JP7535302B2 - Manufacturing method of molding material - Google Patents
Manufacturing method of molding material Download PDFInfo
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- JP7535302B2 JP7535302B2 JP2020204402A JP2020204402A JP7535302B2 JP 7535302 B2 JP7535302 B2 JP 7535302B2 JP 2020204402 A JP2020204402 A JP 2020204402A JP 2020204402 A JP2020204402 A JP 2020204402A JP 7535302 B2 JP7535302 B2 JP 7535302B2
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- 239000012778 molding material Substances 0.000 title claims description 46
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 239000011122 softwood Substances 0.000 claims description 29
- 239000011121 hardwood Substances 0.000 claims description 28
- 229920002472 Starch Polymers 0.000 claims description 27
- 235000019698 starch Nutrition 0.000 claims description 27
- 239000008107 starch Substances 0.000 claims description 27
- 239000011230 binding agent Substances 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 13
- 238000004898 kneading Methods 0.000 claims description 6
- 238000000465 moulding Methods 0.000 description 22
- 238000011156 evaluation Methods 0.000 description 14
- 238000002834 transmittance Methods 0.000 description 13
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 239000000835 fiber Substances 0.000 description 5
- 238000000748 compression moulding Methods 0.000 description 4
- 229910052783 alkali metal Inorganic materials 0.000 description 3
- -1 alkali metal long-chain fatty acid salt Chemical class 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 229920002261 Corn starch Polymers 0.000 description 2
- 239000008120 corn starch Substances 0.000 description 2
- 229940099112 cornstarch Drugs 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011105 molded pulp Substances 0.000 description 1
- 229920001592 potato starch Polymers 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
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- Manufacture Of Macromolecular Shaped Articles (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Description
本発明は、成形材料の製造方法に関するものである。 The present invention relates to a method for producing a molding material.
本出願人はプラスチックに代わる新たな成形技術として、パルプ及び澱粉系結合剤を主成分とする成形材料を用いたパルプ射出成形（Pulp Injection Molding）の技術開発に注力し、これまでにパルプ射出成形に関連する成形材料、製造方法及びこれらの技術を用いた成形品などに関する多くの特許出願を行ってきた（例えば特許文献１～３）。 The applicant has focused on the development of pulp injection molding, a new molding technology that uses molding materials whose main components are pulp and starch-based binders, as an alternative to plastics, and has filed many patent applications relating to molding materials and manufacturing methods related to pulp injection molding, as well as molded products using these technologies (e.g., Patent Documents 1 to 3).
しかしながら、これまでのパルプ射出成形技術ではパルプ成形品を透明化することができず、容器内の確認が必要な透明性を要するプラスチック成形品、例えば使い捨て注射器（シリンジ）のようなものの代替品としてのパルプ成形品を提供することができていない。 However, current pulp injection molding technology has not been able to make pulp molded products transparent, and it has not been possible to provide pulp molded products as replacements for plastic molded products that require transparency so that the inside of the container can be seen, such as disposable syringes.
本発明はこのようなパルプ成形品の現状に鑑みなされたものであり、透明性（光透過性）を有するパルプ成形品を実現可能とするための成形材料の製造方法を提供する。 The present invention has been made in consideration of the current state of pulp molded products, and provides a method for producing a molding material that enables the realization of pulp molded products having transparency (light transmittance).
添付図面を参照して本発明の要旨を説明する。 The gist of the present invention will be explained with reference to the attached drawings.
パルプ及び澱粉系結合剤を主成分とする成形材料の製造方法であって、針葉樹パルプ、広葉樹パルプ、澱粉系結合剤及び水を、下記条件で混合し混練することを特徴とする成形材料の製造方法に係るものである。
記
前記針葉樹パルプ、前記広葉樹パルプ、前記澱粉系結合剤及び前記水を混合した混合物における前記澱粉系結合剤の混合率を３０ｗｔ％～４０ｗｔ％、前記水の混合率を１０ｗｔ％～１５ｗｔ％とし、さらに、前記針葉樹パルプ及び前記広葉樹パルプの混合比（重量）を１：１～１：３とする。
This is a method for producing a molding material whose main components are pulp and a starch-based binder, and is characterized in that softwood pulp, hardwood pulp, a starch-based binder, and water are mixed and kneaded under the following conditions .
