JPH0149105B2 - - Google Patents
Info
- Publication number
- JPH0149105B2 JPH0149105B2 JP59264520A JP26452084A JPH0149105B2 JP H0149105 B2 JPH0149105 B2 JP H0149105B2 JP 59264520 A JP59264520 A JP 59264520A JP 26452084 A JP26452084 A JP 26452084A JP H0149105 B2 JPH0149105 B2 JP H0149105B2
- Authority
- JP
- Japan
- Prior art keywords
- billet
- fluororesin
- mold
- extrusion molding
- solid
- 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
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
- B29C48/94—Lubricating
-
- 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
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- 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
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/475—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using pistons, accumulators or press rams
-
- 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
- B29C48/94—Lubricating
- B29C48/95—Lubricating by adding lubricant to the moulding material
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
（発明の技術分野）
本発明は、合成樹脂の固相押出成形方法に関
し、特に潤滑剤の改良に関する。DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a method for solid phase extrusion molding of synthetic resins, and particularly to improvements in lubricants.
（従来技術）
合成樹脂の固相押出成形方法は、素材ビレツト
をガラス転移点以上、融点以下の温度に加熱し、
ラムや静水圧で加圧して素材ビレツトを金型に通
し、この過程で素材ビレツトを固相状態のまま塑
性変形させて所望の断面形状を有する成形物を得
る方法であり、寸法精度を向上させることができ
るため、最近注目されている。(Prior art) The solid phase extrusion molding method for synthetic resins involves heating a material billet to a temperature above the glass transition point and below the melting point.
This is a method in which the billet material is passed through a mold by applying pressure using a ram or hydrostatic pressure, and during this process the billet material is plastically deformed in a solid state to obtain a molded product with the desired cross-sectional shape, improving dimensional accuracy. It has recently been attracting attention because of its ability to
上記の固相押出成形方法の内ラム押出法におい
て、素材ビレツトと金型との間の接触摩擦が大き
ため、次の不都合が生じる。第１に、成形物の表
面の平滑性が低下する。第２に、押出荷重が大き
く成形速度を速くすることができない。成形速度
を速めようとすると押出荷重がさらに増大する。
第３に、素材ビレツトと金型との間の摩擦が大き
いため、複雑な断面形状の成形物を成形すること
ができない。なぜなら、単位接触面積当たりの押
出荷重が大きいため、複雑な断面形状をもつ成形
物の場合、押出荷重が限界荷重を越えてしまうか
らである。 In the inner ram extrusion method of the solid phase extrusion method described above, the following disadvantages occur because the contact friction between the material billet and the mold is large. First, the smoothness of the surface of the molded product decreases. Secondly, the extrusion load is large and the molding speed cannot be increased. If an attempt is made to increase the molding speed, the extrusion load will further increase.
Thirdly, since the friction between the billet material and the mold is large, it is not possible to mold a molded product with a complicated cross-sectional shape. This is because the extrusion load per unit contact area is large, so in the case of a molded product with a complicated cross-sectional shape, the extrusion load will exceed the limit load.
そこで、通常は素材ビレツトと金型との間に潤
滑剤を介在させて固相押出成形を行なつている。
従来の潤滑剤には、ステアリン酸の金属塩等の直
鎖脂肪族塩、ワツクス、グリセリン、シリコンオ
イル（以下これらを総称して油脂系潤滑剤と称す
る）が用いられている。また、二硫化モリブデン
等の硬い金属化合物粒子を油脂に分散させたもの
も用いられている。 Therefore, solid phase extrusion molding is usually performed with a lubricant interposed between the billet material and the mold.
Conventional lubricants include linear aliphatic salts such as metal salts of stearic acid, wax, glycerin, and silicone oil (hereinafter collectively referred to as oil-based lubricants). Also used are hard metal compound particles such as molybdenum disulfide dispersed in oil and fat.
上記油脂系の潤滑剤では、固相押出時の高圧力
により油膜が薄くなり過ぎたり切れて潤滑効果を
十分に発揮できなかつた。特に上記第２、第３の
不都合を十分に解消できなかつた。さらに、素材
ビレツトを構成する合成樹脂の種類と油脂系潤滑
剤の種類の組み合わせによつては、油脂系潤滑剤
の一部が素材ビレツトへ浸透し、押出成形時に割
れが生じる等の欠点もあり、成形素材ごとに好ま
しい潤滑剤を選定しなければならない。 With the above-mentioned oil-based lubricants, the oil film becomes too thin or breaks due to the high pressure during solid phase extrusion, and the lubricating effect cannot be sufficiently exerted. In particular, the second and third disadvantages mentioned above could not be sufficiently resolved. Furthermore, depending on the combination of the type of synthetic resin and the type of oil-based lubricant that make up the material billet, some of the oil-based lubricant may penetrate into the material billet, causing cracks during extrusion molding. , a suitable lubricant must be selected for each molding material.
