CN108193562A - 一种食品包装用可降解白卡纸的制备方法 - Google Patents
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Abstract
本发明涉及造纸技术领域,具体涉及一种食品包装用可降解白卡纸的制备方法。本发明将自制的混合基料、自制的分散淀粉料和乳酸菌混合发酵,并将发酵产物离心处理得到粘稠沉淀物,将粘稠沉淀物与自制的乌拉草纤维混合抄制得到面纸层,对面纸层喷洒贝壳粉后压延得到可降解白卡纸,所用的乌拉草纤维,可作用于细菌细胞壁和原生质膜,阻止营养物质向细胞内运输,白卡纸中所含的聚乳酸具有抗菌防霉的功能,从而使白卡纸具有极佳的抗菌性能,聚乳酸还具有柔软坚韧的特性,可以提高白卡纸的抗弯折性能,白卡纸内部聚乳酸主链上含有易水解的酯键,它属于聚酯类高分子材料,使白卡纸具有良好的降解性能,在绿色环保方面具有重大意义,应用前景广阔。
Description
技术领域
本发明涉及造纸技术领域,具体涉及一种食品包装用可降解白卡纸的制备方法。
背景技术
纸是我国古代的一个伟大发明,给中国古代文化的繁荣提供了物质技术的基础,纸的出现为人类的生活、学习带来了极大的便利。
白卡纸是一种较厚实、纯优质木浆制成的白色卡纸,经压光或压纹处理制造出来的一种纸张,具有较为均匀的吸墨性、较高的挺度、较好的耐破度以及较好的平滑度等优点。白卡纸是一种应用极为广泛的包装用纸,主要用于商品包装盒、商品表衬、画片挂图等,此外名片印刷、证书、请柬、封皮、台历、邮政明信片等也多用该纸。
但是,目前国内市场上的白卡纸都是以进口为主,并且国内生产厂家大部分采用进口木浆生产,其生产成本相对比较高。现有的白卡纸自身也存在一些问题,比如:1、耐弯折性差,弯折后极易产生针孔或裂痕,进而影响了材料的阻气性和阻湿性;2、抗菌功能差,特别是用于食品包装的白卡纸,不利于身体健康;3、阻燃性差,容易产生火灾,给社会造成损失等。另外,此类材料的包装废弃物难以回收或降解,在一定程度上造成了环境污染,并存在了一系列的安全隐患。
因此,研制出一种能够解决上述性能问题的白卡纸非常有必要。
发明内容
本发明主要解决的技术问题,针对目前白卡纸用于食品包装行业,抗菌功能差,不利于人体健康以及白卡纸难以降解,不易回收处理的缺陷,提供了一种食品包装用可降解白卡纸的制备方法。
为了解决上述技术问题,本发明所采用的技术方案是:
一种食品包装用可降解白卡纸的制备方法,其特征在于具体制备步骤为:
(1)将300~350g玉米置于400~500mL亚硫酸溶液中浸泡,取出浸泡后的玉米,将玉米置于盘式破碎机中破碎,得到玉米糊,将玉米糊过离心筛后,得到过筛玉米糊,置于烘箱中加热升温,干燥,得到粗玉米淀粉;
(2)将粗玉米淀粉置于耙式真空干燥机中,加热升温,真空干燥2~3h,得到干燥玉米淀粉,将干燥玉米淀粉、甘油和水混合,置于高速分散机中分散得到分散淀粉料;
(3)将针叶木放入木材粉碎机粉碎,过标准筛,得到过筛木粉,将过筛木粉放入烘箱中干燥,用干燥后的过筛木粉配制木浆置于烧杯中,搅拌后,将纸浆与羟甲基纤维素混合得到混合浆液,将混合浆液置于真空泵中抽滤,直至无水滴落下,得到混合基料;
(4)取100~120g乌拉草放入400~450mL硫酸溶液中浸泡,得到酸浸处理的乌拉草,将酸浸处理的乌拉草置于水浴锅中,加热升温,向水浴锅中加入100~120mL氢氧化钠溶液、50~60mL多聚磷酸钠溶液和30~40mL硅酸钠溶液,蒸煮后,过滤,去除滤液得到乌拉草纤维;
