JP2000141470A - Production of resin molded article reduced in weight and resin molded article - Google Patents
Production of resin molded article reduced in weight and resin molded articleInfo
- Publication number
- JP2000141470A JP2000141470A JP10320642A JP32064298A JP2000141470A JP 2000141470 A JP2000141470 A JP 2000141470A JP 10320642 A JP10320642 A JP 10320642A JP 32064298 A JP32064298 A JP 32064298A JP 2000141470 A JP2000141470 A JP 2000141470A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- filler
- resin molded
- foaming agent
- molded product
- 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
Landscapes
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Molding Of Porous Articles (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Biological Depolymerization Polymers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は軽量化された樹脂成
形物の製造方法および樹脂成形物に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a lightweight resin molded product and a resin molded product.
【０００２】[0002]
【従来の技術】従来から軽量化および／またはコストダ
ウンされた樹脂成形物を得る目的で、樹脂を発泡させた
り、樹脂にフィラーを添加することがしばしば行われて
いる。特に、対象となる樹脂が高価である生分解性樹脂
である場合、これらの手段は有効である。2. Description of the Related Art Conventionally, for the purpose of obtaining a resin molded product which is reduced in weight and / or cost, it is often practiced to foam the resin or to add a filler to the resin. In particular, when the target resin is an expensive biodegradable resin, these means are effective.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、生分解
性樹脂の大半はポリエステル系であるため発泡させにく
いという問題があり、また高価な化学発泡剤を用いても
通常は２〜３倍の発泡体しか得られず、しかも発泡させ
るためには高度の制御が必要である。However, since most of the biodegradable resins are polyester-based, they have a problem that they are difficult to foam. Even if an expensive chemical foaming agent is used, the foam is usually two to three times as large. And a high degree of control is required for foaming.
【０００４】一方、フィラーを添加した場合は、原材料
費のコストダウンは添加量分だけのコストダウンにしか
ならない。On the other hand, when a filler is added, the cost reduction of raw material costs can only be reduced by the added amount.
【０００５】本発明の目的は、これらの問題を解消し、
得られる樹脂成形物の更なるコストダウンと軽量化を達
成することにある。It is an object of the present invention to overcome these problems,
It is to achieve further cost reduction and weight reduction of the obtained resin molded product.
【０００６】[0006]
【問題点を解決するための手段】本発明者は上述の問題
を解決すべく検討した結果、樹脂にフィラーを添加する
ことで得られる樹脂成形物のコストダウンが可能である
とともに、延伸という比較的簡単な手段で樹脂成形物中
に空隙が形成されるため、得られる樹脂成形物の更なる
コストダウンと軽量化が可能であることを見いだし、本
発明を完成した。Means for Solving the Problems The present inventor has studied to solve the above-mentioned problems, and as a result, it is possible to reduce the cost of a resin molded product obtained by adding a filler to the resin, and to compare the cost of stretching. Since voids are formed in the resin molded product by simple and simple means, it has been found that the cost and weight of the obtained resin molded product can be further reduced, and the present invention has been completed.
【０００７】すなわち本発明の軽量化された樹脂成形物
の製造方法は、樹脂とフィラーとを混合、溶融して押し
出し、延伸することを特徴とするものである。なお図１
は本発明の製造方法の概略を示す説明図の例である。図
示するように、本発明において必要に応じて顔料、可塑
剤、安定剤などの添加剤を配合してもよいことはいうま
でもない。本発明における延伸操作は通常の延伸装置を
使用することができる。また、軽量化率は表１の実施例
９〜１５、比較例６に示すように延伸比で制御でき、破
断しない範囲内で延伸比を大にすることで、軽量化率を
大とすることが可能である。That is, the method for producing a lightweight resin molded product of the present invention is characterized by mixing, melting, extruding and stretching a resin and a filler. FIG. 1
FIG. 1 is an example of an explanatory view schematically showing a production method of the present invention. As shown in the figure, it goes without saying that additives such as pigments, plasticizers and stabilizers may be blended as required in the present invention. The stretching operation in the present invention can use a usual stretching apparatus. Further, the weight reduction rate can be controlled by the stretching ratio as shown in Examples 9 to 15 and Comparative Example 6 in Table 1, and by increasing the stretching ratio within a range not breaking, the weight reduction rate is increased. Is possible.
