JPH04267135A - Preparation of in-mold formed molded product - Google Patents
Preparation of in-mold formed molded productInfo
- Publication number
- JPH04267135A JPH04267135A JP3111246A JP11124691A JPH04267135A JP H04267135 A JPH04267135 A JP H04267135A JP 3111246 A JP3111246 A JP 3111246A JP 11124691 A JP11124691 A JP 11124691A JP H04267135 A JPH04267135 A JP H04267135A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- cavity
- particles
- molded product
- steam
- 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.)
- Granted
Links
- 239000002245 particle Substances 0.000 claims abstract description 32
- 239000006260 foam Substances 0.000 claims abstract description 25
- 239000011324 bead Substances 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 230000006835 compression Effects 0.000 abstract description 3
- 238000007906 compression Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 9
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 8
- -1 polypropylene Polymers 0.000 description 7
- 239000000178 monomer Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000005187 foaming Methods 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 239000011162 core material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004794 expanded polystyrene Substances 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- SBYMUDUGTIKLCR-UHFFFAOYSA-N 2-chloroethenylbenzene Chemical compound ClC=CC1=CC=CC=C1 SBYMUDUGTIKLCR-UHFFFAOYSA-N 0.000 description 1
- JLBJTVDPSNHSKJ-UHFFFAOYSA-N 4-Methylstyrene Chemical compound CC1=CC=C(C=C)C=C1 JLBJTVDPSNHSKJ-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 229920001890 Novodur Polymers 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 239000012809 cooling fluid Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010097 foam moulding Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 229950011008 tetrachloroethylene Drugs 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Landscapes
- Laminated Bodies (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は軟弱地盤の埋め立て用材
、電化製品等の重量物の包装用コーナーパット等に有用
な型内ビーズ発泡成形品の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an in-mold bead foam molded product useful for reclamation of soft ground, corner pads for packaging heavy items such as electrical appliances, and the like.
【０００２】0002
【従来の技術】ポリスチレン、ポリプロピレン、ポリエ
チレン等を原料とする型内ビーズ発泡成形品が市販され
ており、これらの成形品は軽量性、断熱性、緩衝特性等
に優れているため、各種の包装材、容器、建築用断熱材
、自動車用バンパーの芯材等に広く用いられている。[Prior Art] In-mold bead foam molded products made from polystyrene, polypropylene, polyethylene, etc. are commercially available, and these molded products have excellent lightness, heat insulation, and cushioning properties, so they are used in various packaging. It is widely used for materials such as wood, containers, thermal insulation materials for buildings, and core materials for automobile bumpers.
【０００３】0003
【発明が解決しようとする課題】上記用途においては、
一般に軽重性及び圧縮強度が高いことが要求される。従
来、型内ビーズ発泡成形品の圧縮強度を上げる方法とし
ては、発泡倍率を低くする、言い換えると、密度を高く
するといった方法がある。この方法によると、製品重量
が増すとか、コストがアップするとか、緩衝性が低下す
るという問題がある。[Problem to be solved by the invention] In the above application,
Generally, it is required to be lightweight and have high compressive strength. Conventionally, as a method of increasing the compressive strength of an in-mold bead foam molded product, there is a method of lowering the expansion ratio, in other words, increasing the density. According to this method, there are problems such as an increase in product weight, an increase in cost, and a decrease in cushioning properties.
【０００４】特に、軟弱地盤の埋め立て用材（実開平１
−１２０５３３号公報、実開昭６３−１９４９４８公報
）は、寸法が縦１０００ｍｍ、横２０００ｍｍ、高さ５
００ｍｍのブロック（密度が０．０２ｇ／ｃｍ３）で、
１個の重量が２０ｋｇもある。軽い（密度が低い）ブロ
ックで同一圧縮強度のものが存在すれば、その１個の重
量を小さくすることが可能であり、運搬等の取扱いが容
易となるばかりか、材料コストも低減できる。このよう
なことは長さが１５００ｍｍ、幅が１２０ｍｍ、高さが
１００〜１５０ｍｍである自動車用バンパーの芯材につ
いても同様である。[0004] In particular, materials for reclamation of soft ground
-120533 publication, Utility Model Application Publication No. 1989-194948) has dimensions of 1000 mm in length, 2000 mm in width, and 5 in height.
