JPS6284131A - Polystyrene foam sheet - Google Patents
Polystyrene foam sheetInfo
- Publication number
- JPS6284131A JPS6284131A JP22415485A JP22415485A JPS6284131A JP S6284131 A JPS6284131 A JP S6284131A JP 22415485 A JP22415485 A JP 22415485A JP 22415485 A JP22415485 A JP 22415485A JP S6284131 A JPS6284131 A JP S6284131A
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- foam
- filler
- foam sheet
- resin
- 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
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
Description
【発明の詳細な説明】
〔技術分野〕
、本発明は、成形性及び寸法精度にすぐれたポリスチレ
ン系発泡シートに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a polystyrene foam sheet with excellent moldability and dimensional accuracy.
従来、ポリスチレン系発泡成形品を製造するために、ポ
リスチレン系樹脂組成物に発泡剤を含浸又は練込んで押
出機から押出発泡させてシート状とし、これをそのシー
トの軟化点以上に加熱し、二次発泡させて得られた二次
発泡シートを成形型で成形し、成形品とすることは広く
行われている。Conventionally, in order to produce polystyrene foam molded products, a foaming agent is impregnated or kneaded into a polystyrene resin composition and foamed by extrusion using an extruder to form a sheet, which is then heated to a temperature above the softening point of the sheet. It is widely practiced to mold a secondary foamed sheet obtained by secondary foaming using a mold to form a molded product.
この場合、原料のポリスチレン系樹脂組成物に対し、気
泡調節剤として充填剤を0.5〜4重量重量%部加する
ことも行われている。In this case, 0.5 to 4 parts by weight of a filler is also added as a cell regulator to the raw material polystyrene resin composition.
ところで、このような従来のポリスチレン系発泡シート
においては、これを成形金型で成形した時に、得られる
発泡成形品の寸法精度が悪い上に。By the way, when such conventional polystyrene foam sheets are molded using a mold, the dimensional accuracy of the resulting foam molded product is poor.
発泡成形品を重ねた時のスタック高さが高いため。This is due to the high stack height when stacking foam molded products.
発泡成形品を包装するのに必要な包装材の使用量が多く
なるという欠点を有した。This method has the disadvantage that a large amount of packaging material is required to package the foam molded product.
本発明は、従来のポリスチレン系発泡シートに見られる
前記欠点を克服し、寸法精度にすぐれると共にスタット
高さが小さく、かつコストの安価な二次発泡成形品を得
るのに好適なポリスチレン系発泡シートを提供すること
を目的とする。The present invention overcomes the above-mentioned drawbacks found in conventional polystyrene foam sheets, and provides a polystyrene foam sheet suitable for obtaining a secondary foam molded product that has excellent dimensional accuracy, a small stud height, and is inexpensive. The purpose is to provide sheets.
本発明によれば、ポリスチレン樹脂を基材樹脂とする発
泡シートからなり、該シート中に5〜30重量部の充填
剤を含有し、シート厚み0.3〜3 、0m+n。According to the present invention, the foamed sheet is made of polystyrene resin as the base resin, contains 5 to 30 parts by weight of filler, and has a sheet thickness of 0.3 to 3 mm and 0 m+n.
密度0.07〜0.5g/cnrを有し、さらに発泡シ
ート製造後、5日〜90日目において、温度条件135
℃で30秒間オーブン中で加熱した時に、シートのMD
方法の変化率が一10〜+2%の範囲に調整されている
ことを特徴とするポリスチレン系発泡シートが提供され
る。It has a density of 0.07 to 0.5 g/cnr, and the temperature condition is 135 on the 5th to 90th day after producing the foam sheet.
The MD of the sheet when heated in an oven for 30 seconds at ℃
A polystyrene foam sheet is provided, characterized in that the rate of change in the process is adjusted to a range of 110% to +2%.
本発明の発泡シートは、ポリスチレン系樹脂を基材樹脂
とし、かつ充填剤5〜30重量%を含有する。この場合
、充填剤は、二次発泡成形品の寸法精度を高めると共に
、二次発泡成形性を向上させる効果を示す。充填剤含量
が5重量%より少ないと、二次発泡成形品の寸法精度が
悪くなり、一方。The foamed sheet of the present invention uses a polystyrene resin as a base resin and contains 5 to 30% by weight of a filler. In this case, the filler has the effect of increasing the dimensional accuracy of the secondary foam molded product and improving the secondary foam moldability. On the other hand, if the filler content is less than 5% by weight, the dimensional accuracy of the secondary foamed product will be poor.
30重量%を超えるようになると、二次発泡成形品が脆
弱になると共に、発泡シートの製造が困難になる。When it exceeds 30% by weight, the secondary foamed molded product becomes brittle and it becomes difficult to manufacture a foamed sheet.
