Printing techniques are usually used for non-flat surface of the object, in a small area above the concave and convex surface of the product has obvious advantages. The use of metal and plastic-based industries, the main field of use for the toys and all kinds of advertising materials, such as bottle caps, plastic bottles, cars, household appliances, furniture, decorations, paper craft from the printing of plastic under the metal printing ink used in the field.
1, printing ink composition
Main ingredient is resin (one or more of the binders), pigments, solvents and additives, the following is the composition of:
Resin (accounting for 20%) ─ ─ ink used to form thin and connect coloring agent. Synthetic resin selection and the decision of the printing ink properties, such as the transfer of substrates and adhesion, gloss and chemical resistance. With different resins have different drying methods.
Color (accounting for 17%) ─ ─ brought to ink color and become opaque.
Solvent (accounting for 60%) ─ ─ resin pigment compounds that can be printed to the object, so that ink is more smooth and increased pigment stability. Solvent printing ink drying speed is the decisive factor, while the printing speed and adhesion are all factors. Printing will need more volatile solvent, but to choose the most appropriate depends on the other ingredients of ink what is the function because there is no solvent, so often need to combine multiple to use. Diluent contained in the solvent, diluent and mixed to achieve desired ink viscosity, it is easy to ink transfer.
Additives (accounting for 3%) ─ ─ that is additive, usually a small amount of use, its role is to regulate the characteristics of ink, printing ink can make a more smooth and increase the stability of pigment, the type has leveling agent, thickening agent and so on. But no matter what kind of ink, should be used each time the number with the number and mix, in order to ensure that the viscosity can be printed, printing ink should be adjusted to ensure the continuation of printing, the lack of additives will get easier Ling Ink crack, less tension and pigment separation.
Second, printing ink type
1) The ink according to the curing reaction can be divided into: physical drying inks (one component), chemical curing ink (two component). The former curing process is continued by the diluent evaporation process, the chemical composition of its ink and no fundamental changes, characterized by a slow curing, no other medium, sometimes as often used to accelerate the curing process under the conditions of oven heating ; the latter is a two-component in the curing process carried out by a chemical reaction, characterized by a relatively faster speed.
2) The ink can be divided according to their curing methods: thermal curing inks, UV curable ink. Mainly by heat curing to accelerate the curing process, heating, and some hot solid inks for the two-component inks resins connection does not occur at room temperature case, only in high temperature conditions. UV curable ink is emitted by UV lamps UV energy to accelerate curing.
Rely mainly on the transfer of printing ink solvent evaporation, evaporation of the ink film adhesive, and adjust ink adhesion. Transfer through the ink film to achieve good hiding power. UV curable inks are generally high-quality printing applications, the advantages are: steel plate printing ink is not dry; quality assurance; less wear on the steel; drying speed; non-solvent. The disadvantages are: high energy requirements; clean plastic head demanding; viscosity requirements as solvent-based inks; finesse than solvent ink printing.
3) The ink can be divided according to their composition: single-component ink and double (multiple) component ink. Single component by adding thinner ink printing available to the ideal viscosity, drying method for the physical vapor type, number of thermoplastic substrates, such as PS, PC, PVC will have a slight dissolution occurs, this solution to ink a direct bond with the substrate Therefore, scratch-resistant, good adhesion. Two-component ink higher chemical resistance, usually ink need to be added hardener.
4) How to choose the hardware that corresponds to the plastic ink pad
First, large objects than the tension ink, ink can not attach onto the surface geometry, to improve upon prior articles by the other methods, so I have to ink Youxiao to paste the object, the ink surface tension energy of the object to be lower than . When the object surface grease, dust or other additives, are required to pre-clean to ensure the best color results, in addition, there are many factors that will affect the ink performance, such as the object has a different approach and bake dry and so on. Therefore, before using the ink deal to make the right choice, test.
Automotive industry characteristics: mainly used in car decoration engine parts, the external surface, and other technology accessories, whether decorative or functional objects goods have highlighted the doctrine of personal taste, fashion, ink required to fully meet the automotive industry's quality and safety standard.
Recommended ink: Baolong PUR-ZK Series; T38 Series
Sports fields
Features: sporting goods used in wide range of applications under various conditions, shapes and matrix are different, their requirements inks have excellent chemical and mechanical tolerance, able to meet the design requirements, provide the color effects and levels of gloss and good color hiding
Recommended ink: Baolong KS-U series; Baolong PS Series; T01 Series
Toys in the field
Features: As a toy products, in addition to demand good chemical and mechanical tolerance, beautiful bright colors, the ink requirements of its most important environmental safety, ink must be free of heavy metals, and in accordance with EN71 toy standards, also asked not to be cyclohexanone with aromatic aromatic compounds
Substrate mostly: ABS, paint materials, acrylic acid salt, pretreatment PE, PP, PET, rigid PVC, paper, cardboard, SAN, PA recommends ink; Baolong KS-U series; Baolong PS Series; T40 series; T30 Series
Advertising, cosmetics field
Features: Ad Vision supplies a wide variety of substrates, ink demanding, may require various types of matrix firmly attached to the surface, but also for fast printing and drying of the ink
Substrate mostly: ABS, paint materials, acrylic acid salt, metal, pretreatment PE, PP, PET, PU and rigid PVC, paper, cardboard, SAN, PA Recommended ink: Baolong PUR-ZK Series; T18 Series ; T45 Series
Household appliances
Features: For decorative use of electrical and household appliances, decoration and marking must be able to withstand steam and high temperature, so the inks have excellent chemical and mechanical tolerance
Substrate mostly: ABS, paint materials, acrylic acid salt, metal, pretreatment PE, PP, PET and rigid PVC
Recommended ink: Baolong PUR-ZK Series; T38 Series
Plastic bottles category
Features: Multi-rotation for the plastic bottle, its multi-brand used to promote the position to require ink colorful glossy and highly opaque, strong adhesion properties
Substrate mostly: pre PE, PP, ABS, paint materials, acrylate, PS, PU
Recommended ink: Baolong PUR-ZK Series; T100 Series
Third, note pad printing ink
1) Temperature and time
Baking temperature and time depends on ink performance, quick drying of inks can achieve rapid curing at room temperature, the purpose of shorten the curing time after baking. The high temperature curing ink is easier to achieve at a high temperature curing, ink not curing, adhesion is not easy to meet the requirements.
2) printing layer thickness
Thick layer of ink color printing, baking time should be lengthened; UV thick layer of ink, curing difficulties, often leads to adhesion, abrasion and solvent resistance abnormal.
3) The ink ratio
Directly determine the ratio of ink printing ink after the performance, because the ink of different proportions, determine the effect of different printing, generally in accordance with the manufacturer to provide ink ratio of execution.
4) The amount of added diluent
Amount of added diluent printing directly affects the film thickness, adding too much thinner pad thickness, pad design, but prone to performance; added little thinner, pad thickness increases, printing prone to missing negative phenomena such as ink, printing products baked too long or less easy to cure UV inks
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