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Standard Test Methods for Measuring Adhesion by Tape Test
This standard is issued under the fixed designation D 3359; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval. 1. Scope 1.1 These test methods cover procedures for assessing the adhesion of coating films to metallic substrates by applying and removing pressure-sensitive tapeRead More …
Low Temperature Cure Powder Coatings is developed to heat-sensitive substrates
For application on heat-sensitive substrates like MDF, the powder must cure below 302°F (150°C) or even 212°F (100°C). Several approaches have been developed to achieve this goal, ranging from low-temperature-cure conventional chemistries to radiation-curable evolving chemistries. A vast number of published articles and patents have confirmed the ability of UV-curable technologies to produce glossy, smooth coatings on MDF within three to five minutes of process time.8The main advantages of UV-cured powders include higher productivity and space savings due to shorterRead More …
Adhesion On Wood And Intercoat Adhesion for wood coating
Since the early 1970s when radiation-curing technology started to develop, mainly in the field of printing ink, the technology has known considerable success. One of the most successful areas has been wood coating, specifically the furniture and parquet flooring industries As with conventional coatings, it is necessary in radiation-curing systems to apply several layers of coating to get a satisfactory finish. Consequently, in addition to considering adhesion on wood, intercoat adhesion and substrate preparation must be considered. Sanding of theRead More …
Comparison between Ultra-low bake and ultraviolet
Ultra-low bake (ULB) and ultraviolet (UV) Which is Better? The choice of whether to use UV or ULB powders primarily depends on the requirements of the application. Generally, ULB powders are recommended for lower-performance end uses (e.g., TV stands shelves, etc.) as they meet the furniture standards for “general use.” Also, compared to UV powder coatings, ULB powders offer a broader color range and a lower cost per square foot coated. Some colors, such as deep yellows, are difficult toRead More …
Dramatic development for uv powder coating on MDF
Substrates such as wood, plastics and medium density fiberboard (MDF) are sensitive to heat (thermal expansion) and cannot be coated with conventional powder coatings. Consequently liquid coatings, foils and laminates have been used for their decoration and protection, especially in the furniture industry. In recent years, the development of ultra-low bake (ULB) and ultraviolet (UV) powder coatings for these substrates has allowed a dramatic reduction or even elimination of these traditional systems, resulting in new benefits for manufacturers. The woodworkingRead More …
Spraying process of UV powder coating
The powders can be sprayed on most MDF types using conventional corona or tribo charging guns. In the latter case, the addition of a tribo additive to the formulation is recommended. Applied layer thickness is between 35 and 100 um, depending on the type of application. Pre-heating of the board can aid powder application in some cases. Heating To melt the applied powder efficiently, medium wave infrared radiation (IRM) is used. Further flow out is achieved by using a combinationRead More …
Benefits of UV Powder Coating on Wood
UV powder coating technology offers a fast, clean and economic attractive method to achieve high-quality finishes on wood-based substrates. The coating process consists of the following steps: First the article is hung or placed onto a conveyor belt and the powder is sprayed electrostatically onto the object. Then the coated object enters the oven (temperatures of 90-140 degC are sufficient) where the powder melts and flows together to form a film. This step takes 30-150 seconds, depending on the desiredRead More …
Drawbacks with liquid coating and overlays on MDF finishing
The two most widely used finishing techniques for MDF boards are: Liquid coatings Paper-based laminates (mostly melamine impregnated) and Thermoplastic foils (PVC, ABS, polyolefine-based) A range of surface appearances and qualities can be obtained with these technologies. However, there can be some drawbacks with both liquid coating systems and overlays, which can be overcome by use of UV powder coating. When using liquid coatings, normally a multi-coat system with interlayer sanding is required to achieve attractive finishes. This means thatRead More …
Binder and Crosslinkers for UV Powder Coatings
The most suitable approach for a coating formulation is the use of a major binder and a crosslinker. The cross¬linker may control the network density for the coating, while the binder determines properties of the coating such as discoloration, outdoor stability, mechanical properties, etc. Furthermore, this approach will lead to a more homogenous concept in the powder coating applications as a category bringing similitude to thermosetting coatings where crosslinkers such as TGIC and hydroxyl amides are used. A crosslinker shouldRead More …
New benefits due to the combined technology of UV and powder coating
The latest development in powder coatings is the combination of powder coating technology and UV technology. This approach shows some very important benefits. The benefits due to powder coating technology versus liquid coatings are: Elimination or reduction of intermediate sanding steps; High performance at high utilization rate, reclaim leading to 95% powder usage; No VOC during the curing process; and Easy recycling and no waste treatment. New benefits due to the combined technology of UV and powder coating are: SplitRead More …
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