JP2000313425A - Plastic container - Google Patents
Plastic containerInfo
- Publication number
- JP2000313425A JP2000313425A JP12286399A JP12286399A JP2000313425A JP 2000313425 A JP2000313425 A JP 2000313425A JP 12286399 A JP12286399 A JP 12286399A JP 12286399 A JP12286399 A JP 12286399A JP 2000313425 A JP2000313425 A JP 2000313425A
- Authority
- JP
- Japan
- Prior art keywords
- container
- resin composition
- weight
- strength
- plastic container
- 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
- 229920003023 plastic Polymers 0.000 title claims abstract description 19
- 239000004033 plastic Substances 0.000 title claims abstract description 19
- 239000011342 resin composition Substances 0.000 claims abstract description 26
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 22
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 22
- 239000000155 melt Substances 0.000 claims abstract description 9
- 229920000092 linear low density polyethylene Polymers 0.000 claims description 21
- 239000004707 linear low-density polyethylene Substances 0.000 claims description 21
- 229920001684 low density polyethylene Polymers 0.000 abstract 1
- 239000004702 low-density polyethylene Substances 0.000 abstract 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 9
- 239000011347 resin Substances 0.000 description 7
- 229920005989 resin Polymers 0.000 description 7
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 230000001788 irregular Effects 0.000 description 5
- 238000000465 moulding Methods 0.000 description 5
- 230000000704 physical effect Effects 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000000071 blow moulding Methods 0.000 description 3
- 235000013372 meat Nutrition 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000037303 wrinkles Effects 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000005708 Sodium hypochlorite Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- -1 polyoxyethylene lauryl ether sulfate Polymers 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006353 environmental stress Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Landscapes
- Containers Having Bodies Formed In One Piece (AREA)
- Details Of Rigid Or Semi-Rigid Containers (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、廃棄時に潰し易い
プラスチック容器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic container which is easily crushed at the time of disposal.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】中空プ
ラスチック容器は、環境応力亀裂抵抗性（以下、耐ＥＳ
Ｃ強度という）及び落下強度等の強度に優れることが必
要である。従来のプラスチック容器は、これらの強度を
向上させるため、高密度ポリエチレンの単体からなる樹
脂を用いて厚肉で成形されていた。しかし、近年、環境
問題への対応として、プラスチック容器の廃棄性が重要
視されてきている。このため、プラスチック容器は、薄
肉化されること及び廃棄時に潰し易いことが要請されて
いる。2. Description of the Related Art Hollow plastic containers have environmental stress crack resistance (hereinafter referred to as ES resistance).
C strength) and excellent strength such as drop strength. Conventional plastic containers have been formed to be thick with a resin made of a single body of high-density polyethylene in order to improve their strength. However, in recent years, disposal of plastic containers has been emphasized as a measure against environmental problems. For this reason, the plastic container is required to be thinner and to be easily crushed at the time of disposal.
【０００３】これらの要請に対応すべく、プラスチック
容器の成形樹脂として、柔らかい樹脂を使用した場合
は、耐ＥＳＣ強度及び落下強度を損なわない容器を得る
ことができるが、安定した成形性に問題があった。In order to meet these demands, when a soft resin is used as a molding resin for a plastic container, a container which does not impair the ESC resistance and the drop strength can be obtained, but there is a problem in stable moldability. there were.
【０００４】ところで、特開平３−１１５３４１号公報
では、表面光沢に優れ且つ摩擦係数の低い中空成形品を
提供することを目的として、外表面が、メルトインデッ
クス１．０〜３．０ｇ／１０分、密度０．９３５ｇ／ｃ
ｍ3 以下の直鎖状低密度ポリエチレン２５〜７５重量％
と、メルトインデックス０．１〜１．５ｇ／１０分、密
度０．９４２ｇ／ｃｍ3 以上の高密度ポリエチレン７５
〜２５重量％との混合物からなる中空成形容器が提案さ
れている。しかし、この中空成形容器は、メルトインデ
ックスが１．０以上のＬＬＤＰＥを使用しているため、
容器の成形性、特に横断面が異形である大容積の容器の
成形性が悪い。Japanese Patent Application Laid-Open No. 3-115341 discloses a hollow molded article having an outer surface having a melt index of 1.0 to 3.0 g / 10 min. , Density 0.935g / c
25 to 75% by weight of linear low density polyethylene of m 3 or less
And a high-density polyethylene 75 having a melt index of 0.1 to 1.5 g / 10 min and a density of 0.942 g / cm 3 or more
A hollow molded container comprising a mixture of 25% by weight is proposed. However, since this hollow molded container uses LLDPE having a melt index of 1.0 or more,
The moldability of the container, particularly the moldability of a large-volume container having an irregular cross section, is poor.
【０００５】従って、本発明の目的は、薄肉に成形して
も、安定した成形ができ、耐ＥＳＣ強度及び落下強度に
優れ、廃棄時に潰し易いプラスチック容器を提供するこ
とにある。Accordingly, an object of the present invention is to provide a plastic container which can be formed stably even when it is formed to be thin, has excellent ESC resistance and drop strength, and is easily crushed at the time of disposal.
