JP4871977B2 - Resin molded body - Google Patents
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- JP4871977B2 JP4871977B2 JP2009153440A JP2009153440A JP4871977B2 JP 4871977 B2 JP4871977 B2 JP 4871977B2 JP 2009153440 A JP2009153440 A JP 2009153440A JP 2009153440 A JP2009153440 A JP 2009153440A JP 4871977 B2 JP4871977 B2 JP 4871977B2
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Description
本発明は、付香成分を含有する樹脂成形体に関する。 The present invention relates to a resin molded body containing a scented component.
従来、家具、電化製品の枠体等に用いられ、芳香を感じさせる機能を有するものとして、熱可塑性樹脂からなり、付香成分を含有する樹脂成形体が知られている。前記樹脂成形体は、前記芳香成分が放出されることにより、該付香成分が使用者に芳香として認識されることが期待される。 2. Description of the Related Art Conventionally, a resin molded body made of a thermoplastic resin and containing a scented component has been known as one used for furniture, frames of electrical appliances, and the like and having a function of feeling a fragrance. It is expected that the scented component is recognized as a scent by the user by releasing the scented component.
前記樹脂成形体として、付香成分を外部雰囲気に曝露可能な連続気泡を備える発泡体からなるものが提案されている（例えば特許文献１参照）。前記連続気泡を備える樹脂成形体は、前記付香成分が該連続気孔を介して外部雰囲気に曝露されることにより、該付香成分が非常に迅速に放出されるとされている。 As the resin molded body, there has been proposed a resin molded body made of a foam including open cells capable of exposing a scented component to an external atmosphere (see, for example, Patent Document 1). The resin molded body having the open cells is said to release the scented component very rapidly when the scented component is exposed to the external atmosphere through the continuous pores.
しかしながら、前記連続気泡を備える樹脂成形体は、前記付香成分が非常に迅速に外部へ放出されるために、香りを持続することができないという不都合がある。 However, the resin molded body provided with the open cells has a disadvantage that the scent cannot be maintained because the scented component is released to the outside very quickly.
そこで、前記不都合を解消するために、本発明は、優れた香り持続性を備える樹脂成形体を提供することを目的とする。 Then, in order to eliminate the said inconvenience, an object of this invention is to provide the resin molding provided with the outstanding fragrance sustainability.
前記目的を達成するために、本発明は、熱可塑性樹脂からなり、表面に形成された非発泡層と内部に形成された発泡層とを備える樹脂成形体であって、該発泡層は、表面に近い側から順に、第１の発泡層と、第１の発泡層より平均孔径の小さな気泡を備える第２の発泡層と、第１の発泡層より平均孔径の大きな気泡を備える第３の発泡層とからなり、該樹脂成形体は、付香成分を含有することを特徴とする。 In order to achieve the above object, the present invention is a resin molded body comprising a non-foamed layer formed on a surface and a foamed layer formed inside, which is made of a thermoplastic resin. In order from the side closer to the first foamed layer, the second foamed layer having bubbles having an average pore diameter smaller than that of the first foamed layer, and the third foam having bubbles having an average pore diameter larger than that of the first foamed layer. The resin molded body comprises a scented component.
本発明の樹脂成形体によれば、含有されている付香成分は、発泡層の気泡内に保持されている。このうち、表面に近い第１の発泡層に保持されている付香成分が、非発泡層を介して外部へ移動することにより、該付香成分が放出される。また、表面から遠い第３の発泡層に保持されている付香成分が、表面に近い第１の発泡層に移動することにより、付香成分の放出が持続される。 According to the resin molded body of the present invention, the contained scented component is held in the bubbles of the foam layer. Of these, the scented component held in the first foam layer close to the surface moves to the outside through the non-foamed layer, whereby the scented component is released. Moreover, the fragrance | flavor component currently hold | maintained at the 3rd foam layer far from the surface moves to the 1st foam layer near the surface, and discharge | release of a fragrance | flavor component is maintained.
ここで、第３の発泡層は、第１の発泡層より平均孔径の大きな気泡を備えることにより、該気泡内に付香成分を大量に保持することができる。また、第３の発泡層と第１の発泡層との間に存在する第２の発泡層は、第１の発泡層より平均孔径の小さな気泡を備えることにより、第３の気泡に保持されている付香成分の第１の発泡層への移動を抑制することができる。 Here, the third foamed layer includes bubbles having a larger average pore diameter than the first foamed layer, so that a large amount of the scented component can be held in the bubbles. In addition, the second foam layer existing between the third foam layer and the first foam layer is held in the third foam by including bubbles having an average pore diameter smaller than that of the first foam layer. The movement of the scented component to the first foam layer can be suppressed.