Notes
In a mixture of the softwood pulp, the hardwood pulp, the starch-based binder, and the water, the mixing ratio of the starch-based binder is 30 wt % to 40 wt %, the mixing ratio of the water is 10 wt % to 15 wt %, and further the mixing ratio (by weight) of the softwood pulp and the hardwood pulp is 1:1 to 1:3.
また、請求項１記載の成形材料の製造方法において、前記混練を下記条件で行うことを特徴とする成形材料の製造方法に係るものである。
記
温度：６０℃～１００℃
混練速度：８０ｒｐｍ～１２０ｒｐｍ
混練時間：５分以上
The present invention also relates to a method for producing a molding material according to claim 1 , characterized in that the kneading is carried out under the following conditions:
Note Temperature: 60℃~100℃
Mixing speed: 80 rpm to 120 rpm
Mixing time: 5 minutes or more
本発明は上述のように構成したから、透明性（光透過性）を有するパルプ成形品を実現可能とする成形材料の製造方法となる。 Since the present invention is configured as described above, it provides a method for producing a molding material that makes it possible to produce a pulp molded product having transparency (light transmittance).
好適と考える本発明の実施形態を、図面に基づいて本発明の作用を示して簡単に説明する。 The preferred embodiment of the present invention will be briefly explained below, showing the operation of the invention based on the drawings.
本発明の成形材料は、パルプ及び澱粉系結合剤が主成分であり、また、パルプは針葉樹パルプと広葉樹パルプとの混合パルプである。 The molding material of the present invention is mainly composed of pulp and a starch-based binder, and the pulp is a mixture of softwood pulp and hardwood pulp.
針葉樹パルプと広葉樹パルプとでは繊維径及び繊維長が異なり、広葉樹パルプの方が細く短いものとなっている。そのため、この混合パルプと澱粉系結合剤とを混合した際、針葉樹パルプの隙間に広葉樹パルプが入り込み隙間が埋められるため、成形材料中の空隙率が低減され、成形時に気泡ができ難い成形材料となる。 The fiber diameter and length of softwood pulp and hardwood pulp are different, with hardwood pulp being thinner and shorter. Therefore, when this mixed pulp is mixed with a starch-based binder, the hardwood pulp penetrates into the gaps in the softwood pulp, filling them, reducing the porosity in the molding material and resulting in a molding material that is less likely to produce air bubbles during molding.
したがって、本発明の成形材料を用いて射出成形若しくは圧縮成形されるパルプ成形品は、成形品中（部材内部）に気泡がほとんど無く、気泡による光の反射、散乱が低減され、これにより光透過性が向上し、透明性を有するものとなる。 Therefore, pulp molded products that are injection molded or compression molded using the molding material of the present invention have almost no air bubbles in the molded product (inside the component), and the reflection and scattering of light caused by air bubbles is reduced, resulting in improved light transmittance and transparency.
これにより、本発明の成形材料を用いることで、これまで実現できなかった、例えば使い捨て注射器（シリンジ）のような容器内の確認が必要な透明性を必要とする成形品をパルプ成形品で提供することが可能となる。 As a result, by using the molding material of the present invention, it is possible to provide molded pulp products that require transparency, such as disposable syringes, which allow the inside of the container to be checked, something that was not possible before.
本発明の具体的な実施例について図面に基づいて説明する。 Specific examples of the present invention will be described with reference to the drawings.
本実施例は、パルプ及び澱粉系結合剤を主成分とする成形材料を所定条件で圧縮成形することにより得られる透明性（光透過性）を有するパルプ成形品（パルプ圧縮成形品）である。 This example is a pulp molded product (pulp compression molded product) with transparency (light transmittance) obtained by compression molding a molding material whose main components are pulp and a starch-based binder under specified conditions.
