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    瓦楞紙板的粘合與生產速度、溫度分析

    時間:2013-03-18    來源:中國包裝網

    瓦楞紙板的粘合強度是對瓦楞紙板進行物理性能檢驗的一個重要指標。瓦楞紙板的粘合過程包含著復雜的物理變化和化學變化,除主要取決于粘合劑的質量外,還取決于各種各樣條件的變化。粘合劑的理化指標包括粘度、PH值、糊化溫度、固體含量等指標。這些指標的變化直接影響瓦楞紙板的粘合強度 。雖然影響粘合強度還有其它方方面面的因素,但粘合劑本身的質量好壞是其主導因素。因此,在制作粘合劑時,應該做到以下幾方面:  

    1.使用的原輔材料質量要有保證

    2.投料時各種原輔材料計量要準確

    3.盡可能使用好的水質

    4.保證制作環境和場地的合適的溫度

    5.保證適當的粘度

    6.保證適當的濃度

    7.成品粘合劑沒有沉淀物

    8.成品粘合劑在存放和使用中粘度變化不大

    9.保證生產過程中有良好的初粘性、滲透性

    按照以上原則,在制作粘合劑時,嚴格按操作規程和工藝要求生產,同時考慮到各種因素的影響,以保證瓦楞紙板的粘合效果。

    良好的粘合應是涂在波形瓦楞紙和面紙之間的粘合劑經過高溫烘烤迅速糊化后,紙和粘合劑牢固結合,經專用設備和附件將其剝離時,撕裂的應是紙的纖維,而不應是粘合劑脫開。

    單面瓦楞機使用的粘合劑,在配制過程中,主要控制粘合劑的固體含量、糊化溫度和粘度。

    固體含量是指淀粉、燒堿、生膠專用干燥劑、硼砂在粘合劑中的含量,主要是指淀粉的用量,淀粉的含量多,固體含量就高。在使用過程中調整好涂膠輥的間隙,就可以提高車速,增加產量,同時便于烘干。配制粘合劑的固體含量約占粘合劑總量的20%左右為宜。

    糊化溫度是指粘合劑在生與熟的臨界溫度,當粘合劑的糊化溫度低時,在生產工藝中所消耗的熱量就少,因而可以提高車速。

    粘度是指在生產使用過程中粘合劑的流動能力。我們要求粘合劑低粘度,實際就是為了在使用中有良好的流動性。可以提高初粘力。配制熟漿是控制粘合劑粘度的關鍵。一要嚴格控制攪拌時間,當攪拌時間不夠時,粘合劑的粘度不穩定;二要掌握好燒堿及其它原料的配比。只有恰到好處的掌握粘合劑的固體含量、糊化溫度和粘度的相對關系,才能制作出質量好的粘合劑,從而保證在生產工藝中良好的粘合。

    在生產過程中,淀粉膠的粘度與溫度、燒堿用量成正比。在使用過程中,淀粉膠的粘度與溫度、攪拌速度成反比。為避免在使用過程中膠的粘度降低過快,盡量減少膠體循環及溫度的提高(如可將循環系統的齒輪泵改為氣泵,將大循環改為單循環)。

    1、單面機及三層線生產使用黏合劑粘度控制在:20-50秒,

    2、五層及七層線生產使用黏合劑粘度控制在:50-90秒,特殊情況,根據要求調節粘合劑粘度。

    瓦楞紙板生產線的速度和蒸氣壓力及溫度的關系(見表)

    速度(m/min)

    蒸氣壓力(MPa/cm2)

    溫度()

    30
    40
    50
    60
    80
    100
    150

    0.6
    0.7
    0.75
    0.8
    0.9
    1
    1.2

    150
    160
    165
    170
    175
    180
    185

    單面瓦楞機車速過快,要考慮波形瓦楞楞峰上的著膠量,這時的粘合劑固體含量要求高,否則影響粘合效果。

    單面瓦楞機車速過慢,會增大波形瓦楞楞峰的著膠量,同時,由于車速慢,過高的溫度會使粘合劑過早固化而失去良好的粘合效果,甚至用手一拍即會膠開。

    雙面機車速過快會造成波形瓦楞楞峰著膠量減少,同時由于過快的車速,使熱消耗增大,溫度降低,粘合劑糊化不好,造成粘結不良。

    雙面機車速過低會使波形瓦楞紙楞峰涂膠量增多,溫度聚集而過量烘烤瓦楞紙板,使粘合劑結構被破壞,造成瓦楞紙板焦脆。

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