JP2009119779A - Manufacturing method of rod-like molded article - Google Patents

Manufacturing method of rod-like molded article Download PDF

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JP2009119779A
JP2009119779A JP2007297947A JP2007297947A JP2009119779A JP 2009119779 A JP2009119779 A JP 2009119779A JP 2007297947 A JP2007297947 A JP 2007297947A JP 2007297947 A JP2007297947 A JP 2007297947A JP 2009119779 A JP2009119779 A JP 2009119779A
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rod
molded body
resin
shaped molded
manufacturing
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Takehiko Tanaka
武彦 田中
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Sanshin Kako Co Ltd
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Sanshin Kako Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a rod-like molded article such as a chopstick in which the jetting does not become a product defect, capable of manufacturing two-color rod-like molded article excellent in product strength. <P>SOLUTION: The manufacturing method of rod-like molded article comprises: a process of preliminarily molding a preliminary molded body composed of a part (A) having a predetermined thickness in the longitudinal direction and a part (B) having a thickness determined by subtracting a cross-section from the predetermined thickness; and a process of post-molding the part (B) of the obtained preliminary molded body so as to become a prescribed thickness. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、棒状成形体の製造方法に関する。さらに詳しくは、ジェッティングが製品の欠陥とならない樹脂製棒状体の製造方法に関する。   The present invention relates to a method for manufacturing a rod-shaped molded body. More specifically, the present invention relates to a method for manufacturing a resin rod-like body in which jetting does not become a product defect.

樹脂を用いて箸などの棒状成形体を製造する場合、射出成形により長手方向に樹脂を射出して製造されているが、このような製造方法では、製品にジェッティングと呼ばれる外観不良が生じやすく、そのために成形条件が制限されたり、製品の歩留りを低下させるので、生産性を上げることが困難であるという問題があった。   When manufacturing rod-shaped molded products such as chopsticks using resin, it is manufactured by injecting resin in the longitudinal direction by injection molding, but such a manufacturing method tends to cause appearance defects called jetting in products. For this reason, there are problems that the molding conditions are limited and the yield of the product is lowered, so that it is difficult to increase the productivity.

また、このような樹脂製棒状成形体を、多色製品とするのには、成形体の所定の部分を、表面処理し、続いて塗装を施した後、さらにクリア塗装するという三つの工程を経る必要があったので、製造に手間と時間がかかっていた上に、製品をリサイクルする際には塗料が異物となってリサイクルを妨げるという問題があった。   In addition, in order to make such a resin rod-shaped molded body into a multicolor product, a predetermined part of the molded body is subjected to surface treatment, followed by painting, followed by further clear coating. Since it was necessary to pass through, it took time and effort to manufacture, and when recycling the product, there was a problem that the paint became a foreign substance and prevented recycling.

二色棒状体の成形には、二色成形機による成形という手法があるが、この成形方法で二色棒状体の成形を製造した場合、色の異なる部分の継ぎ目が熱融着結合されるので、箸など部分的に力が掛かる製品では、その部分で折れ易いという問題があった。   There is a method of forming a two-color rod-shaped body by a two-color molding machine, but when a two-color rod-shaped body is manufactured by this molding method, the seams of different colors are bonded by heat fusion. There is a problem that a product such as chopsticks, which is partially applied with force, easily breaks.

本発明者は、従来の樹脂製棒状成形体の製造方法の問題点を解決しうる製造方法の開発に取り組んだ結果本発明に到達したものである。
本発明は、ジェッティングが製品の欠陥とならない箸などの棒状成形体の製造方法を提供する。
本発明は、また製品強度にすぐれた二色棒状成形体の製造が可能な、棒状成形体の製造方法を提供する。
The present inventor has reached the present invention as a result of working on the development of a manufacturing method capable of solving the problems of the conventional method for manufacturing a resin rod-shaped molded body.
The present invention provides a method of manufacturing a rod-shaped molded body such as chopsticks in which jetting does not cause a product defect.
The present invention also provides a method for producing a rod-shaped molded body capable of producing a two-color rod-shaped molded body having excellent product strength.