したがって、本発明の樹脂成形体によれば、付香成分の外部への放出を長期間に亘って継続して行うことができ、すなわち、優れた香り持続性を得ることができる。 Therefore, according to the resin molded body of the present invention, it is possible to continuously release the scented component to the outside over a long period of time, that is, it is possible to obtain excellent scent sustainability.
また、本発明の樹脂成形体において、前記付香成分として、例えば、ヒノキチオール、トロポノイド、α−ツヤプリシン、γ−ツヤプリシン、β−ドラブリンからなる群から選択される少なくとも１種を用いることができる。 In the resin molded body of the present invention, for example, at least one selected from the group consisting of hinokitiol, troponoid, α-tyaprisin, γ-tyaprisin, and β-drabrin can be used as the perfuming component.
また、本発明の樹脂成形体は、平均粒子径が１〜１０００μｍの範囲である木粉を、前記熱可塑性樹脂１００重量部に対して３０〜７０重量部の範囲で含むことが好ましい。本発明の樹脂成形体は、木粉を前記範囲で含むことにより、熱可塑性樹脂の樹脂量を低減することができるとともに、廃棄の際に一般廃棄物として焼却処理することが可能になる。 Moreover, it is preferable that the resin molding of this invention contains the wood powder whose average particle diameter is 1-1000 micrometers in the range of 30-70 weight part with respect to 100 weight part of said thermoplastic resins. By including wood powder in the above range, the resin molded body of the present invention can reduce the resin amount of the thermoplastic resin and can be incinerated as a general waste at the time of disposal.
前記木粉の含有量が、熱可塑性樹脂１００重量部に対して３０重量部未満では、該熱可塑性樹脂の樹脂量を低減する効果が十分ではなく、７０重量部を超えると該木粉を該熱可塑性樹脂に混合すること自体難しくなるので、いずれも好ましくない。 When the content of the wood powder is less than 30 parts by weight with respect to 100 parts by weight of the thermoplastic resin, the effect of reducing the resin amount of the thermoplastic resin is not sufficient. Since mixing with a thermoplastic resin itself becomes difficult, neither is preferable.
また、前記木粉は、平均粒子径を１μｍ未満とするには特殊な装置を必要とし、平均粒子径が１０００μｍを超えると前記熱可塑性樹脂に混合すること自体難しくなるので、いずれも好ましくない。 Moreover, since the said wood powder requires a special apparatus in order to make an average particle diameter less than 1 micrometer, since it will become difficult to mix with the said thermoplastic resin when an average particle diameter exceeds 1000 micrometers, neither is preferable.
また、前記木粉を含む本発明の樹脂成形体において、該木粉として、前記付香成分を含有するものを用いてもよい。 Moreover, in the resin molded body of the present invention containing the wood powder, the wood powder containing the scented component may be used.
次に、添付の図面を参照しながら本発明の実施の形態についてさらに詳しく説明する。 Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.
図１に示すように、本実施形態の樹脂成形体１は、木粉を含む熱可塑性樹脂からなり、表面に形成された非発泡層２と、内部に形成された発泡層３とを備え、付香成分を含有している。非発泡層２は、結晶粒界や空孔等を介して付香成分を外部へ放出させることが可能となっている。発泡層３は、表面に近い側から順に、第１の発泡層３ａと、第１の発泡層より平均孔径の小さな気泡を備える第２の発泡層３ｂと、第１の発泡層より平均孔径の大きな気泡を備える第３の発泡層３ｃとから構成されている。 As shown in FIG. 1, the resin molded body 1 of the present embodiment is made of a thermoplastic resin containing wood powder, and includes a non-foamed layer 2 formed on the surface and a foamed layer 3 formed inside, Contains scented ingredients. The non-foamed layer 2 can release a scented component to the outside through a crystal grain boundary, a hole, or the like. The foam layer 3 has, in order from the side closer to the surface, the first foam layer 3a, the second foam layer 3b having bubbles having an average pore diameter smaller than that of the first foam layer, and the average pore diameter of the first foam layer. It is comprised from the 3rd foaming layer 3c provided with a big bubble.
