CN1061623C - 食品包装用的伸展性管状膜 - Google Patents
食品包装用的伸展性管状膜 Download PDFInfo
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Abstract
为包装食品用的管状膜。此管状膜包含粘胶溶液再生的材料。管状材料是在湿态下纵向拉伸从+8到+40%和横向拉伸从-20%到+40%。拉伸在干燥过程中被维持。所述纵向拉伸和横向拉伸足以达到较实现再生起的表面积至少增加10%。管状材料壁厚为同样管材但未被联合拉伸的壁厚的60%到90%。本发明也包括制作管状状材料的方法,包括在湿态时拉伸再生的管状材料和在干燥过程中维持拉伸。
Description
本发明是共同未决专利中请系列号08/568,076(申请日期是1995年12月6日)的部分继续申请。
本发明涉及包装食品如香肠和奶酪用的管状膜。尤其涉及由再生纤维素制成的包装材料。
已知用再生纤维素制成的食品包装管状膜(casing)已延续相当时期,而且可用本领域技术人员已知的方法制备。具体说是用碱处理由棉花、木材或其他植物纤维制成的纤维素后再溶于二硫化碳制成黄原酸酯粘胶,粘胶制成后通过模具挤压成管。制成管后通常是通过一个含有诸如硫酸钠和硫酸的凝结材料的凝结浴槽被再生。然后将包装管膜干燥。
美国专利2,999,756和3,835,113详细描述了这些加工过程。
同样已知含纤维素的包装管可由将粘胶挤出在纤维素的纤维网上,通常为无纺纸,形成管型,随后再生而制成。这些管状包装膜称作“纤维状”管状包装膜。
如本文中应用的“再生纤维素食品管状包装膜”一词含意是要包括两种类型的包装膜。而其中的增强作用是在不妨碍本发明方法的范围之内。
再生纤维素食品包装管的成功的原因,包括相对低的成本,对烟的渗透性,强度和形状上的稳定性。
尽管再生纤维素食品包装管膜有其有利之处,在一些特性方面仍能改进。尤其是在纵向的尺度上的稳定性不够理想,特别是包装管膜在湿的状态下,也就是装上食品的包装管膜,在烟燻室和用于燻制目的而垂直悬挂时纵向伸展过长,这样的伸长可达10%或10%以上。
再生纤维素食品包装管膜具有相当好的渗透性,但还不够理想。为获得足够强度,包装管的壁必须比理想的厚,较厚的壁将用更多的粘胶材料,降低了渗透性,并减少了可缩褶(纵向折叠和压缩)成为标准单位缩褶长度的包装管的量(未缩褶长度)。
曾尝试通过改变加工条件,如对再生浴槽作化学改变,以便制造较薄管壁的包装管膜,如美国专利4,590,107所述。不足的是这些薄壁包装管膜脆裂强度和拉伸强度不能满足商业应用。
图1显示本发明管状膜的透视图。
图2显示本发明方法的方框流程图。
本发明包括一种可用于包装食品的管状膜,管膜包括一种由纤维素溶于一种溶剂形成的溶液中再生的材料,溶剂通常包括二硫化碳,但并非必须。
更具体的是本发明包括一种管膜,含有由纤维素溶液再生和干燥的材料。再生后,管膜湿态下纵向拉伸从8%到40%,横向拉伸-20%到+20%。联合纵向和横向伸展足以增加膜表面积至少达到刚刚再生后膜表面积的10%。在干燥过程中伸展被维持,管膜的壁厚等于除没经联合拉伸外其它均一致的现有技术管膜壁厚的约60%到90%。
换言之,本发明的管膜其壁厚约等于本文所述除未经拉伸外其它均一致的管膜壁厚的约60%到90%。这样的现有技术膜,再生后未被拉伸,也未增加至少10%的表面积,也未被纵向伸展8%以上。另外现有技术的膜干燥状态下这样的拉伸也不被维持。因此现有技术的膜不具有本发明的膜的独特性能,即降低的膜厚度,高脆裂强度,较好的渗透性,优越的拉伸强度,好的尺度稳定性和再湿后纵向收缩至少2%,高达7%。
本发明也包括制造上述膜的方法或工艺。尤其此方法包括:
从粘胶挤压成管;
管凝结于包括酸和盐的凝结浴槽中以形成再生纤维素管状膜;
于湿态下,纵向拉伸此膜从约8%到40%,同时横向拉伸此膜由-20%到+20%,联合纵向和横向拉伸足以较刚再生后的膜增加表面积至少10%;同时在干燥过程中维持所述联合拉伸,以形成具有未联合拉伸前相同管状膜壁厚的60%到90%壁厚的干燥管形膜。
依据本发明,管状材料10包括再生纤维素11。管膜作为包装和包裹材料有多种用途。如此管可劈开成膜,具有基本与赛璐玢(cellophane)膜相同的用途。此管形材料特别适用于食品如香肠和奶酪的食品包装。
包装管膜是由挤出粘胶制成的,此粘胶可以是任何改性或未改性的纤维素溶液,如纤维素溶于氨基氧化物的溶液,或溶于氢氧化铜与氢氧化铵的混合物(铜氨加工),或纤维素的氨基甲烷酸酯溶液,然而粘胶通常是碱性纤维素与二硫化碳的反应产物(黄原酸酯)。粘胶或被挤压成管型,或浸渍一个管状纤维网。此管最好是未增强的,以便增强时不限制拉伸操作。
