CN116479679B - 低定量机内涂布热升华数码转印纸的生产工艺 - Google Patents

低定量机内涂布热升华数码转印纸的生产工艺 Download PDF

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CN116479679B
CN116479679B CN202310622549.3A CN202310622549A CN116479679B CN 116479679 B CN116479679 B CN 116479679B CN 202310622549 A CN202310622549 A CN 202310622549A CN 116479679 B CN116479679 B CN 116479679B
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宋佃凤
王帅
徐家东
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Shandong Renfeng Speical Materials Co ltd
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Abstract

本发明涉及造纸工业技术领域,具体涉及一种低定量机内涂布热升华数码转印纸的生产工艺。包括以下步骤:1#涂料的制备、2#涂料的制备、涂料过滤、磨浆、造纸、涂布、烘干;还将1#涂料进行了回收循环利用,本发明正面涂布1#涂料,满足转移印花需求,反面涂布淀粉,防止纸页翘曲。本发明将原来表面施胶使用的涂布正面V型计量棒换成U型计量棒,由于机内涂布数码纸涂料粘度高,容易糊计量棒而导致纸页横幅涂布量不均匀,下游客户转移印花时易出现整幅印花颜色不均匀而导致印花布匹报废的问题。机内涂布经膜转移涂布机上料后,后烘干部容易粘辊粘缸,造成涂层破坏,本发明设置干燥箱温度为340‑360℃,提高成纸干度,杜绝粘辊粘缸。

Description

低定量机内涂布热升华数码转印纸的生产工艺
技术领域
本发明涉及造纸工业技术领域,具体涉及一种低定量机内涂布热升华数码转印纸的生产工艺。
背景技术
热升华数码转印纸,定量30-100克,传统方式为机外涂布方式,即造纸厂生产数码转印原纸,涂布厂购入原纸经涂布加工后成为数码转印纸,经数码打印机打印图案后,经过热升华技术转移到布匹上,用于制作服装,窗帘,地毯等。机外涂布需要建设厂房仓储生活办公设施,购置涂布机和增加涂布操作及管理人员,投资费用大,人工成本高,另外机外涂布机车速慢(300m/min以下),涂布效率低,成本高,市场竞争力差。
如果直接在纸机内部利用膜转移施胶涂布机生产涂布热升华数码转印纸,纸机车速快(500m/min以上),干燥时间短,涂布量低(机外涂布量5-7g/m2,机内涂布量2.8-3.2g/m2),常规涂料配方无法满足机内涂布要求,需要研制干燥速度快、粘度低、颜色转移率高的涂料配方;另外,低定量机内涂布数码纸克重低,成纸强度差,断头多,挺度低,透气度高,涂布后容易打折,废品率高,在浆料化学品选型配比和磨浆工艺方面都需要研发能解决上述问题的工艺。
发明内容
针对现有技术的不足,本发明的目的是提供一种低定量机内涂布数码纸的生产工艺,生产出一款低定量机内涂布数码转印纸,更进一步降低生产成本,直接在纸机内部涂布生产数码转印纸,生产效率高,生产成本低,市场竞争力强。