【０００６】[0006]
【課題を解決するための手段】本発明は、メルトインデ
ックスが０．１ｇ／１０分以上１．０ｇ／１０分未満の
高密度ポリエチレン７０〜５０重量％と、メルトインデ
ックスが０．１ｇ／１０分以上１．０ｇ／１０分未満の
直鎖状低密度ポリエチレン３０〜５０重量％とを含む樹
脂組成物から成形されたプラスチック容器を提供するこ
とにより前記目的を達成したものである。According to the present invention, there is provided a high-density polyethylene having a melt index of 0.1 g / 10 min. To less than 1.0 g / 10 min. The above object has been achieved by providing a plastic container molded from a resin composition containing 30 to 50% by weight of a linear low-density polyethylene having a content of 1.0 g / 10 minutes or less.
【０００７】[0007]
【発明の実施の形態】以下、本発明をその好ましい実施
形態に基づいて図１を参照しながら詳細に説明する。図
１は、本発明のプラスチック容器の一実施形態としての
中空容器を示す斜視図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on a preferred embodiment with reference to FIG. FIG. 1 is a perspective view showing a hollow container as one embodiment of the plastic container of the present invention.
【０００８】本実施形態の中空容器１は、図１に示すよ
うに、横断面が円形でなく異形であり且つ把手２を有す
る大容積の容器である。本実施形態の中空容器１は、特
定の高密度ポリエチレン（以下、ＨＤＰＥという）と、
特定の直鎖状低密度ポリエチレン（以下、ＬＬＤＰＥと
いう）とを含む樹脂組成物から成形されている。As shown in FIG. 1, a hollow container 1 of the present embodiment is a large-capacity container having a handle 2 with a cross section that is not circular but irregular. The hollow container 1 of the present embodiment includes a specific high-density polyethylene (hereinafter, referred to as HDPE),
It is molded from a resin composition containing a specific linear low-density polyethylene (hereinafter, referred to as LLDPE).
【０００９】前記ＨＤＰＥは、そのメルトインデックス
（以下、ＭＩという）が０．１ｇ／１０分以上１．０ｇ
／１０分未満、好ましくは０．２〜０．８ｇ／１０分、
更に好ましくは０．２〜０．５ｇ／１０分未満である。
該ＨＤＰＥのＭＩが０．１ｇ／１０分未満であると成形
機での樹脂の押出性が悪くなり、１．０ｇ／１０分以上
であると容器の成形性が悪くなる。ＭＩは、ＡＳＴＭ
Ｄ１２３８に従い測定されたものである（以下、ＭＩと
いうときにはこの測定条件下でのものをいう）。The HDPE has a melt index (hereinafter, referred to as MI) of 0.1 g / 10 min or more and 1.0 g.
Less than / 10 minutes, preferably 0.2 to 0.8 g / 10 minutes,
More preferably, it is less than 0.2 to less than 0.5 g / 10 min.
If the MI of the HDPE is less than 0.1 g / 10 minutes, the extrudability of the resin in a molding machine will be poor, and if it is 1.0 g / 10 minutes or more, the moldability of the container will be poor. MI is ASTM
It is measured according to D1238 (hereinafter referred to as MI under these measurement conditions).
【００１０】前記ＬＬＤＰＥは、そのＭＩが０．１ｇ／
１０分以上１．０ｇ／１０分未満、好ましくは０．２〜
０．８ｇ／１０分、更に好ましくは０．２〜０．５ｇ／
１０分である。該ＬＬＤＰＥのＭＩを、前記範囲とする
ことにより、これらを含む樹脂組成物のＭＩを調整し、
特にブロー成形時におけるパリソンのドローダウンを抑
え、ＨＤＰＥを単独で用いた場合と同様の優れた成形性
が得られる。また、特に横断面が円形でなく異形で且つ
把手を有する薄肉の大容積の容器の成形が容易となり、
成形のブローピンを打込む際にブローピンにより容器ノ
ズル部の樹脂を容器内部に余分に持ち込むことにより発
生する肉溜り（ノズル部肉持込み）、パリソンを金型で
挟んだ後にブローする際に把手部付近のパリソンが接触
し把手部をふさぐように形成される膜張り、パリソンの
しわによる底部の肉溜り等の不良現象を防止することが
できる。The LLDPE has an MI of 0.1 g /
10 minutes or more and less than 1.0 g / 10 minutes, preferably 0.2 to
0.8 g / 10 min, more preferably 0.2 to 0.5 g /
10 minutes. By adjusting the MI of the LLDPE to the above range, the MI of the resin composition containing these is adjusted,
In particular, the drawdown of the parison during blow molding is suppressed, and the same excellent moldability as when HDPE is used alone is obtained. In addition, it is particularly easy to form a thin large-volume container having a handle with a handle having a cross section that is not circular and is irregular in shape,
Meat pool (nozzle meat carry-in) generated by excessively bringing the resin in the container nozzle part into the container by the blow pin when driving the blow pin for molding, and near the handle when the parison is blown after being sandwiched by the mold This prevents the occurrence of defective phenomena such as film formation formed so that the parison contacts and closes the handle, and that the bottom of the parison wrinkles due to the wrinkles of the parison.
