JPH0966552A - Production of polystyrenic resin sheet excellent in bending cutting properties - Google Patents
Production of polystyrenic resin sheet excellent in bending cutting propertiesInfo
- Publication number
- JPH0966552A JPH0966552A JP7223981A JP22398195A JPH0966552A JP H0966552 A JPH0966552 A JP H0966552A JP 7223981 A JP7223981 A JP 7223981A JP 22398195 A JP22398195 A JP 22398195A JP H0966552 A JPH0966552 A JP H0966552A
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- die
- bending
- extruded
- extrusion
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 238000005452 bending Methods 0.000 title abstract description 21
- 229920005989 resin Polymers 0.000 title abstract description 4
- 239000011347 resin Substances 0.000 title abstract description 4
- 238000005520 cutting process Methods 0.000 title description 8
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000001125 extrusion Methods 0.000 claims abstract description 14
- 229920005990 polystyrene resin Polymers 0.000 claims abstract description 7
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000004512 die casting Methods 0.000 claims abstract description 4
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 10
- 239000011342 resin composition Substances 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 4
- 239000002952 polymeric resin Substances 0.000 claims description 3
- 229920003002 synthetic resin Polymers 0.000 claims description 3
- 239000004793 Polystyrene Substances 0.000 description 8
- 229920002223 polystyrene Polymers 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 150000001491 aromatic compounds Chemical class 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- NVZWEEGUWXZOKI-UHFFFAOYSA-N 1-ethenyl-2-methylbenzene Chemical class CC1=CC=CC=C1C=C NVZWEEGUWXZOKI-UHFFFAOYSA-N 0.000 description 2
- JLBJTVDPSNHSKJ-UHFFFAOYSA-N 4-Methylstyrene Chemical class CC1=CC=C(C=C)C=C1 JLBJTVDPSNHSKJ-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical class CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 235000020152 coffee milk drink Nutrition 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000178 monomer Chemical class 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000006188 syrup Substances 0.000 description 2
- 235000020357 syrup Nutrition 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 125000005396 acrylic acid ester group Chemical group 0.000 description 1
- 229920001893 acrylonitrile styrene Polymers 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 230000002902 bimodal effect Effects 0.000 description 1
- 239000011258 core-shell material Substances 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 238000009820 dry lamination Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- GVVPGTZRZFNKDS-JXMROGBWSA-N geranyl diphosphate Chemical compound CC(C)=CCC\C(C)=C\CO[P@](O)(=O)OP(O)(O)=O GVVPGTZRZFNKDS-JXMROGBWSA-N 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000001755 magnesium gluconate Substances 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 125000005397 methacrylic acid ester group Chemical group 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- SCUZVMOVTVSBLE-UHFFFAOYSA-N prop-2-enenitrile;styrene Chemical compound C=CC#N.C=CC1=CC=CC=C1 SCUZVMOVTVSBLE-UHFFFAOYSA-N 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 239000012748 slip agent Substances 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 238000007666 vacuum forming Methods 0.000 description 1
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
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
- B29C48/83—Heating or cooling the cylinders
- B29C48/832—Heating
-
- 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)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、切り込みを入れて
折り曲げる際に、一回の折り曲げ動作で完全に切断可能
な、食品容器などの用途に好適な折り曲げ切断性に優れ
たポリスチレン系樹脂シ−トの製造方法に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polystyrene resin sheet excellent in bending cuttability which is suitable for applications such as food containers and which can be completely cut by one bending operation when making a cut and bending. The present invention relates to a method of manufacturing a grate.
【０００２】[0002]
【従来の技術】コーヒーミルクやガムシロップ等のポー
ションパック等の容器開封に用いられる突起部に折り曲
げ切断性を付与するためには、処方中のゴム量を減少さ
せる方法、ゴム粒子径を小さくする方法及び無機添加物
の添加等の方法により、組成物自体の脆性を発現させ
て、上記特性を満たしていた。しかし、この方法を用い
ると容器の耐衝撃強度が低下するという重大な問題点が
あった。2. Description of the Related Art In order to impart bending cutability to the protrusions used for opening containers such as potion packs such as coffee milk and gum syrup, a method of reducing the amount of rubber in the prescription and reducing the diameter of rubber particles are given. By the method and the method of adding the inorganic additive, the brittleness of the composition itself was developed to satisfy the above characteristics. However, when this method is used, there is a serious problem that the impact strength of the container is lowered.