第１の発泡層３ａは、平均径が１０〜１００μｍの気泡を備えており、第２の発泡層３ｂは平均径が５〜５０μｍの気泡を備えている。また、第３の発泡層３ｃは平均径が２０〜５００μｍの気泡を備えている。前記発泡層３の気泡の平均径は、例えば、樹脂成形体１の断面を電子顕微鏡により観察し、各気泡の最大径の平均値を求めることにより得ることができる。 The first foam layer 3a includes bubbles having an average diameter of 10 to 100 μm, and the second foam layer 3b includes bubbles having an average diameter of 5 to 50 μm. The third foam layer 3c includes bubbles having an average diameter of 20 to 500 μm. The average diameter of the bubbles in the foam layer 3 can be obtained, for example, by observing the cross section of the resin molded body 1 with an electron microscope and determining the average value of the maximum diameters of the respective bubbles.
樹脂成形体１を構成する熱可塑性樹脂は、それ自体公知のものを用いることができ、例えば、ポリエチレン、ポリプロピレン、ポリエステル、ポリ乳酸等を挙げることができる。 As the thermoplastic resin constituting the resin molded body 1, known ones can be used, and examples thereof include polyethylene, polypropylene, polyester, polylactic acid and the like.
一方、樹脂成形体１に含有される木粉としては、ヒノキ、スギ、マツ、アスナロ、ニオイヒバ、木曽ヒノキ、青森ヒバ、ローソンヒノキ、ベニヒ、ベイヒバ、タイワンヒノキ、ヌマヒノキ、ホソイトスギ等を用いることができる。前記木粉は、それ自体が付香成分を含有するものを用いてもよく、付香成分を含有しないものを用いてもよい。前記木粉は、溶融状態の前記熱可塑性樹脂に均一に混合するために、平均粒子径が１〜１０００μｍの範囲である必要があり、好ましくは１０〜５００μｍの範囲である。このような木粉は、例えば、木片をボールミルに投入して粉砕する等の方法で得ることができる。 On the other hand, cypress, cedar, pine, asunaro, scented cypress, Kiso cypress, Aomori cypress, Lawson cypress, Benihi, bay hiba, taiwan cypress, pine cypress, Japanese cedar, etc. can be used as the wood powder contained in resin molded body 1. . The wood powder itself may contain a scented component or may not contain a scented component. The wood powder needs to have an average particle diameter in the range of 1 to 1000 μm, and preferably in the range of 10 to 500 μm, in order to be uniformly mixed with the thermoplastic resin in the molten state. Such wood flour can be obtained by, for example, a method of putting a piece of wood into a ball mill and crushing it.
樹脂成形体１は、前記範囲の平均粒子径を備える前記木粉を、前記熱可塑性樹脂１００重量部に対して３０〜７０重量部の範囲、好ましくは４０〜６０重量部の範囲で含んでいる。 The resin molded body 1 contains the wood flour having an average particle diameter in the above range in a range of 30 to 70 parts by weight, preferably in a range of 40 to 60 parts by weight with respect to 100 parts by weight of the thermoplastic resin. .
この結果、樹脂成形体１は、樹脂量を低減して軽量化することができると共に、優れた強度を得ることができる。樹脂成形体１は、天然の木材の風合いを備えており、例えば、家具、電化製品の枠体、自動車内装部品、浴槽の蓋、トイレ壁材、キッチン部材等の用途に用いることができる。 As a result, the resin molded body 1 can be reduced in weight by reducing the amount of resin and can have excellent strength. The resin molded body 1 has a texture of natural wood, and can be used for applications such as furniture, electrical appliance frames, automobile interior parts, bathtub lids, toilet wall materials, kitchen members, and the like.
また、樹脂成形体１に含有される付香成分は、それ自体公知のものを用いることができ、例えば、ヒノキチオール、トロポノイド、α−ツヤプリシン、γ−ツヤプリシン、β−ドラブリンを挙げることができる。樹脂成形体１に含有される付香成分は、１つでもよく、また複数であってもよい。 Moreover, the perfume component contained in the resin molding 1 can use a well-known thing, for example, hinokitiol, troponoid, (alpha)-tsuyapricin, (gamma)-tsuyapricin, (beta) -drabrin can be mentioned. The scented component contained in the resin molding 1 may be one or plural.
本実施形態の樹脂成形体１によれば、含有されている付香成分は、発泡層３の気泡内に保持されている。このうち、表面に近い第１の発泡層３ａに保持されている付香成分が、非発泡層２を介して外部へ移動することにより、該付香成分が放出される。また、表面から遠い第３の発泡層３ｃに保持されている付香成分が、表面に近い第１の発泡層３ａに移動することにより、付香成分の放出が持続される。 According to the resin molded body 1 of the present embodiment, the contained scented component is held in the bubbles of the foam layer 3. Among these, the scented component held in the first foamed layer 3a close to the surface moves to the outside through the non-foamed layer 2, whereby the scented component is released. Moreover, the fragrance | flavor component currently hold | maintained at the 3rd foam layer 3c far from the surface moves to the 1st foam layer 3a close | similar to the surface, and discharge | release of a fragrance | flavor component is maintained.
