JP2018021154A - Resin foam container and method for producing the same - Google Patents
Resin foam container and method for producing the same Download PDFInfo
- Publication number
- JP2018021154A JP2018021154A JP2016154554A JP2016154554A JP2018021154A JP 2018021154 A JP2018021154 A JP 2018021154A JP 2016154554 A JP2016154554 A JP 2016154554A JP 2016154554 A JP2016154554 A JP 2016154554A JP 2018021154 A JP2018021154 A JP 2018021154A
- Authority
- JP
- Japan
- Prior art keywords
- foamed resin
- resin container
- heat
- foamed
- crystallization
- 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.)
- Granted
Links
- 229920005989 resin Polymers 0.000 title claims abstract description 99
- 239000011347 resin Substances 0.000 title claims abstract description 99
- 239000006260 foam Substances 0.000 title claims abstract description 36
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000002425 crystallisation Methods 0.000 claims abstract description 36
- 230000008025 crystallization Effects 0.000 claims abstract description 36
- 229920006230 thermoplastic polyester resin Polymers 0.000 claims abstract description 24
- 230000004927 fusion Effects 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 16
- 238000000465 moulding Methods 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 7
- 235000013305 food Nutrition 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 239000010410 layer Substances 0.000 description 15
- 230000003014 reinforcing effect Effects 0.000 description 15
- 238000001938 differential scanning calorimetry curve Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 8
- 238000001878 scanning electron micrograph Methods 0.000 description 8
- 239000004088 foaming agent Substances 0.000 description 7
- 229920001225 polyester resin Polymers 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000001125 extrusion Methods 0.000 description 6
- 239000004645 polyester resin Substances 0.000 description 6
- 229920000139 polyethylene terephthalate Polymers 0.000 description 6
- 239000005020 polyethylene terephthalate Substances 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 5
- 238000005187 foaming Methods 0.000 description 5
- -1 polyethylene terephthalate Polymers 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000013518 molded foam Substances 0.000 description 3
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000012935 Averaging Methods 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000001273 butane Substances 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- NNPPMTNAJDCUHE-UHFFFAOYSA-N isobutane Chemical compound CC(C)C NNPPMTNAJDCUHE-UHFFFAOYSA-N 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000011342 resin composition Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000007666 vacuum forming Methods 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 239000004604 Blowing Agent Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 235000012489 doughnuts Nutrition 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 239000001282 iso-butane Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 239000012925 reference material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Containers Having Bodies Formed In One Piece (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
Description
本発明は、発泡樹脂容器及びその製造方法に関する。 The present invention relates to a foamed resin container and a method for producing the same.
従来から、断熱性を有する発泡樹脂容器が使用されている。なかでも熱可塑性ポリエステル系樹脂発泡シートを成形してなる発泡樹脂容器は、耐熱性に優れることで知られている。このため、熱可塑性ポリエステル系樹脂発泡シートを成形してなる発泡樹脂容器は、オーブンで加熱調理する食品の容器に使用されている。 Conventionally, a foamed resin container having heat insulating properties has been used. Among them, a foamed resin container formed by molding a thermoplastic polyester resin foam sheet is known to have excellent heat resistance. For this reason, a foamed resin container formed by molding a thermoplastic polyester resin foamed sheet is used as a container for food that is cooked in an oven.
このような発泡樹脂容器を得ることのできる熱可塑性ポリエステル系樹脂発泡シートとして、特許文献１には、熱可塑性ポリエステル系樹脂に対する気体透過率が特定の範囲である気体を発泡剤として含有する樹脂を使用した、熱可塑性ポリエステル系樹脂発泡シートが提案されている。 As a thermoplastic polyester resin foam sheet capable of obtaining such a foamed resin container, Patent Document 1 discloses a resin containing a gas whose gas permeability with respect to the thermoplastic polyester resin is in a specific range as a foaming agent. A used thermoplastic polyester resin foam sheet has been proposed.
しかしながら、特許文献１の発泡シートによる発泡樹脂容器は耐熱性に優れるが、冷凍保存等の低温条件下で割れやすくなる（低温脆性に劣る）という問題がある。 However, although the foamed resin container of the foamed sheet of Patent Document 1 is excellent in heat resistance, there is a problem that it is easily broken (inferior in low temperature brittleness) under low temperature conditions such as frozen storage.
そこで、本発明は、上記事情に鑑みてなされたものであり、耐熱性に優れ、且つ低温脆性に優れる発泡樹脂容器及びその製造方法を提供することを課題とする。 Then, this invention is made | formed in view of the said situation, and makes it a subject to provide the foamed resin container which is excellent in heat resistance, and excellent in low temperature brittleness, and its manufacturing method.
本発明は以下の態様を有する。
［１］熱可塑性ポリエステル系樹脂の発泡層を含む発泡樹脂容器であって、
結晶化熱量の絶対値が１〜５ｍＪ／ｍｇであり、
下記式（Ｉ）で算出される結晶化度が２０％以上である、発泡樹脂容器。
結晶化度（％）＝｛（融解熱量の絶対値（Ｊ／ｇ）−結晶化熱量の絶対値（Ｊ／ｇ））÷完全結晶化熱量（Ｊ／ｇ）｝×１００・・・（Ｉ）
［２］前記発泡層の厚み方向の気泡数が、１０〜２５個である［１］に記載の発泡樹脂容器。
［３］加熱調理する食品に用いられる［１］又は［２］に記載の発泡樹脂容器。
［４］［１］〜［３］のいずれか一項に記載の発泡樹脂容器の製造方法であって、
熱可塑性ポリエステル系樹脂発泡層を含む発泡シートを１２０〜１８０℃で加熱する加熱工程、及び
前記加熱工程後、加熱した前記発泡シートを１６０〜２００℃の金型で挟み４〜１５秒間加熱成形する成形工程、を含む発泡樹脂容器の製造方法。
［５］前記成形工程後、成形した前記発泡シートを表面温度が５０〜７０℃になるまで放冷する放冷工程を含む、［４］に記載の発泡樹脂容器の製造方法。
The present invention has the following aspects.
[1] A foamed resin container including a foamed layer of thermoplastic polyester resin,
The absolute value of the amount of crystallization heat is 1 to 5 mJ / mg,
A foamed resin container having a crystallinity calculated by the following formula (I) of 20% or more.
Crystallinity (%) = {(absolute value of heat of fusion (J / g) −absolute value of heat of crystallization (J / g)) ÷ complete heat of crystallization (J / g)} × 100 (I )
[2] The foamed resin container according to [1], wherein the foam layer has 10 to 25 bubbles in the thickness direction.
[3] The foamed resin container according to [1] or [2] used for food to be cooked.
[4] A method for producing a foamed resin container according to any one of [1] to [3],
A heating step of heating a foamed sheet including a thermoplastic polyester resin foam layer at 120 to 180 ° C, and after the heating step, the heated foamed sheet is sandwiched between 160 to 200 ° C molds and heat molded for 4 to 15 seconds. A method for producing a foamed resin container, comprising a molding step.
[5] The method for producing a foamed resin container according to [4], including a cooling step of cooling the molded foam sheet until the surface temperature reaches 50 to 70 ° C. after the molding step.
本発明によれば、耐熱性に優れ、且つ低温脆性に優れる発泡樹脂容器及びその製造方法を提供することができる。 According to the present invention, it is possible to provide a foamed resin container excellent in heat resistance and excellent in low-temperature brittleness and a method for producing the same.