本发明所述的低定量机内涂布热升华数码转印纸的生产工艺,包括以下步骤:
一、涂料的制备
(1)1#涂料的制备:
在涂料制备罐内加入水1500-1800质量份,开动搅拌器,转速900-1000r/min,依次加入质量份数计的重钙80-100份、轻钙80-100份、元明粉10-15份、CMC 240-300份,搅拌25-30min,再补加50-55℃的水调节固含量至15-16%,通入蒸汽调节温度至45-48℃,即得1#涂料,放入涂料储存桶待用;通入蒸汽有利于CMC的润涨溶解,并将温度稳定在45-48℃;所述重钙的粒径大于等于800目;
(2)2#涂料的制备:
按质量份数计将10-20份氧化木薯淀粉,100-160份水在淀粉调制罐混合均匀,提至淀粉蒸煮罐,升温至93-95℃,保温18-20min,然后降温至65-70℃,补加水调节固含量至6-8%,即得2#涂料,提至淀粉贮存罐备用;
(3)涂料过滤:
将1#涂料使用过滤器进行封闭筛选后,储存至上料桶;
二、原纸的制备
(4)磨浆:
将漂白硫酸盐针叶木浆、漂白硫酸盐阔叶木浆按质量比(3-4):(6-7)混合均匀后,在碎浆机碎解,采用三台DD720双盘磨串联打浆,第一台盘磨使用切割鳍型磨片,第二、三台盘磨采用扫帚鳍型磨片,得到成浆浆料;
(5)造纸:
在漂白硫酸盐针叶木浆和漂白硫酸盐阔叶木浆混合碎解时,依次加入填料180-200L/吨浆、阳离子木薯淀粉12-15kg/吨浆、硫酸铝5-8kg/吨浆、湿强剂18-24kg/吨浆、松香胶17-23kg/吨浆、CPAM 100-150g/吨浆、硅溶胶3-3.5kg/吨浆,并混合均匀,具体添加流程如图1所示,通过长网大缸纸机制备得28克热升华数码转印原纸;
三、原纸的涂布
(6)涂布:
采用膜转移涂布施胶机对原纸进行正反面涂布,其中正面(光滑面)计量棒型号U40,线压力20kN/m,涂布1#涂料,涂布量为2.8-3.2g/m2;反面(粗糙面)计量棒型号V30,线压力20kN/m,涂布2#涂料,涂布量为0.3-0.5g/m2
(7)烘干:
涂布完成后,成纸出膜转移涂布施胶机进入红外干燥箱,在340-360℃下烘干。
步骤(1)所述CMC为粘度为5mPa.s的CMC和粘度为10mPa.s的CMC质量比为(160-200):(80-100)的混合物。
步骤(1)所述1#涂料,45-48℃下的粘度为250-300mPa·s;步骤(2)所述2#涂料,65-70℃下的粘度为10-15mPa·s。
步骤(4)所述成浆浆料质量为叩解度43-47°SR,湿重2.5-3.5g。
步骤(5)所述长网大缸纸机车速为500-550m/min,大缸汽压为500-550kPa。
步骤(6)所述原纸进膜转移涂布施胶机前的成纸干度≥90%,出膜转移涂布施胶机的成纸干度≥70%。
步骤(6)所述1#涂料的涂布温度为45-48℃,所述2#涂料的涂布温度为65-70℃。
所述上料桶中的1#涂料通过过滤器筛选、在膜转移涂布施胶机下梁涂布后,多余的1#涂料通过60目的振动筛筛分后进入回流罐,从回流罐由泵提升至100目网筛过滤后回流到上料桶中。
所述过滤器为网目为200目、直径为500mm的缝筛自清洗刮刀过滤器(频率为10s/h)。
步骤(5)所述填料为60级浆钙。
所述阳离子木薯淀粉为取代度0.03的常规市售产品。
所述漂白硫酸盐针叶木浆优选为加拿大月亮牌的市售产品。
漂白硫酸盐阔叶木浆优选为巴西鹦鹉牌的市售产品。
所述硅溶胶主要成份为二氧化硅,生产厂家为浙江传化华洋化工有限公司。
