CN107283799B - 一种利用吹膜机制备的复合白卡纸 - Google Patents

一种利用吹膜机制备的复合白卡纸 Download PDF

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CN107283799B
CN107283799B CN201710575523.2A CN201710575523A CN107283799B CN 107283799 B CN107283799 B CN 107283799B CN 201710575523 A CN201710575523 A CN 201710575523A CN 107283799 B CN107283799 B CN 107283799B
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manufacturing machine
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inflation film
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CN107283799A (zh
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黄如辛
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Jilin Sheng Kang Medical Packaging Co., Ltd.
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Abstract

本发明提出一种利用吹膜机制备复合白卡纸，属于包装纸领域。通过吹膜机使吹胀的纸膜在平行铝质夹板下始终处于压扁状态，并在平行夹板末端设置10‑15度的夹角人字夹板，克服了在吹制厚度大于0.5mm白卡纸时因纸张挺度升高而无法压扁的缺陷，扁平膜泡在横向的受力拉伸由气压产生，其受力均匀，优于双向拉伸设备的机械拉伸，获得的卡纸厚薄均匀。简化了目前合成卡纸通过压延、双向拉伸制备的流程，提升了合成卡纸双向伸的均匀性和卡纸挺度。进一步利用平行夹板的支撑性克服了厚卡纸易摆动、厚薄不均的缺陷，使纸膜在80‑100℃的恒温状态下吹胀拉伸，获得厚度在0.5‑0.8mm的高挺度复合白卡纸。

Description

一种利用吹膜机制备的复合白卡纸
本申请涉及的是申请日为2015年12月23日申请号为2015109726278发明专利申请的分案申请。
技术领域
本发明涉及包装纸领域，具体涉及一种利用吹膜机制备的复合白卡纸。
背景技术
近年来，信息技术和包装印刷业飞速发展，造纸业不断向包装领域渗透。随着纸张在包装等领域的大量应用，需求越来越大。特别是白卡纸在包装领域的应用包括药品、保健品、化妆品、电子产品、手提袋、服装盒、玩具盒、香烟包装、纸杯、方便面盒、汉堡盒、糕点盒等食品包装大量的应用白卡纸，导致白卡纸需求急剧增长。但由于白卡纸需要60％的木浆，因此生产白卡纸需要消耗大量的森林资源，产生大量的废水。为了摆脱造纸对植物纤维造纸的依赖，消除造纸的废水排放，提升纸张在包装领域的功能性，一种由高分子聚合物与碳酸钙等无机粉体材料组成，通过热塑混炼、吹塑或压延得到的合成纸较好的解决了纸张对植物纤维纸浆的依赖，而且制作过程无需植物纤维，不砍伐树木，不排放废水，不需添加漂白剂、强酸、强碱，不会对环境造成污染。
