JPH0321645A - Foamed polystyrene sheet and production thereof - Google Patents
Foamed polystyrene sheet and production thereofInfo
- Publication number
- JPH0321645A JPH0321645A JP1155724A JP15572489A JPH0321645A JP H0321645 A JPH0321645 A JP H0321645A JP 1155724 A JP1155724 A JP 1155724A JP 15572489 A JP15572489 A JP 15572489A JP H0321645 A JPH0321645 A JP H0321645A
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- temperature
- resin
- extruder
- foamed polystyrene
- 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
- 229920006248 expandable polystyrene Polymers 0.000 title claims description 14
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000011347 resin Substances 0.000 claims abstract description 16
- 229920005989 resin Polymers 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 238000009835 boiling Methods 0.000 claims abstract description 8
- 150000002894 organic compounds Chemical class 0.000 claims abstract description 8
- 239000004793 Polystyrene Substances 0.000 claims abstract description 7
- 229920002223 polystyrene Polymers 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 4
- 238000002844 melting Methods 0.000 claims abstract description 3
- 230000008018 melting Effects 0.000 claims abstract description 3
- 238000010438 heat treatment Methods 0.000 claims description 11
- 239000006260 foam Substances 0.000 claims description 9
- 235000013305 food Nutrition 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract 1
- 239000011342 resin composition Substances 0.000 abstract 1
- 238000004904 shortening Methods 0.000 abstract 1
- 239000004794 expanded polystyrene Substances 0.000 description 10
- 238000000465 moulding Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 3
- 239000004604 Blowing Agent Substances 0.000 description 2
- 229920005669 high impact polystyrene Polymers 0.000 description 2
- 239000004797 high-impact polystyrene Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- -1 butane Chemical class 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は発泡ポリスチレンシートおよびその製造方法に
関する．
〔従来の技術〕
発泡ポリスチレンシートは弁当、トレイ等広く食品容器
に戒形され、使用されている．しかしながら、発泡ポリ
スチレンシートは、製造後、１０日以上経遇しないと安
定して容器を成形できないという養生の問題点を有して
いる．
また、最近、デリカ食品容器の如く少容量の容器の要望
がふえているが、従来の発泡ポリスチレンシートを使用
して成形した場合、容器の肉厚が大きく嵩高になったり
、容器の模様や角がシャープに戒形できないという課題
点を有している．〔本発明が解決しようとする問題点〕
本発明の目的は、製造後から戒形可能になるまでの期間
（養生）を短縮し、また戒形時シートの二次厚みを即制
してシャープな成形品が得られる発泡ポリスチレンシー
トを提供することにある。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a foamed polystyrene sheet and a method for producing the same. [Prior Art] Expanded polystyrene sheets are widely used in food containers such as lunch boxes and trays. However, expanded polystyrene sheets have a curing problem in that they cannot be stably molded into containers until they have been used for at least 10 days after production. In addition, recently there has been an increase in demand for small-capacity containers such as delicatessen food containers, but when molded using conventional expanded polystyrene sheets, the walls of the containers become large and bulky, and the patterns and corners of the containers The problem is that it cannot be pronounced sharply. [Problems to be solved by the present invention] The purpose of the present invention is to shorten the period (curing) from manufacturing to when the sheet can be shaped, and also to immediately control the secondary thickness of the sheet at the time of shaping to make it sharp. An object of the present invention is to provide a foamed polystyrene sheet from which a molded article can be obtained.