まず、本実施例に係る成形材料及びその製造方法について説明する。 First, we will explain the molding material and manufacturing method for this example.
本実施例の成形材料は、パルプ及び澱粉系結合剤を主成分とするものであり、具体的には、パルプと澱粉系結合剤と水とを混合した混合物に非アルカリ金属の長鎖脂肪酸塩を添加して混練したものを所定形状（例えばペレット状）に成形したものである。 The molding material in this embodiment is mainly composed of pulp and a starch-based binder. Specifically, a mixture of pulp, a starch-based binder, and water is mixed with a non-alkali metal long-chain fatty acid salt, which is then kneaded and molded into a desired shape (e.g., pellets).
詳細には、パルプには、針葉樹パルプと広葉樹パルプとが用いられており、針葉樹パルプは繊維長：２ｍｍ前後、繊維径：４０μｍ程度のもの、広葉樹パルプは繊維長：０．９ｍｍ前後、繊維径：２０μｍ程度のものを用いている。 In more detail, softwood pulp and hardwood pulp are used, with the softwood pulp having a fiber length of approximately 2 mm and a fiber diameter of approximately 40 μm, and the hardwood pulp having a fiber length of approximately 0.9 mm and a fiber diameter of approximately 20 μm.
また、これらの混合比は、針葉樹パルプ：広葉樹パルプ＝１：１～１：３（好ましくは針葉樹パルプ：広葉樹パルプ＝１：１）としている。 The mixing ratio of these is softwood pulp: hardwood pulp = 1:1 to 1:3 (preferably softwood pulp: hardwood pulp = 1:1).
また、パルプ全体（針葉樹パルプ及び広葉樹パルプ）と澱粉系結合剤との成分比（重量）は６：４とし、これにより、針葉樹パルプと広葉樹パルプと澱粉系結合剤との成分比（重量）は、針葉樹パルプ：広葉樹パルプ：澱粉系結合剤＝３：３：４～１．５：４．５：４としている。 The component ratio (by weight) of the entire pulp (softwood pulp and hardwood pulp) to the starch-based binder is 6:4, and as a result, the component ratio (by weight) of the softwood pulp, hardwood pulp, and starch-based binder is softwood pulp: hardwood pulp: starch-based binder = 3:3:4 to 1.5:4.5:4.
また、澱粉系結合剤には、コーンスターチが用いられている。なお、澱粉系結合剤としては、このコーンスターチのほか、例えば馬鈴薯澱粉や米粉などを用いても良い。 Cornstarch is used as the starch-based binder. Other starch-based binders such as potato starch and rice flour may also be used.
また、この針葉樹パルプ、広葉樹パルプ及び澱粉系結合剤を混合したものに加える水は、成形材料の１０ｗｔ％～１５ｗｔ％（好ましくは１３ｗｔ％以上）としている。 The amount of water added to the mixture of softwood pulp, hardwood pulp, and starch-based binder is 10 wt% to 15 wt% (preferably 13 wt% or more) of the molding material.
したがって、本実施例の成形材料全体の成分比としては、パルプ：５０ｗｔ％～６０ｗｔ％、澱粉系結合剤：３０ｗｔ％～４０ｗｔ％、水：１０ｗｔ％～１５ｗｔ％となる。 Therefore, the overall component ratio of the molding material in this embodiment is pulp: 50 wt% to 60 wt%, starch-based binder: 30 wt% to 40 wt%, water: 10 wt% to 15 wt%.