00mm block (density 0.02g/cm3),
Each piece weighs 20 kg. If light (low density) blocks with the same compressive strength exist, it is possible to reduce the weight of each block, which not only makes handling such as transportation easier, but also reduces material costs. This also applies to the core material of an automobile bumper, which has a length of 1500 mm, a width of 120 mm, and a height of 100 to 150 mm.
【０００５】同一素材、同一密度の型内ビーズ発泡成形
品においては、気泡径が小さい程圧縮強度が大きいと言
われている。 かかる気泡径の調整にはセル調整材が
使用されているが、気泡径の調整による圧縮強度の向上
は多くを期待できないのが現状であって、その向上はそ
こが知れている。It is said that in in-mold bead foam molded products made of the same material and the same density, the smaller the cell diameter, the higher the compressive strength. Although cell adjustment materials are used to adjust the cell diameter, it is currently not possible to expect much improvement in compressive strength by adjusting the cell diameter, and this improvement is well known.
【０００６】本発明は上記の問題に鑑みてなされたもの
で、その目的は同一素材であって、密度が同じ発泡体で
あっても、圧縮強度のより高い型内ビーズ発泡成形品を
得るための製造方法を提供することにある。The present invention was made in view of the above problems, and its purpose is to obtain an in-mold bead foam molded product with higher compressive strength even when the foam is made of the same material and has the same density. The purpose of this invention is to provide a method for manufacturing the same.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、本発明の特徴とする型内ビーズ発泡成形品の製造方
法は予備発泡粒子をキャビティの容積変化が可能な金型
内に充填し、この粒子群をスチーム等により加熱発泡さ
せて互いに融着させながら、又は融着させて該粒子間の
隙間が残っている発泡体を得た後、上記金型の一方の割
型或いは双方の割型を移動させることにより上記金型の
キャビティ内の容積を１．１〜２倍に増大させて、この
キャビティ内で上記発泡体を加熱膨脹させることにより
、該キャビティの形状に忠実な発泡成形体を形成し、次
いで、この発泡成形体を冷却するものである。[Means for Solving the Problems] In order to achieve the above object, the method for manufacturing an in-mold bead foam molded product, which is a feature of the present invention, involves filling pre-expanded particles into a mold whose cavity volume can be changed. After heating and foaming this particle group with steam or the like to fuse them together or fuse them to obtain a foam in which gaps remain between the particles, one or both of the split molds of the above-mentioned mold are By moving the split mold, the volume inside the cavity of the mold is increased by 1.1 to 2 times, and the foam is heated and expanded within this cavity, thereby forming a foam molding that is faithful to the shape of the cavity. The foamed molded product is then cooled.
【０００８】しかして、この製造方法に使用される予備
発泡粒子、例えばスチレン系樹脂の予備発泡粒子は、プ
ロパン、ブタン、ペンタン、ヘキサン等の脂肪酸炭化水
素、又は塩化メチル、テトラクロルエチレン等のハロゲ
ン化炭化水素、或いは石油エーテル等の易揮発性物質を
膨脹剤として、粒子中にこの膨脹剤を２〜１５重量部含
むスチレン系樹脂粒子を撹拌しながらスチームにより加
熱し、密度を０．０１５〜０．１５ｇ／ｃｍ３、粒子径
を２〜８ｍｍの大きさに予備発泡させて成るものである
。また、スチレン系樹脂としては、スチレン、メチルス
チレン、クロロスチレン等のスチレン系単量体の単独重
合体、又はこの種の単量体相互間の共重合体、或いはこ
の種の単量体と他の重合性中量体、例えばブタジエン、
イソプレン、塩化ビニル、メチルメタアクリレート等と
の共重合体が使用される。[0008] The pre-expanded particles used in this production method, for example, the pre-expanded particles of styrene resin, are made of fatty acid hydrocarbons such as propane, butane, pentane, hexane, etc., or halogens such as methyl chloride, tetrachloroethylene, etc. Styrenic resin particles containing 2 to 15 parts by weight of this swelling agent in the particles are heated with steam while stirring to have a density of 0.015 to 0.015 using a readily volatile substance such as hydrogenated hydrocarbon or petroleum ether as an expansion agent. It is made by pre-foaming to a particle size of 0.15 g/cm3 and a particle size of 2 to 8 mm. In addition, the styrene resin may be a homopolymer of styrene monomers such as styrene, methylstyrene, or chlorostyrene, or a copolymer of these monomers, or a combination of this type of monomer and other monomers. polymerizable intermediates such as butadiene,
Copolymers with isoprene, vinyl chloride, methyl methacrylate, etc. are used.