本発明者らは前記問題を解決する為に鋭意研究した結果
、本発明を完成した．
即ち、本発明は発泡ポリスチレンシートにおいて、厚み
が０．５〜２．０ｍｍ、見掛け密度が０．１０ 〜０．
３５ｇ／ｃｃで、単位体積当たりの連続気泡比率が５〜
９０％であることを特徴とする発泡ポリスチレンシート
である．
さらにはポリスチレンを押出機にて加熱溶融せしめ、押
出機先端に取り付けた環状スリット状金型より大気中に
放出して、発泡シートを得る方法において、樹脂１００
ｇに対して低沸点有機化合物を０．０１〜０．０７モル
混合して、加熱変形温度（ＪＩＳ Ｋ−６８７１に準
じる）より５０〜１００℃高い温度で大気中に放出した
後、冷却ドラム上で発泡シートの表面温度が加熱変形温
度より０〜５０℃高い状態で引き取る上記発泡ポリスチ
レンシートの製造方法でもある．
本発明でいう発泡ポリスチレンシートは、厚み０．５〜
２．０＋ｗｍ、好ましくは０．７〜１．５ｍ−であり、
見掛け密度０．１０〜０．３５ ｇ ／ｃｃ，好ましく
は０．１５〜０．２５ｇ／ｃｃであり、さらにベッグマ
ン式比重計で測定した単位体積当たりの連続気泡率が５
〜９０％好ましくは、１０〜５０％のものである．以上
の条件を満足する発泡ポリスチレンシートにより、製造
後から戒形可能になるまでの期間（養生）を短縮し、ま
た成形時シートの二次厚みを抑制してシャープな成形品
が得られるものである．上記範囲以外のもの、厚みが０
．５ｌ１＋未満では戒形品の強度が不足し、２．０問を
越えると戒形品が嵩高になり実用に適さない．見掛け密
度は０．１０未満では、発泡シートから得られる戒形品
の強度が不足し、０．３５ｇ／ｃｃを越えるとシートの
流れ方向に割れ易くなり実用に適さない．また連続気泡
率が５％未満のものは養生が従来と大差なく、また、或
形する際加熱により表面の気泡が膨張し、戒形品の肉厚
が大きくなり、美観を損ない、さらに品質を低下させる
．逆に９０％を越えるものでは発泡ポリスチレンシート
を製造する際、切断し易くなる．次に本発明の発泡ポリ
スチレンシートは、汎用ポリスチレン（ｃｐｐｓ）、耐
衝撃性ポリスチレン（ＨＩＰＳ）等の樹脂に、発泡剤と
して低沸点有機化合物、例えば、ブタン、ベンタン、ブ
ロバン等の炭化水素化合物、フロン−１２３、−１３４
、一２２、−１１、−１２等の低沸点ハロゲン化合物等
を使用し、さらに気泡の大きさを調整するタルク、シリ
カゲル等の無機物や帯電防止剤、着色剤等を添加して製
造されるものである．
発泡剤として使用する低沸点有機化合物は、樹脂１００
ｇに対して０．０１〜０．０７モルである， ｏ．ｏｉ
モル未満では所定の連続気泡比率を有する発泡シートが
安定して得られない．また、０．０７モルを越えると押
出機先端に取付けた環状スリット状金型より樹脂を放出
した際、花弁状のコルゲーションが多発しシート巾方向
で均一な品質のシートが得られない．
ポリスチレンと低沸点有機化合物を加熱混合した後、押
出機先端に取り付けた金型から大気中に放出される混合
樹脂の温度は、樹脂の加熱変形温度’（ＪＩＳ Ｋ−
６８７１）より５０〜１００℃高く、冷却ドラム上で発
泡シートの表面温度を冷却エアーとドラム温度で制御し
、加熱変形温度より０〜５０℃高い状態で引き取る．
放出された樹脂の温度が、加熱変形温度より５０゜Ｃ未
満では冷却ドラムに接触した際、樹脂が伸びきれず裂け
易くなり、加熱変形温度よりＩ００゜Ｃを越えると花弁
状のコルゲーシジンが多発しシート中方向で均一な品質
のシートが得られない．一方、冷却ドラム上で発泡シー
トの表面温度が加熱変形温度より低いと連続気泡を全気
泡の５％以上にすることが困難になる．逆に加熱変形温
度より５０゜Ｃを越えると冷却ドラムから引取機までの
間で発泡シートが引き伸ばされてシート巾が不足する．
〔実施例〕
次に本発明を代表的な実施例により説明する．実施例１
〜４
加熱変形温度（Ｊ Ｉ Ｓ Ｋ−６８７１）が８７゜
Ｃのポリスチレン（トーポレックス５５５；三井東圧化
学株製）１００重量部に気泡調節剤としてタルク０．５
重量部添加し、内径５０ − ６５ｍｍφのタンデム型
押出設備で溶融混練した後、表−１に示す条件で発泡シ
ートを得た．また、得られた発泡シートの物性を表−１
に記載した．
表−１における連続気泡比率は、ベックマン比重計を使
用して算出した値である．
得られた発泡ポリスチレンシート３００ｍｔＩきのロー
ルにしておき、製造５日後、１０日後、１５日後にロー
ルの外、中間、内側から３００Ｘ ３００ｍ−の大きさ
でサンプリングして、１４０℃の乾燥機中１分間放置し
、厚みを測定した．加熱後の厚み／元厚の比率で表わす
二次発泡倍率を表−１に併記した．実施例に示した発泡
シートはシート製造後５日後でもロールの外、中間側で
大差なかった．更に、この発泡ポリスチレンシートを使
用して、１００Ｘ １５０ｓ＋ｍ深さ３５ｍｍの弁当容
器を真空戒形機にて威形したところ成形品の表面は、発