また、本実施例の成形材料は、針葉樹パルプと針葉樹パルプを１：１～１：３で混合した混合パルプを５０ｗｔ％～６０ｗｔ％、澱粉系結合剤（コーンスターチ）を３０ｗｔ％～４０ｗｔ％の適宜な割合で混合し、これに１０ｗｔ％～１５ｗｔ％の適宜な水を加えた混合物に適量（本実施例では、前記混合物１００ｗｔ％に対して０．２ｗｔ％～２ｗｔ％）の非アルカリ金属の長鎖脂肪酸塩を添加し、この非アルカリ金属の長鎖脂肪酸塩を添加した混合物１００ｗｔ％に対して３０ｗｔ％～３５ｗｔ％の水を加えて混練処理をした後、ペレット形状に成形することで得られる。 The molding material of this embodiment is obtained by mixing a suitable ratio of 50 wt% to 60 wt% of a mixed pulp obtained by mixing softwood pulp and softwood pulp in a ratio of 1:1 to 1:3, and 30 wt% to 40 wt% of a starch-based binder (corn starch), adding a suitable amount of water of 10 wt% to 15 wt% to this mixture, adding an appropriate amount (in this embodiment, 0.2 wt% to 2 wt% per 100 wt% of the mixture) of a non-alkali metal long-chain fatty acid salt, adding 30 wt% to 35 wt% of water per 100 wt% of the mixture to which the non-alkali metal long-chain fatty acid salt has been added, kneading the mixture, and then molding it into a pellet shape.
なお、本実施例における混練条件は、温度：６０℃～１００℃、混練速度：８０ｒｐｍ～１２０ｒｐｍ、混練時間：５分以上としている。 The kneading conditions in this example are: temperature: 60°C to 100°C, kneading speed: 80 rpm to 120 rpm, kneading time: 5 minutes or more.
次に、上記の成形材料を用いた本実施例の製造（成形）方法について説明する。 Next, we will explain the manufacturing (molding) method of this embodiment using the above molding material.
本実施例は、上述した成形材料を、加圧力：１トン～５トン（好ましくは２トン～４トン）、加圧温度：６０℃～１００℃（好ましくは８０℃～１００℃）、加圧時間：１分～５分（好ましくは２分～４分）のプレス条件で圧縮成形することにより得られる。 This embodiment is obtained by compression molding the above-mentioned molding material under the following press conditions: pressure: 1 ton to 5 tons (preferably 2 to 4 tons), pressure temperature: 60°C to 100°C (preferably 80°C to 100°C), pressure time: 1 minute to 5 minutes (preferably 2 minutes to 4 minutes).
具体的には、成形時の設定肉厚（スペーサを入れて押し切った隙間の厚さ）は、０．１ｍｍ～０．３ｍｍ（好ましくは０．２ｍｍ～０．３ｍｍ）としている。 Specifically, the set thickness during molding (the thickness of the gap when the spacer is inserted and pressed down) is set to 0.1 mm to 0.3 mm (preferably 0.2 mm to 0.3 mm).
なお、成形材料を射出成形処理し、この射出成形処理したものを上記のように圧縮成形しても良い。 Alternatively, the molding material may be injection molded and the resulting injection molded product may be compression molded as described above.
また、後述する評価試験の結果から、成形材料における針葉樹パルプ、広葉樹パルプ、澱粉系結合剤及び水の混合比（重量％）の最適条件は、針葉樹パルプ：広葉樹パルプ：澱粉系結合剤：水＝２６：２６：３５：１３であり、また、この成形材料を用いて成形品を成形する際の成形条件（プレス温度及び設定肉厚）の最適条件は、プレス温度：１００℃、設定肉厚０．２ｍｍであることを確認している。 In addition, the results of the evaluation tests described below have confirmed that the optimal mixture ratio (by weight) of softwood pulp, hardwood pulp, starch-based binder, and water in the molding material is softwood pulp: hardwood pulp: starch-based binder: water = 26:26:35:13, and that the optimal molding conditions (press temperature and set thickness) when molding a molded product using this molding material are press temperature: 100°C, set thickness: 0.2 mm.
上記条件により、所望の耐久性及び透明性を有するパルプ成形品が得られた。 Under the above conditions, a pulp molded product with the desired durability and transparency was obtained.