ここで、第３の発泡層３ｃは、第１の発泡層３ａより平均孔径の大きな気泡を備えることにより、該気泡内に付香成分を大量に保持することができる。また、第３の発泡層３ｃと第１の発泡層３ａとの間に存在する第２の発泡層３ｂは、第１の発泡層３ａより平均孔径の小さな気泡を備えることにより、第３の気泡３ｃに保持されている付香成分の第１の発泡層３ａへの移動を抑制することができる。 Here, the 3rd foam layer 3c can hold | maintain a fragrance | flavor component in large quantities in this bubble by providing the bubble with a larger average hole diameter than the 1st foam layer 3a. Further, the second foam layer 3b existing between the third foam layer 3c and the first foam layer 3a is provided with bubbles having an average pore diameter smaller than that of the first foam layer 3a. The movement to the 1st foaming layer 3a of the fragrance | flavor component currently hold | maintained at 3c can be suppressed.
したがって、本実施形態の樹脂成形体１によれば、付香成分の外部への放出を長期間に亘って継続して行うことができ、すなわち、優れた香り持続性を得ることができる。 Therefore, according to the resin molded body 1 of the present embodiment, it is possible to continuously release the scented component to the outside over a long period of time, that is, it is possible to obtain excellent scent sustainability.
次に、樹脂成形体１の製造方法について説明する。樹脂成形体１は、例えば、図２に示す射出成形装置１１を用いて製造することができる。 Next, the manufacturing method of the resin molding 1 is demonstrated. The resin molded body 1 can be manufactured using, for example, an injection molding apparatus 11 shown in FIG.
図２に示す射出成形装置１１は、シリンダー１２と、シリンダー１２により熱可塑性樹脂が射出される金型１３とを備えている。シリンダー１２は、モータ１４により回転駆動される回転軸部１５を内部に備えると共に、熱可塑性樹脂と木粉と付香成分とを供給するホッパー１６と、超臨界状態の流体を供給する超臨界流体供給部１７とを備えている。 An injection molding apparatus 11 shown in FIG. 2 includes a cylinder 12 and a mold 13 into which a thermoplastic resin is injected by the cylinder 12. The cylinder 12 includes a rotary shaft portion 15 that is rotationally driven by a motor 14, a hopper 16 that supplies thermoplastic resin, wood powder, and a scented component, and a supercritical fluid that supplies a fluid in a supercritical state. And a supply unit 17.
ホッパー１６はシリンダー１２の金型１３と反対側の端部付近に備えられ、超臨界流体供給部１７はホッパー１６の下流側でシリンダー１２の中央部付近に備えられている。超臨界流体供給部１７は、超臨界状態の流体を発生させる超臨界流体発生装置１８と、超臨界流体発生装置１８で発生された超臨界状態の流体をシリンダー１２に向けて搬送する流体導管１９と、流体導管１９の途中に介装された計量装置２０とを備える。流体導管１９は遮断弁２１を介してシリンダー１２に接続されている。 The hopper 16 is provided near the end of the cylinder 12 opposite to the mold 13, and the supercritical fluid supply unit 17 is provided near the center of the cylinder 12 on the downstream side of the hopper 16. The supercritical fluid supply unit 17 includes a supercritical fluid generator 18 that generates a fluid in a supercritical state, and a fluid conduit 19 that transports the supercritical fluid generated by the supercritical fluid generator 18 toward the cylinder 12. And a metering device 20 interposed in the middle of the fluid conduit 19. The fluid conduit 19 is connected to the cylinder 12 via a shut-off valve 21.
また、シリンダー１２は、金型１３側の先端にノズル２２を備えると共に、外周面に複数の加熱装置２３ａを備えている。ノズル２２は、外周面に加熱装置２３ｂを備えると共に、遮断弁２４を介して金型１３に接続されている。 The cylinder 12 is provided with a nozzle 22 at the tip on the mold 13 side and a plurality of heating devices 23a on the outer peripheral surface. The nozzle 22 includes a heating device 23 b on the outer peripheral surface, and is connected to the mold 13 through a shut-off valve 24.