本発明は、樹脂製棒状成形体を成形するのに、予め長手方向に所定の太さを有する部分(A)と、所定の太さより断面積を減じた太さを有する部分(B)とからなる予備成形体を成形し、得られた予備成形体の該部分(B)を所定の太さとなるように後成形することを特徴とする樹脂製棒状成形体の製造方法を提供する。   The present invention comprises a part (A) having a predetermined thickness in the longitudinal direction in advance and a part (B) having a thickness obtained by subtracting the cross-sectional area from the predetermined thickness to form a resin rod-shaped molded body. There is provided a method for producing a resin rod-shaped molded body, wherein a preformed body is molded, and the portion (B) of the obtained preformed body is post-molded so as to have a predetermined thickness.

前記(B)の長さが、棒状成形体の全長の15〜50%である前記した樹脂製棒状成形体の製造方法は本発明の好ましい態様である。   The above-described method for producing a resin rod-shaped molded body, in which the length of (B) is 15 to 50% of the total length of the rod-shaped molded body, is a preferred embodiment of the present invention.

前記(B)の太さが、所定の太さに対して25〜65%である前記した樹脂製棒状成形体の製造方法は本発明の好ましい態様である。   The above-described method for producing a resin rod-shaped molded body in which the thickness of (B) is 25 to 65% with respect to a predetermined thickness is a preferred embodiment of the present invention.

前記後成形に用いる樹脂に顔料が配合されている前記した樹脂製棒状成形体の製造方法は本発明の好ましい態様である。   The above-described method for producing a resin rod-shaped molded article in which a pigment is blended with the resin used for the post-molding is a preferred embodiment of the present invention.

前記部分(B)の表面に突起を有しており、該突起が、突起の外側表面が前記後成形後の棒状成形体の表面となるように形成されている前記した樹脂製棒状成形体の製造方法は本発明の好ましい態様である。   The portion (B) has a protrusion on the surface, and the protrusion is formed such that the outer surface of the protrusion is the surface of the post-molded rod-shaped molded body. The production method is a preferred embodiment of the present invention.

前記樹脂製棒状成形体の成形が射出成形法によって行われ、予備成形体の成形を、部分(B)が射出口に近い位置で形成されるように行い、前記後成形が部分(B)側端より樹脂を射出することによって行われる前記した樹脂製棒状成形体の製造方法は本発明の好ましい態様である。   The resin rod-shaped molded body is molded by an injection molding method, the preform is molded so that the part (B) is formed at a position close to the injection port, and the post-molding is performed on the part (B) side. The above-described method for producing a resin rod-like molded body performed by injecting resin from the end is a preferred embodiment of the present invention.

棒状成形体が箸である前記した樹脂製棒状成形体の製造方法は本発明の好ましい態様である。   The above-described method for producing a resin rod-shaped molded body in which the rod-shaped molded body is chopsticks is a preferred embodiment of the present invention.

本発明により、ジェッティングが製品の欠陥とならない箸などの棒状成形体の製造方法が提供される。
本発明により、製品強度にすぐれた二色棒状成形体の製造が可能な、棒状成形体の製造方法が提供される。
本発明により、製品のリサイクルが障害なく実施可能な棒状成形体の製造方法が提供される。
According to the present invention, there is provided a method for manufacturing a rod-shaped molded body such as chopsticks in which jetting does not cause a product defect.
According to the present invention, there is provided a method for producing a rod-shaped molded body capable of producing a two-color rod-shaped molded body having excellent product strength.
According to the present invention, there is provided a method for manufacturing a rod-shaped molded body that can be recycled without any obstacle.

本発明は、樹脂製棒状成形体を成形するのに、予め長手方向に所定の太さを有する部分(A)と、所定の太さより断面積を減じた太さを有する部分(B)とからなる予備成形体を成形し、続いて該部分(B)を所定の太さとなるように後成形することを特徴とする樹脂製棒状成形体の製造方法を提供する。   The present invention comprises a part (A) having a predetermined thickness in the longitudinal direction in advance and a part (B) having a thickness obtained by subtracting the cross-sectional area from the predetermined thickness to form a resin rod-shaped molded body. There is provided a method for producing a resin rod-shaped molded body, characterized in that a preform is formed, and then the portion (B) is post-molded so as to have a predetermined thickness.