本発明の発泡樹脂容器は、熱可塑性ポリエステル系樹脂発泡シートが加熱成形されてなるものである。 The foamed resin container of the present invention is obtained by thermoforming a thermoplastic polyester resin foam sheet.
（熱可塑性ポリエステル系樹脂発泡シート）
本発明において熱可塑性ポリエステル系樹脂発泡シート（以下単に「発泡シート」ともいう。）は、ポリエステル系樹脂を含有する樹脂組成物の発泡樹脂層を備えるものである。該発泡樹脂層は、ポリエステル系樹脂を含む樹脂、及び発泡剤等を含む樹脂組成物から形成される。
かかる発泡シートは、発泡樹脂層のみからなる単層構造であってもよいし、発泡樹脂層の少なくとも一方の面に非発泡樹脂層等が設けられた積層構造であってもよい。
(Thermoplastic polyester resin foam sheet)
In the present invention, a thermoplastic polyester resin foam sheet (hereinafter also simply referred to as “foam sheet”) includes a foam resin layer of a resin composition containing a polyester resin. The foamed resin layer is formed from a resin composition containing a polyester resin and a foaming agent.
Such a foamed sheet may have a single-layer structure composed only of a foamed resin layer, or may have a laminated structure in which a non-foamed resin layer or the like is provided on at least one surface of the foamed resin layer.
＜樹脂＞
樹脂はポリエステル系樹脂を含む。ポリエステル系樹脂としては、ポリエチレンテレフタレート（ＰＥＴ）、ポリブチレンテレフタレート、ポリエチレンナフタレート等が挙げられる。これらのポリエステル系樹脂は、１種単独で用いられてもよいし、２種以上が組み合わされて用いられてもよい。
ＩＶ値は０．５〜１．５０が好ましく、０．９０〜１．１０がより好ましい。
好ましい理由は、ＩＶ値が０．５未満の場合には発泡しにくくなり押出発泡シートが得られにくくなり、ＩＶ値が１．５０超になると平滑なシートが得られにくくなる。
ＩＶ値は、ＪＩＳ Ｋ ７３６７−５（２０００）の方法で測定できる。
<Resin>
The resin includes a polyester resin. Examples of the polyester resin include polyethylene terephthalate (PET), polybutylene terephthalate, and polyethylene naphthalate. These polyester resins may be used alone or in combination of two or more.
The IV value is preferably 0.5 to 1.50, more preferably 0.90 to 1.10.
A preferable reason is that when the IV value is less than 0.5, foaming is difficult and an extruded foam sheet is hardly obtained, and when the IV value exceeds 1.50, a smooth sheet is hardly obtained.
The IV value can be measured by the method of JIS K 7367-5 (2000).
＜発泡剤＞
発泡剤としては、プロパン、ブタン、ペンタン等の炭化水素が挙げられる。中でも、ブタンが好ましく、ノルマルブタンとイソブタンとの混合物が好ましい。これらの発泡剤は、１種単独で用いられてもよいし、２種以上が組み合わされて用いられてもよい。
さらに、強度及び断熱性を向上させるために気泡の調整が容易な窒素、炭酸ガスを用いてもよい。
<Foaming agent>
Examples of the blowing agent include hydrocarbons such as propane, butane, and pentane. Of these, butane is preferable, and a mixture of normal butane and isobutane is preferable. These foaming agents may be used individually by 1 type, and may be used in combination of 2 or more type.
Furthermore, in order to improve strength and heat insulation, nitrogen or carbon dioxide gas, which can easily adjust bubbles, may be used.
＜任意成分＞
本発明の発泡シートは、その他成分（任意成分）を含有していてもよい。
かかる任意成分としては、気泡調整剤、界面活性剤、着色剤、収縮防止剤、難燃剤、滑剤、劣化防止剤などが挙げられる。
気泡調整剤としては、タルク、四フッ化エチレン樹脂等が挙げられる。
<Optional component>
The foamed sheet of the present invention may contain other components (optional components).
Examples of such optional components include a bubble regulator, a surfactant, a colorant, a shrinkage inhibitor, a flame retardant, a lubricant, and a deterioration inhibitor.
Examples of the air conditioner include talc and tetrafluoroethylene resin.
（熱可塑性ポリエステル系樹脂発泡シートの製造方法）
熱可塑性ポリエステル系樹脂発泡シートの製造方法は、ポリエステル系樹脂を含有する原料組成物と、発泡剤と、を溶融混練した溶融混合物を、押出発泡させる方法である。
かかる熱可塑性ポリエステル系樹脂発泡シートの好適な製造方法としては、公知の発泡シートの製造方法を採用することができ、例えば、以下に示す製造方法が挙げられる。
(Method for producing thermoplastic polyester resin foam sheet)
The method for producing a thermoplastic polyester resin foam sheet is a method in which a molten mixture obtained by melting and kneading a raw material composition containing a polyester resin and a foaming agent is extruded and foamed.
As a suitable method for producing such a thermoplastic polyester resin foam sheet, a known foam sheet production method can be employed, and examples thereof include the following production methods.
ポリエステル系樹脂を含む樹脂並びにその他成分を含有する原料組成物と、発泡剤と、を押出機に供給して溶融混練する。続いて、前記押出機の先端に取り付けたサーキュラーダイから押出発泡して円筒状の発泡体を得る。この円筒状の発泡体を、拡径させた上でマンドレルに供給して冷却する。冷却された円筒状の発泡体をその内外周面間に亘って押出方向に連続的に切断して展開することにより、熱可塑性ポリエステル系樹脂発泡シートを製造する方法が挙げられる。 A raw material composition containing a polyester-based resin and other components and a foaming agent are supplied to an extruder and melt-kneaded. Subsequently, a cylindrical foam is obtained by extrusion foaming from a circular die attached to the tip of the extruder. The cylindrical foam is expanded and then supplied to a mandrel to be cooled. A method of producing a thermoplastic polyester resin foam sheet by continuously cutting and expanding a cooled cylindrical foam in the extrusion direction across the inner and outer peripheral surfaces thereof can be mentioned.
（発泡樹脂容器）
本発明の発泡樹脂容器（以下単に「容器」ともいう。）は、上記熱可塑性ポリエステル系樹脂発泡シートを、公知の成形方法等を用いて、所望の形状に成形してなるものである。たとえば、熱可塑性ポリエステル系樹脂発泡シートは、押出発泡法を用いて製造された厚み０．５〜５．０ｍｍ、発泡倍率２〜６倍、結晶化度１３％以下のものを用いる。また、熱可塑性ポリエステル系樹脂発泡シートは、非発泡樹脂層等が設けられた積層構造であってもよく、非発泡樹脂層としては、上述のポリエステル、ポリオレフィン、ポリスチレン等の樹脂を含むことが好ましい。積層構造にすることにより、さらに強度を上げ、美麗性も得ることができる。
(Foamed resin container)
The foamed resin container of the present invention (hereinafter also simply referred to as “container”) is formed by molding the thermoplastic polyester resin foam sheet into a desired shape using a known molding method or the like. For example, as the thermoplastic polyester resin foam sheet, a sheet having a thickness of 0.5 to 5.0 mm, an expansion ratio of 2 to 6 times, and a crystallinity of 13% or less manufactured by an extrusion foaming method is used. Further, the thermoplastic polyester resin foam sheet may have a laminated structure provided with a non-foamed resin layer and the like, and the non-foamed resin layer preferably contains the above-described resins such as polyester, polyolefin and polystyrene. . By using a laminated structure, the strength can be further increased and beauty can be obtained.
