Slot Die Coating is a high-precision coating method that is not only used for coating rolled substrates such as electronic components (FPC, RCC, CSP, LOC, etc.), optical films (brightening film, hardcoat, polarizing film, diffusion film, etc.), battery plates, etc., but also for non continuous substrates such as LCD glass substrate photoresist coating. The operating principle is to pump a certain amount of fluid into a mold that can evenly spread the fluid.
The narrow slit coating die can produce very thin coatings and transparent optical coatings, while maintaining the coating amount within a very precise tolerance range. Unlike the coating system that wipes the coating liquid onto the substrate, our narrow slit coating die belongs to the coating die with relatively large lip gaps (up to 0.0762mm), and the liquid sucked out by the lip gaps can form a coating as thin as 1 μ m. The narrow gap coating die can control the coating amount over the entire width within a range of 2 μ m when the coating thickness is only 2 μ m; Within a tolerance range of approximately 2.5%. The slit coating die head lip we produce is fixed, so interchangeable gap control plates can be used to change the thickness and width of the coating. The coating thickness ranges from less than 1 μ m to 254 μ m. This type of mold can process various types of adhesives (including special transparent adhesives), such as batteries, ceramic capacitors, decorative surfaces, electronic display media, filter membranes, flooring, fuel cells, magnetic slurries, medical products, photoresist materials, pressure-sensitive tapes, solar cells, superconductors, tear tapes, and window films.
The lip of the mold head is fixed, and the gap between the lip is adjusted using shims. This type of die does not "apply" the coating material flow to the substrate like an adjustable die. It adheres to the substrate by sucking the material flow out of the relatively large die lip gap. This wet coating can be as thin as 2 μ m. Based on this wet coating process, the die system is particularly suitable for ultra-thin or transparent coatings.
Currently, many coating manufacturers use both roller and seam die coating processes simultaneously. Roller coating is a traditional process that indirectly controls the amount of material applied to the substrate through a scraper or pre-set roller gap; Excess coating material is scraped off and sent back to the coating tank; The coating groove itself is open in the workshop. Compared to it, the sewing die head is very different. Firstly, it is a closed system, and secondly, it pre measures the coating material through a precision metering pump. Based on these two points, the seam die has some advantages that roller coating does not have:
The coating weight and overall distribution are more uniform;
● Faster production line speed; Greatly reduces volatile emissions, coating pollution, raw material waste, and workplace chaos.
Our slit coating die has a coating width of up to 3m and a wet coating thickness ranging from 2 μ m to 254 μ m. The slit coating die is generally provided as part of a complete system, which includes a locator (to maintain precise orientation with the support roller), a vacuum box (to remove air carried by the coating material flow from leaving the die to contacting the substrate surface), and material flow conveying equipment (filters, pumps, drive devices, and air compressors). As an option, a mold head operation mechanism called a "hinge" can be added to the locator to enable the operator to quickly disassemble and clean the mold head, replace shims if necessary, and re tighten the mold body.
Business hotline: 13922900580
Email: tongmeng@tong-meng.com
Address: Factory Building No. 12, 2nd Road, Wentang Ci Xia Industrial Zone, Dongcheng Street, Dongguan City, Guangdong Province
