JPH0336020B2 - - Google Patents
Info
- Publication number
- JPH0336020B2 JPH0336020B2 JP58232405A JP23240583A JPH0336020B2 JP H0336020 B2 JPH0336020 B2 JP H0336020B2 JP 58232405 A JP58232405 A JP 58232405A JP 23240583 A JP23240583 A JP 23240583A JP H0336020 B2 JPH0336020 B2 JP H0336020B2
- Authority
- JP
- Japan
- Prior art keywords
- synthetic resin
- extrusion
- layer
- inner layer
- outer layer
- 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
Links
- 229920003002 synthetic resin Polymers 0.000 claims description 94
- 239000000057 synthetic resin Substances 0.000 claims description 94
- 238000001125 extrusion Methods 0.000 claims description 30
- 238000000465 moulding Methods 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 229920005989 resin Polymers 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 230000004927 fusion Effects 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D23/00—Producing tubular articles
- B29D23/18—Pleated or corrugated hoses
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0013—Extrusion moulding in several steps, i.e. components merging outside the die
- B29C48/0015—Extrusion moulding in several steps, i.e. components merging outside the die producing hollow articles having components brought in contact outside the extrusion die
- B29C48/0016—Extrusion moulding in several steps, i.e. components merging outside the die producing hollow articles having components brought in contact outside the extrusion die using a plurality of extrusion dies
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/303—Extrusion nozzles or dies using dies or die parts movable in a closed circuit, e.g. mounted on movable endless support
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2016/00—Articles with corrugations or pleats
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/18—Pleated or corrugated hoses
- B29L2023/186—Pleated or corrugated hoses having a smooth internal wall
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
Description
【発明の詳細な説明】
本発明は合成樹脂外層と合成樹脂内層とを熱融
着させた後、これを冷却し硬化させて二重壁管を
製造する装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for manufacturing a double-walled pipe by heat-sealing an outer synthetic resin layer and an inner synthetic resin layer, and then cooling and curing them.
この種の二重壁管の製造装置は、連続成形され
る筒状の成形面を備えた成形型の内部に合成樹脂
押出部と冷却部とが設けられており、成形型を一
方向に走行させながらその成形面上へ合成樹脂押
出部から合成樹脂外層と合成樹脂内層とを順次溶
融状態で押し出して両層を熱融着させ、その後こ
れを冷却部の周囲に導いて冷却し硬化させ得るよ
うになつている。 This type of double-walled tube manufacturing equipment is equipped with a synthetic resin extrusion section and a cooling section inside a mold with a cylindrical molding surface that is continuously molded, and runs in one direction through the mold. The outer synthetic resin layer and the inner synthetic resin layer are sequentially extruded in a molten state from the synthetic resin extrusion unit onto the molding surface while the molding process is in progress, the two layers are thermally fused, and then they are guided around the cooling unit to be cooled and hardened. It's becoming like that.
このような二重壁管の製造装置においては、成
形型の走行に伴ない、成形面上への合成樹脂外層
の押し出し、合成樹脂外層の内面への合成樹脂内
層の押し出しと両層の熱融着、冷却硬化の各工程
が順次行われる。これらの工程のうち熱融着を行
う工程は、従来装置では、例えば特公昭46−9673
号公報に開示されているように、合成樹脂内層の
内部へ加圧空気を送り込み、その空気圧力を利用
して合成樹脂内層を成形面上へ押し出されている
合成樹脂外層に押し付ける手段が採られている。
しかしながら、合成樹脂押出部から押し出される
合成樹脂内層の肉厚はその周方向の各部において
均一になつていない場合が多く、そのような場合
に空気圧力を利用して合成樹脂内層を合成樹脂外
層を押し付けると肉厚の薄い部分が肉厚の厚い部
分よりも強い力で合成樹脂外層に押し付けられる
ことになつて熱融着の状態にむらを生じることが
あるばかりでなく、製造された二重壁管の内壁が
その内面において波状に小さくうねつた状態にな
ることがある。 In this type of double-walled pipe manufacturing equipment, as the mold moves, the outer synthetic resin layer is extruded onto the molding surface, the inner synthetic resin layer is extruded onto the inner surface of the outer synthetic resin layer, and both layers are thermally fused. The steps of deposition and cooling and hardening are performed sequentially. Among these steps, the step of heat fusion can be performed using conventional equipment, for example, in Japanese Patent Publication No. 46-9673.
As disclosed in the publication, a method is adopted in which pressurized air is sent into the interior of the synthetic resin inner layer and the air pressure is used to press the synthetic resin inner layer against the synthetic resin outer layer that is being extruded onto the molding surface. ing.
However, the thickness of the synthetic resin inner layer extruded from the synthetic resin extrusion part is often not uniform in each part in the circumferential direction, and in such cases, air pressure is used to change the synthetic resin inner layer to the synthetic resin outer layer. When pressed, the thinner parts are pressed against the synthetic resin outer layer with a stronger force than the thicker parts, which may not only cause uneven thermal bonding, but also cause damage to the manufactured double wall. The inner wall of the tube may become slightly wavy on its inner surface.
本発明は上記事情に鑑みてなされたもので、合
成樹脂押出部と冷却部との間に筒状体を設け、こ
の筒状体を合成樹脂押出部から押し出された合成
樹脂内層に接触させてこれを合成樹脂外層に押し
付けることにより、両層がどの部分においても均
一な状態で熱融着されており、しかも内面にうね
りを生じていない内壁を備える二重壁管を製造す
ることのできる装置を提供することを目的とす
る。 The present invention has been made in view of the above circumstances, and includes providing a cylindrical body between a synthetic resin extrusion section and a cooling section, and bringing this cylindrical body into contact with the synthetic resin inner layer extruded from the synthetic resin extrusion section. By pressing this onto the synthetic resin outer layer, it is possible to manufacture a double-walled tube in which both layers are uniformly heat-sealed in all parts, and which has an inner wall with no undulations on the inner surface. The purpose is to provide
以下、図示した実施例にしたがつて本発明によ
る二重壁管の製造装置を説明する。 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An apparatus for manufacturing a double-walled pipe according to the present invention will be described below with reference to the illustrated embodiments.
第１図に例示されている装置は二重壁コルゲー
ト管を連続成形により製造するものであり、その
成形型１は凹凸状に構成された筒状の成形面１１
を備えている。図示例の場合、成形型１は一対の
半割型に２分割されており、各半割型は多数の成
形型ブロツク１ａが無端状に連結されてなる。こ
のような成形型１の内部、即ち上記した筒状の成
形面１１によつて囲まれる空間部分に合成樹脂押
出部２と冷却部３とが上記成形面１１に対して同
心状に設けられている。合成樹脂押出部２は、そ
の外周に形成された凹陥部２１と、凹陥部２１の
前部で円環状に開口する溶融合成樹脂の第１押出
通路２２ａと、凹陥部２１の後部で円環状に開口
する溶融合成樹脂の第２押出通路２２ｂと、第２
押出通路２２ｂから押し出された合成樹脂外層
P2の内側で凹陥部２１に向けて開口する給気路
２３ｂと、第１押出通路２２ａから押し出された
合成樹脂内層P1と上記成形面１１で成形されて
いる合成樹脂外層P2との間の空間に向けて開口
する排気路２３ａと、を備えていると共に、凹陥
部２１と排気路２３ａの開口との間の部分が成形
面１１で成形されている合成樹脂外層P2の内面
に面している。また、合成樹脂押出部２の先端部
には潤滑材吐出孔２４が開設されている。他方、
冷却部３は合成樹脂押出部２の前部に配置されて
いる。そして、合成樹脂押出部２と冷却部３との
間に筒状体４が設けられ、この筒状体４によつて
合成樹脂押出部２と冷却部３との間隙が塞がれて
いる。図示例において筒状体４の後端部にはテー
パ面４１が形成されている。なお、第２図に示す
ように、筒状体４の外周面と成形面１における筒
状の成形面１１の凸部１１ａとの隙間寸法ｌは、
後述する合成樹脂内層P1と合成樹脂外層P2とが
重合状となつてその隙間を通過するときに筒状体
４の外周面が合成樹脂内層P1の内面に押圧力を
加えることなく接触する程度に設定されている。 The apparatus illustrated in FIG. 1 is for manufacturing double-walled corrugated pipes by continuous molding, and the mold 1 has a cylindrical molding surface 11 having an uneven structure.