図１は本発明の発泡樹脂容器の一実施形態を示す平面図である。
図１に示すように、本発明の発泡樹脂容器２０は、平面視で楕円形の底壁１と、底壁１の周縁から立ち上がり、底壁１を囲む略円筒状の側壁２とを有し、側壁２の上端で囲まれた開口部７が形成された容器本体８を備えるものであることが好ましい。側壁２は開口部７から底壁１に向かうに従い窄まっている。開口部７は平面視において、Ｘ２方向を長手、Ｙ２方向を短手とする楕円形である。
本実施形態では、側壁２の上端に、開口部７の外方に張り出すフランジ部３を有する。フランジ部３は開口部７を周回しており、長手方向Ｘ２の両側に張り出したつまみ部３Ａが形成されている。
また、底壁１の中央に平面視で十字状の底壁補強部２４Ａ、２４Ｂを有する。側壁２に断面形状が波状の側壁補強部５を有する。
なお、本実施形態の開口部７は、平面視で楕円形であるが、本発明はこれに限定されない。開口部７の平面視形状は、正円でもよいし多角形でもよい。
FIG. 1 is a plan view showing an embodiment of the foamed resin container of the present invention.
As shown in FIG. 1, the foamed resin container 20 of the present invention has an elliptical bottom wall 1 in plan view and a substantially cylindrical side wall 2 that rises from the periphery of the bottom wall 1 and surrounds the bottom wall 1. The container body 8 is preferably provided with an opening 7 surrounded by the upper end of the side wall 2. The side wall 2 is narrowed from the opening 7 toward the bottom wall 1. The opening 7 has an elliptical shape with the X2 direction as the long side and the Y2 direction as the short side in plan view.
In the present embodiment, the upper end of the side wall 2 has a flange portion 3 that projects outward from the opening 7. The flange portion 3 circulates around the opening portion 7, and is formed with a knob portion 3A projecting on both sides in the longitudinal direction X2.
Further, the bottom wall 1 has cross-shaped bottom wall reinforcing portions 24A and 24B in a plan view in the center. The side wall 2 has a side wall reinforcing portion 5 having a wavy cross section.
In addition, although the opening part 7 of this embodiment is elliptical by planar view, this invention is not limited to this. The planar view shape of the opening 7 may be a perfect circle or a polygon.
本実施態様の発泡樹脂容器２０は、長手方向の長さＬ２が１９０〜２３０ｍｍであり、短手方向の長さＷ２が１２０〜１５０ｍｍであり、高さＨ２が２５〜４５ｍｍであることが好ましい。 The foamed resin container 20 of this embodiment preferably has a length L2 in the longitudinal direction of 190 to 230 mm, a length W2 in the short direction of 120 to 150 mm, and a height H2 of 25 to 45 mm.
発泡樹脂容器２０の高さＨ２と開口部７の開口面積を正円に換算したときの直径との比は、［発泡樹脂容器２０の高さ］／［開口部７の開口面積を正円に換算したときの直径］で表して０．０５〜０．４０が好ましく、０．１０〜０．３０がより好ましい。
上記数値範囲とすることにより、耐熱性に優れた発泡樹脂容器とすることができる。
ここで開口部７の開口面積は、画像解析により測定することができる。
The ratio between the height H2 of the foamed resin container 20 and the diameter when the opening area of the opening 7 is converted into a perfect circle is [height of the foamed resin container 20] / [open area of the opening 7 is a perfect circle. 0.05 to 0.40 is preferable, and 0.10 to 0.30 is more preferable.
By setting it as the said numerical range, it can be set as the foamed resin container excellent in heat resistance.
Here, the opening area of the opening 7 can be measured by image analysis.
底壁１の平均厚みと側壁２の平均厚みとの比は、［底壁１の平均厚み］／［側壁２の平均厚み］で表して０．６０〜２．１０が好ましく、０．８０〜１．９０がより好ましい。
上記数値範囲とすることにより、耐熱性に優れた発泡樹脂容器とすることができる。
底壁１の平均厚みとは、発泡樹脂容器の重心近傍（重心から３０ｍｍ以内の領域）において、任意の３箇所の厚みを測定し、その平均値を測定した値である。
側壁２の平均厚みとは、側壁２を高さ方向に３等分し、それぞれの中央部分で厚みを測定し、平均した値である。
なお、本明細書において厚みとは、マイクロゲージを用いて測定される。
The ratio of the average thickness of the bottom wall 1 to the average thickness of the side wall 2 is preferably expressed as [average thickness of the bottom wall 1] / [average thickness of the side wall 2], and is preferably 0.60 to 2.10, and is preferably 0.80. 1.90 is more preferable.
By setting it as the said numerical range, it can be set as the foamed resin container excellent in heat resistance.
The average thickness of the bottom wall 1 is a value obtained by measuring the thickness of three arbitrary locations in the vicinity of the center of gravity of the foamed resin container (region within 30 mm from the center of gravity) and measuring the average value.
The average thickness of the side wall 2 is a value obtained by dividing the side wall 2 into three equal parts in the height direction, measuring the thickness at each central portion, and averaging the results.
In the present specification, the thickness is measured using a micro gauge.
図２に示すように、底壁１と側壁２との間のコーナー部６は、断面形状が円弧状であることが好ましい。
コーナー部６の平均厚みと側壁２の平均厚みとの比は、［コーナー部６の平均厚み］／［側壁２の平均厚み］で表して０．４０〜１．４０が好ましく、０．２０〜０．５５がより好ましい。
コーナー部６の平均厚みは、コーナー部６を高さ方向に３等分し、それぞれの中央部分で厚みを測定し、平均した値である。
As shown in FIG. 2, the corner portion 6 between the bottom wall 1 and the side wall 2 preferably has an arc shape in cross section.
The ratio of the average thickness of the corner portion 6 to the average thickness of the side wall 2 is preferably expressed as [average thickness of the corner portion 6] / [average thickness of the side wall 2], and is preferably 0.40 to 1.40, and is preferably 0.20. 0.55 is more preferable.
The average thickness of the corner portion 6 is a value obtained by dividing the corner portion 6 into three equal parts in the height direction, measuring the thickness at each central portion, and averaging.