なお、本発明における棒状成形体とは、限定するわけではないが、主として直径が1cm程度までの箸状を含む棒状成形体をいう。棒状成形体の断面形状は特に制限はなく、円形でも、方形でも、多角形であってもよい。   In addition, although not necessarily limited, the rod-shaped molded body in the present invention mainly refers to a rod-shaped molded body including a chopstick shape having a diameter of about 1 cm. The cross-sectional shape of the rod-shaped molded body is not particularly limited, and may be circular, square, or polygonal.

所定の太さより断面積を減じた太さを有する部分(B)を有する予備成形体を成形し、続いて該部分(B)を所定の太さとなるように後成形することにより、得られる棒状成形体は、予備成形体を芯とする成形体であるので、強度的には十分な強度を有している。   A rod-like shape obtained by molding a preform having a portion (B) having a thickness obtained by subtracting a cross-sectional area from a predetermined thickness, and subsequently forming the portion (B) to a predetermined thickness. Since the molded body is a molded body having a preform as a core, the molded body has sufficient strength.

後成形に使用する樹脂に含量を配合することによって、(B)の部分の色を予備成形体と異なった色として、最終成形体を二色成形体とすることができるが、得られる二色棒状成形体は、(A)の部分と(B)の部分に継ぎ目はないので、その境界部分で折れ易いというような問題は生じない。   By blending the content in the resin used for post-molding, the color of the part (B) can be made different from the preform and the final molded body can be made into a two-color molded body. Since the rod-shaped molded body has no seam between the part (A) and the part (B), there is no problem that it is easily broken at the boundary part.

このような強度の特徴を発揮する観点から、前記部分(B)の太さが、所定の太さに対して断面積として25〜65%であることが好ましい。   From the viewpoint of exhibiting such strength characteristics, the thickness of the portion (B) is preferably 25 to 65% as a cross-sectional area with respect to a predetermined thickness.

図1は、本発明の予備成形体の例を示す概略図である。図1の予備成形体は、箸状の棒状成形体を製造するためのものである。図2は、図1の予備成形体について後成形して、得られた所定の棒状成形体を示す概略図である。図2には、棒状成形体の(B)部分の断面が示されている。断面図において、Dは予備成形体部分(B)の断面であり、CはDの位置で所定の太さをもった成形体の断面である。Dの断面積が、Cの断面積(Dも含む)の25〜65%であることが好ましい。   FIG. 1 is a schematic view showing an example of a preform according to the present invention. The preform shown in FIG. 1 is for producing a chopstick-like rod-like shaped body. FIG. 2 is a schematic view showing a predetermined rod-shaped body obtained by post-molding the preform of FIG. FIG. 2 shows a cross section of a portion (B) of the rod-shaped molded body. In the cross-sectional view, D is a cross section of the preformed body portion (B), and C is a cross section of the molded body having a predetermined thickness at the position of D. The cross sectional area of D is preferably 25 to 65% of the cross sectional area of C (including D).

このような二色成形棒状成形体に、通常使用されている二色成形機を使用することもできる。二色成形機を使用すると、予備成形体の成形とそれに続く後成形を1回の成形操作で完了することができる。   A normally used two-color molding machine can be used for such a two-color molded rod-shaped molded body. When a two-color molding machine is used, the preforming and subsequent post-molding can be completed in a single molding operation.

上記のような方法で製造された二色成形棒状成形体は、顔料の含有量も低いので、製造上の経済的効果だけでなく、製品をリサイクルする際にも顔料が障害となることはないためリサイクルし易いという効果もある。   The two-color molded rod-shaped molded body produced by the method as described above has a low pigment content, so that the pigment does not become an obstacle when recycling the product as well as the economic effect of production. Therefore, there is an effect that it is easy to recycle.

箸などの棒状成形体は、通常射出成形によって長手方向に樹脂を射出して行われるが、樹脂が射出される過程で、ジェッティングという外観不良が生じて、製品価値を下げるという問題があった。   Rod-shaped molded products such as chopsticks are usually produced by injecting resin in the longitudinal direction by injection molding. However, there is a problem in that the appearance of defective jetting occurs in the process of injecting resin and the product value is lowered. .

