The classification of equipment for hot wax processing is not so clear. Some equipment (such as a immersion waxer for full impregnation saturation) is made on site by the skilled person according to general principles. Any two devices are not necessarily the same. Other types (such as curtain coaters) vary in design and handling properties depending on whether they are treated webs or corrugated boxboard. Roller coaters use many differently functioning rolls to heat the wax. Apply to corrugated cardboard, corrugated components and folding cartons. A slotted die coater applies the wax directly to the web to avoid some of the contamination caused by the upper coating roll.
This section will focus on the general principles of the various applicator structures and operations. If you want to get a different effect or product, you need to make some changes.
Dipping wax for many years is a common practice for full impregnation of corrugated board blanks. This method is still in use. The immersion waxer includes a large tank containing molten wax at a temperature of about 100-135 ° C. The slot and the printed corrugated blank have been engraved into a bundle. The paper bundle is immersed vertically in the molten wax for a short period of time (within minutes), depending on the base paper and wax formulation. Remove the bundle of paper from the tank and leaching (corrugating vertically) in a warm environment to remove excess wax from the bundle. The paper is then placed on a flat sheet and typically cooled prior to being delivered to the user. The production volume is usually thousands of cardboard per hour. Fully immersed in a saturated carton containing approximately 40%^50% wax (subject to the original unstorched carton).
The operator does not have much control over the amount of waxing, since the amount of waxing is mainly determined by the ability of the board to accept the wax. Change the wax ratio or immersion time and temperature. The effect is not great. Good leaching is important in the impregnation process. If the carton blanks of the bundle are easily separated, a very small amount of molten wax will remain outside after leaching. This excess (or abnormal) wax will stick the blank together when cured. Make
Paper bundles are like "bricks." Such agglomerates typically cause trouble when the temperature is about 10 ° C below the melting point of the wax.
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