また、金属粒子分散型の潤滑剤では、合成樹脂
からなる素材ビレツトの表面硬度が低いので、金
属粒子が素材ビレツトの表面に食い込んでしま
い、潤滑効果が十分でなかつた。 Furthermore, in the metal particle-dispersed lubricant, since the surface hardness of the material billet made of synthetic resin is low, the metal particles dig into the surface of the material billet, resulting in insufficient lubrication effect.
（発明の目的）
本発明は上記事情に基づきなされたもので、そ
の目的は、素材ビレツトと金型との間の接触摩擦
を十分に低下させることができ、これにより成形
物の表面平滑性の改善、押出荷重の低下、成形速
度の向上を図ることができるとともに、成形物の
断面積の増大、断面形状の複雑化も可能となる合
成樹脂の固相押出成形方法を提供することにあ
る。(Object of the invention) The present invention was made based on the above circumstances, and its object is to sufficiently reduce the contact friction between the billet material and the mold, thereby improving the surface smoothness of the molded product. It is an object of the present invention to provide a method for solid-phase extrusion molding of synthetic resins, which can improve the extrusion load, reduce the extrusion load, and improve the molding speed, as well as increase the cross-sectional area and complicate the cross-sectional shape of the molded product.
（発明の要旨）
本発明の要旨は、合成樹脂からなる素材ビレツ
トと金型との間に、フツ素樹脂の微粒子を介在さ
せて、固相押出成形することを特徴とする合成樹
脂の固相押出成形方法にある。(Summary of the Invention) The gist of the present invention is to provide a solid phase extrusion molding method of a synthetic resin characterized in that solid phase extrusion molding is carried out by interposing fine particles of fluororesin between a material billet made of synthetic resin and a mold. In the extrusion molding method.
（発明の構成） 以下、本発明を説明する。(Structure of the invention) The present invention will be explained below.
フツ素樹脂微粒子
フツ素樹脂としては、ポリ４フツ化エチレン、
ポリ６フツ化プロピレン等を用いる。また、４フ
ツ化エチレンや６フツ化プロピレンを構成単位と
する共重合体を用いてもよい。また、素材に浸透
しないものであれば、従来使用されていた潤滑剤
も併用することができる。Fluorine resin fine particles Fluorine resins include polytetrafluoroethylene,
Polypropylene hexafluoride or the like is used. Further, a copolymer having tetrafluoroethylene or hexafluoropropylene as a constituent unit may also be used. In addition, conventionally used lubricants can also be used as long as they do not penetrate into the material.
フツ素樹脂の分子量については特に制限はない
が、分子量の低いもの程効果が大きい。 There is no particular restriction on the molecular weight of the fluororesin, but the lower the molecular weight, the greater the effect.
フツ素樹脂の粒子径は、金型の表面粗さや素材
ビレツトの表面粗さに関係して決定される。すな
わち、粒子径が金型の表面粗さや素材ビレツトの
表面粗さより大きいと、金型内面や素材ビレツト
表面の微小の凹凸を埋めることができず、潤滑効
果が低下するからである。したがつて、フツ素樹
脂の１次粒子径を、金型表面、素材ビレツトの表
面粗さより小さくする。表面粗さは、中心線平均
粗さRaをとる。なお、金型の表面粗さと素材ビ
レツトの表面粗さが異なる場合には、細かい方の
表面粗さより小さくする。金型および素材ビレツ
トの表面粗さは通常10μ以下であるから、１次粒
子径も通常10μ以下にする。２次あるいはさらに
高次の粒子径は大きくてもよい。後述の押出成形
時の圧力により２次以上の粒子が容易に潰されて
１次粒子になるからである。 The particle size of the fluororesin is determined in relation to the surface roughness of the mold and the material billet. That is, if the particle size is larger than the surface roughness of the mold or the billet material, it will not be possible to fill in minute irregularities on the inner surface of the mold or the surface of the billet material, and the lubricating effect will be reduced. Therefore, the primary particle diameter of the fluororesin is made smaller than the surface roughness of the mold surface and the material billet. The surface roughness is the center line average roughness Ra. In addition, if the surface roughness of the mold and the surface roughness of the material billet are different, the finer surface roughness should be smaller than the finer one. Since the surface roughness of the mold and material billet is usually 10μ or less, the primary particle size is also usually 10μ or less. The secondary or higher order particle size may be large. This is because secondary and higher-order particles are easily crushed into primary particles by the pressure during extrusion molding, which will be described later.
潤滑剤を併用する場合、潤滑剤としては、前述
したワツクス、グリセリン、シリコンオイル等の
油脂系潤滑剤を用いてもよい。 When a lubricant is used in combination, the lubricant may be an oil-based lubricant such as the wax, glycerin, or silicone oil described above.
