The reasons and solutions for pinhole whitening appear in full-plate printing inks

Gauke heavy, high resistance to broken hanging face leather carton paper processing and manufacturing of notebook computers, liquid crystal display box products, full-edition black printing easy to have pinhole dew white phenomenon, why bad printing?
Printing poor cause analysis
the current domestic paper mill production of gauke weight (200 to 300g/m2), high resistance to breaking the original color hanging face leather box board raw paper, is generally three-fold mesh molding, wherein the surface layer with unbleached sulfate wood pulp plus part of the United States waste, core bottom two layers with 100% waste. The suitable printing performance of its surface is affected by the following factors:
(1) surface adhesive
original paper in order to improve its cracking and moisture resistance performance, are currently using surface adhesive process, and most of the immersion glue. At present, corrugated cartons mostly use environmentally friendly water-based flexible printing, which is very sensitive to the original paper surface adhesive process requirements

.
glue is not good, will lead to a larger surface water absorption, after product packaging storage, transport process is easy to return to moisture, carton pressure strength reduced resulting in collapse of the box. Glue is too good, carton moisture-proof performance is good, but will affect the carton production process ink absorption performance, affect the printing effect, especially full-plate field and dot printing.
(2) Waste boxboard paper as raw materials accounted for a relatively large proportion
due to growing concerns about environmental protection, the use of recyclable, recyclable materials is being encouraged. Whole wood pulp packaging raw paper is rarely used in the international, in China's relatively poor forest resources under the premise of the production of high-strength box board original paper using waste box board paper as raw materials accounted for a relatively large.
Because the waste box board paper contains more impurities such as adhesives, resulting in the papermaking process, taking into account the fiber retention rate and system processing capacity factors, paddle material sand removal, heat dispersion and other processes are difficult to paddle material non-fibrous material treatment clean.
these sticky substances and dust attached to the surface fibers of the original paper directly lead to dewy whitening during the watery full plate printing process.
5 kinds of improvement measures
for the more typical full-print pinhole dew phenomenon, we generally consider from the human, machine, material, method, environment:
(1) change ink, use more high-grade ink, because high-grade ink slurry particles are finer, more uniform distribution in solvents;
(2) increase the amount of ink appropriately;
(3) adjust the PH value of ink and ink and add chemical additives;
(4) special treatment of cardboard surfaces;
(5) optimize the raw paper hanging surface layer process.
Recommendations: as little as possible the use of large-area full-print field printing
In addition, in the packaging design should also be noted that full-edition black field design does have the following adverse effects:
(1) is not conducive to environmental protection, increase the difficulty of packaging recycling
And waste box board paper after a large area of black printing, in the raw materials copied again as raw materials in pulping, sand removal, heat dispersion process will consume a lot of energy, and affect production efficiency. In addition, the waste water treatment costs generated in the papermaking process will also increase, which is not conducive to energy conservation and emission reduction and energy consumption.
(2) Waste of resources
Full-plate printing will consume a lot of ink in the production process of cartons, and produce such as printing running position, whitewing, blurred handwriting, color difference and other bad, resulting in increased bad rate in the production process of cartons. In order to reduce the undesirable rate, carton factories will spend a lot of manpower and material resources to make temporary remedial measures. For printing dewy poor cartons, use workers hand-painted.
(3) packaging costs increased
cartons after a large area of full printing, due to convex water-type printing pressure caused by cardboard corrugated deformation, thickness reduction, cardboard edge pressure reduction, empty box after the box pressure strength decreased, increasing the logistics process collapse, packaging damage risk. Therefore, cartons in the strength design must take into account its safety factor, increase the weight and grade of carton materials, which will also lead to higher packaging costs.
the above reasons, it is suggested that under the premise of not affecting product sales, the design should go out of the wrong way, without affecting the packaging display function, as little as possible to use a large area of full-scale field printing.
。