2.7 Wrinkle:
A, failure phenomenon:
The surface defects such as wrinkles, gas lines, and moiré tend to occur during the drying and curing of the printing ink film and the coating film. Because the reasons are various, they can be divided into the following situations: (1) The wrinkles generated by a multi-color printing process; (2) The printing inks due to reprinting are not wrinkled. (3) When the ink or coating oil is formed at a high temperature, wrinkle cracking due to acid gas occurs; (4) There is a gas pattern when the humidity is large. The ink film or oil film thickness is easy to produce wrinkles, in order to cool the wind, it is easy to produce ripples.
B. Reasons:
Packaging printing ink system uses oxidation polymerization cross-linked curing alkyd resin, modified alkyd resin or dry oil, as they are used in ink printing, Varnish polishing, such as excessive use of cobalt driers, very easy to occur Wrinkle, this is because the surface of the ink layer or the oil layer absorbs the oxidative curing and the skinning, thus preventing the oxygen from penetrating into the ink film and the oil film layer. Therefore, the printing ink and the coated varnishes cause stress from above and below and cause wrinkles. It is also the reason that the stress generated by the cooling blow is caused by the warp. When the alkyd resin or styrene-modified alkyd resin ink system performs second or third overprinting or coating, if the underlying full ink layer or lacquer layer is not completely cured, it may be damaged. The solvent of the three-pass printing ink or varnish coating system swells and wrinkles. The cause of the gas streaks is often caused by the acid gas contained in the high-temperature gas that causes the catalysis of the ink and the varnish curing agent to cause the hardening of the ink film layer and the oil film layer, resulting in internal stress-induced wrinkling. In severe cases, ink or Varnish also produces wrinkling and crusting during ink fountain production. There is also the category of high solids UV oils and UV light oils that are prone to gas cracking in oxygen.
C. Countermeasures:
We appropriately select driers for ink and varnish formulation, especially focusing on the adjustment of the drying method and speed of alkyd inks or varnish, and controlling the thickness of the printing ink film and coating varnish oil film, thereby ensuring the The ink layer is cured uniformly to avoid wrinkles. The more important thing is to avoid the use of real solvents in the upper ink (or varnish). It is best to use a dilute solvent with a high volatility, and strictly control the interval between ink printing and varnish coating to ensure full-print or full-version printing. The coating layer can be fully cured before the second ink printing or coating glazing. This not only eliminates wrinkles due to bite bottoming or cross-coloring, such as inks containing light magnesium oxide or chlorinated polyolefins and alkyd resin binders that are printed on the undercoat inks, and the surface varnish is applied improperly or contains two Toluene and other true solvents easily aggregate and wrinkle.
The factors that affect gas cracking include acid gas, humidity, light, temperature, mixed impurities, film thickness, and too short contact time.
To reduce and avoid the slow migration of gas cracking, high boiling solvents, surfactants, and coupling agents are used. For example, water-based packaging printing inks and aqueous coating oil-added amines are all effective methods, and the effect of adding morpholine is better than others. In addition, it is necessary to strictly control the production environment of the ink during printing and varnish coating, and it is very beneficial to continuously increase the ventilation energy and avoid the mixing of foreign materials and dust.
A, failure phenomenon:
The surface defects such as wrinkles, gas lines, and moiré tend to occur during the drying and curing of the printing ink film and the coating film. Because the reasons are various, they can be divided into the following situations: (1) The wrinkles generated by a multi-color printing process; (2) The printing inks due to reprinting are not wrinkled. (3) When the ink or coating oil is formed at a high temperature, wrinkle cracking due to acid gas occurs; (4) There is a gas pattern when the humidity is large. The ink film or oil film thickness is easy to produce wrinkles, in order to cool the wind, it is easy to produce ripples.
B. Reasons:
Packaging printing ink system uses oxidation polymerization cross-linked curing alkyd resin, modified alkyd resin or dry oil, as they are used in ink printing, Varnish polishing, such as excessive use of cobalt driers, very easy to occur Wrinkle, this is because the surface of the ink layer or the oil layer absorbs the oxidative curing and the skinning, thus preventing the oxygen from penetrating into the ink film and the oil film layer. Therefore, the printing ink and the coated varnishes cause stress from above and below and cause wrinkles. It is also the reason that the stress generated by the cooling blow is caused by the warp. When the alkyd resin or styrene-modified alkyd resin ink system performs second or third overprinting or coating, if the underlying full ink layer or lacquer layer is not completely cured, it may be damaged. The solvent of the three-pass printing ink or varnish coating system swells and wrinkles. The cause of the gas streaks is often caused by the acid gas contained in the high-temperature gas that causes the catalysis of the ink and the varnish curing agent to cause the hardening of the ink film layer and the oil film layer, resulting in internal stress-induced wrinkling. In severe cases, ink or Varnish also produces wrinkling and crusting during ink fountain production. There is also the category of high solids UV oils and UV light oils that are prone to gas cracking in oxygen.
C. Countermeasures:
We appropriately select driers for ink and varnish formulation, especially focusing on the adjustment of the drying method and speed of alkyd inks or varnish, and controlling the thickness of the printing ink film and coating varnish oil film, thereby ensuring the The ink layer is cured uniformly to avoid wrinkles. The more important thing is to avoid the use of real solvents in the upper ink (or varnish). It is best to use a dilute solvent with a high volatility, and strictly control the interval between ink printing and varnish coating to ensure full-print or full-version printing. The coating layer can be fully cured before the second ink printing or coating glazing. This not only eliminates wrinkles due to bite bottoming or cross-coloring, such as inks containing light magnesium oxide or chlorinated polyolefins and alkyd resin binders that are printed on the undercoat inks, and the surface varnish is applied improperly or contains two Toluene and other true solvents easily aggregate and wrinkle.
The factors that affect gas cracking include acid gas, humidity, light, temperature, mixed impurities, film thickness, and too short contact time.
To reduce and avoid the slow migration of gas cracking, high boiling solvents, surfactants, and coupling agents are used. For example, water-based packaging printing inks and aqueous coating oil-added amines are all effective methods, and the effect of adding morpholine is better than others. In addition, it is necessary to strictly control the production environment of the ink during printing and varnish coating, and it is very beneficial to continuously increase the ventilation energy and avoid the mixing of foreign materials and dust.
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