【０００８】[0008]
【発明の実施の形態】本発明において発泡剤を使用する
場合は、樹脂と発泡剤とフィラーとを混合、溶融して押
し出し、発泡させて気泡を形成させた後、延伸すること
により、軽量化された樹脂成形物を得ることができる。
発泡剤としては、化学発泡剤、物理発泡剤のいずれを用
いてもよい。BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, when a foaming agent is used, a resin, a foaming agent and a filler are mixed, melted, extruded, foamed to form bubbles, and then stretched to reduce the weight. A molded resin product can be obtained.
As the blowing agent, any of a chemical blowing agent and a physical blowing agent may be used.
【０００９】本発明において使用する樹脂の種類として
は格別の制限はなくすべての樹脂が対象であるが、ポリ
乳酸などの生分解性樹脂は汎用の樹脂と比べて高価であ
るため、特に生分解性樹脂に対して本発明を適用するこ
とが好ましい。There is no particular limitation on the type of resin used in the present invention, and all kinds of resins are applicable. However, since biodegradable resins such as polylactic acid are more expensive than general-purpose resins, they are particularly biodegradable. It is preferable to apply the present invention to a conductive resin.
【００１０】本発明においてフィラーとしては特に制限
はないが、一般的には樹脂に不溶である増量材を使用す
ることが好ましい。そのようなフィラーとして例えば炭
酸カルシウム、クレー、タルク、珪藻土などの天然鉱物
や、デンプン、セルロースパウダー、木粉、オカラ、モ
ミ殻、フスマなどの天然有機物を挙げることができ、こ
れらのフィラーの１種または２種以上を適宜選択して使
用することが好ましい。In the present invention, the filler is not particularly limited, but it is generally preferable to use a filler which is insoluble in the resin. Examples of such fillers include natural minerals such as calcium carbonate, clay, talc, and diatomaceous earth, and natural organic substances such as starch, cellulose powder, wood flour, okara, fir husk, and bran. One of these fillers Alternatively, it is preferable to appropriately select and use two or more kinds.
【００１１】[0011]
【作用】図２に示すように樹脂とフィラーとを混合、溶
融して押し出し、延伸することにより、樹脂成形物中に
空隙が形成されて見掛け密度が小さくなり軽量化された
樹脂成形物が得られる。As shown in FIG. 2, by mixing, melting, extruding, and stretching a resin and a filler, voids are formed in the resin molded product to reduce the apparent density and obtain a lightweight resin molded product. Can be
【００１２】[0012]
【実施例】以下に実施例を挙げて本発明をさらに詳しく
説明するが、本発明はこれらの実施例によって何ら限定
されるものではない。なお、軽量化率は次式で算出し
た： EXAMPLES The present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the present invention. The weight reduction rate was calculated by the following equation:
【００１３】実施例１〜７、比較例１〜４ 生分解性樹脂であるポリ乳酸（三井化学、レイシアＨ−
１００Ｅ）と、フィラーとしてデンプンまたはフスマを
下記の表１に示す割合で２軸押出機に供給し、混合、溶
融させて¢２ｍｍのダイからひも状に押し出し、延伸し
た。その結果を延伸していないものと併せて表１に示
す。 Examples 1 to 7, Comparative Examples 1 to 4 Polylactic acid as a biodegradable resin (Mitsui Chemicals, Lacia H-
100E) and starch or bran as a filler were supplied to a twin-screw extruder at the ratio shown in Table 1 below, mixed, melted, extruded into a string form from a ¢ 2 mm die, and stretched. The results are shown in Table 1 together with those obtained when the film was not stretched.
【００１４】実施例８、比較例５ ポリ乳酸（三井化学、レイシアＨ−１００Ｅ）と、フィ
ラーとしてフスマ（８５０μｍパス）を１２．５％の割
合で単軸の押出機に供給し、水発泡させたものを延伸し
た（実施例８）。その結果を延伸していないものと併せ
て表１に示す。 Example 8 and Comparative Example 5 Polylactic acid (Mitsui Chemicals, Lacia H-100E) and brass (850 μm pass) as a filler were supplied to a single-screw extruder at a rate of 12.5% to cause water foaming. This was stretched (Example 8). The results are shown in Table 1 together with those obtained when the film was not stretched.