(5)按重量份数计,将30~40份混合基料、40~50份分散淀粉料、20~25份水和5~10份乳酸菌置于密封发酵罐中,静置,得到发酵产物,将发酵产物置于高速离心机中离心处理,去除上层清液得到下层粘稠沉淀物;
(6)将粘稠沉淀物与乌拉草纤维置于高速分散机中转速高速分散得到抄纸原料,将抄纸原料放入纸叶成型器中抄制得到面纸层,对面纸层两面喷撒贝壳粉后,转移至压延机中压延处理,得到食品包装用可降解白卡纸。
步骤(1)所述的亚硫酸溶液的质量分数为0.8%,浸泡时间为6~8h,破碎时间为1~2h,离心筛的筛孔直径为0.06~0.08mm,加热升温后温度为80~85℃,干燥时间为4~5h。
步骤(2)所述的加热升温后温度为100~105℃,真空干燥时间为2~3h,干燥玉米淀粉、甘油和水混合的质量比10︰5︰1,高速分散机转速为3000~3500r/min,分散时间为10~15min。
步骤(3)所述的粉碎时间为30~50min,所过标准筛规格为80目,得到过筛木粉,烘箱设定温度为100~120℃,干燥时间为3~5h,木浆质量分数为20%,搅拌时间为40~45min,纸浆与羟甲基纤维素混合的质量比为10︰1。
步骤(4)所述的质量分数为30%硫酸溶液,浸泡时间为1~2h,控制浸泡温度为50~55℃,加热升温后温度为90~100℃,氢氧化钠溶液的质量分数为40%,多聚磷酸钠溶的质量分数为4%,硅酸钠溶液的质量分数为6%,蒸煮时间为2~3h。
步骤(5)所述的控制发酵温度为40~50℃,静置时间为6~7天,高速离心机转速为3000~4000r/min,离心处理时间为5~10min。
步骤(6)所述的高速分散机中转速为4000~5000r/min,面纸层的厚度为0.4~0.6mm,贝壳粉喷撒厚度为0.1~0.2mm。
本发明的有益效果是:
(1)本发明以玉米为原料,经亚硫酸溶液浸泡、破碎得到玉米糊,再过筛分离、干燥得到粗玉米淀粉,将粗玉米淀粉放入淀粉耙式真空干燥机干燥处理得到干燥玉米淀粉后,与甘油、水按一定质量比分散得到分散淀粉料,将针叶木粉碎、过筛后配制成木浆,将木浆与羟甲基纤维素混合分散、抽滤得到混合基料,以乌拉草为原料经酸浸碱煮、过滤得到乌拉草纤维,先将混合基料、分散淀粉料、乳酸菌混合发酵,接着将发酵产物离心处理得到粘稠沉淀物,最后将粘稠沉淀物与乌拉草纤维混合抄制得到面纸层,对面纸层喷洒贝壳粉后压延得到食品包装用可降解白卡纸,本发明所用乌拉草纤维中含有四羟基黄酮类物质木犀草素,可作用于细菌细胞壁和原生质膜中,使其结构发生变化,导致细胞壁破裂或缺失,胞内容物流出从而影响膜的通透性,当细胞出现空腔,其结构和功能被破坏,营养物质无法向细胞内运输,造成细胞质壁分离现象,最终内容物外泄而使细菌死亡,淀粉分解的葡萄糖经过发酵后产生乳酸,乳酸在木浆纤维中聚合产生聚乳酸,聚乳酸本身具有抗菌防霉的功能,从而使白卡纸具有极佳的抗菌性能;
(2)本发明中白卡纸所含的聚乳酸具有柔软坚韧的特性,可以提高白卡纸的抗弯折性能,人体中也含有乳酸,所以两者具有很好的生物相容性,因此并不会对人体健康产生危害,面纸层表面喷洒的贝壳粉不仅能增强白卡纸表面强度,而且贝壳粉中壳聚糖也能起到一定抗菌效果,使白卡纸具备一定的防霉性能,白卡纸内部聚乳酸主链上含有易水解的酯键,它属于聚酯类高分子材料,聚乳酸的水解过程首先起始于水的吸收,小分子的水移动到缓冲包装材料的表面,通过扩散的方式进入亲水基团或酯键的周围,在酸性或碱性环境下,酯键都会发生自由水解断裂,分子量缓慢降低,当分子量降低到一定程度,开始溶解,变成可溶的降解产物,从而使缓冲包装材料具有良好的降解性能,在绿色环保方面具有重大意义,应用前景广阔。
具体实施方式