【０００９】更に、本発明において、発泡体の膨脹及び
圧縮は、発泡体の原料樹脂が可塑性をもたらす温度（ポ
リスチレンでは７５〜８０℃）以上の温度で行われる。
本発明を実施するに、予備発泡粒子を最初にスチーム加
熱するのみで膨脹時及び圧縮時に発泡体は該熱変形温度
以上の温度であるので、外部からの加熱は必要でないが
、必要に応じては外部から加熱してもよい。また、予備
発泡粒子としてはポリプロピレン、低密度ポリエチレン
、高密度ポリエチレン及び線状ポリエチレン等の熱可塑
性樹脂の予備発泡粒子も使用できる。Furthermore, in the present invention, the expansion and compression of the foam are carried out at a temperature higher than the temperature at which the raw material resin of the foam becomes plastic (75 to 80° C. for polystyrene). In carrying out the present invention, only the pre-expanded particles are first heated with steam, and the foam is at a temperature above the heat distortion temperature during expansion and compression, so external heating is not necessary. may be heated externally. Pre-expanded particles of thermoplastic resins such as polypropylene, low-density polyethylene, high-density polyethylene, and linear polyethylene can also be used as the pre-expanded particles.
【００１０】0010
【実施例】先ず、本発明方法の実施に使用される金型の
１例を図面を参照しながら説明する。図１において、１
はキャビティ２の容積を変化きる金型で、離接自在な割
型１ａと割型１ｂにより形成されている。３は両割型１
ａ，１ｂの接触面（パーテイングライン）である。４は
加熱流体（スチーム）や冷却流体（水）を導入するチャ
ンバー、５はスチームは通過できるが、予備発泡粒子は
通過できないように両割型１ａ，１ｂに穿設されている
多数の孔、６は割型１ｂ側に穿設した成形材料の充填口
、７は該充填口６に装着した充填ガンで、送気管８によ
り供給される圧縮空気によって予備発泡粒子をキャビテ
ィ２内に充填できる機能を有している。９はホッパー（
図示せず）側に連なる材料供給管、１０は上記充填口６
を開閉するピストンである。[Example] First, an example of a mold used for carrying out the method of the present invention will be explained with reference to the drawings. In Figure 1, 1
1 is a mold that can change the volume of the cavity 2, and is formed by a split mold 1a and a split mold 1b that can be freely moved into and out of contact. 3 is double split type 1
This is the contact surface (parting line) between a and 1b. 4 is a chamber for introducing heating fluid (steam) and cooling fluid (water); 5 is a large number of holes drilled in the split molds 1a and 1b so that steam can pass through but not pre-foamed particles; Reference numeral 6 indicates a filling port for molding material formed on the side of the split mold 1b, and 7 indicates a filling gun attached to the filling port 6, which has a function of filling pre-expanded particles into the cavity 2 using compressed air supplied from an air supply pipe 8. have. 9 is the hopper (
(not shown) side, a material supply pipe 10 is the above-mentioned filling port 6
It is a piston that opens and closes the
【００１１】次ぎに、上記金型１を使用しての本発明方
法を説明する。予備発泡粒子を、割型１ａと割型１ｂの
接触面３が１ｍｍ離れている状態の金型１のキャビティ
２内に充填ガン７を用いて充填し、充填口６を閉じた後
で、圧力が０．５〜５ｋｇ／ｃｍ２Ｇのスチームを割型
１ｂのチャンバー４内に５〜１０秒間導入し、粒子間に
存在する空気をできるかぎり除去した後、割型１ａと１
ｂを接触させ、次いで、両割型１ａ，１ｂのチャンバー
４内に同圧のスチームを約２０〜１００秒間導入して上
記粒子群を加熱し、膨脹させると共に粒子相互を融着さ
せる。この際、粒子の融着は隙間がない完全な密着状態
でなく、次の加熱工程で加熱のためのスチームが通過で
きるような空隙を５〜３０％残しておく必要がある。Next, the method of the present invention using the mold 1 described above will be explained. The pre-expanded particles are filled into the cavity 2 of the mold 1 with the contact surfaces 3 of the split molds 1a and 1b separated by 1 mm using the filling gun 7, and after the filling port 6 is closed, the pressure is Steam of 0.5 to 5 kg/cm2G is introduced into the chamber 4 of the split mold 1b for 5 to 10 seconds to remove as much air as possible between the particles, and then the split molds 1a and 1
Then, steam of the same pressure is introduced into the chambers 4 of the two split molds 1a and 1b for about 20 to 100 seconds to heat and expand the particles and fuse the particles together. At this time, the particles are not completely adhered to each other with no gaps, but it is necessary to leave 5 to 30% of voids through which steam for heating can pass in the next heating step.