図２は図１の発泡樹脂容器のＡ−Ａ断面図である。
底壁補強部２４Ａから底壁１までの高さｈ２は４〜７ｍｍが好ましい。
底壁補強部２４Ａから底壁１までの高さｈ２と発泡樹脂容器２０の高さＨ２との比は、［底壁補強部２４Ａから底壁１までの高さｈ２］／［発泡樹脂容器２０の高さＨ２］で表して、０．０５〜０．３５が好ましく、０．１０〜０．３０が好ましい。
底壁補強部２４Ａ及び２４Ｂの平面視の面積と底壁１の平面視の面積との比は、［底壁補強部２４Ａ及び２４Ｂの平面視の面積］／［底壁１の平面視の面積］で表して、０．０５〜０．５５が好ましく、０．１０〜０．４５がより好ましい。
底壁補強部２４Ａ、２４Ｂは、図１に示すように平面視で、長手方向Ｘ２に伸びる底壁補強部２４Ａと、短手方向Ｙ２に伸びる底壁補強部２４Ｂとが発泡樹脂容器中央で交差する十字状であってもよい。あるいは底壁の中央から外側に伸びる放射線状であってもよいし、ドーナツ状であってもよいし、円形であってもよいし、多角形であってもよい。底壁補強部２４Ａ、２４Ｂの断面は、凹状であってもよく凸状であってもよい。底壁に凹状または凸状の底壁補強部が底壁の中央部を通るように形成されていることにより、発泡樹脂容器を加熱した時に底壁の歪な変形を防ぐことができる。すなわち、発泡樹脂容器に入れる内容物がグラタン、ラザニア等比較的重量のあるものであっても、片手で発泡樹脂容器を持ちあげることができるので取り扱いやすい。また、発泡樹脂容器を載置したときにも底壁の平坦性を保持することで安定性が良い。さらに、グラタンなどの粘度の高い食品であれば底壁を滑り、発泡樹脂容器から内容物がこぼれ落ちることを防止することができる。凸状である場合、底壁補強部２４Ａ、２４Ｂの断面形状は開口面側に向かって窄まる台形が好ましい。
2 is a cross-sectional view taken along the line AA of the foamed resin container of FIG.
The height h2 from the bottom wall reinforcing portion 24A to the bottom wall 1 is preferably 4 to 7 mm.
The ratio of the height h2 from the bottom wall reinforcing portion 24A to the bottom wall 1 and the height H2 of the foamed resin container 20 is [height h2 from the bottom wall reinforcing portion 24A to the bottom wall 1] / [foamed resin container 20]. The height H2] is preferably 0.05 to 0.35, more preferably 0.10 to 0.30.
The ratio of the area in plan view of the bottom wall reinforcing portions 24A and 24B to the area in plan view of the bottom wall 1 is [area of the bottom wall reinforcing portions 24A and 24B in plan view] / [area in plan view of the bottom wall 1]. ], 0.05 to 0.55 is preferable, and 0.10 to 0.45 is more preferable.
As shown in FIG. 1, the bottom wall reinforcing portions 24A and 24B are planarly viewed, and the bottom wall reinforcing portion 24A extending in the longitudinal direction X2 and the bottom wall reinforcing portion 24B extending in the short direction Y2 intersect at the center of the foamed resin container. It may be a cross shape. Alternatively, it may be a radial shape extending outward from the center of the bottom wall, may be a donut shape, may be a circle, or may be a polygon. The cross sections of the bottom wall reinforcing portions 24A and 24B may be concave or convex. By forming the concave or convex bottom wall reinforcing portion on the bottom wall so as to pass through the center portion of the bottom wall, it is possible to prevent distortion of the bottom wall when the foamed resin container is heated. That is, even if the contents put in the foamed resin container are relatively heavy, such as gratin or lasagna, the foamed resin container can be lifted with one hand, so that it is easy to handle. Moreover, stability is good by maintaining the flatness of the bottom wall even when the foamed resin container is placed. Furthermore, if the food has a high viscosity such as gratin, the bottom wall can be slid to prevent the contents from spilling out of the foamed resin container. When it is convex, the cross-sectional shape of the bottom wall reinforcing portions 24A and 24B is preferably a trapezoid that narrows toward the opening surface.
側壁補強部５は、図１のように連続して形成されていてもよく、分断して形成されていてもよい。側壁補強部５の断面は、波状であることが好ましい。 The side wall reinforcing portion 5 may be formed continuously as shown in FIG. 1 or may be divided and formed. The cross section of the side wall reinforcing portion 5 is preferably wavy.
フランジ部３の平面視の面積と発泡樹脂容器２０全体の平面視の面積との比は、［フランジ部３の平面視の面積］／［発泡樹脂容器２０全体の平面視の面積］で表して、０．０５〜０．４５が好ましく、０．１０〜０．３５がより好ましい。
上記数値範囲とすることにより、耐熱性に優れた発泡樹脂容器とすることができる。
フランジ部３の外縁の形状は特に限定されないが、平面視で楕円形であってもよく、楕円形の長手方向の端部を面取りされた形状であってもよい。
フランジ部３の平均厚みと側壁２の平均厚みとの比は、［フランジ部３の平均厚み］／［側壁２の平均厚み］で表して、０．６〜１．６５が好ましく、０．７５〜１．５０がより好ましい。
フランジ部３の平均厚みは、フランジ部３の任意の５箇所の厚みを測定し、平均値を算出することで得られる。
The ratio of the area in plan view of the flange portion 3 to the area in plan view of the entire foamed resin container 20 is expressed by [area in plan view of the flange portion 3] / [area in plan view of the foamed resin container 20]. 0.05 to 0.45 is preferable, and 0.10 to 0.35 is more preferable.
By setting it as the said numerical range, it can be set as the foamed resin container excellent in heat resistance.
The shape of the outer edge of the flange portion 3 is not particularly limited, but may be an ellipse in plan view, or may be a shape in which the end of the ellipse in the longitudinal direction is chamfered.
The ratio of the average thickness of the flange portion 3 to the average thickness of the side wall 2 is preferably expressed as [Average thickness of the flange portion 3] / [Average thickness of the side wall 2], and is preferably 0.6 to 1.65, 0.75. -1.50 is more preferable.
The average thickness of the flange portion 3 is obtained by measuring the thickness of any five locations of the flange portion 3 and calculating the average value.
発泡層の厚み方向の気泡数は、１０〜２５個が好ましい。
底壁の厚み方向の気泡数は、１０〜２５個が好ましい。
側壁の厚み方向の気泡数は、１０〜２５個が好ましい。
気泡数が上記数値範囲内であると、発泡樹脂容器の強度を向上しやすくなり、断熱性を向上しやすくなる。
厚み方向の気泡数とは、底壁又は側壁を厚み方向に切り取り、切り取った断面に厚み方向に沿って線を描き、走査電子顕微鏡（ＳＥＭ）で観察し、線に重なる気泡数をカウントしたものである。
例えば底壁の場合には、図３に示すように中央部分をサンプルとして採取し、ＭＤ方向（押出方向）に沿った面（ＭＤ面）、及びＴＤ方向（押出方向と直交する方向）に沿った面（ＴＤ面）を走査電子顕微鏡（ＳＥＭ）で観察できる大きさにカットする。これらＭＤ面、及びＴＤ面についてＳＥＭを用いて写真を撮影する。倍率は５０〜２００倍で撮影する。図４は底壁中央部分のＭＤ面のＳＥＭ画像であり、図５は底壁中央部分のＴＤ面のＳＥＭ画像である。写真において底壁の厚み方向に直線を引き、直線上に接触するか交差する気泡数をそれぞれカウントする。ＭＤ面、ＴＤ面で得られた気泡数の値から平均値として算出したものを底壁の厚み方向の気泡数とする。
側壁の場合には、容器を長手方向に沿って切断した時の断面をＭＤ面とし、容器を短手方向に沿って切断した時の断面をＴＤ面とし、上記と同様にＳＥＭを用いて写真を撮影する。倍率は５０〜２００倍で撮影する。図６が側壁のＭＤ面のＳＥＭ画像であり、図７が側壁のＴＤ面のＳＥＭ画像である。写真において側壁の厚み方向に直線を引き、直線上に接触するか交差する気泡数をそれぞれカウントする。ＭＤ面、ＴＤ面で得られた気泡数の値から平均値として算出したものを側壁の厚み方向の気泡数とする。
The number of cells in the thickness direction of the foam layer is preferably 10 to 25.