所述湿强剂主要成份为聚酰胺多胺环氧氯丙烷,生产厂家为日本栗田水处理新材料有限公司。
与现有技术相比,本发明有益效果如下:
1.本发明所述的低定量机内涂布数码纸的生产工艺生产的低定量机内涂布数码纸的印花转移率不低于97%、其转印色彩可以达到使用要求。
2.本机内涂布数码纸涂布量2.8-3.2g/m2,机外涂布工艺的涂布量一般为5-7g/m2,要达到相同的印花转移率和转印色彩,涂料配方至关重要。CMC是热升华转印涂料的主要成分之一,由于CMC溶于水后具有一定的粘度和膨胀性,涂布后具有较好的成膜性能,涂布时能够以涂层的形式停留在纸张表面,有利于热升华油墨被涂层表面吸收,又可以阻止油墨向纸张纤维内部渗透,能有效提高热升华转印油墨的转印率,通入蒸汽有利于CMC的润涨溶解,并将温度稳定在45-48℃。
3.本发明选用粘度为5mPa.s的CMC和粘度为10mPa.s的CMC复配,目的是有效控制涂料的制备粘度满足高车速机内涂布的涂布量和干燥要求;重钙和轻钙也是热升华转印涂料的主要成分,是热升华油墨的主要承载体,能够提高印刷后油墨的干燥速率,缩短油墨干燥时间,并获得良好的转印效果;元明粉的作用是降低涂料粘度,提高涂料的流动性。
4.本发明正面涂布1#涂料,满足转移印花需求,反面涂布淀粉,防止纸页翘曲。
5.机内涂布使用纸机配备的膜转移施胶涂布机,本发明将原来表面施胶使用的涂布正面V型计量棒换成U型计量棒,由于机内涂布数码纸涂料粘度高,容易糊计量棒而导致纸页横幅涂布量不均匀,下游客户转移印花时易出现整幅印花颜色不均匀而导致印花布匹报废的问题。
6.机内涂布经膜转移涂布机上料后,后烘干部容易粘辊粘缸,造成涂层破坏而成为不合格品,本发明保证干燥箱温度提高到340-360℃,提高成纸干度,杜绝粘辊粘缸。
7.机内涂布热升华数码转印纸另一个困难问题是涂布时因涂料粘度大,其中的杂质分离不出来,造成的纸面涂布线问题,用户无法使用而成为废品,本发明选用直径500mm自清洗过滤器,网目200目,进行封闭筛选,筛选分离杂质彻底,解决涂布过程中产生的涂布线问题。
8.本发明采用酸性施胶,pH值在3.5-5.5,确保进膜转移涂布机前纸页熟化,控制涂料过量渗透到纸页内部,满足良好的热升华打印转印效果。
9.本发明还将1#涂料进行了回收处理,实现了资源的回收利用,绿色生产的同时降低了成本。
附图说明
图1为本发明低定量机内涂布热升华数码转印纸的生产工艺流程图;
图2为本发明1#涂料制备装置流程图;
图3为本发明2#涂料制备装置流程图。
具体实施方式
以下结合实施例对本发明作进一步说明,但本发明的保护范围不仅限于此。
实施例中用到的所有原料除特殊说明外,均为市购。
重钙:桂林金山新材料有限公司生产的800-1000目的重钙;
轻钙:桂林金山新材料有限公司生产的1200目的轻钙;
粘度为5mPa.s的CMC和粘度为10mPa.s的CMC:采购自常熟威怡科技有限公司;
氧化木薯淀粉:江西六合化工实业有限公司生产的FS-608;
松香胶:杭州杭化哈利玛化工有限公司生产的CEM-1735B阳离子松香胶;
阳离子木薯淀粉:取代度0.03的常规市售产品;
填料:山东昌乐金晖化工有限公司生产的固含量75%的60级浆钙;
硅溶胶:主要成份为二氧化硅,生产厂家为浙江传化华洋化工有限公司;
湿强剂:主要成份为聚酰胺多胺环氧氯丙烷,生产厂家为杭州传化华洋化工有限公司。
实施例1
所述的低定量机内涂布热升华数码转印纸的生产工艺,包括以下步骤:
一、涂料的制备
(1)1#涂料的制备:
在涂料制备罐内加入水1500质量份,开动搅拌器,转速950r/min,依次加入质量份数计的重钙90份、轻钙90份、元明粉15份、粘度为5mPa.s的CMC180份、粘度为10mPa.s的CMC90份,搅拌25min,再补加55℃的水调节固含量至15.5%,通入蒸汽调节温度至46℃,即得46℃下粘度为285mPa.s的1#涂料,放入涂料储存桶待用;
(2)2#涂料的制备:
按质量份数计将15份氧化木薯淀粉,130份水在淀粉调制罐混合均匀,提至淀粉蒸煮罐,升温至94℃,保温18min,然后降温至66℃,补加水调节固含量至6.9%,即得66℃下粘度为11mPa.s的2#涂料,提至淀粉贮存罐备用;
(3)涂料过滤:
将1#涂料使用网目为200目、直径为500mm的缝筛自清洗刮刀过滤器(频率为10s/h)进行封闭筛选后,储存至上料桶;
二、原纸的制备
(4)磨浆:
将漂白硫酸盐针叶木浆、漂白硫酸盐阔叶木浆按质量比4:6混合均匀后,在碎浆机碎解,采用三台DD720双盘磨串联打浆,第一台盘磨使用切割鳍型磨片,第二、三台盘磨采用扫帚鳍型磨片,得到成浆浆料,成浆浆料质量:叩解度45°SR,湿重3.0g;
(5)造纸:
在漂白硫酸盐针叶木浆和漂白硫酸盐阔叶木浆混合碎解时,依次加入填料200L/吨浆、阳离子木薯淀粉13kg/吨浆、硫酸铝6kg/吨浆、湿强剂20kg/吨浆、松香胶20kg/吨浆、CPAM 130g/吨浆、硅溶胶3.3kg/吨浆,并混合均匀,通过长网大缸纸机制备得28克热升华数码转印原纸;所述长网大缸纸机车速为510m/min,大缸汽压为530kPa;
三、原纸的涂布
(6)涂布:
采用膜转移涂布施胶机对原纸进行正反面涂布,其中正面(光滑面)计量棒型号U40,线压力20kN/m,涂布1#涂料,涂布温度为46℃,涂布量为3.0g/m2;反面(粗糙面)计量棒型号V30,线压力20kN/m,涂布2#涂料,涂布温度为67℃,涂布量为0.4g/m2;原纸进膜转移涂布施胶机前的成纸干度93%,出膜转移涂布施胶机的成纸干度75%。
(7)烘干:
涂布完成后,成纸出膜转移涂布施胶机进入红外干燥箱,在350℃下烘干。
所述上料桶中的1#涂料通过过滤器筛选、在膜转移涂布施胶机下梁涂布后,多余的1#涂料通过60目的振动筛筛分后进入回流罐,从回流罐由泵提升至100目网筛过滤后回流到上料桶中。
实施例2
所述的低定量机内涂布热升华数码转印纸的生产工艺,包括以下步骤:
一、涂料的制备
(1)1#涂料的制备:
在涂料制备罐内加入水1550质量份,开动搅拌器,转速960r/min,依次加入质量份数计的重钙80份、轻钙95份、元明粉10份、粘度为5mPa.s的CMC170份、粘度为10mPa.s的CMC80份,搅拌27min,再补加53℃的水调节固含量至15.9%,通入蒸汽调节温度至47℃,即得47℃下粘度为290mPa.s的1#涂料,放入涂料储存桶待用;
(2)2#涂料的制备:
按质量份数计将14份氧化木薯淀粉,140份水在淀粉调制罐混合均匀,提至淀粉蒸煮罐,升温至95℃,保温19min,然后降温至66℃,补加水调节固含量至7%,即得66℃下粘度为12mPa.s的2#涂料,提至淀粉贮存罐备用;
(3)涂料过滤:
将1#涂料使用网目为200目、直径为500mm的缝筛自清洗刮刀过滤器(频率为10s/h)进行封闭筛选后,储存至上料桶;
二、原纸的制备
(4)磨浆:
将漂白硫酸盐针叶木浆、漂白硫酸盐阔叶木浆按质量比3.5:6.5混合均匀后,在碎浆机碎解,采用三台DD720双盘磨串联打浆,第一台盘磨使用切割鳍型磨片,第二、三台盘磨采用扫帚鳍型磨片,得到成浆浆料,成浆浆料质量:叩解度46°SR,湿重3.1g;