本発明で用いる前記充填剤としては、例えば、タルク、
炭酸カルシウム、シリカ、ケイソウ上等の一般の無機物
質が用いられる他、ステアリン酸カルシウム等の金属石
けん等が用いられる。このような充填剤の粒径は、通常
、20μm以下、好ましくは2〜15μmであり、その
樹脂に対する配合割合は、樹脂と充填剤の合計量に対し
、5〜30重量%、好ましくは7〜20重量%である。The filler used in the present invention includes, for example, talc,
In addition to general inorganic substances such as calcium carbonate, silica, and diatomaceous materials, metal soaps such as calcium stearate are also used. The particle size of such a filler is usually 20 μm or less, preferably 2 to 15 μm, and its proportion to the resin is 5 to 30% by weight, preferably 7 to 30% by weight, based on the total amount of resin and filler. It is 20% by weight.
また1本発明で用いるスチレン系樹脂としては、例えば
、ポリスチレン樹脂、スチレン−アクリロニトリル共重
合体樹脂、スチレン−メチルメタアクリレート共重合体
樹脂、スチレン−アクリル酸共重合体樹脂、スチレン−
無水マレイン酸共重合体樹脂、ポリメチルスチレン樹脂
、及びそれら樹脂のブレンド物が挙げられる。Examples of the styrene resin used in the present invention include polystyrene resin, styrene-acrylonitrile copolymer resin, styrene-methyl methacrylate copolymer resin, styrene-acrylic acid copolymer resin, and styrene-acrylic acid copolymer resin.
Examples include maleic anhydride copolymer resins, polymethylstyrene resins, and blends of these resins.
本発明の発泡シートは、前記したスチレン系樹脂と充填
剤の組成物を、発泡剤の存在下、押出発泡成形機を用い
てシート状に押出発泡成形することによって製造するこ
とができる。この場合、発泡剤としては、慣用の物理発
泡剤又は化学発泡剤が用いられる。物理発泡剤としては
、例えば、プロパン、ブタン、ペンタン、ペンテン、ヘ
キサン、ヘプタン等の脂肪族炭化水素類、シクロブタン
、シクロペンタン等の脂環式炭化水素類、トリクロロフ
ルオロメタン、ジクロロジフルオロメタン、トリクロロ
トリフルオロエタン、ジクロロテトラフルオロエタン、
モノクロロジフルオロメタン、メチルクロライド、メチ
レンクロライド、エチルクロライド、エチレンクロライ
ド等のハロゲン化炭化水素類の1種、又は2種以上の混
合物が使用でき、さらに、二酸化炭素、空気、水等も使
用することができる。化学発泡剤としては1例えば、ア
ゾジカルボンアミド、ジニトロソペンタメチレンテトラ
ミン等の有機系発泡剤や重炭酸ナトリウムやこれとクエ
ン酸又はその塩との組合せ等が使用される。The foamed sheet of the present invention can be produced by extruding and foam-molding the composition of the above-described styrenic resin and filler into a sheet using an extrusion foam molding machine in the presence of a foaming agent. In this case, a conventional physical blowing agent or chemical blowing agent is used as the blowing agent. Examples of physical blowing agents include aliphatic hydrocarbons such as propane, butane, pentane, pentene, hexane, and heptane, alicyclic hydrocarbons such as cyclobutane and cyclopentane, trichlorofluoromethane, dichlorodifluoromethane, and trichlorotrifluoromethane. Fluoroethane, dichlorotetrafluoroethane,
One or a mixture of two or more halogenated hydrocarbons such as monochlorodifluoromethane, methyl chloride, methylene chloride, ethyl chloride, and ethylene chloride can be used, and carbon dioxide, air, water, etc. can also be used. can. Examples of chemical blowing agents used include organic blowing agents such as azodicarbonamide and dinitrosopentamethylenetetramine, sodium bicarbonate, and a combination thereof with citric acid or a salt thereof.
本発明においては、前記のようにして発泡シートを得る
場合、その発泡倍率を調節し、厚さ0.3−3.0mm
、密度(嵩密度)0.07〜0.5g/curを有し、
発泡シート成形後5〜30重量の任意の時間において、
温度条件135°Cで30秒間オーブン中で加熱した時
に、シートのMD力方向シートの流れ方向に対して垂直
方向)の変化率が一10〜+2%の範囲にある発泡シー
トを形成させる。In the present invention, when obtaining a foam sheet as described above, the foaming ratio is adjusted and the thickness is 0.3-3.0 mm.
, has a density (bulk density) of 0.07 to 0.5 g/cur,
At any time from 5 to 30 weight after foam sheet molding,
When heated in an oven at a temperature of 135° C. for 30 seconds, a foamed sheet is formed in which the MD force direction (direction perpendicular to the flow direction of the sheet) of the sheet ranges from 110% to +2%.
