JPH0250850B2 - - Google Patents
Info
- Publication number
- JPH0250850B2 JPH0250850B2 JP57213370A JP21337082A JPH0250850B2 JP H0250850 B2 JPH0250850 B2 JP H0250850B2 JP 57213370 A JP57213370 A JP 57213370A JP 21337082 A JP21337082 A JP 21337082A JP H0250850 B2 JPH0250850 B2 JP H0250850B2
- Authority
- JP
- Japan
- Prior art keywords
- crosshead
- penetrator
- cylinder
- mandrel guide
- vacuum
- 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
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
- 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
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
- B29C48/34—Cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding material and the preform to be coated
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
本発明は、押出機の真空クロスヘツドに関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vacuum crosshead for an extruder.
従来、押出機のクロスヘツドとしては、適宜な
位置に排気口を有するシリンダーと該シリンダー
の後端に嵌合された中空マンドレルガイドと該シ
リンダーの先端に設けられた切頭円錐状の中空を
有するニツプルとからなるものが知られている。 Conventionally, the crosshead of an extruder consists of a cylinder having an exhaust port at an appropriate position, a hollow mandrel guide fitted to the rear end of the cylinder, and a nipple having a truncated conical hollow provided at the tip of the cylinder. It is known that it consists of
この装置を第１図に基づいて説明する。 This device will be explained based on FIG.
マンドレルあるいは内ゴム層等の貫通子１２を
マンドレルガイド８から送り込み、シリンダー２
の中空部を通りニツプル６の先端から送り出す。
ニツプル６の先端には間隔を置いてダイス１８が
配置されており、そこでクロスヘツド本体１４か
らのゴムが貫通子１２表面上に押し出され、貫通
子１２表面上にカバーゴム層が形成される。 A penetrator 12 such as a mandrel or an inner rubber layer is fed through the mandrel guide 8, and the cylinder 2
It passes through the hollow part of and is sent out from the tip of the nipple 6.
A die 18 is disposed at a distance at the tip of the nipple 6, and the rubber from the crosshead body 14 is extruded onto the surface of the penetrator 12 to form a cover rubber layer on the surface of the penetrator 12.
貫通子１２がクロスヘツド３０内部を貫通して
いるときに、シリンダー２の排気口１６からポン
プ（図示せず）にて排気を行なう。これによりク
ロスヘツド３０内部を真空にし、貫通子１２の表
面上の空気を除去する。 While the penetrator 12 is passing through the inside of the crosshead 30, exhaust is performed from the exhaust port 16 of the cylinder 2 using a pump (not shown). This creates a vacuum inside the crosshead 30 and removes air on the surface of the penetrator 12.
しかし従来のこの種の真空装置にあつては、貫
通子１２の外形寸法にバラツキがあるときはマン
ドレルガイド８と貫通子１２との間にすきまが生
じ、クロスヘツド３０内の真空度が低下する。そ
の結果、貫通子１２表面に空気が残存し、その上
にカバーゴム層を形成すると、貫通子１２とカバ
ーゴム層との密着性が悪くなる。 However, in the conventional vacuum apparatus of this type, when there are variations in the outer dimensions of the penetrator 12, a gap is created between the mandrel guide 8 and the penetrator 12, and the degree of vacuum in the crosshead 30 is reduced. As a result, if air remains on the surface of the penetrator 12 and a cover rubber layer is formed thereon, the adhesion between the penetrator 12 and the cover rubber layer will deteriorate.
特に、貫通子１２が第３図に示すような内ゴム
層２０に補強糸２２を巻着したものである場合に
は、交錯する補強糸によつて形成される網目部２
４に空気が残存しやすいためこの傾向が著しい。 In particular, when the penetrator 12 is made by winding reinforcing threads 22 around an inner rubber layer 20 as shown in FIG. 3, the mesh portion 2 formed by the intersecting reinforcing threads
This tendency is remarkable because air tends to remain in the 4.
本発明は従来の押出機の真空クロスヘツドのこ
のような欠点を改良することを目的としてなされ
たものである。 The present invention has been made with the object of improving these drawbacks of the vacuum crosshead of conventional extruders.