(5)造纸:
在漂白硫酸盐针叶木浆和漂白硫酸盐阔叶木浆混合碎解时,依次加入填料190L/吨浆、阳离子木薯淀粉12kg/吨浆、硫酸铝5kg/吨浆、湿强剂22kg/吨浆、松香胶17kg/吨浆、CPAM 140g/吨浆、硅溶胶3.0kg/吨浆,并混合均匀,通过长网大缸纸机制备得28克热升华数码转印原纸;所述长网大缸纸机车速为530m/min,大缸汽压为545kPa;
三、原纸的涂布
(6)涂布:
采用膜转移涂布施胶机对原纸进行正反面涂布,其中正面(光滑面)计量棒型号U40,线压力20kN/m,涂布1#涂料,涂布温度为47℃,涂布量为3.1g/m2;反面(粗糙面)计量棒型号V30,线压力20kN/m,涂布2#涂料,涂布温度为66℃,涂布量为0.5g/m2;原纸进膜转移涂布施胶机前的成纸干度92%,出膜转移涂布施胶机的成纸干度79%。
(7)烘干:
涂布完成后,成纸出膜转移涂布施胶机进入红外干燥箱,在360℃下烘干。
所述上料桶中的1#涂料通过过滤器筛选、在膜转移涂布施胶机下梁涂布后,多余的1#涂料通过60目的振动筛筛分后进入回流罐,从回流罐由泵提升至100目网筛过滤后回流到上料桶中。
对比例1
所述的低定量机内涂布热升华数码转印纸的生产工艺,包括以下步骤:
一、涂料的制备
(1)1#涂料的制备:
在涂料制备罐内加入水1500质量份,开动搅拌器,转速950r/min,依次加入质量份数计的重钙92份、轻钙89份、元明粉14份、粘度为5mPa.s的CMC100份、粘度为10mPa.s的CMC40份,搅拌25min,再补加55℃的水调节固含量至15.6%,温度46℃,粘度为100mPa.s的1#涂料,放入涂料储存桶待用;
(2)2#涂料的制备:
按质量份数计将15份氧化木薯淀粉,130份水在淀粉调制罐混合均匀,提至淀粉蒸煮罐,升温至94℃,保温18min,然后降温至66℃,补加水调节固含量至6.9%,即得66℃下粘度为11mPa.s的2#涂料,提至淀粉贮存罐备用;
(3)涂料过滤:
将1#涂料使用网目为200目、直径为500mm的缝筛自清洗刮刀过滤器(频率为10s/h)进行封闭筛选后,储存至上料桶;
二、原纸的制备
(4)磨浆:
将漂白硫酸盐针叶木浆、漂白硫酸盐阔叶木浆按质量比4:6混合均匀后,在碎浆机碎解,采用三台DD720双盘磨串联打浆,第一台盘磨使用切割鳍型磨片,第二、三台盘磨采用扫帚鳍型磨片,得到成浆浆料,成浆质量:叩解度45°SR,湿重3.0g;
(5)造纸:
在漂白硫酸盐针叶木浆和漂白硫酸盐阔叶木浆混合碎解时,依次加入填料200L/吨浆、阳离子木薯淀粉12kg/吨浆、硫酸铝6.5kg/吨浆、湿强剂21kg/吨浆、松香胶19kg/吨浆、CPAM 130g/吨浆、硅溶胶3.4kg/吨浆,并混合均匀,通过长网大缸纸机制备得28克热升华数码转印原纸;所述长网大缸纸机车速为510m/min,大缸汽压为530kPa;
三、原纸的涂布
(6)涂布:
采用膜转移涂布施胶机对原纸进行正反面涂布,其中正面(光滑面)计量棒型号U40,线压力20kN/m,涂布1#涂料,涂布温度为47℃,涂布量为3.0g/m2;反面(粗糙面)计量棒型号V30,线压力20kN/m,涂布2#涂料,涂布温度为66℃,涂布量为0.4g/m2;原纸进膜转移涂布施胶机前的成纸干度92%,出膜转移涂布施胶机的成纸干度74%。
(7)烘干:
涂布完成后,成纸出膜转移涂布施胶机进入红外干燥箱,在350℃下烘干。