粘胶然后被再生。这些再生主要产生于一个或一个以上的酸和盐浴槽中,如黄原酸酯粘胶的情况。此处的再生是指干燥前于最后浴槽中达到的基本上完全的再生。据认为这样再生,造成在加工过程中被加至纤维素中的增溶基团(如黄原酸酯粘胶中的CS2和氨基甲烷酸酯粘胶中的氨基甲烷酸酯)至少被移除90%。此再生的膜在干燥前是自身支持和可伸展的。在溶剂加工过程中溶解未改性的纤维素,如溶于氨基氧化物中的溶液,再生是指于干燥前最后溶剂移除步骤而形成一个自身支持和可拉伸的膜。
再生后仍在湿态时,此管形材料被纵向拉伸从8%到40%,通常为10%到20%,而横向拉伸从-20%到+40%,通常是0%到10%。在再生实现之后联合拉伸足以提供至少+10%,优选至少+15%的表面积净增长。在干燥过程中维持此拉伸。通常管形材料中壁厚12为除在再生后没有在干燥期间保持着的联合拉伸外都是相同的管材的壁厚的约60%到约90%。
一般对于直径通常适合于包装热狗的食品包装管而言,包装管壁厚在14~25微米,通常在21~23微米之间。
此外本发明的食品包装管膜对烟燻和其他蒸汽的渗透性高出未按本发明拉伸的包装管膜约20%到50%。
尽管有明显较薄的壁,本发明包装管膜的其他物理特性却惊人地近似于,在很多情况下甚至优于未拉伸的包装管膜。例如依照本发明崩裂压力至少是未拉伸的包装管膜的88%,通常是至少95%。而纵向拉伸强度为未经如本文描述的拉伸的同样包装管膜的至少85%,一般至少为90%,而普遍高于100%。
本发明的食品包装管膜的独特方面是沿纵轴向的再湿收缩至少为2%,通常为3%,再湿长度与干燥的包装管膜长度一般相差-2%到-7%,更经常在-3%到-6%。
如下实施例作为说明而非限制本发明
实施例1
一般本发明的管状膜是按加工方框图2所示的如下步骤所制成:
1.从粘胶挤压成管;
2.在包含酸和盐的浴槽中凝结此管形成再生的纤维素管状膜;
3.在湿态下纵向拉伸此膜由+8%到+40%和横向拉伸此膜从-20%到+20%,所述横向拉伸为纵向拉伸的75%,在再生实现起始的联合纵向和横向拉伸足以增加膜表面积至少10%;以及
4.在干燥过程中维持所述的拉伸,形成一个干的管状膜,其壁厚等于其它方面相同但未经充分拉伸的管状膜的约60%到90%,该未经充分纵向和横向联合拉伸的膜的表面积增加不足10%,而纵向拉伸少于8%。
粘胶制备基本上如美国专利3,835,113所述(除非另外指明)并基本如美国专利2,999,756所述挤压和再生。模头适用于代码24的食品包装管(的温坯料平折宽度约25.4mm)。改变干燥后的牵引速率与经过凝结(再生)浴槽的速率相差-2.5%到30%。凝结(再生)浴槽含有浓度为每升132克的硫酸和浓度为每升253克的硫酸钠。为达到增塑目的,食品包装管膜两次通过一个含有甘油的贮槽使其甘油含量达到约15.4%。在挤出点上粘胶流足以产生成品薄膜,在未经拉伸的情况下其厚度为1密耳。挤出后用空气吹胀,膨胀直径到约20mm。
结果如表1所示,表1明确显示在干燥器中维持的纵向伸长效果。强度特性无明显改变,但包装管的厚度明显较小,而干燥后的纵向伸长大为降低。渗透性研究表明,在减少厚度的情况下有较好的渗透性。
表1中使用以下缩写:
BDG=干透厚度。干膜厚度以每10米长的纤维素克数计。
DFW=干燥平折宽度,0.24指代码24,用于工业,其宽度约为32.7mm。
gpm=每分钟加仑值。
实施例2~6
除了在制膜生产线末端调整牵引速度来改变纵向拉伸和调整空气吹入量来改变横向拉伸用以提供再生管状膜的不同的纵向和横向伸展的情况以外,操作按例1进行。结果如表2所示。这些结果清楚表明,减少膜厚40%以上可达到相对应的崩裂压力(联合拉伸60%可增加68%的表面积)。
表1
再生后纵向拉伸 -2.5%/STD -2.5%/STD 10% 10% 15% 15% 20% 20% 30% 30%
代码 24 24 24 24 24 24 24 24 24 24凝结后和干燥器中维持伸展 -2.5% -2.5% +10.0% +10.0% +15% +15% +20.0% +20.0% +30.0% +30.0%
凝结
温度 42.5 42.5 42.5 42.5 42.5 42.5 42.5 42.5 42.5 42.5
酸浓度 132 132 132 132 132 132 132 132 132 132
盐浓度 253 253 253 253 253 253 253 253 253 253
BDG 19 19 16.9 16.9 16.1 16.1 15.4 15.4 14.3 14.3
DFW 厚24 厚24 厚24 厚24 厚24 厚24 厚24 厚24 厚24 厚24过甘油槽次数 2 2 2 2 2 2 2 2 2 2
外形
时间PIV转/分钟 73.5 73.3包装管膜分析
BDG 19.2 19.1 17 17.1 16.2 16.3 15.8 15.6 14.5 14.7由标准19BDG变化% 1.1 0.5 -10.5 -10 -14.7 -14.2 -16.8 -17.9 -23.7 -22.6
