CN110952380A - 无塑纸杯纸的生产方法 - Google Patents
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Abstract
本发明属于造纸技术,涉及一种无塑纸杯纸的生产方法。其单涂无塑纸杯纸的生产方法包括以下步骤:1)涂料为水性热封胶,分为A型胶和B型胶,A型胶化学名称为乙烯甲基丙烯酸共聚物金属盐,B型胶为丙烯酸复配液;2)将A型胶和B型胶用去离子水稀释,分别放于涂布机上料槽中;3)在纸杯原纸的反面进行1道涂布或2道涂布,正面进行过水涂布;干燥箱温度80~160℃下干燥。本发明能够在纸杯原纸表面涂布特殊的符合食品级并可生物降解的涂料,并满足后续印刷、制杯、盛装热饮等的加工性能和使用性能要求。
Description
技术领域
本发明属于造纸技术,涉及一种无塑纸杯纸的生产方法。
背景技术
随着国内国际环保意识增强,现有生活用的一次性纸杯用于盛装热饮基本上均采用熔融指数(MI)7~8g/10min的低密度聚乙烯(LDPE)树脂的塑胶粒子通过挤出复合工艺经淋膜于纸杯原纸的表面,一般情况有单面淋膜的单PE纸杯纸和双面淋膜的双PE纸杯纸,虽然这种PE与纸张复合的纸杯与一次性塑料杯相比,更具有环保优势,其中的PE是生物降解塑料,但是PE属于破坏性生物降解塑料,仍然存在一次性降解难的环保问题。目前也有为数不多的厂家使用完全生物降解塑料PLA进行对纸杯原纸表面淋膜,PLA是聚乳酸(polylactic acid)的英文简称,是一种新型的生物基及可再生生物降解材料,但是PLA生物降解需要满足最基本的两个条件:50%-60%的湿度和50-70摄氏度的温度,还有PLA与纸复合的制杯加工性能不及PE纸杯纸。
发明内容
本发明所要解决的技术问题是,提供一种能够在纸杯原纸表面涂布特殊的符合食品级并可生物降解的涂料,并满足后续印刷、制杯、盛装冷饮和热饮等的加工性能和使用性能要求的无塑纸杯纸的生产方法。
本发明单涂无塑纸杯纸的生产方法包括以下步骤:
1)涂料制备:涂料为水性热封胶,分为A型胶和B型胶,A型胶化学名称为乙烯甲基丙烯酸共聚物金属盐,B型胶为丙烯酸复配液;所述A型胶乙烯甲基丙烯酸共聚物金属盐中金属离子是Li+1、K+1、Ca+2、Na+1、Mg+2、Al+3、Zn+2、Fe+2、Fe+3、Cu+2中的一种;所述B型胶丙烯酸复配液是2-丙烯酸丁酯与苯乙烯和丙烯腈的聚合物。
2)将所述A型胶和B型胶用去离子水稀释,分别存放于涂布机上料槽中,控制固含量质量百分比为10~35%,检测固含量、粘度、pH值,备用。
3)单涂无塑纸杯纸制备:在纸杯原纸的反面进行1道或2道涂布,正面进行过水涂布(即涂料为水);反面进行1道涂布时,涂B型胶或A型胶,控制涂布量1~10g/m2;反面进行2道涂布时,反面第一道涂布涂A型胶,控制涂布量1~5g/m2,反面第二道涂布涂B型胶或A型胶,控制涂布量1~5g/m2;干燥箱温度80~160℃下干燥;控制反面吸水性(Cobb60s)≤1.0g/m2、反面耐液性(达因液)≤50级。
本发明双涂无塑纸杯纸的生产方法包括以下步骤:
1)涂料制备:涂料为水性热封胶,分为A型胶和B型胶,A型胶化学名称为乙烯甲基丙烯酸共聚物金属盐,B型胶为丙烯酸复配液;所述述A型胶乙烯甲基丙烯酸共聚物金属盐中金属离子是Li+1、K+1、Ca+2、Na+1、Mg+2、Al+3、Zn+2、Fe+2、Fe+3、Cu+2中的一种;所述B型胶丙烯酸复配液是2-丙烯酸丁酯与苯乙烯和丙烯腈的聚合物。
2)将所述A型胶和B型胶用去离子水稀释,分别存放于涂布机上料槽中,控制固含量质量百分比为10~35%,检测固含量、粘度、pH值,备用。
3)双涂无塑纸杯纸制备:在纸杯原纸的反面进行1道或2道涂布,正面进行单次涂布;反面进行1道涂布时,涂B型胶或A型胶,控制涂布量1~10g/m2;反面进行2道涂布时,反面第一道涂布涂A型胶,控制涂布量1~5g/m2,反面第二道涂布涂B型胶或A型胶,控制涂布量1~5g/m2;正面单次涂布,涂B型胶或A型胶,控制涂布量1~5g/m2;干燥箱温度80~160℃下干燥;控制正面和反面吸水性(Cobb60s)≤15.0/1.0g/m2、反面耐液性(达因液)≤50级。
进一步的,在上述单涂无塑纸杯纸、双涂无塑纸杯纸的制备步骤后,对纸样进行检测包括以下步骤:
1)上涂量检测:取样时将涂布机涂料装置脱离,脱离的纸间距不大于2m,并注好标记,在干燥箱与卷取装置之间用取样器取样,测定前后对应点的已涂布与未涂布纸样,按《GB/T451.2纸和纸板定量的测定方法》测定定量,计算出涂布量=已涂布纸张定量-未涂布纸张定量;
2)耐液性(达因液)检测:测试液为标准等级的达因液,达因液检测的等级分别为50级、40级、38级、34级时,表示可分别供咖啡、啤酒、黄酒、白酒使用,达因液检测的等级越低,说明耐液性能越好;取100mm×100mm试样,在纸样反面涂布面用滴管在距纸面约10mm高处滴1滴已知等级的测试液至试样表面,滴管应倾斜约450角,以使每滴液量为0.06mL;2秒后迅速用吸收纸或棉织品擦除多余的测试溶液,同时立即检查测试溶液滴到的区域;如果测试溶液滴到的区域完全无吸收,则换低一级的测试液进行测试,直至测试溶液滴到的区域变暗即到达测试终点,确定为前面高的一级为测试结果;
3)吸水性按照《GB/T 1540纸和纸板吸水性的测定(可勃法)》进行;
4)厚度按《GB/T451.3纸和纸板厚度的测定方法》进行;
5)制杯观察有无渗漏性:在常规PE纸杯的制杯机上进行制杯试验,要求制杯时反面朝里、制成的纸杯检查杯底和侧封粘合均完好,无塑纸杯再进行盛装热开水、热咖啡两种介质的渗漏试验,要求纸杯渗漏试验时放置半小时观察无渗漏现象;
6)生物降解试验:将试样粉碎成小于5cm2的小块,完全填埋于具有水保持能力和特定湿度(60%±5%)的自然土壤的装置中培养,9个月后取出,检测其剩余有机物质量。
本发明的优点体现在:
1、通过使用一种或几种特殊涂料在涂布机上对纸杯原纸进行超低量单面涂布生产出单涂无塑纸杯纸,或者通过使用一种或几种特殊涂料在涂布机上对纸杯原纸进行超低量双面涂布,生产出双涂无塑纸杯纸。无塑纸杯纸的涂布量较低,总涂布量仅1~10g/m2。
2、无塑纸杯纸的吸水性较低,反面吸水性(Cobb60s)≤1.0g/m2、反面耐液性(达因液)≤50级、双涂无塑纸杯纸正面吸水性(Cobb60s)≤15.0g/m2。
3、产品在原有做PE纸杯的制杯机上进行制杯时,杯底和侧封粘合完好,经制成的纸杯再进行盛装热开水、热咖啡两种介质的渗漏试验,放置半小时均无渗漏现象。
4、产品经生物降解试验,其剩余有机物质量≤5%,完全可替代现有PE纸杯应用于各类场合。
具体实施方式
下面结合具体实施例对本发明做进一步的说明。
实施例1,250+5g/m2单涂无塑纸杯纸(反面2道涂布)生产步骤
1)特殊涂料制备:将特殊涂料水性热封胶A型胶乙烯甲基丙烯酸共聚物金属Na+1盐胶、B型胶2-丙烯酸丁酯与苯乙烯和丙烯腈的聚合物分别存放于涂布机第一道、第二道上料槽中,用去离子水稀释,控制固含量质量百分比20%,检测固含量、粘度、pH值,备用。
2)单涂无塑纸杯纸:使用250g/m2纸杯原纸,在纸杯原纸的反面进行超低量2道涂布,第一道涂布涂A型金属Na+1盐胶,控制涂布量2.5±0.5g/m2、第二道涂布涂B型胶,控制涂布量2.5±0.5g/m2,干燥箱温度130℃。检测产品的上涂量、吸水性和耐液性(达因液)等指标,控制反面吸水性(Cobb60s)≤1.0g/m2、反面耐液性(达因液)≤50级。
3)检测,取250+5g/m2单涂无塑纸杯纸的纸样在原有做PE纸杯的制杯机上进行制杯试验,要求制杯时反面朝里,观察杯底和侧封粘合完好,制成的纸杯再进行盛装热开水、热咖啡两种介质的渗漏试验,放置半小时观察均无渗漏现象。
其它物性指标检测结果详见表1。
表1 250+5g/m2单涂无塑纸杯纸物性指标检测数据
项目 | 标准 | 检测数据 |
定量g/m<sup>2</sup> | 255±6 | 255.2 |
厚度μm | / | 325 |
上涂量g/m<sup>2</sup> | 5±1 | 5.2 |
反面吸水性(Cobb<sub>60s</sub>)g/m<sup>2</sup> | ≤1.0 | 0.70 |
反面耐液性(达因液)级 | ≤50 | 38 |
生物降解剩余有机物质量% | ≤5 | 4.2 |
实施例2,210+5g/m2单涂无塑纸杯纸(反面1道涂布)生产步骤
1)特殊涂料制备:将特殊涂料水性热封胶A型胶乙烯甲基丙烯酸共聚物金属Na+1盐胶存放于涂布机第一道上料槽中,用去离子水稀释,控制固含量质量百分比20%,检测固含量、粘度、pH值,备用。
2)单涂无塑纸杯纸:使用210g/m2纸杯原纸,在纸杯原纸的反面进行超低量1道涂布,涂A型金属Na+1盐胶,控制涂布量5±1g/m2,干燥箱温度130℃。检测产品的上涂量、吸水性和耐液性(达因液)等指标,控制反面吸水性(Cobb60s)≤1.0g/m2、反面耐液性(达因液)≤50级。
3)检测,取210+5g/m2单涂无塑纸杯纸的纸样在原有做PE纸杯的制杯机上进行制杯试验,要求制杯时反面朝里,观察杯底和侧封粘合完好,制成的纸杯再进行盛装热开水、热咖啡两种介质的渗漏试验,放置半小时观察均无渗漏现象。
其它物性指标检测结果详见表2。
表2 210+5g/m2单涂无塑纸杯纸物性指标检测数据
项目 | 标准 | 检测数据 |
定量g/m<sup>2</sup> | 215±6 | 215.1 |
厚度μm | / | 275 |
上涂量g/m<sup>2</sup> | 5±1 | 5.5 |
反面吸水性(Cobb<sub>60s</sub>)g/m<sup>2</sup> | ≤1.0 | 0.60 |
反面耐液性(达因液)级 | ≤50 | 38 |
生物降解剩余有机物质量% | ≤5 | 4.1 |
实施例3,2+250+5g/m2双涂无塑纸杯纸(反面2道涂布)生产步骤
1)特殊涂料制备:将特殊涂料水性热封胶A型乙烯甲基丙烯酸共聚物金属Fe+2盐胶、B型胶、A型乙烯甲基丙烯酸共聚物金属Zn+2盐胶分别存放于涂布机第一道、第二道、正面上料槽中,用去离子水稀释,控制固含量质量比20%,检测固含量、粘度、pH值,备用。
2)双涂无塑纸杯纸:使用250g/m2纸杯原纸,在纸杯原纸的反面进行超低量2道涂布,第一道涂布涂A型金属Fe+2盐胶,控制涂布量2.5±0.5g/m2、第二道涂布涂B型胶,控制涂布量2.5±0.5g/m2,正面单次涂布,涂A型金属Zn+2盐胶,控制涂布量2±0.5g/m2;干燥箱温度140℃。检测产品的上涂量、吸水性和耐液性(达因液)等指标,控制吸水性(正面/反面,Cobb60s)≤15.0/1.0g/m2、反面耐液性(达因液)≤50级。
3)检测,取2+250+5g/m2双涂无塑纸杯纸的纸样在原有做PE纸杯的制杯机上进行制杯试验,要求制杯时反面朝里,观察杯底和侧封粘合完好,制成的纸杯再进行盛装热开水、热咖啡两种介质的渗漏试验,放置半小时观察均无渗漏现象。
其它物性指标检测结果详见表3。
表3 2+250+5g/m2双涂无塑纸杯纸物性指标检测数据
通过使用一种或几种特殊涂料在涂布机上对纸杯原纸进行超低量单面涂布生产出单涂无塑纸杯纸;通过使用一种或几种特殊涂料在涂布机上对纸杯原纸进行超低量双面涂布,生产出双涂无塑纸杯纸。无塑纸杯纸的涂布量较低,实现了超低量涂布,250+5g/m2单涂无塑纸杯纸为反面2道涂布,涂布量5.2g/m2;210+5g/m2单涂无塑纸杯纸反面1道涂布,涂布量5.5g/m2;2+250+5g/m2双涂无塑纸杯纸为反面2道涂布,涂布量5.4g/m2,正面单次涂布,涂布量1.9g/m2。无塑纸杯纸的吸水性较低,反面吸水性(Cobb60s)≤1.0g/m2、双涂无塑纸杯纸的正面吸水性(Cobb60s)≤15.0g/m2。反面耐液性(达因液)达到34~38级,达因液检测的等级为50级、40级、38级、34级时,分别表示可供咖啡、啤酒、黄酒、白酒使用,达因液检测的等级越低,说明耐液性能越好。产品在原有做PE纸杯的制杯机上进行制杯时,杯底和侧封粘合完好,经制成的纸杯再进行盛装热开水、热咖啡两种介质的渗漏试验,放置半小时无渗漏现象。产品经生物降解试验,其剩余有机物质量≤5%。说明无塑纸杯纸完全可替代现有PE、PLA纸杯应用各类场合。
Claims (4)
1.一种单涂无塑纸杯纸的生产方法,其特征是:包括以下步骤,
1)涂料制备:涂料为水性热封胶,分为A型胶和B型胶,A型胶化学名称为乙烯甲基丙烯酸共聚物金属盐,B型胶为丙烯酸复配液;所述A型胶乙烯甲基丙烯酸共聚物金属盐中金属离子是Li+1、K+1、Ca+2、Na+1、Mg+2、Al+3、Zn+2、Fe+2、Fe+3、Cu+2中的一种;所述B型胶丙烯酸复配液是2-丙烯酸丁酯与苯乙烯和丙烯腈的聚合物;
2)将所述A型胶和B型胶用去离子水稀释,分别存放于涂布机上料槽中,控制固含量质量百分比为10~35%,检测固含量、粘度、pH值,备用;
3)单涂无塑纸杯纸制备:在纸杯原纸的反面进行1道或2道涂布,正面进行过水涂布;反面进行1道涂布时,涂B型胶或A型胶,控制涂布量1~10g/m2;反面进行2道涂布时,反面第一道涂布涂A型胶,控制涂布量1~5g/m2;反面第二道涂布涂B型胶或A型胶,控制涂布量1~5g/m2;干燥箱温度80~160℃下干燥;控制反面吸水性(Cobb60s)≤1.0g/m2、反面耐液性(达因液)≤50级。
2.根据权利要求1所述的单涂无塑纸杯纸的生产方法,其特征是:
在所述各步骤后对纸样进行检测,包括以下步骤,
1)上涂量检测:取样时将涂布机涂料装置脱离,脱离的纸间距不大于2m,并注好标记,在干燥箱与卷取装置之间用取样器取样,测定前后对应点的已涂布与未涂布纸样,按《GB/T451.2 纸和纸板定量的测定方法》测定定量,计算出涂布量=已涂布纸张定量-未涂布纸张定量;
2)耐液性(达因液)检测:测试液为标准等级的达因液,达因液检测的等级分别为50级、40级、38级、34级时,表示可分别供咖啡、啤酒、黄酒、白酒使用,达因液检测的等级越低,说明耐液性能越好;取100mm×100mm试样,在纸样反面涂布面用滴管在距纸面约10mm高处滴1滴已知等级的测试液至试样表面,滴管应倾斜约450角,以使每滴液量为0.06mL;2秒后迅速用吸收纸或棉织品擦除多余的测试溶液,同时立即检查测试溶液滴到的区域;如果测试溶液滴到的区域完全无吸收,则换低一级的测试液进行测试,直至测试溶液滴到的区域变暗即到达测试终点,确定为前面高的一级为测试结果;
3)吸水性检测;
4)厚度检测;
5)制杯观察有无渗漏性:在常规PE纸杯的制杯机上进行制杯试验,要求制杯时反面朝里、制成的纸杯检查杯底和侧封粘合均完好,无塑纸杯再进行盛装热开水、热咖啡两种介质的渗漏试验,要求纸杯渗漏试验时放置半小时观察无渗漏现象;
6)生物降解试验:将试样粉碎成小块,完全填埋于具有水保持能力和湿度为60%±5%的自然土壤的装置中培养,9个月后取出,检测其剩余有机物质量。
3.一种双涂无塑纸杯纸的生产方法,其特征是:包括以下步骤,
1)涂料制备:涂料为水性热封胶,分为A型胶和B型胶,A型胶化学名称为乙烯甲基丙烯酸共聚物金属盐,B型胶为丙烯酸复配液;所述述A型胶乙烯甲基丙烯酸共聚物金属盐中金属离子是Li+1、K+1、Ca+2、Na+1、Mg+2、Al+3、Zn+2、Fe+2、Fe+3、Cu+2中的一种;所述B型胶丙烯酸复配液是2-丙烯酸丁酯与苯乙烯和丙烯腈的聚合物;
2)将所述A型胶和B型胶用去离子水稀释,分别存放于涂布机上料槽中,控制固含量质量百分比为10~35%,检测固含量、粘度、pH值,备用;
3)双涂无塑纸杯纸制备:在纸杯原纸的反面进行1道或2道涂布,正面进行单次涂布;反面进行1道涂布时,涂B型胶或A型胶,控制涂布量1~10g/m2;反面进行2道涂布时,反面第一道涂布涂A型胶,控制涂布量1~5g/m2;反面第二道涂布涂B型胶或A型胶,控制涂布量1~5g/m2;正面单次涂布,涂B型胶或A型胶,控制涂布量1~5g/m2;干燥箱温度80~160℃下干燥;控制正面和反面吸水性(Cobb60s)≤15.0/1.0g/m2、反面耐液性(达因液)≤50级。
4.根据权利要求3所述的双涂无塑纸杯纸的生产方法,其特征是:
在所述各步骤后对纸样进行检测,包括以下步骤,
1)上涂量检测:取样时将涂布机涂料装置脱离,脱离的纸间距不大于2m,并注好标记,在干燥箱与卷取装置之间用取样器取样,测定前后对应点的已涂布与未涂布纸样,按《GB/T451.2 纸和纸板定量的测定方法》测定定量,计算出涂布量=已涂布纸张定量-未涂布纸张定量;
2)耐液性(达因液)检测:测试液为标准等级的达因液,达因液检测的等级分别为50级、40级、38级、34级时,表示可分别供咖啡、啤酒、黄酒、白酒使用,达因液检测的等级越低,说明耐液性能越好;取100mm×100mm试样,在纸样反面涂布面用滴管在距纸面约10mm高处滴1滴已知等级的测试液至试样表面,滴管应倾斜约450角,以使每滴液量为0.06mL;2秒后迅速用吸收纸或棉织品擦除多余的测试溶液,同时立即检查测试溶液滴到的区域;如果测试溶液滴到的区域完全无吸收,则换低一级的测试液进行测试,直至测试溶液滴到的区域变暗即到达测试终点,确定为前面高的一级为测试结果;
3)吸水性检测;
4)厚度检测;
5)制杯观察有无渗漏性:在常规PE纸杯的制杯机上进行制杯试验,要求制杯时反面朝里、制成的纸杯检查杯底和侧封粘合均完好,无塑纸杯再进行盛装热开水、热咖啡两种介质的渗漏试验,要求纸杯渗漏试验时放置半小时观察无渗漏现象;
6)生物降解试验:将试样粉碎成小块,完全填埋于具有水保持能力和湿度为60%±5%的自然土壤的装置中培养,9个月后取出,检测其剩余有机物质量。
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