび凹状リ
ブを形成した状態を示す金型主要部断面図である。FIG. 4 shows the steps of one embodiment of the method for producing a blow molded hollow double-walled product according to the present invention, wherein (a)
Is a cross-sectional view of a main part of the mold showing a state immediately before completion of mold closing,
(B) is a sectional view of a main part of a mold showing a state in which the other wall portion of the paris is deformed into a streak shape to form each streak-shaped concave portion and is welded to the one wall portion of the paris at the tip end thereof. ,
(C) is a sectional view of the main part of the mold showing a state where the pressurized fluid is introduced after the step shown in (b) to expand the parison and the inner rib and the concave rib are formed.

【００２８】また、図５は、各スライドコアの動作の説
明図であって、図５の（ａ）乃至（ｆ）はそれぞれ図４
の（ａ）乃至（ｃ）に示すＡ−Ａ線乃至Ｆ−Ｆ線に沿う
模式断面図である。FIG. 5 is an explanatory diagram of the operation of each slide core. FIGS.
3A to 3C are schematic cross-sectional views taken along lines AA to FF shown in FIGS.

【００２９】 図４の（ａ）および図５の（ａ），
（ｄ）に示すように、一方の金型２１と他方の金型２２
を型開きするとともに、インナーリブ用スライド部材２
３、凹状リブ用スライド部材２４を引き込ませておき、
熱可塑性樹脂を図示しない押出機によって溶融させてそ
の押出ヘッドより筒状のパリスン２６を押出して型開き
された前記金型２１，２２間に配置したのち型閉じす
る。このとき、パリスン２６の先端開口部を閉鎖し、前
記押出ヘッドに内設された吹込手段等によって加圧流体
を所定量導入するいわゆるプリブローを行ったのち型閉
じを完了させるとよい。 上記工程ののち、図４の（ｂ）および図５の
（ｂ），（ｅ）に示すように、インナーリブ用スライド
部材２３と凹状リブ用スライド部材２４とをそれぞれの
個別のストロークでキャビティ内に突き出す（矢印方向
へ突き出す）ことによって、パリスン２６の他方の壁と
なる部分を、一方の壁となる部分に向けて段差部１７ｂ
と交差する方向の筋状に変形させてそれぞれ筋状凹部２
６ａ，２６ｂを形成しその先端部をパリスン２６の一方
の壁となる部分に溶着させる。インナーリブ用スライド
部材２３と凹状リブ用スライド部材２４の間の間隙部に
対向するパリスン２６の部位は各筋状凹部２６ａ，２６
ｂが成長するにつれて引き伸ばされて各筋状凹部２６
ａ，２６ｂの対向面側へ移動して行き、次の工程にお
ける介在リブ１６を成形するための部分となる。FIGS. 4A and 5A,
As shown in (d), one mold 21 and the other mold 22
And the inner rib slide member 2
3. The concave rib slide member 24 is retracted,
The thermoplastic resin is melted by an extruder (not shown), the cylindrical parison 26 is extruded from the extrusion head, and is disposed between the opened molds 21 and 22 and then closed. At this time, the opening of the tip end of the parison 26 is closed, so-called pre-blowing for introducing a predetermined amount of pressurized fluid by a blowing means or the like provided inside the extrusion head is performed, and then the mold closing is completed. After the above process, as shown in FIG. 4B and FIGS. 5B and 5E, the inner rib slide member 23 and the concave rib slide member 24 are moved into the cavity by respective individual strokes. Of the paris 26 toward the part to be one wall by protruding (projecting in the direction of the arrow) to the step 17b.
Deformed into streaks in the direction intersecting with
6a and 26b are formed, and the front ends thereof are welded to a portion to be one wall of the parison 26. The portion of the paris 26 facing the gap between the inner rib slide member 23 and the concave rib slide member 24 is formed with the respective streak-shaped concave portions 26a, 26.
b are stretched as they grow and each streak 26
It moves toward the opposing surface side of a and 26b and becomes a portion for forming the intervening rib 16 in the next step.

