CN111657343B - 一种果蔬保鲜瓦楞纸箱及其制备方法 - Google Patents
一种果蔬保鲜瓦楞纸箱及其制备方法 Download PDFInfo
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Abstract
一种果蔬保鲜瓦楞纸箱,其纸板内表面涂覆有多孔淀粉保鲜涂料层,多孔淀粉保鲜涂料层的原料组成及其重量份比包括:多孔淀粉40–50、蒸馏水350–450、孔径为2.8–3.0A的碳分子筛粉50–60,纸板外表面覆有聚合物微孔纤维膜,聚合物微孔纤维膜的原料组成及其重量份比包括:β晶型聚丙烯颗粒80–100、孔径为2.8–3.0A的碳分子筛粉32–40。本设计有效提高了纸箱的保鲜、防水、透气性能。
Description
技术领域
本发明属于瓦楞纸箱生产技术领域,具体涉及一种果蔬保鲜瓦楞纸箱及其制备方法,该瓦楞纸箱从果蔬装箱时就能抑制果蔬的呼吸作用,使果蔬不能加速成熟,在储运的过程中始终保持新鲜度。
背景技术
随着经济的不断发展,消费者对于果蔬的需求也越来越多样化。由于果蔬生产的地域性和季节性较强,加上保鲜产业的不足,致使绝大部分消费者不可能在第一时间品尝到新鲜水果,如何在储运的同时维持果蔬鲜度成了人们越来越关注的关键问题。目前在果蔬的储运过程中,瓦楞纸箱占据较大比重,瓦楞纸箱方便快捷,便于堆放,在果蔬储运过程中起到很重要。但在储运过程中,保鲜效果不尽满意,达不到所需保鲜预期,特别是存放环境恶劣的情况下,果蔬的损坏变质速度非常快,包装纸箱不能保证果蔬的新鲜度,造成了大量的损失。为此,市场上开发出了多种保鲜瓦楞纸箱,大部分是采用放置保鲜剂、气体吸收剂、纸箱开口等措施,这些措施都是通过果蔬氧化成熟开始后延缓成熟过程,在一定程度上增加果蔬存放时间,起到了一定的保鲜作用,但果蔬的保鲜度打了折扣,尤其是装箱时已经开始成熟的果蔬,保鲜效果更是不太理想。
发明内容
本发明的目的是针对现有技术存在的上述问题,提供一种保鲜性能优良的果蔬保鲜瓦楞纸箱及其制备方法。
为实现以上目的,本发明提供了以下技术方案:
一种果蔬保鲜瓦楞纸箱,其纸板内表面涂覆有多孔淀粉保鲜涂料层,所述多孔淀粉保鲜涂料层的原料组成及其重量份比包括:多孔淀粉40–50、蒸馏水350–450、孔径为2.8–3.0A的碳分子筛粉50–60。
所述多孔淀粉保鲜涂料层的原料组成还包括苯丙乳液、硫酸钙晶须、硼砂、增稠剂,所述苯丙乳液、硫酸钙晶须、硼砂、增稠剂与多孔淀粉的重量份比为80–100:2–4:1–2:1–2:40–50。
所述瓦楞纸箱的纸板外表面覆有聚合物微孔纤维膜,所述聚合物微孔纤维膜的原料组成及其重量份比包括:β晶型聚丙烯颗粒80–100、孔径为2.8–3.0A的碳分子筛粉32–40。
所述聚合物微孔纤维膜的原料组成还包括硫酸钙晶须、10号白油,所述硫酸钙晶须、10号白油与β晶型聚丙烯颗粒的重量份比为1–2:0.05–0.08:80–100。
所述多孔淀粉保鲜涂料层的厚度为2–3mm,所述聚合物微孔纤维膜的厚度为0.1–0.2mm。
所述瓦楞纸箱上开设有由多个孔径为0.5–0.8mm的气孔组成的透气孔组,所述透气孔组的长度小于纸箱高度的1/4,透气孔组的宽度与其长度的比值为1/4–1/3。