フツ素樹脂粒子の付着
フツ素樹脂微粒子を素材ビレツトの表面に一様
に付着させる。なお、フツ素樹脂微粒子を金型の
表面に付着させてもよい。素材ビレツトの表面に
予めワツクス、グリセリン、シリコンオイル等の
油脂系潤滑剤を一様に付着させ、この後フツ素樹
脂の微粒子を付着させてもよい。この場合、フツ
素樹脂の微粒子をより確実にかつ一様に付着させ
ることができる。Attachment of fluororesin particles The fluororesin fine particles are uniformly attached to the surface of the material billet. Note that fluororesin fine particles may be attached to the surface of the mold. An oil-based lubricant such as wax, glycerin, silicone oil, etc. may be uniformly applied to the surface of the material billet in advance, and then fine particles of fluororesin may be applied. In this case, the fine particles of fluororesin can be more reliably and uniformly attached.
フツ素樹脂の粒子の付着量は、0.0001ｇ／cm2以
上であればよいが、0.01ｇ／cm2〜0.1ｇ／cm2の範
囲が好ましい。 The amount of adhered fluororesin particles may be 0.0001 g/cm 2 or more, but is preferably in the range of 0.01 g/cm 2 to 0.1 g/cm 2 .
固相押出成形
素材ビレツトをラムで加圧して、金型を通過さ
せ固相状態で押出成形する。この固相成形は、素
材ビレツトを構成する合成樹脂のガラス転移点以
上、融点以下の温度範囲内で行なわれる。上記成
形の際、フツ素樹脂の微粒子は潰されて薄膜状と
なり成形物の表面を覆う。この薄膜は成形後に容
易に剥がすことができる。Solid-phase extrusion molding The billet material is pressurized with a ram, passed through a mold, and extruded in a solid-phase state. This solid phase molding is carried out within a temperature range above the glass transition point and below the melting point of the synthetic resin constituting the material billet. During the above molding, the fine particles of the fluororesin are crushed into a thin film that covers the surface of the molded product. This thin film can be easily peeled off after molding.
フツ素樹脂の微粒子を用いることによつて、素
材ビレツトと金型との間の接触摩擦を大幅に減少
させることができる。この結果、成形物の表面の
平滑性及び均一性を改善できる。また、従来の潤
滑剤を用いた場合に比較して、成形速度を同程度
にした場合に、押出荷重を30〜50％程度低下させ
ることができる。換言すれば、同程度の押出荷重
で成形速度を大幅に向上させることができる。ま
た、単位接触面積当たりの押出荷重を軽減できる
ので、制約された押出荷重の範囲内で、素材ビレ
ツトと金型との間の接触面積を増大させることも
可能となり、断面形状を複雑にすることもでき
る。 By using fine particles of fluororesin, the contact friction between the billet material and the mold can be significantly reduced. As a result, the smoothness and uniformity of the surface of the molded article can be improved. Furthermore, compared to the case where a conventional lubricant is used, the extrusion load can be reduced by about 30 to 50% when the molding speed is kept at the same level. In other words, the molding speed can be significantly improved with the same extrusion load. In addition, since the extrusion load per unit contact area can be reduced, it is possible to increase the contact area between the billet material and the die within the limited extrusion load range, making it possible to make the cross-sectional shape more complex. You can also do it.
実験例 １（比較例）
素材ビレツトとしてポリアセタールの丸棒（直
径48mm、長さ40cm）を用い、これをシリコンオイ
ル中で140℃に予備加熱した。次に、上記シリコ
ンオイルが表面に一様に付着した状態で、素材ビ
レツトをラム式固相押出機の加熱シリンダーに装
填した。素材ビレツトが加熱シリンダー内で一様
に140℃に達した時、ラムによつて素材ビレツト
を加圧し、加熱シリンダーの前部に設けられてい
る金型（出口内径20mm）の中へ押し込んで成形し
た。この押出成形時に、成形速度を20cm／minに
したところ、ラムにかかる荷重は200MPaであつ
た。Experimental Example 1 (Comparative Example) A polyacetal round rod (diameter 48 mm, length 40 cm) was used as a billet material, and was preheated to 140°C in silicone oil. Next, with the silicone oil uniformly adhered to the surface, the billet material was loaded into a heating cylinder of a ram solid phase extruder. When the billet material reaches a uniform temperature of 140℃ in the heating cylinder, the billet material is pressurized by a ram and pressed into the mold (outlet inner diameter 20 mm) installed at the front of the heating cylinder to form it. did. During this extrusion molding, when the molding speed was set to 20 cm/min, the load applied to the ram was 200 MPa.