回転軸１５は、金型１３と反対側の端部でモータ１４に接続されると共に、外周面に設けられた螺旋状のスクリュー２５と、金型１３側の最先端部に設けられたスクリューヘッド２６とを備えている。スクリュー２５は、基端側連続スクリュー２５ａと、不連続スクリュー２５ｂと、先端側連続スクリュー２５ｃとからなる。 The rotary shaft 15 is connected to the motor 14 at the end opposite to the mold 13, and has a spiral screw 25 provided on the outer peripheral surface, and a screw head provided at the most distal end on the mold 13 side. 26. The screw 25 includes a proximal end side continuous screw 25a, a discontinuous screw 25b, and a distal end side continuous screw 25c.
基端側連続スクリュー２５ａは、モータ１４側の端部から、ホッパー１６の下部を通って超臨界流体供給部１７の下部の手前までの部分に設けられている。また、不連続スクリュー２５ｂは、超臨界流体供給部１７の下方部分に設けられ、回転軸１５の周方向に沿って複数の不連続部を備えている。そして、先端側連続スクリュー２５ｃは、不連続スクリュー２５ｂとスクリューヘッド２６との間に設けられている。 The proximal-side continuous screw 25 a is provided in a portion from the end portion on the motor 14 side to the lower portion of the supercritical fluid supply portion 17 through the lower portion of the hopper 16. The discontinuous screw 25 b is provided at a lower portion of the supercritical fluid supply unit 17 and includes a plurality of discontinuous portions along the circumferential direction of the rotating shaft 15. The distal-side continuous screw 25 c is provided between the discontinuous screw 25 b and the screw head 26.
金型１３は、樹脂成形体１の外側形状に沿う形状の凹部２７を備える固定型２８と、凹部２７に嵌合されてキャビティ２９を形成する凸部３０を備える可動型３１とからなる。固定型２８は、シリンダー１２に連通するスプルー３２と、スプルー３２に連通すると共に、ゲート３３を介してキャビティ２９に連通するランナー３４を備えている。 The mold 13 includes a fixed mold 28 having a concave portion 27 shaped along the outer shape of the resin molded body 1 and a movable die 31 having a convex portion 30 that is fitted in the concave portion 27 to form a cavity 29. The fixed mold 28 includes a sprue 32 communicating with the cylinder 12 and a runner 34 communicating with the sprue 32 and communicating with the cavity 29 via the gate 33.
一方、可動型３１は、凸部３０を支持する支持基盤３５と、支持基盤３５をキャビティ２９方向に進退させるピストンロッド３６とを備えている。ピストンロッド３６は、図示しないシリンダ等の外部駆動源に接続されている。 On the other hand, the movable die 31 includes a support base 35 that supports the convex portion 30 and a piston rod 36 that moves the support base 35 forward and backward in the direction of the cavity 29. The piston rod 36 is connected to an external drive source such as a cylinder (not shown).
射出成形装置１１は、可動型３１の凸部３０を固定型２８の凹部２７に嵌合してキャビティ２９を形成した状態で、ピストンロッド３６により支持基盤３５を介して凸部３０をキャビティ２９方向に進退させることができる。この結果、凸部３０をキャビティ２９に対して後退させることにより、キャビティ２９の容積を拡大（コアバック）することができ、凸部３０をキャビティ２９に対して前進させることにより、キャビティ２９の容積を縮小（コアプッシュ）することができる。 In the state where the convex portion 30 of the movable mold 31 is fitted into the concave portion 27 of the fixed mold 28 and the cavity 29 is formed, the injection molding apparatus 11 moves the convex portion 30 toward the cavity 29 by the piston rod 36 via the support base 35. You can move forward and backward. As a result, the volume of the cavity 29 can be expanded (core back) by retracting the protrusion 30 with respect to the cavity 29, and the volume of the cavity 29 can be increased by moving the protrusion 30 forward with respect to the cavity 29. Can be reduced (core push).
射出成形装置１１では、まず、ホッパー１６からシリンダー１２内に、前記熱可塑性樹脂を投入する。前記熱可塑性樹脂は、シリンダー１２内で加熱装置２３ａの加熱下に連続スクリュー２５ａで攪拌されることにより溶融し、溶融樹脂を形成する。 In the injection molding apparatus 11, first, the thermoplastic resin is charged into the cylinder 12 from the hopper 16. The thermoplastic resin is melted by being stirred by the continuous screw 25a while being heated by the heating device 23a in the cylinder 12 to form a molten resin.