本発明の押出機の真空クロスヘツドは、適宜な
位置に排気口１６を有するシリンダー２と、シリ
ンダー２の後端に嵌合された中空マンドレルガイ
ド８と、シリンダー２の先端に設けられた切頭円
錐状の中空を有するニツプル６とからなり、ニツ
プル６の先端がクロスヘツド本体１４に取り付け
られたダイス１８と対向するようにクロスヘツド
本体１４に中子４を介して保持されている、押出
機の真空クロスヘツドにおいて、マンドレルガイ
ド８は貫通子１２の最大の外径と同一又はやや大
きな内径の通孔を有し、貫通子１２の最小の外径
と同一又はやや小さな内径の通孔を有する弾性ス
ペーサー１０を、マンドレルガイド８の通孔と同
軸上で且つマンドレルガイド８のシリンダー２側
側面に固着させたことを特徴とする押出機の真空
クロスヘツドである。 The vacuum crosshead of the extruder of the present invention includes a cylinder 2 having an exhaust port 16 at an appropriate position, a hollow mandrel guide 8 fitted to the rear end of the cylinder 2, and a truncated cone provided at the tip of the cylinder 2. A vacuum crosshead for an extruder is comprised of a nipple 6 having a hollow shape, and is held in a crosshead body 14 via a core 4 so that the tip of the nipple 6 faces a die 18 attached to the crosshead body 14. , the mandrel guide 8 has a through hole with an inner diameter that is the same as or slightly larger than the maximum outer diameter of the penetrator 12, and an elastic spacer 10 that has a through hole with an inner diameter that is the same as or slightly smaller than the minimum outer diameter of the penetrator 12. , is a vacuum crosshead for an extruder characterized in that it is coaxial with the through hole of the mandrel guide 8 and fixed to the side surface of the mandrel guide 8 on the side of the cylinder 2.
本発明に係るマンドレルガイド８の形状は、弾
性スペーサー１０と固着した場合の相互の密着性
を考えて中空円盤状にする。また通孔内径は、貫
通子１２の外径のバラツキを考え、その最大の外
径と予想されるものと同一又はやや大きくする。 The shape of the mandrel guide 8 according to the present invention is a hollow disk in consideration of mutual adhesion when fixed to the elastic spacer 10. Further, the inner diameter of the through hole is set to be the same as or slightly larger than the expected maximum outer diameter, taking into account the variation in the outer diameter of the penetrator 12.
本発明に係る弾性スペーサー１０の内径は、貫
通子１２の外径のバラツキを考え、その最大の外
径と予想されるものと同一又はやや小さくする。
このように弾性スペーサー１０は、内径が貫通子
の外径と同一又はやや小さい弾性材からなるの
で、新たに貫通子１２を挿入する際に、貫通子先
端により内周部付近が傷付くことを防ぐため、ま
た貫通子先端が内周部付近を噛み込むことにより
内径が縮小し貫通子の挿入が困難となるのを防ぐ
ため、マンドレルガイド８のシリンダー２側側面
に設ける。 The inner diameter of the elastic spacer 10 according to the present invention is set to be the same as or slightly smaller than the expected maximum outer diameter, considering the variation in the outer diameter of the penetrator 12.
In this way, the elastic spacer 10 is made of an elastic material whose inner diameter is the same as or slightly smaller than the outer diameter of the penetrator, so when inserting a new penetrator 12, the tip of the penetrator does not damage the vicinity of the inner circumference. The mandrel guide 8 is provided on the side surface of the cylinder 2 side in order to prevent the tip of the penetrator from biting the vicinity of the inner periphery, thereby reducing the inner diameter and making it difficult to insert the penetrator.
弾性スペーサー１０の材質は、貫通子１２の外
径のバラツキの範囲で伸縮可能な弾性材ならばそ
の種類は問わない。経済性等を考えた場合天然ゴ
ムが好ましい。 The material of the elastic spacer 10 is not limited to any type as long as it is an elastic material that can be expanded and contracted within the range of variation in the outer diameter of the penetrator 12. Natural rubber is preferable in terms of economy and the like.
弾性スペーサー１０をマンドレルガイド８のシ
リンダー２側側面に固着する際の固着手段は特に
限定されない。実施例においては弾性スペーサー
１０に孔を設けネジ取めしてある。 The means for fixing the elastic spacer 10 to the side surface of the mandrel guide 8 on the cylinder 2 side is not particularly limited. In the embodiment, holes are provided in the elastic spacer 10 and screws are attached to the elastic spacer 10.