上述果蔬保鲜瓦楞纸箱的制备方法,所述制备方法包括多孔淀粉保鲜涂料的制备方法,具体为:先将多孔淀粉、蒸馏水、碳分子筛粉按所需比例在80–90℃下混合均匀,然后充分研磨即得到多孔淀粉保鲜涂料。
所述瓦楞纸箱的纸板外表面覆有聚合物微孔纤维膜,所述聚合物微孔纤维膜的原料组成及其重量份比包括:β晶型聚丙烯颗粒80–100、孔径为2.8–3.0A的碳分子筛粉32–40;
所述制备方法还包括聚合物微孔纤维膜的制备方法,具体为:先将β晶型聚丙烯颗粒与碳分子筛粉常温混合,再排入到单螺杆挤出机中挤成片材,然后对片材依次在110–120℃单向热拉伸、110–140℃热定型,即得到聚合物微孔纤维膜。
所述β晶型聚丙烯颗粒采用以下方法制备得到:
先将聚丙烯T30S树脂加入高速混合机,边搅拌边加入10号白油,再加入β晶型成核剂、抗氧剂1010、抗氧剂168混合均匀后排入平行双螺杆挤出机中熔融挤出,然后依次进行水下模面切粒、粒子脱水、烘干操作即可,其中,所述聚丙烯T30S树脂、β晶型成核剂、抗氧剂1010、抗氧剂168、10号白油的重量比为80–100:1–2:0.2–0.3:0.2–0.3:0.05–0.08。
所述单螺杆挤出机的挤出工艺温度为:一区185±5℃、二区215±5℃、三区215±5℃、四区225±5℃、五区215±5℃、机头200±5℃;
所述单向热拉伸的应变速率为5m/min,拉伸范围为7-9倍;
所述热定型的时间为5–8min;
所述平行双螺杆挤出机的工作温度为:一区175±5℃,二区215±5℃,三区225±5℃,四区225±5℃,五区215±5℃,机头205±5℃。
与现有技术相比,本发明的有益效果为:
1、本发明一种果蔬保鲜瓦楞纸箱在纸板内表面涂覆有多孔淀粉保鲜涂料层,且多孔淀粉保鲜涂料层的原料组成及其重量份比包括:多孔淀粉40–50、蒸馏水350–450、孔径为2.8–3.0A的碳分子筛粉50–60,该涂料中添加有碳分子筛和多孔淀粉,一方面,由于碳分子筛的孔径与氧气的动力学直径相近,却小于氮气的动力学直径,当空气通过涂层时,其中的氮气可以通过,而氧气则会被碳分子筛所吸附,导致纸箱内部压力降低,在内外气压差的作用下,空气中的氮气会不断进入纸箱内部,从而使得纸箱内部的氮气浓度达到很高的水平,这种气氛会有效抑制果蔬的呼吸作用,使得纸箱具有优良的保鲜效果,另一方面,多孔淀粉内的微孔空隙小于水滴的直径而大于水蒸气分子的直径,能够阻止水滴通过,而让水蒸气分子自由通过,起到防水、透气的作用。因此,本发明不仅具有优良的保鲜效果,而且防水、透气。
2、本发明一种果蔬保鲜瓦楞纸箱的纸板外表面覆有聚合物微孔纤维膜,且聚合物微孔纤维膜的原料组成及其重量份比包括:β晶型聚丙烯颗粒80–100、孔径为2.8–3.0A的碳分子筛粉32–40,一方面,该聚合物微孔纤维膜中同样含有碳分子筛,且纤维膜的纤维空隙直径也小于水滴的直径而大于水蒸气分子的直径,能够起到保鲜、防水、透气的作用,另一方面,该纤维膜具有一定的强度和耐磨性,将其覆在纸板的外侧不会因纸箱在搬运、装箱的过程中的摩擦、压缩、碰撞等而受损。因此,本发明不仅进一步提高了纸箱的保鲜、防水、透气性能,而且强度和耐磨性好。