【０００３】[0003]
【発明が解決しようとする課題】従来の技術ではシート
及び容器の折り曲げ切断性を発現させようとすると、シ
ート及び容器の耐衝撃強度が低下する。本発明は耐衝撃
性を維持しつつ、折り曲げ切断性を付与するためのポリ
スチレン系樹脂シートの製造法を提供するものである。In the prior art, when the folding and cutting properties of the sheet and the container are to be developed, the impact resistance strength of the sheet and the container is lowered. The present invention provides a method for producing a polystyrene resin sheet for imparting bending and cutting properties while maintaining impact resistance.
【０００４】[0004]
【課題を解決するための手段】本発明者らは、上記課題
を解決するべく鋭意研究した結果、ゴム変性ポリスチレ
ン樹脂とスチレン系重合体樹脂をブレンドしてなる樹脂
組成物をＴダイキャスト法によりシート状に押出し成形
する際に、押出し機のバレル内温度１８０〜１９５℃で
押出し、かつ、ダイから押出し後に押出し方向に５〜２
５％一軸延伸し、かつ、ダイから押出し後、１．０秒以
内にシート平均温度を５５℃に冷却する事により、上記
課題を解決できることを見出した。Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that a resin composition obtained by blending a rubber-modified polystyrene resin and a styrene-based polymer resin by T-die casting method. When extruded into a sheet, the temperature inside the barrel of the extruder is 180 to 195 ° C., and after extruding from the die, it is 5-2 in the extruding direction.
It was found that the above problems can be solved by cooling the sheet average temperature to 55 ° C. within 1.0 seconds after 5% uniaxial stretching and extrusion from the die.
【０００５】すなわち本発明は、シートの原料となる樹
脂組成物中にブタジエン含有量５〜１０ｗｔ％のゴム変
性ポリスチレンを５０ｗｔ％以上添加することにより、
シートに耐衝撃強度を付与し、かつ該樹脂組成物をシー
ト状に押出し成形する際に、押出し機のバレル内温度１
８０℃〜１９５℃で押出し、かつ、ダイから押出し後に
押出し方向に５〜２５％一軸延伸し、かつ、ダイから押
出し後、押出し後、１．０秒以内にシート平均温度を５
５℃に冷却する事により、延伸によって生じた分子配向
を凍結し、折り曲げ時に発生するクラックの成長のしや
すさを促進することにより、シートに折り曲げ切断性を
付与するものである。That is, according to the present invention, by adding 50 wt% or more of rubber-modified polystyrene having a butadiene content of 5 to 10 wt% to a resin composition as a raw material of a sheet,
When imparting impact resistance to a sheet and extruding the resin composition into a sheet, the temperature inside the barrel of the extruder is 1
Extruded at 80 ° C. to 195 ° C., uniaxially stretched by 5 to 25% in the extrusion direction after being extruded from the die, and extruded from the die, and after extruding, the sheet average temperature was 5% within 5 seconds.
By cooling to 5 ° C., the molecular orientation generated by stretching is frozen, and the ease of growth of cracks generated during folding is promoted, so that the sheet is provided with folding cutability.
【０００６】[0006]
【発明の実施の形態】本発明で用いられるゴム変性ポリ
スチレン（ａ）としては、１個のゴム粒子に単一のポリ
スチレン相が内包された、いわゆるコアシェル状のも
の、１個のゴム粒子に複数のポリスチレン相が内包され
それぞれのポリスチレン相がゴム層で間ぎられた、いわ
ゆるサラミ状のもの、前記２種の形状を有するゴム粒子
が混在した、いわゆるバイモーダルタイプのものなどが
挙げられる。BEST MODE FOR CARRYING OUT THE INVENTION The rubber-modified polystyrene (a) used in the present invention has a so-called core-shell shape in which a single polystyrene phase is included in one rubber particle, and a plurality of rubber particles are contained in one rubber particle. The so-called salami-like one in which the polystyrene phase is included and each polystyrene phase is sandwiched by the rubber layer, and the so-called bimodal type in which the rubber particles having the above-mentioned two types of shapes are mixed.