【００１２】次いで、金型１を開いてキャビティ２の容
積を１．１〜２倍に増大させ、かつ、チャンバー４内に
スチームを導入して発泡体を膨脹ささせた後（図２を参
照）、冷却水を約３０秒間チャンバー４内に導いて該発
泡成形体を冷却し、その後で金型１を開き成形品を得る
。この成形品ｆの断面は、図３に示すように金型１を開
いた方向（矢印）の気泡径がその直角方向の径よりも大
であり、この方向に対する圧縮強度がこれの直角方向の
圧縮強度より大となる。この場合、型開きによるキャビ
ティ２の容積増大が１．１倍より低いと、得られる発泡
成形体は圧縮強度の向上が見られず、また、２倍を越す
と、表面が平滑な成形品（金型のキャビティ形状に忠実
な成形品）を得ることはできない。Next, the mold 1 is opened to increase the volume of the cavity 2 by 1.1 to 2 times, and steam is introduced into the chamber 4 to expand the foam (see FIG. 2). ), cooling water is introduced into the chamber 4 for about 30 seconds to cool the foamed molded product, and then the mold 1 is opened to obtain a molded product. In the cross section of this molded product f, as shown in Fig. 3, the bubble diameter in the direction (arrow) in which the mold 1 is opened is larger than the diameter in the direction perpendicular to it, and the compressive strength in this direction is It is greater than the compressive strength. In this case, if the volume increase of the cavity 2 due to mold opening is less than 1.1 times, the compressive strength of the obtained foamed molded product will not improve, and if it exceeds 2 times, the molded product with a smooth surface ( It is not possible to obtain a molded product that is faithful to the shape of the mold cavity.
【００１３】実施例１
図１に示す金型１を用い、このキャビティ２（縦が５０
０ｍｍ、横が５００ｍｍ、高さが２００ｍｍ）内にポリ
スチレン予備発泡粒子〔三菱油化バーデイツシエ株式会
社製のＪＦ−１５１（商品名）、嵩密度が０．０３ｇ／
ｃｍ３〕を充填し、次いで、０．６ｋｇ／ｃｍ２Ｇのス
チームを５秒間キャビティ２内に導入して脱気した後、
同圧のスチームを２０秒間導入して空隙率が約１０％の
発泡体を得た（第１工程）。そして、この発泡体を冷却
することなく、８０℃以上の温度であるうちに金型１を
３０％開き（型開き速度は６８ｍ／秒）、０．６ｋｇ／
ｃｍ２Ｇのスチームを１５秒間導入し、発泡を完全にさ
せてキャビティ形状に忠実な発泡成形体（縦が５００ｍ
ｍ、横が５００ｍｍ、高さが２６０ｍｍ）とし（第２工
程）、次いで、チャンバー４内に２０℃の水を１５秒間
導入し、更に５分間放冷した後で型開きし、密度が約０
．０２３ｇ／ｃｍ３の表面が平滑な成形品（金型のキャ
ビティ形状に忠実な型内ビーズ発泡成形体）を得た。
この発泡成形体の高さ方向の５％ひずみ時の圧縮強度は
２．０４ｋｇ／ｃｍ２で、これと直角の方向の５％ひず
み時の圧縮強度は１．４５ｋｇ／ｃｍ２であった。Example 1 Using the mold 1 shown in FIG.