具体实施方式
下面结合具体实施方式对本发明作进一步说明。
一种果蔬保鲜瓦楞纸箱,其纸板内表面涂覆有多孔淀粉保鲜涂料层,所述多孔淀粉保鲜涂料层的原料组成及其重量份比包括:多孔淀粉40–50、蒸馏水350–450、孔径为2.8–3.0A的碳分子筛粉50–60。
所述多孔淀粉保鲜涂料层的原料组成还包括苯丙乳液、硫酸钙晶须、硼砂、增稠剂,所述苯丙乳液、硫酸钙晶须、硼砂、增稠剂与多孔淀粉的重量份比为80–100:2–4:1–2:1–2:40–50。
所述瓦楞纸箱的纸板外表面覆有聚合物微孔纤维膜,所述聚合物微孔纤维膜的原料组成及其重量份比包括:β晶型聚丙烯颗粒80–100、孔径为2.8–3.0A的碳分子筛粉32–40。
所述聚合物微孔纤维膜的原料组成还包括硫酸钙晶须、10号白油,所述硫酸钙晶须、10号白油与β晶型聚丙烯颗粒的重量份比为1–2:0.05–0.08:80–100。
所述多孔淀粉保鲜涂料层的厚度为2–3mm,所述聚合物微孔纤维膜的厚度为0.1–0.2mm。
所述瓦楞纸箱上开设有由多个孔径为0.5–0.8mm的气孔组成的透气孔组,所述透气孔组的长度小于纸箱高度的1/4,透气孔组的宽度与其长度的比值为1/4–1/3。
上述果蔬保鲜瓦楞纸箱的制备方法,所述制备方法包括多孔淀粉保鲜涂料的制备方法,具体为:先将多孔淀粉、蒸馏水、碳分子筛粉按所需比例在80–90℃下混合均匀,然后充分研磨即得到多孔淀粉保鲜涂料。
所述瓦楞纸箱的纸板外表面覆有聚合物微孔纤维膜,所述聚合物微孔纤维膜的原料组成及其重量份比包括:β晶型聚丙烯颗粒80–100、孔径为2.8–3.0A的碳分子筛粉32–40;
所述制备方法还包括聚合物微孔纤维膜的制备方法,具体为:先将β晶型聚丙烯颗粒与碳分子筛粉常温混合,再排入到单螺杆挤出机中挤成片材,然后对片材依次在110–120℃单向热拉伸、110–140℃热定型,即得到聚合物微孔纤维膜。
所述β晶型聚丙烯颗粒采用以下方法制备得到:
先将聚丙烯T30S树脂加入高速混合机,边搅拌边加入10号白油,再加入β晶型成核剂、抗氧剂1010、抗氧剂168混合均匀后排入平行双螺杆挤出机中熔融挤出,然后依次进行水下模面切粒、粒子脱水、烘干操作即可,其中,所述聚丙烯T30S树脂、β晶型成核剂、抗氧剂1010、抗氧剂168、10号白油的重量比为80–100:1–2:0.2–0.3:0.2–0.3:0.05–0.08。
所述单螺杆挤出机的挤出工艺温度为:一区185±5℃、二区215±5℃、三区215±5℃、四区225±5℃、五区215±5℃、机头200±5℃;
所述单向热拉伸的应变速率为5m/min,拉伸范围为7-9倍;
所述热定型的时间为5–8min;
所述平行双螺杆挤出机的工作温度为:一区175±5℃,二区215±5℃,三区225±5℃,四区225±5℃,五区215±5℃,机头205±5℃。
本发明的原理说明如下:
本发明提供了一种果蔬保鲜瓦楞纸箱,其通过在纸板内、外表面分别涂覆多孔淀粉保鲜涂料层和聚合物微孔纤维膜来增加纸箱内的氮气含量,从而抑制了果蔬的呼吸作用,达到保鲜的目的。其具体原理如下:
多孔淀粉保鲜涂料层:由于碳分子筛的孔径为2.8-3.0A,氧气的动力学直径在2.8-3.0A,而氮气的动力学直径在3.0-3.8A,因此氧气能自由进入碳分子筛的微孔内即被碳分子筛吸附,而氮气则不能进入碳分子筛的微孔内,只能通过多孔淀粉保鲜涂料层。随着氧气不断被层中的碳分子筛吸附,纸箱内部的压力降低,在内外压差的作用下,纸箱外部的氮气不断进入纸箱内部,使得纸箱内部的氧气含量越来越低,氮气含量越来越高,最终氮气的含量可升到98%以上,该气氛能完全抑制果蔬的呼吸作用,使果蔬处于保鲜状态。另外,多孔淀粉内部富含微孔和空隙,其微孔直径在0.5-1.5μm,空隙为7-8μm,该尺寸使得水蒸气和气体可以自由通过,水滴却无法通过,从而起到防水、透气的作用。
聚合物微孔纤维膜:本发明中,β晶型聚丙烯在拉伸过程中由于相态间密度的差异导致其由低密度向高密度转变,从而发生β晶型向α晶型转变形成微孔,然后经热定型制备成微孔纤维膜,使得微孔膜的孔径为50-100nm,纤维空隙为0.2-10μm,孔隙率达80%以上,空隙直径是水滴直径的1/5000-1/20000,是水蒸汽分子直径的700倍左右,具有良好的防水、透气作用。
透气孔组:本发明通过在纸箱上开设透气孔组,使空气中的氮气能够快速进入纸箱内部以平衡内外气压;同时,纸箱内的水蒸气与其它气体也可以通过该透气孔组排到纸箱外部。为保证纸箱的耐压性能,透气孔组中的气孔需以纸板的垂直中心轴为中心左右对称分布,且在开设透气孔组后,纸箱的耐压残余量应大于80%。
多孔淀粉:本发明中,多孔淀粉为碳分子筛的载体,碳分子筛均匀分散在多孔淀粉中。
苯丙乳液:本发明中,苯丙乳液与多孔淀粉配合使用,作为成膜乳液,使涂料的涂膜效果更好、更均匀、附着力更强。
本发明中各原料说明如下:
多孔淀粉:玉米多孔淀粉,白色粉末状,多孔性蜂窝状,市售。
苯丙乳液:苯乙烯-丙烯酸酯乳液,乳白色液体,固含量47±1%,市售。
硫酸钙晶须:白色疏松针状物,增强剂,填充剂,市售。
硼砂:粘度调节,白色结晶粉末,市售。
增稠剂:羧甲基纤维素钠,白色至淡黄色粉末,市售。
碳分子筛粉:黑色固体粉末,孔径:2.8-3.0A,进口。
聚丙烯T30S:等规聚丙烯,聚丙烯树脂颗粒,熔融指数2.0/10min。
10号白油:无色油状液体,润湿剂。
β晶型成核剂:白色粉末,促进拉伸形成微孔,市售。
实施例1:
一种果蔬保鲜瓦楞纸箱,其纸板内表面涂覆有厚度为2mm的多孔淀粉保鲜涂料层,所述多孔淀粉保鲜涂料层的原料组成及其重量份比为:多孔淀粉40、蒸馏水350、苯丙乳液80、孔径为2.8–3.0A的碳分子筛粉50、硫酸钙晶须2、硼砂1、增稠剂羧甲基纤维素钠1,所述瓦楞纸箱的纸板上开设有由多个孔径为0.6mm的气孔组成的透气孔组,所述透气孔组的长度为纸箱高度的1/5,透气孔组的宽度与其长度的比值为1/3。
上述果蔬保鲜瓦楞纸箱按照以下步骤制备得到:
多孔淀粉保鲜涂料的制备、先将多孔淀粉、蒸馏水、苯丙乳液、碳分子筛、硫酸钙晶须、硼砂、增稠剂粉按所需比例在85℃下混合均匀,然后充分研磨即得到多孔淀粉保鲜涂料;
瓦楞纸板打孔、在瓦楞纸板上开设透气孔组;
涂覆、利用全自动瓦楞纸板涂覆机将多孔淀粉保鲜涂料涂覆在瓦楞纸板的内表面;
纸箱成型、将涂覆有多孔淀粉保鲜涂料的瓦楞纸板进行粘箱、模切、钉箱等操作以得到瓦楞纸箱。
