JPH03230927A - Manufacture of resin hollow pipe - Google Patents
Manufacture of resin hollow pipeInfo
- Publication number
- JPH03230927A JPH03230927A JP2574990A JP2574990A JPH03230927A JP H03230927 A JPH03230927 A JP H03230927A JP 2574990 A JP2574990 A JP 2574990A JP 2574990 A JP2574990 A JP 2574990A JP H03230927 A JPH03230927 A JP H03230927A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- molding
- water
- core
- blow
- 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.)
- Pending
Links
- 229920005989 resin Polymers 0.000 title claims abstract description 53
- 239000011347 resin Substances 0.000 title claims abstract description 53
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000000465 moulding Methods 0.000 claims abstract description 11
- 238000000071 blow moulding Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 10
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 8
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 238000001746 injection moulding Methods 0.000 abstract description 8
- 229920003171 Poly (ethylene oxide) Polymers 0.000 abstract description 4
- 230000006866 deterioration Effects 0.000 abstract description 3
- 229920001903 high density polyethylene Polymers 0.000 abstract description 2
- 239000004700 high-density polyethylene Substances 0.000 abstract description 2
- 238000002844 melting Methods 0.000 description 14
- 230000008018 melting Effects 0.000 description 14
- 239000000956 alloy Substances 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 8
- -1 bismuth Chemical class 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 229920002126 Acrylic acid copolymer Polymers 0.000 description 1
- 229920002845 Poly(methacrylic acid) Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- XHIOOWRNEXFQFM-UHFFFAOYSA-N ethyl prop-2-enoate;prop-2-enoic acid Chemical compound OC(=O)C=C.CCOC(=O)C=C XHIOOWRNEXFQFM-UHFFFAOYSA-N 0.000 description 1
- 238000010101 extrusion blow moulding Methods 0.000 description 1
- 238000010097 foam moulding Methods 0.000 description 1
- WSFSSNUMVMOOMR-UHFFFAOYSA-N formaldehyde Substances O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920002432 poly(vinyl methyl ether) polymer Polymers 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 1
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 1
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
- B29C45/26—Moulds
- B29C45/261—Moulds having tubular mould cavities
- B29C45/2614—Moulds having tubular mould cavities for manufacturing bent tubular articles using an undercut forming mould core
-
- 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
- B29C33/52—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles soluble or fusible
-
- 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
- B29C45/40—Removing or ejecting moulded articles
- B29C45/44—Removing or ejecting moulded articles for undercut articles
- B29C45/4457—Removing or ejecting moulded articles for undercut articles using fusible, soluble or destructible cores
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、屈曲部や分岐を有する複雑な形状の樹脂製中
空管を容易に提供する製造法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a manufacturing method for easily providing a resin hollow tube having a complicated shape having bent portions and branches.
樹脂製中空管を製造する方法としては、従来より押出成
形あるいはブロー成形などが知られている。しかしなが
ら、これらの方法では、中空管の形状自由度に制限があ
り、殊にフランジ部を有する製品を得ることは容易では
ない。すなわち、押出成形では連続的に中空管を製造出
来るが、途中で形状が異なったり、分岐を有したり、あ
るいはフランジを有する製品を得ることはほとんど不可
能である。また、ブロー成形の場合は、分岐を有したり
中途で外径の変化する製品を得ることは可能だが、中空
管内面の平滑度を得るのは困難であり、しかも、樹脂の
溶融加工時の粘性挙動によって使用可能な材料に制限を
受け、更に、ブロー成形だけではフランジを有する成形
品や、中途に厚肉部や製品固定用のボルト取付は部を有
する成形品を得ることは極めて難しい。Extrusion molding, blow molding, and the like are conventionally known methods for manufacturing resin hollow tubes. However, with these methods, the degree of freedom in the shape of the hollow tube is limited, and it is particularly difficult to obtain a product having a flange portion. That is, although extrusion molding allows hollow tubes to be manufactured continuously, it is almost impossible to obtain products that have different shapes, branches, or flanges along the way. In addition, in the case of blow molding, it is possible to obtain products that have branches or whose outer diameter changes midway through, but it is difficult to obtain a smooth inner surface of the hollow tube, and moreover, it is difficult to obtain a product that has branches or whose outer diameter changes in the middle. The materials that can be used are limited by the viscous behavior of .
一方、中子を使い、射出成形もしくは、圧縮成形等の手
段により中子の周辺に樹脂を形成し、しかる後に中子を
抜いて中空の製品を得る方法が知られているが、中空管
が屈曲していたり、分岐があったりする場合には、樹脂
を破壊することなく中子を抜くのは困難である。このた
め、低融点合金を中子に用い、中空管を形成する樹脂の
溶解しない温度で中子を解かし出す方法が提案されてい
る。しかしながら、低融点合金の融解温度を樹脂が溶解
しない温度に制御するために、ビスマスなどの稀元素金
属を配合することが必要であるが、低融点合金自体が極
めて高価であり、かつまた低融点合金を溶解する際に、
健康上有害なガスが発生し、公害問題を誘発する危険性
がある。また、低融点合金に樹脂分もしくは樹脂の添加
剤が溶出するために、低融点合金を再生使用する際に、
溶出物を除去する作業が必要になり、エネルギーコスト
も高くなる。また、低融点合金を溶かす際に樹脂が加熱
を受けるため、合金の融解温度で熱変形が無くかつ熱的
劣化の少ない樹脂を選択する必要があり、使用される樹
脂に制限が生じる。On the other hand, a method is known in which a core is used, resin is formed around the core by means such as injection molding or compression molding, and then the core is removed to obtain a hollow product. If the core is bent or branched, it is difficult to remove the core without destroying the resin. For this reason, a method has been proposed in which a low melting point alloy is used for the core and the core is melted at a temperature that does not melt the resin forming the hollow tube. However, in order to control the melting temperature of the low melting point alloy to a temperature at which the resin does not melt, it is necessary to blend rare metals such as bismuth, but the low melting point alloy itself is extremely expensive, and also has a low melting point. When melting the alloy,
There is a risk that gases harmful to health will be generated and cause pollution problems. In addition, because the resin content or resin additives are leached into the low melting point alloy, when recycling the low melting point alloy,
Work to remove the eluate is required, which also increases energy costs. Furthermore, since the resin is heated when melting the low melting point alloy, it is necessary to select a resin that does not undergo thermal deformation at the melting temperature of the alloy and has little thermal deterioration, which places restrictions on the resins that can be used.
したがって、使用する樹脂の制約が無く、しかも、工業
的に容易な方法で、屈曲部や分岐を有する樹脂製中空管
を製造する方法は、見出されていないのが実情であった
。Therefore, the reality is that no method has been found for manufacturing resin hollow tubes having bent portions and branches in an industrially easy manner without restrictions on the resin to be used.
本発明者らは、容易に除去可能な中子の製造法について
鋭意検討を続けた結果、熱可塑性の水溶性樹脂をブロー
成形して成形用中子を作り、それを金型に挿入してその
周囲を所定の熱可塑性樹脂で射出成形し、その後で水溶
性樹脂からなる中子を水で溶解して取り除くことにより
、屈曲部や分岐のある複雑な形状の中空管を容易に製造
しうろことを見出して本発明に到達したものである。す
なわち、本発明の要旨は、
水溶性樹脂をブロー成形することによって得られる中子
を金型に挿入し、その周囲に成形用熱可塑性樹脂を射出
成形した後、該中子を水に溶解せしめて除去することを
特徴とする樹脂製中空管の製造法、
に存する。The inventors of the present invention continued to study intensively on a method for producing a core that can be easily removed. As a result, the inventors created a molding core by blow molding a thermoplastic water-soluble resin and inserted it into a mold. By injection molding the periphery with a specified thermoplastic resin, and then dissolving the core made of water-soluble resin in water and removing it, hollow tubes with complex shapes with bends and branches can be easily manufactured. The present invention was achieved by discovering scales. That is, the gist of the present invention is to insert a core obtained by blow molding a water-soluble resin into a mold, injection mold a thermoplastic resin around the core, and then dissolve the core in water. A method for manufacturing a resin hollow tube, characterized in that the method is characterized in that the resin hollow tube is removed by removing the tube.
以下、本発明を具体的に説明する。The present invention will be specifically explained below.
本発明における樹脂製中空管は、本発明の実施可能な範
囲内で、形状や用途において特に制限は無く、屈曲部や
分岐のある複雑な形状の中空管を自由に製造することが
できる。The resin hollow tube of the present invention is not particularly limited in shape or use within the scope of the present invention, and hollow tubes with complex shapes with bends and branches can be freely manufactured. .
また、得られる樹脂製中空管の材料においても、熱可塑
性樹脂であれば、特の制限は無く、例えばポリアミド、
ポリエステル、ポリカーボネート、ポリエチレン、ポリ
プロピレン等が用いられる。In addition, there are no particular restrictions on the material of the resulting resin hollow tube as long as it is a thermoplastic resin, such as polyamide,
Polyester, polycarbonate, polyethylene, polypropylene, etc. are used.
また、本発明で使用する中子を形成する水溶性樹脂とは
、分子内に−ＣＯＮＨ，基、−ＣＯＯＨ基、−ＯＨ基を
持つ水に可溶な線状高分子あり、かつ熱可塑性でブロー
成形が可能であれば特に限定は無く、例えばポリアクリ
ルアミド、ポリアクリル酸、ポリメタクリル酸、ポリイ
タコン酸、ポリビニルアルコール、ポリエチレンオキシ
ド、ポリビニルピロリドン、ポリビニルメチルエーテル
、あるいはそれらを主体とする共重合体が挙げられ、具
体的には、水溶性ポリエチレンオキサイド樹脂（例：明
成化学工業■製、商品名：アルコックス）エチルアクリ
レート−アクリル酸共重合樹脂（スイスＢＥＬＬＡＮＤ
Ａ、Ｇ、製 ＢＥＬＬＡＮ］） ｐｌａｓｔｉｃ
）などが挙げられる。In addition, the water-soluble resin forming the core used in the present invention is a water-soluble linear polymer having -CONH, -COOH, and -OH groups in the molecule, and is thermoplastic. There is no particular limitation as long as blow molding is possible; for example, polyacrylamide, polyacrylic acid, polymethacrylic acid, polyitaconic acid, polyvinyl alcohol, polyethylene oxide, polyvinylpyrrolidone, polyvinyl methyl ether, or a copolymer mainly composed of these. Specific examples include water-soluble polyethylene oxide resins (e.g., manufactured by Meisei Kagaku Kogyo ■, trade name: Alcox), ethyl acrylate-acrylic acid copolymer resins (Switzerland BELLAND
A, G, BELLAN]) plastic
), etc.
水溶性樹脂、を用いた中子のブロー成形については、当
業者に周知のブロー成形法ならびに成形技術が適用でき
る。中子の形状においても特に制限は無いが、中子を射
出成形用の金型に挟んで固定するための部分を予め両端
に設定しておくのが好ましい。更に、中子の肉厚は、射
出成形の際の樹脂圧力に耐えるように厚く設定しておく
ことが好ましく、また、ブロー成形された中子の内部に
、補強のために部分的に金属管を挿入しておくと更に良
好な結果が得られる。Regarding the blow molding of the core using the water-soluble resin, blow molding methods and molding techniques well known to those skilled in the art can be applied. Although there is no particular restriction on the shape of the core, it is preferable to provide portions at both ends in advance for sandwiching and fixing the core between injection molds. Furthermore, it is preferable to set the wall thickness of the core to be thick enough to withstand the resin pressure during injection molding, and metal tubes are partially installed inside the blow-molded core for reinforcement. Even better results can be obtained by inserting .
このようにして得られた中子は、射出成形用の金型に挿
入固定し、その外周に成形用熱可塑性樹脂を射出成形す
る。中空管を成形する成形用熱可塑性樹脂としては、中
子の表面をすぐに融解するような高い融点と比熱を持つ
ものを用いると、得られた中空管の内面に肌荒れを生じ
て好ましくない。このため、成形用熱可塑性樹脂として
は、中子を形成する水溶性樹脂の融点より１００℃望ま
しくは７５℃以上高くない範囲の融点を持つ樹脂を選択
し、しかも射出成形時の圧力が低く出来るように溶融粘
度の低い材料を使用し、射出圧力が１０００ｋｇ／ｃｄ
内、好ましくは６００ｋｇ／ａｆ以内の条件で射出成形
することが好適である。樹脂圧力を低減するために、発
泡成形を行うことも良好な結果を与える。また、中子を
予め低温に冷却してから金型に挿入して射出成形するこ
とも良好な結果を与える。The core thus obtained is inserted and fixed into a mold for injection molding, and a thermoplastic resin for molding is injection molded around its outer periphery. It is preferable to use a thermoplastic resin for molding the hollow tube that has a high melting point and specific heat that melts the surface of the core immediately, as this will cause roughness on the inner surface of the resulting hollow tube. do not have. Therefore, as the thermoplastic resin for molding, a resin with a melting point within a range of 100°C or more, preferably no more than 75°C higher than the melting point of the water-soluble resin forming the core is selected, and the pressure during injection molding can be lowered. Materials with low melt viscosity are used, and the injection pressure is 1000 kg/cd.
Among these, injection molding is preferably carried out under conditions of 600 kg/af or less. Foam molding to reduce resin pressure also gives good results. In addition, good results can also be obtained by cooling the core to a low temperature in advance and then inserting it into a mold for injection molding.
樹脂製中空管の成形後は、水やスチームを用いて水溶性
樹脂を溶解除去する。水溶性樹脂の溶解は、成形品自体
を水中に浸漬したり、スチーム下に放置したり、中子内
部に水やスチームを通したりすることによって行われる
。水溶性樹脂によっては、Ｐ Ｈを調整することによっ
て溶解速度を早くすることが可能であり、その場合には
中空管を形成する樹脂を侵さない範囲内で水のＰＨを調
整すると良い。After molding the resin hollow tube, water or steam is used to dissolve and remove the water-soluble resin. The water-soluble resin is dissolved by immersing the molded product itself in water, leaving it under steam, or passing water or steam inside the core. Depending on the water-soluble resin, it is possible to increase the dissolution rate by adjusting the pH, and in that case, it is preferable to adjust the pH of the water within a range that does not attack the resin forming the hollow tube.
このように水溶性樹脂を溶解して取り除けば、所定の形
状の樹脂製中空管が得られる。By dissolving and removing the water-soluble resin in this manner, a resin hollow tube having a predetermined shape can be obtained.
以下に、本発明を実施例によって具体的に説明するが、
本発明はその主旨を逸脱しない限りにおいて、本実施例
により何ら制限されるものではない。The present invention will be specifically explained below with reference to Examples.
The present invention is not limited to this embodiment in any way as long as it does not depart from the spirit thereof.
実施例
市販の水溶性ポリエチレンオキサイド樹脂（明成化学工
業例製、商品名：アルコックスＥ２４０）を用いて、ス
クリュー径５０ｍｍのブロー成形機（日本製鋼所■製、
ＮＢ３Ｂ Ｓ５０型）にて、第１図に示すような平均
肉厚３鶴の、Ｓ字状の形状を有する成形品を、樹脂温度
１００℃にてブロー成形した。Example Using a commercially available water-soluble polyethylene oxide resin (manufactured by Meisei Chemical Industry Co., Ltd., trade name: Alcox E240), a blow molding machine with a screw diameter of 50 mm (manufactured by Japan Steel Works, Ltd.,
A molded article having an S-shape and an average wall thickness of 3 cranes as shown in FIG. 1 was blow molded using a NB3B S50 model at a resin temperature of 100°C.
こうして得られた成形品を一４０°Ｃに冷却した後金型
に挿入した。市販の高密度ポリエチレン樹脂（三菱化成
■製、商品名：三菱ポリエチレンＪＵ−０８０＞を、樹
脂温度２００℃にて、第２図に示すように、肉厚３ｆｌ
で、厚み５ｗのフランジ部を両端に有する成形品を射出
成形した。The molded product thus obtained was cooled to -40°C and then inserted into a mold. A commercially available high-density polyethylene resin (manufactured by Mitsubishi Kasei ■, product name: Mitsubishi Polyethylene JU-080) was heated to a resin temperature of 200°C to a thickness of 3fl as shown in Figure 2.
A molded product having flange portions with a thickness of 5W at both ends was injection molded.
こうして得られた製品を、５０℃の水を循環したウォー
ターバス中に２４時間放置し、水溶性樹脂を溶解せしめ
、所定の形状の樹脂製中空管を得た。The product thus obtained was left in a water bath in which water at 50° C. was circulated for 24 hours to dissolve the water-soluble resin, thereby obtaining a resin hollow tube of a predetermined shape.
実施例に示すように、本発明の製造法によれば、屈曲部
や分岐等複雑な形状を有する樹脂製中空管を容易に製造
することが可能である。また、熱変形や熱劣化を少なく
することができるので好適である。As shown in the examples, according to the manufacturing method of the present invention, it is possible to easily manufacture a resin hollow tube having a complicated shape such as a bent portion or a branch. Further, it is suitable because thermal deformation and thermal deterioration can be reduced.
第１図は、本発明の実施例で用いた中子の形状を示す図
である。
第２図は、本発明の実施例で得られた成形品（中子の除
去前）を示す図である。図中、１は中子、２は、樹脂製
中空管を示す。FIG. 1 is a diagram showing the shape of a core used in an example of the present invention. FIG. 2 is a diagram showing a molded product (before the core is removed) obtained in an example of the present invention. In the figure, 1 indicates a core, and 2 indicates a resin hollow tube.
Claims (1)
れる中子を金型に挿入し、その周囲に成形用熱可塑性樹
脂を射出成形した後、該中子を水に溶解せしめて除去す
ることを特徴とする樹脂製中空管の製造法。(1) A core obtained by blow molding a water-soluble resin is inserted into a mold, a thermoplastic resin for molding is injection molded around it, and then the core is dissolved in water and removed. A method for manufacturing a resin hollow tube characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2574990A JPH03230927A (en) | 1990-02-05 | 1990-02-05 | Manufacture of resin hollow pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2574990A JPH03230927A (en) | 1990-02-05 | 1990-02-05 | Manufacture of resin hollow pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03230927A true JPH03230927A (en) | 1991-10-14 |
Family
ID=12174481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2574990A Pending JPH03230927A (en) | 1990-02-05 | 1990-02-05 | Manufacture of resin hollow pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03230927A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05212728A (en) * | 1992-02-06 | 1993-08-24 | Daikyo Inc | Production of tubular object made of synthetic resin |
| JP2003525437A (en) * | 2000-03-02 | 2003-08-26 | マイクロ・モーション・インコーポレーテッド | Method and apparatus for manufacturing Coriolis flowmeters mainly composed of plastic |
-
1990
- 1990-02-05 JP JP2574990A patent/JPH03230927A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05212728A (en) * | 1992-02-06 | 1993-08-24 | Daikyo Inc | Production of tubular object made of synthetic resin |
| JP2003525437A (en) * | 2000-03-02 | 2003-08-26 | マイクロ・モーション・インコーポレーテッド | Method and apparatus for manufacturing Coriolis flowmeters mainly composed of plastic |
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