CN110952379B - 一种包装礼盒用纸板 - Google Patents
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- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
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- D—TEXTILES; PAPER
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- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
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Abstract
本发明涉及一种包装礼盒用纸板,包括PP膜与灰底白板纸,所述灰底白板纸包括涂布层、纸蕊层以及灰底层,所述纸蕊层按质量分数包括以下组分:回收纤维浆35‑65%、改性淀粉25‑45%、记忆合金粉5‑15%、焦麻纤维粉5‑10%、干强剂2‑4%以及助留剂0.1‑0.3%;所述改性淀粉为质量分数比为1:(0.6‑1.2)的氧化淀粉与磷酸酯淀粉。本发明使得纸板在弯折时具有快速定型的效果。
Description
技术领域
本发明涉及纸板生产的技术领域,尤其是涉及一种包装礼盒用纸板。
背景技术
纸板的种类很多,其中包括灰底白纸板,灰底白板纸是一种比较高级的包装用纸,是具有2-3层结构的挂面纸板,主要用于礼盒的制备与包装。灰底白纸板的底面为粗糙的灰色,另一面是可用于印刷的白色。灰底白纸板经彩色印刷后可制成各种类的纸盒、纸箱,起着保护商品、装潢美化商品的促销作用,还可以用于制作吊牌、衬版和吸塑包装的底板。灰底白纸板具有薄厚一致、不起毛、不掉粉、有韧性、折叠时不易断裂的特点,因此被广泛使用。不同等级的灰底白纸板在颜色、光泽度、抗张强度、耐破度等内在质量上都有所不同。近年来,为了响应国家节能减排的号召,保护生态环境,实现可持续发展。在制造灰底白纸板时多采用废纸纸浆作为产品原料,不仅能显著降低企业成本,还可以减少废纸对环境的破坏。
由于纸板多用于礼盒包装,这对纸板的可塑性以及定型性产生了一定的要求,市面上的纸板在制备礼盒时往往在多次弯折后也无法定型,这不仅影响了礼盒制备的效率、增大了礼盒制备的难度,还影响了礼盒成品品质,由于纸板无法快速定型而必须多次弯折,纸板的弯折处还可能会产生多条折痕甚至被裂痕,导致礼盒的美观度与品质受到影响。
发明内容
针对现有技术存在的不足,本发明的目的是提供一种包装礼盒用纸板,其在弯折时具有快速定型的效果。
本发明的上述目的是通过以下技术方案得以实现的:一种包装礼盒用纸板,包括PP膜与灰底白板纸,所述灰底白板纸包括涂布层、纸芯层以及灰底层,所述纸芯层按质量分数包括以下组分:回收纤维浆35-65%、改性淀粉25-45%、记忆合金粉5-15%、干强剂2-4%以及助留剂0.1-0.3%。
通过采用上述技术方案,记忆合金粉通过热弹性与马氏体相变及其逆变而具有形状记忆效应,将记忆合金粉添加至纸芯层组分中并制备出纸板,在弯折纸板进行礼盒制备时,纸板具有快速定型的性能,从而避免反复多次弯折纸板而导致纸板产生折痕甚至裂痕的问题,提高了礼盒制备的效率以及礼盒的品质。
本发明在一较佳示例中可以进一步配置为:所述记忆合金粉为镍-钛记忆合金粉。
通过采用上述技术方案,镍金属质硬且具有良好的延展性,还具有高度磨光性和优越的抗腐蚀性能;钛金属具有重量轻、强度高、耐湿耐腐蚀的特性,且钛金属还具有较高的机械强度;
将两种金属制备成镍-钛记忆合金粉并添加至纸芯层组分中,不仅可弥补纸板不易定型的缺陷,还具有增强纸板强度、延展性、耐水性以及耐腐蚀的性能,从而提高礼盒的品质。
本发明在一较佳示例中可以进一步配置为:所述改性淀粉为质量分数比为1:(0.6-1.2)的氧化淀粉与磷酸酯淀粉。
通过采用上述技术方案,氧化淀粉颜色洁白、糊透明、热稳定性高、抗冻融性好,且氧化淀粉还具有良好的成膜性;磷酸酯淀粉极易糊化、透明度高、黏度高、良好冻融稳定性好,且具有优越的胶黏性;
将两种改性淀粉按照一定的配比添加至组分中,具有以下几点主要作用:①氧化淀粉用于提高纸板的热稳定性,并在纸板表面成膜,从而提高纸板的防水性能;②磷酸酯淀粉用于提高纸板的抗冻融性以及稳定性,由于磷酸酯淀粉具有良好的黏度,不仅具有为组分增稠的效果,还具有增强组分粘性,提高组分之间粘合度的效果;③氧化淀粉与磷酸酯淀粉制备简单,且价格低于回收纤维浆的价格,可作为填料使用,从而降低纸板的生产制造成本。
本发明在一较佳示例中可以进一步配置为:所述组分中还包括焦麻纤维粉5-10%。
通过采用上述技术方案,蕉麻纤维是最具有韧性的植物纤维之一,将蕉麻纤维磨成粉末制备出蕉麻纤维粉,并将蕉麻纤维粉添加至组分中,从而用于提高纸板的韧性与耐弯折强度,以此减少纸板弯折时产生的折痕数,并降低纸板产生裂痕的可能性。
本发明在一较佳示例中可以进一步配置为:所述干强剂为分子量为600-800万的聚丙烯酰胺。
本发明在一较佳示例中可以进一步配置为:所述助留剂为分子量为100-150万的聚乙烯亚胺。
本发明在一较佳示例中可以进一步配置为:所述PP膜与所述灰底白板纸之间通过表面施胶剂粘结,所述表面施胶剂为羧甲基纤维素。
通过采用上述技术方案,表面施胶剂的作用是在纸板表面涂覆一层胶制剂,从而提高纸板的耐水性或强度;由于表面施胶剂具有良好的粘性,将其作为胶黏剂用于PP膜与灰底白板纸之间的连接,从而避免再使用多余的胶黏剂将两者复合,一方面降低了生产成本,另一方面提高了纸板的环保性能;
羧甲基纤维素的主要作用有二:①其本身具有良好的粘性,用于复合PP膜与灰底白板纸;②用于增强纸板的强度。
本发明在一较佳示例中可以进一步配置为:所述纸板的制备方法包括以下步骤:
S1.纸芯层制备:将回收纤维浆、改性淀粉、记忆合金粉以及焦麻纤维粉先混合均匀,再添加干强剂与助留剂继续搅拌,整个混合过程搅拌温度为25-45℃,制得混合浆料;将混合浆料传送至纸机抄造成型,制得纸芯层;
S2.灰底白板纸制备:将纸芯层与灰底层进行压榨脱水复合形成纸板预成品,并对纸板预成品进行干燥处理;再在纸芯层远离灰底层的一面涂覆白色涂料形成涂布层,制得灰底白板纸;
S3.PP膜复合:在灰底白板纸未完全干燥却具有一定强度时喷涂表面施胶剂,并将PP膜压覆于表面施胶剂上,对PP膜与灰底白板纸进行挤压烘干处理,制得纸板成品。
通过采用上述技术方案,先称量配方组分制备出纸芯层后,再将纸芯层与灰底层进行压榨复合,再在纸芯层上涂覆形成涂布层;表面施胶剂的作用不仅用于增强纸板的强度,还具有将PP层与灰底白板纸粘压复合的作用。
综上所述,本发明包括以下至少一种有益技术效果:
1.记忆合金粉使得纸板具有快速定型的性能,从而避免反复多次弯折纸板而导致纸板产生折痕甚至裂痕的问题,提高了礼盒制备的效率以及礼盒的品质;
2.镍-钛记忆合金粉不仅可弥补纸板不易定型的缺陷,还具有增强纸板强度、延展性、耐水性以及耐腐蚀的性能,从而提高礼盒的品质;
3.改性淀粉的添加不仅具有提高纸板各项理化性能的效果,还可作为填料使用,从而降低纸板的生产制造成本;
4.蕉麻纤维粉用于提高纸板的韧性与耐弯折强度,以此减少纸板弯折时产生的折痕数,并降低纸板产生裂痕的可能性。
具体实施方式
实施例1,为本发明公开的一种包装礼盒用纸板,包括PP膜与灰底白板纸,灰底白板纸包括涂布层、纸芯层以及灰底层,纸芯层按质量分数包括以下组分:
组分 | 质量分数/% | 组分 | 质量分数/% |
回收纤维浆 | 45 | 焦麻纤维粉 | 7.5 |
氧化淀粉 | 21.875 | 聚丙烯酰胺 | 2.8 |
磷酸酯淀粉 | 13.125 | 聚乙烯亚胺 | 0.2 |
镍-钛记忆合金粉 | 9.5 |
聚丙烯酰胺的分子量为750万;聚乙烯亚胺的分子量为125万;
纸板的制备方法包括以下步骤:
S1.纸芯层制备:将回收纤维浆、氧化淀粉、磷酸酯淀粉、镍-钛记忆合金粉以及焦麻纤维粉先混合均匀,再添加聚丙烯酰胺与聚乙烯亚胺继续搅拌,整个混合过程搅拌温度为35℃,制得混合浆料;将混合浆料传送至纸机抄造成型,制得纸芯层;
S2.灰底白板纸制备:将纸芯层与灰底层进行压榨脱水复合形成纸板预成品,并对纸板预成品进行干燥处理;再在纸芯层远离灰底层的一面涂覆白色涂料形成涂布层,制得灰底白板纸;
S3.PP膜复合:在灰底白板纸未完全干燥却具有一定强度时喷涂羧甲基纤维素,并将PP膜压覆于羧甲基纤维素上,对PP膜与灰底白板纸进行挤压烘干处理,制得纸板成品。
实施例2,为本发明公开的一种包装礼盒用纸板,包括PP膜与灰底白板纸,灰底白板纸包括涂布层、纸芯层以及灰底层,纸芯层按质量分数包括以下组分:
组分 | 质量分数/% | 组分 | 质量分数/% |
回收纤维浆 | 35.7 | 焦麻纤维粉 | 10 |
氧化淀粉 | 21.875 | 聚丙烯酰胺 | 4 |
磷酸酯淀粉 | 13.125 | 聚乙烯亚胺 | 0.3 |
镍-钛记忆合金粉 | 15 |
聚丙烯酰胺的分子量为750万;聚乙烯亚胺的分子量为125万;
纸板的制备方法同实施例1。
实施例3,为本发明公开的一种包装礼盒用纸板,包括PP膜与灰底白板纸,灰底白板纸包括涂布层、纸芯层以及灰底层,纸芯层按质量分数包括以下组分:
组分 | 质量分数/% | 组分 | 质量分数/% |
回收纤维浆 | 52.9 | 焦麻纤维粉 | 5 |
氧化淀粉 | 21.875 | 聚丙烯酰胺 | 2 |
磷酸酯淀粉 | 13.125 | 聚乙烯亚胺 | 0.1 |
镍-钛记忆合金粉 | 5 |
聚丙烯酰胺的分子量为750万;聚乙烯亚胺的分子量为125万;
纸板的制备方法同实施例1。
实施例4,为本发明公开的一种包装礼盒用纸板,包括PP膜与灰底白板纸,灰底白板纸包括涂布层、纸芯层以及灰底层,纸芯层按质量分数包括以下组分:
组分 | 质量分数/% | 组分 | 质量分数/% |
回收纤维浆 | 55 | 焦麻纤维粉 | 7.5 |
氧化淀粉 | 13.158 | 聚丙烯酰胺 | 2.8 |
磷酸酯淀粉 | 11.842 | 聚乙烯亚胺 | 0.2 |
镍-钛记忆合金粉 | 9.5 |
聚丙烯酰胺的分子量为750万;聚乙烯亚胺的分子量为125万;
纸板的制备方法同实施例1。
实施例5,为本发明公开的一种包装礼盒用纸板,包括PP膜与灰底白板纸,灰底白板纸包括涂布层、纸芯层以及灰底层,纸芯层按质量分数包括以下组分:
组分 | 质量分数/% | 组分 | 质量分数/% |
回收纤维浆 | 35 | 焦麻纤维粉 | 7.5 |
氧化淀粉 | 20.455 | 聚丙烯酰胺 | 2.8 |
磷酸酯淀粉 | 24.545 | 聚乙烯亚胺 | 0.2 |
镍-钛记忆合金粉 | 9.5 |
聚丙烯酰胺的分子量为750万;聚乙烯亚胺的分子量为125万;
纸板的制备方法同实施例1。
对比例1,为本发明公开的一种包装礼盒用纸板,包括PP膜与灰底白板纸,灰底白板纸包括涂布层、纸芯层以及灰底层,纸芯层按质量分数包括以下组分:
组分 | 质量分数/% | 组分 | 质量分数/% |
回收纤维浆 | 54.5 | 焦麻纤维粉 | 7.5 |
氧化淀粉 | 21.875 | 聚丙烯酰胺 | 2.8 |
磷酸酯淀粉 | 13.125 | 聚乙烯亚胺 | 0.2 |
镍-钛记忆合金粉 | 0 |
聚丙烯酰胺的分子量为750万;聚乙烯亚胺的分子量为125万;
纸板的制备方法包括以下步骤:
S1.纸芯层制备:将回收纤维浆、氧化淀粉以及磷酸酯淀粉先混合均匀,再添加聚丙烯酰胺与聚乙烯亚胺继续搅拌,整个混合过程搅拌温度为35℃,制得混合浆料;将混合浆料传送至纸机抄造成型,制得纸芯层;
S2与S3制备方法同实施例1。
对比例2,为本发明公开的一种包装礼盒用纸板,包括PP膜与灰底白板纸,灰底白板纸包括涂布层、纸芯层以及灰底层,纸芯层按质量分数包括以下组分:
组分 | 质量分数/% | 组分 | 质量分数/% |
回收纤维浆 | 45 | 焦麻纤维粉 | 7.5 |
氧化淀粉 | 21.875 | 聚丙烯酰胺 | 2.8 |
磷酸酯淀粉 | 13.125 | 聚乙烯亚胺 | 0.2 |
镍-铝记忆合金粉 | 9.5 |
聚丙烯酰胺的分子量为750万;聚乙烯亚胺的分子量为125万;
纸板的制备方法包括以下步骤:
S1.纸芯层制备:将回收纤维浆、氧化淀粉、磷酸酯淀粉以及镍-铝记忆合金粉先混合均匀,再添加聚丙烯酰胺与聚乙烯亚胺继续搅拌,整个混合过程搅拌温度为35℃,制得混合浆料;将混合浆料传送至纸机抄造成型,制得纸芯层;
S2与S3制备方法同实施例1。
对比例3,为本发明公开的一种包装礼盒用纸板,包括PP膜与灰底白板纸,灰底白板纸包括涂布层、纸芯层以及灰底层,纸芯层按质量分数包括以下组分:
组分 | 质量分数/% | 组分 | 质量分数/% |
回收纤维浆 | 45 | 焦麻纤维粉 | 7.5 |
氧化淀粉 | 21.875 | 聚丙烯酰胺 | 2.8 |
磷酸酯淀粉 | 13.125 | 聚乙烯亚胺 | 0.2 |
铜-锌记忆合金粉 | 9.5 |
聚丙烯酰胺的分子量为750万;聚乙烯亚胺的分子量为125万;
纸板的制备方法包括以下步骤:
S1.纸芯层制备:将回收纤维浆、氧化淀粉、磷酸酯淀粉以及铜-锌记忆合金粉先混合均匀,再添加聚丙烯酰胺与聚乙烯亚胺继续搅拌,整个混合过程搅拌温度为35℃,制得混合浆料;将混合浆料传送至纸机抄造成型,制得纸芯层;
S2与S3制备方法同实施例1。
对比例4,为本发明公开的一种包装礼盒用纸板,包括PP膜与灰底白板纸,灰底白板纸包括涂布层、纸芯层以及灰底层,纸芯层按质量分数包括以下组分:
组分 | 质量分数/% | 组分 | 质量分数/% |
回收纤维浆 | 80 | 焦麻纤维粉 | 7.5 |
氧化淀粉 | 0 | 聚丙烯酰胺 | 2.8 |
磷酸酯淀粉 | 0 | 聚乙烯亚胺 | 0.2 |
镍-钛记忆合金粉 | 9.5 |
聚丙烯酰胺的分子量为750万;聚乙烯亚胺的分子量为125万;
纸板的制备方法包括以下步骤:
S1.纸芯层制备:将回收纤维浆以及镍-钛记忆合金粉先混合均匀,再添加聚丙烯酰胺与聚乙烯亚胺继续搅拌,整个混合过程搅拌温度为35℃,制得混合浆料;将混合浆料传送至纸机抄造成型,制得纸芯层;
S2与S3制备方法同实施例1。
对比例5,为本发明公开的一种包装礼盒用纸板,包括PP膜与灰底白板纸,灰底白板纸包括涂布层、纸芯层以及灰底层,纸芯层按质量分数包括以下组分:
组分 | 质量分数/% | 组分 | 质量分数/% |
回收纤维浆 | 45 | 焦麻纤维粉 | 7.5 |
氧化淀粉 | 0 | 聚丙烯酰胺 | 2.8 |
磷酸酯淀粉 | 35 | 聚乙烯亚胺 | 0.2 |
镍-钛记忆合金粉 | 9.5 |
聚丙烯酰胺的分子量为750万;聚乙烯亚胺的分子量为125万;
纸板的制备方法包括以下步骤:
S1.纸芯层制备:将回收纤维浆、磷酸酯淀粉以及镍-钛记忆合金粉先混合均匀,再添加聚丙烯酰胺与聚乙烯亚胺继续搅拌,整个混合过程搅拌温度为35℃,制得混合浆料;将混合浆料传送至纸机抄造成型,制得纸芯层;
S2与S3制备方法同实施例1。
对比例6,为本发明公开的一种包装礼盒用纸板,包括PP膜与灰底白板纸,灰底白板纸包括涂布层、纸芯层以及灰底层,纸芯层按质量分数包括以下组分:
组分 | 质量分数/% | 组分 | 质量分数/% |
回收纤维浆 | 45 | 焦麻纤维粉 | 7.5 |
氧化淀粉 | 35 | 聚丙烯酰胺 | 2.8 |
磷酸酯淀粉 | 0 | 聚乙烯亚胺 | 0.2 |
镍-钛记忆合金粉 | 9.5 |
聚丙烯酰胺的分子量为750万;聚乙烯亚胺的分子量为125万;
纸板的制备方法包括以下步骤:
S1.纸芯层制备:将回收纤维浆、氧化淀粉以及镍-钛记忆合金粉先混合均匀,再添加聚丙烯酰胺与聚乙烯亚胺继续搅拌,整个混合过程搅拌温度为35℃,制得混合浆料;将混合浆料传送至纸机抄造成型,制得纸芯层;
S2与S3制备方法同实施例1。
对比例7,为本发明公开的一种包装礼盒用纸板,包括PP膜与灰底白板纸,灰底白板纸包括涂布层、纸芯层以及灰底层,纸芯层按质量分数包括以下组分:
组分 | 质量分数/% | 组分 | 质量分数/% |
回收纤维浆 | 52.5 | 焦麻纤维粉 | 0 |
氧化淀粉 | 21.875 | 聚丙烯酰胺 | 2.8 |
磷酸酯淀粉 | 13.125 | 聚乙烯亚胺 | 0.2 |
镍-钛记忆合金粉 | 9.5 |
聚丙烯酰胺的分子量为750万;聚乙烯亚胺的分子量为125万;
纸板的制备方法包括以下步骤:
S1.纸芯层制备:将回收纤维浆、氧化淀粉、磷酸酯淀粉以及镍-钛记忆合金粉先混合均匀,再添加聚丙烯酰胺与聚乙烯亚胺继续搅拌,整个混合过程搅拌温度为35℃,制得混合浆料;将混合浆料传送至纸机抄造成型,制得纸芯层;
S2与S3制备方法同实施例1。
性能检测试验
对由实施例1-5以及对比例1-7制备出的纸板进行取样,并对样品进行以下性能测试。
定型性能检测:对样品进行弯折,记录样品完全定型时的弯折次数,并将检测结果记录在表1中。
弯折性能检测:将样品反复弯折10次,观察弯折处的折痕深浅以及折痕扩散程度,并统计折痕数量;对折痕程度进行分级,折痕很深、扩散程度大且数量较多的为1级;折痕较深、扩散程度较大且数量不多的为2级;折痕不深、扩散程度小且数量不多的为3级,将检测结果记录在表2中。
防水性能检测:采用可勃吸收仪检测样品表面吸水能力,按照GB/T 1540-2002《纸和纸板吸水性的测定(可勃法)》进行检测,检测结果记录在表2中。
表1-样品的定型性能检测数据
样品 | 弯折定型次数/次 |
实施例1 | 2 |
对比例1 | 8 |
对比例2 | 4 |
对比例3 | 3 |
根据表1中的样品检测数据可知:镍-钛记忆合金粉具有提高纸板定型性的作用,从而提高礼盒的成品品质与成品效率;
镍-铝记忆合金粉以及铜-锌记忆合金粉同样具有提高纸板定型性的作用,但是其效果并没有镍-钛记忆合金粉的效果好,因此,以上实施例与对比例中,采用镍-钛记忆合金粉的实施例1为最佳实施例。
表2-样品的弯折性能与防水性能检测数据
样品 | 折痕等级/级 | 30min吸水值/g/m<sup>2</sup> |
实施例1 | 3 | 0.78 |
实施例2 | 3 | 0.75 |
实施例3 | 3 | 0.76 |
实施例4 | 3 | 0.73 |
实施例5 | 3 | 0.71 |
对比例4 | 1 | 1.13 |
对比例5 | 2 | 0.93 |
对比例6 | 2 | 1.02 |
对比例7 | 2 | 0.83 |
根据表2中实施例1-5的样品检测数据可知:在合适的范围内改变组分之间的配比,纸板均具有良好的防水性能以及弯折性能;
改性淀粉具有提高纸板韧性,从而增强纸板弯折性能的作用;改性淀粉还具有提高纸板防水性能的作用;
单独添加氧化淀粉或磷酸酯淀粉对提升纸板弯折性能与防水性能的效果没有同时添加两者的提升性能明显,说明两者同时添加对组分不会产生影响,具有进一步提升纸板性能的作用;
蕉麻纤维粉对于提升纸板韧性,从而提升纸板弯折强度的作用明显,但对于提升纸板防水性能的作用不明显。
本具体实施方式的实施例均为本发明的较佳实施例,并非依此限制本发明的保护范围,故:凡依本发明的结构、形状、原理所做的等效变化,均应涵盖于本发明的保护范围之内。
Claims (2)
1.一种包装礼盒用纸板,包括PP膜与灰底白板纸,其特征在于:所述灰底白板纸包括涂布层、纸芯层以及灰底层,所述纸芯层按质量分数包括以下组分:回收纤维浆35-55%、改性淀粉25-45%、记忆合金粉5-15%、干强剂2-4%以及助留剂0.1-0.3%;所述记忆合金粉为镍-钛记忆合金粉;所述改性淀粉为质量分数比为1:1.2的氧化淀粉与磷酸酯淀粉;所述组分中还包括焦麻纤维粉5-10%;所述干强剂为分子量为600-800万的聚丙烯酰胺;所述助留剂为分子量为100-150万的聚乙烯亚胺;所述PP膜与所述灰底白板纸之间通过表面施胶剂粘结,所述表面施胶剂为羧甲基纤维素。
2.根据权利要求1所述的一种包装礼盒用纸板,其特征在于:所述纸板的制备方法包括以下步骤:
S1.纸芯层制备:将回收纤维浆、改性淀粉、记忆合金粉以及焦麻纤维粉先混合均匀,再添加干强剂与助留剂继续搅拌,整个混合过程搅拌温度为25-45℃,制得混合浆料;将混合浆料传送至纸机抄造成型,制得纸芯层;
S2.灰底白板纸制备:将纸芯层与灰底层进行压榨脱水复合形成纸板预成品,并对纸板预成品进行干燥处理;再在纸芯层远离灰底层的一面涂覆白色涂料形成涂布层,制得灰底白板纸;
S3.PP膜复合:在灰底白板纸未完全干燥却具有一定强度时喷涂表面施胶剂,并将PP膜压覆于表面施胶剂上,对PP膜与灰底白板纸进行挤压烘干处理,制得纸板成品。
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