【００１１】前記樹脂組成物における前記ＨＤＰＥと前
記ＬＬＤＰＥとの混合比は、ＨＤＰＥ７０〜５０重量％
及びＬＬＤＰＥ３０〜５０重量％であり、好ましくはＨ
ＤＰＥ６０〜５０重量％及びＬＬＤＰＥ４０〜５０重量
％である。該混合比を前記範囲に調整することにより、
得られる容器の落下強度、圧縮強度及び耐ＥＳＣ強度を
コントロールできるため、所望の耐ＥＳＣ強度及び落下
強度に優れ、所望の潰し易さ及び所望の復元性を有する
容器を得ることができる。前記ＨＤＰＥが７０重量％を
超えるか又は前記ＬＬＤＰＥが３０重量％未満である
と、耐ＥＳＣ強度が低下するか又は潰し易さが得られな
くなり、前記ＨＤＰＥが５０重量％未満であるか又は前
記ＬＬＤＰＥが５０重量％を超えると、圧縮強度が低下
するか又はラインプレッシャによる変形が生じる。The mixing ratio of the HDPE and the LLDPE in the resin composition is from 70 to 50% by weight of HDPE.
And LLDPE in an amount of 30 to 50% by weight, preferably H
60 to 50% by weight of DPE and 40 to 50% by weight of LLDPE. By adjusting the mixing ratio to the above range,
Since the drop strength, compressive strength and ESC resistance of the obtained container can be controlled, a container having desired ESC resistance and drop strength, having desired easiness of crushing and desired resilience can be obtained. If the HDPE is more than 70% by weight or the LLDPE is less than 30% by weight, the ESC resistance is reduced or the crushability is not easily obtained, and the HDPE is less than 50% by weight or the LLDPE. Exceeds 50% by weight, the compressive strength decreases or deformation due to line pressure occurs.
【００１２】前記樹脂組成物には、前記ＨＤＰＥ及び前
記ＬＬＤＰＥ以外の樹脂を本発明の効果を損なわない範
囲で添加することもできる。また、顔料、帯電防止剤、
酸化防止剤、分散剤、紫外線吸収剤等の添加物を添加す
ることもできる。この場合、前記ＨＤＰＥ及び前記ＬＬ
ＤＰＥ以外の成分は、前記樹脂組成物中に、好ましくは
１０重量％以下、更に好ましくは５重量％以下含有され
る。A resin other than the HDPE and the LLDPE may be added to the resin composition as long as the effects of the present invention are not impaired. Also, pigments, antistatic agents,
Additives such as antioxidants, dispersants, and ultraviolet absorbers can also be added. In this case, the HDPE and the LL
Components other than DPE are contained in the resin composition preferably at 10% by weight or less, more preferably at 5% by weight or less.
【００１３】前記樹脂組成物は、その密度（ＡＳＴＭ−
Ｄ１５０５）が好ましくは０．９３〜０．９５ｇ／ｃｍ
3 、更に好ましくは０．９３５〜０．９４５ｇ／ｃｍ3
である。該密度が前記範囲であると、圧縮強度を満足
し、落下強度及び耐ＥＳＣ強度等の物性に一層優れ、所
望の潰し易さ及び所望の復元性を有する薄肉の容器が低
コストで得られるため好ましい。The resin composition has a density (ASTM-
D1505) is preferably 0.93 to 0.95 g / cm.
3 , more preferably 0.935 to 0.945 g / cm 3
It is. When the density is within the above range, a thin container having satisfactory compressive strength, more excellent physical properties such as drop strength and ESC resistance, and having desired easiness of crushing and desired resilience can be obtained at low cost. preferable.
【００１４】前記樹脂組成物の剛性（オルゼン剛性及び
曲げ弾性）は、前記樹脂組成物の密度と相関関係があ
る。このため、本実施形態の中空容器は、前記樹脂組成
物の密度を前記範囲に制御することにより、所望の剛性
が得られる。そして、このように所望の剛性を有する
と、圧縮強度を満足し、落下強度及び耐ＥＳＣ強度等の
物性に一層優れ、所望の潰し易さ及び所望の復元性を有
する中空容器が得られるため好ましい。The rigidity (Olzen rigidity and bending elasticity) of the resin composition has a correlation with the density of the resin composition. For this reason, the hollow container of the present embodiment can obtain desired rigidity by controlling the density of the resin composition within the above range. It is preferable to have a desired rigidity because a hollow container having satisfactory physical properties such as a drop strength and an ESC resistance, a desired easiness of crushing and a desired resilience can be obtained. .
