JPS6230088B2 - - Google Patents
Info
- Publication number
- JPS6230088B2 JPS6230088B2 JP55151389A JP15138980A JPS6230088B2 JP S6230088 B2 JPS6230088 B2 JP S6230088B2 JP 55151389 A JP55151389 A JP 55151389A JP 15138980 A JP15138980 A JP 15138980A JP S6230088 B2 JPS6230088 B2 JP S6230088B2
- Authority
- JP
- Japan
- Prior art keywords
- groove
- barrel
- screw
- extruder
- foaming
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3442—Mixing, kneading or conveying the foamable material
-
- 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
- B29C48/50—Details of extruders
- B29C48/68—Barrels or cylinders
- B29C48/685—Barrels or cylinders characterised by their inner surfaces, e.g. having grooves, projections or threads
- B29C48/686—Barrels or cylinders characterised by their inner surfaces, e.g. having grooves, projections or threads having grooves or cavities
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Molding Of Porous Articles (AREA)
Description
【発明の詳細な説明】
本発明は膨張剤及び起核剤を配合したスチレン
系樹脂の発泡成形体の製造法に関するものであ
り、高発泡で且つ良質の気泡体を工業的に有利に
製造することを目的とするものである。更の詳し
くは特定の比率の膨張剤即ちブタン換算で対スチ
レン樹脂3.0〜5.0重量％を含んだスチレン系樹脂
を（溝の長さ）／（バレルの直径）、溝間隔、溝
幅、最大溝深さを規定したバレルを有し、且つ特
定した圧縮比のスクリユーを具えた特殊な発泡押
出機により、特定した条件下に発泡押出すること
を特徴とするスチレン系樹脂の発泡押出成形法に
係るものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a foamed molded article of styrene resin containing an expanding agent and a nucleating agent, and it is an industrially advantageous method for manufacturing a highly foamed and high-quality foamed article. The purpose is to In more detail, styrene resin containing a specific ratio of expansion agent, i.e., 3.0 to 5.0% by weight of styrene resin in terms of butane, is applied to (groove length)/(barrel diameter), groove spacing, groove width, maximum groove. Pertaining to a method for foam extrusion molding of styrenic resin, which is characterized by foam extrusion under specified conditions using a special foam extruder equipped with a barrel having a specified depth and a screw having a specified compression ratio. It is something.
近年、石油を原料とするプラスチツク製品に対
して省資源化が志向され、食肉用トレーなどの発
泡体製品についても軽量化が進められんとしてい
る。それに対し、膨張剤を含むスチレン系樹脂を
発泡押出する方法においては膨張剤を樹脂中へ安
定した状態で含浸させ得る量に限度があり、更に
高発泡化させることは困難となつている。 In recent years, efforts have been made to save resources in plastic products made from petroleum, and efforts are being made to reduce the weight of foam products such as meat trays. On the other hand, in the method of foaming and extruding a styrenic resin containing an expanding agent, there is a limit to the amount of expanding agent that can be stably impregnated into the resin, making it difficult to achieve even higher foaming.
高発泡化させる方法として押出温度を上昇させ
る手段が想到されるが、この方法によると高発泡
化はするが出来た気泡が粗らくなり従来通りの品
質を維持することが出来ない欠点を有している。 A method of increasing the extrusion temperature has been considered as a method for achieving high foaming, but although this method achieves high foaming, the resulting bubbles become coarse and the conventional quality cannot be maintained. ing.
本発明者等は発泡倍率が高く且つ気泡の細かい
良質のシートを得るために研究を重ねた結果、バ
レルのフイードゾーンのみに特定条件を具備した
溝を刻んだ押出機を使用し、更にスチレン系樹脂
に対し特定量の膨張剤を加えることによつて気泡
が細かく且つ発泡倍率の高い良質のシートを得る
ことが可能であることを見出した。 As a result of repeated research in order to obtain a high-quality sheet with a high expansion ratio and fine bubbles, the present inventors used an extruder with grooves that meet specific conditions only in the feed zone of the barrel, and also It has been found that by adding a specific amount of an expanding agent to the foam, it is possible to obtain a high-quality sheet with fine cells and a high expansion ratio.