本実施例のパルプ成形品は、針葉樹パルプと広葉樹パルプとを１：１～１：３の混合比で混合した成形材料を、上述した適正な条件で圧縮成形することにより、成形品中に気泡が生成されず（したがって、界面が生じない。）、これにより、従来にない光透過率が良好な透明性（光透過性）を有するパルプ成形品となり、このように良好な透明性を有することで、これまでパルプ成形品で代替できなかった使い捨て注射器（シリンジ）のような容器内の確認が必要な透明性を必要とするものや照明器具のカバー（シェード）などをパルプ成形品で代替提供することができるようになり、脱プラスチックを促進させることができる。 The pulp molded product of this embodiment is made by compression molding a molding material made of a mixture of softwood pulp and hardwood pulp in a ratio of 1:1 to 1:3 under the appropriate conditions described above, which results in no air bubbles being generated in the molded product (and therefore no interface being generated). This results in a pulp molded product with excellent transparency (light transmittance) and an unprecedented light transmittance. Because of this excellent transparency, it can now be used to replace items that require transparency to check the inside of containers, such as disposable syringes, and lighting fixture covers (shades), which could not be replaced by pulp molded products until now, and this can promote the move away from plastic.
次に、上述した本実施例の効果（本実施例に係る成形材料の混合比、パルプ成形品の成形条件の設定値）を裏付ける透明性評価試験及び光透過性評価試験について説明する。 Next, we will explain the transparency evaluation test and light transmittance evaluation test that support the effects of this embodiment described above (the mixing ratio of the molding materials in this embodiment and the set values of the molding conditions for the pulp molded product).
＜透明性評価試験＞
透明性評価試験では、表１に示す針葉樹パルプ、広葉樹パルプ及び澱粉系結合剤の混合率を変えた５種の成形材料を作成し、これらの成形材料の（１）成形時の温度（プレス温度）差による透明性の変化、（２）成形時の設定肉厚差による透明性の変化、（３）成形材料の水分含有率差による透明性の変化を確認した。
<Transparency evaluation test>
In the transparency evaluation test, five types of molding materials were prepared by changing the mixing ratio of softwood pulp, hardwood pulp, and starch-based binder as shown in Table 1, and the following changes were confirmed: (1) the change in transparency due to the difference in temperature (press temperature) during molding, (2) the change in transparency due to the difference in the set thickness during molding, and (3) the change in transparency due to the difference in moisture content of the molding material.
（１）成形時の温度（プレス温度）による透明性評価試験
本試験では、表１に示す各成形材料を、水分含有量が１３ｗｔ％となるよう水を混合し、プレス温度６０℃、８０℃、１００℃の成形条件（設定肉厚：０．２ｍｍ、プレス圧力：４トン、プレス時間：２分は固定）で圧縮成形（プレス成形）し、得られた各成形品の透明性を判定した。
(1) Transparency evaluation test based on molding temperature (press temperature) In this test, each molding material shown in Table 1 was mixed with water so that the moisture content was 13 wt %, and compression molded (press molded) under molding conditions of press temperatures of 60°C, 80°C, and 100°C (set thickness: 0.2 mm, press pressure: 4 tons, press time: 2 minutes fixed), and the transparency of each obtained molded product was evaluated.
なお、透明性の判定は、図１に示す判定基準に基づいて行った。この判定基準については、図１に示すように、下地の線や文字が良好に視認できる場合を〇、やや曇りはあるが下地の線や文字が視認できる場合を△、下地の線や文字の視認が困難な場合を×と表記した。 The transparency was judged based on the criteria shown in Figure 1. As shown in Figure 1, the criteria were as follows: ◯: the lines and letters on the background were clearly visible; △: the lines and letters on the background were visible, although there was some cloudiness; ×: it was difficult to see the lines and letters on the background.
本試験の結果を表２に示す。この表２に示すように、パルプ成分として、針葉樹パルプと広葉樹パルプの両方を用いた成形材料（本実施例１及び本実施例２）の場合、１００℃条件で良好な透明性を有する成形品が得られた。また、本実施例の成形材料においては、本実施例１（針葉樹パルプと広葉樹パルプの混合比を１：１にしたもの）は、プレス温度８０℃においてやや曇りはあるものの透明性を有する成形品が得られた。 The results of this test are shown in Table 2. As shown in Table 2, in the case of molding materials (Examples 1 and 2) that used both softwood pulp and hardwood pulp as the pulp components, molded articles with good transparency were obtained at 100°C. In addition, in the molding materials of this example, Example 1 (where the mixing ratio of softwood pulp and hardwood pulp was 1:1) produced molded articles that were slightly cloudy but had transparency at a press temperature of 80°C.