本発明の樹脂製棒状成形体の製造方法を射出成形法によって行うとき、予備成形体の成形を、部分(B)が射出口に近い位置で形成されるように行えば、ジェッティングは部分(B)では発生するが、部分(A)にまでは及びにくい。予備成形体を後成形する際には、部分(B)側端より樹脂を射出することによって、部分(B)を所定の太さとなるように成形する。このような後成形の形態では、樹脂の流れ方が影響していると推定されるが、ジェッティングは起こりにくい。結果として本発明の製造方法で得られた棒状成形体には、ジェッティングによる外観不良は認められないのである。   When the method for producing the resin rod-shaped molded body of the present invention is performed by injection molding, if the preform is molded so that the portion (B) is formed at a position close to the injection port, Although it occurs in B), it is difficult to reach part (A). When post-molding the preform, the part (B) is molded to a predetermined thickness by injecting a resin from the side end of the part (B). In such a post-molding form, it is presumed that the flow of the resin is affected, but jetting hardly occurs. As a result, the appearance defect due to jetting is not recognized in the rod-shaped molded body obtained by the production method of the present invention.

したがって、樹脂製棒状成形体の成形が射出成形法によって行われ、予備成形体の成形を、部分(B)が射出口に近い位置で形成されるように行い、前記後成形を部分(B)側端より樹脂を射出することによって行われる樹脂製棒状成形体の製造方法は本発明の好ましい態様である。   Therefore, the resin rod-shaped molded body is molded by the injection molding method, the preformed body is molded so that the part (B) is formed at a position close to the injection port, and the post-molding is performed on the part (B). The manufacturing method of the resin rod-shaped molded body performed by injecting the resin from the side end is a preferred embodiment of the present invention.

この際、予備成形体の部分(B)の射出口に近い端部の位置が、後成形部分の射出口に近い端部より1mm以上、好ましくは1mm〜4mm程度後退していることが好ましい。この様子を、図5に示すが、予備成形体の部分(B)5が、後成形部分の端部6からcの距離後退していることが好ましく、cが1mm以上であることが好ましい。cが1mm以上であると、ジェッティングはより起こりにくくなるので、ジェッティングによる外観不良が認められない棒状成形体をより容易に得ることができるのである。   At this time, the position of the end portion near the injection port of the part (B) of the preformed body is preferably set back by 1 mm or more, preferably about 1 mm to 4 mm, from the end portion near the injection port of the rear molding portion. This state is shown in FIG. 5, and it is preferable that the part (B) 5 of the preform is set back by a distance c from the end 6 of the post-molded part, and c is preferably 1 mm or more. When c is 1 mm or more, jetting is less likely to occur, so that a rod-like molded body in which no appearance defect due to jetting is recognized can be obtained more easily.

前記部分(B)の長さが、棒状成形体の全長の20〜40%の範囲にあれば、部分(B)で発生したジェッティングは、部分(A)にまでは及ばないので、部分(B)の長さこの範囲にあることが好ましい。部分(B)の長さは、図1におけるaの長さである。   If the length of the part (B) is in the range of 20 to 40% of the total length of the rod-shaped molded body, the jetting generated in the part (B) does not reach the part (A). The length of B) is preferably in this range. The length of the portion (B) is the length a in FIG.

また、後成形でジェッティングは起こりにくいという観点からも、前記部分(B)の太さが、所定の太さに対して25〜65%であることが好ましい。   Moreover, it is preferable that the thickness of the said part (B) is 25 to 65% with respect to predetermined | prescribed thickness also from a viewpoint that jetting does not occur easily by post-molding.

本発明の製造方法によれば、ジェッティングが製品の欠陥とならない箸などの棒状成形体を得ることができる。   According to the manufacturing method of the present invention, it is possible to obtain a rod-shaped molded body such as chopsticks in which jetting does not cause a product defect.

本発明の製造方法によれば、ジェッティングが製品の欠陥とならないため、成形条件上の制約が少ないので、生産性の高い条件を選択することが可能となる。また、一度に多数の成形体を製造するいわゆる多数個取りも容易となるので、成形体を高い生産性で製造することができる。   According to the manufacturing method of the present invention, since jetting does not become a product defect, there are few restrictions on molding conditions, so it is possible to select conditions with high productivity. In addition, since it is easy to obtain a large number of molded products at a time, it is possible to manufacture the molded product with high productivity.