中国发明专利CN102219950A公开了一种高填充聚乙烯合成纸的制备方法，将高密度聚乙烯、重质碳酸钙、无水氯化钙、十二烷基苯磺酸钠、抗氧剂1076加入到密炼机中，经密炼至温度达到150-180℃；然后将密炼后的材料送入挤出机中，挤出机出来的熔体经T型模头送入到压延机中，熔体在140-160℃的温度下压延成片材，然后将片材送入多辊拉伸机中拉伸，得到需要的合成纸。
中国发明专利CN1229719公开了一种制造环保纸的方法，将包括天然无机矿粉、聚乙烯和助剂的组合物经混合挤压混炼聚合制成颗粒状材料；将颗粒状材料投入纸膜制造机，形成膜管；向膜管内充压缩空气，同时进行膜管拉伸，制成具有双向组织强度的环保纸。吹塑法可进行双向的拉伸，但只能得到较薄的合成纸，不能获得厚度在0.5mm以上的白卡纸。
中国发明专利CN1378909A和CN1480485A分别报道了由聚乙烯(PE)和适当的无机矿粉或超细矿物粉组成的合成纸材料；CN1381347A报道了以聚乙烯(PE)或聚丙烯(PP)与无机矿粉形式的合成纸材料；CN1912241A报道了由PP、PE或聚氯乙烯(PVC)与超细碳酸钙共同组成的合成纸材料。这种通过双向拉伸法得到的合成纸对物料的热流动性要求高，其体系主要以树脂为主要原料，其加工性、成型特性较好，但由于成本较高，造成在一次性包装领域的应用受到限制。
近些年来，随着无机粉体技术的发展，合成纸逐渐演变为以无机粉体为主，高分子树脂为辅的石头纸。这种以石粉为主要原料的石头纸采用双向拉伸设备进行双向拉伸不但困难，而且由于粉体含量高使均匀度受限，无法通过双向拉伸得到厚度在0.5mm以上的白卡纸。而采用压延则只能得到单向拉伸的卡纸，使石头卡纸的挺度、强度降低。
发明内容
吹塑法通过纵向牵引和横向吹胀实现了石头纸的双向拉伸，但只能制备厚度在0.3mm以内的纸张，无法获得厚度大于0.5的卡纸，针对这一缺陷，本发明提出一种利用吹膜机制备复合白卡纸的方法。
一种利用吹膜机制备复合白卡纸的方法，其特征是：通过下吹、平吹或者上吹的吹塑法，利用平行夹板使吹胀的纸膜始终处于压扁状态，夹板内设置循环冷却水，使纸膜在60-80℃的恒温状态下吹胀拉伸，获得厚度在0.5-0.8mm的高挺度复合白卡纸。
一种利用吹膜机制备复合白卡纸的方法，其特征是利用吹膜机设置的平行夹板制备白卡纸,具体制备方法如下：
(1)将重量份为50-60份的碳酸钙、重量份为10-15份的空心微珠、重量份为5-10份的高岭土、10-15重量份的高分子聚合物、1-3重量份的聚乙烯蜡、0-2重量份的增白剂在80-120℃条件下以400-800rpm的转速搅拌混合20-25min，然后送入双螺杆挤出机进行造粒，具体各区温度范围如下：Ⅰ区温度180～190℃、Ⅱ区190～200℃、Ⅲ区温度220～230℃、Ⅳ区温度200～210℃、Ⅴ区温度200～180℃；
(2)将步骤(1)得到的粒料送入吹膜机，吹膜机温度设置由进料口到口模依次为190-200℃、210-220℃、200-190℃，熔融的粒子经机头过滤去杂质后从模头模口出来，经风环冷却控制50-80cm长的圆筒状细颈，圆筒状细颈直径与模口直径一致,在吹胀膜泡处设置平行夹板，逐渐将夹板间距缩短至与细颈的直径一致，使吹胀的纸膜始终处于压扁状态被横向拉伸,所述的平行夹板为铝质夹板，内设置循环恒温水，使纸膜在80-100℃的恒温状态下吹胀拉伸；
(3)平行夹板末端设置人字夹板，人字夹板的夹角设置为10-15度，经过人字夹板将处于扁平的膜泡压实、压平，经牵引辊牵引、切边、卷取得到厚度在0.5-0.8mm的高挺度复合白卡纸。
上述制备方法，步骤(1)所述的碳酸钙为粒径在800-1250目的重质碳酸钙。
上述制备方法，步骤(1)所述的空心微珠是二氧化硅和三氧化二铝经过高温烧制而成的闭孔微珠，直径在10-30微米之间，用于改善加工流动性和降低密度。