（２）成形時の設定肉厚による透明性評価試験
本試験では、表１に示す各成形材料を、水分含有量が１３ｗｔ％となるよう水を混合し、設定肉厚０．１ｍｍ、０．２ｍｍ、０．３ｍｍの成形条件（プレス温度：１００℃、プレス圧力：４トン、プレス時間：２分は固定）で圧縮成形（プレス成形）し、得られた各成形品の透明性を、成形時の温度（プレス温度）による透明性評価試験と同様、図１に示す判定基準に基づいて判定した。
(2) Transparency evaluation test based on thickness set during molding In this test, each molding material shown in Table 1 was mixed with water so that the moisture content was 13 wt %, and compression molded (press molded) under molding conditions with thicknesses of 0.1 mm, 0.2 mm, and 0.3 mm (press temperature: 100° C., press pressure: 4 tons, press time: fixed at 2 minutes). The transparency of each molded product obtained was judged based on the judgment criteria shown in FIG. 1, as in the transparency evaluation test based on temperature (press temperature) during molding.
本試験の結果を表３に示す。この表３に示すように、本評価試験においても、本実施例の成形材料を用いた成形品のみに良好な透明性が確認された。また、本実施例の成形材料において、本実施例１（針葉樹パルプと広葉樹パルプの混合比を１：１にしたもの）は全ての肉厚条件で良好な透明性が有する成形品が得られた。 The results of this test are shown in Table 3. As shown in Table 3, in this evaluation test, good transparency was confirmed only in the molded products using the molding material of this example. In addition, with regard to the molding material of this example, this example 1 (a 1:1 mixture of softwood pulp and hardwood pulp) produced molded products with good transparency under all thickness conditions.
（３）成形材料の水分含有率による透明性評価試験
本試験では、表１に示す各成形材料において、水分含有率を１０ｗｔ％、１２ｗｔ％、１３ｗｔ％とした成形材料を作成し、これらを設定肉厚：０．２ｍｍ、プレス温度：１００℃、プレス圧力：４トン、プレス時間：２分の成形条件で圧縮成形し、得られた各成形品の透明性を、成形時の温度（プレス温度）による透明性評価試験と同様、図１に示す判定基準に基づいて判定した。
(3) Transparency evaluation test according to moisture content of molding material In this test, molding materials with moisture contents of 10 wt%, 12 wt%, and 13 wt% were prepared for each molding material shown in Table 1, and these were compression molded under the molding conditions of set thickness: 0.2 mm, press temperature: 100°C, press pressure: 4 tons, and press time: 2 minutes. The transparency of each molded product obtained was judged based on the judgment criteria shown in Figure 1, as in the transparency evaluation test according to the temperature during molding (press temperature).
本試験の結果を表４に示す。この表４に示すように、本実施例の成形材料を用いた成形品のみに良好な透明性が確認された。また、本実施例の成形材料において、本実施例１（針葉樹パルプと広葉樹パルプの混合比を１：１にしたもの）は全ての水分率条件で良好な透明性を有する成形品が得られた。 The results of this test are shown in Table 4. As shown in Table 4, good transparency was confirmed only in the molded products using the molding material of this example. Furthermore, in the molding material of this example, Example 1 (a 1:1 mixture of softwood pulp and hardwood pulp) produced molded products with good transparency under all moisture content conditions.