本発明の樹脂製棒状成形体の製造方法の一態様として、予備成形体の部分(B)に突起を形成させる方法がある。突起の高さを、突起の外側表面が後成形後の棒状成形体の表面となるように設定すると、得られる樹脂製棒状成形体の表面に突起の外側表面の形状が模様として現れるので、樹脂製棒状成形体に模様付けをして装飾性を高めることができる。   As one aspect of the method for producing the resin rod-shaped molded body of the present invention, there is a method of forming protrusions on the portion (B) of the preformed body. If the height of the protrusion is set so that the outer surface of the protrusion becomes the surface of the post-molded rod-shaped molded body, the shape of the outer surface of the protrusion appears as a pattern on the surface of the obtained resin rod-shaped molded body. The decorativeness can be enhanced by patterning the rod-shaped molded body.

樹脂製棒状成形体を前記した二色成形体とするとき、このような突起による模様は、後成形の樹脂の色とは異なった予備成形体の色で現れるので、目立った外観模様として認められる。   When the resin rod-shaped molded body is a two-color molded body as described above, such a pattern due to the protrusion appears in a color of a preformed body different from the color of the resin molded later, so that it is recognized as a conspicuous appearance pattern. .

部分(B)に設ける突起の数は、特に制限はないが複数ある方が外観模様としての効果が高いので好ましい。また、突起の外表面の形状には特に制限はなく、任意の形状をとり得る。   The number of protrusions provided on the portion (B) is not particularly limited, but a plurality of protrusions is preferable because the effect as an appearance pattern is high. Moreover, there is no restriction | limiting in particular in the shape of the outer surface of protrusion, Arbitrary shapes can be taken.

図3は、予備成形体の部分(B)に突起を形成されている様子を示す概略図である。突起の高さは、突起の外側表面が後成形後の棒状成形体の表面となるように設定されている。図4には、突起の外側表面の形状が模様として現れている様子を示す概略図が示されている。   FIG. 3 is a schematic view showing a state in which protrusions are formed on the portion (B) of the preform. The height of the protrusion is set so that the outer surface of the protrusion becomes the surface of the post-molded rod-shaped body. FIG. 4 is a schematic diagram showing a state in which the shape of the outer surface of the protrusion appears as a pattern.

本発明の樹脂の種類には特に制限はなく、射出成形可能な熱可塑性樹脂であれば制限なく使用することができる。たとえば、ポリエステル系樹脂、ポリオレフィン系樹脂などを挙げることができる。本発明は、リサイクルポリエステルを用いる棒状成形体の製造にその効果を発揮するので、リサイクルポリエステルは本発明に使用する樹脂として好ましいものである。
特に本発明は、リサイクルポリエステル系樹脂を用いる箸の製造に適した方法である。
There is no restriction | limiting in particular in the kind of resin of this invention, If it is a thermoplastic resin which can be injection-molded, it can be used without a restriction | limiting. For example, a polyester resin, a polyolefin resin, etc. can be mentioned. Since this invention exhibits the effect in manufacture of the rod-shaped molded object using recycled polyester, recycled polyester is a preferable thing as resin used for this invention.
In particular, the present invention is a method suitable for manufacturing chopsticks using recycled polyester resin.

本発明によって製造された二色の樹脂製箸は、短時間に製造することがき、衝撃などによって色が剥離することはなく、ジェッティングによる外観不良もなく、また模様付けも容易にできるというすぐれた特徴がある。   The two-color resin chopsticks manufactured according to the present invention can be manufactured in a short time, the color does not peel off due to impact, etc., there is no appearance defect due to jetting, and the patterning can be easily performed. There are special features.

本発明の製造方法で得られる樹脂製箸にはジェッティングによる影響はないので、必要に応じて塗装を施してもよい、本発明の樹脂製箸においては容易には剥離しない良好な塗装が得られる。   Since the resin chopsticks obtained by the production method of the present invention are not affected by jetting, the resin chopsticks of the present invention may be coated as necessary. It is done.