将300~350g玉米置于400~500mL质量分数为0.8%的亚硫酸溶液中浸泡6~8h,取出浸泡后的玉米,将玉米置于盘式破碎机中破碎1~2h,得到玉米糊,将玉米糊过筛孔直径为0.06~0.08mm的离心筛后,得到过筛玉米糊,置于烘箱中加热升温至80~85℃,干燥4~5h,得到粗玉米淀粉;将粗玉米淀粉置于耙式真空干燥机中,加热升温至100~105℃,真空干燥2~3h,得到干燥玉米淀粉,将干燥玉米淀粉、甘油和水按质量比10︰5︰1混合,置于高速分散机中以3000~3500r/min的转速分散10~15min得到分散淀粉料;将针叶木放入木材粉碎机粉碎30~50min,过80目标准筛,得到过筛木粉,将过筛木粉放入温度为100~120℃的烘箱中干燥3~5h,用干燥后的过筛木粉配制质量分数为20%的木浆置于烧杯中,搅拌40~45min后,将纸浆与羟甲基纤维素按质量比为10︰1混合得到混合浆液,将混合浆液置于真空泵中抽滤,直至无水滴落下,得到混合基料;取100~120g乌拉草放入400~450mL质量分数为30%的硫酸溶液中浸泡1~2h,控制浸泡温度为50~55℃,得到酸浸处理的乌拉草,将酸浸处理的乌拉草置于水浴锅中,加热升温至90~100℃,向水浴锅中加入100~120mL质量分数为40%的氢氧化钠溶液、50~60mL质量分数为4%的多聚磷酸钠溶液和30~40mL质量分数为6%的硅酸钠溶液,蒸煮2~3h后,过滤,去除滤液得到乌拉草纤维;按重量份数计,将30~40份混合基料、40~50份分散淀粉料、20~25份水和5~10份乳酸菌置于密封发酵罐中,控制温度为40~50℃,静置6~7天,得到发酵产物,将发酵产物置于高速离心机中,以3000~4000r/min的转速离心处理5~10min,去除上层清液得到下层粘稠沉淀物;将粘稠沉淀物与乌拉草纤维置于高速分散机中以4000~5000r/min的转速高速分散得到抄纸原料,将抄纸原料放入纸叶成型器中抄制得到厚度为0.4~0.6mm的面纸层,对面纸层两面喷撒厚度为0.1~0.2mm的贝壳粉后,转移至压延机中压延处理,得到食品包装用可降解白卡纸。
实例1
将300g玉米置于400mL质量分数为0.8%的亚硫酸溶液中浸泡6h,取出浸泡后的玉米,将玉米置于盘式破碎机中破碎1h,得到玉米糊,将玉米糊过筛孔直径为0.06mm的离心筛后,得到过筛玉米糊,置于烘箱中加热升温至80℃,干燥4h,得到粗玉米淀粉;将粗玉米淀粉置于耙式真空干燥机中,加热升温至100℃,真空干燥2h,得到干燥玉米淀粉,将干燥玉米淀粉、甘油和水按质量比10︰5︰1混合,置于高速分散机中以3000r/min的转速分散10min得到分散淀粉料;将针叶木放入木材粉碎机粉碎30min,过80目标准筛,得到过筛木粉,将过筛木粉放入温度为100℃的烘箱中干燥3h,用干燥后的过筛木粉配制质量分数为20%的木浆置于烧杯中,搅拌40min后,将纸浆与羟甲基纤维素按质量比为10︰1混合得到混合浆液,将混合浆液置于真空泵中抽滤,直至无水滴落下,得到混合基料;取100g乌拉草放入400mL质量分数为30%的硫酸溶液中浸泡1h,控制浸泡温度为50℃,得到酸浸处理的乌拉草,将酸浸处理的乌拉草置于水浴锅中,加热升温至90℃,向水浴锅中加入100mL质量分数为40%的氢氧化钠溶液、50mL质量分数为4%的多聚磷酸钠溶液和30mL质量分数为6%的硅酸钠溶液,蒸煮2h后,过滤,去除滤液得到乌拉草纤维;按重量份数计,将30份混合基料、40份分散淀粉料、20份水和5份乳酸菌置于密封发酵罐中,控制温度为40℃,静置6天,得到发酵产物,将发酵产物置于高速离心机中,以3000r/min的转速离心处理5min,去除上层清液得到下层粘稠沉淀物;将粘稠沉淀物与乌拉草纤维置于高速分散机中以4000r/min的转速高速分散得到抄纸原料,将抄纸原料放入纸叶成型器中抄制得到厚度为0.4mm的面纸层,对面纸层两面喷撒厚度为0.1mm的贝壳粉后,转移至压延机中压延处理,得到食品包装用可降解白卡纸。
实例2
将325g玉米置于450mL质量分数为0.8%的亚硫酸溶液中浸泡7h,取出浸泡后的玉米,将玉米置于盘式破碎机中破碎1.5h,得到玉米糊,将玉米糊过筛孔直径为0.07mm的离心筛后,得到过筛玉米糊,置于烘箱中加热升温至83℃,干燥4.5h,得到粗玉米淀粉;将粗玉米淀粉置于耙式真空干燥机中,加热升温至103℃,真空干燥2.5h,得到干燥玉米淀粉,将干燥玉米淀粉、甘油和水按质量比10︰5︰1混合,置于高速分散机中以3250r/min的转速分散13min得到分散淀粉料;将针叶木放入木材粉碎机粉碎35min,过80目标准筛,得到过筛木粉,将过筛木粉放入温度为110℃的烘箱中干燥4h,用干燥后的过筛木粉配制质量分数为20%的木浆置于烧杯中,搅拌43min后,将纸浆与羟甲基纤维素按质量比为10︰1混合得到混合浆液,将混合浆液置于真空泵中抽滤,直至无水滴落下,得到混合基料;取110g乌拉草放入425mL质量分数为30%的硫酸溶液中浸泡1.5h,控制浸泡温度为53℃,得到酸浸处理的乌拉草,将酸浸处理的乌拉草置于水浴锅中,加热升温至95℃,向水浴锅中加入110mL质量分数为40%的氢氧化钠溶液、55mL质量分数为4%的多聚磷酸钠溶液和35mL质量分数为6%的硅酸钠溶液,蒸煮2.5h后,过滤,去除滤液得到乌拉草纤维;按重量份数计,将35份混合基料、45份分散淀粉料、23份水和7份乳酸菌置于密封发酵罐中,控制温度为45℃,静置6天,得到发酵产物,将发酵产物置于高速离心机中,以3500r/min的转速离心处理7min,去除上层清液得到下层粘稠沉淀物;将粘稠沉淀物与乌拉草纤维置于高速分散机中以4500r/min的转速高速分散得到抄纸原料,将抄纸原料放入纸叶成型器中抄制得到厚度为0.5mm的面纸层,对面纸层两面喷撒厚度为0.1mm的贝壳粉后,转移至压延机中压延处理,得到食品包装用可降解白卡纸。
实例3
将350g玉米置于500mL质量分数为0.8%的亚硫酸溶液中浸泡8h,取出浸泡后的玉米,将玉米置于盘式破碎机中破碎2h,得到玉米糊,将玉米糊过筛孔直径为0.08mm的离心筛后,得到过筛玉米糊,置于烘箱中加热升温至85℃,干燥5h,得到粗玉米淀粉;将粗玉米淀粉置于耙式真空干燥机中,加热升温至105℃,真空干燥3h,得到干燥玉米淀粉,将干燥玉米淀粉、甘油和水按质量比10︰5︰1混合,置于高速分散机中以3500r/min的转速分散15min得到分散淀粉料;将针叶木放入木材粉碎机粉碎50min,过80目标准筛,得到过筛木粉,将过筛木粉放入温度为120℃的烘箱中干燥5h,用干燥后的过筛木粉配制质量分数为20%的木浆置于烧杯中,搅拌45min后,将纸浆与羟甲基纤维素按质量比为10︰1混合得到混合浆液,将混合浆液置于真空泵中抽滤,直至无水滴落下,得到混合基料;取120g乌拉草放入450mL质量分数为30%的硫酸溶液中浸泡2h,控制浸泡温度为55℃,得到酸浸处理的乌拉草,将酸浸处理的乌拉草置于水浴锅中,加热升温至100℃,向水浴锅中加入120mL质量分数为40%的氢氧化钠溶液、60mL质量分数为4%的多聚磷酸钠溶液和40mL质量分数为6%的硅酸钠溶液,蒸煮3h后,过滤,去除滤液得到乌拉草纤维;按重量份数计,将40份混合基料、50份分散淀粉料、25份水和10份乳酸菌置于密封发酵罐中,控制温度为50℃,静置7天,得到发酵产物,将发酵产物置于高速离心机中,以4000r/min的转速离心处理10min,去除上层清液得到下层粘稠沉淀物;将粘稠沉淀物与乌拉草纤维置于高速分散机中以5000r/min的转速高速分散得到抄纸原料,将抄纸原料放入纸叶成型器中抄制得到厚度为0.6mm的面纸层,对面纸层两面喷撒厚度为0.2mm的贝壳粉后,转移至压延机中压延处理,得到食品包装用可降解白卡纸。
对比例 以珠海市某公司生产的白卡纸作为对比例 对本发明制得的食品包装用可降解白卡纸和对比例中的白卡纸进行检测,检测结果如表1所示: 1、抑菌性测试
纸张的抑菌效果采用振荡烧瓶法进行试验。取4张本发明制备的实例1~3和对比例样品(纸张质量为0.75g,大小为10mm×10mm),放入250mL的三角烧瓶中,分别加入70mLPBS和5mL菌悬液,记为A、B、C、D。将三角烧瓶固定在振荡摇床上,在作用温度为20~25℃条件下,以300r/min振荡2min。吸取1.0mLPBS,作为试验组振荡前样液。继续振摇1h后吸取1.0mL样液。分别吸取振荡前和震荡后样液各1.0mL,以琼脂倾注法接近平皿,每个液样接种两个平皿,翻转平皿,置37℃培养箱内40h。按照规定的方法进行活菌培养计数,算出抑菌率。
抑菌率=(样品振荡前平均菌落数-样品振荡后平均菌落数)/样品振荡前平均菌落数
2、生物降解性测试
利用土壤微生物自然降解。将本发明制备的实例1~3和对比例样品埋在土壤15cm深处,第15天进行检验,观察记录。
表1
测试项目 | 实例1(A) | 实例2(B) | 实例3(C) | 对比例(D) |
抑菌率(%) | 92.6 | 93.4 | 94.9 | 70.2 |
生物降解性(%) | 95 | 97 | 98 | 65 |
根据表1中数据可知,本发明制得的食品包装用可降解白卡纸,抑菌率高,可生物降解性好,不会对人体产生危害,更不会对环境造成污染,明显优于对比例样品。因此,具有广阔的使用前景。
Claims (7)
1.一种食品包装用可降解白卡纸的制备方法,其特征在于具体制备步骤为:
(1)将300~350g玉米置于400~500mL亚硫酸溶液中浸泡,取出浸泡后的玉米,将玉米置于盘式破碎机中破碎,得到玉米糊,将玉米糊过离心筛后,得到过筛玉米糊,置于烘箱中加热升温,干燥,得到粗玉米淀粉;
(2)将粗玉米淀粉置于耙式真空干燥机中,加热升温,真空干燥2~3h,得到干燥玉米淀粉,将干燥玉米淀粉、甘油和水混合,置于高速分散机中分散得到分散淀粉料;
(3)将针叶木放入木材粉碎机粉碎,过标准筛,得到过筛木粉,将过筛木粉放入烘箱中干燥,用干燥后的过筛木粉配制木浆置于烧杯中,搅拌后,将纸浆与羟甲基纤维素混合得到混合浆液,将混合浆液置于真空泵中抽滤,直至无水滴落下,得到混合基料;
(4)取100~120g乌拉草放入400~450mL硫酸溶液中浸泡,得到酸浸处理的乌拉草,将酸浸处理的乌拉草置于水浴锅中,加热升温,向水浴锅中加入100~120mL氢氧化钠溶液、50~60mL多聚磷酸钠溶液和30~40mL硅酸钠溶液,蒸煮后,过滤,去除滤液得到乌拉草纤维;
(5)按重量份数计,将30~40份混合基料、40~50份分散淀粉料、20~25份水和5~10份乳酸菌置于密封发酵罐中,静置,得到发酵产物,将发酵产物置于高速离心机中离心处理,去除上层清液得到下层粘稠沉淀物;
(6)将粘稠沉淀物与乌拉草纤维置于高速分散机中转速高速分散得到抄纸原料,将抄纸原料放入纸叶成型器中抄制得到面纸层,对面纸层两面喷撒贝壳粉后,转移至压延机中压延处理,得到食品包装用可降解白卡纸。
