technological innovation

Selection guide for bronzing paste in garment printing process

In the process of clothing bronzing, because the fabric substrate itself is difficult to adhere to the gold foil coating, it is necessary to add a layer of bronzing glue on the fabric first. How to choose the bronzing paste in the production process? The following China hot stamping Network will introduce you in detail.
       The bronzing paste is synthesized using adhesives and other hot-melt materials, auxiliaries, etc., through the screen (80-120 mesh/im), the bronzing paste is printed on the substrates, and after the hot pressing, the galvanized aluminum foil (bronzing The film) is peeled from the polyester film and adhered to the substrate, so that a special and rich effect is formed on the substrate. It is a solid phase transfer printing process by hot stamping.
Gold foil printing process:
      Photo negatives → Screen printing plates → hot stamping → Hot stamping → Finished products
      Screen printing and hot stamping is a simple, low-cost method for hot stamping. Substrate to achieve a good gilded feel, washability, no shrinkage, good elasticity, without excessive hot pressing temperature, the key is - bronzing paste.
Table: Classification of hot stamping paste
Hand-printed hot stamping paste
Flat (cold) bronzing paste
Stereo bronzing paste
Mirror hot foil
Mechanical printing bronzing paste
Mechanical plane printing bronzing paste
Mechanical three-dimensional hot stamping paste
Mechanical special hot gold paste
Handicraft gold foil
Cloth bronzing paste (suedding process bronzing paste)
Paper stamping paste
Hand-printed hot stamping paste
      1. Manual flat hot stamping paste: It is an organic combination of acrylic emulsion and tackifying resin emulsion made of special acrylic copolymer. This improves the compatibility and stability of the emulsion, increases the peel strength of the emulsion, and enables the bronzing paste to be bronzing at low temperatures. Therefore, a lot of materials in cooperation with printing plants are also known as cold foil gold paste. Because the bronzing paste can rapidly form a film between 35°C and 120°C, it is the advantage of using the unique advantages of the initial viscosity of the resin emulsion to attach the bronzing paper to the bronzing paste. The characteristics of bronzing paste are: bronzing paste is thin, soft and elastic, and does not shrink. It is especially suitable for bronzing and hand-feeling manufacturers.
      2, three-dimensional hot foil paste: acrylic emulsion or EVA emulsion graft technology products. The most important feature of the three-dimensional hot stamping paste is its high solids content, which does not cause irregularities during use. The common screen (80-120 mesh/im) normally used can achieve the required film thickness through multiple printings. 3D printing effect, and then adjust the pressure and temperature of the transfer machine for hot stamping, forming a three-dimensional gold foil effect.
      3, mirror hot gold paste: mainly by EVA polymer copolymer hot melt powder synthesis and a gold foil paste. The appearance of the mirror bronzing pulp is milky white, because the bronzing paste contains a large amount of hot melt powder. When printing substrates, it is easy to fill the uneven surface of the substrate. After the hot stamping, the surface of the bronzing film is very smooth and very bright. , Reflective effect is very good there is a mirror effect. So someone called a mirror bronzing paste. The mirror bronzing paste contains hot melt powder, so in the hot pressing process, the bronzing temperature depends on the melting temperature of the hot melt powder in order to achieve a good wash fastness; this is also the reason that the feel of the mirror bronzing paste is harder than other bronzing pastes.
Mechanical printing bronzing paste
      1, mechanical plane printing bronzing pulp: different from manual flat bronzing pulp. The manual surface bronzing paste pursues a large initial surface adhesive force, while the surface of the mechanical printing bronzing paste requires a small initial initial adhesive force, and can not be adhered with a cloth bristles when the cloth is printed and rolled, otherwise it will affect the final quality of the product. The process of mechanical plane printing hot gold paste: fabric sizing → drying → collecting cloth → put cloth → hot stamping → forming. The mechanical plane bronzing paste has less sizing, so it has a good feel, but the flatness of the bronzing is not very good and the brightness is poor, so it is also known as frosting and bronzing.
      2, mechanical three-dimensional gold paste: Because of the special nature of mechanical printing, in order to be able to produce a 3D three-dimensional hot foil effect, mechanical printing machine can be repeated as many times as manual printing printing, so when setting production machinery printing hot gold paste formula, in Microcapsule foaming powder has been added to the production process. Using the working principle of the microcapsule foaming powder, the microcapsule foaming powder plays a key role in the process of printing overheating, which not only meets the requirements of the three-dimensional three-dimensional process, but also solves the technical requirements for the hot pressing and the hot pressing of the receiving and releasing fabrics. The disadvantage of the mechanical three-dimensional hot stamping paste is its poor elasticity.
      3, mechanical special hot gold paste: As we all know, many of the mechanical printing are active printing. In order to better achieve the other effects of printing, this year in the active printing, adding the coating bronzing process. The general paint printing is dry and wet printing process, PH value is neutral, and reactive printing is wet and wet printing process, PH value is not neutral, so there are new requirements in the market. The mechanical special hot stamping paste requires solving the problem of PH worthiness on the basis of the original. At present, this printing process has been successfully applied in mechanical printing plants, which saves time, saves production costs, and satisfies development requirements.
Handicraft gold foil
      1. Cloth bronzing paste (sneaker bronzing paste): The range of resin emulsions selected for fabric bronzing pulp is relatively large. Acrylic emulsion, tertiary vinegar emulsion, and EVA emulsion can all be used. Because in the application, fabric arts and crafts bronzing, under normal circumstances does not require washability, the requirements of the opponent is not very high, but the film is easy to print, the effect of strong hiding power, especially for dark cloth arts and crafts, It can not only cover the fluff, but also can easily block the suede cloth when it is overprinted to meet the requirements of the follow-up process, so that the gold foil paper can be easily pasted. Therefore, in the production of fabric bronzing paste with resin, it is necessary to add a certain amount of inorganic minerals to increase the hiding power. At the same time, it must be kept hot at a low temperature. (The pressing temperature is generally 30°C-45°C, and other parts can be maintained. On the hot, to maintain the cleanliness of the fabric screen).
      2, paper art gold paste: The main choice of vinyl acetate emulsion or EVA emulsion for use. This type of emulsion has excellent abrasion resistance, good adhesion, and overall leveling properties for paper arts, and is particularly suitable for use on paper. When printing or coating, the problem of tension on the surface of the paper and the problem of flowability of the paper are well solved, so that the gold foil on the paper exhibits a more even and rich effect.
      With the emergence of new products, bronzing paste is also continuously extended. In any case, the printing of bronzing paste must be uniform, the gluing must be smooth, the pre-baking and hot-pressing or hot-rolling should be controlled at a suitable temperature and time range to ensure the quality of the finished product. Added value and appreciation value of goods.