泡ポリスチレンシートと同様で二次加熱による荒れはほ
とんど見られず美麗であった．
比較例ｌ、２
実施例＝１で押出機先端に取付けた金型から大気中に放
出される混合樹脂の温度が１３５℃、１９０゜Ｃとなる
様に調節した以外は同様にして発泡ポリスチレンシート
を得た．
混合樹脂の温度が１３５゜Ｃで得られた発泡ポリスチレ
ンシートの連泡気泡率は、２％でありこのシートの二次
発泡倍率を表−１に示す．製造後１０日でもロールの外
側と中間側で二次発泡倍率の差が大きく、この発泡ポリ
スチレンシートを使用して１００ Ｘ １５０＋ｉｍ深
さ３５ｍｍの弁当容器を真空戒形機にて成形したところ
成形条件の調整が困難であった．また、得られた戒形品
の表面の気泡が膨張し、戒形前の発泡ポリスチレンシー
トとは外観が大きく異なった．
混合樹脂の温度が１９０゜Ｃでは、シートが切断し易く
安定して引取れなかった、部分的に得られた発泡シート
の連続気泡比率は９０％を越えていた．比較例３、４
実施例−１で冷却ドラム上で発泡シートの表面温度が８
５゜Ｃ、１４０℃になる様に冷却調整をした以外は同様
にして発泡シートを押出した．表面温度が８５゜Ｃの条
件ではシートが流れ方向に裂け易く、１４０℃ではシー
トの幅が所定の５％も短くなってしまった．
比較例５、６
実施例−１では低沸点有機化合物を樹脂１００ ｇに対
して０．００９、０．０７２モルにした以外は同様にし
て発泡シートを押出した． ０．００９モルではシー
トが流れ方向に裂け易く、０．０７２モルではコルゲー
シゴンが大きく発生しその為シートに縞が入ってしまっ
た．
（発明の効果）
本発明で得られる発泡ポリスチレンシートは連続気泡を
有するので養生が大巾に短縮でき、また、二次戒形する
際、加熱しても、気泡の膨張が少ない為、美観がすぐれ
ていることはもとより、威形品の肉厚も少なく、特に少
容積の戒形品においては積上げ高さも小さくでき、その
結果流通コストの大幅な削減が可能となった．The present inventors completed the present invention as a result of intensive research to solve the above problem. That is, the present invention provides a foamed polystyrene sheet having a thickness of 0.5 to 2.0 mm and an apparent density of 0.10 to 0.0 mm.
35g/cc, open cell ratio per unit volume is 5~
This is a foamed polystyrene sheet characterized by 90% polystyrene. Furthermore, in a method of obtaining a foam sheet by heating and melting polystyrene in an extruder and releasing it into the atmosphere from an annular slit mold attached to the tip of the extruder,
After mixing 0.01 to 0.07 mol of a low-boiling organic compound per g and releasing it into the atmosphere at a temperature 50 to 100 degrees Celsius higher than the heat deformation temperature (according to JIS K-6871), it is placed on a cooling drum. It is also a method for producing the above-mentioned foamed polystyrene sheet, in which the surface temperature of the foamed sheet is 0 to 50°C higher than the heat deformation temperature. The expanded polystyrene sheet referred to in the present invention has a thickness of 0.5 to
2.0+wm, preferably 0.7-1.5m-,
The apparent density is 0.10 to 0.35 g/cc, preferably 0.15 to 0.25 g/cc, and the open cell rate per unit volume measured with a Beggman hydrometer is 5.