【００３０】 上記工程ののち、図４の（ｃ）およ
び図５の（ｃ），（ｆ）に示すように、インナーリブ用
スライド部材２３のみを引き込ませ凹状リブ用スライド
部材２４は突き出した状態で、前記パリスン２６に吹込
針等の吹込手段を突き刺して加圧流体を導入してキャビ
ティに沿って膨張させると同時に各筋状凹部２６ａ，２
６ｂを前記加圧流体の内圧により変形させる。これによ
って一方の筋状凹部２６ａは図示両側より圧着されて板
状のインナーリブ１４となり他方の筋状凹部２６ｂは凹
状リブ用スライド部材２４の外面に押し付けられて他方
の壁１２の一部を凹状に形成してなる凹状リブ１５が形
成されるとともに、前記インナーリブ１４と凹状リブ１
５の間には両者に溶着連結された介在リブ１６が成形さ
れる。After the above steps, as shown in FIG. 4C and FIGS. 5C and 5F, only the inner rib slide member 23 is retracted, and the concave rib slide member 24 is projected. Then, a blowing means such as a blowing needle is pierced into the parison 26 to introduce a pressurized fluid and expand along the cavity, and at the same time, each of the stripe-shaped concave portions 26a, 2
6b is deformed by the internal pressure of the pressurized fluid. As a result, one streak-like concave portion 26a is pressed from both sides in the drawing to become a plate-like inner rib 14, and the other streak-like concave portion 26b is pressed against the outer surface of the slide member 24 for the concave rib, so that a part of the other wall 12 becomes concave. And the inner rib 14 and the concave rib 1 are formed.
An intervening rib 16 welded and connected between the two is formed.

【００３１】 ついで、前記金型中で冷却したのち、
型開きを行い、ブロー成形製中空二重壁成形品を取出
す。Then, after cooling in the mold,
Open the mold and take out the blow molded hollow double wall molded product.

【００３２】本発明においてブロー成形製中空二重壁成
形品の用途は、上記実施例に限定されるものではなく、
軽量であるとともに剛性等の機械的強度が大きいことが
要請されるキャビネットの棚板、テーブルの天板、電器
装置のハウジング等がある。In the present invention, the use of the blow molded hollow double-walled molded product is not limited to the above-described embodiment.
There are cabinet shelves, table tops, and electric device housings that are required to be lightweight and have high mechanical strength such as rigidity.

【００３３】また、熱可塑性樹脂としては、ＡＢＳ樹
脂、変性ポリフェニレンオキサイド系樹脂、ポリカーボ
ネート、ポリアミド、ポリプロピレン等が用いられる。As the thermoplastic resin, ABS resin, modified polyphenylene oxide resin, polycarbonate, polyamide, polypropylene and the like are used.

【００３４】[0034]

【発明の効果】本発明は上述のように構成されているの
で、次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.

【００３５】間隔をおいて対向する一方の壁および他方
の壁の少なくともいずれか片方の壁に凹凸部を有し、前
記間隔の長さが段階的に変化する段差部が形成されたブ
ロー成形製中空二重壁成形品において、一連のリブに切
れ目が無いため、軽量であるとともに剛性等の機械的強
度が大である。また一連のリブの成形性が向上するた
め、外観良好なものとなる。A blow-molded product having an uneven portion on at least one of the one wall and the other wall opposed to each other at intervals and having a step portion in which the length of the interval changes stepwise. In the hollow double-walled molded product, since a series of ribs have no break, it is lightweight and has high mechanical strength such as rigidity. In addition, since the formability of the series of ribs is improved, the appearance is good.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明に係るブロー成形製中空二重壁成形品を
天板に適用したワゴンの斜視図である。FIG. 1 is a perspective view of a wagon in which a blow molded hollow double wall molded product according to the present invention is applied to a top plate.