また、本発明の製造方法で得られる樹脂製箸において、(B)部分の太さを、(A)部分より太い形状として、箸としての使用上の要請に応えることもできる。   Further, in the resin chopsticks obtained by the manufacturing method of the present invention, the thickness of the (B) portion can be made thicker than that of the (A) portion to meet the demand for use as a chopstick.

本発明により、ジェッティングが製品の欠陥とならない棒状成形体の製造方法が提供されるので、箸などの棒状成形体の生産性を上げ、歩留りの高い製造を可能となる。
本発明の棒状成形体の製造方法により、製品強度にすぐれた二色棒状成形体の製造が可能となる。
本発明の棒状成形体の製造方法により、成形によって製品に種々の模様を付けることができるので、製品の価値を高めることが可能となる。
本発明により提供される製造方法によって製造された棒状成形体は、製品のリサイクルが障害なく実施可能である。
本発明の棒状成形体の製造方法は特に箸の製造に好適に使用することができる。
According to the present invention, a method of manufacturing a rod-shaped molded body in which jetting does not become a product defect is provided, so that the productivity of a rod-shaped molded body such as chopsticks can be increased, and manufacturing with a high yield becomes possible.
According to the method for manufacturing a rod-shaped molded body of the present invention, a two-color rod-shaped molded body having excellent product strength can be manufactured.
With the method for manufacturing a rod-shaped molded body of the present invention, it is possible to give various patterns to a product by molding, so that the value of the product can be increased.
The rod-shaped molded body manufactured by the manufacturing method provided by the present invention can be recycled without any obstacle.
The method for producing a rod-shaped molded body of the present invention can be suitably used particularly for the production of chopsticks.

本発明の予備成形体を示す概略図である。It is the schematic which shows the preforming body of this invention. 本発明で得られた棒状成形体を示す概略図である。It is the schematic which shows the rod-shaped molded object obtained by this invention. 部分(B)に突起を有する予備成形体を示す概略図である。It is the schematic which shows the preforming body which has a processus | protrusion in a part (B). 突起の外側表面の形状が模様として現れている様子を示す概略図である。It is the schematic which shows a mode that the shape of the outer surface of a protrusion has appeared as a pattern. 本発明で得られた棒状成形体で、予備成形体の部分(B)の射出口に近い端部の位置が、後成形部分の射出口に近い端部より後退している態様を示す概略図である。Schematic showing a mode in which the position of the end portion near the injection port of the portion (B) of the preformed body is retreated from the end portion near the injection port of the rear molding portion in the rod-shaped molded body obtained in the present invention. It is.

符号の説明Explanation of symbols

1.予備成形体
2.棒状成形体
3.後成形部分
4.突起
5.予備成形体の部分(B)の端部
6.後成形部分の端部
(A).予備成形体の部分(A)
(B).予備成形体の部分(B)
(C).(D)の箇所の後成形体後の断面
(D).部分(B)の一部の断面
1. 1. Pre-formed body 2. Rod-shaped molded body 3. Post-molded part 4. Projection 5. End part (B) of the preform 6 End of post-molded part (A). Part of preform (A)
(B). Part of preform (B)
(C). (D) Cross section after post-molded body of (D). Partial cross section of part (B)

Claims (8)