-90% preferably 10-50%. Expanded polystyrene sheets that meet the above conditions shorten the period (curing) from when they are manufactured until they can be shaped, and also suppress the secondary thickness of the sheet during molding, resulting in sharp molded products. be. Items outside the above range, thickness 0
．． If it is less than 5l1+, the strength of the precept form is insufficient, and if it exceeds 2.0 questions, the precept form becomes too bulky and is not suitable for practical use. If the apparent density is less than 0.10, the strength of the shaped article obtained from the foamed sheet will be insufficient, and if it exceeds 0.35 g/cc, the sheet will easily break in the direction of flow, making it unsuitable for practical use. In addition, for products with an open cell ratio of less than 5%, curing is not much different from conventional products, and when they are shaped, the surface bubbles expand due to heating, increasing the wall thickness of the shaped product, impairing its aesthetic appearance, and further reducing quality. Lower it. On the other hand, if it exceeds 90%, it becomes easier to cut when manufacturing expanded polystyrene sheets. Next, the expanded polystyrene sheet of the present invention is made of a resin such as general purpose polystyrene (CPPS) or high impact polystyrene (HIPS), and a low boiling point organic compound as a blowing agent, such as a hydrocarbon compound such as butane, bentane, or blobane, or a fluorocarbon. -123, -134
, -22, -11, -12, etc., and are manufactured by adding inorganic substances such as talc and silica gel to adjust the bubble size, antistatic agents, colorants, etc. It is. The low boiling point organic compound used as a blowing agent is Resin 100.
0.01 to 0.07 mol per g, o. oi
If the amount is less than mol, a foamed sheet with a predetermined open cell ratio cannot be stably obtained. Furthermore, if the amount exceeds 0.07 mol, petal-like corrugations occur frequently when the resin is discharged from the annular slit mold attached to the tip of the extruder, making it impossible to obtain a sheet with uniform quality in the sheet width direction. After heating and mixing polystyrene and a low-boiling organic compound, the temperature of the mixed resin released into the atmosphere from a mold attached to the tip of the extruder is determined by the heat distortion temperature of the resin (JIS K-
6871), and the surface temperature of the foamed sheet is controlled on the cooling drum using cooling air and drum temperature, and the sheet is taken at a temperature of 0 to 50°C higher than the heat deformation temperature. If the temperature of the released resin is less than 50°C below the heating deformation temperature, the resin will not be able to fully stretch and tear easily when it comes into contact with the cooling drum, and if it exceeds 100°C above the heating deformation temperature, petal-shaped corrugations will occur frequently. It is not possible to obtain a sheet with uniform quality in the direction of the sheet. On the other hand, if the surface temperature of the foam sheet on the cooling drum is lower than the heating deformation temperature, it will be difficult to make open cells account for 5% or more of the total cells. Conversely, if the temperature exceeds the heating deformation temperature by 50°C, the foam sheet will be stretched between the cooling drum and the take-up machine, resulting in insufficient sheet width. [Examples] Next, the present invention will be explained using representative examples. Example 1
~4 100 parts by weight of polystyrene (Toporex 555; manufactured by Mitsui Toatsu Chemical Co., Ltd.) with a heating deformation temperature (JIS K-6871) of 87°C and 0.5 parts of talc as a bubble regulator.
After adding parts by weight and melt-kneading using tandem extrusion equipment with an inner diameter of 50 to 65 mm, a foamed sheet was obtained under the conditions shown in Table 1. In addition, Table 1 shows the physical properties of the obtained foam sheet.
Described in. The open cell ratio in Table 1 is a value calculated using a Beckman hydrometer. The obtained foamed polystyrene sheet was rolled into a 300mtI roll, and 5, 10, and 15 days after production, samples were taken from the outside, middle, and inside of the roll at a size of 300 x 300 m, and placed in a dryer at 140°C. It was left for a minute and the thickness was measured. The secondary expansion ratio expressed as the ratio of thickness after heating/original thickness is also listed in Table 1. In the foamed sheet shown in the example, there was no significant difference between the outside of the roll and the middle side even 5 days after the sheet was manufactured. Furthermore, when this foamed polystyrene sheet was used to shape a lunch container of 100 x 150s + m depth 35mm using a vacuum molding machine, the surface of the molded product was similar to that of the foamed polystyrene