【００１５】実施例９〜１５、比較例６ ポリ乳酸（島津製作所、ラクティ ９０５０）と、フィ
ラーとしてモミ殻を粉砕したものを５０％の割合で２軸
押出機に供給し、混合、溶解させてφ２ｍｍのダイから
ひも状に押し出し、延伸した。その結果を延伸していな
いものと併せて表１に示す Examples 9 to 15 and Comparative Example 6 Polylactic acid (Lacti 9050, Shimadzu Corporation) and crushed fir hulls as a filler were fed to a twin screw extruder at a ratio of 50%, mixed and dissolved. It was extruded in a string form from a φ2 mm die and stretched. The results are shown in Table 1 together with the result of unstretching.
【００１６】[0016]
【表１】 [Table 1]
【００１７】表１の結果からわかるように、延伸してい
ないもの（比較例）と比べて、延伸したもの（実施例）
は見掛け密度が著しく小さく、１５〜５０％の軽量化率
を達成したことが明らかである。As can be seen from the results in Table 1, the stretched product (Example) was compared with the unstretched product (Comparative Example).
It is clear that the apparent density was extremely small and achieved a weight reduction ratio of 15 to 50%.
【００１８】[0018]
【発明の効果】以上説明したように本発明によれば、樹
脂にフィラーを添加することで得られる樹脂成形物のコ
ストダウンが可能であるとともに、延伸という比較的簡
単な手段で樹脂成形物中に空隙が形成されるため、得ら
れる樹脂成形物の更なるコストダウンと軽量化が可能で
ある。As described above, according to the present invention, the cost of a resin molded product obtained by adding a filler to a resin can be reduced, and the resin molded product can be formed by a relatively simple means of stretching. Since a void is formed in the resin molded product, it is possible to further reduce the cost and weight of the obtained resin molded product.
【００１９】また、フィラーとして食品廃材などの廃棄
物を使用すれば、安価なフィラーの入手と資源の有効利
用が同時に実現できる。If waste such as food waste is used as the filler, it is possible to simultaneously obtain an inexpensive filler and effectively use resources.
【００２０】また特に、本発明により得られる生分解性
樹脂の成形物は、苗や植木のネームプレート、法面に植
生マットを固定するための杭などとして利用することが
出来る。さらに、シート状に押し出し、延伸して成形し
た後、真空成形などを施せば、苗鉢などとして利用する
ことが出来る。In particular, the molded product of the biodegradable resin obtained by the present invention can be used as a nameplate for seedlings and plants, a pile for fixing a vegetation mat to a slope, and the like. Further, if the sheet is extruded into a sheet, stretched and formed, and then subjected to vacuum forming or the like, it can be used as a seedling pot or the like.
【図１】本発明の軽量化された樹脂成形物の製造方法の
概略を示す説明図である。FIG. 1 is an explanatory view showing an outline of a method for producing a light-weight resin molded product of the present invention.
【図２】未延伸時および延伸時の樹脂成形物の断面を示
す模式図である。FIG. 2 is a schematic view showing a cross section of a resin molded product before and after stretching.
１ ホッパ ２ 押出機本体 ３ ロール ４ 樹脂成形物 DESCRIPTION OF SYMBOLS 1 Hopper 2 Extruder main body 3 Roll 4 Resin molding
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｂ２９Ｋ 511:00 Ｂ２９Ｌ 7:00 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification FI FI Theme Court ゛ (Reference) B29K 511: 00 B29L 7:00
Claims (6)
し、延伸することを特徴とする軽量化された樹脂成形物
の製造方法。1. A method for producing a lightweight resin molded product, comprising mixing, melting, extruding and stretching a resin and a filler.
て押し出し、発泡させて気泡を形成させた後、延伸する
ことを特徴とする軽量化された樹脂成形物の製造方法。2. A method for producing a lightweight resin molded product, comprising mixing, melting and extruding a resin, a foaming agent and a filler, foaming to form cells, and then stretching.