実験例 ２（本発明方法）
実験例１と同様に、素材ビレツトとしてポリア
セタールの丸棒（外径48mm、長さ40cm）を用い、
これをシリコンオイル中で140℃に予備加熱した。
次に、上記シリコンオイルが素材ビレツトの表面
に一様に付着した状態で、さらにポリ４フツ化エ
チレンの微粒子（１次粒子径0.4μ〜0.2μ）を一様
に付着させた。このポリ４フツ化エチレンの付着
量は0.06ｇ／cm2にした。その後実験例１と同様の
プロセスで直径20mmの丸棒を成形した。この押出
成形時に、成形速度を20cm／minにしたところ、
ラムにかかる荷重は110MPaであつた。また、表
面状態は良好であつた。Experimental Example 2 (method of the present invention) As in Experimental Example 1, a polyacetal round rod (outer diameter 48 mm, length 40 cm) was used as the material billet.
This was preheated to 140°C in silicone oil.
Next, while the silicone oil was uniformly adhered to the surface of the material billet, fine particles of polytetrafluoroethylene (primary particle diameter 0.4 .mu.m to 0.2 .mu.m) were further uniformly adhered to the surface of the billet material. The amount of polytetrafluoroethylene deposited was 0.06 g/cm 2 . Thereafter, a round bar with a diameter of 20 mm was formed using the same process as in Experimental Example 1. When the molding speed was set to 20cm/min during this extrusion molding,
The load on the ram was 110 MPa. Moreover, the surface condition was good.
本発明の実験例２は、実験例１と比較してラム
による押出荷重を約50％まで低下させることがで
きた。 Experimental Example 2 of the present invention was able to reduce the extrusion load by the ram by about 50% compared to Experimental Example 1.
（発明の効果）
以上説明したように、本発明によれば、フツ素
樹脂の微粒子を用いることにより、素材ビレツト
と金型との間の接触摩擦を十分に低下させること
ができ、これにより成形物の表面平滑性の改善、
押出荷重の低下、成形速度の向上を図ることがで
きるとともに、成形物の断面積の増大、断面形状
の複雑化も可能となる。(Effects of the Invention) As explained above, according to the present invention, by using fine particles of fluororesin, it is possible to sufficiently reduce the contact friction between the material billet and the mold. Improving the surface smoothness of objects,
It is possible to reduce the extrusion load and improve the molding speed, and it also becomes possible to increase the cross-sectional area and complicate the cross-sectional shape of the molded product.
Claims (1)
に、フツ素樹脂の微粒子を介在させて、固相押出
成形することを特徴とする合成樹脂の固相押出成
形方法。 ２ 前記フツ素樹脂として、ポリ４フツ化エチレ
ンを用いることを特徴とする特許請求の範囲第１
項に記載の合成樹脂の固相押出成形方法。 ３ 前記フツ素樹脂として、ポリ６フツ化プロピ
レンを用いることを特徴とする特許請求の範囲第
１項に記載の合成樹脂の固相押出成形方法。 ４ 前記フツ素樹脂の１次粒子径を、金型および
素材ビレツトの中心線平均粗さ（Ra）のうち、
細かい方の粗さよりも小さくしたことを特徴とす
る特許請求の範囲第１項に記載の合成樹脂の固相
押出成形方法。[Scope of Claims] 1. A method for solid-phase extrusion molding of synthetic resins, characterized in that solid-phase extrusion molding is carried out with fine particles of fluororesin interposed between a material billet made of synthetic resin and a mold. 2. Claim 1, characterized in that polytetrafluoroethylene is used as the fluororesin.
Solid-phase extrusion molding method for synthetic resins as described in . 3. The method for solid phase extrusion molding of a synthetic resin according to claim 1, wherein polypropylene hexafluoride is used as the fluororesin. 4. The primary particle diameter of the fluororesin is determined by the center line average roughness (Ra) of the mold and the material billet.
The solid phase extrusion molding method for a synthetic resin according to claim 1, wherein the roughness is smaller than the finer roughness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59264520A JPS61143114A (en) | 1984-12-17 | 1984-12-17 | Method for solid phase extrusion of synthetic resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59264520A JPS61143114A (en) | 1984-12-17 | 1984-12-17 | Method for solid phase extrusion of synthetic resin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61143114A JPS61143114A (en) | 1986-06-30 |
| JPH0149105B2 true JPH0149105B2 (en) | 1989-10-23 |
Family
ID=17404390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59264520A Granted JPS61143114A (en) | 1984-12-17 | 1984-12-17 | Method for solid phase extrusion of synthetic resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61143114A (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4266919A (en) * | 1979-08-09 | 1981-05-12 | E. I. Du Pont De Nemours And Company | Ram-extrusion apparatus for non-melt fabricable polymeric resins |
-
1984
- 1984-12-17 JP JP59264520A patent/JPS61143114A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61143114A (en) | 1986-06-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |