JP2007175880A - Smc sheet reduced in diffusion amount of styrene and its housing method - Google Patents

Smc sheet reduced in diffusion amount of styrene and its housing method Download PDF

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JP2007175880A
JP2007175880A JP2005373594A JP2005373594A JP2007175880A JP 2007175880 A JP2007175880 A JP 2007175880A JP 2005373594 A JP2005373594 A JP 2005373594A JP 2005373594 A JP2005373594 A JP 2005373594A JP 2007175880 A JP2007175880 A JP 2007175880A
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film
styrene gas
smc sheet
smc
styrene
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Kaoru Takahashi
薫 高橋
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Bridgestone Corp
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Bridgestone Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an SMC (Sheet Molding Compound) sheet miniaturized in the use of an expensive styrene gas impermeable film and constituted so as to apply a device to the housing method of the SMC sheet from manufacture to the state immediately before used in ageing and molding. <P>SOLUTION: When the SMC sheet, of which one side is covered with a styrene gas permeable film and the other side is covered with the styrene gas impermeable film, is housed, the SMC sheet is zigzag folded in a housing box so that the styrene gas impermeable film becomes the uppermost surface and the upper surface of the housing box is covered with the styrene gas impermeable film. The SMC sheet 1 is composed of SMC 2, a carrier film (styrene gas permeable film) 3 and a carrier film (styrene gas impermeable film) 4 and housed in the SMC sheet housing box 20 having a styrene gas impermeable film 21 formed to its inner surface. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、スチレン放散量を低減したシ−トモ−ルディングコンパウンド（以下、ＳＭＣという）シ−ト及びその収納法に関するものである。   The present invention relates to a sheet molding compound (hereinafter referred to as SMC) sheet having a reduced amount of styrene diffused and a method for storing the sheet.

ＳＭＣは、防水パン、浴槽、水槽用パネル等の繊維強化プラスチック成形品の成形材料として広く用いられているところであるが、製造直後のＳＭＣは比較的粘度が低く取扱いが難しいため、一定期間熟成され、増粘されて用いられるのが一般的である。しかるに、この熟成期間中にＳＭＣ内よりスチレンガスが放散する。かかるスチレンガスの放散は作業者に悪影響を与えるだけでなく、その後のＳＭＣの性状にも大きく影響し、例えば、ＳＭＣのポットライフが短くなったり、成形品の色が変わったり、成形性の低下等の変質がもたらされる。   SMC is widely used as a molding material for fiber reinforced plastic molded products such as waterproof pans, bathtubs, and aquarium panels. However, SMC is relatively matured for a certain period of time because it is relatively low in viscosity and difficult to handle. Generally, it is used after being thickened. However, styrene gas is released from the SMC during this aging period. Such emission of styrene gas not only adversely affects workers, but also greatly affects the properties of the subsequent SMC. For example, the pot life of the SMC is shortened, the color of the molded product is changed, and the moldability is deteriorated. Such alterations are brought about.

そして、ＳＭＣシ−トはキャリアフィルムにて両面が覆われているが、このフィルムは通常はスチレンガス透過性のフィルムが用いられており、その放散を防止することはできず、従って、スチレンガス不透過性のフィルムを両面より覆う方法も考えられている（特許文献１）。しかるに、キャリアフィルムにはいくつもの特性が要求され、特に、耐引裂強度、耐溶媒膨潤性、ＳＭＣ剥離性等が要求されるが、これらを満たすために多積層フィルムとなり、製品として高価なものとなり、実用的でない。   The SMC sheet is covered on both sides with a carrier film, but this film is usually a styrene gas permeable film and cannot prevent its diffusion. A method of covering an impermeable film from both sides is also considered (Patent Document 1). However, the carrier film is required to have a number of characteristics, particularly tear strength, solvent swell resistance, SMC peelability, and the like. Not practical.

特開昭４８−５１０６５号公報JP 48-51065 A

そして、場合によってはスチレンガス不透過性フィルムによって形成される袋内にＳＭＣシ−トをつづら折りに納められ、これを収納箱に入れられて熟成されるが、これによっても袋の封止は十分ではなく、コストアップともなる（特許文献２）。   In some cases, the SMC sheet is folded in a bag formed of a styrene gas-impermeable film and then aged in a storage box. This also provides sufficient sealing of the bag. However, this also increases costs (Patent Document 2).

特開平１１−３４２５１１号公報JP 11-342511 A

本発明は、上記のような従来の技術に鑑みてなされたものであり、ＳＭＣシ−トを得るに当たって、スチレンガスの放散が低減され、かつ収納性にも優れたＳＭＣシ−トを提供する。   The present invention has been made in view of the prior art as described above. In obtaining an SMC sheet, the present invention provides an SMC sheet in which styrene gas emission is reduced and storage is excellent. .

発明の第１の要旨は、その両面をフィルムにて覆われたＳＭＣシ−トにおいて、フィルムの一方がスチレンガス透過性フィルムであり、フィルムの他方がスチレンガス不透過性フィルムであることを特徴とするスチレン放散量を低減したＳＭＣシ−トにかかるものである。   A first aspect of the invention is characterized in that in the SMC sheet whose both surfaces are covered with a film, one of the films is a styrene gas permeable film and the other of the films is a styrene gas impermeable film. The SMC sheet having a reduced styrene emission amount is used.

発明の第２の要旨は、一方面がスチレンガス透過性フィルムであり、他方面がスチレンガス不透過性フィルムで覆われた請求項１に記載のＳＭＣシ−トを収納するに際して、ＳＭＣシ−トを収納箱内につづら折りに、かつ、最上面にスチレンガス不透過性フィルムが来るように折り込まれ、収納箱の上面を当該スチレンガス不透過性フィルムにて覆ったことを特徴とするＳＭＣシ−トの収納法にかかるものである。   According to a second aspect of the invention, when the SMC sheet according to claim 1 is housed, one side is a styrene gas permeable film and the other side is covered with a styrene gas impermeable film. The SMC sheet is characterized in that it is folded in a storage box so that the styrene gas impermeable film comes to the uppermost surface, and the upper surface of the storage box is covered with the styrene gas impermeable film. -It depends on the storage method.

発明の第３の要旨は、一方面がスチレンガス透過性フィルムであり、他方面がスチレンガス不透過性フィルムで覆われた請求項１に記載のＳＭＣシ−トを収納するに際して、ＳＭＣシ−トをロ−ル巻きに、かつ、ロ−ルの最上面にスチレンガス不透過性フィルムが来るように巻き込まれ、ロ−ルの最上面を当該スチレンガス不透過性フィルムにて覆ったことを特徴とするＳＭＣシ−トの収納法にかかるものである。   According to a third aspect of the invention, when the SMC sheet according to claim 1 is housed, one side is a styrene gas permeable film and the other side is covered with a styrene gas impermeable film. The roll was wound around a roll and the styrene gas impermeable film was placed on the uppermost surface of the roll, and the uppermost surface of the roll was covered with the styrene gas impermeable film. The present invention relates to the storage method of the characteristic SMC sheet.

本発明は以上の通りであり、高価なスチレンガス不透過性フィルムの使用を最小限としたＳＭＣシ−トであり、かつ、製造から熟成及び成形に使用される直前までの収納法に工夫を加えたものであり、スチレンガスの放散が著しく低下したものである。   The present invention is as described above, and is an SMC sheet that minimizes the use of an expensive styrene gas-impermeable film, and is devised in a storage method from manufacturing to immediately before being used for aging and molding. In addition, the emission of styrene gas was significantly reduced.

本発明は、スチレンガスの放散を防止したＳＭＣシ−ト及びこの収納法にかかり、安価な手段でスチレンガスの放散を防止し、しかも廉価な収納法を提供するものである。ＳＭＣシ−トは上下のキャリアフィルムに挟まれた状態でＳＭＣシ−トが得られるため、これらキャリアフィルムには、耐引裂強度、耐溶媒膨潤性、ＳＭＣ剥離性等が要求されると共に、価格が廉価であることが要求される。   The present invention relates to an SMC sheet that prevents the diffusion of styrene gas and this storage method, and provides an inexpensive storage method that prevents the diffusion of styrene gas by an inexpensive means. Since the SMC sheet is obtained with the SMC sheet sandwiched between upper and lower carrier films, these carrier films are required to have tear resistance, solvent swell resistance, SMC peelability, etc. Is required to be inexpensive.

スチレンガス不透過性フィルムの例としては、ポリアミド、ポリビニルアルコ−ル、ポリエチレンテレフタレ−ト、ＥＶＡ等のフィルムがあるが、各要求を充足するものとして、例えばポリエチレン／ポリエチレンテレフタレ−ト／ポリエチレンによる３層構造のフィルムが挙げられる。   Examples of styrene gas impermeable films include films of polyamide, polyvinyl alcohol, polyethylene terephthalate, EVA, etc., but satisfying each requirement, for example, polyethylene / polyethylene terephthalate / polyethylene. A film having a three-layer structure is available.

第１発明にあっては、ポリエチレンやポリプロピレン等のスチレンガス透過性フィルムとの組み合わせでＳＭＣシ−トを両面から覆ったものであり、これによってコストの低減とスチレンガスの放散を低減したもので、具体的にはスチレンガス不透過フィルム側を空気に触れる側としてつづら折りして収納するＳＭＣシ−トである。   In the first invention, the SMC sheet is covered from both sides with a combination of styrene gas permeable films such as polyethylene and polypropylene, thereby reducing cost and styrene gas emission. Specifically, it is an SMC sheet that folds and stores the styrene gas impermeable film side as the side that comes into contact with air.

そして、第２発明にあっては、収納箱内に配置されたスチレンガス不透過性フィルムとかかるＳＭＣシ−トの最上位のスチレンガス不透過フィルムとの間を接着してＳＭＣシ−ト全体を大気と遮断してしまう収納法である。スチレンガスの放散を完全に防止する袋体を得るには極めてコストが高くつくが、本発明の方法では比較的安価な収納法が提供できたものである。   In the second invention, the entire SMC sheet is bonded by bonding between the styrene gas impervious film disposed in the storage box and the uppermost styrene gas impervious film of the SMC sheet. It is a storage method that shuts off from the atmosphere. Although it is very expensive to obtain a bag that completely prevents the styrene gas from being diffused, the method of the present invention can provide a relatively inexpensive storage method.

そして、第３発明にあっては、ロ−ル巻きとしたＳＭＣシ−トの最外面をスチレンガス不透過性フィルムとしたものであり、これによってＳＭＣシ−ト全体を大気と遮断してしまう収納法である。スチレンガスの放散を完全に防止する袋体を得るには極めてコストが高くつくが、本発明の方法では比較的安価な収納法が提供できたものである。   In the third aspect of the invention, the outermost surface of the roll-wrapped SMC sheet is a styrene gas-impermeable film, thereby blocking the entire SMC sheet from the atmosphere. The storage method. Although it is very expensive to obtain a bag that completely prevents the styrene gas from being diffused, the method of the present invention can provide a relatively inexpensive storage method.

以下、図面をもって本発明を更に詳細に説明する。図１は第１発明のＳＭＣシ−トの断面図であり、１はＳＭＣシ−ト、２はＳＭＣ、３、４はキャリアフィルムであり、特に、３はポリエチレンフィルム（スチレンガス透過性フィルム）、４はポリエチエン／ポリエチレンテレフタレ−ト／ポリエチレンの３層フィルム（スチレンガス不透過性フィルム）である。かかるＳＭＣシ−トの収納時には、フィルム４側を大気側として収納することによって、スチレンガスの放散が低下することとなる。   Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a cross-sectional view of the SMC sheet of the first invention. 1 is an SMC sheet, 2 is an SMC, 3 and 4 are carrier films, and in particular, 3 is a polyethylene film (styrene gas permeable film). Reference numeral 4 denotes a polyethylene / polyethylene terephthalate / polyethylene three-layer film (styrene gas-impermeable film). When the SMC sheet is stored, the styrene gas emission is lowered by storing the film 4 side as the atmosphere side.

尚、ＳＭＣシ−トの製法について言えば、図２に示すように、下部キャリアフィルム供給装置１１から巻き出されたキャリアフィルム３上に、例えば不飽和ポリエステル樹脂に炭カルその他の副資材等を配合したＳＭＣ組成物１２ａをシ−ト状に載置し、この上にロ−ビングカッタ−１３にて短く切断したガラス繊維１４を振り撒く。一方、上部キャリアフィルム供給装置１５から巻き出されたキャリアフィルム４上に前記と同様のＳＭＣ組成物１２ｂをシ−ト状に載置し、両組成物１２ａ、１２ｂを重ねてキャリアフィルム３、４に挟み込み、これを巻き取り装置１６にて巻き取る製法が一般的である。   As for the manufacturing method of the SMC sheet, as shown in FIG. 2, on the carrier film 3 unwound from the lower carrier film supply device 11, for example, an unsaturated polyester resin with charcoal cal or other auxiliary materials, etc. The blended SMC composition 12a is placed in a sheet shape, and the glass fiber 14 cut short with a roving cutter 13 is sprinkled on the sheet. On the other hand, on the carrier film 4 unwound from the upper carrier film supply device 15, the same SMC composition 12b as described above is placed in a sheet shape, and both the compositions 12a and 12b are stacked to form the carrier films 3, 4 A manufacturing method is generally used in which the film is sandwiched between the two and wound up by the winding device 16.

図３はＳＭＣシ−トを収納する第２発明の全体図であり、２０はＳＭＣシ−トの収納箱であり、収納箱１０内にスチレンガス不透過性フィルムをもって構成した袋或いは収納箱の内面にかかるフィルム２１を積層したものである。そして、前記のＳＭＣシ−ト１をつづらおりに重ねて収納し、最上位にスチレンガス不透過性フィルム４が来るように裁断し、このフィルム４と収納箱２０内のフィルム２１を接着して両フィルム内にＳＭＣシ−ト１を内包する方法である。   FIG. 3 is an overall view of the second invention for storing the SMC sheet, and 20 is a storage box for the SMC sheet. The storage box 10 is a bag or storage box made of styrene gas-impermeable film. The film 21 is laminated on the inner surface. Then, the SMC sheet 1 is stored in a zigzag manner, cut so that the styrene gas impermeable film 4 comes to the top, and the film 4 and the film 21 in the storage box 20 are bonded. In this method, the SMC sheet 1 is included in both films.

ＳＭＣシ−トを収納する第３発明については特に図示しないが、図２における巻き取り装置１６によって巻き取られたＳＭＣシ−トは最外面がスチレンガス不透過性フィルム４にて覆われており、これによってＳＭＣシ−トを内包する方法である。   The third invention for storing the SMC sheet is not particularly shown, but the outermost surface of the SMC sheet wound by the winding device 16 in FIG. 2 is covered with the styrene gas impermeable film 4. This is a method of including the SMC sheet.

本発明は以上の通りであって、スチレンガスの放散の少ない比較的安価なＳＭＣシ−ト及びその収納法を提供できたものであり、付随効果として水蒸気の侵入もなく、その利用範囲は極めて広い。   The present invention is as described above, and can provide a relatively inexpensive SMC sheet with little diffusion of styrene gas and a method for storing the SMC sheet. wide.

図１は第１発明におけるＳＭＣシ−トの断面図である。FIG. 1 is a cross-sectional view of an SMC sheet in the first invention. 図２は第１発明のＳＭＣシ−トの製法を示す全体図である。FIG. 2 is an overall view showing a method for producing the SMC sheet of the first invention. 図３は第２発明におけるＳＭＣシ−ト収納法を示す断面図である。FIG. 3 is a sectional view showing the SMC sheet storage method in the second invention.

符号の説明Explanation of symbols

１‥ＳＭＣシ−ト、
２‥ＳＭＣ、
３‥キャリアフィルム（スチレンガス透過性フィルム）、
４‥キャリアフィルム（スチレンガス不透過性フィルム）、
１６‥巻き取り装置、
２０‥ＳＭＣシ−ト収納箱、
２１‥スチレンガス不透過性フィルム。 1 ... SMC sheet
2 ... SMC,
3. Carrier film (styrene gas permeable film),
4. Carrier film (styrene gas impermeable film),
16 ... winding device,
20. SMC sheet storage box
21 ... Styrene gas impermeable film.

Claims (4)

両面をフィルムにて覆われたＳＭＣシ−トにおいて、フィルムの一方がスチレンガス透過性フィルムであり、フィルムの他方がスチレンガス不透過性フィルムであることを特徴とするスチレン放散量を低減したＳＭＣシ−ト。   SMC sheet with both sides covered with a film, wherein one of the films is a styrene gas permeable film and the other of the films is a styrene gas impermeable film. Sheet. 前記スチレンガス不透過性フィルムが、ポリアミド、ポリビニルアルコ−ル、ポリエチレンテレフタレ−ト、及びこれらの層を含む多層フィルムである請求項１記載のＳＭＣシ−ト。   2. The SMC sheet according to claim 1, wherein the styrene gas-impermeable film is polyamide, polyvinyl alcohol, polyethylene terephthalate, and a multilayer film including these layers. 一方面がスチレンガス透過性フィルムであり、他方面がスチレンガス不透過性フィルムで覆われた請求項１に記載のＳＭＣシ−トを収納するに際して、ＳＭＣシ−トを収納箱内につづら折りに、かつ、最上面にスチレンガス不透過性フィルムが来るように折り込まれ、収納箱の上面を当該スチレンガス不透過性フィルムにて覆ったことを特徴とするＳＭＣシ−トの収納法。   2. When storing the SMC sheet according to claim 1, wherein one side is a styrene gas permeable film and the other side is covered with a styrene gas impermeable film, the SMC sheet is folded in a storage box. A method of storing an SMC sheet, wherein the styrene gas impermeable film is folded on the uppermost surface and the upper surface of the storage box is covered with the styrene gas impermeable film. 一方面がスチレンガス透過性フィルムであり、他方面がスチレンガス不透過性フィルムで覆われた請求項１に記載のＳＭＣシ−トを収納するに際して、ＳＭＣシ−トをロ−ル巻きに、かつ、ロ−ルの最上面にスチレンガス不透過性フィルムが来るように巻き込まれ、ロ−ルの最上面を当該スチレンガス不透過性フィルムにて覆ったことを特徴とするＳＭＣシ−トの収納法。   When storing the SMC sheet according to claim 1, wherein one side is a styrene gas permeable film and the other side is covered with a styrene gas impermeable film, the SMC sheet is wound into a roll. The SMC sheet is characterized in that the styrene gas impermeable film is wound on the top surface of the roll so that the top surface of the roll is covered with the styrene gas impermeable film. Storage method.
JP2005373594A 2005-12-26 2005-12-26 Smc sheet reduced in diffusion amount of styrene and its housing method Withdrawn JP2007175880A (en)

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