次に、ホッパー１６からシリンダー１２内に、前記木粉を投入する。前記木粉の投入量は、前記熱可塑性樹脂１００重量部に対し、例えば３０〜７０重量部の範囲である。次に、ホッパー１６からシリンダー１２内に、前記付香成分を投入する。前記付香成分の投入量は、前記熱可塑性樹脂１００重量部に対し、例えば０．１〜５重量部の範囲である。尚、前記木粉及び前記付香成分は、予め前記熱可塑性樹脂と混合してペレットとしておき、該ペレットをホッパー１６からシリンダー１２内に投入してもよい。 Next, the wood powder is put into the cylinder 12 from the hopper 16. The input amount of the wood flour is, for example, in the range of 30 to 70 parts by weight with respect to 100 parts by weight of the thermoplastic resin. Next, the scented component is charged into the cylinder 12 from the hopper 16. The amount of the scented component to be added is, for example, in the range of 0.1 to 5 parts by weight with respect to 100 parts by weight of the thermoplastic resin. The wood flour and the scented component may be mixed with the thermoplastic resin in advance to form pellets, and the pellets may be charged into the cylinder 12 from the hopper 16.
前記木粉及び前記付香成分は、シリンダー１２内で加熱装置２３ａの加熱下に連続スクリュー２５ａで攪拌されることにより、前記溶融樹脂に均一に混合され、溶融状態の木粉及び付香成分を含有する熱可塑性樹脂組成物（以下、「付香成分含有溶融樹脂」と略記する）が形成される。前記のように形成された付香成分含有溶融樹脂は、連続スクリュー２５ａにより、金型１３方向に搬送される。 The wood flour and the scented component are uniformly mixed with the molten resin by stirring with a continuous screw 25a under the heating of the heating device 23a in the cylinder 12, and the wood powder and scented component in a molten state are mixed. The contained thermoplastic resin composition (hereinafter abbreviated as “scented component-containing molten resin”) is formed. The scented component-containing molten resin formed as described above is conveyed in the direction of the mold 13 by the continuous screw 25a.
次に、超臨界流体供給部１７から、前記付香成分含有溶融樹脂の０．０５〜２質量％の範囲の超臨界状態の流体を供給し、加圧下に該付香成分含有溶融樹脂に含浸する。前記流体としては、二酸化炭素または窒素を用いることができる。 Next, a supercritical fluid in a range of 0.05 to 2% by mass of the scented component-containing molten resin is supplied from the supercritical fluid supply unit 17, and the scented component-containing molten resin is impregnated under pressure. To do. Carbon dioxide or nitrogen can be used as the fluid.
前記超臨界状態の流体は、超臨界流体供給部１７の下方部分に設けられた不連続スクリュー２５ｂにより攪拌され、前記溶融樹脂と十分に混合され、含浸せしめられる。この結果、スクリューヘッド２６とノズル２２との間のシリンダー１２内に、前記付香成分含有溶融樹脂に前記超臨界状態の流体が含浸せしめられる。このとき、前記付香成分含有溶融樹脂は、発泡のための核が未形成の状態にある。 The fluid in the supercritical state is stirred by a discontinuous screw 25b provided in a lower portion of the supercritical fluid supply unit 17, and is sufficiently mixed with the molten resin and impregnated. As a result, the cylinder 12 between the screw head 26 and the nozzle 22 is impregnated with the supercritical fluid in the scented component-containing molten resin. At this time, the scented component-containing molten resin is in a state where the core for foaming is not formed.
次に、前記超臨界状態の流体が含浸せしめられた前記付香成分含有溶融樹脂をノズル２２から、スプルー３２、ランナー３４、ゲート３３を介してキャビティ２９に射出する。このとき、キャビティ２９は、凸部３０が所定量前進せしめられることにより所定の容積とされている。 Next, the scented component-containing molten resin impregnated with the supercritical fluid is injected from the nozzle 22 into the cavity 29 through the sprue 32, runner 34, and gate 33. At this time, the cavity 29 has a predetermined volume as the convex portion 30 is advanced by a predetermined amount.
前記付香成分含有溶融樹脂の温度ＬＴは、図３に示すように、キャビティ２９に射出された後、所定時間を経過するまでは上昇するが、その後下降に転じる。また、前記付香成分含有溶融樹脂の圧力Ｌｐは、前記温度の上昇に伴って上昇し一旦は臨界圧力Ｐｃを超える。しかし、前記温度の下降開始後、前記付香成分含有溶融樹脂の圧力Ｌｐもまた下降に転じる。 Temperature L T of the perfuming ingredient-containing molten resin, as shown in FIG. 3, after being injected into the cavity 29, but until passage of a predetermined time to rise, turns thereafter lowered. Further, the pressure L p of the scented component-containing molten resin increases as the temperature increases, and once exceeds the critical pressure Pc. However, after lowering the start of the temperature, pressure L p of the perfuming ingredient-containing molten resin also starts to descend.
