复合包装袋的白点和气泡! - 行业动态

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复合包装袋的白点和气泡!

发布日期:2019-06-24 作者:www.edkiller.com 点击:

  复合包装袋的白斑和气泡形状不同,气泡和白斑的概念也不相同。虽然它们被称为白斑和气泡,但它们中的大多数并不是相同的现象,形成机理也有很大的不同。所以白点和气泡是一个总称,值得分类研究。现在出现白点和气泡的原因如下:
  The shape of white spots and bubbles in composite packaging bags is different, and the concepts of bubbles and white spots are also different. Although they are called white spots and bubbles, most of them are not the same phenomena and their formation mechanisms are quite different. So white spots and bubbles are a general term, which deserve to be classified and studied. The reasons for the occurrence of white spots and bubbles are as follows:
  白斑起泡:(1)干透
  White spot blistering: (1) dry thoroughly
  (2)上胶量:监督,溶解性差,转移速度快。
  (2) Glue loading: supervision, poor solubility, fast transfer speed.
  (3)胶料调平后未调平:胶料分子量不够,胶辊温度过低,胶辊预热温度过低,无效
  (3) No leveling after leveling: the molecular weight of rubber is not enough, the temperature of COTS is too low, the preheating temperature of COTS is too low and ineffective.
  镀铝薄膜复合印刷基材如产生气泡,印刷薄膜在浅色部分出现白点。气泡部分的两层基材粘结不紧密,不一定是圆形凸起。但由于极度干燥而形成的气泡就像芝麻一样大。造成这种气泡的原因有一些是胶粘剂没有完全干燥,有一些是油墨溶剂干燥不够,经常出现大面积印刷。一些小型印刷机仍然使用红外线干燥箱。干燥稍差,虽然没有大气泡出现,但小到足以通过一些薄膜释放溶剂。在相同的工艺条件下,PET箔泡和BOPP箔泡在受热后会消失。
  Aluminum-coated composite printing substrates, such as bubbles, appear white spots in the light-colored part of the printing film. The two layers of base material in the bubble part are not bonded tightly, and are not necessarily circular bulges. But the bubbles formed by extreme drying are as big as sesame. Some of the reasons for this bubbles are that the adhesives are not completely dry, some are that the ink solvent is not dry enough, and large-scale printing often occurs. Some small printers still use infrared dryers. Drying is slightly worse, although no bubbles appear, but small enough to release solvents through some thin films. Under the same process conditions, PET and BOPP foil bubbles will disappear after heating.
  其次,干燥不良形成的小气泡与用放大镜产生的气泡量不足产生的气泡并没有很大的不同,此时需要进行合理的分析。用放大镜看任何光滑的表面都是凹凸不平的。它需要一定的厚度——也就是胶水的量——才能使表面变平。普通透明复合膜用低粘度胶粘剂。印刷膜要涂厚胶,如白膜、白膜下的色块厚度。在印刷复合油墨中树脂含量小于印刷表面的白膜,所以复合油墨的表面比较粗糙。粗苯是复合白油墨的优点,它有利于胶粘剂的渗透,产生足够的剥离强度,但反过来又需要更多的胶水。
  Secondly, the small bubbles formed by poor drying are not very different from the bubbles produced by inadequate amount of bubbles produced by magnifying glass, so reasonable analysis is needed at this time. Using a magnifying glass to see any smooth surface is bumpy. It requires a certain thickness, that is, the amount of glue, to flatten the surface. Low viscosity adhesives for common transparent composite membranes. Printing film should be coated with thick glue, such as white film, color block thickness under white film. The resin content of composite printing ink is less than the white film of printing surface, so the surface of composite printing ink is rough. Crude benzene is the advantage of composite white ink, it is conducive to the penetration of adhesives, producing enough peeling strength, but in turn requires more glue.
  为了保证油墨有足够的粘接剂厚度,胶水用量需要3-3.5g,低于本标准的胶水用量也是不够的。这是很容易理解的缺乏胶水由于堵塞。块二:突然,由于涂料的溶解性和操作转化率不断下降。这种挡板如没有及时找出消除的原因,只能靠停车橡皮擦维持一段时间。另一种挡块是渐进式的,严格地说,不能算是故障,因为不可能清洗每一个胶辊复合后的残胶,残胶在网孔底部日复一日地沉积和固化。胶量逐渐减少,小气泡也逐渐产生,由少到多,由小到大。最终由于一天做的产品和复合膜要求较高,小气泡变得难以忍受。这时要用一种特殊的洗涤液。问题解决了,但这不是一个好的生产习惯,因为有很多产品介于合格和不合格之间。我们提倡定期测量胶水量,当胶水量减少到预定值时清洗。
济南气泡袋
  In order to ensure that the ink has enough adhesive thickness, the glue dosage needs 3-3.5g, and the glue dosage below this standard is not enough. It is easy to understand the lack of glue due to blockage. Block 2: Suddenly, the solubility and Operational conversion of the paint are declining. If the reason for eliminating the baffle is not found in time, it can only be maintained by parking eraser for a period of time. Another kind of block is progressive. Strictly speaking, it can not be regarded as a fault, because it is impossible to clean the residual glue after each cot is compounded, and the residual glue deposits and solidifies day after day at the bottom of the mesh hole. The amount of glue decreases gradually, and small bubbles are produced gradually, from less to more, from small to large. Ultimately, small bubbles become intolerable due to the high requirements of products and composite membranes made in one day. A special detergent should be used. The problem has been solved, but this is not a good production habit, because there are many products between qualified and unqualified. We advocate regular measurement of glue volume and cleaning when the glue volume is reduced to a predetermined value.
  三、有时干的是满的,胶量不是很多,只是把复合膜或气泡去掉。事实上,不可能没有一点泡沫就把一个好的产品混合在一起。小气泡可以通过固化消除,因为没有溶剂但未完全固化的聚氨酯胶粘剂具有一定的流动性。温度越高,流量越大,分子量越小。固化的本质是增加分子量的过程。在固化室复合膜中,胶粘剂在温度的作用下缓慢流动,大气泡收缩,小气泡消失,直至胶粘剂分子量增加到无法流动的程度。有经验的操作人员可以看到白斑可以消失多大,如果不确定,最好将样品放入80度的烤箱中烤30分钟,检查气泡是否被去除。气泡大小相同,低粘度胶可以消除,而高粘度胶则不能,这是由于高粘度胶分子量为50%,流平性差。
  3. Sometimes the drying is full, and the glue content is not very large, but the composite film or bubbles are removed. In fact, it is impossible to mix a good product without a single bubble. Small bubbles can be eliminated by solidification because polyurethane adhesives without solvents but not fully solidified have certain fluidity. The higher the temperature, the larger the flow rate and the smaller the molecular weight. The essence of curing is the process of increasing molecular weight. In the composite film of curing chamber, the adhesives flow slowly under the action of temperature, the bubbles shrink, and the small bubbles disappear until the molecular weight of the adhesives increases to the extent that it can not flow. Experienced operators can see how much white spots can disappear. If they are not sure, it is best to bake the sample in an 80 degree oven for 30 minutes to check whether the bubbles have been removed. With the same bubble size, low viscosity gum can be eliminated, but high viscosity gum can not. This is because the molecular weight of high viscosity gum is 50%, and its leveling is poor.


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