所述上料桶中的1#涂料通过过滤器筛选、在膜转移涂布施胶机下梁涂布后,多余的1#涂料通过60目的振动筛筛分后进入回流罐,从回流罐由泵提升至100目网筛过滤后回流到上料桶中。
对比例2
所述的低定量机内涂布热升华数码转印纸的生产工艺,包括以下步骤:
一、涂料的制备
(1)1#涂料的制备:
在涂料制备罐内加入水1560质量份,开动搅拌器,转速950r/min,依次加入质量份数计的重钙91份、轻钙91份、元明粉15份、粘度为5mPa.s的CMC180份、粘度为10mPa.s的CMC92份,搅拌25min,再补加55℃的水调节固含量至15.7%,温度46℃,粘度为280mPa.s的1#涂料,放入涂料储存桶待用;
(2)2#涂料的制备:
按质量份数计将16份氧化木薯淀粉,140份水在淀粉调制罐混合均匀,提至淀粉蒸煮罐,升温至94℃,保温18min,然后降温至66℃,补加水调节固含量至7%,即得66℃下粘度为11mPa.s的2#涂料,提至淀粉贮存罐备用;
(3)涂料过滤:
将1#涂料使用网目为200目、直径为500mm的缝筛自清洗刮刀过滤器(频率为10s/h)进行封闭筛选后,储存至上料桶;
二、原纸的制备
(4)磨浆:
将漂白硫酸盐针叶木浆、漂白硫酸盐阔叶木浆按质量比4:6混合均匀后,在碎浆机碎解,采用三台DD720双盘磨串联打浆,第一台盘磨使用切割鳍型磨片,第二、三台盘磨采用扫帚鳍型磨片,得到成浆浆料,成浆质量:叩解度45°SR,湿重3.0g;
(5)造纸:
在漂白硫酸盐针叶木浆和漂白硫酸盐阔叶木浆混合碎解时,依次加入填料200L/吨浆、阳离子木薯淀粉12kg/吨浆、硫酸铝6.4kg/吨浆、湿强剂20kg/吨浆、松香胶19kg/吨浆、CPAM 130g/吨浆、硅溶胶3.4kg/吨浆,并混合均匀,通过长网大缸纸机制备得28克热升华数码转印原纸;所述长网大缸纸机车速为520m/min,大缸汽压为540kPa;
三、原纸的涂布
(6)涂布:
采用膜转移涂布施胶机对原纸进行正反面涂布,其中正面(光滑面)计量棒型号v40,线压力20kN/m,涂布1#涂料,涂布温度为47℃,涂布量为2.5g/m2;反面(粗糙面)计量棒型号V30,线压力20kN/m,涂布2#涂料,涂布温度为66℃,涂布量为0.4g/m2;原纸进膜转移涂布施胶机前的成纸干度95%,出膜转移涂布施胶机的成纸干度78%。
(7)烘干:
涂布完成后,成纸出膜转移涂布施胶机进入红外干燥箱,在350℃下烘干。
所述上料桶中的1#涂料通过过滤器筛选、在膜转移涂布施胶机下梁涂布后,多余的1#涂料通过60目的振动筛筛分后进入回流罐,从回流罐由泵提升至100目网筛过滤后回流到上料桶中。
测试结果如下:
油墨印花转移率计算:
x为供给印版上的墨量;
y为转移到承印物上的墨量;
f为油墨的转移率;
则有:
f(%)=(y/x)*100%。
通过以上实施例和对比例可以看出,对比例1中降低1#涂料中cmc的用量,会导致成纸透气度提高,转移印花的转移率低于97%,且图案露白,无法满足客户需求;通过对比例2使用V型计量棒,涂布量出现降低现象,且转移颜色浅,有料线(布匹上有白色线),原因是涂料中杂质堵了计量棒,此处涂布量偏低,打印时墨水渗入纸页,在热升华时,吸附在纸页纤维上的墨水不易升华转出,造成此处有料线,而U型棒不易堵塞,故不存在此问题。

Claims (7)

1.一种低定量机内涂布热升华数码转印纸的生产工艺,其特征在于,包括以下步骤:
一、涂料的制备
(1)1#涂料的制备:
在涂料制备罐内加入水1500-1800质量份,开动搅拌器,转速900-1000r/min,依次加入质量份数计的重钙80-100份、轻钙80-100份、元明粉10-15份、CMC 240-300份,搅拌25-30min,再补加50-55℃温水调节固含量至15-16%,通入蒸汽调节温度至45-48℃,即得1#涂料,放入涂料储存桶待用;
(2)2#涂料的制备:
按质量份数计将10-20份氧化木薯淀粉,100-160份水在淀粉调制罐混合均匀,提至淀粉蒸煮罐,升温至93-95℃,保温18-20min,然后降温至65-70℃,补加水调节固含量至6-8%,即得2#涂料,提至淀粉贮存罐备用;
(3)涂料过滤:
将1#涂料使用过滤器进行封闭筛选后,储存至上料桶;
二、原纸的制备
(4)磨浆:
将漂白硫酸盐针叶木浆、漂白硫酸盐阔叶木浆按质量比(3-4):(6-7)混合均匀后,在碎浆机碎解,采用三台DD720双盘磨串联打浆,第一台盘磨使用切割鳍型磨片,第二、三台盘磨采用扫帚鳍型磨片,得到成浆浆料;
(5)造纸:
在漂白硫酸盐针叶木浆和漂白硫酸盐阔叶木浆混合碎解时,依次加入填料180-200L/吨浆、阳离子木薯淀粉12-15kg/吨浆、硫酸铝5-8kg/吨浆、湿强剂18-24kg/吨浆、松香胶17-23kg/吨浆、CPAM 100-150g/吨浆、硅溶胶3-3.5kg/吨浆,并混合均匀,通过长网大缸纸机制备得28g热升华数码转印原纸;
三、原纸的涂布
(6)涂布:
采用膜转移涂布施胶机对原纸进行正反面涂布,其中正面计量棒型号U40,线压力20kN/m,涂布1#涂料,涂布量为2.8-3.2g/m2;反面计量棒型号V30,线压力20kN/m,涂布2#涂料,涂布量为0.3-0.5g/m2
(7)烘干:
涂布完成后,成纸出膜转移涂布施胶机进入红外干燥箱,在340-360℃下烘干;
步骤(1)所述CMC为粘度为5mPa.s的CMC和粘度为10mPa.s的CMC质量比为(160-200):(80-100)的混合物;
所述过滤器为网目为200目的自清洗过滤器;步骤(4)所述成浆浆料质量为叩解度43-47°SR,湿重2.5-3.5g。
2.根据权利要求1所述的低定量机内涂布热升华数码转印纸的生产工艺,其特征在于,步骤(1)所述1#涂料,45-48℃下的粘度为250-300mPa•s;步骤(2)所述2#涂料,65-70℃下的粘度为10-15mPa•s。
3.根据权利要求1所述的低定量机内涂布热升华数码转印纸的生产工艺,其特征在于,步骤(5)所述长网大缸纸机车速为500-550m/min,大缸汽压为500-550kPa。
4.根据权利要求1所述的低定量机内涂布热升华数码转印纸的生产工艺,其特征在于,步骤(6)所述原纸进膜转移涂布施胶机前的成纸干度≥90%,出膜转移涂布施胶机的成纸干度≥70%。
5.根据权利要求1所述的低定量机内涂布热升华数码转印纸的生产工艺,其特征在于,步骤(6)所述1#涂料的涂布温度为45-48℃,所述2#涂料的涂布温度为65-70℃。
6.根据权利要求1所述的低定量机内涂布热升华数码转印纸的生产工艺,其特征在于,所述上料桶中的1#涂料通过过滤器筛选、在膜转移涂布施胶机下梁涂布后,多余的1#涂料通过振动筛筛分后进入回流罐,从回流罐由泵提升至网筛过滤后回流到上料桶中。
7.根据权利要求1所述的低定量机内涂布热升华数码转印纸的生产工艺,其特征在于,步骤(5)所述填料为60级浆钙。
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