樹脂製棒状成形体を成形するのに、予め長手方向に所定の太さを有する部分(A)と、所定の太さより断面積を減じた太さを有する部分(B)とからなる予備成形体を成形し、得られた予備成形体の該部分(B)を所定の太さとなるように後成形することを特徴とする樹脂製棒状成形体の製造方法。   In order to mold a resin rod-shaped molded body, a preformed body comprising a part (A) having a predetermined thickness in the longitudinal direction in advance and a part (B) having a thickness obtained by subtracting the cross-sectional area from the predetermined thickness A method for producing a resin rod-shaped molded body, wherein the part (B) of the obtained preform is post-molded so as to have a predetermined thickness. 前記(B)の長さが、棒状成形体の全長の15〜50%であることを特徴とする請求項1に記載の樹脂製棒状成形体の製造方法。   The length of said (B) is 15 to 50% of the full length of a rod-shaped molded object, The manufacturing method of the resin-made rod-shaped molded object of Claim 1 characterized by the above-mentioned. 前記(B)の太さが、所定の太さに対して25〜65%であることを特徴とする請求項1または2に記載の樹脂製棒状成形体の製造方法。   The method for producing a resin rod-shaped molded body according to claim 1 or 2, wherein the thickness of (B) is 25 to 65% with respect to a predetermined thickness. 前記後成形に用いる樹脂に、顔料が配合されていることを特徴とする請求項1〜3のいずれかに記載の樹脂製棒状成形体の製造方法。   The method for producing a resin rod-shaped molded body according to any one of claims 1 to 3, wherein a pigment is blended in the resin used for the post-molding. 前記部分(B)の表面に突起を有しており、該突起が、突起の外側表面が前記後成形後の棒状成形体の表面となるように形成されていることを特徴とする請求項1〜4のいずれかに記載の樹脂製棒状成形体の製造方法。   The surface of the part (B) has a protrusion, and the protrusion is formed so that the outer surface of the protrusion is the surface of the post-molded rod-shaped body. The manufacturing method of the resin-made rod-shaped molded object in any one of -4. 前記樹脂製棒状成形体の成形が射出成形法によって行われ、予備成形体の成形を、部分(B)が射出口に近い位置で形成されるように行い、前記後成形を部分(B)側端より樹脂を射出することによって行われることを特徴とする請求項1〜5のいずれかに記載の樹脂製棒状成形体の製造方法。   The resin rod-shaped molded body is molded by an injection molding method, the preformed body is molded so that the part (B) is formed at a position close to the injection port, and the post-molding is performed on the part (B) side. The method for producing a resin rod-shaped molded body according to any one of claims 1 to 5, wherein the method is performed by injecting a resin from an end. 予備成形体の部分(B)の端部が、後成形部分の端部より後退しており、その後退距離が1mm以上であることを特徴とする請求項1〜6のいずれかに記載の樹脂製棒状成形体の製造方法。   Resin according to any one of claims 1 to 6, characterized in that the end of the part (B) of the preform is set back from the end of the post-formed part, and the retreat distance is 1 mm or more. A method for producing a rod-shaped molded body. 棒状成形体が箸であることを特徴とする請求項1〜7のいずれかに記載の樹脂製棒状成形体の製造方法。   The method for producing a resin rod-shaped molded body according to any one of claims 1 to 7, wherein the rod-shaped molded body is chopsticks.
JP2007297947A 2007-11-16 2007-11-16 Manufacturing method of rod-like molded article Pending JP2009119779A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106079327A (en) * 2016-07-08 2016-11-09 苏州森勇华精密模具有限公司 A kind of chopsticks injection fixed mold with water route
CN106079270A (en) * 2016-07-08 2016-11-09 苏州森勇华精密模具有限公司 A kind of mold cores for throwaway chopsticks injection molding
CN106079326A (en) * 2016-07-08 2016-11-09 苏州森勇华精密模具有限公司 A kind of water route docking structure on chopsticks injection mold
CN106079271A (en) * 2016-07-08 2016-11-09 苏州森勇华精密模具有限公司 A kind of chopsticks injection fixed mold with location

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002361677A (en) * 2001-06-08 2002-12-18 Pigeon Corp Manufacturing method of rod-shaped molded body

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002361677A (en) * 2001-06-08 2002-12-18 Pigeon Corp Manufacturing method of rod-shaped molded body

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106079327A (en) * 2016-07-08 2016-11-09 苏州森勇华精密模具有限公司 A kind of chopsticks injection fixed mold with water route
CN106079270A (en) * 2016-07-08 2016-11-09 苏州森勇华精密模具有限公司 A kind of mold cores for throwaway chopsticks injection molding
CN106079326A (en) * 2016-07-08 2016-11-09 苏州森勇华精密模具有限公司 A kind of water route docking structure on chopsticks injection mold
CN106079271A (en) * 2016-07-08 2016-11-09 苏州森勇华精密模具有限公司 A kind of chopsticks injection fixed mold with location
CN106079326B (en) * 2016-07-08 2018-10-19 苏州森勇华精密模具有限公司 A kind of water route docking structure on chopsticks injection mold
CN106079327B (en) * 2016-07-08 2018-10-19 苏州森勇华精密模具有限公司 A kind of chopsticks injection molding fixed mold with water route

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