【図２】本発明に係るブロー成形製中空二重壁成形品の
一実施例を示し、（ａ）は平面図、（ｂ）は（ａ）のＡ
−Ａ線に沿う断面図、（ｃ）は（ａ）のＢ−Ｂ線に沿う
断面図である。FIG. 2 shows an embodiment of a blow molded hollow double wall molded product according to the present invention, wherein (a) is a plan view and (b) is A of (a).
FIG. 3C is a cross-sectional view along the line A, and FIG. 3C is a cross-sectional view along the line BB in FIG.

【図３】図２に示す実施例の他の部分を示し、（ａ）は
図２のＣ−Ｃ線に沿う断面図、（ｂ）は（ａ）のＤ−Ｄ
線に沿う断面図である。3A and 3B show another portion of the embodiment shown in FIG. 2, wherein FIG. 3A is a cross-sectional view taken along the line CC of FIG. 2, and FIG.
It is sectional drawing which follows a line.

【図４】本発明に係るブロー成形製中空二重壁成形品の
製造方法の各工程を示す金型主要部の部分断面図であ
る。FIG. 4 is a partial cross-sectional view of a main part of a mold, showing each step of a method for manufacturing a blow molded hollow double-walled product according to the present invention.

【図５】図４に示す各工程における各スライド部材の動
作を示す説明図である。FIG. 5 is an explanatory diagram showing an operation of each slide member in each step shown in FIG.

【図６】従来のブロー成形製中空二重壁成形品の製造方
法の各工程を示す金型主要部の模式部分断面図である。FIG. 6 is a schematic partial cross-sectional view of a main part of a mold showing respective steps of a conventional method of manufacturing a blow molded hollow double-walled product.

【符号の説明】[Explanation of symbols]

１ 天板 ２ａ 後方***部 ２ｂ 主載置面 ２ｃ 縁部 ２ｄ 仕切部 ２ｅ 前方載置面 ２ｆ コップ置部 ３ａ 後方フレーム用溝 ３ｂ 前方フレーム用溝 ４ 引出し ５ａ 後方フレーム ５ｂ 前方フレーム ７ ワゴン １１ 一方の壁 １１ａ 第１の凸部 １１ｂ 第１の平坦面 １１ｃ 第２の凸部 １１ｄ 第３の凸部 １１ｅ 第２の平坦面 １１ｆ 第１の凹部 １２ 他方の壁 １２ａ 第２の凹部 １２ｂ 第４の凸部 １２ｃ 第３の凹部 １３ 端壁 １４ インナーリブ １５ 凹状リブ ２１ 一方の金型 ２２ 他方の金型 ２３ インナーリブ用スライド部材 ２４ 凹状リブ用スライド部材 ２５ 直線移動手段 ２６ パリスン ２６ａ，２６ｂ 筋状凹部 REFERENCE SIGNS LIST 1 top plate 2a rear raised portion 2b main mounting surface 2c edge 2d partition portion 2e front mounting surface 2f cup mounting portion 3a rear frame groove 3b front frame groove 4 drawer 5a rear frame 5b front frame 7 wagon 11 one of Wall 11a First convex portion 11b First flat surface 11c Second convex portion 11d Third convex portion 11e Second flat surface 11f First concave portion 12 The other wall 12a Second concave portion 12b Fourth convex Part 12c Third recess 13 End wall 14 Inner rib 15 Concave rib 21 One mold 22 The other mold 23 Inner rib slide member 24 Concave rib slide member 25 Linear moving means 26 Parisin 26a, 26b Streak recess

フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B29C 49/00 - 49/80 Continuation of front page (58) Field surveyed (Int.Cl. 7 , DB name) B29C 49/00-49/80