【００１５】本実施形態の中空容器を成形する際の成形
法としては、ブロー成形法が用いられる。A blow molding method is used as a molding method for molding the hollow container of the present embodiment.
【００１６】本実施形態の中空容器の圧縮強度は、好ま
しくは３９０Ｎ以上である。圧縮強度が低すぎると容器
が収容されたダンボールを段積みにしたときに荷崩れし
易くなる。（ダンボールの段積み強度）＝（中空容器の
圧縮強度）＋（ダンボールの圧縮強度）という関係があ
ることから、ダンボールの段積み強度を上げるために、
ダンボールの圧縮強度を高くすることも一つの手段では
あるが、中空容器の圧縮強度が低すぎるとダンボールの
経費高となったり、ダンボールが強くなりすぎて折り込
みが困難となる。また、段積み強度を上げるために、ダ
ンボールへの中空容器の入数を少なくすることも一つの
手段ではあるが、その場合には大幅に経費高となってし
まう。圧縮強度の測定法は、実施例において詳述する。The compressive strength of the hollow container of the present embodiment is preferably 390 N or more. If the compressive strength is too low, the cargo tends to collapse when the cardboard containing the containers is stacked. Since there is a relationship of (stacking strength of cardboard) = (compression strength of hollow container) + (compression strength of cardboard), in order to increase the stacking strength of cardboard,
One means is to increase the compressive strength of the cardboard. However, if the compressive strength of the hollow container is too low, the cost of the cardboard increases, or the cardboard becomes too strong, making it difficult to fold. In order to increase the stacking strength, reducing the number of hollow containers in the corrugated cardboard is one means, but in this case, the cost is greatly increased. The method for measuring the compressive strength will be described in detail in Examples.
【００１７】本実施形態の中空容器の耐ＥＳＣ強度は、
ＦＯが好ましくは５００時間以上、更に好ましくは１０
００時間以上である。本発明において、耐ＥＳＣ強度
は、容器の中に、次亜塩素酸ナトリウム（南海化学社
製）６重量％、水酸化ナトリウム０．５重量％、ポリオ
キシエチレンラウリルエーテル硫酸ナトリウム（商品名
「エマール７０Ｃ」、花王（株）製）０．５重量％及び
イオン交換水残部からなる溶液を０．６リットル加え、
密封後、この容器を恒温下（５０℃）に１０００時間以
上）保存したときの容器の割れの発生し難さを示す。な
お、ＦＯとは、容器のサンプル１０本に対して１本目が
割れる時間を表す。The ESC resistance of the hollow container of the present embodiment is as follows:
FO is preferably 500 hours or more, more preferably 10 hours or more.
00 hours or more. In the present invention, the ESC resistance is as follows: in a container, 6% by weight of sodium hypochlorite (Nankai Chemical Co., Ltd.), 0.5% by weight of sodium hydroxide, sodium polyoxyethylene lauryl ether sulfate (trade name “Emar 0.6L of a solution consisting of 0.5% by weight of "70C", manufactured by Kao Corporation) and the balance of ion-exchanged water,
This indicates that the container is unlikely to crack when the container is stored at a constant temperature (50 ° C. for 1000 hours or more) after sealing. In addition, FO represents the time during which the first sample is broken for 10 sample containers.
【００１８】本実施形態の中空容器は、図１に示すよう
に、横断面が円形でなく異形であり且つ把手を有する大
容積の容器であり、この容器の容積は、好ましくは１リ
ットル以上、更に好ましくは２〜６リットルである。こ
のような大容積の容器であるにもかかわらず、本実施形
態の中空容器は、その成形性を損なわずに、容器胴部に
おけるラベル貼り付け部３の中央部Ａ（図１参照）の肉
厚を、０．３〜０．８ｍｍ、特に０．４〜０．６ｍｍと
いう薄肉のものにすることができる。As shown in FIG. 1, the hollow container according to the present embodiment is a large-capacity container having a handle having a handle having a cross section that is not circular but an irregular shape, and preferably has a volume of 1 liter or more. More preferably, it is 2 to 6 liters. Despite being such a large-capacity container, the hollow container of the present embodiment has the meat of the central portion A (see FIG. 1) of the label sticking portion 3 in the container body without impairing its moldability. The thickness can be as thin as 0.3-0.8 mm, especially 0.4-0.6 mm.
【００１９】本実施形態の中空容器は、例えば、住居用
や衣料用等の液体洗剤製品等の容器として用いられる。The hollow container of the present embodiment is used, for example, as a container for liquid detergent products and the like for housing and clothing.
【００２０】[0020]
【実施例】以下、実施例及び比較例により、本発明のプ
ラスチック容器を更に詳細に説明する。EXAMPLES Hereinafter, the plastic container of the present invention will be described in more detail with reference to Examples and Comparative Examples.