そして、図３に示す時間ｔ１で前記付香成分含有溶融樹脂の圧力Ｌｐが臨界圧力Ｐｃよりも低くなると、含浸されている超臨界状態の流体が非超臨界状態となって気泡を生じ、該付香成分含有溶融樹脂中に第１の発泡体層３ａを形成する。また、前記付香成分含有溶融樹脂のキャビティ２９の内壁に接する部分には、非発泡層２が形成される。 When the pressure L p of the scented component-containing molten resin becomes lower than the critical pressure Pc at time t 1 shown in FIG. 3, the impregnated supercritical fluid becomes a non-supercritical state and generates bubbles. The first foam layer 3a is formed in the perfumed component-containing molten resin. In addition, the non-foamed layer 2 is formed in a portion in contact with the inner wall of the cavity 29 of the fragrant component-containing molten resin.
次に、時間ｔ１から所定の時間が経過したならば、時間ｔ２において、ピストンロッド３６により支持基盤３５を介して凸部３０をキャビティ２９から所定量だけ後退させる。この結果、キャビティ２９の容積が拡大され、前記付香成分含有溶融樹脂の圧力Ｌｐが、該付香成分含有溶融樹脂の温度ＬＴの低下に伴う圧力Ｌｐの低減速度よりも大きな第１の速度で低減される。前記第１の速度は、例えば５０〜１００ＭＰａ／秒の範囲とする。このようにすると、第１の発泡体層３ａ中に、第１の発泡体層３ａよりも気泡の平均孔径の小さい第２の発泡層３ｂが形成される。 Next, if a predetermined time has elapsed from time t 1 , at time t 2 , the protrusion 30 is retracted from the cavity 29 by a predetermined amount via the support base 35 by the piston rod 36. As a result, volume of the cavity 29 is expanded, the pressure L p of the perfuming ingredient-containing molten resin, the pressure L p larger first than reduce the rate of with decreasing temperature L T of該付incense ingredient-containing molten resin Reduced at a speed of The first speed is, for example, in the range of 50 to 100 MPa / second. If it does in this way, the 2nd foam layer 3b in which the average hole diameter of a bubble is smaller than the 1st foam layer 3a will be formed in the 1st foam layer 3a.
次に、前記付香成分含有溶融樹脂の圧力Ｌｐを第１の速度で低減させる操作を所定時間行った後、時間ｔ３において、ピストンロッド３６により支持基盤３５を介して凸部３０をキャビティ２９からさらに所定量だけ後退させる。この結果、キャビティ２９の容積がさらに拡大され、前記付香成分含有溶融樹脂の圧力Ｌｐが、第２の速度で低減される。 Next, after the operation of reducing the pressure L p of the scented component-containing molten resin at a first speed is performed for a predetermined time, the convex portion 30 is cavityd by the piston rod 36 via the support base 35 at time t 3 . 29 is further retracted by a predetermined amount. As a result, volume of the cavity 29 is further enlarged, the pressure L p of the perfuming ingredient-containing molten resin is reduced at the second rate.
前記第２の速度は、第１の速度より小さく、例えば５〜３０ＭＰａ／秒の範囲とする。このようにすると、第２の発泡体層３ｂより内側に、第１の発泡体層３ａよりも平均孔径の大きい気泡を備える層が形成される。 The second speed is smaller than the first speed, for example, in the range of 5 to 30 MPa / second. If it does in this way, the layer provided with the bubble with a larger average hole diameter than the 1st foam layer 3a will be formed inside the 2nd foam layer 3b.
ところで、前記付香成分含有溶融樹脂の圧力Ｌｐを第２の速度で低減させる操作を行った後、そのまま該付香成分含有溶融樹脂を固化させると、該付香成分含有溶融樹脂温度ＬＴの低下に伴って第２の発泡層３ｂより内側の層の気泡が巨大化する。そして、この場合、巨大化した気泡により得られた樹脂成形体１の強度が損なわれる虞がある。 Meanwhile, after performing an operation of reducing the pressure L p of the perfuming ingredient-containing molten resin in the second speed, as when solidifying the該付incense ingredient-containing molten resin,該付aroma component-containing molten resin temperature L T With the decrease, the bubbles in the layer inside the second foamed layer 3b become enormous. And in this case, there exists a possibility that the intensity | strength of the resin molding 1 obtained by the enlarged bubble may be impaired.