实施例2:
与实施例1的不同之处在于:
所述瓦楞纸箱的纸板外表面覆有厚度为0.1mm的聚合物微孔纤维膜,所述聚合物微孔纤维膜的原料组成及其重量份比为:β晶型聚丙烯颗粒80、碳分子筛粉32、硫酸钙晶须1、10号白油0.05。
所述瓦楞纸箱的制备方法还包括聚合物微孔纤维膜的制备、覆膜,所述覆膜步骤位于涂覆步骤之后、纸箱成型步骤之前;
所述聚合物微孔纤维膜的制备为:先将β晶型聚丙烯颗粒、碳分子筛粉、硫酸钙晶须、10号白油按所需比例常温混合5min,再排入到单螺杆挤出机中挤成片材,然后对片材依次在115℃单向热拉伸、130℃热定型,即得到聚合物微孔纤维膜,其中,所述β晶型聚丙烯颗粒的制备方法为:先将聚丙烯T30S树脂加入高速混合机,边搅拌边加入10号白油,再加入β晶型成核剂、抗氧剂1010、抗氧剂168混合均匀后排入平行双螺杆挤出机中熔融挤出,然后依次进行水下模面切粒、粒子脱水、烘干操作即可,所述聚丙烯T30S树脂、β晶型成核剂、抗氧剂1010、抗氧剂168、10号白油的重量比为80:1:0.2:0.2:0.05,所述单螺杆挤出机的挤出工艺温度为:一区185±5℃、二区215±5℃、三区215±5℃、四区225±5℃、五区215±5℃、机头200±5℃,所述单向热拉伸的应变速率为5m/min,拉伸范围为5倍,所述热定型的时间为8min,所述平行双螺杆挤出机的工作温度为:一区175±5℃,二区215±5℃,三区225±5℃,四区225±5℃,五区215±5℃,机头205±5℃。
实施例3:
与实施例2的不同之处在于:
所述多孔淀粉保鲜涂料层的厚度为3mm,其原料组成及重量份比为:多孔淀粉50、蒸馏水450、苯丙乳液100、孔径为2.8–3.0A的碳分子筛粉60、硫酸钙晶须4、硼砂2、增稠剂羧甲基纤维素钠2;
所述聚合物微孔纤维膜的厚度为0.15mm,其原料组成及其重量份比为:β晶型聚丙烯颗粒100、碳分子筛粉40、硫酸钙晶须2、10号白油0.08。
所述聚合物微孔纤维膜的制备步骤中,聚丙烯T30S树脂、β晶型成核剂、抗氧剂1010、抗氧剂168、10号白油的重量比为100:2:0.3:0.3:0.08。
实施例4:
与实施例2的不同之处在于:
所述多孔淀粉保鲜涂料层的厚度为2.5mm,其原料组成及重量份比为:多孔淀粉45、蒸馏水400、苯丙乳液90、孔径为2.8–3.0A的碳分子筛粉55、硫酸钙晶须3、硼砂1.5、增稠剂羧甲基纤维素钠1.5;
所述聚合物微孔纤维膜的厚度为0.18mm,其原料组成及重量份比为:β晶型聚丙烯颗粒90、碳分子筛粉36、硫酸钙晶须1.5、10号白油0.07。
所述聚合物微孔纤维膜的制备步骤中,聚丙烯T30S树脂、β晶型成核剂、抗氧剂1010、抗氧剂168、10号白油的重量比为90:1.5:0.25:0.25:0.07,单向热拉伸温度为120℃,热定型温度为125℃。
本发明所述瓦楞纸箱的主要性能测试结果如下(纸箱尺寸500×400×300mm,双瓦楞):
耐破强度≥1400Kpa,戳穿强度≥30J,边压强度≥5000N/m,空箱承压强度≥5000N。
为考察本发明产品的保鲜效果,将实施例1、实施例2-4所述纸箱装箱(苹果)后分别进行保鲜效果测试,结果参见表1:
表1本发明实施例1-4测试结果
Claims (7)
1.一种果蔬保鲜瓦楞纸箱,其特征在于:
所述瓦楞纸箱的纸板内表面涂覆有厚度为2–3mm的多孔淀粉保鲜涂料层,瓦楞纸箱的纸板外表面覆有厚度为0.1–0.2mm的聚合物微孔纤维膜,所述多孔淀粉保鲜涂料层的原料组成及其重量份比包括:多孔淀粉40–50、蒸馏水350–450、孔径为2.8–3.0Å的碳分子筛粉50–60,所述聚合物微孔纤维膜的原料组成及其重量份比包括:β晶型聚丙烯颗粒80–100、孔径为2.8–3.0Å的碳分子筛粉32–40;
所述瓦楞纸箱上开设有由多个孔径为0.5–0.8mm的气孔组成的透气孔组,所述透气孔组的长度小于纸箱高度的1/4,透气孔组的宽度与其长度的比值为1/4–1/3。
2.根据权利要求1所述的一种果蔬保鲜瓦楞纸箱,其特征在于:所述多孔淀粉保鲜涂料层的原料组成还包括苯丙乳液、硫酸钙晶须、硼砂、增稠剂,所述苯丙乳液、硫酸钙晶须、硼砂、增稠剂与多孔淀粉的重量份比为80–100:2–4:1–2:1–2:40–50。
3.根据权利要求1所述的一种果蔬保鲜瓦楞纸箱,其特征在于:所述聚合物微孔纤维膜的原料组成还包括硫酸钙晶须、10号白油,所述硫酸钙晶须、10号白油与β晶型聚丙烯颗粒的重量份比为1–2:0.05–0.08:80–100。
4.一种权利要求1所述的果蔬保鲜瓦楞纸箱的制备方法,其特征在于:
所述制备方法包括多孔淀粉保鲜涂料的制备方法,具体为:先将多孔淀粉、蒸馏水、碳分子筛粉按所需比例在80–90℃下混合均匀,然后充分研磨即得到多孔淀粉保鲜涂料。
5.根据权利要求4所述的一种果蔬保鲜瓦楞纸箱的制备方法,其特征在于:
所述制备方法还包括聚合物微孔纤维膜的制备方法,具体为:先将β晶型聚丙烯颗粒与碳分子筛粉常温混合,再排入到单螺杆挤出机中挤成片材,然后对片材依次在110–120℃单向热拉伸、110–140℃热定型,即得到聚合物微孔纤维膜。
6.根据权利要求5所述的一种果蔬保鲜瓦楞纸箱的制备方法,其特征在于:
所述β晶型聚丙烯颗粒采用以下方法制备得到:
先将聚丙烯T30S树脂加入高速混合机,边搅拌边加入10号白油,再加入β晶型成核剂、抗氧剂1010、抗氧剂168混合均匀后排入平行双螺杆挤出机中熔融挤出,然后依次进行水下模面切粒、粒子脱水、烘干操作即可,其中,所述聚丙烯T30S树脂、β晶型成核剂、抗氧剂1010、抗氧剂168、10号白油的重量比为80–100:1–2:0.2–0.3:0.2–0.3:0.05–0.08。
7.根据权利要求6所述的一种果蔬保鲜瓦楞纸箱的制备方法,其特征在于:
所述单螺杆挤出机的挤出工艺温度为:一区185±5℃、二区215±5℃、三区215±5℃、四区225±5℃、五区215±5℃、机头200±5℃;
所述单向热拉伸的应变速率为5m/min,拉伸范围为7-9倍;
所述热定型的时间为5–8min;
所述平行双螺杆挤出机的工作温度为:一区175±5℃,二区215±5℃,三区225±5℃,四区225±5℃,五区215±5℃,机头205±5℃。
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