上記目的を達成するために用いる押出機はバレ
ルのフイードゾーンに押出方向に対して直線状で
（溝の長さ）／（バレルの直径）＝1.0〜4.0で先端
に進むに従い溝が浅くなり、しかも溝の最大深さ
が0.5mm〜5.0mmで溝幅が3.0〜30mm、溝間隔5.0〜
50mmという条件を備えた溝を複数個を有し、しか
もその際
スクリユーは最大見掛けの圧縮比＝（バレル径
２−スクリユー根本谷径２）／（バレル径２−ス
クリユーメータリングゾーン谷径２）が1.0〜2.0
になる設計のものを用いることが必要であるが、
スクリユーのピツチを順次変化させてもよい。 The extruder used to achieve the above purpose has a feed zone in the barrel that is linear in the extrusion direction (groove length)/(barrel diameter) = 1.0 to 4.0, and the groove becomes shallower toward the tip. The maximum depth of the groove is 0.5mm~5.0mm, the groove width is 3.0~30mm, and the groove spacing is 5.0~
It has multiple grooves that meet the condition of 50 mm, and in that case, the screw has a maximum apparent compression ratio = (barrel diameter
2 - screw root valley diameter 2 ) / (barrel diameter 2 - screw metering zone valley diameter 2 ) is 1.0 to 2.0
It is necessary to use a product designed to
The pitch of the screw may be changed sequentially.
第１は本発明を実施する場合に使用するバレル
のフイードゾーン部分の中央を断面で示した斜視
図であり、図中１はバレル、２はホツパー、３は
溝を示し、第２図はバレルの横断面図でＡは溝の
長さ、Ｂはバレルの内径、Ｃは溝間隔、Ｄは溝
幅、Ｅは溝深さを指す。第３図は押出機のスクリ
ユー部分の縦断面図を示し、４はスクリユーを示
す。 The first is a perspective view showing a cross section of the center of the feed zone portion of the barrel used when carrying out the present invention, in which 1 is the barrel, 2 is the hopper, and 3 is the groove. In the cross-sectional view, A indicates the length of the groove, B indicates the inner diameter of the barrel, C indicates the groove interval, D indicates the groove width, and E indicates the groove depth. FIG. 3 shows a longitudinal sectional view of the screw portion of the extruder, and 4 indicates the screw.
溝間隔が50mmを超える様になると気泡を細かく
する効果は殆んど認められず、溝間隔は小さい程
効果が大きいが、餘りに溝間隔が小さいと山の部
分が変形し易くなり自ずと限度がある。故に溝間
隔は５mm以上であることが望ましい。溝幅は30mm
を超えると効果が認められなくなり、3.0mm未満
では起核剤や樹脂ペレツトが詰まり易くなるので
不適当である。溝の最大深さも5.0mmを超えると
押出変動を起こし易く、0.5mm未満では気泡を細
かくする効果が認められない。 If the groove spacing exceeds 50 mm, the effect of making the bubbles finer will hardly be recognized, and the smaller the groove spacing, the greater the effect, but if the groove spacing is small, the ridges will easily deform, which will naturally reach its limit. There is. Therefore, it is desirable that the groove spacing is 5 mm or more. Groove width is 30mm
If it exceeds 3.0 mm, no effect will be recognized, and if it is less than 3.0 mm, the nucleating agent and resin pellets tend to clog, which is inappropriate. If the maximum depth of the groove exceeds 5.0 mm, extrusion fluctuations tend to occur, and if it is less than 0.5 mm, the effect of making the bubbles finer is not observed.
通常の発泡押出では圧縮比が2.2〜3.5程度のも
のを用いるが、その様な圧縮比の押出機を用いた
場合には逆に気泡の粗いシートしか得られない。
それに対して圧縮比が2.0以下のスクリユーを具
えた押出機を用いることによつてシートの発泡状
態は極めて良質のものとなるのである。 Normal foam extrusion uses a compression ratio of about 2.2 to 3.5, but if an extruder with such a compression ratio is used, only a sheet with coarse cells can be obtained.
On the other hand, by using an extruder equipped with a screw having a compression ratio of 2.0 or less, the foamed state of the sheet becomes extremely high quality.
本発明でスチレン系樹脂としてはポリスチリ
ン、ポリスチレン共重合物、ポリスチレン変成物
などのスチレン系樹脂の１種または２種以上をブ
レンドしたものが用いられる。 In the present invention, the styrene resin used is one or a blend of two or more of styrene resins such as polystyrene, polystyrene copolymers, and modified polystyrenes.
膨張剤としては低級脂肪族炭化水素またはその
ハロゲン化物、例えばプロパン、ブタン、ペンタ
ン、ヘキサン、ヘプタン、フレオンなどが使用さ
れ、起核剤としては通常使用されている酸性物質
および炭酸ガス発生物質が使用される。 Lower aliphatic hydrocarbons or their halides, such as propane, butane, pentane, hexane, heptane, freon, etc., are used as swelling agents, and commonly used acidic substances and carbon dioxide gas generating substances are used as nucleating agents. be done.
そして膨張剤のスチレン系樹脂に対する混合率
はブタン換算で3.0〜5.0重量％が要求される。5.0
％を超えるシートの表面が荒れ、3.0％未満では
発泡倍率が上がらず、何れにしても本発明の目的
とする気泡が細かくて発泡倍率の高い良質なシー
トを得ることは出来ないのである。 The mixing ratio of the swelling agent to the styrene resin is required to be 3.0 to 5.0% by weight in terms of butane. 5.0
If it exceeds 3.0%, the surface of the sheet becomes rough, and if it is less than 3.0%, the foaming ratio does not increase, and in any case, it is impossible to obtain a high-quality sheet with fine bubbles and a high foaming ratio, which is the object of the present invention.
次に実施例及び比較例を挙げて更に説明する。 Next, further explanation will be given with reference to Examples and Comparative Examples.
比較例 １
ポリスチレン樹脂；商品名、ダイヤレツクス
HH−102（三菱モンサント化成株式会社製）70
重量部（以下、総べて重量部を指す）、商品名、
デンカスチロールHRM−２（電気化学工業株式
会社製）30部に対し、膨張剤としてブタン4.0％
とクエン酸0.1％とを混合含浸させたペレツトと
重曹0.1％とを混合し、従来の通常の発泡用押出
機（30mmφ）で発泡押出を行なつた。スクリユー
の圧縮比は2.8である。押出量５Kg／HRの時、シ
ートの光透過率は28％、発泡倍率８倍であつた。Comparative example 1 Polystyrene resin; trade name, Dialex
HH-102 (manufactured by Mitsubishi Monsanto Chemical Co., Ltd.) 70
Parts by weight (hereinafter all refer to parts by weight), product name,
30 parts of Denka Styrol HRM-2 (manufactured by Denki Kagaku Kogyo Co., Ltd.) and 4.0% butane as an expanding agent.
The pellets mixed and impregnated with 0.1% citric acid and 0.1% baking soda were mixed, and foaming extrusion was performed using a conventional foaming extruder (30 mmφ). The compression ratio of the screw is 2.8. When the extrusion rate was 5 kg/HR, the light transmittance of the sheet was 28% and the expansion ratio was 8 times.
実施例 １
比較例１と同一配合で、フイードゾーンに（バ
レル溝の長さ）／（バレルの直径）〔以下Ｌ／Ｄ
と表示する〕で3.0の先端に向うに従つて浅くな
る溝の溝幅10mm、最大溝深さ1.5mmの溝を６本備
えたバレルがあり、圧縮比1.2のスクリユーが挿
入されている30mmφ押出機で発泡押出を行なつ
た。Example 1 With the same formulation as Comparative Example 1, (length of barrel groove)/(diameter of barrel) [hereinafter L/D] was added to the feed zone.
] 3.0 There is a barrel with 6 grooves with a groove width of 10 mm and a maximum groove depth of 1.5 mm that become shallower toward the tip, and a 30 mmφ extrusion in which a screw with a compression ratio of 1.2 is inserted. Foam extrusion was carried out using a machine.
押出機５Kg／HRの時シートの光透過率は22％
発泡倍率は12倍で良質な発泡シートであつた。 When the extruder is 5Kg/HR, the light transmittance of the sheet is 22%.
The foam sheet had a foaming ratio of 12 times and was of good quality.
比較例 ２
ポリスチレン樹脂；商品名、ダイヤレツクス
HH−102（三菱モンサント化成株式会社製）60
部、商品名、トーポレツクス550（三井東圧株式
会社製）40部に対して、膨張剤としてペンタン５
％（ブタン換算４％）とクエン酸0.1％とを混合
含浸させたペレツトと重曹0.1％、タルク0.3％と
を混合し、従来の通常の発泡用押出機（40mmφ）
で発泡押出を行なつた。スクリユーの圧縮比は
3.45である。押出量10Kg／HRの時シートの光透
過率は24％、発泡倍率10倍であつた。Comparative example 2 Polystyrene resin; trade name, Dialex
HH-102 (manufactured by Mitsubishi Monsanto Chemical Co., Ltd.) 60
5 parts, trade name, Toporex 550 (manufactured by Mitsui Toatsu Co., Ltd.) 40 parts, and 5 parts of pentane as an expanding agent.
% (4% in butane equivalent) and 0.1% citric acid mixed and impregnated with 0.1% baking soda and 0.3% talc.
Foaming extrusion was carried out. The screw compression ratio is
It is 3.45. When the extrusion rate was 10 kg/HR, the light transmittance of the sheet was 24% and the expansion ratio was 10 times.
実施例 ２
比較例１と同一配合でフイードゾーンにＬ／Ｄ
で3.0の先端に向つて浅くなる溝の溝幅10mm、最
大溝深さ2.0mmの溝を８本備えたバレルを使い、
圧縮比1.15のスクリユー（40mmφ）で発泡押出を
行なつた。押出量10Kg／HRの時、シートの光透
過率は21％、発泡倍率は13倍の良質な発泡シート
を得た。Example 2 L/D in the feed zone with the same formulation as Comparative Example 1
Using a barrel with 8 grooves with a groove width of 10 mm and a maximum groove depth of 2.0 mm, the groove becomes shallower towards the tip of the 3.0.
Foam extrusion was performed using a screw (40 mmφ) with a compression ratio of 1.15. At an extrusion rate of 10 kg/HR, a high-quality foamed sheet was obtained with a sheet light transmittance of 21% and a foaming ratio of 13 times.
第１図は本発明を実施するためのバレルのフイ
ードゾーン部分の中央を断面で示した斜視図、第
２図はバレルの横断面図、第３図は押出機スクリ
ユー部分の縦断面図を示す。
図中、１：バレル、２：ホツパー、３：溝、
４：スクリユー、Ａ：溝の長さ、Ｂ：バレル内
径、Ｃ：溝間隔、Ｄ：溝幅、Ｅ：溝深さ。
FIG. 1 is a perspective view showing a central section of a feed zone portion of a barrel for carrying out the present invention, FIG. 2 is a cross-sectional view of the barrel, and FIG. 3 is a longitudinal cross-sectional view of an extruder screw portion. In the figure, 1: barrel, 2: hopper, 3: groove,
4: Screw, A: Groove length, B: Barrel inner diameter, C: Groove spacing, D: Groove width, E: Groove depth.
Claims (1)
の１種若しくは２種以上を配合したものを発泡押
出成形するに際し、押出機のバレルのフイードゾ
ーンのみに （溝の長さ）／（バレルの直径）＝1.0〜4.0で
ある長さで押出方向に直線状に溝間隔5.0mm〜50
mm、溝幅3.0〜30mm、最大溝深さが0.5mm〜5.0mmの
先端方向に順次浅くなつた溝複数個を有するバレ
ルに対し、圧縮比を1.0〜2.0とした溝部体積のス
クリユーを備えた発泡押出機を用い、スチレン系
樹脂に対する膨張剤の混合率をブタン換算で3.0
〜5.0重量％とすることを特徴とするスチレン系
樹脂の発泡押出成形法。[Scope of Claims] 1. When performing foam extrusion molding of a mixture of one or more styrenic resins containing an expanding agent and a nucleating agent, only the feed zone of the barrel of the extruder (groove length) )/(barrel diameter) = 1.0 to 4.0, and the groove spacing is 5.0 mm to 50 in a straight line in the extrusion direction.
The barrel has multiple grooves that become shallower in the distal direction with a groove width of 3.0 to 30 mm and a maximum groove depth of 0.5 mm to 5.0 mm, and a screw with a groove volume with a compression ratio of 1.0 to 2.0. Using a foaming extruder, the mixing ratio of expanding agent to styrene resin was 3.0 in terms of butane.
A method for foam extrusion molding of styrenic resin, characterized in that the amount is 5.0% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55151389A JPS5775832A (en) | 1980-10-30 | 1980-10-30 | Extrusion foam molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55151389A JPS5775832A (en) | 1980-10-30 | 1980-10-30 | Extrusion foam molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5775832A JPS5775832A (en) | 1982-05-12 |
| JPS6230088B2 true JPS6230088B2 (en) | 1987-06-30 |
Family
ID=15517508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55151389A Granted JPS5775832A (en) | 1980-10-30 | 1980-10-30 | Extrusion foam molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5775832A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03117192U (en) * | 1990-03-15 | 1991-12-04 | ||
| JP6120393B1 (en) * | 2016-07-14 | 2017-04-26 | 日本シーム株式会社 | Granulator |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4832889A (en) * | 1988-01-04 | 1989-05-23 | Mobil Oil Corporation | Vaulted screw/grooved barrel extrusion machine, method and system |
| US4842788A (en) * | 1988-01-04 | 1989-06-27 | Mobil Oil Corporation | Process of an apparatus for extruding a meltable composition |
| CN102785345A (en) * | 2012-08-22 | 2012-11-21 | 张家港市穗通机械有限公司 | Barrel |
| JP2021094835A (en) * | 2019-12-19 | 2021-06-24 | 東レ株式会社 | Single-shaft screw type extruder |
| CN119217778A (en) * | 2023-06-30 | 2024-12-31 | 宁德时代新能源科技股份有限公司 | Extrusion device |
-
1980
- 1980-10-30 JP JP55151389A patent/JPS5775832A/en active Granted
Non-Patent Citations (2)
| Title |
|---|
| PLASTIC ENGINEERING=1978 * |
| RIGID PLASTICS FORAMS=1963 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03117192U (en) * | 1990-03-15 | 1991-12-04 | ||
| JP6120393B1 (en) * | 2016-07-14 | 2017-04-26 | 日本シーム株式会社 | Granulator |
| JP2018008438A (en) * | 2016-07-14 | 2018-01-18 | 日本シーム株式会社 | Granulator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5775832A (en) | 1982-05-12 |
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