The number of bubbles in the thickness direction of the bottom wall is preferably 10-25.
The number of bubbles in the thickness direction of the side wall is preferably 10 to 25.
It becomes easy to improve the intensity | strength of a foamed resin container as the number of bubbles is in the said numerical range, and it becomes easy to improve heat insulation.
The number of bubbles in the thickness direction is the bottom wall or side wall cut in the thickness direction, a line is drawn along the thickness direction on the cut section, observed with a scanning electron microscope (SEM), and the number of bubbles overlapping the line is counted It is.
For example, in the case of the bottom wall, as shown in FIG. 3, the central portion is taken as a sample, and along the surface (MD surface) along the MD direction (extrusion direction) and along the TD direction (direction orthogonal to the extrusion direction). The cut surface (TD surface) is cut to a size that can be observed with a scanning electron microscope (SEM). These MD surface and TD surface are photographed using SEM. Shoot at a magnification of 50 to 200 times. 4 is an SEM image of the MD surface of the center portion of the bottom wall, and FIG. 5 is an SEM image of the TD surface of the center portion of the bottom wall. In the photograph, a straight line is drawn in the thickness direction of the bottom wall, and the number of bubbles that touch or cross each other is counted. An average value calculated from the value of the number of bubbles obtained on the MD surface and the TD surface is defined as the number of bubbles in the thickness direction of the bottom wall.
In the case of a side wall, the cross section when the container is cut along the longitudinal direction is the MD surface, and the cross section when the container is cut along the short direction is the TD surface, and a photograph is taken using the SEM in the same manner as above. Shoot. Shoot at a magnification of 50 to 200 times. 6 is an SEM image of the MD surface of the side wall, and FIG. 7 is an SEM image of the TD surface of the side wall. In the photograph, a straight line is drawn in the thickness direction of the side wall, and the number of bubbles that touch or cross each other is counted. The average value calculated from the value of the number of bubbles obtained on the MD surface and the TD surface is defined as the number of bubbles in the thickness direction of the side wall.
本発明の発泡樹脂容器において、樹脂の結晶化熱量の絶対値は、１〜５ｍＪ／ｍｇであり、２〜３ｍＪ／ｍｇがより好ましい。
結晶化熱量の絶対値を上記範囲とすることにより、低温脆性を向上しやすくなる。
結晶化熱量は発泡シートの成形条件によって調節することができる。
結晶化熱量は、ＪＩＳ Ｋ７１２２：２０１２「プラスチックの転移熱測定方法」に従い測定したＤＳＣ曲線から求めることができる。
具体的には、熱差走査熱量計装置（ＤＳＣ６２２０型、ＳＩＩナノテクノロジー株式会社製）を用いアルミニウム製測定容器の底に隙間のないように試料を約６ｍｇ充填する。次に窒素ガス流量２０ｍＬ／ｍｉｎのもと３０℃で２分間保持し、速度１０℃／ｍｉｎで３０℃から２９０℃まで昇温した時のＤＳＣ曲線を得る。このときの基準物質としてアルミナを用いる。
In the foamed resin container of the present invention, the absolute value of the crystallization heat quantity of the resin is 1 to 5 mJ / mg, and more preferably 2 to 3 mJ / mg.
By setting the absolute value of the heat of crystallization within the above range, low temperature brittleness can be easily improved.
The amount of crystallization heat can be adjusted by the molding conditions of the foam sheet.
The amount of crystallization heat can be determined from a DSC curve measured according to JIS K7122: 2012 “Method of measuring the transition heat of plastic”.
Specifically, about 6 mg of the sample is filled using a thermal difference scanning calorimeter (DSC 6220 type, manufactured by SII Nano Technology Co., Ltd.) so that there is no gap at the bottom of the aluminum measurement container. Next, a DSC curve is obtained when the temperature is maintained at 30 ° C. for 2 minutes under a nitrogen gas flow rate of 20 mL / min and the temperature is increased from 30 ° C. to 290 ° C. at a rate of 10 ° C./min. Alumina is used as a reference material at this time.
本発明の発泡樹脂容器において、下記式（Ｉ）で算出される結晶化度が２０％以上であり、３０％以上がより好ましい。上限値は、３０％以下が好ましく、２７％以下がより好ましい。
結晶化度（％）＝｛（融解熱量の絶対値（Ｊ／ｇ）−結晶化熱量の絶対値（Ｊ／ｇ））÷完全結晶化熱量（Ｊ／ｇ）｝×１００・・・（Ｉ）
結晶化度を上記範囲とすることにより、発泡樹脂容器の耐熱性が向上しやすくなる。
ここで、融解熱量、結晶化熱量はＪＩＳ Ｋ７１２２：２０１２「プラスチックの転移熱測定方法」に従い測定したＤＳＣ曲線から求めることができる。測定条件は上述の通りである。
本発明において算出される結晶化度とは、融熱ピークの面積から求められる融解熱量（Ｊ／ｇ）と結晶化ピークの面積から求められる結晶化熱量（Ｊ／ｇ）の差を、樹脂の完全結晶の理論融解熱量で除して求められる値である。融解熱量及び結晶化熱量は、装置付属の解析ソフトを用いて算出することができる。図８は、ＤＳＣ曲線から融解熱量と結晶化熱量の算出方法を説明するためのＤＣＳ曲線の模式図である。図８において、融解熱量は、融熱ピークとベースラインとで囲まれる面積（図８における右側斜線部分）から算出され、結晶化熱量は、結晶化ピークとベースラインとで囲まれる面積（図８における左側斜線部分）から算出される。
図９は、ＰＥＴを使用した時のＤＳＣ曲線を表す図である。図９において、１１０〜１４０℃の間のピークが結晶化熱量を表し、２１０〜２６０℃の間のピークが融解熱量を表す。完全結晶化熱量は、１００％結晶化した場合の熱量を表す。なお、ＰＥＴの完全結晶化熱量は、１４０．１Ｊ／ｇである。
発泡樹脂容器の結晶化度は発泡シートの成形条件によって調節することができる。
In the foamed resin container of the present invention, the crystallinity calculated by the following formula (I) is 20% or more, and more preferably 30% or more. The upper limit is preferably 30% or less, and more preferably 27% or less.
Crystallinity (%) = {(absolute value of heat of fusion (J / g) −absolute value of heat of crystallization (J / g)) ÷ complete heat of crystallization (J / g)} × 100 (I )
By setting the crystallinity within the above range, the heat resistance of the foamed resin container is easily improved.
Here, the heat of fusion and the heat of crystallization can be determined from the DSC curve measured according to JIS K7122: 2012 “Method for measuring the transition heat of plastic”. The measurement conditions are as described above.
The crystallinity calculated in the present invention is the difference between the heat of fusion (J / g) determined from the area of the heat fusion peak and the heat of crystallization (J / g) determined from the area of the crystallization peak. It is a value obtained by dividing by the theoretical heat of fusion of a complete crystal. The heat of fusion and the heat of crystallization can be calculated using analysis software attached to the apparatus. FIG. 8 is a schematic diagram of a DCS curve for explaining a method of calculating the heat of fusion and the heat of crystallization from the DSC curve. In FIG. 8, the heat of fusion is calculated from the area surrounded by the heat melting peak and the base line (the right hatched portion in FIG. 8), and the heat of crystallization is the area surrounded by the crystallization peak and the base line (FIG. 8). (Left hatched portion) in FIG.