Claims (5)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 間隔をおいて対向する一方の壁と他方の
壁とを備え、前記一方の壁と他方の壁の少なくともいず
れか片方の壁に設けられた凹凸部によって形成された少
なくとも一個の段差部を有する熱可塑性樹脂からなるブ
ロー成形製中空二重壁成形品であって、 前記一方の壁と他方の壁との間には、前記段差部の部位
に成形された介在リブによって互に溶着連結された一連
のリブが一体成形されており、しかも前記一連のリブは
前記段差部に対して交差する方向に延在することを特徴
とするブロー成形製中空二重壁成形品。At least one of a first wall and a second wall, which are opposed to each other at an interval, is formed by an uneven portion provided on at least one of the one wall and the other wall. A blow molded hollow double-walled molded product made of a thermoplastic resin having a stepped portion, wherein the one wall and the other wall are mutually interposed by an interposed rib formed at a portion of the stepped portion. A blow molded hollow double wall molded product, wherein a series of welded and connected ribs are integrally formed, and the series of ribs extend in a direction intersecting the step. 【請求項２】 介在リブによって互に溶着連結された一
連のリブが、一方の壁と他方の壁間に内在する板状のイ
ンナーリブと他方の壁の一部を凹状に形成してなる凹状
リブとからなることを特徴とする請求項１記載のブロー
成形製中空二重壁成形品。2. A series of ribs welded and connected to each other by intervening ribs, a plate-shaped inner rib existing between one wall and the other wall, and a concave shape formed by forming a part of the other wall into a concave shape. The blow molded hollow double-walled molded product according to claim 1, comprising a rib. 【請求項３】 インナーリブが一方の壁と他方の壁の対
向する平坦面の部位に設けられており、凹状リブが一方
の壁と他方の壁の少なくともいずれか片方の壁の凹凸部
が形成された部位に設けられたことを特徴とする請求項
２記載のブロー成形製中空二重壁成形品。3. An inner rib is provided at a portion of a flat surface facing one wall and the other wall, and a concave rib forms an uneven portion of at least one of the one wall and the other wall. The blow-molded hollow double-walled molded product according to claim 2, wherein the molded product is provided at a set portion. 【請求項４】 間隔をおいて対向する一方の壁と他方の
壁とを備え、前記一方の壁と他方の壁の少なくともいず
れか片方の壁に設けられた凹凸部によって形成された少
なくとも一個の段差部を有する熱可塑性樹脂からなるブ
ロー成形製中空二重壁成形品の製造方法であって、 前記一方の壁と他方の壁の外面を規制するとともに両者
のうちの少なくとも片方の壁に前記凹凸部を形成する形
状のキャビティを有する分割型式の金型を用い、型開き
した前記金型間に溶融したパリスンを配置して型閉じ
し、ついで前記パリスンの他方の壁となる部分を、前記
段差部の部位に介在リブを成形するための間隙部をおい
て個別に前記パリスンの一方の壁となる部分に向けて前
記段差部に交差する方向の筋状に変形させて筋状凹部を
形成してその先端部を前記パリスンの一方の壁となる部
分に溶着させたのち、前記パリスン内に加圧流体を導入
して前記キャビティに沿って膨張させるとともに前記各
筋状凹部を前記加圧流体の内圧によって変形させること
によって、前記間隙部によって成形される介在リブによ
って互に溶着連結され、しかも前記段差部に対して交差
する方向に延在する一連のリブを一体成形することを特
徴とするブロー成形製中空二重壁成形品の製造方法。4. An at least one wall, comprising one wall and the other wall opposed to each other at an interval, and formed by an uneven portion provided on at least one of the one wall and the other wall. A method for producing a blow-molded hollow double-walled molded product made of a thermoplastic resin having a stepped portion, wherein the irregularities are formed on at least one of the two walls while regulating the outer surfaces of the one wall and the other wall. Using a split mold having a cavity of a shape forming a part, disposing a melted parison between the opened molds, closing the mold, and then forming the other wall portion of the parison as the step A gap for forming an intervening rib is formed at the portion of the portion, and is individually deformed in a streak shape in a direction intersecting the step portion toward a portion to be one wall of the parison to form a streak-shaped recess. With its tip in front After being welded to a portion to be one wall of the parison, a pressurized fluid is introduced into the parison, expanded along the cavity, and each of the streaks is deformed by the internal pressure of the pressurized fluid. A series of ribs which are welded and connected to each other by intervening ribs formed by the gaps, and which are integrally formed with a series of ribs extending in a direction intersecting the step portion. Manufacturing method of molded article. 【請求項５】 間隔をおいて対向する一方の壁と他方の