Pre-expanded polystyrene particles [JF-151 (trade name) manufactured by Mitsubishi Yuka Verdice Co., Ltd., bulk density 0.03 g/
cm3], and then 0.6 kg/cm2G of steam was introduced into the cavity 2 for 5 seconds to degas it.
Steam of the same pressure was introduced for 20 seconds to obtain a foam with a porosity of about 10% (first step). Then, without cooling this foam, the mold 1 was opened by 30% while the temperature was 80°C or higher (mold opening speed was 68 m/sec), and the mold 1 was opened at 0.6 kg/sec.
Steam of cm2G was introduced for 15 seconds to complete foaming, resulting in a foamed molded product that was faithful to the cavity shape (length: 500m).
m, width 500 mm, height 260 mm) (second step), then 20°C water was introduced into the chamber 4 for 15 seconds, and after cooling for another 5 minutes, the mold was opened and the density was about 0.
．． A molded product (in-mold bead foamed molded product faithful to the shape of the mold cavity) with a weight of 0.023 g/cm3 and a smooth surface was obtained. The compressive strength of this foam molded article at 5% strain in the height direction was 2.04 kg/cm2, and the compressive strength at 5% strain in the direction perpendicular to this was 1.45 kg/cm2.
【００１４】比較例１
図１に示す金型１を用い、この金型１のキャビティ２（
縦が５００ｍｍ、横が５００ｍｍ、高さが２００ｍｍ）
内にポリスチレン予備発泡粒子〔三菱油化バーデイツシ
エ株式会社製のＪＦ−１５１（商品名）、嵩密度が０．
０３ｇ／ｃｍ３〕を充填し、次いで、０．６ｋｇ／ｃｍ
２Ｇのスチームを５秒間キャビティ２内に導入して脱気
した後、同圧のスチームを３５秒間導入した。次いで、
チャンバー４内に２０℃の水を１５秒間導入し、更に５
分間放冷した後で型開きし、密度が約０．０３ｇ／ｃｍ
３の型内ビーズ発泡成形体（縦が５００ｍｍ、横が５０
０ｍｍ、高さが２００ｍｍ）を得た。この発泡成形体の
高さ方向の５％ひずみ時の圧縮強度は２．４０ｋｇ／ｃ
ｍ２で、これと直角の方向の５％ひずみ時の圧縮強度は
２．３７ｋｇ／ｃｍ２でった。Comparative Example 1 Using the mold 1 shown in FIG. 1, the cavity 2 of this mold 1 (
(length: 500mm, width: 500mm, height: 200mm)
Pre-expanded polystyrene particles [JF-151 (trade name) manufactured by Mitsubishi Yuka Verdice Co., Ltd., with a bulk density of 0.
03g/cm3], then 0.6kg/cm
After 2G of steam was introduced into the cavity 2 for 5 seconds to degas it, steam of the same pressure was introduced for 35 seconds. Then,
Water at 20°C was introduced into chamber 4 for 15 seconds, and then
After cooling for a minute, the mold is opened and the density is approximately 0.03g/cm.
3 in-mold bead foam molded product (length: 500 mm, width: 50 mm)
0 mm and a height of 200 mm). The compressive strength of this foam molded product at 5% strain in the height direction is 2.40 kg/c
m2, the compressive strength at 5% strain in the direction perpendicular to this was 2.37 kg/cm2.
【００１５】実施例２〜３及び比較例２〜３嵩密度の異
なる予備発泡粒子を用いる他は実施例１．比較例１とそ
れぞれ同様に製造して表１に示すような発泡成形体を得
た。Examples 2-3 and Comparative Examples 2-3 Example 1 except that pre-expanded particles having different bulk densities were used. The foamed molded products shown in Table 1 were produced in the same manner as in Comparative Example 1.
