冬季來臨，隨著冷空氣的來襲，多地出現(xiàn)了大風降溫天氣。氣溫驟降，除了會影響大家的出行之外，部分印刷工藝也會受到低溫天氣的影響。那么，在這種低溫天氣，山東印刷包裝需注意哪些細節(jié)呢？

Winter is coming. With the coming of cold air, strong wind and cooling weather have appeared in many places. The sudden drop in temperature will not only affect your travel, but also affect some printing processes. So, in this cold weather, what details should Shandong pay attention to when printing and packaging?

防止膠印油墨變稠

Prevent offset printing ink from thickening

對油墨來說，如果室溫和油墨的液溫如有大幅度的變化，油墨移流狀態(tài)就會發(fā)生變化，色調也會隨之發(fā)生變化。同時，低溫的天氣對高光部位的油墨轉移率會產生明顯影響。因此，在印刷產品時，無論如何要對印刷車間的溫濕度進行控制。另外，在冬季使用油墨時要提前預熱，以減少油墨本身的溫度變化。

For printing ink, if the room temperature and the liquid temperature of printing ink change significantly, the ink migration state will change, and the color will also change. At the same time, the low temperature weather will have a significant impact on the ink transfer rate in the high light areas. Therefore, when printing products, the temperature and humidity of the printing workshop should be controlled in any case. In addition, the ink should be preheated in advance when it is used in winter to reduce the temperature change of the ink itself.

由溫度引起的油墨變稠現(xiàn)象，可以用以下辦法：

The ink thickening caused by temperature can be solved by the following methods:

（1）將原墨放在暖氣片上或暖氣旁邊，使其緩慢升溫逐漸恢復到原狀。

(1) Place the original ink on the radiator or beside the heater, and make it slowly warm up and gradually return to its original state.

（2）急用時可使用開水進行外部加溫，具體方法是把開水倒入盆內，再將原桶墨放在水中，但要防止水蒸氣浸入，待水溫降到27攝氏度左右時取出，開蓋攪拌均勻即可使用。印刷車間的溫度以保持在27攝氏度左右為宜。

(2) In case of emergency, you can use boiled water for external heating. The specific method is to pour the boiled water into the basin, and then put the original bucket of ink in the water, but prevent the water vapor from being immersed. When the water temperature drops to about 27 ℃, take it out, open the lid and stir it evenly before use. The temperature of the printing workshop should be kept at about 27 ℃.

低溫天氣對紙張的影響

Influence of low temperature weather on paper

若環(huán)境溫濕度得不到良好控制，會導致紙張變形，影響正常印刷。因此，保持適宜的環(huán)境溫濕度是提高紙張印品品質和提高生產效率的關鍵。普通紙張對于環(huán)境溫度的要求不那么明顯，但當環(huán)境溫度低于10℃時，普通紙張就會變得很“脆”，印刷過程中墨層在其表面的附著力就會下降，容易造成脫墨現(xiàn)象。

If the ambient temperature and humidity are not well controlled, the paper will be deformed and normal printing will be affected. Therefore, maintaining the appropriate environmental temperature and humidity is the key to improve the quality of paper prints and improve production efficiency. The requirements for ambient temperature of ordinary paper are not so obvious, but when the ambient temperature is lower than 10 ℃, ordinary paper will become very "brittle", and the adhesion of the ink layer on its surface will decline during printing, which is easy to cause deinking.

金銀卡類紙張通常是以銅版紙、白板紙、白卡紙等為基材，然后再復合PET膜或鋁箔等材料生產而成，其對環(huán)境溫度的要求更高一些。這是因為金屬和塑料材質對于溫度的變化都非常敏感，當環(huán)境溫度低于10℃時，將大大影響金銀卡類紙張適性，當金銀卡類紙張的儲存環(huán)境溫度在0℃左右時，從紙庫運送到印刷車間后，其表面就會因溫差而出現(xiàn)大量水汽，影響正常印刷，甚會導致廢品出現(xiàn)。

Gold and silver card paper is usually made of coated paper, white board paper, white card paper and other substrates, and then compounded with PET film or aluminum foil and other materials, which requires higher environmental temperature. This is because both metal and plastic materials are very sensitive to temperature changes. When the ambient temperature is lower than 10 ℃, the suitability of gold and silver card paper will be greatly affected. When the storage ambient temperature of gold and silver card paper is about 0 ℃, after it is transported from the paper warehouse to the printing workshop, its surface will have a lot of moisture due to temperature difference, which will affect the normal printing, and even lead to waste products.

如果遇到上述問題，而且交貨期緊張，工作人員可先打開UV燈管讓紙張空跑一遍，使其溫度與環(huán)境溫度相平衡后再正式印刷。此外，低溫干燥，相對濕度低，紙張與空氣進行水分交換，紙張變干燥，變翹，收縮，會造成套印不良。

If the above problems are encountered, and the delivery date is tight, the staff can first turn on the UV lamp to let the paper run through the air, so that its temperature is balanced with the ambient temperature before formal printing. In addition, low temperature drying, low relative humidity, moisture exchange between paper and air, paper drying, warping, shrinkage, will cause poor overprint.

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