2.根据权利要求1所述的一种食品包装用可降解白卡纸的制备方法,其特征在于:
步骤(1)所述的亚硫酸溶液的质量分数为0.8%,浸泡时间为6~8h,破碎时间为1~2h,离心筛的筛孔直径为0.06~0.08mm,加热升温后温度为80~85℃,干燥时间为4~5h。
3.根据权利要求1所述的一种食品包装用可降解白卡纸的制备方法,其特征在于:
步骤(2)所述的加热升温后温度为100~105℃,真空干燥时间为2~3h,干燥玉米淀粉、甘油和水混合的质量比10︰5︰1,高速分散机转速为3000~3500r/min,分散时间为10~15min。
4.根据权利要求1所述的一种食品包装用可降解白卡纸的制备方法,其特征在于:
步骤(3)所述的粉碎时间为30~50min,所过标准筛规格为80目,得到过筛木粉,烘箱设定温度为100~120℃,干燥时间为3~5h,木浆质量分数为20%,搅拌时间为40~45min,纸浆与羟甲基纤维素混合的质量比为10︰1。
5.根据权利要求1所述的一种食品包装用可降解白卡纸的制备方法,其特征在于:
步骤(4)所述的质量分数为30%硫酸溶液,浸泡时间为1~2h,控制浸泡温度为50~55℃,加热升温后温度为90~100℃,氢氧化钠溶液的质量分数为40%,多聚磷酸钠溶的质量分数为4%,硅酸钠溶液的质量分数为6%,蒸煮时间为2~3h。
6.根据权利要求1所述的一种食品包装用可降解白卡纸的制备方法,其特征在于:
步骤(5)所述的控制发酵温度为40~50℃,静置时间为6~7天,高速离心机转速为3000~4000r/min,离心处理时间为5~10min。
7.根据权利要求1所述的一种食品包装用可降解白卡纸的制备方法,其特征在于:
步骤(6)所述的高速分散机中转速为4000~5000r/min,面纸层的厚度为0.4~0.6mm,贝壳粉喷撒厚度为0.1~0.2mm。
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CN113564968A (zh) * | 2021-07-23 | 2021-10-29 | 上海格森纸业有限责任公司 | 一种用于牙签的包装的牙签纸双耳册子生产工艺 |
CN113897815A (zh) * | 2021-10-28 | 2022-01-07 | 山东天和纸业有限公司 | 一种提高食品包装纸耐破度的方法及其设备 |
CN115450069A (zh) * | 2022-08-26 | 2022-12-09 | 珠海红塔仁恒包装股份有限公司 | 一种吸水白卡纸及其制备方法与应用 |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113564968A (zh) * | 2021-07-23 | 2021-10-29 | 上海格森纸业有限责任公司 | 一种用于牙签的包装的牙签纸双耳册子生产工艺 |
CN113897815A (zh) * | 2021-10-28 | 2022-01-07 | 山东天和纸业有限公司 | 一种提高食品包装纸耐破度的方法及其设备 |
CN115450069A (zh) * | 2022-08-26 | 2022-12-09 | 珠海红塔仁恒包装股份有限公司 | 一种吸水白卡纸及其制备方法与应用 |
CN115450069B (zh) * | 2022-08-26 | 2023-05-12 | 珠海红塔仁恒包装股份有限公司 | 一种吸水白卡纸及其制备方法与应用 |
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