It is equipped with In the illustrated example, the mold 1 is divided into a pair of half molds, and each half mold is made up of a large number of mold blocks 1a connected endlessly. Inside such a mold 1, that is, in a space surrounded by the cylindrical molding surface 11 described above, a synthetic resin extrusion part 2 and a cooling part 3 are provided concentrically with respect to the molding surface 11. There is. The synthetic resin extrusion part 2 has a concave part 21 formed on its outer periphery, a first extrusion passage 22a for molten synthetic resin that opens in an annular shape at the front part of the concave part 21, and an annular part in the rear part of the concave part 21. a second extrusion passage 22b for molten synthetic resin that is open;
Synthetic resin outer layer extruded from extrusion passage 22b
The air supply passage 23b opens toward the concave portion 21 inside P 2 , the synthetic resin inner layer P 1 extruded from the first extrusion passage 22a, and the synthetic resin outer layer P 2 molded by the molding surface 11. The inner surface of the synthetic resin outer layer P 2 is provided with an exhaust passage 23 a that opens toward the space between them, and the portion between the recessed part 21 and the opening of the exhaust passage 23 a is molded with the molded surface 11 . facing. Furthermore, a lubricant discharge hole 24 is provided at the tip of the synthetic resin extrusion section 2 . On the other hand,
The cooling section 3 is arranged in front of the synthetic resin extrusion section 2 . A cylindrical body 4 is provided between the synthetic resin extrusion section 2 and the cooling section 3, and the gap between the synthetic resin extrusion section 2 and the cooling section 3 is closed by the cylindrical body 4. In the illustrated example, a tapered surface 41 is formed at the rear end of the cylindrical body 4 . As shown in FIG. 2, the gap size l between the outer peripheral surface of the cylindrical body 4 and the convex portion 11a of the cylindrical molding surface 11 on the molding surface 1 is as follows:
When the synthetic resin inner layer P 1 and the synthetic resin outer layer P 2 (described later) form a polymer and pass through the gap, the outer peripheral surface of the cylindrical body 4 contacts the inner surface of the synthetic resin inner layer P 1 without applying any pressing force. It is set to the extent that
かかる製造装置において、成形型１を第１図矢
印Ｘ方向に所定速度で走行させながら、溶融樹脂
押出部２の第１押出通路２２ａ及び第２押出通路
２２ｂを通して溶融樹脂を連続して押し出し、同
時に給気路２３ｂから凹陥部２１内へ圧力空気を
給気すると共に排気路２３ａから排気する。 In this manufacturing apparatus, while the mold 1 is running at a predetermined speed in the direction of the arrow X in FIG. Pressurized air is supplied into the concave portion 21 from the air supply path 23b and exhausted from the exhaust path 23a.
このようにすると、合成樹脂押出部２における
凹陥部２１と上記排気路２３ａの開口との間の部
分が成形面１１で成形されている合成樹脂外層
P2の内面に面しているため、凹陥部２１の内部
は正圧になり、排気路２３ａが開口している空間
は負圧になり、その結果、第２押出通路２２ｂか
ら押し出された溶融樹脂が凹陥部２１へ給気され
ていることにより生じている内外の差圧により成
形面１１に押し付けられて凹凸状の合成樹脂外層
P2を形成し、他方、第１押出通路２２ａから押
し出された溶融樹脂が排気路２３ａから排気する
ことにより発揮される吸引効果によつて、既に凹
凸状に成形されている溶融樹脂外層P2の内面に
熱融着され、合成樹脂内層P1を形成する。 In this way, the synthetic resin outer layer formed with the molding surface 11 forms a portion between the concave portion 21 of the synthetic resin extrusion portion 2 and the opening of the exhaust passage 23a.
Since it faces the inner surface of P 2 , the inside of the concave portion 21 has a positive pressure, and the space where the exhaust passage 23a is open has a negative pressure, and as a result, the melt extruded from the second extrusion passage 22b The resin is pressed against the molding surface 11 due to the differential pressure between the inside and outside that is generated when air is supplied to the concave portion 21, resulting in an uneven synthetic resin outer layer.
On the other hand, the molten resin outer layer P 2 is already formed into an uneven shape due to the suction effect exerted when the molten resin extruded from the first extrusion passage 22a is exhausted from the exhaust passage 23a . is thermally fused to the inner surface of the synthetic resin inner layer P1 .
こうして熱融着した合成樹脂内層P1と合成樹
脂外層P2は成形型１が走行するのに伴なつて筒
状体４の外周部分を通過する。その場合、第２図
によく示されているように、合成樹脂内層P1の
内面に筒状体４の外周面が接触し、合成樹脂内層
P1を保形する。このとき、第１押出通路２２ａ
から押し出された合成樹脂内層P1が合成樹脂外
層P2に望ましい状態で熱融着されていれば、合
成樹脂内層P1の内周直径が筒状体４の外周直径
とほぼ同一になつているから合成樹脂内層P1は
その内周面のうねりが平坦に修正される。また、
合成樹脂内層P1が合成樹脂外層P2に望ましい状
態で熱融着されていない場合、例えば合成樹脂内
層P1の肉厚が不均一なためにその周方向の各部
の熱融着状態が不均一になつている場合は合成樹
脂内層P1が筒状体４と接触することによつてそ
の肉厚が均一なものに矯正されるから上記熱融着
状態が均一に修正される。このとき合成樹脂内層
P1の内周面のうねりや肉厚の矯正はきわめて微
小なものの修正を行うものであり、大きなうねり
や肉厚差の大きいものはここでは調整不可能であ
る。なお、図示例の筒状体４はその後端部にテー
パ面４１を備えており、このテーパ面４１が合成
樹脂内層P1を筒状体４の外周部分に呼び込むた
めのガイドとして役立つので、筒状体４の後端に
合成樹脂内層P1がひつかかつて合成樹脂が団子
状に滞ることはない。また、筒状体４としてその
表面にテフロン加工のような滑性付与処理を施し
たものを使用すれば、溶融状態の合成樹脂内層
P1が該筒状体４に付着せず、その内面の平滑度
が一層向上される利点がある。かかる利点は、潤
滑材吐出孔２４から潤滑材を筒状体４の外周面上
乃至合成樹脂内層P1の内面へ吐出することによ
つても得られる。 The synthetic resin inner layer P 1 and the synthetic resin outer layer P 2 heat-fused in this manner pass through the outer peripheral portion of the cylindrical body 4 as the mold 1 travels. In that case, as clearly shown in FIG. 2, the outer peripheral surface of the cylindrical body 4 comes into contact with the inner surface of the synthetic resin inner layer P1 , and
Retain P 1 . At this time, the first extrusion passage 22a
If the synthetic resin inner layer P 1 extruded from the synthetic resin outer layer P 2 is thermally fused to the synthetic resin outer layer P 2 in a desired state, the inner diameter of the synthetic resin inner layer P 1 will be almost the same as the outer diameter of the cylindrical body 4. Because of this, the undulations on the inner peripheral surface of the synthetic resin inner layer P1 are corrected to be flat. Also,
If the synthetic resin inner layer P 1 is not heat-sealed to the synthetic resin outer layer P 2 in the desired state, for example, the thickness of the synthetic resin inner layer P 1 is uneven, and the heat-sealing state of various parts in the circumferential direction is uneven. If the thickness is uniform, the synthetic resin inner layer P1 comes into contact with the cylindrical body 4 and its thickness is corrected to be uniform, so that the heat-sealed state is corrected to be uniform. At this time, the synthetic resin inner layer
Correcting the waviness and wall thickness of the inner circumferential surface of P1 is for very small corrections, and large waviness or large differences in wall thickness cannot be adjusted here. The illustrated cylindrical body 4 has a tapered surface 41 at its rear end, and this tapered surface 41 serves as a guide for drawing the synthetic resin inner layer P 1 into the outer circumference of the cylindrical body 4. Since the synthetic resin inner layer P1 is attached to the rear end of the shaped body 4, the synthetic resin will not stay in a lump shape. In addition, if the cylindrical body 4 is made of a material whose surface has been treated with lubricity such as Teflon treatment, the inner layer of the synthetic resin in the molten state can be
There is an advantage that P 1 does not adhere to the cylindrical body 4, and the smoothness of the inner surface thereof is further improved. Such advantages can also be obtained by discharging the lubricant from the lubricant discharge hole 24 onto the outer peripheral surface of the cylindrical body 4 or onto the inner surface of the synthetic resin inner layer P1 .
このように筒状体４の作用によつて均一な状態
に熱融着された合成樹脂内層P1と合成樹脂外層
P2は成形型１の走行に伴つて、次に冷却部３の
周囲へ導かれ、この部分を通過することによつて
冷却されて硬化し、その後離形される。こうして
得られた成形品においては、上述した合成樹脂外
層P2が凹凸状の外壁となり、合成樹脂内層P1が
内壁となつている。 In this way, the synthetic resin inner layer P1 and the synthetic resin outer layer are uniformly heat-sealed by the action of the cylindrical body 4.
As the mold 1 moves, the P 2 is then guided around the cooling section 3, passes through this section to be cooled and hardened, and is then released from the mold. In the molded product thus obtained, the above-described outer synthetic resin layer P 2 serves as an uneven outer wall, and the inner synthetic resin layer P 1 serves as an inner wall.
なお、上記した実施例では凹凸状の外壁を備え
たコルゲート二重壁管を製造する装置について説
明したが、これに限らず、例えば外壁の内面全面
に内壁を熱融着させてなる二重壁管を製造するこ
とも可能である。この場合は成形型の筒状の成形
面を外壁の外面形状に応じたものにすることを要
する。また、筒状体の内部に冷却水を循環させる
ようにしてこの筒状体に接触する合成樹脂内層を
徐冷してもよい。このようにすれば合成樹脂内層
が筒状体に付着しにくくなる利点がある。 Although the above-mentioned embodiment describes an apparatus for manufacturing a corrugated double-walled pipe having an uneven outer wall, the present invention is not limited to this, and for example, a double-walled pipe made by heat-sealing an inner wall to the entire inner surface of an outer wall is used. It is also possible to manufacture tubes. In this case, it is necessary to make the cylindrical molding surface of the mold to correspond to the outer surface shape of the outer wall. Alternatively, the synthetic resin inner layer in contact with the cylindrical body may be slowly cooled by circulating cooling water inside the cylindrical body. This has the advantage that the synthetic resin inner layer is less likely to adhere to the cylindrical body.
以上詳述したところから明らかなように、本発
明による二重壁管の製造装置によれば、成形面上
への合成樹脂外層の押し出し、合成樹脂外層の内
面への合成樹脂内層の押し出しと熱融着、筒状体
による合成樹脂内層の矯正、冷却硬化の各工程が
順次行われ、そのうち筒状体による合成樹脂内層
の矯正工程においては、合成樹脂内層の内面に筒
状体の外周面を接触させる方式が採られるので、
合成樹脂内層がいびつに変形していたりその周方
向のわずかな肉厚に差がある場合であつてもそれ
らが確実かつ適正に合成樹脂外層との熱融着状態
が均一なものになる。また、合成樹脂内層の内面
のうねりも平坦に修正される。したがつて冒頭で
説明した空気圧力を利用して熱融着を行わせるも
のに比べて高品質の二重壁管を製造することがで
きるようになる。なお、上記した効果は、筒状体
を実施例で説明したように合成樹脂押出部から出
た合成樹脂内層がその押し出し直後に通過する位
置に設けておくことにより一層顕著に奏される。 As is clear from the detailed description above, the double-walled tube manufacturing apparatus according to the present invention can extrude the outer synthetic resin layer onto the molding surface, extrude the inner synthetic resin layer onto the inner surface of the outer synthetic resin layer, and heat the pipe. The steps of fusing, straightening the synthetic resin inner layer using the cylindrical body, and cooling hardening are performed in sequence.In the straightening process of the synthetic resin inner layer using the cylindrical body, the outer peripheral surface of the cylindrical body is attached to the inner surface of the synthetic resin inner layer. Since a contact method is adopted,
Even if the synthetic resin inner layer is distorted or there is a slight difference in thickness in the circumferential direction, the state of thermal fusion between the inner synthetic resin layer and the outer synthetic resin layer can be ensured and properly maintained. Further, the undulations on the inner surface of the synthetic resin inner layer are also corrected to be flat. Therefore, it is possible to manufacture a double-walled pipe of higher quality than in the case where heat fusion is performed using air pressure as explained at the beginning. Note that the above-mentioned effects can be more prominently produced by providing the cylindrical body at a position through which the synthetic resin inner layer coming out of the synthetic resin extrusion section passes immediately after extrusion, as described in the embodiments.
第１図は本発明実施例による二重壁管の製造装
置の一部を切欠いて示す側面図、第２図は第１図
のＡ部を拡大した断面図である。
１……成形型、１１……成形面、２……合成樹
脂押出部、３……冷却部、４……筒状体。
FIG. 1 is a partially cutaway side view of a double-walled pipe manufacturing apparatus according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of section A in FIG. 1. DESCRIPTION OF SYMBOLS 1... Molding die, 11... Molding surface, 2... Synthetic resin extrusion part, 3... Cooling part, 4... Cylindrical body.
Claims (1)
形型１の内部に二重壁管の外壁となる合成樹脂外
層P2と内壁となる合成樹脂内層P1とを押し出す
合成樹脂押出部２を設けると共に、この合成樹脂
押出部２の前部に冷却部３を設け、上記成形面１
１上に押し出された合成樹脂外層P2の内面に合
成樹脂内層P1を押し出して両層P1，P2を熱融着
させた後、上記冷却部３により冷却するように構
成した二重壁管の製造装置において、 合成樹脂押出部２は、その外周に形成された凹
陥部２１と、凹陥部２１の前部で円環状に開口す
る溶融合成樹脂の第１押出通路２２ａと、凹陥部
２１の後部で円環状に開口する溶融合成樹脂の第
２押出通路２２ｂと、第２押出通路２２ｂから押
し出された合成樹脂外層P2の内側で凹陥部２１
に向けて開口する給気路２３ｂと、第１押出通路
２２ａから押し出された合成樹脂内層P1と上記
成形面１１で成形されている合成樹脂外層P2と
の間の空間に向けて開口する排気路２３ａと、を
備えていると共に、凹陥部２１と排気路２３ａの
開口との間の部分が成形面１１で成形されている
合成樹脂外層P2の内面に面し、 この合成樹脂押出部２と冷却部３との間に、合
成樹脂内層P1の内面に接触して該合成樹脂内層
P1を保形する筒状体４を設けたことを特徴とす
る二重壁管の製造装置。[Claims] 1. A synthetic resin outer layer P 2 that will become the outer wall of the double-walled tube and a synthetic resin inner layer P 1 that will become the inner wall are placed inside a mold 1 that is equipped with a cylindrical molding surface 11 that is continuously moved. A synthetic resin extrusion section 2 for extrusion is provided, and a cooling section 3 is provided at the front of this synthetic resin extrusion section 2 to cool the molding surface 1.
The synthetic resin inner layer P 1 is extruded onto the inner surface of the synthetic resin outer layer P 2 extruded onto the synthetic resin outer layer P 1 , and both layers P 1 and P 2 are thermally fused, and then cooled by the cooling section 3. In the wall tube manufacturing apparatus, the synthetic resin extrusion part 2 includes a concave part 21 formed on its outer periphery, a first extrusion passage 22a for molten synthetic resin that opens in an annular shape at the front part of the concave part 21, and a concave part. A second extrusion passage 22b for the molten synthetic resin opens in an annular shape at the rear of the molten resin 21, and a concave portion 21 is formed inside the synthetic resin outer layer P2 extruded from the second extrusion passage 22b.
The air supply passage 23b opens toward the space between the synthetic resin inner layer P1 extruded from the first extrusion passage 22a and the synthetic resin outer layer P2 molded on the molding surface 11. an exhaust passage 23a, and a portion between the recessed part 21 and the opening of the exhaust passage 23a faces the inner surface of the synthetic resin outer layer P2 molded with the molded surface 11 , and this synthetic resin extruded part 2 and the cooling part 3, the synthetic resin inner layer P1 is in contact with the inner surface of the synthetic resin inner layer P1.
A device for manufacturing a double-walled pipe, characterized in that it is provided with a cylindrical body 4 that retains the shape of P1 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58232405A JPS60124240A (en) | 1983-12-08 | 1983-12-08 | Preparation of double wall tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58232405A JPS60124240A (en) | 1983-12-08 | 1983-12-08 | Preparation of double wall tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60124240A JPS60124240A (en) | 1985-07-03 |
| JPH0336020B2 true JPH0336020B2 (en) | 1991-05-30 |
Family
ID=16938725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58232405A Granted JPS60124240A (en) | 1983-12-08 | 1983-12-08 | Preparation of double wall tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60124240A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4846660A (en) * | 1984-07-18 | 1989-07-11 | Contech Construction Products Inc. | Apparatus for producing double wall pipe |
| US5296188A (en) * | 1992-01-14 | 1994-03-22 | Corma, Inc. | Methods for forming tubing utilizing suction and pneumatic pressure at the surface of the cooling plug |
| DE4210482A1 (en) * | 1992-03-31 | 1993-10-07 | Wilhelm Hegler | Method and device for the continuous production of a composite pipe with a pipe socket |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5143497A (en) * | 1974-10-12 | 1976-04-14 | Toray Industries |
-
1983
- 1983-12-08 JP JP58232405A patent/JPS60124240A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5143497A (en) * | 1974-10-12 | 1976-04-14 | Toray Industries |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60124240A (en) | 1985-07-03 |
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