＜光透過性評価試験＞
本試験では、本実施例の成形材料（混合率を、針葉樹パルプ：広葉樹パルプ：澱粉＝３０：３０：４０、水分含有量を１３ｗｔ％～１４ｗｔ％とした成形材料）を用い、表５に示すような、設定肉厚、プレス圧力及びプレス時間の成形条件を変更した１２つの成形品（Ｎｏ．１～Ｎｏ．１２）を作成し、各成形品の光透過性を測定し、成形条件差による光透過性（透明性）の変化について確認した。なお、成形条件において、プレス温度は１００℃に固定した。
<Light transmittance evaluation test>
In this test, the molding material of this example (a molding material with a mixing ratio of softwood pulp: hardwood pulp: starch = 30:30:40, and a moisture content of 13 wt% to 14 wt%) was used to create 12 molded products (No. 1 to No. 12) with different molding conditions of set wall thickness, press pressure, and press time, as shown in Table 5, and the light transmittance of each molded product was measured to confirm the change in light transmittance (transparency) due to the difference in molding conditions. Note that, among the molding conditions, the press temperature was fixed at 100°C.
本試験の結果を図２に示す。この図２に示すように、光透過率は成形条件における設定肉厚の依存性が高いことが確認され、設定肉厚が薄い方が光透過率が高くなる（透明性が向上する）結果が得られた。 The results of this test are shown in Figure 2. As shown in Figure 2, it was confirmed that the light transmittance is highly dependent on the set wall thickness in the molding conditions, and the thinner the set wall thickness, the higher the light transmittance (improved transparency).
また、本試験では透明性評価試験と同様、図１の判定基準に基づき、各成形品の透明性も判定した。その結果、Ｎｏ．１～Ｎｏ．１２の全てが判定〇となる良好な透明性を有する結果が得られた。 In this test, the transparency of each molded product was also judged based on the criteria in Figure 1, just like in the transparency evaluation test. As a result, all of No. 1 to No. 12 were judged to have good transparency, earning a rating of ◯.
以上から、混合パルプと澱粉系結合剤との混合比を６：４とすると共に、混合パルプにおける針葉樹パルプと広葉樹パルプとの混合比を１：１とし、且つ成形材料における水分率を１３ｗｔ％とすることが最も望ましい成形材料で、この成形材料を、プレス圧力：４トン、プレス温度１００℃、設定肉厚０．２ｍｍで圧縮成形することで、パルプ成形品が最も透明性を有するものとなる。 From the above, the most desirable molding material is one in which the mixing ratio of mixed pulp to starch-based binder is 6:4, the mixing ratio of softwood pulp to hardwood pulp in the mixed pulp is 1:1, and the moisture content of the molding material is 13 wt%. By compression molding this molding material with a press pressure of 4 tons, a press temperature of 100°C, and a set thickness of 0.2 mm, the pulp molded product will have the greatest transparency.
なお、本発明は、本実施例に限られるものではなく、各構成要件の具体的構成は適宜設計し得るものである。 The present invention is not limited to this embodiment, and the specific configuration of each component can be designed as appropriate.
Claims (2)
記
前記針葉樹パルプ、前記広葉樹パルプ、前記澱粉系結合剤及び前記水を混合した混合物における前記澱粉系結合剤の混合率を３０ｗｔ％～４０ｗｔ％、前記水の混合率を１０ｗｔ％～１５ｗｔ％とし、さらに、前記針葉樹パルプ及び前記広葉樹パルプの混合比（重量）を１：１～１：３とする。 A method for producing a molding material mainly composed of pulp and a starch-based binder, characterized in that softwood pulp, hardwood pulp, a starch-based binder and water are mixed and kneaded under the following conditions :
Notes
In a mixture of the softwood pulp, the hardwood pulp, the starch-based binder, and the water, the mixing ratio of the starch-based binder is 30 wt % to 40 wt %, the mixing ratio of the water is 10 wt % to 15 wt %, and further the mixing ratio (by weight) of the softwood pulp and the hardwood pulp is 1:1 to 1:3.
記
温度：６０℃～１００℃
混練速度：８０ｒｐｍ～１２０ｒｐｍ
混練時間：５分以上 2. The method for producing a molding material according to claim 1 , wherein the kneading is carried out under the following conditions:
Note Temperature: 60℃~100℃
Mixing speed: 80 rpm to 120 rpm
Mixing time: 5 minutes or more
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