上述制备方法，步骤(1)所述的高分子聚合物为吹塑级的高密度聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯中的至少一种。
上述制备方法，步骤(1)所述的聚乙烯蜡为分子量4500-5000的中分子量耐高温聚乙烯蜡。
上述制备方法，步骤(1)所述的增白剂为沉淀硫酸钡。
上述制备方法，步骤(2)所述的吹膜机为单螺杆吹膜机，螺杆长径比L/D在20-25之间，进料端螺纹槽深与螺杆直径比为1:4-1:5。
上述制备方法，步骤(2)所述的吹膜机为平吹法、下吹法或者上吹法。
上述制备方法，步骤(2)所述的逐渐将夹板间距缩短至与细颈的直径一致，使吹胀的纸膜始终处于压扁状态被横向拉伸，其中纸膜横向拉伸距离与夹板间距的比为5-6:1。
一种利用吹膜机制备复合白卡纸的方法，通过吹膜机使吹胀的纸膜在平行铝质夹板下始终处于压扁状态，并在平行夹板末端设置10-15度的夹角人字夹板，克服了在吹制厚度大于0.5mm白卡纸时因纸张挺度升高而无法压扁的缺陷，进一步利用平行夹板的支撑性克服了厚卡纸易摆动、厚薄不均的缺陷，使纸膜在80-100℃的恒温状态下吹胀拉伸，获得厚度在0.5-0.8mm的高挺度复合白卡纸。
通过吹膜法吹制厚卡纸时，在纸膜由圆筒状逐渐压平过程中，由于卡纸较厚，圆筒纸膜内外壁存在较大的应力差，加之卡纸挺度，因此难以由筒状压成平整状卡纸。采用本发明复合卡纸的制备方法，通过平行夹板，使纸膜吹胀时始终处于被压扁的状态，因此内外壁受力均匀，在横向方向由气压拉伸，可获得厚度大、幅宽大、拉伸均匀的卡纸。
一种利用吹膜机制备复合白卡纸的方法，与现有技术相比突出的特点和有益的效果在于：
1、利用设置平行铝质夹板，实现了吹塑法制备厚度在0.5-0.8mm的高挺度复合白卡纸，克服了目前利用双向拉伸机对高含量无机粉体合成纸难以拉伸、无法得到厚卡纸的缺陷。
2、通过在平行铝质夹板内设置循环恒温水，使纸膜在80-100℃的恒温状态下吹胀拉伸，保证了膜泡在扁平状态下恒温拉伸，扁平膜泡在横向的受力拉伸由气压产生，其受力均匀，优于双向拉伸设备的机械拉伸，获得的卡纸厚薄均匀。
3、利用平行夹板使吹胀的纸膜始终处于压扁状态，实现了高挺度卡纸内外表面应力均匀，在小角度夹角下可直接压实。
4、一种利用吹膜机制备复合白卡纸的方法，简化了目前合成卡纸通过压延、双向拉伸制备的流程，提升了合成卡纸双向伸的均匀性和卡纸挺度。
附图说明
附图1通过上吹法制备复合白卡纸时，平行夹板设置的正面示意图，1-吹塑模头；2-长颈；3-平行夹板；4-膜泡；5-人字板。
附图2通过上吹法制备复合白卡纸时，平行夹板设置的侧面示意图，1-吹塑模头；2-长颈；3-平行夹板；4-膜泡；5-人字板。
具体实施方式
以下通过具体实施方式对本发明作进一步的详细说明，但不应将此理解为本发明的范围仅限于以下的实例。在不脱离本发明上述方法思想的情况下,根据本领域普通技术知识和惯用手段做出的各种替换或变更,均应包含在本发明的范围内。
实施例1
(1)将重量份为50份的碳酸钙、重量份为10份的空心微珠、重量份为10份的高岭土、15重量份的聚苯乙烯、3重量份的分子量4500-5000的中分子量耐高温聚乙烯蜡、在80-120℃条件下以800rpm的转速搅拌混合25min，然后送入双螺杆挤出机进行造粒，具体各区温度范围如下：Ⅰ区温度180～190℃、Ⅱ区190～200℃、Ⅲ区温度220～230℃、Ⅳ区温度200～210℃、Ⅴ区温度200～180℃；
