In 1855 R. Peters of Britain documented the first use of biaxial rotation and heat. This rotational molding process was used to create metal artillery shells and other hollow vessels. The main purpose of using rotational molding was to create consistency in wall thickness and density. In 1905 in the United States F.A. Voelke used this method for the hollowing of wax objects. This led to G.S. Baker’s and G.W. Perks’s process of making hollow chocolate eggs in 1910.
Rotational molding developed further and R.J. Powell used this process for molding plaster of Paris in the 1920’s. These early methods using different materials directed the advancements in the way rotational molding is used today with plastics.
Plastics were introduced to the rotational molding process in the early 1950s. One of the first applications was to manufacture doll heads. The machinery was made of an E Blue box-oven machine, inspired by a General Motors rear axle, powered by an external electric motor and heated by floor-mounted gas burners. The mold was made out of electroformed nickel-copper, and the plastic was a liquid PVC plastisol,
The cooling method consisted of placing the mold into cold water. This process of rotational molding led to the creation of other plastic toys. As demand and popularity of this process increased, it was used to create other products such as road cones, marine buoys, and car armrests. This popularity led to the development of larger machinery. A new system of heating was also created, going from the original direct gas jets to the current indirect high velocity air system.
In Europe during the 1960s the Engel process was developed. This allowed the creation of large hollow containers to be created in low-density polyethylene. The cooling method consisted of turning off the burners and allowing the plastic to harden while still rocking in the mold.
In 1976, the Association of Rotational Moulders (ARM) was started in Chicago as a worldwide trade association. The main objective of this association is to increase awareness of the rotational molding technology and process.
In the 1980s, new plastics, (polycarbonate, polyester, nylon, etc…) were introduced to rotational molding. This has led to new uses for this process, such as the creation of fuel tanks and industrial moldings. The research that has been done since the 1980s at Queen’s University has led to the development of more precise monitoring and control of the cooling processes based on their development of the “Rotolog system”.
It was interesting to know that the rotational molding process in the early 1950s uses plastics, and one of the first products was doll heads. This is a great tip for those who are in the manufacturing industry and work on plastic items such as bottles of hygienic items. I could imagine how the plastic rotational molding process could provide faster productivity and accuracy.
rotational molding is a very good molding method
Rotational molding is very popular in our local molding industry
Most mould designers have realized that Mould knowledge is very important
this article is worth reading,Because it contains a lot of useful information
that is what I need, rotational molding can improve the efficiency of molding
rotational molding is one of injection molding method, it is often used in our mold industry
rotational molding is an important molding method
rotational molding will improve our production efficiency
rotational molding is often used in our molding industry
rotational molding is a popular molding method
this blog is very valuable
thanks for your introduction, I learned new knowledge
thank you so much! that is really what I need, I am a mold engineer.
That kind of molding method can improve the production efficiency a lot. thanks for sharing
Woah! I’m really loving the template/theme
of this blog. It’s simple, yet effective. A lot
of times it’s difficult to get that “perfect balance” between user friendliness
and appearance. I must say that you’ve done a great job with this.
In addition, the blog loads extremely quick for me on Opera.
Outstanding Blog!
I was recommended this blog by my cousin. I am now not sure whether or not this post is written by him as nobody else understand such precise
approximately my difficulty. You are incredible! Thanks!