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TW202330361A - 萃取袋、及萃取袋之製造方法，以及萃取袋用薄膜及萃取袋用薄膜之製造方法 - Google Patents

萃取袋、及萃取袋之製造方法，以及萃取袋用薄膜及萃取袋用薄膜之製造方法 Download PDF

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Publication number
TW202330361A
TW202330361A TW112101725A TW112101725A TW202330361A TW 202330361 A TW202330361 A TW 202330361A TW 112101725 A TW112101725 A TW 112101725A TW 112101725 A TW112101725 A TW 112101725A TW 202330361 A TW202330361 A TW 202330361A
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Taiwan
Prior art keywords
polylactic acid
acid resin
fabric layer
layer
extraction bag
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TW112101725A
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English (en)
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斎藤充範
村岡伸哉
山口南生子
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日商大紀商事股份有限公司
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Publication of TW202330361A publication Critical patent/TW202330361A/zh

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    • B65D85/70—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for
    • B65D85/804—Disposable containers or packages with contents which are mixed, infused or dissolved in situ, i.e. without having been previously removed from the package
    • B65D85/808—Disposable containers or packages with contents which are mixed, infused or dissolved in situ, i.e. without having been previously removed from the package for immersion in the liquid to release part or all of their contents, e.g. tea bags
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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
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  • Biodiversity & Conservation Biology (AREA)
  • Laminated Bodies (AREA)
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Abstract

本發明提供一種萃取袋，其即使於採用具有生物分解性之聚乳酸樹脂作為構成萃取袋之薄膜所用之不織布的樹脂及該萃取袋之附屬構件中使用之層合用之樹脂的情況，仍可不於不織布側造成損傷而可將附屬構件適當地接合於薄膜。 本發明之萃取袋(100)係將包含聚乳酸樹脂之紡黏不織布層(10)與附屬構件(20)接合而成，於附屬構件(20)之至少接觸於紡黏不織布層(10)之面設置包含聚乳酸樹脂之層合層(21)，層合層(21)中所含之聚乳酸樹脂的結晶化度設定為小於紡黏不織布層(10)中所含之聚乳酸樹脂的結晶化度。

Description

萃取袋、及萃取袋之製造方法，以及萃取袋用薄膜及萃取袋用薄膜之製造方法
本發明有關將包含聚乳酸樹脂之紡黏不織布層與附屬構件接合成之萃取袋及萃取袋之製造方法以及萃取袋用薄膜及萃取袋用薄膜之製造方法。
構成用以萃取咖啡、紅茶、湯汁等之萃取袋的薄膜，為了減低使用後廢棄時之環境負荷，已開發出使用生物分解性材料者(例如，參見專利文獻1及2)。
專利文獻1中記載之咖啡萃取用薄膜材料係自由生物分解性熱塑性聚合物所成之熔噴極細纖維不織布所形成者。該文獻的實施例中，記載使用由聚乳酸極細纖維所成之熔噴不織布形成的滴漏式咖啡濾網。
專利文獻2中記載之萃取用薄膜亦係將由聚乳酸系之樹脂所成之熔噴不織布層與紡黏不織布層積層而成者。該文獻之圖2中，記載於使用該萃取用薄膜形成之袋體的表面，接著有用以指尖捏住之標籤的茶袋。
上述專利文獻1及2中記載之萃取用薄膜，即使使用後以被萃取物收納於袋中之狀態掩埋於土中，由於萃取用薄膜與被萃取物一起經微生物分解，故可減低環境負荷。 [先前技術文獻] [專利文獻]
[專利文獻1] 日本特開2000-336570號公報 [專利文獻2] 日本特開2016-168569號公報
[發明欲解決之課題]
關於萃取袋為了減低環境負荷，不僅是薄膜，亦期望所有附屬構件使用生物分解之材料。作為此種生物分解性材料，存在有聚乳酸、聚羥基烷酸酯、聚琥珀酸丁二酯等之各種者，但所有構件中，較佳以具有同樣分解特性之方式使用相同材料之聚乳酸樹脂。此處，既有的聚乳酸樹脂，雖然亦存在一部分熔點不同者，但作為通用材料，係具有大致相同熔點者。若如此，則作為使用於萃取袋之不織布的樹脂及附屬構件之層合用的樹脂，若採用相同材料的聚乳酸樹脂，則以貼合為目的之加熱時，形成不織布的纖維有受到損壞之虞。
關於此點，專利文獻1中記載的咖啡萃取用薄膜材料，若薄膜因熱損傷而變脆時，會有因咖啡萃取時之負荷而使濾網自附屬構件的勾掛部剝離、脫落之虞。專利文獻2中記載之萃取用薄膜，若標籤對袋體的接著力過強，則將標籤自袋體剝離時，有於薄膜上開孔之虞。另一方面，標籤對袋體的接著力過弱時，將被萃取物填充至袋體之加工時，標籤會自袋體脫落，可能成為製造不良之原因。
本發明係鑑於上述問題點而完成者，目的在於提供一種萃取袋、及萃取袋之製造方法，以及萃取袋用薄膜及萃取袋用薄膜之製造方法，該萃取袋即使於採用具有生物分解性之聚乳酸樹脂作為構成萃取袋之薄膜所用之不織布的樹脂及該萃取袋之附屬構件中使用之層合用之樹脂的情況，仍可不於不織布側造成損傷而可將附屬構件適當地接合於薄膜。 [用以解決課題之手段]
用以解決上述課題之本發明之萃取袋的特徵構成在於 係將包含聚乳酸樹脂之紡黏不織布層與附屬構件接合而成之萃取袋， 於前述附屬構件之至少接觸於前述紡黏不織布層之面設置包含聚乳酸樹脂之層合層， 前述層合層中所含之聚乳酸樹脂的結晶化度設定為小於前述紡黏不織布層中所含之聚乳酸樹脂的結晶化度。
根據本構成之萃取袋，由於附屬構件之層合層中所含之聚乳酸樹脂的結晶化度設定為小於紡黏不織布層中所含之聚乳酸樹脂的結晶化度，故於為了接合而加熱時，僅使附屬構件之層合層中所含之聚乳酸樹脂軟化，使經軟化之層合層咬入紡黏不織布層的纖維間可將附屬構件與紡黏不織布層一體化。此時，紡黏不織布層中所含之聚乳酸樹脂由於在層合層中所含之聚乳酸樹脂軟化之溫度亦未軟化，因此紡黏不織布層不會受到損壞，可維持作為濾網之功能。且，由於紡黏不織布層與附屬構件之接著力經適當控制，故即使附屬構件自紡黏不織布層剝落時，紡黏不織布層亦無損傷之虞。
本發明之萃取袋中，較佳前述層合層中所含之聚乳酸樹脂的結晶化度與前述紡黏不織布層中所含之聚乳酸樹脂的結晶化度之差設定為10%以上。
根據本構成之萃取袋，由於層合層中所含之聚乳酸樹脂的結晶化度與紡黏不織布層中所含之聚乳酸樹脂的結晶化度之差設定為10%以上，故僅結晶化度較低之層合層中所含的聚乳酸樹脂被軟化，因經軟化的層合層咬入紡黏不織布層的纖維間，故可牢固地接合而一體化。此時，由於紡黏不織布層中所含之聚乳酸樹脂的結晶化度比層合層中所含之聚乳酸樹脂高10%以上，故於層合層中所含之聚乳酸樹脂軟化之溫度下亦未軟化，而保持紡黏不織布層的構造，因此紡黏不織布層不會受到損壞，可維持作為濾網之功能。
本發明之萃取袋中，較佳於前述紡黏不織布層上設置包含聚乳酸樹脂之熔噴不織布層。
根據此構成之萃取袋，由於紡黏不織布層上設置包含聚乳酸樹脂之熔噴不織布層，故整個萃取袋減低了環境負荷，且藉由紡黏不織布層與熔噴不織布層的積層構造，可具有作為濾網之優異功能。
用以解決上述課題之本發明之萃取袋之製造方法的特徵構成在於 係將包含聚乳酸樹脂之紡黏不織布層與附屬構件接合而成的萃取袋之製造方法， 於前述附屬構件之至少接觸於前述紡黏不織布層之面設置包含聚乳酸樹脂之層合層， 前述層合層中所含之聚乳酸樹脂的結晶化度設定為小於前述紡黏不織布層中所含之聚乳酸樹脂的結晶化度， 於將前述紡黏不織布層與前述附屬構件接合時，實施賦予比聚乳酸樹脂之玻璃轉移溫度Tg高30~100℃之溫度的加熱步驟。
根據本構成之萃取袋之製造方法，由於附屬構件之層合層中所含之聚乳酸樹脂的結晶化度設定為小於紡黏不織布層中所含之聚乳酸樹脂的結晶化度，故將紡黏不織布層與附屬構件接合時，藉由實施賦予比聚乳酸樹脂之玻璃轉移溫度Tg高30~100℃之溫度的加熱步驟，僅使附屬構件之層合層中所含之聚乳酸樹脂軟化，使經軟化之層合層咬入紡黏不織布層的纖維間可將附屬構件與紡黏不織布層一體化。此時，紡黏不織布層中所含之聚乳酸樹脂由於在層合層中所含之聚乳酸樹脂軟化之溫度亦未軟化，因此紡黏不織布層不會受到損壞，可維持作為濾網之功能。且，由於紡黏不織布層與附屬構件之接著力經適當控制，故即使附屬構件自紡黏不織布層剝落時，紡黏不織布層亦無損傷之虞。
用以解決上述課題之本發明之萃取袋用薄膜的特徵構成在於 係將包含聚乳酸樹脂之紡黏不織布層與附屬構件接合而成之萃取袋用薄膜， 於前述附屬構件之至少接觸於前述紡黏不織布層之面設置包含聚乳酸樹脂之層合層， 前述層合層中所含之聚乳酸樹脂的結晶化度設定為小於前述紡黏不織布層中所含之聚乳酸樹脂的結晶化度。
根據本構成之萃取袋用薄膜，由於附屬構件之層合層中所含之聚乳酸樹脂的結晶化度設定為小於紡黏不織布層中所含之聚乳酸樹脂的結晶化度，故為了接合而加熱時，僅使附屬構件之層合層中所含之聚乳酸樹脂軟化，使經軟化之層合層咬入紡黏不織布層的纖維間可將附屬構件與紡黏不織布層一體化。此時，紡黏不織布層中所含之聚乳酸樹脂由於在層合層中所含之聚乳酸樹脂軟化之溫度亦未軟化，因此紡黏不織布層不會受到損壞，可維持作為濾網之功能。且，由於紡黏不織布層與附屬構件之接著力經適當控制，故即使附屬構件自紡黏不織布層剝落時，紡黏不織布層亦無損傷之虞。
用以解決上述課題之本發明之萃取袋用薄膜之製造方法的特徵構成在於 係將包含聚乳酸樹脂之紡黏不織布層與附屬構件接合而成之萃取袋用薄膜之製造方法， 於前述附屬構件之至少接觸於前述紡黏不織布層之面設置包含聚乳酸樹脂之層合層， 前述層合層中所含之聚乳酸樹脂的結晶化度設定為小於前述紡黏不織布層中所含之聚乳酸樹脂的結晶化度， 於將前述紡黏不織布層與前述附屬構件接合時，實施賦予比聚乳酸樹脂之玻璃轉移溫度Tg高30~100℃之溫度的加熱步驟。
根據本構成之萃取袋用薄膜之製造方法，由於附屬構件之層合層中所含之聚乳酸樹脂的結晶化度設定為小於紡黏不織布層中所含之聚乳酸樹脂的結晶化度，故將紡黏不織布層與附屬構件接合時，藉由實施賦予比聚乳酸樹脂之玻璃轉移溫度Tg高30~100℃之溫度的加熱步驟，僅使附屬構件之層合層中所含之聚乳酸樹脂軟化，使經軟化之層合層咬入紡黏不織布層的纖維間可將附屬構件與紡黏不織布層一體化。此時，紡黏不織布層中所含之聚乳酸樹脂由於在層合層中所含之聚乳酸樹脂軟化之溫度亦未軟化，因此紡黏不織布層不會受到損壞，可維持作為濾網之功能。且，由於紡黏不織布層與附屬構件之接著力經適當控制，故即使附屬構件自紡黏不織布層剝落時，紡黏不織布層亦無損傷之虞。
以下，針對本發明之萃取袋、及萃取袋之製造方法，以及萃取袋用薄膜及萃取袋用薄膜之製造方法的實施形態，詳細加以說明。又，各圖所示之萃取袋的層構造之形狀及大小關係，為了容易理解本發明，而有適當簡略化及誇大，未必是直接反映實際形狀及大小關係。且本發明無意侷限於以下說明之構成。
[萃取袋用薄膜] 本發明之萃取袋用薄膜，作為基本構成，係包括包含聚乳酸樹脂之紡黏不織布層與附屬構件積層而成之積層體者。附屬構件係於其表面(至少與紡黏不織布層接觸之面)層合加工包含聚乳酸樹脂的材料者。作為層合加工之方法，已知有擠出層合、乾層合、熱層合、濕層合等，但如下述，若層合層中所含之聚乳酸樹脂的結晶化度小於紡黏不織布層中所含之聚乳酸樹脂的結晶化度，則使用任何加工方法均不成問題。作為附屬構件，舉例為例如用以將由本發明之萃取袋用薄膜製作的萃取袋勾掛於杯子等之容器的勾掛片、安裝於萃取袋之附線的標籤，及用於使萃取袋於熱水中上下移動的薄板狀構件等。於紡黏不織布層上，根據需要，設置包含聚乳酸樹脂之熔噴不織布層。
[萃取袋] 本發明之萃取袋係將本發明之萃取袋用薄膜製袋加工為袋狀者。作為製袋加工之方法，舉例為利用熱或超音波之熔接、使用接著劑之熔接、使用線縫合等。以下，針對本發明之萃取袋的代表性三個實施形態加以說明。
＜第一實施形態＞ 圖1係示意性顯示本發明之第一實施形態的萃取袋之積層構造的剖面圖。該萃取袋係作為將紡黏不織布層10與作為附屬構件的紙板20接合成之滴濾袋100而使用。
[紡黏不織布層] 紡黏不織布層10係作為用以萃取目的成分的濾網發揮功能之層。紡黏不織布層10藉由對自紡紗噴嘴擠出的熔融樹脂吹拂高速氣流而進行牽引、延伸同時冷卻固化而形成纖維，將該纖維集聚於收集器上作成網片而形成。第一實施形態之滴濾袋100中，作為構成紡黏不織布層10的樹脂，使用生物分解性樹脂的聚乳酸樹脂。紡黏不織布層10的單位面積重較佳為8~20g/m 2，更佳為12~20g/m 2。
[紙板] 紙板20係用以構成將滴濾袋100勾掛於杯子等容器上之勾掛片的構件。因此，為了具有某程度剛性，紙板的單位面積重較佳為150~300g/m 2。
紙板20至少於與紡黏不織布層10接觸之面設置塗佈有以熱塑性樹脂為主成分之層合材的層合層21。第一實施形態之滴濾袋100中，作為用以形成層合層21的樹脂，與紡黏不織布層10同樣，使用生物分解性樹脂的聚乳酸樹脂。層合層21的厚度較佳為20~80μm，更佳為40~ 80μm。
[聚乳酸樹脂] 第一實施形態之滴濾袋100係將紙板20接合於紡黏不織布層10者，但兩者之接合係藉由將紡黏不織布層10與紙板20予以積層並加熱，使紙板20表面之層合層21中所含的聚乳酸樹脂軟化，使經軟化之聚乳酸樹脂咬入紡黏不織布層10之間隙而進行。因此，為了將紙板20良好地接合於紡黏不織布層10，重要的是掌握聚乳酸樹脂軟化之機制，於適當條件下接合(加熱)。此處，聚乳酸樹脂係可於結晶相與非晶相之間相轉變之結晶性高分子。聚乳酸樹脂與其他一般高分子材料一樣，具有如下性質：若超過玻璃轉移溫度則逐漸軟化，但非晶部分越多越容易軟化，於結晶狀態不容易軟化。而且，聚乳酸樹脂之結晶化度越高，越具有高耐熱性。
本發明人等認為，將設置有包含聚乳酸樹脂之層合層21的紙板20接合於包含聚乳酸樹脂之紡黏不織布層10時，作為左右接合好壞之一個原因，聚乳酸樹脂之結晶化度具有密切相關，而發現藉由適當設定紡黏不織布層10側的聚乳酸樹脂的結晶化度與紙板20(層合層21)側之聚乳酸樹脂的結晶化度之關係，可不對紡黏不織布層10造成損壞，而可將紙板20接合於紡黏不織布層10。
聚乳酸樹脂之結晶化度係如下求出。首先，將自紡黏不織布層10、層合層21切出之試驗片設定於示差掃描熱量計(DSC)中，自比聚乳酸樹脂之玻璃轉移溫度Tg (約50~60℃)低的溫度至超過熔點Tm(約150~170℃)之溫度，以特定升溫速度升溫。例如，自30℃至240℃，以升溫速度10℃/分鐘升溫。該升溫過程中，聚乳酸樹脂之非晶部分一旦相轉移為結晶，進而升溫時結晶熔解，最終成為熔融狀態。此處，將聚乳酸樹脂之非晶部分相轉移至結晶時之結晶化發熱量設為ΔHc，將聚乳酸樹脂之結晶熔解時之結晶熔解熱量設為ΔHm時，聚乳酸樹脂之結晶化度χc(%)係自下述式(1)算出： χc(%)=(ΔHm-ΔHc)/Q×100・・・(1) 又，Q係完全結晶之熔解熱量，於聚乳酸樹脂時，Q= 93J/g。
根據本發明人等獲得之新見解，為了使紙板20無問題地接合於紡黏不織布層10，重要的是將紙板20的層合層21中所含之聚乳酸樹脂的結晶化度設定為小於紡黏不織布層10中所含之聚乳酸樹脂的結晶化度。例如將層合層21中所含之聚乳酸樹脂的結晶化度設定為1~40%，將紡黏不織布層10中所含之聚乳酸樹脂的結晶化度設定為30~ 60%。此處，層合層21中所含之聚乳酸樹脂的結晶化度與紡黏不織布層10中所含之聚乳酸樹脂的結晶化度之差較佳設定為10%以上。該情況下，成為紙板20的層合層21中所含之聚乳酸樹脂容易軟化，紡黏不織布層10中所含之聚乳酸樹脂難以軟化。於是，若施加比聚乳酸樹脂之玻璃轉移溫度Tg高的溫度(例如Tg+30℃~100℃)將紡黏不織布層10與紙板20接合，則僅結晶化度較低的紙板20之層合層21中所含之聚乳酸樹脂被軟化，藉由經軟化之層合層21咬入紡黏不織布層10之纖維間，而使紙板20牢固地接合於紡黏不織布層10而一體化。此時，由於紡黏不織布層10中所含之聚乳酸樹脂之結晶化度高於層合層21中所含之聚乳酸樹脂，故於層合層21中所含之聚乳酸樹脂軟化之溫度下亦不軟化，而保持紡黏不織布層10之構造。如此，若將紙板20的層合層21中所含之聚乳酸樹脂的結晶化度設定為小於紡黏不織布層10中所含之聚乳酸樹脂的結晶化度，則可將使用以往認為困難的同種材料(聚乳酸樹脂)的紡黏不織布層10與板紙20(層合層21)接合，可不使紡黏不織布層10受到損壞，而可維持作為濾網之功能。此外，滴濾袋100由於以聚乳酸樹脂為主要原料，故亦大有助於使用後廢棄時之環境負荷減低。
＜第二實施形態＞ 圖2係示意性顯示本發明之第二實施形態之萃取袋的積層構造的剖面圖。該萃取袋係將紡黏不織布層10與熔噴不織布層15積層，於該積層體接合紙板20之作為咖啡用的滴濾袋200而使用。第二實施形態之滴濾袋200，係於第一實施形態之滴濾袋100中，於紡黏不織布層10上，設置熔噴不織布層15者。因此，以下項目中，僅針對熔噴不織布層15加以說明，關於與第一實施形態之滴濾袋100的構成相同的構成將省略其詳細說明。
[熔噴不織布層] 熔噴不織布層15係於製袋時作為防止接著劑或內容物的粉漏出發揮功能之層。熔噴不織布層15係藉由對自紡絲噴嘴擠出之熔融樹脂吹拂高溫高速氣流，而將該熔融樹脂拉伸纖維化使之飛散，將其聚集於收集器上固化為薄膜狀而形成。第二實施形態之滴濾袋200中，作為構成熔噴不織布層15之樹脂，與紡黏不織布層10同樣，較佳使用生物分解性樹脂的聚乳酸樹脂。如此，藉由於所有不織布層中包含聚乳酸樹脂，整個滴濾袋200可減低環境負荷，且藉由紡黏不織布層10與熔噴不織布層15的積層構造，可具有作為濾網之優異功能。熔噴不織布層15之單位面積重較佳為1~10g/m 2，更佳為6~10g/m 2。
熔噴不織布層15中所含之聚乳酸樹脂的結晶化度未特別限制，但已知為小於紡黏不織布層10中所含之聚乳酸樹脂的結晶化度。例如，紡黏不織布層10中所含之聚乳酸樹脂的結晶化度如上述般設定為30~60%時，熔噴不織布層15中所含之聚乳酸樹脂的結晶化度為20~40%。此情況下，以熔噴不織布層15成為內側之方式將熔噴不織布層15與紡黏不織布層10之積層體摺疊予以加熱時，熔噴不織布層15發揮作為接著劑之功能，使製袋變得容易。
＜第三實施形態＞ 圖3係示意性顯示本發明之第三實施形態之萃取袋的積層構造的剖面圖。該萃取袋係作為將紡黏不織布層10與作為附屬構件之標籤30接合之茶包300而使用者。又，該第三實施形態之茶包300中，亦如第二實施形態之滴濾袋200，採用於紡黏不織布層10上積層熔噴不織布層15之構成。第三實施形態之茶包300，係於第一實施形態之滴濾袋100中，設置標籤30代替紙板20者。因此，以下項目中，僅針對標籤30加以說明，與第一實施形態之滴濾袋100之構成相同的構成將省略其詳細說明。
[標籤] 標籤30係茶包300以線吊起時以手指捏取之構件，未使用時接著於袋表面，於使用時自袋剝下。標籤之單位面積重較佳為50~150g/m 2。
於標籤30，於至少與紡黏不織布層10接觸之面設置塗佈有以熱塑性樹脂為主成分之層合材的層合層31。第三實施形態之茶包300中，作為用以形成層合層31的樹脂，與紡黏不織布層10同樣，使用生物分解性樹脂的聚乳酸樹脂。層合層31之厚度較佳為10~80μm，更佳為40 ~80μm。
標籤30之層合層31中所含之聚乳酸樹脂的結晶化度設定為小於紡黏不織布層10中所含之聚乳酸樹脂的結晶化度。例如，將層合層31中所含之聚乳酸樹脂的結晶化度設定為1~20%，將紡黏不織布層10中所含之聚乳酸樹脂的結晶化度設定為30~60%。此處，層合層31中所含之聚乳酸樹脂的結晶化度與紡黏不織布層10中所含之聚乳酸樹脂的結晶化度之差較佳設定為10%以上。此情況下，由於成為標籤30之層合層31中所含之聚乳酸樹脂容易軟化，紡黏不織布層10中所含之聚乳酸樹脂難以軟化，故標籤30可以適當接著力接著於紡黏不織布層10。其結果，於被萃取物填充加工至茶包300時，標籤30不會脫落，且於使用時自茶包300剝下標籤30時，茶包300無損傷之虞。
[萃取袋(萃取袋用薄膜)之製造方法] 本發明之萃取袋(萃取袋用薄膜)例如可使用加熱夾輥製造。又，加熱夾輥係過去習知之製造裝置，省略圖示。
製造第一實施形態之滴濾袋100時，於紡黏不織布層10上，積層具有由擠出層合而形成之層合層21的紙板20，使該積層體通過一對加熱夾輥。於製造第二實施形態之滴濾袋200時，於紡黏不織布層10上形成熔噴不織布層15，接著在紡黏不織布層10側積層具有由擠出層合而形成之層合層21的紙板20，將該積層體通過一對加熱夾輥。製造第三實施形態之茶包300時，於紡黏不織布層10上，積層具有由乾層合而形成之層合層31的標籤30，將該積層體通過一對加熱夾輥。
此處，若將加熱夾輥之加熱溫度設定為高於聚乳酸樹脂之玻璃轉移溫度Tg之溫度(例如Tg+30℃~100℃)，則例如於第一實施形態之滴濾袋100中，積層體通過一對加熱夾輥時，紙板20表面之層合層21中所含之聚乳酸樹脂軟化，咬入紡黏不織布層10之間隙，使紡黏不織布層10與紙板20一體化接合。此時，紡黏不織布層10中所含之聚乳酸樹脂由於在層合層21中所含之聚乳酸樹脂軟化之溫度亦不軟化，故紡黏不織布層10不會受到損壞，可維持作為濾網的功能。第二實施形態之滴濾袋200及第三實施形態之茶包300中，均利用相同現象，可將紡黏不織布層10與紙板20或標籤30接合。
本發明之萃取袋(萃取袋用薄膜)之製造方法中所用之一對加熱夾輥，可為兩個平輥組合者，亦可為一個為壓紋輥，另一個為平輥。 [實施例]
以下，針對本發明之萃取袋的實施例加以說明。然而，本發明並不限於以下實施例。
分別製作具有本發明之特徵構成的萃取袋(實施例1~14)及不具有本發明之特徵構成之萃取袋(比較例1~2)，並進行評價。
[結晶化度(%)] 亦不織布採取試驗片，將試驗片設定於示差掃描熱量計(DSC) (TA INSTRUMENTS公司製，品號2920MDSC V2.6A)。隨後，將升溫速度設為10℃/分鐘升溫至240℃，測定結晶化發熱量ΔHc與結晶熔解熱量ΔHm。接著，基於前述式(1)算出不織布之結晶化度。
[單位面積重(g/m 2)] 根據「JIS L 1913 一般不織布試驗方法」，自不織布採取10cm見方的試驗片，測定質量，算出不織布的單位面積重。
[評價] 針對熱密封處理後之萃取袋的狀態，藉由以下基準藉由目視評價。 良好：紡黏不織布層未受損壞，且紙板接合。 不良：紡黏不織布層受損壞，或紙板未接合。
＜實施例1＞ 如圖1所示，在包含結晶化度為50%之聚乳酸樹脂的紡黏不織布(單位面積重：15g/m 2)上，積層具有層合層(厚度：40μm)的紙板(單位面積重：200g/m 2)，作為熱密封處理係藉由通過加熱夾輥，製作實施例1之萃取袋。熱密封處理係以溫度110℃，壓力0.5MPa，進行0.5秒。層合層係藉由將處於流動狀態之聚乳酸樹脂擠出至紙板上並擠出層合而形成。聚乳酸樹脂使用結晶化度為3%者。又，實施例1之萃取袋實際上係作成袋狀之前的萃取袋用薄膜，但由於材料特性本身為不變化，故作為萃取袋予以評價。
＜實施例2~14、比較例1～2＞ 除了設定為具有表1所示之構成以外，以與實施例1之萃取袋同樣，製作實施例2~14及比較例1~2之萃取袋。又實施例9~11之萃取袋中，如圖2所示，熔噴不織布層積層於紡黏不織布層上。且，實施例13及14以及比較例1~2之萃取袋中，藉由乾層合貼合延伸之聚乳酸膜，形成層合層。
實施例1~14之萃取袋及比較例1~2之萃取袋的構成以及評價結果示於表1。
層合層中所含之聚乳酸樹脂的結晶化度設定為小於紡黏不織布層中所含之聚乳酸樹脂的結晶化度之實施例1~14的萃取袋，於紡黏不織布層均未損壞，可進行熱密封處理。且，實施例1~14之萃取袋，僅結晶化度較低之紙板的層合層中所含的聚乳酸樹脂被軟化，經軟化之層合層咬入紡黏不織布層的纖維間，故紙板牢固地接合於紡黏不織布層上，紙板與紡黏不織布層成為一體化。
相對於此，熱密封溫度設定為130℃，層合層中所含之聚乳酸樹脂的結晶化度與紡黏不織布層中所含之聚乳酸樹脂的結晶化度設定為相等(即層合層中所含之聚乳酸樹脂的結晶化度未設定為小於紡黏不織布層中所含之聚乳酸樹脂的結晶化度)之比較例1的萃取袋，層合層的樹脂不軟化，紡黏不織布層與紙板未接合。且，與比較例1之萃取袋相同構成，且熱密封溫度設定為150℃之比較例2的萃取袋，層合層的聚乳酸樹脂雖軟化，但紡黏不織布層中所含之纖維也軟化，紡黏不織布層受到損壞。 [產業上之可利用性]
本發明之萃取袋及萃取袋用薄膜可作為咖啡萃取中使用之滴濾袋，或作為茶類萃取所使用之茶包而利用，但亦可作為鰹、昆布等之湯汁萃取所使用之湯包袋加以利用。且，本發明之萃取袋及萃取袋用薄膜之製造方法可利用於上述各用途中之濾網製造。
10:紡黏不織布層 15:熔噴不織布層 20:紙板(附屬構件) 21:層合層 30:標籤(附屬構件) 31:層合層 100:滴濾袋(萃取袋) 200:滴濾袋(萃取袋) 300:茶包(萃取袋)
[圖1]係示意性顯示本發明之第一實施形態的萃取袋(滴濾袋)之積層構造的剖面圖。 [圖2]係示意性顯示本發明之第二實施形態的萃取袋(滴濾袋)之積層構造的剖面圖。 [圖3]係示意性顯示本發明之第三實施形態的萃取袋(茶包)之積層構造的剖面圖。
10:紡黏不織布層
20:紙板(附屬構件)
21:層合層
100:滴濾袋(萃取袋)

Claims (6)

  1. 一種萃取袋，其係將包含聚乳酸樹脂之紡黏不織布層與附屬構件接合而成， 於前述附屬構件之至少接觸於前述紡黏不織布層之面設置包含聚乳酸樹脂之層合層， 前述層合層中所含之聚乳酸樹脂的結晶化度設定為小於前述紡黏不織布層中所含之聚乳酸樹脂的結晶化度。
  2. 如請求項1之萃取袋，其中前述層合層中所含之聚乳酸樹脂的結晶化度與前述紡黏不織布層中所含之聚乳酸樹脂的結晶化度之差設定為10%以上。
  3. 如請求項1或2之萃取袋，其中於前述紡黏不織布層上設置包含聚乳酸樹脂之熔噴不織布層。
  4. 一種萃取袋之製造方法，其係將包含聚乳酸樹脂之紡黏不織布層與附屬構件接合而成的萃取袋之製造方法， 於前述附屬構件之至少接觸於前述紡黏不織布層之面設置包含聚乳酸樹脂之層合層， 前述層合層中所含之聚乳酸樹脂的結晶化度設定為小於前述紡黏不織布層中所含之聚乳酸樹脂的結晶化度， 於將前述紡黏不織布層與前述附屬構件接合時，實施賦予比聚乳酸樹脂之玻璃轉移溫度Tg高30~100℃之溫度的加熱步驟。
  5. 一種萃取袋用薄膜，其係將包含聚乳酸樹脂之紡黏不織布層與附屬構件接合而成之萃取袋用薄膜， 於前述附屬構件之至少接觸於前述紡黏不織布層之面設置包含聚乳酸樹脂之層合層， 前述層合層中所含之聚乳酸樹脂的結晶化度設定為小於前述紡黏不織布層中所含之聚乳酸樹脂的結晶化度。
  6. 一種萃取袋用薄膜之製造方法，其係將包含聚乳酸樹脂之紡黏不織布層與附屬構件接合而成之萃取袋用薄膜之製造方法， 於前述附屬構件之至少接觸於前述紡黏不織布層之面設置包含聚乳酸樹脂之層合層， 前述層合層中所含之聚乳酸樹脂的結晶化度設定為小於前述紡黏不織布層中所含之聚乳酸樹脂的結晶化度， 於將前述紡黏不織布層與前述附屬構件接合時，實施賦予比聚乳酸樹脂之玻璃轉移溫度Tg高30~100℃之溫度的加熱步驟。
TW112101725A 2022-01-19 2023-01-16 萃取袋、及萃取袋之製造方法，以及萃取袋用薄膜及萃取袋用薄膜之製造方法 TW202330361A (zh)

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