(2)将步骤(1)得到的粒料送入上吹法吹膜机，吹膜机温度设置由进料口到口模依次为190-200℃、210-220℃、200-190℃，熔融的粒子经机头过滤去杂质后从模头模口出来，模口直径为20cm，经风环冷却控制60cm长的圆筒状细颈，圆筒状细颈直径与模口直径一致,在吹胀膜泡处设置平行夹板，逐渐将夹板间距缩短至20cm，使吹胀的纸膜始终处于压扁状态被横向拉伸，所述的平行夹板为铝质夹板，内设置循环恒温水，使纸膜在80-100℃的恒温状态下吹胀拉伸，纸膜横向拉伸距离为100cm；
(3)平行夹板末端设置人字夹板，人字夹板的夹角设置为10-15度，经过人字夹板将处于扁平的膜泡压实、压平，经牵引辊牵引、切边、卷取得到厚度在0.6mm宽度为100cm的高挺度复合白卡纸。
实施例2
(1)将重量份为55份的碳酸钙、重量份为10份的空心微珠、重量份为8份的高岭土、10重量份的高密度聚乙烯、2重量份的聚乙烯蜡、1重量份的沉淀硫酸钡在80-120℃条件下以400rpm的转速搅拌混合20min，然后送入双螺杆挤出机进行造粒，具体各区温度范围如下：Ⅰ区温度180～190℃、Ⅱ区190～200℃、Ⅲ区温度220～230℃、Ⅳ区温度200～210℃、Ⅴ区温度200～180℃；
(2)将步骤(1)得到的粒料送入平吹法吹膜机，吹膜机温度设置由进料口到口模依次为190-200℃、210-220℃、200-190℃，熔融的粒子经机头过滤去杂质后从模头模口出来，口模直径25cm，经风环冷却控制80cm长的圆筒状细颈，圆筒状细颈直径与模口直径一致,在吹胀膜泡处设置平行夹板，逐渐将夹板间距缩短至25cm，使吹胀的纸膜始终处于压扁状态被横向拉伸，所述的平行夹板为铝质夹板，内设置循环恒温水，使纸膜在80-100℃的恒温状态下吹胀拉伸，纸膜横向拉伸距离为125cm；
(3)平行夹板末端设置人字夹板，人字夹板的夹角设置为10-15度，经过人字夹板将处于扁平的膜泡压实、压平，经牵引辊牵引、切边、卷取得到厚度在0.7mm，宽度125cm的高挺度复合白卡纸。
实施例3
(1)将重量份为60份的碳酸钙、重量份为15份的空心微珠、重量份为10份的高岭土、15重量份的聚氯乙烯、1重量份的聚乙烯蜡、2重量份的沉淀硫酸钡在80-120℃条件下以600rpm的转速搅拌混合20min，然后送入双螺杆挤出机进行造粒，具体各区温度范围如下：Ⅰ区温度180～190℃、Ⅱ区190～200℃、Ⅲ区温度220～230℃、Ⅳ区温度200～210℃、Ⅴ区温度200～180℃；
(2)将步骤(1)得到的粒料送入下吹法吹膜机，吹膜机温度设置由进料口到口模依次为190-200℃、210-220℃、200-190℃，熔融的粒子经机头过滤去杂质后从模头模口出来，模口直径为15cm，经风环冷却控制50cm长的圆筒状细颈，圆筒状细颈直径与模口直径一致,在吹胀膜泡处设置平行夹板，逐渐将夹板间距缩短至15cm，使吹胀的纸膜始终处于压扁状态被横向拉伸，所述的平行夹板为铝质夹板，内设置循环恒温水，使纸膜在80-100℃的恒温状态下吹胀拉伸，纸膜横向拉伸距离为90cm；
(3)平行夹板末端设置人字夹板，人字夹板的夹角设置为10-15度，经过人字夹板将处于扁平的膜泡压实、压平，经牵引辊牵引、切边、卷取得到厚度在0.8mm、宽度为90cm的高挺度复合白卡纸。
实施例4
(1)将重量份为50份的碳酸钙、重量份为12份的空心微珠、重量份为5份的高岭土、15重量份的聚丙烯、3重量份的聚乙烯蜡在80-120℃条件下以400-800rpm的转速搅拌混合20min，然后送入双螺杆挤出机进行造粒，具体各区温度范围如下：Ⅰ区温度180～190℃、Ⅱ区190～200℃、Ⅲ区温度220～230℃、Ⅳ区温度200～210℃、Ⅴ区温度200～180℃；