【００１６】実施例４
前記実施例１において金型を３０％開く代わリに６０％
と変更する他は同様に製造して、金型のキャビティ形状
に忠実な発泡成形体（表１を参照）を得た。Example 4 Instead of opening the mold by 30% in Example 1, the mold was opened by 60%.
A foamed molded article (see Table 1) faithful to the mold cavity shape was obtained by manufacturing in the same manner except for the following changes.
【００１７】[0017]
【表１】[Table 1]
【００１８】上記表１に示すように、本発明の製造方法
により得られる型内ビーズ発泡成形品の型開きした方向
の圧縮強度は通常品（比較例）に比べると、約３０〜４
０％向上していることが理解できる。As shown in Table 1 above, the compressive strength in the mold opening direction of the in-mold bead foam molded product obtained by the manufacturing method of the present invention is about 30 to 4
It can be seen that there is an improvement of 0%.
【００１９】[0019]
【発明の効果】本発明は上記の如くであって、同一素材
であって、密度が同じ発泡体であっても、圧縮強度のよ
り高い型内ビーズ発泡成形品を製造でき、材料の節約が
可能で大巾にコストダウンできることと相俟って、その
経済的効果は多大である。[Effects of the Invention] The present invention is as described above, and even if the foams are made of the same material and have the same density, an in-mold bead foam molded product with higher compressive strength can be manufactured, and material can be saved. Coupled with the fact that it is possible and the cost can be drastically reduced, the economic effect is enormous.
【図１】 本発明製造方法の実施に用いる金型の断面
図であって、予備発泡粒子を充填した時の初期成形段階
を示す図である。FIG. 1 is a cross-sectional view of a mold used for implementing the manufacturing method of the present invention, showing an initial molding stage when filled with pre-expanded particles.
【図２】 終期成形段階における金型の断面図である
。FIG. 2 is a cross-sectional view of the mold at the final molding stage.
【図３】 成形品の一部拡大断面図である。FIG. 3 is a partially enlarged sectional view of the molded product.
Claims (1)
が可能な金型内に充填し、この粒子群を加熱発泡させて
互いに融着させながら、又は融着させて該粒子間の隙間
が残っている発泡体を得た後、上記金型の一方の割型或
いは双方の割型を移動させることにより上記金型のキャ
ビティ内の容積をｌ．１〜２倍に増大させて、このキャ
ビティ内で上記発泡体を加熱膨脹させることにより、該
キャビティの形状に忠実な発泡成形体を形成し、次いで
、この発泡成形体を冷却することを特徴とする型内ビー
ズ発泡成形品の製造方法。Claim 1: Pre-expanded particles are filled into a mold that can change the volume of the cavity, and the particles are heated and foamed to fuse each other, or are fused so that no gaps remain between the particles. After obtaining the foam, the volume inside the cavity of the mold is reduced to l. by moving one or both of the mold halves. The foam is increased by 1 to 2 times and heated and expanded in this cavity to form a foamed molded product that is faithful to the shape of the cavity, and then this foamed molded product is cooled. A method for manufacturing an in-mold bead foam molded product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3111246A JP2785076B2 (en) | 1991-02-21 | 1991-02-21 | Method for producing bead-in-mold molded product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3111246A JP2785076B2 (en) | 1991-02-21 | 1991-02-21 | Method for producing bead-in-mold molded product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04267135A true JPH04267135A (en) | 1992-09-22 |
| JP2785076B2 JP2785076B2 (en) | 1998-08-13 |
Family
ID=14556299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3111246A Expired - Fee Related JP2785076B2 (en) | 1991-02-21 | 1991-02-21 | Method for producing bead-in-mold molded product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2785076B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102020113838A1 (en) | 2020-05-22 | 2021-11-25 | Siegfried Hofmann Gmbh | Molding tool for processing expandable or expanded plastic particles |
-
1991
- 1991-02-21 JP JP3111246A patent/JP2785076B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102020113838A1 (en) | 2020-05-22 | 2021-11-25 | Siegfried Hofmann Gmbh | Molding tool for processing expandable or expanded plastic particles |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2785076B2 (en) | 1998-08-13 |
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