そこで、次に、前記付香成分含有溶融樹脂の温度ＬＴが前記熱可塑性樹脂のガラス転位温度Ｔｇに７０℃を加えた温度以下になる前の時間ｔ４において、ピストンロッド３６により支持基盤３５を介して凸部３０をキャビティ２９に対して所定量だけ前進させる。この結果、キャビティ２９の容積が縮小され、前記付香成分含有溶融樹脂の圧力Ｌｐが増加される。 Accordingly, next, at time t 4 before the temperature L T of the perfuming ingredient-containing molten resin to a temperature below plus 70 ° C. to a glass transition temperature Tg of the thermoplastic resin, the support base 35 by a piston rod 36 The convex portion 30 is advanced by a predetermined amount with respect to the cavity 29 via. As a result, the volume of the cavity 29 is reduced, and the pressure L p of the scented component-containing molten resin is increased.
このようにすると、第２の発泡層３ｂより内側で巨大化した気泡が圧縮されて、微細化し、第１の発泡体層３ａよりも平均孔径の大きい気泡を備え、巨大化した気泡の無い第３の発泡体層３ｃが形成される。 In this way, the enlarged bubbles inside the second foam layer 3b are compressed and refined, and the first foam layer 3a is provided with bubbles having an average pore diameter larger than that of the first foam layer 3a. 3 foam layers 3c are formed.
その後、前記付香成分含有溶融樹脂の温度ＬＴ及び圧力Ｌｐを自然に降下させ、該付香成分含有溶融樹脂を固化させることにより、図１に示す構成を備える樹脂成形体１を得ることができる。 Thereafter, the temperature L T and the pressure L p of the scented component-containing molten resin are naturally lowered to solidify the scented component-containing molten resin, thereby obtaining a resin molded body 1 having the configuration shown in FIG. Can do.
１…樹脂成形体、 ２…非発泡層、 ３…発泡層、 ３ａ…第１の発泡層、 ３ｂ…第２の発泡層、 ３ｃ…第３の発泡層。 DESCRIPTION OF SYMBOLS 1 ... Resin molded object, 2 ... Non-foamed layer, 3 ... Foamed layer, 3a ... 1st foamed layer, 3b ... 2nd foamed layer, 3c ... 3rd foamed layer.
Claims (4)
該発泡層は、表面に近い側から順に、第１の発泡層と、第１の発泡層より平均孔径の小さな気泡を備える第２の発泡層と、第１の発泡層より平均孔径の大きな気泡を備える第３の発泡層とからなり、
該樹脂成形体は、付香成分を含有することを特徴とする樹脂成形体。 A resin molded body comprising a thermoplastic resin and comprising a non-foamed layer formed on the surface and a foamed layer formed inside,
The foamed layer includes, in order from the side closer to the surface, a first foamed layer, a second foamed layer having air bubbles having a smaller average pore diameter than the first foamed layer, and air bubbles having a larger average pore diameter than the first foamed layer. A third foam layer comprising
The resin molded body contains a scented component.
前記付香成分は、ヒノキチオール、トロポノイド、α−ツヤプリシン、γ−ツヤプリシン、β−ドラブリンからなる群から選択される少なくとも１種であることを特徴とする樹脂成形体。 In the resin molded product according to claim 1,
The scented component is at least one selected from the group consisting of hinokitiol, troponoid, α-tyaprisin, γ-tyaprisin, and β-drabrin.
該樹脂成形体は、平均粒子径が１〜１０００μｍの範囲である木粉を、前記熱可塑性樹脂１００重量部に対して３０〜７０重量部の範囲で含むことを特徴とする樹脂成形体。 In the resin molded product according to claim 1 and claim 2,
The resin molded body contains wood powder having an average particle diameter of 1 to 1000 µm in a range of 30 to 70 parts by weight with respect to 100 parts by weight of the thermoplastic resin.
前記木粉は、前記付香成分を含有することを特徴とする樹脂成形体。 In the resin molded product according to claim 3,
The said wood powder contains the said fragrance | flavor component, The resin molding characterized by the above-mentioned.
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| JP2009153440A JP4871977B2 (en) | 2009-06-29 | 2009-06-29 | Resin molded body |
| US13/381,362 US8361612B2 (en) | 2009-06-29 | 2010-06-07 | Wood powder-containing resin molded product and method for producing the same |
| PCT/JP2010/059593 WO2011001791A1 (en) | 2009-06-29 | 2010-06-07 | Wood powder-containing resin molded article and method for producing the same |
| CN201080029438.2A CN102470576B (en) | 2009-06-29 | 2010-06-07 | Wood powder-containing resin molded article and method for producing the same |
| CA 2764098 CA2764098C (en) | 2009-06-29 | 2010-06-07 | Wood powder-containing resin molded article and method for producing the same |
| EP20100793961 EP2441558B1 (en) | 2009-06-29 | 2010-06-07 | Wood powder-containing resin molded article |
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