PH 9.2 9.3 9.3 9.3 9.2 9 9.1 9.1 9.3 9.2甘油% 15.7 15.6 15.7 15.7 15.3 15.1 15.7 15.7 15.9 15.6再湿崩裂压力 33.84 34.01 33.04 33.92 33.84 33.69 32.84 31.9 30.32 31.2脆裂直径 38.24 35.72 38.33 37.96 37.02 37.79 38.37 35.05 35.51 35.67再湿纵向拉伸强度试验膜厚度(英寸) 0.0017 0.0016 0.0016 0.0015 0.0015 0.0014 0.0014 0.0014破坏力1”(1bs) 6.04 6.29 5.74 5.7 5.94 6.13 6.59 6.12最大模量(psi) 14519 15733 23811 25394 30164 33830 39478 38551最大拉伸强度psi 7102 7861 7172 7617 7925 8758 9416 8743再湿横向Instrons试验膜厚度(英寸) 0.0017 0.0016 0.0016 0.0015 0.0015 0.0014 0.0014 0.0014破坏力1″(1bs) 10.170 10.660 9.73 9.73 9.29 8.5 7.72 8.7最大模量(psi) 8831 9531 8982 9642 9276 9791 9370 9493最大拉伸强度(psi) 6007 6661 6086 6503 6195 6092 5516 6212
表2检测部件 挤压代码 干燥代码 再生后拉伸% 挤压FW(mm) 干燥端FW(mm) 横向拉伸% 基重G/M2 厚度 再湿长度 崩裂压 脆裂直径
(mm) 变化% 力CMHg (mm)
A 24 19 +40% 33.7 27 -20 25.4 0.023 -4.8 29.5 39
B 24 25 +40% 33.7 33.7 0 20.3 0.017 -6.2 28.4 38.6
C 24 30 +40% 33.7 40.5 +20 16.9 0.014 -6.4 28.9 41.8
STD 24 24 STD(-2.5) 33.7 32.3 -4.2 29.4 0.025 -0.2 30.34 43.4
STD 30 30 STD(-2.5) 44 41 -7 31.0 0.025 -0.5 25.7 40.4
Claims (12)
1.一种包含由纤维素溶液再生和干燥的材料的管状膜,其特征在于再生后所述管状膜在温态下被纵向拉伸8%到40%,同时横向拉伸-20%到+40%,所述拉伸在干燥过程中被维持,联合纵向和横向拉伸足以使管状膜的表面积较再生后增加至少10%,所述管状膜具有相当于未经所述联合拉伸的管状膜的厚度的约60%到90%的壁厚。
2.权利要求1的管状膜,其特征是横向拉伸-20%到+20%。
3.权利要求1的管状膜,其特征是被纵向拉伸从10%到20%。
4.权利要求1的管状膜,其特征是壁的厚度从18到25微米。
5.权利要求4的管状膜,其特征是壁厚从21到23微米。
6.权利要求1的管状膜,其特征是具有渗透性大于未经所述联合拉伸的同样膜达20%到50%。
7.权利要求1的管状膜,其特征是此膜具有未经所述联合拉伸的同样膜的至少88%的崩裂压力。
8.权利要求1的管状膜,其特征是当再湿时该管材的纵向收缩至少在3%。
9.权利要求1的管状膜,其特征是其纤维素溶液是黄原酸酯粘胶。
10.制造权利要求1的管状膜的方法,该方法包括;
从纤维素溶液挤压成管;和
在包含酸和盐的凝结浴槽中凝结形成再生纤维素管状膜,其特征在于再生后此膜在湿态下被纵向拉伸从8%到40%,同时被横向拉伸从-20%到+40%,联合纵向和横向拉伸足以使膜较之刚刚再生后增加表面积至少10%;和在于燥过程中维持所述拉伸,使形成一种干燥管状膜,具有未经所述联合拉伸的同样管膜壁厚的60%到90%的壁厚。
11.权利要求10的方法,其特征是此膜是被横向拉伸从-20%到+20%。
12.权利要求10的方法,其特征是纤维素溶液为黄原酸酯粘胶。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US797,766 | 1997-02-07 | ||
US08/797,766 US5952064A (en) | 1995-12-06 | 1997-02-07 | Stretched tubular film for holding foodstuff |
Publications (2)
Publication Number | Publication Date |
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CN1190075A CN1190075A (zh) | 1998-08-12 |
CN1061623C true CN1061623C (zh) | 2001-02-07 |
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CN97113053A Expired - Fee Related CN1061623C (zh) | 1997-02-07 | 1997-05-29 | 食品包装用的伸展性管状膜 |
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US (1) | US5952064A (zh) |
EP (1) | EP0857423A1 (zh) |
JP (1) | JPH10217327A (zh) |
CN (1) | CN1061623C (zh) |
BR (1) | BR9703329A (zh) |
CA (1) | CA2205620A1 (zh) |
HK (1) | HK1011854A1 (zh) |
RU (1) | RU2158088C2 (zh) |
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US6630214B1 (en) | 1999-11-17 | 2003-10-07 | Viskase Corporation | Improving rewet shrink properties of casing |
CN114476221A (zh) * | 2022-03-01 | 2022-05-13 | 保定全乐生物科技有限公司 | 一种火腿肠式包装血制品及其灌装设备 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN1088225A (zh) * | 1992-12-18 | 1994-06-22 | 中国国际科技促进会 | 植物纤维素薄膜制品及其工艺 |
EP0662283A2 (en) * | 1994-01-10 | 1995-07-12 | Viskase Corporation | Cellulose food casing manufacturing method |
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GB793789A (en) * | 1954-12-22 | 1958-04-23 | British Cellophane Ltd | Improvements in or relating to the production of artificial sausage casings |
US2901358A (en) * | 1958-02-25 | 1959-08-25 | Union Carbide Corp | Method for producing artificial food casing |
US2999756A (en) * | 1959-06-22 | 1961-09-12 | Union Carbide Corp | Method for producing cellulosic sausage casings and product |
US2999757A (en) * | 1959-10-30 | 1961-09-12 | Union Carbide Corp | Method for producing cellulosic sausage casings and product |
US3835113A (en) * | 1972-12-26 | 1974-09-10 | Tee Pak Inc | Preparation of viscose |
DE3030036A1 (de) * | 1980-08-08 | 1982-05-06 | Hoechst Ag, 6000 Frankfurt | Schlauchfoermige verpackungshuelle aus cellulosehydrat mit wasserdampfungurchlaesigem filmueberzug aus synthetischem polymerisat auf der aussen- und haftvermittelnder, fuer wasser durchlaessiger schicht aus synthetischem, waermegehaertetem chemischem kondensationsprodukt auf der innenseite |
DE3045086A1 (de) * | 1980-11-29 | 1982-06-24 | Hoechst Ag, 6000 Frankfurt | Schlauchhuelle, insbesondere wursthuelle, mit wasserdampfundurchlaessiger schicht, verfahren zu ihrer herstellung und ihre verwendung |
US4590107A (en) * | 1981-02-06 | 1986-05-20 | Teepak, Inc. | Thin-walled, low plasticized content regenerated cellulose sausage casing |
WO1982002649A1 (en) * | 1981-02-06 | 1982-08-19 | Douglas J Bridgeford | Thin-walled,low plasticizer content regenerated cellulose sausage casing |
DE3631669A1 (de) * | 1986-09-18 | 1988-03-24 | Hoechst Ag | Verstaerkungsfreie folie aus cellulose |
US5658524A (en) * | 1992-01-17 | 1997-08-19 | Viskase Corporation | Cellulose article manufacturing method |
US6120861A (en) * | 1995-12-06 | 2000-09-19 | Teepak Investments Inc. | Stretched tubular film for holding foodstuff |
-
1997
- 1997-02-07 US US08/797,766 patent/US5952064A/en not_active Expired - Fee Related
- 1997-05-16 CA CA002205620A patent/CA2205620A1/en not_active Abandoned
- 1997-05-21 RU RU97108093/13A patent/RU2158088C2/ru active
- 1997-05-24 EP EP97108421A patent/EP0857423A1/en not_active Withdrawn
- 1997-05-28 BR BR9703329-4A patent/BR9703329A/pt active Search and Examination
- 1997-05-29 CN CN97113053A patent/CN1061623C/zh not_active Expired - Fee Related
- 1997-05-30 JP JP9141856A patent/JPH10217327A/ja active Pending
-
1998
- 1998-12-10 HK HK98113133A patent/HK1011854A1/xx not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN1088225A (zh) * | 1992-12-18 | 1994-06-22 | 中国国际科技促进会 | 植物纤维素薄膜制品及其工艺 |
EP0662283A2 (en) * | 1994-01-10 | 1995-07-12 | Viskase Corporation | Cellulose food casing manufacturing method |
Also Published As
Publication number | Publication date |
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MX9704023A (es) | 1998-08-30 |
BR9703329A (pt) | 2000-12-19 |
CN1190075A (zh) | 1998-08-12 |
CA2205620A1 (en) | 1998-08-07 |
US5952064A (en) | 1999-09-14 |
JPH10217327A (ja) | 1998-08-18 |
EP0857423A1 (en) | 1998-08-12 |
HK1011854A1 (en) | 1999-07-23 |
RU2158088C2 (ru) | 2000-10-27 |
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