なお、本明細書でいう変化率とは1発泡シートのMD力
方向収縮又は伸長した度合を表わすもので、次の式で表
わされる。Note that the rate of change in this specification represents the degree of contraction or expansion of one foam sheet in the MD force direction, and is expressed by the following formula.
ハ
P:変化率(%)
A:加熱前の発泡シートの長さ
B:加熱後の発泡シートの長さ
本発明において、発泡シートの収縮率を一10〜+2%
、好ましくは一5〜0%の範囲に規定することは重要で
、この変化率の規定により、二次成形性の良好な発泡シ
ートとすることができる。変化率が一10%よりも小さ
くなる、即ち、収縮率が大きくなると、シートの深絞り
が困難になり、一方、2%を超えるようになる。即ち、
伸長率が大きくなると、成形品の発泡シートが重くなり
、外観不良となる。本発明において、発泡シートの変化
率は、発泡シートを製造する場合の条件1例えば、発泡
倍率及び充填剤の添加量、押出温度、押出速度、引取速
度、マンドレル径等を調節することによって調節するこ
とができる。また、本発明において1発泡シートの密度
は0.07〜0.5g/cJ、好ましくは0.1〜0.
4g/crIの範囲に規定し、発泡シートの厚みは0.
3〜3.0m111.好ましくは0.5〜2.5+om
に規定するが、発泡シートの密度及び厚みが前記範囲を
逸脱すると1品質のすぐれた二次成形品を得るのが困雅
になる。P: Rate of change (%) A: Length of the foam sheet before heating B: Length of the foam sheet after heating In the present invention, the shrinkage rate of the foam sheet is -10 to +2%.
It is important to specify the change rate preferably in the range of -5 to 0%, and by specifying this change rate, a foamed sheet with good secondary moldability can be obtained. When the rate of change becomes less than 110%, that is, when the shrinkage rate increases, deep drawing of the sheet becomes difficult, while when it exceeds 2%. That is,
When the elongation rate increases, the foamed sheet of the molded product becomes heavy, resulting in poor appearance. In the present invention, the rate of change of the foamed sheet is adjusted by adjusting the conditions 1 for manufacturing the foamed sheet, such as the expansion ratio, amount of filler added, extrusion temperature, extrusion speed, take-up speed, mandrel diameter, etc. be able to. In addition, in the present invention, the density of one foam sheet is 0.07 to 0.5 g/cJ, preferably 0.1 to 0.5 g/cJ.
4 g/crI, and the thickness of the foam sheet is 0.
3-3.0m111. Preferably 0.5-2.5+om
However, if the density and thickness of the foam sheet deviate from the above ranges, it will be difficult to obtain a secondary molded product of excellent quality.
本発明の発泡シートに対しては、必要に応じ。For the foam sheet of the present invention, as necessary.
その片面又は両面に、熱可塑性樹脂フィルムを被覆する
ことができ、この場合、熱可塑性樹脂フィルムとしては
、例えば、ポリスチレンフィルム、ポリエチレンフィル
ム、ポリスチレンとゴムの共重合体又はブレンド体のフ
ィルム、耐衝撃性ポリスチレンフィルム、ポリプロピレ
ンフィルム等が用いられ、これらの熱可塑性樹脂フィル
ムは、前記したような充填剤を含有することもできる。One or both sides thereof can be coated with a thermoplastic resin film. In this case, the thermoplastic resin film includes, for example, a polystyrene film, a polyethylene film, a film of a copolymer or blend of polystyrene and rubber, and an impact-resistant film. Polystyrene films, polypropylene films, etc. are used, and these thermoplastic resin films can also contain fillers as described above.
この熱可塑性樹脂フィルムの厚さは40〜300μm、
好ましくは60〜200μmである。The thickness of this thermoplastic resin film is 40 to 300 μm,
Preferably it is 60 to 200 μm.
本発明のポリスチレン系発泡シートは、寸法精度、二次
発泡成形性にすぐれる他、耐熱性及び経済性においても
すぐれたものであり、食品分野。The polystyrene foam sheet of the present invention has excellent dimensional accuracy and secondary foam moldability, as well as excellent heat resistance and economic efficiency, and is suitable for use in the food field.
断熱材や緩衝材分野及び包装分野における発泡成形品製
造用発泡シートとして有利に用いられる。It is advantageously used as a foam sheet for producing foam molded products in the fields of heat insulation materials, cushioning materials, and packaging.
次に、本発明を実施例によりさらに詳細に説明する。 Next, the present invention will be explained in more detail with reference to Examples.
実施例1
ポリスチレン樹脂に対し、充填剤として、を配合した樹
脂組成物を、押出発泡成形機を用い、発泡剤としてのブ
タンの存在下、シート状に発泡成形し、第1表に示す性
状の発泡シートを得た。Example 1 A resin composition containing polystyrene resin as a filler was foam-molded into a sheet shape using an extrusion foam molding machine in the presence of butane as a foaming agent, and the resin composition had the properties shown in Table 1. A foam sheet was obtained.
次に、このようにして得られた発泡シートを金型に入れ
、幅90+B+s、長さ192+nm、深さ15mm、
側壁厚さ2.8mm、底厚3.5mmのトレー状に二次
発泡成形した。この場合、二次発泡成形は、温度400
°C1時間4.7秒の条件で行った。このようにして得
られた発泡成形品の寸法精度及び柔軟性を次のようにし
て評価した。Next, the foam sheet obtained in this way was put into a mold, and the width was 90+B+s, the length was 192+nm, the depth was 15mm,
It was formed into a tray shape with a side wall thickness of 2.8 mm and a bottom thickness of 3.5 mm. In this case, the secondary foam molding is performed at a temperature of 400
The test was carried out at °C for 1 hour and 4.7 seconds. The dimensional accuracy and flexibility of the foamed molded product thus obtained were evaluated as follows.
成形品の横方向の金型に対する収縮率を測定し、その収
縮率により寸法精度を評価した。The shrinkage rate of the molded product in the lateral direction with respect to the mold was measured, and the dimensional accuracy was evaluated based on the shrinkage rate.
O・・・収縮率が5%以下
X・・・収縮率が5%より大
〔柔軟性〕
成形品の柔軟性は、成形品シート片を圧縮試験(JIS
K 6769、試験条件10mm/分)して得られる
圧縮歪により評価した。O...Shrinkage rate is 5% or less
K 6769, test condition: 10 mm/min) and evaluated by compressive strain obtained.
○・・・圧縮歪40%以上
X・・・圧縮歪が40%を超える
なお、第1表に示した発泡シートの変化率は、縦方向1
00mm、横方向100+nmの正方形の製造後30日
口の発泡シー1−サンプルを、ギヤーオーブン中で。○... Compressive strain of 40% or more
00 mm, 100+ nm transversely square 30 day old foamed sheet 1 sample in a gear oven.
135℃で30秒間熱処理した時のMD力方向シート変
化率を示すものである。It shows the sheet change rate in the MD force direction when heat treated at 135° C. for 30 seconds.
また、第1表において、実施例4、実施例5及び比較例
4の発泡シートは、その片面に耐衝撃性ポリスチレンフ
ィルムをラミネートしたものである。Further, in Table 1, the foamed sheets of Example 4, Example 5, and Comparative Example 4 were laminated with an impact-resistant polystyrene film on one side.
Claims (1)
からなり、該シート中に5〜30重量%の充填剤を含有
し、シート厚み0.3〜3.0mm、密度0.07〜0
.5g/cm^3を有し、さらに発泡シート製造後、5
日〜90日目において、温度条件135℃で、30秒間
オーブン中で加熱した時に、シートのMD方向の変化率
が−10〜+2%の範囲に調整されていることを特徴と
するポリスチレン系発泡シート。(1) Consists of a foamed sheet using polystyrene resin as the base resin, containing 5 to 30% by weight of filler, sheet thickness of 0.3 to 3.0 mm, and density of 0.07 to 0.
.. 5g/cm^3, and after producing the foam sheet, 5g/cm^3.
Polystyrene foam characterized in that the rate of change in the MD direction of the sheet is adjusted to a range of -10 to +2% when heated in an oven for 30 seconds at a temperature of 135°C on days 1 to 90. sheet.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22415485A JPS6284131A (en) | 1985-10-08 | 1985-10-08 | Polystyrene foam sheet |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22415485A JPS6284131A (en) | 1985-10-08 | 1985-10-08 | Polystyrene foam sheet |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6284131A true JPS6284131A (en) | 1987-04-17 |
Family
ID=16809378
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP22415485A Pending JPS6284131A (en) | 1985-10-08 | 1985-10-08 | Polystyrene foam sheet |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6284131A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01209120A (en) * | 1988-02-17 | 1989-08-22 | Sekisui Plastics Co Ltd | Preparation of styrenic resin foam sheet and thermoformable styrenic resin foam sheet |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58196239A (en) * | 1982-05-11 | 1983-11-15 | Sekisui Plastics Co Ltd | Polystyrene foam sheet suitable for use in fabrication |
-
1985
- 1985-10-08 JP JP22415485A patent/JPS6284131A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58196239A (en) * | 1982-05-11 | 1983-11-15 | Sekisui Plastics Co Ltd | Polystyrene foam sheet suitable for use in fabrication |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01209120A (en) * | 1988-02-17 | 1989-08-22 | Sekisui Plastics Co Ltd | Preparation of styrenic resin foam sheet and thermoformable styrenic resin foam sheet |
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