本発明は以上のように構成したので、貫通子１
２の外径にバラツキがあつても、真空クロスヘツ
ド内の真空度の低下を防止でき、貫通子１２表面
の残存空気の除去を十分に行うことが可能であ
り、ひいては、貫通子１２上に密着性のよいカバ
ーゴム層を形成することができる。 Since the present invention is configured as described above, the penetrator 1
Even if there is variation in the outer diameter of the penetrator 12, it is possible to prevent the degree of vacuum inside the vacuum crosshead from decreasing, and it is possible to sufficiently remove residual air on the surface of the penetrator 12. A cover rubber layer with good properties can be formed.
第１図は押出機の真空クロスヘツドの断面図で
ある。第２図は弾性スペーサーの正面図及びＡ−
Ａ断面図である。第３図は貫通子の一例を示す側
面図及びＢ−Ｂ断面図である。
２……シリンダー、４……中子、６……ニツプ
ル、８……マンドレルガイド、１０……弾性スペ
ーサー、１２……貫通子、１４……クロスヘツド
本体、１６……排気口、１８……ダイス、２０…
…内ゴム層、２２……補強糸、２４……網目部、
３０……押出機の真空クロスヘツド。
FIG. 1 is a cross-sectional view of the vacuum crosshead of the extruder. Figure 2 is a front view of the elastic spacer and A-
It is an A sectional view. FIG. 3 is a side view and a BB sectional view showing an example of the penetrator. 2... Cylinder, 4... Core, 6... Nipple, 8... Mandrel guide, 10... Elastic spacer, 12... Penetrator, 14... Crosshead body, 16... Exhaust port, 18... Dice , 20...
...Inner rubber layer, 22...Reinforcement thread, 24...Mesh part,
30...Vacuum crosshead of extruder.
Claims (1)
該シリンダーの後端に嵌合された中空マンドレル
ガイドと、該シリンダーの先端に設けられた切頭
円錐状の中空を有するニツプルとからなり、該ニ
ツプルの先端がクロスヘツド本体に取り付けられ
たダイスと対向するように該クロスヘツド本体に
中子を介して保持されている、押出機の真空クロ
スヘツドにおいて、前記マンドレルガイドは貫通
子の最大の外径と同一又はやや大きな内径の通孔
を有し、貫通子の最小の外径と同一又はやや小さ
な内径の通孔を有する弾性スペーサーを、前記マ
ンドレルガイドの通孔と同軸上で且つ前記マンド
レルガイドの前記シリンダー側側面に固着させた
ことを特徴とする押出機の真空クロスヘツド。1. A cylinder having an exhaust port at an appropriate position,
It consists of a hollow mandrel guide fitted to the rear end of the cylinder, and a nipple having a truncated conical hollow provided at the tip of the cylinder, and the tip of the nipple faces the die attached to the crosshead body. In the vacuum crosshead of an extruder, which is held in the crosshead main body via a core so as to have a core, the mandrel guide has a through hole with an inner diameter that is the same as or slightly larger than the maximum outer diameter of the penetrator. An extruder characterized in that an elastic spacer having a through hole with an inner diameter that is the same as or slightly smaller than the minimum outer diameter of the mandrel guide is fixed coaxially with the through hole of the mandrel guide and to the side surface of the cylinder side of the mandrel guide. vacuum crosshead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57213370A JPS59104920A (en) | 1982-12-07 | 1982-12-07 | Crosshead vacuum apparatus of extruder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57213370A JPS59104920A (en) | 1982-12-07 | 1982-12-07 | Crosshead vacuum apparatus of extruder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59104920A JPS59104920A (en) | 1984-06-18 |
| JPH0250850B2 true JPH0250850B2 (en) | 1990-11-05 |
Family
ID=16638054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57213370A Granted JPS59104920A (en) | 1982-12-07 | 1982-12-07 | Crosshead vacuum apparatus of extruder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59104920A (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49135472U (en) * | 1973-03-26 | 1974-11-21 | ||
| JPS57489U (en) * | 1980-06-03 | 1982-01-05 |
-
1982
- 1982-12-07 JP JP57213370A patent/JPS59104920A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59104920A (en) | 1984-06-18 |
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