sheet, with almost no roughness due to secondary heating. It was beautiful and beautiful. Comparative Examples 1 and 2 Expanded polystyrene sheets were produced in the same manner as in Example 1, except that the temperature of the mixed resin released into the atmosphere from the mold attached to the tip of the extruder was adjusted to 135°C and 190°C. I got it. The open cell ratio of the expanded polystyrene sheet obtained when the temperature of the mixed resin was 135°C was 2%, and the secondary expansion ratio of this sheet is shown in Table 1. Even 10 days after production, there was a large difference in the secondary expansion ratio between the outside and middle sides of the roll, and when this foamed polystyrene sheet was used to mold a lunch box of 100 x 150+im and depth 35mm using a vacuum molding machine, the molding conditions were It was difficult to adjust. In addition, the air bubbles on the surface of the obtained molded product expanded, and its appearance was significantly different from that of the expanded polystyrene sheet before molding. When the temperature of the mixed resin was 190°C, the sheet was easily cut and could not be pulled off stably, and the open cell ratio of the partially obtained foam sheet exceeded 90%. Comparative Examples 3 and 4 In Example-1, the surface temperature of the foam sheet on the cooling drum was 8
Foam sheets were extruded in the same manner except that the cooling was adjusted to 5°C and 140°C. When the surface temperature was 85°C, the sheet tended to tear in the machine direction, and at 140°C, the sheet width was shortened by 5%. Comparative Examples 5 and 6 In Example 1, foamed sheets were extruded in the same manner as in Example 1, except that the low-boiling point organic compound was changed to 0.009 and 0.072 moles per 100 g of resin. At 0.009 mol, the sheet was easily torn in the flow direction, and at 0.072 mol, large amounts of corrugations were generated, resulting in stripes on the sheet. (Effects of the invention) Since the foamed polystyrene sheet obtained by the present invention has open cells, the curing time can be greatly shortened.Also, even when heated during secondary formation, the expansion of the cells is small, so the appearance is improved. Not only is it superior, but the wall thickness of large-sized products is also small, and the stacking height can be reduced, especially for small-volume military-shaped products.As a result, distribution costs can be significantly reduced.
Claims (2)
〜２．０ｍｍ、見掛け密度が０．１０〜０．３５ｇ／ｃ
ｃで、単位体積当たりの連続気泡比率が５〜９０％であ
ることを特徴とする発泡ポリスチレンシート。(1) In a foamed polystyrene sheet, the thickness is 0.5
~2.0mm, apparent density 0.10~0.35g/c
c. A foamed polystyrene sheet characterized by having an open cell ratio per unit volume of 5 to 90%.
機先端に取り付けた環状スリット状金型より大気中に放
出して発泡シートを得る方法において、樹脂１００ｇに
低沸点有機化合物を０．０１〜０．０７モル使用し、樹
脂の加熱変形温度（ＪＩＳＫ−６８７１に準じる）より
５０〜１００℃高い温度で大気中に放出した後、冷却ド
ラム上で発泡シートの表面温度が加熱変形温度より０〜
５０℃高い状態で引き取ることを特徴とする請求項１記
載の発泡ポリスチレンシートの製造方法。(2) A method of obtaining a foam sheet by heating and melting polystyrene in an extruder and releasing it into the atmosphere from an annular slit mold attached to the tip of the extruder, in which 100 g of resin is mixed with a low boiling point organic compound of 0.01 to 100 g. After using 0.07 mol and releasing it into the atmosphere at a temperature 50 to 100°C higher than the heat deformation temperature of the resin (according to JISK-6871), the surface temperature of the foam sheet will rise to 0 to 100°C higher than the heat deformation temperature on the cooling drum.
The method for producing a foamed polystyrene sheet according to claim 1, characterized in that the sheet is taken at a temperature 50°C higher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1155724A JPH0321645A (en) | 1989-06-20 | 1989-06-20 | Foamed polystyrene sheet and production thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1155724A JPH0321645A (en) | 1989-06-20 | 1989-06-20 | Foamed polystyrene sheet and production thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0321645A true JPH0321645A (en) | 1991-01-30 |
Family
ID=15612083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1155724A Pending JPH0321645A (en) | 1989-06-20 | 1989-06-20 | Foamed polystyrene sheet and production thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0321645A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996000335A1 (en) * | 1994-06-23 | 1996-01-04 | The Dow Chemical Company | Open-cell foams in roofing systems |
| US9327418B2 (en) | 2011-09-16 | 2016-05-03 | Hitachi Chemical Company, Ltd. | Adhesive film |
-
1989
- 1989-06-20 JP JP1155724A patent/JPH0321645A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996000335A1 (en) * | 1994-06-23 | 1996-01-04 | The Dow Chemical Company | Open-cell foams in roofing systems |
| US9327418B2 (en) | 2011-09-16 | 2016-05-03 | Hitachi Chemical Company, Ltd. | Adhesive film |
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