1, the preface
Transfer wood grain decorative aluminum boom has nearly ten years in our country, it is because of wood grain aluminum has a variety of imitation wood grain color pattern got the favour of people, ecological effect in aluminum transfer wood grain, widely used in all kinds of high-grade building decoration, as well as the hotel indoor bathroom door furniture etc.
There are two ways of processing wood grain on aluminum profile surface: one is thermal transfer printing technology, characterized by clear realistic wood grain patterns, which can transfer a variety of color patterns; The other is vertical spraying scanning technology, the wood grain effect concave-convex three-dimensional sense is strong, but the wood grain design abstract, single, fidelity is enough.
2. Formation mechanism of wood grain
The formation mechanism of wood grain is the transfer penetration of wood ink. In the process of curing, printing film on aluminum vacuum is formed on the surface coating, printing ink attachment on the coating, with the increase of baking temperature, medium dissolve volatile solvent, coating thermal molecular motion increases, infiltration, ink molecules by coating clearance together most of the printing ink coating, show the original wood color.
3, wood print transfer
According to the different types of aluminum profile surface coating, it is related to the performance of wood grain conversion film. At present, most wood grain transfer printing adopts spray powder transfer wood grain printing process, the process flow is as follows: aluminum pretreatment → spray base color powder curing → coating wood grain transfer film → curing transfer → paper removal.
Powder spraying process adopts electrostatic spraying, the powder used is special wood grain powder, after curing coating film thickness to ensure the transfer of wood ink penetration depth.
Wood grain transfer printing method has gone through three stages of development, there are the following three coated technology:
3.1 use glue to paste transfer paper
Earliest stage most of the wood grain transfer printing is to use glue to paste transfer paper, cut better according to aluminum shape size print paper, wood grain side with glue will transfer printing paper transfer printing aluminum decoration face stick, useful manual brushing glue, stickers of the manual operation mode, use the universal wheel laminating machine brush glue stickers, mechanical operation, using thermal transfer glue is designed to make wood grain paper can be transfer to aluminum decorative surface. After the paper is pasted with tape at both ends of the profile, will have been pasted on the paper of the spray aluminum sent to the oven curing, baking temperature the length of time according to the transferred aluminum shape, to transfer wood grain texture depth other comprehensive factors to make appropriate adjustments, usually transfer curing temperature of 180℃, time for 10 minutes. Remove the transferred aluminum the oven, tear off the heat transfer paper, do surface cleaning. At present this kind of backward laminating technology equipment have been basically eliminated.
3.2 using transfer paper plastic bag vacuum method
At the present stage, part of the transfer of wood printing method is to use wood paper to transfer the aluminum wrapped, with high temperature resistant adhesive paper to adhere to the paper's boundary, to prevent the release of wood paper. Position live on have aluminum coated wood grain paper high temperature resistance impermeability good plastic bag, then the two ends of the plastic bag, vacuum plastic bag close to aluminum, through negative pressure has pressed aluminum plastic bag compression can also be clingy on aluminum, wood grain paper vacuum negative pressure size according to the shape of the transfer printing aluminum plastic bag have negative pressure factors such as they can afford to do the appropriate adjustment. Will have wrapped aluminum sent to the oven curing, baking temperature the length of time according to the transferred aluminum shape, to transfer wood grain texture depth other comprehensive factors to make appropriate adjustments, usually transfer curing temperature of 180℃, time for 15 minutes. Roll out the transferred aluminum the oven, pull out the plastic bag one end of the aluminum, the plastic bag can be reused, finally tear off the heat transfer wood paper, do surface cleaning.
3.3 PE wood grain transfer film vacuum method
At present, most wood grain transfer printing is the use of PE heat transfer wood grain film to transfer aluminum through the automatic packaging machine sealed into tubular bagging. Vacuum both ends of the tubular PE transfer film bag until the PE transfer film is fully attached to the aluminum. Vacuum negative pressure size according to the shape of transferred aluminum PE transfer film can withstand the negative pressure to make appropriate adjustments. The vacuum has been pumped aluminum sent to the oven curing, baking temperature time according to the transfer of aluminum shape, to transfer the depth of wood grain texture other comprehensive factors to make appropriate adjustments, usually transfer the temperature of 180℃, 15 minutes. the oven has been transferred to the printing of aluminum, with the automatic blowing method of PE transfer film bagging blown, after cooling off the residual PE transfer film. PE wood grain transfer film vacuum way to transfer all kinds of wood grain, the transfer of wood grain pattern clear, strong sense of layers, wood ink penetration into the aluminum film, so as to protect light weather resistance.