JP2016141080A - Production method of paper container - Google Patents

Production method of paper container Download PDF

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JP2016141080A
JP2016141080A JP2015019732A JP2015019732A JP2016141080A JP 2016141080 A JP2016141080 A JP 2016141080A JP 2015019732 A JP2015019732 A JP 2015019732A JP 2015019732 A JP2015019732 A JP 2015019732A JP 2016141080 A JP2016141080 A JP 2016141080A
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paper
container
blank
density
molding
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JP6204931B2 (en
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康弘 大原
Yasuhiro Ohara
康弘 大原
恵司 金指
Keiji Kanezashi
恵司 金指
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AIPATSUKUSU IKETANI KK
KURAMAE SANGYO KK
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AIPATSUKUSU IKETANI KK
KURAMAE SANGYO KK
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Abstract

PROBLEM TO BE SOLVED: To reduce molding wrinkles on a paper container, and improve intensity and rigidity over whole body of the paper container.SOLUTION: A paper blank P is formed of a single plate of low density paper whose density is 0.50 g/mto 0.75 g/m, or a laminated plate formed by laminating pieces of the low density paper, and a clearance C of a pair of molds 20 during restriction molding, is set to become smaller than a paper thickness t of the paper blank P.SELECTED DRAWING: Figure 4

Description

本発明は紙製容器の製造方法に関する。   The present invention relates to a method for manufacturing a paper container.

従来、紙製容器の製造方法として、特許文献１等に記載のものがある。
特許文献１に記載の紙製容器の製造方法は、坪量が１００〜５００g/m2、密度が０．５０〜０．７０g/cm3である３層以上の多層抄き板紙で、中層に機械パルプを主体とする層を、両外層に化学パルプを主体とする層を有し、該板紙の全パルプ量のうち３０重量％以上が機械パルプからなるプレス成形用紙を加熱成形し、紙の破損を生じずに深絞り容器を製造可能にするものである。 Conventionally, as a method for manufacturing a paper container, there is one described in Patent Document 1 or the like.
The method for producing a paper container described in Patent Document 1 is a multilayer paperboard of three or more layers having a basis weight of 100 to 500 g / m 2 and a density of 0.50 to 0.70 g / cm 3. A layer mainly composed of mechanical pulp, a layer mainly composed of chemical pulp in both outer layers, and 30% by weight or more of the total pulp amount of the paperboard is formed by thermoforming a press-molded paper. A deep-drawn container can be manufactured without causing damage.

特許3997713号公報Japanese Patent No. 3997713

特許文献１に記載の紙製容器の製造方法は、３層以上の多層抄き板紙を用意する必要があり、生産性が悪い。   The method for producing a paper container described in Patent Document 1 requires preparation of a multilayer paperboard having three or more layers, and the productivity is poor.

また、特許文献１に記載の紙製容器の製造方法は、成形された容器が歪みの大きな曲面部を有する場合、この曲面における成形しわの軽減に限界がある。また、深絞りの深さが大きくなるにつれ、容器の全体に渡る強度、剛性が低下し、胴膨れや底膨れの発生を抑制することに困難がある。   Further, the method for manufacturing a paper container described in Patent Document 1 has a limit in reducing wrinkles on the curved surface when the molded container has a curved surface portion with a large distortion. Further, as the depth of deep drawing increases, the strength and rigidity of the entire container are lowered, and it is difficult to suppress the occurrence of body swelling and bottom swelling.

本発明の課題は、紙製容器の成形しわを軽減させるとともに、容器の全体に渡る強度、剛性を向上することにある。   The subject of this invention is improving the intensity | strength and rigidity over the whole container while reducing the forming wrinkle of a paper container.