(2)将步骤(1)得到的粒料送入平吹法吹膜机，吹膜机温度设置由进料口到口模依次为190-200℃、210-220℃、200-190℃，熔融的粒子经机头过滤去杂质后从模头模口出来，模口直径为20cm，经风环冷却控制55cm长的圆筒状细颈，圆筒状细颈直径与模口直径一致,在吹胀膜泡处设置平行夹板，逐渐将夹板间距缩短至20cm，使吹胀的纸膜始终处于压扁状态被横向拉伸，所述的平行夹板为铝质夹板，内设置循环恒温水，使纸膜在80-100℃的恒温状态下吹胀拉伸，横向拉伸距离为110cm；
(3)平行夹板末端设置人字夹板，人字夹板的夹角设置为10-15度，经过人字夹板将处于扁平的膜泡压实、压平，经牵引辊牵引、切边、卷取得到厚度在0.5mm、宽度为110cm的高挺度复合白卡纸。

Claims (8)

1.一种利用吹膜机制备的复合白卡纸，其特征在于，利用吹膜机设置的平行夹板制备复合白卡纸,具体制备方法如下：
(1)将重量份为50-60份的碳酸钙、重量份为10-15份的空心微珠、重量份为5-10份的高岭土、10-15重量份的高分子聚合物、1-3重量份的聚乙烯蜡、0-2重量份的增白剂在80-120℃条件下以400-800rpm的转速搅拌混合20-25min，然后送入双螺杆挤出机进行造粒，具体各区温度范围如下：Ⅰ区温度180～190℃、Ⅱ区190～200℃、Ⅲ区温度220～230℃、Ⅳ区温度200～210℃、Ⅴ区温度200～180℃；
(2)将步骤(1)得到的粒料送入吹膜机，吹膜机温度设置由进料口到口模依次为190-200℃、210-220℃、200-190℃，熔融的粒子经机头过滤去杂质后从模头模口出来，经风环冷却控制50-80cm长的圆筒状细颈，圆筒状细颈直径与模口直径一致,在吹胀膜泡处设置平行夹板，逐渐将夹板间距缩短至与细颈的直径一致，使吹胀的纸膜始终处于压扁状态被横向拉伸,所述的平行夹板为铝质夹板，内设置循环恒温水，使纸膜在80-100℃的恒温状态下吹胀拉伸；
(3)平行夹板末端设置人字夹板，人字夹板的夹角设置为10-15度，经过人字夹板将处于扁平的膜泡压实、压平，经牵引辊牵引、切边、卷取得到厚度在0.5-0.8mm的高挺度复合白卡纸。
2.根据权利要求1所述一种利用吹膜机制备的复合白卡纸，其特征在于：步骤(1)所述的碳酸钙为粒径在800-1250目的重质碳酸钙。
3.根据权利要求1所述一种利用吹膜机制备的复合白卡纸，其特征在于：步骤(1)所述的空心微珠是二氧化硅和三氧化二铝经过高温烧制而成的闭孔微珠，直径在10-30微米之间。
4.根据权利要求1所述一种利用吹膜机制备的复合白卡纸，其特征在于：步骤(1)所述的高分子聚合物为吹塑级的高密度聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯中的至少一种。
5.根据权利要求1所述一种利用吹膜机制备的复合白卡纸，其特征在于：步骤(1)所述的聚乙烯蜡为分子量4500-5000的中分子量耐高温聚乙烯蜡；所述的增白剂为沉淀硫酸钡。
6.根据权利要求1所述一种利用吹膜机制备的复合白卡纸，其特征在于：步骤(2)所述的吹膜机为单螺杆吹膜机，螺杆长径比L/D在20-25之间，进料端螺纹槽深与螺杆直径比为1:4-1:5。
7.根据权利要求1所述一种利用吹膜机制备的复合白卡纸，其特征在于：步骤(2)所述的吹膜机为平吹法、下吹法或者上吹法。
8.根据权利要求1所述一种利用吹膜机制备的复合白卡纸，其特征在于：步骤(2)所述的逐渐将夹板间距缩短至与细颈的直径一致，使吹胀的纸膜始终处于压扁状态被横向拉伸，其中纸膜横向拉伸距离与夹板间距的比为5-6:1。
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