Factors affecting the quality of hot stamping
Time:2024-04-23
Views:1005
After a comprehensive analysis of various aspects, we believe that the factors affecting the quality of hot stamping are mainly the following six aspects.
Stamping temperature
According to the aluminum carbide stamping suitability to determine the general temperature range of 85 ~ 130 ℃ is appropriate.
Stamping pressure
According to the thickness of the stamping product paper, aluminum transfer performance to determine the appropriate stamping pressure, should not be too large or too small.
Stamping speed
According to the transfer performance of aluminum carbide to select the stamping speed, in order to ensure the stability of the stamping quality, stamping speed can be higher.
Flat stamping machine general maximum stamping speed control in 5000 sheets / hour, round press round stamping machine best stamping speed control in 80 ~ 110 m / min appropriate.
Aluminum carbide stamping suitability impact
(1) The composition of electrified aluminum: electrified aluminum by PET base film layer, peeling layer, coloring layer, aluminized layer and adhesive layer, as shown in Figure 2.
(2) The impact of the peeling layer on the quality of hot stamping: aluminum carbide peeling layer in the hot stamping process, under certain temperature conditions (such as 120 ℃) occurs gasification, so that the other layers and PET base film layer separation. Peeling layer is too tight, the gasification reaction is not complete, easy to produce stamping sand lack of quality failure; on the contrary, peeling layer is too loose, the gasification reaction is more complete, the base film layer and the other layers are separated completely, which is the premise of the electrochemical aluminum to achieve a good transfer, but prone to stamping paste plate, the edge of the burr of the stamping faults, so the peeling layer of the degree of tightness should be moderate.
(3) the adhesive layer on the stamping quality: aluminum carbide adhesive layer in the stamping process, in certain temperature conditions (such as 120 ℃) occurs in the adhesive layer softening or liquefaction, so that the coloring layer, aluminized layer bonded to the substrate PET. Adhesive layer softening point is too high, the adhesive layer is not easy to liquefy or partial liquefaction is not complete, resulting in adhesion with the substrate is not solid, easy to produce hot stamping sand lack, lack of pen broken painting quality failure; on the contrary, the adhesive layer is easy to produce liquefaction, aluminum is easier to adhesion to the substrate, will produce hot stamping paste plate, the edge of the edge of the quality of the failure of the hairline. Generally speaking, the adhesive layer and the peeling layer should be matched to use.
The impact of paper surface properties
(1) dynamic, static friction coefficient: the indicator indirectly reflects the smoothness of the surface of the print, in general, too smooth surface is not conducive to hot stamping and adhesion.
(2) surface tension: the surface tension of the paper is generally measured with a dyne pen. Gravure printing with ordinary paper surface tension can generally meet the printing production requirements, non-absorbent substrate for UV printing, the requirements of the surface tension of 38dyn/cm or more is good. The surface tension of the product to be stamped is generally required to reach 36dyn/cm or more.
(3) Ink layer thickness: the thinner the ink layer at the stamping location, the easier it is to stamp and adhere.
(4) Base paper surface properties: non-absorbent paper (such as aluminized paper) than absorbent paper (such as coated paper, white cardboard, etc.) stamping India high.
(5) paper thermal conductivity: thermal conductivity of the paper is more difficult to hot stamping than the thermal conductivity of the paper is small.
(6) hot stamping position color ink dot percentage: field block more than plus mesh block (such as 50% of the plus mesh) is more difficult to hot stamping.
Stamping plate
(1) Material: commonly used hot stamping base plate has hard plastic sheet, soft film, metal sheet and paper class.
(2) Material hardness: the hardness of the plate is more favorable for stamping fine lines.
Shenzhen Gold Sun Color Printing Factory is a China based book manufacturer, very good at printing hardcover book, photo book, story book, photo album, Printing paper, coloring book, packaging & printing services, Labels, printing stickers, anti-water labels, vinyl label, custom label book , softcover book, custom book printing hardcover, mini book, photobook printing, hardcover book, , board books, color sticker books, sticker books, packaging boxes for small business, custom book, children board books, kids book, journals, notebooks, Agenda, Customs Calendar, magazines, color books, cookbooks, etc. With ISO-2001 and CE certificate, Gold Sun offers very good price and outstanding service.
Welcome contact us through admin@goldsunprinting.com or add whatsapp +86 13802583954. Thank you.
Email
008613802583954
whatsapp