請求項１に係る発明は、紙製ブランクを一対の金型で絞り成形して紙製容器を製造する紙製容器の製造方法において、紙製ブランクが、密度０．５０g/m3〜０．７５g/m3の低密度紙の一枚板、又は該低密度紙を複数枚重ねたものから形成され、一対の金型の絞り成形時のクリアランスが紙製ブランクの紙厚より小さく設定されるようにしたものである。 The invention according to claim 1 is a paper container manufacturing method in which a paper blank is manufactured by drawing a paper blank with a pair of molds, and the paper blank has a density of 0.50 g / m 3 to 0.00. It is formed from a sheet of 75 g / m 3 low density paper or a stack of a plurality of low density papers, and the clearance at the time of drawing the pair of molds is set smaller than the paper thickness of the paper blank. It is what I did.

請求項２に係る発明は、請求項１に係る発明において更に、前記紙製ブランクを形成する低密度紙の坪量が２００g/m2〜７００g/m2であるようにしたものである。 The invention according to claim 2, further in the invention according to claim 1, the basis weight of the low density paper forming the paper-made blank is obtained as is 200g / m 2 ~700g / m 2 .

請求項３に係る発明は、請求項１又は２に係る発明において更に、前記絞り成形の成形温度を１００℃以上とするようにしたものである。   The invention according to claim 3 is the invention according to claim 1 or 2, wherein the forming temperature of the drawing is set to 100 ° C. or more.

請求項４に係る発明は、請求項１〜３のいずれかに係る発明において更に、前記紙製容器の絞り深さを２０mm以上とするようにしたものである。   The invention according to a fourth aspect is the invention according to any one of the first to third aspects, wherein the squeezing depth of the paper container is 20 mm or more.

（請求項１）
(a)低密度紙からなる紙製ブランクを、その紙厚より小さいクリアランスを備えた一対の金型（雌型と雄型）で絞り成形することにより、成形しわを軽減できる。容器の歪みの大きな曲面部でも、成形しわを目立たない程度に軽減できるし、その成形しわをかえって風合いとして活かす程度に生成できる。 (Claim 1)
(a) By forming a paper blank made of low density paper with a pair of molds (female mold and male mold) having a clearance smaller than the paper thickness, molding wrinkles can be reduced. Even in a curved portion having a large distortion of the container, the forming wrinkles can be reduced to an inconspicuous level, and the forming wrinkles can be generated to the extent that they can be used as a texture.

(b)低密度紙からなる紙製ブランクを、その紙厚より小さいクリアランスを備えた一対の金型（雌型と雄型）で絞り成形することにより、ふんわりした紙をプレス成形して硬くしめ、容器の全体に渡る強度、剛性を向上できる。容器の胴膨れや底膨れの発生を抑制できる。   (b) A paper blank made of low-density paper is drawn with a pair of dies (female and male) with a clearance smaller than the thickness of the paper, and the soft paper is press-molded and hardened. The strength and rigidity of the entire container can be improved. It is possible to suppress the occurrence of swelling and bottom swelling of the container.

(c)密度が０．５０g/m3未満だと容器に十分な強度、剛性を発現できない。密度が０．７５g/m3をこえると成形しわを十分に軽減できない。 (c) If the density is less than 0.50 g / m 3 , the container cannot exhibit sufficient strength and rigidity. If the density exceeds 0.75 g / m 3 , molding wrinkles cannot be sufficiently reduced.

ここで、紙製ブランクは、密度０．５０g/m3〜０．７５g/m3の低密度紙の一枚板、又は該低密度紙を複数枚重ねたものから形成される。複数枚の低密度紙を重ねて形成された紙製ブランクにあっては、複数枚の低密度紙の各個の厚みの合計値が当該紙製ブランクの紙厚になる。 Here, paper blanks, low density sheet single plate of a density of 0.50g / m 3 ~0.75g / m 3 , or formed a low density paper from those stacked plurality. In a paper blank formed by stacking a plurality of low density papers, the total thickness of each of the plurality of low density papers becomes the paper thickness of the paper blank.

（請求項２）
(d)紙製ブランクを形成する低密度紙の坪量が２００g/m2〜７００g/m2であるものとする。坪量２００g/m2〜７００g/m2は、一般的な板紙の範囲内である。 (Claim 2)
(d) basis weight of the low density paper is assumed to be 200g / m 2 ~700g / m 2 to form a paper blank. Basis weight 200g / m 2 ~700g / m 2 is in the range of typical paperboard.

