The evolving packaging industry is characterized by frequent innovations that adapt to changes in the economy, new technologies and user preferences. Some very significant changes are related to the use of raw papers to improve their performance in competitive markets. Hot wax processing is clearly part of this type of improved performance.
Hot wax processing involves the thermal application of materials (mainly petroleum derivative waxes) to various cellulosic substrates in various ways. The main use of hot wax processing is to process corrugated cardboard, folding cartons, paper cups, and cup-shaped containers to improve their performance.
This chapter discusses how wax formulations are formulated and applied to a variety of base papers to meet the stiffness, wet strength, appearance, gloss, abrasion resistance, ease of processing in high-speed production facilities, and the blocking of steam, odor, and aroma transmission. The term "hot wax treatment" as used herein refers to the application of 100% solid wax in a molten state at 90-200 ° C, and returns to the solid state after cooling. It imparts unique aesthetic and/or functional properties to the finished product.
Before 1950, most fruits, vegetables, meat, fish and poultry were transported in wooden crates of bundled wire. Absolutely, corrugated transport boxes until the existence of Pridham containers (a type of carton) in 1914, for the vested interests, even the use of non-wood containers for the sale of ordinary goods is very rare. This situation enabled the Intercontinental Commercial Council to issue an order of “interruption and prohibition” to the railway, effectively suppressing discrimination against fiber cartons by exchanging goods taxes only on goods transported in wooden boxes or iron boxes.
Since the carton has functional and economic benefits, there has been an unusual increase in the use of cartons since then. The number of cartons has increased tenfold each year in a decade, totaling more than one billion.
Despite this, the frozen fruits and vegetables, fish and poultry, which were bundled with steel wire, were still common in 1950. Cartons are not suitable for such tasks because they cannot withstand the effects of water and moisture on frozen products. In about 1958, the ability to improve the wet strength with waxed corrugated boxes was confirmed in the laboratory and on the field. With the advancement of improved cartons, wax blends and application techniques, elaborately processed cartons with wax mixtures have quickly captured the frozen product transport market as previously shipped dry goods. Waxed corrugated boxes began to be used to transport California sweet potatoes in 1959. They immediately replaced the old wooden boxes that were used and began to use waxed corrugated boxes for transporting other products. Today, billions of dollars have been used every year.
The cardboard boxes are rarely seen in the wooden boxes with bundles of wire.
Click here to view Previous or Next