【００２１】〔実施例１〜４及び比較例１〜４〕表１に
示すＭＩのＨＤＰＥ及びＬＬＤＰＥを、表１に示す混合
比で混合し、表１に示す密度の樹脂組成物を得た。該樹
脂組成物を用いてブロー成形法により、入れ目量が５リ
ットルである、図１に示す形状の中空容器を成形した。
得られた容器胴部におけるラベル貼り付け部３の中央部
Ａ（製品としたときに容器胴部における中央部で品質表
示を貼り付け、パーテングラインを含まない部分；図１
参照）の肉厚を表１に示す。各中空容器について、下記
（１）〜（８）の評価・測定を行った。結果を表１に示
す。Examples 1 to 4 and Comparative Examples 1 to 4 HDPE and LLDPE of MI shown in Table 1 were mixed at a mixing ratio shown in Table 1 to obtain a resin composition having a density shown in Table 1. Using the resin composition, a hollow container having a filling amount of 5 liters and having a shape shown in FIG. 1 was formed by a blow molding method.
The central part A of the label sticking part 3 in the obtained container body (when a product is manufactured, the quality indication is pasted at the center part of the container body and a part not including the parting line; FIG. 1)
Table 1). The following (1) to (8) were evaluated and measured for each hollow container. Table 1 shows the results.
【００２２】（１）成形性 容器の成形性が良好なものを○、成形性が悪いものを×
とした。成形性が悪いとは、容器ノズル部での樹脂持ち
こみや把手部に膜張りが発生したり、パリソンのドロー
ダウンによりパリソン肉厚制御が困難となることをい
う。 （２）落下強度 １０本の空容器にそれぞれ溶液（比重１．１〜１．２の
食塩水）５ｋｇを入れ密封後、各容器を１ｍの高さから
正立状態で１０回落下させたときに、１本も割れが発生
しなかった場合を○、１本でも割れが発生したものを×
とした。 （３）横圧縮係数 空容器を密封せずに、容器胴部におけるラベル貼り付け
部の中央部を圧縮試験機で５０ｍｍ／ｍｉｎで押したと
きに、（圧縮力）／（ストローク）〔Ｎ／ｍｍ〕として
測定した。なお、この値が１．５〔Ｎ／ｍｍ〕以下の場
合を○とし、１．５〔Ｎ／ｍｍ〕超の場合を×とした。
○の評価のものは潰し易い容器であることを示し、×の
評価のものは潰し難い容器であることを示す。 （４）潰し易さ １０人のパネラーが任意の方法で空容器を潰した場合
に、１０人全員が潰し難いと感じたときを××、５〜９
人が潰し難いと感じたときを×、潰し難いと感じた人が
４人以下であるときを○として評価した。(1) Moldability The container having good moldability was evaluated as ○, and the container with poor moldability was evaluated as ×.
And Poor moldability means that the resin is brought into the container nozzle portion, the film is formed on the grip portion, and the parison thickness is difficult to control due to the drawdown of the parison. (2) Drop strength When 5 kg of a solution (saline solution having a specific gravity of 1.1 to 1.2) is placed in each of 10 empty containers and sealed, and each container is dropped 10 times in an upright state from a height of 1 m. In addition, the case where none of the cracks occurred was evaluated as ○, and the case where even one crack occurred was evaluated as ×
And (3) Lateral compression coefficient When the central part of the label sticking part in the container body is pressed at 50 mm / min with a compression tester without sealing the empty container, (compression force) / (stroke) [N / mm]. In addition, when this value was 1.5 [N / mm] or less, it was evaluated as ○, and when this value exceeded 1.5 [N / mm], it was evaluated as x.
A rating of ○ indicates that the container is easily crushed, and a rating of × indicates that the container is difficult to crush. (4) Ease of crushing When ten panelists crush empty containers by any method, xx, 5 to 9 when all ten people find it difficult to crush.
When the person felt that it was difficult to crush, it was evaluated as x, and when four or less people felt that it was difficult to crush, it was evaluated as ○.