坪量２００g/m2の紙の場合、密度０．５０g/m3〜０．７５g/m3で紙厚は０．４０mm〜０．２７mmとなり、上述(a)〜(c)を実現できる。 For the paper basis weight 200 g / m 2, a density 0.50g / m 3 ~0.75g / m 3 paper thickness 0.40mm~0.27mm becomes possible to realize the above mentioned (a) ~ (c).

坪量７００g/m2の紙の場合、密度０．５０g/m3〜０．７５g/m3で紙厚は１．４０mm〜０．９３mmとなり、上述(a)〜(c)を実現できる。 For the paper basis weight 700 g / m 2, a density 0.50g / m 3 ~0.75g / m 3 paper thickness 1.40mm~0.93mm becomes possible to realize the above mentioned (a) ~ (c).

（請求項３）
(e)絞り成形の成形温度を１００℃以上とする。
１００℃以上とすることにより、紙製ブランクが加熱されて軟化状態となり、成形容易になるとともに、プレス成形前の形状に戻ることがなくなって、プレス成形された容器の保形性に優れる。１００℃未満だと、成形された容器の保形成が悪く、それらの容器の積層保管性（各容器を互いに嵌合させて積み上げる）が悪くなり、積層作業に多くの時間を要し、生産性が落ちる。 (Claim 3)
(e) The molding temperature of drawing is set to 100 ° C. or higher.
By setting the temperature to 100 ° C. or higher, the paper blank is heated to be in a softened state, and it becomes easy to form, and it does not return to the shape before press forming, and the shape of the press-formed container is excellent. If the temperature is lower than 100 ° C, the formed containers are poorly formed, the storage stability of the containers (the containers are put together and stacked) is deteriorated, and the stacking work takes a lot of time, and the productivity is increased. Falls.

（請求項４）
(f)絞り深さ２０mm以上の深絞り容器でも、上述(a)〜(e)を確保できる。 (Claim 4)
(f) The above-described (a) to (e) can be secured even in a deep-drawn container having a drawn depth of 20 mm or more.

図１は紙製容器を示す断面図である。FIG. 1 is a cross-sectional view showing a paper container. 図２は紙製容器の容器本体と蓋を分離して示す斜視図である。FIG. 2 is a perspective view showing the container body and the lid of the paper container separately. 図３は紙製容器に生じた成形しわを示す模式図である。FIG. 3 is a schematic diagram showing molding wrinkles generated in a paper container. 図４は金型による紙製容器の成形状態を示す模式図である。FIG. 4 is a schematic view showing a molding state of a paper container using a mold.

図１、図２に示した本発明の一実施例に係るまゆ玉型の紙製容器１０は、容器本体１１と蓋１２とからなり、容器本体１１の開口まわりの外周部に蓋１２を着脱可能にしたものである。容器１０（容器本体１１及び蓋１２）はまゆ玉型に限らず、立方体、直方体等のいかなる形態であっても良い。容器１０は菓子類、弁当、食肉、鮮魚等の食品類の他、文房具類等、いかなる物品の包装にも利用できる。   The eyebrow-shaped paper container 10 according to one embodiment of the present invention shown in FIGS. 1 and 2 includes a container body 11 and a lid 12, and the lid 12 is attached to and detached from the outer periphery around the opening of the container body 11. It is possible. The container 10 (container body 11 and lid 12) is not limited to the eyebrow shape, but may be any form such as a cube or a rectangular parallelepiped. The container 10 can be used for packaging any article such as confectionery, lunch, meat, fresh fish, and stationery.

容器１０の容器本体１１（蓋１２も同じ）は、図４に示す如く、紙製ブランクＰを一対の金型２０（雌型２１と雄型２２）で絞り成形（プレス成形）して製造される。本実施例では、容器１０の絞り深さ（容器本体１１の絞り深さｄ1又は蓋１２の絞り深さｄ2）（図１）を２０mm以上とするものである。   As shown in FIG. 4, the container body 11 of the container 10 (same for the lid 12) is manufactured by drawing (pressing) a paper blank P with a pair of molds 20 (a female mold 21 and a male mold 22). The In this embodiment, the drawing depth of the container 10 (the drawing depth d1 of the container body 11 or the drawing depth d2 of the lid 12) (FIG. 1) is set to 20 mm or more.

一対の金型２０による容器本体１１（又は蓋１２）の絞り成形は、以下の条件によりなされる。   Drawing of the container body 11 (or the lid 12) by the pair of molds 20 is performed under the following conditions.

（条件１）
紙製ブランクＰが密度０．５０g/m3〜０．７５g/m3の低密度紙から形成されるものとする。また、一対の金型２０の絞り成形時のクリアランス（雌型２１と雄型２２の隙間Ｃ）を、紙製ブランクＰの紙厚ｔより小さく設定される（Ｃ＜ｔ）（図４）。 (Condition 1)
Paper blank P is assumed to be formed from a low density paper density 0.50g / m 3 ~0.75g / m 3 . Further, the clearance (the gap C between the female mold 21 and the male mold 22) at the time of drawing the pair of molds 20 is set smaller than the paper thickness t of the paper blank P (C <t) (FIG. 4).

条件１によって、低密度紙からなる紙製ブランクＰがその紙厚より小さなクリアランスを備えた一対の金型２０（雌型２１、雄型２２）で絞り成形されることから、成形された紙製容器１０（容器本体１１、蓋１２）の各部の板厚は紙製ブランクＰの紙厚より小さなものになる。   According to condition 1, a paper blank P made of low-density paper is drawn by a pair of molds 20 (female mold 21 and male mold 22) having a clearance smaller than the paper thickness. The plate thickness of each part of the container 10 (container body 11, lid 12) is smaller than the paper thickness of the paper blank P.

上述の条件１により、下記(a)〜(c)の作用効果を奏する。
(a)プレス成形された紙製容器１０（容器本体１１と蓋１２）に生じる成形しわを軽減できる。図３（Ａ）は本発明方法により製造された蓋１２の成形しわを示し、図３（Ｂ）は従来方法により製造された蓋１２の成形しわを示しており、本発明方向によって成形しわを軽減できることが認められる（容器本体１１の成形しわも実質的に同様になる）。容器１０の歪みの大きな曲面部でも、成形しわを目立たない程度に軽減できるし、その成形しわをかえって風合いとして活かす程度に生成できる。 Under the above condition 1, the following effects (a) to (c) are obtained.
(a) Molding wrinkles generated in the press-molded paper container 10 (container body 11 and lid 12) can be reduced. FIG. 3A shows the molding wrinkle of the lid 12 manufactured by the method of the present invention, and FIG. 3B shows the molding wrinkle of the lid 12 manufactured by the conventional method. It can be seen that it can be reduced (the molding wrinkles of the container body 11 are substantially the same). Even a curved surface portion having a large distortion of the container 10 can be reduced to such an extent that the forming wrinkles are not noticeable, and can be generated to the extent that the forming wrinkles can be used as a texture.

(b)ふんわりした紙をプレス成形して硬くしめ、容器１０の全体に渡る強度、剛性を向上できる。容器１０の胴膨れや底膨れの発生を抑制できる。   (b) The soft paper can be press-molded and hardened to improve the strength and rigidity of the entire container 10. Generation | occurrence | production of the swelling of the container 10 and a bottom swelling can be suppressed.

(c)密度が０．５０g/m3未満だと容器１０に十分な強度、剛性を発現できない。密度が０．７５g/m3をこえると成形しわを十分に軽減できない。 (c) If the density is less than 0.50 g / m 3 , the container 10 cannot exhibit sufficient strength and rigidity. If the density exceeds 0.75 g / m 3 , molding wrinkles cannot be sufficiently reduced.

ここで、紙製ブランクＰは、密度０．５０g/m3〜０．７５g/m3の低密度紙の一枚板、又は該低密度紙を複数枚重ねたものから形成される。複数枚の低密度紙を重ねて形成された紙製ブランクＰにあっては、複数枚の低密度紙の各個の厚みの合計値が当該紙製ブランクＰの紙厚Ｔになる。 Here, paper blank P is low density paper single plate of a density of 0.50g / m 3 ~0.75g / m 3 , or formed a low density paper from those stacked plurality. In the paper blank P formed by stacking a plurality of low density papers, the total thickness of each of the plurality of low density papers becomes the paper thickness T of the paper blank P.

（条件２）
条件１の紙製ブランクＰを形成する低密度紙として坪量が２００g/m2〜７００g/m2のものを採用する。坪量２００g/m2〜７００g/m2は、一般的な板紙の範囲内である。尚、「密度＝坪量÷紙厚」である。 (Condition 2)
The basis weight is adopted as the 200g / m 2 ~700g / m 2 as a low density paper forming the paper blank P in condition 1. Basis weight 200g / m 2 ~700g / m 2 is in the range of typical paperboard. Incidentally, “density = basis weight ÷ paper thickness”.

上述の条件２により、下記(d)の作用効果を奏する。
(d)坪量２００g/m2の紙の場合、密度０．５０g/m3〜０．７５g/m3で紙厚は０．４０mm〜０．２７mmとなり、上述(a)〜(c)を実現できる。 According to the above condition 2, the following effect (d) is obtained.
(d) a basis weight of 200 g / m 2 when paper, a density 0.50g / m 3 ~0.75g / m 3 paper thickness 0.40mm~0.27mm, and the above-described (a) ~ (c) realizable.

坪量７００g/m2の紙の場合、密度０．５０g/m3〜０．７５g/m3で紙厚は１．４０mm〜０．９３mmとなり、上述(a)〜(c)を実現できる。 For the paper basis weight 700 g / m 2, a density 0.50g / m 3 ~0.75g / m 3 paper thickness 1.40mm~0.93mm becomes possible to realize the above mentioned (a) ~ (c).

（条件３）
条件１、２による紙製ブランクＰの絞り成形時に、成形温度を１００℃以上とする。この成形温度は、加熱された金型２０（雌型２１と雄型２２）において紙製ブランクＰが接触する型表面の実測温度であり、紙製ブランクＰを加熱しつつプレス成形するものである。 (Condition 3)
When drawing the paper blank P according to the conditions 1 and 2, the molding temperature is set to 100 ° C. or higher. This molding temperature is an actually measured temperature of the mold surface where the paper blank P is in contact with the heated mold 20 (female mold 21 and male mold 22), and press molding while heating the paper blank P. .

上述の条件３により、下記(e)の作用効果を奏する。
(e)１００℃以上とすることにより、紙製ブランクＰが加熱されて軟化状態となり、成形容易になるとともに、プレス成形前の形状に戻ることがなくなって、プレス成形後の保形性に優れる。１００℃未満だと、成形に時間がかかって生産性が落ちるし、成形された容器の保形性が悪くなるために積層保管作業性が悪くなって生産性が落ちる。 According to the above condition 3, the following effect (e) is obtained.
(e) By setting the temperature to 100 ° C. or higher, the paper blank P is heated to be in a softened state, becomes easy to mold, and does not return to the shape before press molding, and is excellent in shape retention after press molding. . When the temperature is lower than 100 ° C., the molding takes time and the productivity is lowered, and the shape retention of the molded container is deteriorated, so that the stacking workability is deteriorated and the productivity is lowered.

（条件４）
容器１０（容器本体１１と蓋１２）の絞り深さ（容器本体１１の絞り深さｄ1又は蓋１２の絞り深さｄ2）を２０mm以上とする。これにより、絞り深さ２０mm以上の深絞り容器１０でも、上述(a)〜(e)を確保できる。 (Condition 4)
The squeezing depth of the container 10 (the container body 11 and the lid 12) (the squeezing depth d1 of the container body 11 or the squeezing depth d2 of the lid 12) is set to 20 mm or more. As a result, the above-described (a) to (e) can be secured even in the deep-drawn container 10 having a drawn depth of 20 mm or more.

尚、本発明の実施において、紙製ブランクＰを形成する低密度紙は、機械パルプ、カールドファイバー、及びマーセル化パルプの少なくとも一つから選ばれるパルプを主体として構成される。   In the implementation of the present invention, the low-density paper forming the paper blank P is mainly composed of a pulp selected from at least one of mechanical pulp, curled fiber, and mercerized pulp.

また、紙製ブランクＰを形成する低密度紙は、必要に応じて合成樹脂繊維を混合或いは貼り合わせることができる。パルプに混合されて低密度紙を構成する合成樹脂繊維としては、例えば、ポリエチレン繊維、ポリプロピレン繊維、ポリアミド繊維、ポリエチレンテレフタレート繊維、ポリブチレンテレフタレート繊維等を挙げることができる。低密度紙に貼り合わせる合成樹脂繊維としては、低密度紙にフィルムラミネート加工されるシート状のポリプロピレンフィルム、ポリブチレンテレフタレートフィルム等、又は低密度紙に押出ラミネート加工されるポリプロピレン、ポリブチレンテレフタレート等を挙げることができる。   Moreover, the low density paper which forms the paper blank P can mix or bond a synthetic resin fiber as needed. Examples of synthetic resin fibers that are mixed with pulp to form low-density paper include polyethylene fibers, polypropylene fibers, polyamide fibers, polyethylene terephthalate fibers, and polybutylene terephthalate fibers. Synthetic resin fibers to be bonded to low-density paper include sheet-like polypropylene film and polybutylene terephthalate film that are laminated on low-density paper, or polypropylene and polybutylene terephthalate that are extruded and laminated on low-density paper. Can be mentioned.

また、紙製ブランクＰを形成する低密度紙は、必要に応じてその片面、或いは両面に顔料と接着剤からなる塗工層を設けることができる。このような塗工層を設けることにより、成形加工原紙表面に良好な印刷適性を付与することができる。更に、染料インキ、顔料インキ等の任意のインキを用い、通常用いられる印刷機を使用して印刷層を設けることもできる。   Moreover, the low density paper which forms the paper blank P can provide the coating layer which consists of a pigment and an adhesive agent in the single side | surface or both surfaces as needed. By providing such a coating layer, good printability can be imparted to the surface of the forming raw paper. Furthermore, a printing layer can also be provided using arbitrary inks, such as dye ink and pigment ink, using the printer normally used.

また、紙製ブランクＰを形成する低密度紙は、必要に応じてその片面あるいは両面に、液体の浸み込みや液漏れを防止するために、耐水性被膜を設けることができる。この耐水性被膜は、原紙上に直接、もしくは前記顔料塗工層上、或いは印刷層上、任意の箇所に設けることができる。耐水性被膜は、耐水性塗料の塗工、合成樹脂のラミネート等により設けることができる。   Further, the low-density paper forming the paper blank P can be provided with a water-resistant coating on one side or both sides as necessary in order to prevent liquid permeation or liquid leakage. This water-resistant coating can be provided directly on the base paper, on the pigment coating layer, or on the printing layer at an arbitrary location. The water-resistant film can be provided by applying a water-resistant paint, laminating a synthetic resin, or the like.

以下、本発明方法の実験結果（表１〜表５）について説明する。
実験１〜５は、成形機（プレス機）を用いて、クッション原紙からなる紙製ブランクＰを一対の金型２０（雌型２１と雄型２２）で絞り成形して紙製容器１０の容器本体１１を製造したものである。実験１〜５の成形結果を示す表１〜表５により、紙製ブランクＰの密度、紙厚、坪量と成形結果（成形破れ、しわの程度、胴膨れの程度）の関係を示した。〇は「良い」、△は「ふつう（良いと悪いの間）」、×は「悪い」を表わす。 Hereinafter, experimental results (Tables 1 to 5) of the method of the present invention will be described.
In Experiments 1 to 5, using a molding machine (press machine), a paper blank P made of cushion base paper is drawn by a pair of molds 20 (female 21 and male 22), and the container of the paper container 10 is used. The main body 11 is manufactured. Tables 1 to 5 showing the molding results of Experiments 1 to 5 show the relationship between the density, paper thickness, and basis weight of the paper blank P and the molding results (molding breakage, degree of wrinkles, and degree of swelling). ◯ indicates “good”, Δ indicates “normal (between good and bad)”, and x indicates “bad”.

ここで、一対の金型２０のクリアランスは金型２０の部分によって異なり、各部のクリアランスを０．５mm〜０．８mmの範囲内にあるいずれかの値に設定した（容器本体１１の底部に相当する部分のクリアランスを０．５mm、容器本体１１の胴部（底部からの立ち上がり壁部）に相当する部分のクリアラスを０．８mmとした）。   Here, the clearance of the pair of molds 20 varies depending on the part of the mold 20, and the clearance of each part is set to any value within the range of 0.5 mm to 0.8 mm (corresponding to the bottom of the container body 11). The clearance of the portion to be used was 0.5 mm, and the clear lath of the portion corresponding to the body portion (the rising wall portion from the bottom portion) of the container body 11 was 0.8 mm).

尚、紙製容器１０の蓋１２についても同様の実験を行ない、同様の成形結果を得た。   The same experiment was conducted on the lid 12 of the paper container 10 and the same molding result was obtained.

実験１〜５において、一対の金型（雌型２１、雄型２２）を加熱し、紙製ブランクＰの成形温度を１００℃以上にした。   In Experiments 1-5, a pair of metal molds (female mold 21, male mold 22) were heated, and the molding temperature of the paper blank P was set to 100 ° C or higher.

また、実験１〜５において、一対の金型２０（雌型２１、雄型２２）が紙製ブランクＰに及ぼす成形圧力は、金型２０による紙製ブランクＰの加圧面積（３５０mm×５００mm）当たり１５トンとした。このとき、本発明方法の実施において、紙製ブランクＰに加える絞り成形の成形圧力はおよそ８．６kgf/cm2前後とすることができる。但し、この成形圧力は可変であり、０kgf/cm2程度にまで小さくすることもできる。 In Experiments 1 to 5, the molding pressure exerted on the paper blank P by the pair of molds 20 (female mold 21 and male mold 22) is the pressing area of the paper blank P by the mold 20 (350 mm × 500 mm). 15 tons per hit. At this time, in the implementation of the method of the present invention, the forming pressure of the drawing formed on the paper blank P can be about 8.6 kgf / cm 2 . However, this molding pressure is variable and can be reduced to about 0 kgf / cm 2 .

また、実験１〜５において、紙製容器１０における容器本体１１の絞り深さｄ1を２０mmとした。尚、金型２０の変更によって容器本体１１に及ぼし得る絞り深さｄ1の最大深さは、使用成形機の能力によって制限された７０mmであった。金型２０の変更によって絞り深さｄ1を２０mm〜７０mmの範囲で変化させても、実験１〜５と概ね同様の結果を確認できた。但し、本発明により製造され得る紙製容器１０の最大絞り深さは、使用成形機の能力によって一層深くでき、７０mmに限定されない。   In Experiments 1 to 5, the drawing depth d1 of the container body 11 in the paper container 10 was set to 20 mm. The maximum depth of the drawing depth d1 that can be exerted on the container body 11 by changing the mold 20 was 70 mm, which was limited by the capacity of the molding machine used. Even when the drawing depth d1 was changed in the range of 20 mm to 70 mm by changing the mold 20, the same results as in Experiments 1 to 5 could be confirmed. However, the maximum squeezing depth of the paper container 10 that can be manufactured according to the present invention can be made deeper depending on the capability of the molding machine used, and is not limited to 70 mm.

表１〜表５に示した実験１〜５の成形結果によれば、本発明方法に対応する実験例2-1、2-2、2-3、2-4、3-3、3-4、4-1、4-2において、紙製容器１０（容器本体１１と蓋１２）の成形しわを軽減させるとともに、容器の全体に渡る強度及び剛性（成形破れ及び胴膨れ）を向上できることが認められる。   According to the molding results of Experiments 1-5 shown in Tables 1-5, Experimental Examples 2-1, 2-2, 2-3, 2-4, 3-3, 3-4 corresponding to the method of the present invention. 4-1 and 4-2, it is recognized that the forming wrinkles of the paper container 10 (the container main body 11 and the lid 12) can be reduced, and the strength and rigidity (molding breakage and swelling) of the entire container can be improved. It is done.

Figure 2016141080
Figure 2016141080

Figure 2016141080
Figure 2016141080

Figure 2016141080
Figure 2016141080

Figure 2016141080
Figure 2016141080

Figure 2016141080
Figure 2016141080

以上、本発明の実施例を図面により詳述したが、本発明の具体的な構成はこの実施例に限られるものではなく、本発明の要旨を逸脱しない範囲の設計の変更等があっても本発明に含まれる。   The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. It is included in the present invention.

本発明によれば、紙製容器の成形しわを軽減させるとともに、容器の全体に渡る強度、剛性を向上できる。   According to the present invention, it is possible to reduce molding wrinkles of a paper container and improve the strength and rigidity of the entire container.

１０ 紙製容器
２０ 金型
Ｐ 紙製ブランク
Ｃ クリアランス
ｔ 紙厚
ｄ1〜ｄ2 絞り深さ 10 Paper container 20 Mold P Paper blank C Clearance t Paper thickness d1 to d2 Drawing depth

Claims (4)

紙製ブランクを一対の金型で絞り成形して紙製容器を製造する紙製容器の製造方法において、
紙製ブランクが、密度０．５０g/m3〜０．７５g/m3の低密度紙の一枚板、又は該低密度紙を複数枚重ねたものから形成され、
一対の金型の絞り成形時のクリアランスが紙製ブランクの紙厚より小さく設定されることを特徴とする紙製容器の製造方法。 In the paper container manufacturing method of manufacturing a paper container by drawing a paper blank with a pair of molds,
Paper blank, low density sheet single plate of a density of 0.50g / m 3 ~0.75g / m 3 , or formed a low density paper from those stacked plurality,
A method for producing a paper container, wherein a clearance at the time of drawing the pair of molds is set smaller than a paper thickness of the paper blank. 前記紙製ブランクを形成する低密度紙の坪量が２００g/m2〜７００g/m2である請求項１に記載の紙製容器の製造方法。 2. The method for producing a paper container according to claim 1, wherein a basis weight of the low density paper forming the paper blank is 200 g / m 2 to 700 g / m 2 . 前記絞り成形の成形温度を１００℃以上とする請求項１又は２に記載の紙製容器の製造方法。   The manufacturing method of the paper container of Claim 1 or 2 which sets the shaping | molding temperature of the said draw forming to 100 degreeC or more. 前記紙製容器の絞り深さを２０mm以上とする請求項１〜３のいずれかに記載の紙製容器の製造方法。   The manufacturing method of the paper container in any one of Claims 1-3 which makes the drawing depth of the said paper container 20 mm or more.
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CN112297517A (en) * 2019-11-01 2021-02-02 高野朗 Method for manufacturing cover member
WO2021084846A1 (en) * 2019-11-01 2021-05-06 朗 高野 Lid member and method for manufacturing same
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JP2022007860A (en) * 2019-11-01 2022-01-13 朗 高野 Lid member manufacturing method
JP2022007850A (en) * 2019-11-01 2022-01-13 朗 高野 Lid member
DE102022130532A1 (en) 2022-11-18 2024-05-23 Krones Aktiengesellschaft Method for producing a container comprising fibres and device for carrying out the method

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