【０００７】また、本発明で用いられるスチレン系重合
体樹脂（ｂ）とは、ビニル置換芳香族化合物、若しくは
これと共重合可能なモノマーを重合することにより得ら
れるものである。ビニル置換芳香族化合物としては、ス
チレン、α−メチルスチレン、ｏ−メチルスチレン、ｐ
−メチルスチレン等が挙げられ、ビニル置換芳香族化合
物と共重合可能なモノマーとしては、α−メチルスチレ
ン、ｏ−メチルスチレン、ｐ−メチルスチレン、アクリ
ルニトリル、アクリル酸エステル、メタクリル酸エステ
ル、無水マレイン酸等が挙げられる。特に好ましいスチ
レン系重合体としては、ポリスチレン、アクリルニトリ
ル−スチレン共重合体、アクリル酸エステル−スチレン
共重合体、メタクリル酸エステル−スチレン共重合体、
無水マレイン酸−スチレン共重合体等が挙げられ、これ
らは目的に応じて単独又は二種以上の混合物として用い
ることができる。The styrene polymer resin (b) used in the present invention is obtained by polymerizing a vinyl-substituted aromatic compound or a monomer copolymerizable therewith. As the vinyl-substituted aromatic compound, styrene, α-methylstyrene, o-methylstyrene, p
-Methyl styrene and the like, and the monomer copolymerizable with the vinyl-substituted aromatic compound includes α-methyl styrene, o-methyl styrene, p-methyl styrene, acrylonitrile, acrylic acid ester, methacrylic acid ester, maleic anhydride. Acid etc. are mentioned. Particularly preferred styrene-based polymer, polystyrene, acrylonitrile-styrene copolymer, acrylic acid ester-styrene copolymer, methacrylic acid ester-styrene copolymer,
Examples thereof include maleic anhydride-styrene copolymer, and these may be used alone or as a mixture of two or more types depending on the purpose.
【０００８】本発明のシート及び容器は、前記した通り
各２成分を特定量使用してなる樹脂組成物を原料として
用いることにより、耐衝撃性を発現させ、またシートを
押出し成形する際に、押出し機のバレル内温度１８０〜
１９５℃で押出し、押出し後、押出し方向に５〜２５％
一軸延伸し、押出し後１．０秒以内にシート平均温度を
５５℃に冷却する事により折り曲げ切断性を発現させる
ことができる。The sheet and container of the present invention exhibit impact resistance by using as a raw material a resin composition obtained by using a specific amount of each of the two components as described above, and when the sheet is extruded, Extruder barrel temperature 180 ~
Extruded at 195 ° C, and after extrusion, 5-25% in the extrusion direction
Bending cutability can be exhibited by uniaxially stretching and cooling the sheet average temperature to 55 ° C. within 1.0 second after extrusion.
【０００９】樹脂組成物中の上記２成分のブレンド比を
以下に示す。 成分（ａ）；５０〜１００ｗｔ％、好ましくは、５０〜
１００ｗｔ％ 成分（ｂ）； ０〜 ５０ｗｔ％、好ましくは、５０〜
１００ｗｔ％ 成分（ａ）が、５０ｗｔ％より少ない場合には、十分な
耐衝撃強度を得ることができず、成形したシート及び容
器は商品価値を失ってしまう。The blending ratio of the above two components in the resin composition is shown below. Component (a); 50 to 100 wt%, preferably 50 to
100 wt% component (b); 0 to 50 wt%, preferably 50 to
When the content of 100 wt% component (a) is less than 50 wt%, sufficient impact resistance cannot be obtained, and the molded sheet and container lose commercial value.
【００１０】また、該樹脂組成物をシートに押出し成形
する際の延伸比は、押出し方向に５〜２５％、好ましく
は、１０〜１５％である。The stretch ratio when the resin composition is extruded into a sheet is 5 to 25%, preferably 10 to 15% in the extrusion direction.
【００１１】延伸比が５％より少ない場合は、シート及
び容器に良好な折り曲げ切断性を付与することができな
い。また、延伸比が２５％より大きい場合は、シート及
び容器に十分な耐衝撃強度を付与することができない。
すなわち、特公平３−７３４５１号公報にみられるよう
なゴム変性ポリスチレン樹脂および、これを含む樹脂組
成物を５０％以上の延伸倍率で一軸延伸する方法とは一
線を画する。If the stretching ratio is less than 5%, good folding and cutting properties cannot be imparted to the sheet and the container. Further, if the stretching ratio is larger than 25%, sufficient impact strength cannot be imparted to the sheet and the container.
That is, it is different from the method for uniaxially stretching a rubber-modified polystyrene resin as disclosed in Japanese Patent Publication No. 3-74351 and a resin composition containing the same at a stretch ratio of 50% or more.
【００１２】また、押出し時の押出し機のバレル内温度
は１８０〜１９５℃であることが必要であり、好ましく
は、１８０〜１９０℃である。The temperature in the barrel of the extruder at the time of extrusion must be 180 to 195 ° C, preferably 180 to 190 ° C.
【００１３】１９０℃を越える場合は延伸によって十分
な分子配向が発現しない。When the temperature exceeds 190 ° C., sufficient molecular orientation is not exhibited by stretching.
【００１４】押出し後１．０秒以内にシート平均温度を
５５℃に冷却することが必須であり、好ましくは、０．
５秒以内にシート平均温度を５５℃に冷却する必要があ
る。It is indispensable to cool the sheet average temperature to 55 ° C. within 1.0 second after extrusion, and preferably, the sheet temperature is 0.5.
It is necessary to cool the sheet average temperature to 55 ° C. within 5 seconds.
【００１５】押出し後にシート平均温度が５５℃以下に
なるのに１．０秒以上有する場合は、延伸により発生し
た分子配向が緩和してしまい、良好な折り曲げ切断性が
得られない。If the average sheet temperature after extruding falls below 55 ° C. for 1.0 second or longer, the molecular orientation generated by stretching is relaxed, and good bending cutability cannot be obtained.
【００１６】本発明の樹脂組成物は、前記２成分の重合
体以外にも必要に応じて紫外線吸収剤、酸化防止剤、滑
剤、可塑剤、補強材、スリップ剤、アンチブロッキング
剤、核剤、架橋剤、帯電防止剤、防曇剤、難燃剤、顔
料、染料等の添加剤が含まれていてもよい。The resin composition of the present invention contains, in addition to the two-component polymer, an ultraviolet absorber, an antioxidant, a lubricant, a plasticizer, a reinforcing material, a slip agent, an antiblocking agent, a nucleating agent, if necessary. Additives such as a crosslinking agent, an antistatic agent, an antifogging agent, a flame retardant, a pigment and a dye may be contained.
【００１７】本発明の樹脂組成物を得る方法としては、
従来公知の任意の手段を用いることができる。例えば、
タンブラー型ブレンダー、リボンブレンダー、Ｖ型ブレ
ンダー、ヘンシェルミキサー等において原料を混合する
方法及び前記方法で混合した混合物を押出機、ニーダ
ー、バンバリーミキサー等で溶融混練する方法等が用い
られる。The method for obtaining the resin composition of the present invention includes:
Any conventionally known means can be used. For example,
A method of mixing the raw materials in a tumbler type blender, a ribbon blender, a V type blender, a Henschel mixer, or the like, and a method of melting and kneading the mixture mixed by the above method with an extruder, a kneader, a Banbury mixer, or the like are used.
【００１８】本発明のシートは、共押出法により各種材
料と積層されていても良いし、またヒートラミネーショ
ンやドライラミネーション等の手法により他のシートと
の積層体として用いても何ら問題はない。The sheet of the present invention may be laminated with various materials by a coextrusion method, or may be used as a laminate with another sheet by a method such as heat lamination or dry lamination without any problem.
【００１９】押出し成形により得られたシートを、容器
に二次加工する方法としては、従来公知の成形法であ
る、圧空成形、真空成形、熱板成形等が挙げられる。Examples of the method for secondary processing of the sheet obtained by extrusion molding into a container include conventionally known molding methods such as pressure forming, vacuum forming, hot plate forming and the like.
【００２０】以下、実施例により本発明を更に詳細に説
明するが、以下の例に限定されないことは言うまでもな
い。Hereinafter, the present invention will be described in more detail with reference to Examples, but it goes without saying that the present invention is not limited to the following examples.
【００２１】本実験で使用した樹脂を下に記した。 成分（ａ）；ゴム変性ポリスチレン 住友化学製ＨＩＰ
Ｓ Ｅ５８０ 成分（ｂ）；一般用ポリスチレン 住友化学製ＧＰＰ
Ｓ Ｅ１８３ 本実験における評価方法及び評価基準を以下に記した。 落錘衝撃試験…ＡＳＴＭ Ｄ１７０９に準拠。撃芯先端
Ｒ１／２インチ。値が大きいほど耐衝撃強度が高い。 折り曲げ切断性…シートの残存肉厚が０．１５ｍｍにな
るように、１２０℃の刃でシートに切り込みを入れ、指
で切り込みの反対方向に１８０°折り曲げて、切断でき
るかを評価した。一回の折り曲げ動作で切断できれば
○、できなければ×とした。The resins used in this experiment are listed below. Component (a): Rubber-modified polystyrene HIP manufactured by Sumitomo Chemical
S E580 Component (b); polystyrene for general use GPP manufactured by Sumitomo Chemical
S E183 Evaluation methods and evaluation criteria in this experiment are described below. Drop weight impact test ... Complies with ASTM D1709. Hammer tip R 1/2 inch. The larger the value, the higher the impact strength. Bending cutability: A cut was made in the sheet with a blade at 120 ° C. so that the remaining thickness of the sheet was 0.15 mm, and the sheet was bent by 180 ° in the direction opposite to the cut, and it was evaluated whether or not cutting was possible. If it could be cut in one bending operation, it was evaluated as ○, and if not, it was evaluated as ×.
【００２２】[0022]
（実施例１、２）表１に示した配合割合に従い各成分を
タンブラー型ブレンダーにて混合し、１１５ｍｍΦスク
リュー、Ｌ／Ｄ３０の２軸押出機でＴダイキャスト法に
より厚さ０．６５ｍｍのシートを成形した。シート化時
のダイリップとロール間の距離、いわゆるエアギャップ
は１５０ｍｍで、シートの引取り速度を４．５〜１０ｍ
／ｍｉｎ．に変化させることにより、押し出し後シート
平均温度が５５℃になるまでの時間を変化させた。得ら
れたシートの評価結果を表１に示した。落錘衝撃強度が
２３℃で７ｋｇｆｃｍ以上で良好な折り曲げ切断性が得
られており、本発明のシートが良好な耐衝撃強度と折り
曲げ切断性を兼備していることが明らかである。 （比較例１）成分（ｂ）の配合量が５０ｗｔ％よりも多
い場合は、折り曲げ切断性は良好なものの、落錘衝撃強
度が５ｋｇｆｃｍ以下と耐衝撃性に劣ることが分かる。 （比較例２）延伸比が５％より小さい場合は、落錘衝撃
強度は十分なものの、一回の折り曲げ動作で切断するこ
とができず、折り曲げ切断性に劣ることが分かる。 （比較例３）延伸比が２５％より大きい場合は、落錘衝
撃強度が５ｋｇｆｃｍ以下と耐衝撃性に劣ることが分か
る。 （比較例４）押し出し後、シートを５５℃以下に冷却す
るのに１．０秒以上要した場合、一回の折り曲げ動作で
切断することができず、折り曲げ切断性に劣ることが分
かる。（比較例５）押し出し時の押し出し機バレル内温
度が１９０℃を越える場合、一回の折り曲げ動作で切断
することができず、折り曲げ切断性に劣ることが分か
る。(Examples 1 and 2) Each component was mixed in a tumbler type blender according to the blending ratio shown in Table 1, and a sheet having a thickness of 0.65 mm was formed by a T-die casting method using a twin screw extruder of 115 mmΦ screw and L / D30. Was molded. The distance between the die lip and the roll when forming the sheet, the so-called air gap, is 150 mm, and the sheet take-up speed is 4.5 to 10 m.
/ Min. The time until the sheet average temperature after extrusion was 55 ° C. was changed by changing Table 1 shows the evaluation results of the obtained sheets. When the falling weight impact strength was 7 kgfcm or more at 23 ° C., good bending and cutting properties were obtained, and it is clear that the sheet of the present invention has both good impact resistance and bending and cutting properties. (Comparative Example 1) When the content of the component (b) is more than 50 wt%, the bending cutability is good, but the falling weight impact strength is 5 kgfcm or less, which is inferior in the impact resistance. (Comparative Example 2) When the stretching ratio is less than 5%, the falling weight impact strength is sufficient, but it cannot be cut by one bending operation, and the bending cuttability is poor. (Comparative Example 3) When the stretch ratio is larger than 25%, it can be seen that the falling weight impact strength is 5 kgfcm or less and the impact resistance is poor. (Comparative Example 4) After extruding, when it takes 1.0 seconds or more to cool the sheet to 55 ° C. or less, it cannot be cut by one bending operation, and it is understood that the bending cutability is poor. (Comparative Example 5) When the temperature in the barrel of the extruder at the time of extrusion exceeds 190 ° C, it cannot be cut by one bending operation, and it is understood that the bending cutability is poor.
【表１】 [Table 1]
【００２３】[0023]
【発明の効果】以上の方法で得られた本発明のシート
は、高度な耐衝撃強度を備え且つ、折り曲げ切断性に優
れており、コーヒーミルクやガムシロップ等のポーショ
ンパック等の突起部のハーフカット性を要求される分野
に使用できる。EFFECT OF THE INVENTION The sheet of the present invention obtained by the above method has a high impact resistance and is excellent in bending and cutting properties, and is half of the protruding portion of potion packs such as coffee milk and gum syrup. It can be used in the fields where cutability is required.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 // Ｃ０８Ｊ 5/18 ＣＥＴ Ｃ０８Ｊ 5/18 ＣＥＴ Ｂ２９Ｋ 25:00 Ｂ２９Ｌ 7:00 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification number Office reference number FI technical display location // C08J 5/18 CET C08J 5/18 CET B29K 25:00 B29L 7:00
Claims (1)
性ポリスチレン樹脂（ａ）５０〜１００ｗｔ％と、スチ
レン系重合体樹脂（ｂ）０〜５０ｗｔ％をブレンドして
なる樹脂組成物をＴダイキャスト法によりシート状に押
出し成形する際に、（１）押出し機のバレル内温度１８
０〜１９５℃で押出しかつ、（２）ダイから押出した
後、押出し方向に５〜２５％一軸延伸し、かつ、（３）
ダイから押出し後、１．０秒以内にシート平均温度を５
５℃に冷却するポリスチレン系樹脂シートの製造方法。1. A resin composition obtained by blending 50 to 100 wt% of a rubber-modified polystyrene resin (a) having a butadiene content of 5 to 10 wt% and 0 to 50 wt% of a styrene polymer resin (b) by T die casting. (1) The temperature in the barrel of the extruder is 18 when extruded into a sheet by the method
Extruded at 0 to 195 ° C. and (2) extruded from a die, then uniaxially stretched by 5 to 25% in the extrusion direction, and (3)
After extruding from the die, the average sheet temperature should be 5 within 1.0 seconds.
A method for producing a polystyrene resin sheet, which comprises cooling to 5 ° C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7223981A JPH0966552A (en) | 1995-08-31 | 1995-08-31 | Production of polystyrenic resin sheet excellent in bending cutting properties |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7223981A JPH0966552A (en) | 1995-08-31 | 1995-08-31 | Production of polystyrenic resin sheet excellent in bending cutting properties |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0966552A true JPH0966552A (en) | 1997-03-11 |
Family
ID=16806713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7223981A Pending JPH0966552A (en) | 1995-08-31 | 1995-08-31 | Production of polystyrenic resin sheet excellent in bending cutting properties |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0966552A (en) |
-
1995
- 1995-08-31 JP JP7223981A patent/JPH0966552A/en active Pending
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