る請求項１または請求項２記載の軽量化された樹脂成形
物の製造方法。3. The method for producing a lightweight resin molded product according to claim 1, wherein the resin is a biodegradable resin.
ク、珪藻土などからなる群から選ばれる少なくとも１種
類以上の天然鉱物であることを特徴とする請求項１〜３
のいずれか１項記載の軽量化された樹脂成形物の製造方
法。4. The filler according to claim 1, wherein the filler is at least one natural mineral selected from the group consisting of calcium carbonate, clay, talc, diatomaceous earth and the like.
The method for producing a lightweight resin molded product according to any one of the above.
ー、木粉、モミ殻、オカラ、フスマなどからなる群から
選ばれる少なくとも１種類以上の天然有機物であること
を特徴とする請求項１〜３のいずれか１項記載の軽量化
された樹脂成形物の製造方法。5. The method according to claim 1, wherein the filler is at least one natural organic substance selected from the group consisting of starch, cellulose powder, wood flour, fir hull, okara, bran and the like. 2. A method for producing a lightweight resin molded product according to claim 1.
方法によって製造された樹脂成形物。6. A resin molded product produced by the production method according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10320642A JP2000141470A (en) | 1998-11-11 | 1998-11-11 | Production of resin molded article reduced in weight and resin molded article |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10320642A JP2000141470A (en) | 1998-11-11 | 1998-11-11 | Production of resin molded article reduced in weight and resin molded article |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000141470A true JP2000141470A (en) | 2000-05-23 |
Family
ID=18123698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10320642A Pending JP2000141470A (en) | 1998-11-11 | 1998-11-11 | Production of resin molded article reduced in weight and resin molded article |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000141470A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006328225A (en) * | 2005-05-26 | 2006-12-07 | Tohcello Co Ltd | Biodegradable polymer-based foamed oriented film and laminated film |
| JP2008056745A (en) * | 2006-08-29 | 2008-03-13 | Toppan Cosmo Inc | Resin molded product |
| CN101962483A (en) * | 2010-09-01 | 2011-02-02 | 孟庆雄 | Composition material formed by natural cellulose and synthetic resin or polylactic acid |
| JP2016050210A (en) * | 2014-08-28 | 2016-04-11 | 日本製紙株式会社 | Resin material for molding comprising bran and resin, and method for producing the same, and molded article comprising the resin material for molding |
| CN108178908A (en) * | 2017-12-27 | 2018-06-19 | 吕玲 | A kind of environment-friendly type plastic food package box and preparation method thereof |
| JP2018196358A (en) * | 2017-05-24 | 2018-12-13 | みかど化工株式会社 | Mulch film for agriculture |
| JP2019071817A (en) * | 2017-10-13 | 2019-05-16 | みかど化工株式会社 | Agricultural mulch film |
-
1998
- 1998-11-11 JP JP10320642A patent/JP2000141470A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006328225A (en) * | 2005-05-26 | 2006-12-07 | Tohcello Co Ltd | Biodegradable polymer-based foamed oriented film and laminated film |
| JP2008056745A (en) * | 2006-08-29 | 2008-03-13 | Toppan Cosmo Inc | Resin molded product |
| CN101962483A (en) * | 2010-09-01 | 2011-02-02 | 孟庆雄 | Composition material formed by natural cellulose and synthetic resin or polylactic acid |
| JP2016050210A (en) * | 2014-08-28 | 2016-04-11 | 日本製紙株式会社 | Resin material for molding comprising bran and resin, and method for producing the same, and molded article comprising the resin material for molding |
| JP2018196358A (en) * | 2017-05-24 | 2018-12-13 | みかど化工株式会社 | Mulch film for agriculture |
| JP2019071817A (en) * | 2017-10-13 | 2019-05-16 | みかど化工株式会社 | Agricultural mulch film |
| JP7055328B2 (en) | 2017-10-13 | 2022-04-18 | みかど化工株式会社 | Agricultural mulch film |
| CN108178908A (en) * | 2017-12-27 | 2018-06-19 | 吕玲 | A kind of environment-friendly type plastic food package box and preparation method thereof |
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