壁とを備え、前記一方の壁と他方の壁の少なくともいず
れか片方の壁に設けられた凹凸部によって形成された少
なくとも一個の段差部を有する熱可塑性樹脂からなるブ
ロー成形製中空二重壁成形品の製造方法であって、 前記一方の壁と他方の壁の外面を規制するとともに両者
のうちの少なくとも片方の壁に前記凹凸部を形成する形
状のキャビティを有する分割型式の金型を用い、型開き
した前記金型間に溶融したパリスンを配置して型閉じ
し、ついで前記パリスンの他方の壁となる部分を、前記
段差部の部位に介在リブを成形するための間隙部をおい
て個別に進退可能な前記段差部に交差する方向の板状の
スライド部材を前記キャビティ内へ突き出すことによっ
てそれぞれ筋状に変形させて筋状凹部を形成してその先
端部を前記パリスンの一方の壁となる部分に溶着させた
のち、前記板状のスライド部材のうちの少なくとも一つ
を引き込ませたのち、前記パリスン内に加圧流体を導入
して前記キャビティに沿って膨張させるとともに前記各
筋状凹部を前記加圧流体の内圧によって変形させること
によって、前記間隙部によって成形される介在リブによ
って互に溶着連結された一方の壁と他方の壁間に内在す
る板状のインナーリブと他方の壁の一部を凹状に形成し
てなる凹状リブからなり、しかも前記段差部に対して交
差する方向に延在する一連のリブを一体成形することを
特徴とするブロー成形製中空二重壁成形品の製造方法。5. An at least one wall, comprising one wall and the other wall facing each other at an interval, and formed by an uneven portion provided on at least one of the one wall and the other wall. A method for producing a blow-molded hollow double-walled molded product made of a thermoplastic resin having a stepped portion, wherein the irregularities are formed on at least one of the two walls while regulating the outer surfaces of the one wall and the other wall. Using a split mold having a cavity of a shape forming a part, disposing a melted parison between the opened molds, closing the mold, and then forming the other wall portion of the parison as the step A plate-like slide member in a direction intersecting the step portion which can be individually advanced and retracted is formed in the cavity by providing a gap portion for forming an intervening rib at a portion of the portion, thereby deforming into a streak shape. After forming a streak-like concave portion and welding the tip end thereof to a portion to be one wall of the parison, at least one of the plate-like slide members is pulled in, and then the crimped portion is inserted into the parison. By introducing a pressurized fluid and expanding along the cavity and deforming each of the streak-shaped recesses by the internal pressure of the pressurized fluid, one of the ones welded and connected to each other by an intervening rib formed by the gap portion A series of ribs comprising a plate-shaped inner rib existing between the wall and the other wall and a concave rib formed by forming a part of the other wall in a concave shape, and extending in a direction intersecting the step portion; A method for producing a blow molded hollow double-walled molded product, comprising:
JP02626194A 1994-01-28 1994-01-28 Blow-molded hollow double-walled molded product and method for producing the same Expired - Lifetime JP3344440B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP02626194A JP3344440B2 (en) 1994-01-28 1994-01-28 Blow-molded hollow double-walled molded product and method for producing the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP02626194A JP3344440B2 (en) 1994-01-28 1994-01-28 Blow-molded hollow double-walled molded product and method for producing the same

Publications (2)

Publication Number Publication Date
JPH07214643A JPH07214643A (en) 1995-08-15
JP3344440B2 true JP3344440B2 (en) 2002-11-11

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ID=12188330

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Application Number Title Priority Date Filing Date
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4523471B2 (en) * 2005-03-31 2010-08-11 キョーラク株式会社 Luggage board for automobile
JP6033259B2 (en) * 2014-06-27 2016-11-30 テイ・エス テック株式会社 Storage container

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