FIG. 9 is a diagram showing a DSC curve when PET is used. In FIG. 9, the peak between 110-140 ° C. represents the crystallization heat amount, and the peak between 210-260 ° C. represents the heat of fusion. The complete crystallization heat amount represents the heat amount when 100% crystallization occurs. The complete crystallization heat amount of PET is 140.1 J / g.
The crystallinity of the foamed resin container can be adjusted by the molding conditions of the foamed sheet.
（発泡樹脂容器の製造方法）
本発明の発泡樹脂容器は、熱可塑性ポリエステル系樹脂発泡シート（以下「発泡シート」という）を１２０〜１８０℃で加熱する加熱工程、及び前記加熱工程後、引き続き前記発泡シートを１６０〜２００℃の金型で挟み４〜１５秒間加熱成形する成形工程、を含む製造方法で製造することができる。さらに、前記成形工程後、成形された前記発泡シートを５０〜７０℃になるまで放冷する放冷工程を含んでいてもよい。
(Method for producing foamed resin container)
The foamed resin container of the present invention comprises a heating step of heating a thermoplastic polyester resin foamed sheet (hereinafter referred to as “foamed sheet”) at 120 to 180 ° C., and after the heating step, the foamed sheet is continuously heated to 160 to 200 ° C. It can be manufactured by a manufacturing method including a molding step of sandwiching between molds and performing heat molding for 4 to 15 seconds. Furthermore, after the said shaping | molding process, the cooling process which cools until the said foamed sheet | seat shape | molded becomes 50-70 degreeC may be included.
＜加熱工程＞
加熱工程では、発泡シートを１２０〜１８０℃のヒーター槽で加熱して発泡シートを軟らかくする。
このとき発泡シートの表面温度を１０５〜１３５℃にすることが好ましい。
加熱工程における発泡シートの加熱時間は、２０〜６０秒が好ましい。
<Heating process>
In the heating step, the foamed sheet is softened by heating the foamed sheet in a heater tank at 120 to 180 ° C.
At this time, the surface temperature of the foamed sheet is preferably set to 105 to 135 ° C.
The heating time of the foam sheet in the heating step is preferably 20 to 60 seconds.
＜成形工程＞
成形工程では、加熱工程後、加熱した発泡シートを１６０〜２００℃の金型で挟み４〜１５秒間加熱成形する。
１６０〜２００℃の金型で挟み４〜１５秒間加熱することにより樹脂の結晶化が進み、樹脂の結晶化熱量の絶対値を１〜５ｍＪ／ｍｇとし、且つ結晶化度を２０％以上とすることができる。
成形方法としては、例えば、真空成形又は圧空成形が挙げられる。真空成形又は圧空成形としては、プラグ成形、フリードローイング成形、プラグ・アンド・リッジ成形、マッチド・モールド成形、ストレート成形、ドレープ成形、リバースドロー成形、エアスリップ成形、プラグアシスト成形、プラグアシストリバースドロー成形などが挙げられる。なかでも圧空成形が好ましい。圧空成形では、金型として１６０〜２００℃に加熱したプラグ型及びキャビ型を用い、プラグ型側から圧縮空気を供給して、加熱した熱可塑性ポリエステル系樹脂発泡シートをキャビ型に４〜１５秒間密着させることが好ましい。
成形工程における金型の温度は、加熱工程におけるヒーター槽の温度よりも高いことが好ましい。
<Molding process>
In the molding step, after the heating step, the heated foamed sheet is sandwiched between 160-200 ° C. molds and heat molded for 4-15 seconds.
The resin is crystallized by being sandwiched between 160-200 ° C. molds and heated for 4-15 seconds, the absolute value of the heat of crystallization of the resin is 1-5 mJ / mg, and the crystallinity is 20% or more. be able to.
Examples of the forming method include vacuum forming and pressure forming. As vacuum forming or pressure forming, plug forming, free drawing forming, plug and ridge forming, matched mold forming, straight forming, drape forming, reverse draw forming, air slip forming, plug assist forming, plug assist reverse drawing forming Etc. Of these, compressed air molding is preferred. In the pressure forming, a plug mold and a mold mold heated to 160 to 200 ° C. are used as molds, compressed air is supplied from the plug mold side, and the heated thermoplastic polyester resin foam sheet is applied to the mold mold for 4 to 15 seconds. It is preferable to adhere.
The mold temperature in the molding step is preferably higher than the temperature of the heater tank in the heating step.
＜放冷工程＞
放冷工程では、成形した発泡シートを表面温度が５０〜７０℃になるまで放冷する。
放冷工程では、成形した発泡シートを５０〜６０秒かけて、発泡シートの表面温度が５０〜７０℃になるまで放冷することが好ましい。放冷することにより、樹脂の結晶化が進み、結晶化度を２０％以上とすることができる。
<Cooling process>
In the cooling step, the molded foam sheet is allowed to cool until the surface temperature reaches 50 to 70 ° C.
In the cooling step, the molded foam sheet is preferably allowed to cool for 50 to 60 seconds until the surface temperature of the foam sheet reaches 50 to 70 ° C. By allowing to cool, the crystallization of the resin proceeds and the crystallinity can be increased to 20% or more.
本発明の発泡樹脂容器は、内表面に非発泡樹脂層を有していてもよい。非発泡樹脂層を有することにより、発泡樹脂容器の強度が向上し、熱によって変形しにくくなる。
また、２枚の非発泡樹脂層の間に印刷層を挟み、これを発泡樹脂容器の内表面に積層した構造としてもよい。このような構成とすることにより、発泡樹脂容器表面を着色及び装飾できるため、意匠性が向上する。
The foamed resin container of the present invention may have a non-foamed resin layer on the inner surface. By having a non-foamed resin layer, the strength of the foamed resin container is improved and it is difficult to be deformed by heat.
Moreover, it is good also as a structure which pinched | interposed the printing layer between the two non-foamed resin layers, and laminated | stacked this on the inner surface of the foamed resin container. By setting it as such a structure, since the foamed resin container surface can be colored and decorated, the designability improves.
本発明の発泡樹脂容器は、食品包装用容器等の容器として使用され、特に、オーブン及び電子レンジで加熱調理する食品用のものであることが好ましい。 The foamed resin container of the present invention is used as a container such as a food packaging container, and is particularly preferably for food that is cooked in an oven and a microwave oven.
以下、実施例によって本発明を詳細に説明するが、本発明は以下の記載によっては限定されない。
本実施例で用いた原料を以下に示す。
EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited by the following description.
The raw materials used in this example are shown below.
＜熱可塑性ポリエステル系樹脂発泡シート＞
ポリエチレンテレフタレート発泡シート（積水化成品工業株式会社製、ポリエチレンテレフタレートのＩＶ値：１．０、発泡剤：窒素、気泡調整剤：タルク粉末、押し出し発泡法で製造されたもの、シート重量：３３０ｇ／ｍ２、シート厚み：０．７５ｍｍ）。
<Thermoplastic polyester resin foam sheet>
Polyethylene terephthalate foam sheet (manufactured by Sekisui Plastics Co., Ltd., polyethylene terephthalate IV value: 1.0, foaming agent: nitrogen, bubble regulator: talc powder, manufactured by extrusion foaming method, sheet weight: 330 g / m 2 , sheet thickness: 0.75 mm).
（実施例１）
［発泡樹脂容器の製造］
図１に示す発泡樹脂容器であって、Ｌ２が２０５ｍｍ、Ｗ２が１３５ｍｍ、Ｈ２が３１ｍｍの発泡樹脂容器を製造した。
熱可塑性ポリエステル系樹脂発泡シートを９０秒間１５０℃のヒーター槽で加熱してシート表面温度を１２５℃にした後、プラグ型側から圧縮空気を供給してキャビ型にシートを密着させてプラグ型とキャビ型を８秒間閉じて１８０℃にて真空圧空成形し、図１に示す発泡樹脂容器を得た。
Example 1
[Manufacture of foamed resin containers]
A foamed resin container shown in FIG. 1 having L2 of 205 mm, W2 of 135 mm, and H2 of 31 mm was produced.
After the thermoplastic polyester resin foam sheet is heated in a heater bath at 150 ° C. for 90 seconds to bring the sheet surface temperature to 125 ° C., compressed air is supplied from the plug mold side to bring the sheet into close contact with the mold mold, The mold was closed for 8 seconds and vacuum-pressure molded at 180 ° C. to obtain a foamed resin container shown in FIG.
（比較例１）
圧空成形の時間を２０秒に変更した以外は、実施例１と同様にして発泡樹脂容器を製造した。
(Comparative Example 1)
A foamed resin container was produced in the same manner as in Example 1 except that the pressure forming time was changed to 20 seconds.
（比較例２）
圧空成形の時間を３秒に変更した以外は、実施例１と同様にして発泡樹脂容器を製造した。
(Comparative Example 2)
A foamed resin container was produced in the same manner as in Example 1 except that the pressure forming time was changed to 3 seconds.
製造された発泡樹脂容器について、各測定及び評価を行い、結果を表１に示した。 Each measurement and evaluation was performed on the manufactured foamed resin container, and the results are shown in Table 1.
［発泡樹脂容器の結晶化熱量の測定］
得られた発泡樹脂容器の底面から試料を採取し、下記測定条件のもと、ＪＩＳ Ｋ７１２２に従いＤＳＣ測定を行い、結晶化熱量を求めた。得られた結果を表１に示す。
測定装置：示差走査熱量計装置 ＤＳＣ７０００Ｘ型（（株）日立ハイテクサイエンス社製）
試料量：５．５±０．５ｍｇ
リファレンス（アルミナ）量：５ｍｇ
窒素ガス流量：２０ｍＬ／ｍｉｎ
試験数：２
[Measurement of heat of crystallization of foamed resin container]
A sample was taken from the bottom surface of the obtained foamed resin container, and DSC measurement was performed according to JIS K7122 under the following measurement conditions to determine the heat of crystallization. The obtained results are shown in Table 1.
Measuring apparatus: differential scanning calorimeter DSC7000X (manufactured by Hitachi High-Tech Science Co., Ltd.)
Sample amount: 5.5 ± 0.5 mg
Reference (alumina) amount: 5mg
Nitrogen gas flow rate: 20 mL / min
Number of tests: 2
［発泡樹脂容器の結晶化度の測定］
上記［発泡樹脂容器の結晶化熱量の測定］で得られたＤＳＣ曲線の融解熱量、及び結晶化熱量から、下記式（ＩＩ）より結晶化度を算出した。得られた結果を表１に示す。
結晶化度（％）＝｛（融解熱量の絶対値（Ｊ／ｇ）−結晶化熱量の絶対値（Ｊ／ｇ））÷完全結晶化熱量（Ｊ／ｇ）｝×１００・・・（ＩＩ）
[Measurement of crystallinity of foamed resin container]
The degree of crystallinity was calculated from the following formula (II) from the heat of fusion and the heat of crystallization of the DSC curve obtained in [Measurement of heat of crystallization of foamed resin container]. The obtained results are shown in Table 1.
Crystallinity (%) = {(Absolute value of heat of fusion (J / g) −Absolute value of heat of crystallization (J / g)) ÷ Complete heat of crystallization (J / g)} × 100 (II )
［発泡樹脂容器の耐熱性の評価］
得られた発泡樹脂容器を２００℃で１０分間焼成し、発泡樹脂容器の変形具合を確認した。得られた結果を表１に示す。
○：大きな変形はない。
×：変形が大きく、容器として機能しない。
[Evaluation of heat resistance of foamed resin container]
The obtained foamed resin container was baked at 200 ° C. for 10 minutes, and the deformation state of the foamed resin container was confirmed. The obtained results are shown in Table 1.
○: No major deformation.
X: Deformation is large and does not function as a container.
［発泡樹脂容器の低温脆性の評価］
得られた発泡樹脂容器に水を２５０ｍＬ入れて凍らせ、これを高さ８０ｃｍから落下させ、発泡樹脂容器の破損状況を確認した。得られた結果を表１に示す。
○：破損の割合が少ない。
×：破損の割合が多い。
[Evaluation of low-temperature brittleness of foamed resin containers]
The obtained foamed resin container was frozen by adding 250 mL of water, dropped from a height of 80 cm, and the state of breakage of the foamed resin container was confirmed. The obtained results are shown in Table 1.
○: The rate of breakage is small.
X: There is much damage rate.
表１に示す結果から、結晶化度が２０％以上である実施例１及び比較例１は耐熱性に優れるのに対し、結晶化度が２０％未満である比較例２は耐熱性に劣っていた。
また、結晶化熱量の絶対値が１ｍＪ／ｍｇ以上の実施例１及び比較例２は低温脆性に優れるのに対し、結晶化熱量の絶対値が１ｍＪ／ｍｇ未満の比較例１は低温脆性に劣っていた。
From the results shown in Table 1, Example 1 and Comparative Example 1 having a crystallinity of 20% or more are excellent in heat resistance, whereas Comparative Example 2 having a crystallinity of less than 20% is inferior in heat resistance. It was.
Further, Example 1 and Comparative Example 2 having an absolute value of crystallization heat quantity of 1 mJ / mg or more are excellent in low-temperature brittleness, whereas Comparative Example 1 having an absolute value of crystallization heat quantity of less than 1 mJ / mg is inferior in low-temperature brittleness. It was.
２０ 発泡樹脂容器、１ 底壁、２ 側壁、３ フランジ部、３Ａ つまみ部、２４Ａ、２４Ｂ 底壁補強部、５ 側壁補強部、６ コーナー部、７ 開口部、８ 容器本体 20 foamed resin container, 1 bottom wall, 2 side walls, 3 flanges, 3A knob, 24A, 24B bottom wall reinforcement, 5 sidewall reinforcement, 6 corner, 7 opening, 8 container body
Claims (5)
結晶化熱量の絶対値が１〜５ｍＪ／ｍｇであり、
下記式（Ｉ）で算出される結晶化度が２０％以上である、発泡樹脂容器。
結晶化度（％）＝｛（融解熱量の絶対値（Ｊ／ｇ）−結晶化熱量の絶対値（Ｊ／ｇ））÷完全結晶化熱量（Ｊ／ｇ）｝×１００・・・（Ｉ） A foamed resin container comprising a foamed layer of thermoplastic polyester resin,
The absolute value of the amount of crystallization heat is 1 to 5 mJ / mg,
A foamed resin container having a crystallinity calculated by the following formula (I) of 20% or more.