【００２３】（５）耐ＥＳＣ強度 容器の中に、次亜塩素酸ナトリウム（南海化学社製）６
重量％、水酸化ナトリウム０．５重量％、ポリオキシエ
チレンラウリルエーテル硫酸ナトリウム（商品名「エマ
ール７０Ｃ」、花王（株）製）０．５重量％及びイオン
交換水残部からなる溶液を０．６リットル加え、密封
後、この容器を恒温下（５０℃）に１０００時間以上）
保存したときの容器の割れの発生し難さを示す。なお、
ＦＯとは、容器のサンプル１０本に対して１本目が割れ
る時間を表す。５００時間保存後に１本も割れていない
場合を○、５００時間以内に１本でも割れが発生する場
合を×として評価した。 （６）ラインプレッシャによる変形 空の中空容器を搬送コンベアに流したときに、容器同士
がぶつかりあうことによる容器の変形の有無を目視で確
認し、変形がない場合を○、変改がある場合を×として
評価した。。 （７）圧縮強度 容器に溶液（比重１．１〜１．２の食塩水）５ｋｇを入
れ密封後、容器を正立状態にし、頭頂部を、汎用の圧縮
試験機により２０ｍｍ／ｍｉｎの速さで押したときの降
伏点での荷重（Ｎ）を測定した。この圧縮強度が３９０
Ｎ以上を○とし、３９０Ｎ未満を×として評価した。な
お、圧縮強度が低すぎると、段ボールを段積みにしたと
きに荷崩れし易くなる。 （８）総合評価 各中空容器について、下記の基準により総合評価をし
た。 ○；前記（１）〜（７）のすべてが○の評価の場合。 ×；前記（１）〜（７）のうち１つでも○でない評価の
場合。(5) ESC-resistant strength In a container, sodium hypochlorite (manufactured by Nankai Chemical Co., Ltd.) 6
A solution consisting of 0.5% by weight of sodium hydroxide, 0.5% by weight of sodium hydroxide, 0.5% by weight of sodium polyoxyethylene lauryl ether sulfate (trade name "Emal 70C", manufactured by Kao Corporation), and 0.6% by weight of the remaining ion-exchanged water was used. After adding liters and sealing, the container is kept at a constant temperature (50 ° C.) for 1000 hours or more.)
It shows the difficulty of cracking of the container when stored. In addition,
FO represents the time during which the first sample is broken for 10 sample containers. The case where no crack was found after storage for 500 hours was evaluated as 、, and the case where even one crack occurred within 500 hours was evaluated as x. (6) Deformation due to line pressure When empty hollow containers are fed to the conveyor, it is visually checked whether or not the containers are deformed due to collisions between the containers. Was evaluated as x. . (7) Compressive strength After putting 5 kg of a solution (saline solution having a specific gravity of 1.1 to 1.2) into a container and sealing the container, the container is placed in an upright state, and the crown is moved at a speed of 20 mm / min using a general-purpose compression tester. The load (N) at the yield point when pressed was measured. This compressive strength is 390
N or more was evaluated as ○, and less than 390 N was evaluated as ×. In addition, when the compressive strength is too low, when the cardboard is stacked, the load easily collapses. (8) Comprehensive evaluation Each hollow container was comprehensively evaluated according to the following criteria. ；: All of the above (1) to (7) were evaluated as ○. X: In the case of evaluation in which at least one of the above (1) to (7) is not ○.
【００２４】[0024]
【表１】 [Table 1]
【００２５】表１の結果より明らかなように、ＨＤＰＥ
１００重量％からなる樹脂組成物から成形された、ラベ
ル貼り付け部の中央部の肉厚が０．８ｍｍの中空容器
（比較例１）は、手では潰すことができない。また、Ｈ
ＤＰＥ１００重量％からなる樹脂組成物から成形され
た、ラベル貼り付け部の中央部の肉厚が０．５ｍｍの中
空容器（比較例２）は、落下強度が悪い。このように、
ＨＤＰＥ１００重量％からなる樹脂組成物を用いても、
落下強度を満足し且つ潰し易い中空容器が得られないこ
とが判る。As is clear from the results in Table 1, HDPE
A hollow container (Comparative Example 1) formed from a resin composition containing 100% by weight and having a thickness of 0.8 mm at the center of the label attachment portion (Comparative Example 1) cannot be crushed by hand. Also, H
A hollow container (Comparative Example 2) molded from a resin composition consisting of 100% by weight of DPE and having a thickness of 0.5 mm at the center of the label attachment portion (Comparative Example 2) has poor drop strength. in this way,
Even if a resin composition consisting of 100% by weight of HDPE is used,
It can be seen that a hollow container satisfying the drop strength and easily crushable cannot be obtained.
【００２６】ＨＤＰＥにＬＬＤＰＥを３０〜５０重量％
で混合してなる樹脂組成物であっても、該ＬＬＤＰＥの
ＭＩが１．０ｇ／１０分以上のものを用いたものを用い
て容器を成形すると、成形性が悪いものとなる。具体的
には、比較例３に示すように、ＭＩが０．３ｇ／１０分
のＨＤＰＥとＭＩが２．８ｇ／１０分のＬＬＤＰＥとを
混合してなる樹脂組成物を用いて容器を成形すると、パ
リソンのドローダウンが大きく、容器の肉厚制御が困難
となる。更に、パリソンのしわが大きいものとなり、折
れ曲がり金型で挟まれたところにリブができる。また、
ＬＬＤＰＥを５０重量％を超えて混合した樹脂組成物を
用いて容器を成形した場合（比較例４）では、ラインプ
レッシャによる変形が発生し、圧縮強度が極端に低下し
た。このため、この容器では、ライン改造やダンボール
の大幅な強度アップ等のための大幅なコストアップの必
要が生じる。なお、表１には示していないが、ＭＩが
１．０ｇ／１０分のＬＬＤＰＥを混合した樹脂組成物を
用いて容器を成形したところ、連続生産における安定し
た成形性を行うことが困難であった。HDPE with LLDPE at 30-50% by weight
When a container is formed using a resin composition having a MI of 1.0 g / 10 min or more of the LLDPE even if the resin composition is mixed with the above, the moldability becomes poor. Specifically, as shown in Comparative Example 3, when a container is molded using a resin composition obtained by mixing HDPE having an MI of 0.3 g / 10 min and LLDPE having a MI of 2.8 g / 10 min. In addition, the drawdown of the parison is large, and it is difficult to control the thickness of the container. Further, the wrinkles of the parison become large, and ribs are formed where the parison is sandwiched between the bent dies. Also,
When a container was molded using a resin composition in which LLDPE was mixed in an amount exceeding 50% by weight (Comparative Example 4), deformation due to line pressure occurred, and the compressive strength was extremely reduced. For this reason, in this container, it is necessary to significantly increase the cost for remodeling the line and significantly increasing the strength of the cardboard. Although not shown in Table 1, when a container was molded using a resin composition mixed with LLDPE having an MI of 1.0 g / 10 min, it was difficult to perform stable moldability in continuous production. Was.
【００２７】これに対し、ＭＩが０．１ｇ／１０分以上
１．０ｇ／１０分未満のＨＤＰＥに、ＭＩが０．１ｇ／
１０分以上１．０ｇ／１０分未満のＬＬＤＰＥを３０〜
５０重量％で混合してなる樹脂組成物から成形してなる
実施例１〜４のブロー成形容器（本発明品）は、ラベル
貼り付け部の中央部の肉厚を０．５ｍｍと薄膜にしても
成形性が損なわれず、落下強度等の物性を満足し且つ潰
し易いものである。例えば、実施例１〜４のブロー成形
容器では、耐ＥＳＣ強度が比較例１及び２のものの２倍
以上となる。このように、実施例１〜４のブロー成形容
器は、成形性、落下強度、耐ＥＳＣ強度等の物性を損な
うことなく、薄肉化が可能となった。In contrast, HDPE having an MI of 0.1 g / 10 min or more and less than 1.0 g / 10 min has a MI of 0.1 g / min.
LLDPE of 10 minutes or more and less than 1.0 g / 10 minutes from 30 to
The blow-molded containers (products of the present invention) of Examples 1 to 4 which were molded from the resin composition mixed at 50% by weight had a thickness of 0.5 mm at the center of the label affixing portion and a thin film. Also, the moldability is not impaired, the physical properties such as drop strength are satisfied and the material is easily crushed. For example, in the blow molded containers of Examples 1 to 4, the ESC resistance is twice or more that of Comparative Examples 1 and 2. As described above, the blow-molded containers of Examples 1 to 4 can be thinned without impairing physical properties such as moldability, drop strength, and ESC resistance.
【００２８】[0028]
【発明の効果】本発明のプラスチック容器は、薄肉にし
ても成形性が損なわれず、耐ＥＳＣ強度及び落下強度に
優れ、廃棄時に潰し易いものである。本発明のプラスチ
ック容器は、特に、横断面が異形であり且つ把手を有す
る大容積の容器であるときに、薄肉にしても成形性が損
なわれず、耐ＥＳＣ強度及び落下強度に優れ、廃棄時に
潰し易くなるという効果が一層顕著となる。The plastic container of the present invention does not impair moldability even if it is thin, has excellent ESC resistance and drop strength, and is easily crushed at the time of disposal. The plastic container of the present invention, particularly when it is a large-volume container having an irregular cross section and a handle, does not impair moldability even if it is thin, has excellent ESC strength and drop strength, and is crushed during disposal. The effect of becoming easy becomes more remarkable.
【図１】図１は、本発明のプラスチック容器の一実施形
態としての中空容器を示す斜視図である。FIG. 1 is a perspective view showing a hollow container as one embodiment of a plastic container of the present invention.
１ 中空容器 ２ 把手 ３ ラベル貼り付け部 DESCRIPTION OF SYMBOLS 1 Hollow container 2 Handle 3 Label attaching part
───────────────────────────────────────────────────── フロントページの続き (72)発明者 坂爪 貴志 栃木県芳賀郡市貝町赤羽2606 花王株式会 社研究所内 (72)発明者 山野井 満夫 栃木県芳賀郡市貝町赤羽2606 花王株式会 社研究所内 Ｆターム(参考） 3E033 AA20 BA15 BB04 CA02 CA17 CA20 DA03 DB03 DD01 DE02 EA04 FA03 GA02 4F208 AA05C AA07C AG07 AG29 AH55 AR15 AR17 AR18 LB01 LG01 4J002 BB031 BB032 GG01 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Takashi Sakazume 2606 Kabane-cho, Akaga-cho, Haga-gun, Tochigi Pref. In the Kao Corporation Research Institute Terms (reference) 3E033 AA20 BA15 BB04 CA02 CA17 CA20 DA03 DB03 DD01 DE02 EA04 FA03 GA02 4F208 AA05C AA07C AG07 AG29 AH55 AR15 AR17 AR18 LB01 LG01 4J002 BB031 BB032 GG01
Claims (3)
以上１．０ｇ／１０分未満の高密度ポリエチレン７０〜
５０重量％と、メルトインデックスが０．１ｇ／１０分
以上１．０ｇ／１０分未満の直鎖状低密度ポリエチレン
３０〜５０重量％とを含む樹脂組成物から成形されたプ
ラスチック容器。1. A high-density polyethylene having a melt index of 0.1 g / 10 min or more and less than 1.0 g / 10 min.
A plastic container molded from a resin composition containing 50% by weight and 30 to 50% by weight of a linear low-density polyethylene having a melt index of 0.1 g / 10 minutes or more and less than 1.0 g / 10 minutes.
９５ｇ／ｃｍ3 である、請求項１記載のプラスチック容
器。2. The resin composition according to claim 1, wherein said resin composition has a density of 0.93 to 0.1.
Is 95 g / cm 3, a plastic container of claim 1, wherein.
項１又は２記載のプラスチック容器。3. The plastic container according to claim 1, which is a large-capacity container having a handle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12286399A JP2000313425A (en) | 1999-04-28 | 1999-04-28 | Plastic container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12286399A JP2000313425A (en) | 1999-04-28 | 1999-04-28 | Plastic container |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000313425A true JP2000313425A (en) | 2000-11-14 |
Family
ID=14846509
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12286399A Pending JP2000313425A (en) | 1999-04-28 | 1999-04-28 | Plastic container |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000313425A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003045790A1 (en) * | 2001-11-30 | 2003-06-05 | Honeywell Specialty Chemicals Seelze Gmbh | Chemical container for high-pure chemicals |
| JP2006193671A (en) * | 2005-01-17 | 2006-07-27 | Nippon Polyethylene Kk | Polyethylene resin material and hollow molded article made thereof |
| CN101859087A (en) * | 2009-04-08 | 2010-10-13 | 柯尼卡美能达商用科技株式会社 | Toner container and image forming method |
| JP2015527260A (en) * | 2012-06-29 | 2015-09-17 | ザ プロクター アンド ギャンブルカンパニー | Laundry detergent packaging with pre-treatment function |
-
1999
- 1999-04-28 JP JP12286399A patent/JP2000313425A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003045790A1 (en) * | 2001-11-30 | 2003-06-05 | Honeywell Specialty Chemicals Seelze Gmbh | Chemical container for high-pure chemicals |
| JP2006193671A (en) * | 2005-01-17 | 2006-07-27 | Nippon Polyethylene Kk | Polyethylene resin material and hollow molded article made thereof |
| CN101859087A (en) * | 2009-04-08 | 2010-10-13 | 柯尼卡美能达商用科技株式会社 | Toner container and image forming method |
| JP2015527260A (en) * | 2012-06-29 | 2015-09-17 | ザ プロクター アンド ギャンブルカンパニー | Laundry detergent packaging with pre-treatment function |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20090110855A1 (en) | Filled Polystyrene Compositions and Uses Thereof | |
| EP2285892B1 (en) | Polymeric compositions and articles comprising polylactic acid and polyolefin | |
| AU668879B2 (en) | Pouch for packaging flowable materials | |
| CN111819079B (en) | Recoverable plastic package | |
| EP0129890A1 (en) | Cup and three-layer structure sheet suitable for producing a cup. | |
| WO2008032841A1 (en) | Polypropylene cup type container and molding method thereof | |
| EP3131822B1 (en) | Molded article formed from post consumer recycled material | |
| EP2292685B1 (en) | Bottle cap made from a material comprising polypropylene, particulate calcium carbonate and additives | |
| CA2090593C (en) | Plastic container made from a fusion blend of post consumer plastic and ethylene polymers | |
| KR20020042621A (en) | Labelled resin bottle | |
| JP3703417B2 (en) | Packaging with improved axial stiffness and breaking strength | |
| JP2000313425A (en) | Plastic container | |
| US4719143A (en) | Multilayer polyethylene articles | |
| JP4622198B2 (en) | Light weight multi-layer plastic container and manufacturing method thereof | |
| JP2002173123A (en) | Container for viscous food | |
| JP2004067110A (en) | Squeeze bottle | |
| JP3008773B2 (en) | Multilayer plastic container | |
| JP2005307122A (en) | Low density polyethylene resin composition for extrusion molding | |
| JP3064792B2 (en) | Multilayer plastic container | |
| JP3378553B2 (en) | Thin hollow molded container | |
| JPS6351178B2 (en) | ||
| JP3322136B2 (en) | Composite container | |
| JP3026892B2 (en) | Multi-layer plastic structure | |
| US20050042401A1 (en) | Plastic container | |
| JP2904797B2 (en) | Polymer molded body |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20050823 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20080602 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20080610 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20081111 |