Crystallinity (%) = {(absolute value of heat of fusion (J / g) −absolute value of heat of crystallization (J / g)) ÷ complete heat of crystallization (J / g)} × 100 (I )
熱可塑性ポリエステル系樹脂発泡層を含む発泡シートを１２０〜１８０℃で加熱する加熱工程、及び
前記加熱工程後、加熱した前記発泡シートを１６０〜２００℃の金型で挟み４〜１５秒間加熱成形する成形工程、を含む発泡樹脂容器の製造方法。 It is a manufacturing method of the foamed resin container according to any one of claims 1 to 3,
A heating step of heating a foamed sheet including a thermoplastic polyester resin foam layer at 120 to 180 ° C, and after the heating step, the heated foamed sheet is sandwiched between 160 to 200 ° C molds and heat molded for 4 to 15 seconds. A method for producing a foamed resin container, comprising a molding step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016154554A JP6797594B2 (en) | 2016-08-05 | 2016-08-05 | Foamed resin container and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016154554A JP6797594B2 (en) | 2016-08-05 | 2016-08-05 | Foamed resin container and its manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2018021154A true JP2018021154A (en) | 2018-02-08 |
| JP6797594B2 JP6797594B2 (en) | 2020-12-09 |
Family
ID=61164333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2016154554A Active JP6797594B2 (en) | 2016-08-05 | 2016-08-05 | Foamed resin container and its manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP6797594B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019177933A (en) * | 2018-03-30 | 2019-10-17 | 積水化成品工業株式会社 | Heat-resistant container |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06345071A (en) * | 1993-06-11 | 1994-12-20 | Sekisui Plastics Co Ltd | Heat resistant food container |
| JPH07195506A (en) * | 1993-12-28 | 1995-08-01 | Sekisui Plastics Co Ltd | Molding of crystalline foamed polyethylene terephthalate sheet |
| JP2551854B2 (en) * | 1990-02-16 | 1996-11-06 | 積水化成品工業株式会社 | Forming method of expanded polyethylene terephthalate sheet |
| JP2005008776A (en) * | 2003-06-19 | 2005-01-13 | Jsp Corp | Method for producing in-mold expansion molded product of polylactic acid-based resin and in-mold expansion molded product of polylactic acid-based resin |
| EP1652876A2 (en) * | 2004-11-02 | 2006-05-03 | Jsp Corporation | Polylactic acid resin foamed molding and process for manufacturing the same |
| CN1931902A (en) * | 2002-07-01 | 2007-03-21 | 株式会社Jsp | Polylactic acid foamed particle and molded product of the polylactic acid foamed particle |
| JP2007100025A (en) * | 2005-10-07 | 2007-04-19 | Sekisui Plastics Co Ltd | Polylactic acid-based resin expansion molded product |
| JP2014139333A (en) * | 2014-05-08 | 2014-07-31 | Sekisui Plastics Co Ltd | Polylactic acid-based resin-foamed sheet molding, and method for producing the same |
-
2016
- 2016-08-05 JP JP2016154554A patent/JP6797594B2/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2551854B2 (en) * | 1990-02-16 | 1996-11-06 | 積水化成品工業株式会社 | Forming method of expanded polyethylene terephthalate sheet |
| JPH06345071A (en) * | 1993-06-11 | 1994-12-20 | Sekisui Plastics Co Ltd | Heat resistant food container |
| JPH07195506A (en) * | 1993-12-28 | 1995-08-01 | Sekisui Plastics Co Ltd | Molding of crystalline foamed polyethylene terephthalate sheet |
| CN1931902A (en) * | 2002-07-01 | 2007-03-21 | 株式会社Jsp | Polylactic acid foamed particle and molded product of the polylactic acid foamed particle |
| JP2005008776A (en) * | 2003-06-19 | 2005-01-13 | Jsp Corp | Method for producing in-mold expansion molded product of polylactic acid-based resin and in-mold expansion molded product of polylactic acid-based resin |
| EP1652876A2 (en) * | 2004-11-02 | 2006-05-03 | Jsp Corporation | Polylactic acid resin foamed molding and process for manufacturing the same |
| JP2007100025A (en) * | 2005-10-07 | 2007-04-19 | Sekisui Plastics Co Ltd | Polylactic acid-based resin expansion molded product |
| JP2014139333A (en) * | 2014-05-08 | 2014-07-31 | Sekisui Plastics Co Ltd | Polylactic acid-based resin-foamed sheet molding, and method for producing the same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019177933A (en) * | 2018-03-30 | 2019-10-17 | 積水化成品工業株式会社 | Heat-resistant container |
| JP7097211B2 (en) | 2018-03-30 | 2022-07-07 | 積水化成品工業株式会社 | Heat-resistant container |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6797594B2 (en) | 2020-12-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5360975B2 (en) | Method for producing polyethylene resin foam blow molded article and polyethylene resin foam blow molded article | |
| US8435615B2 (en) | Hollow foamed blow-molded article | |
| JP7342178B2 (en) | Microcell foam sheet and fabrication process and use | |
| US10766166B2 (en) | Method for producing skin-covered, expanded bead molded article | |
| JP5024166B2 (en) | Foamed plastic molding and method for producing the same | |
| JP2018021154A (en) | Resin foam container and method for producing the same | |
| JP2907749B2 (en) | Method for producing modified polypropylene resin foam, method for producing molded article, and foam and molded article obtained from those methods | |
| JP5883900B2 (en) | Polylactic acid-based resin foam sheet molded body and method for producing polylactic acid-based resin foam sheet molded body | |
| JP2017193668A (en) | Thermoplastic polyester-based resin foam container | |
| JP7100216B1 (en) | Coextruded sheet | |
| JP3223407U (en) | Thermoplastic polyester resin foam container | |
| JP3717376B2 (en) | Non-crosslinked polyethylene resin foam, method for producing the same, and molded article using the same | |
| JP6588855B2 (en) | Polystyrene resin foam sheet, laminated sheet, container and lid | |
| JP3221532U (en) | Crystalline resin foam container | |
| JP3851651B2 (en) | High density polyethylene resin foam sheet and method for producing the sheet container | |
| JP6233927B2 (en) | Polystyrene resin foam sheet for thermoforming | |
| JP4771764B2 (en) | Polystyrene resin foam sheet and method for producing the same | |
| JP2013248797A (en) | High density polyethylene resin container and method of molding the same | |
| JP5751670B2 (en) | Polyethylene resin multilayer foam sheet and molded article thereof | |
| JP4422985B2 (en) | Styrene resin foam sheet, molded container, and method for producing the same | |
| JP7271262B2 (en) | CRYSTALLINE RESIN FOAM SHEET AND CRYSTALLINE RESIN FOAM CONTAINER | |
| WO2024014391A1 (en) | Co-extruded sheet | |
| WO2023188487A1 (en) | Coextruded sheet | |
| JP2005335168A (en) | Method for manufacturing inversely tapered container formed of polyolefinic resin expanded sheet | |
| KR20170029230A (en) | A method for producing kinds of tray and containers using non-crosslinked pp foamed sheet mixed with high melt strength pp resin |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A821 Effective date: 20160808 |
|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20181009 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20190628 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20190806 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20191004 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20200303 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20200501 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20201027 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20201118 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 6797594 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |