China Plastic Synergy Group is a rotational molding company in China, has handled hundreds of rotational molding manufacturing projects for clients. We focus on execution and quality assurance, and are always customer-centered, process driven, and enthusiastic about China Plastic rotational molding Manufacturing.
We are your Ideal Partner in Plastic rotational molding Manufacturing. With more than 18 years of experience in the industry. Our creative team of engineers takes care of every detail to make sure you get the highest quality parts at low cost. It all starts with filling out our Request for Quote form. We take every step possible to ensure the lowest price with the highest quality. You’ll receive your quote quickly, allowing you to make the most of your time.
What is Rotational Molding?
Rotational molding, also known as rotomolding, is a plastics molding technology which is ideal for making hollow articles. It is a casting technic but unlike most other plastics processes there is no pressure involved. Molds for the process are relatively inexpensive as they do not have to withstand pressure and therefore relatively short production runs can be made very economically.
Rotomolding is used to make a very diverse range of products. The process offers the product designer exceptional freedom as just about any shape can be produced. There is almost no limit to the size of moldings and there are literally thousands of applications.
Materials Used in Rotational Molding
The commonly used polymers in rotational molding are presented below. Most polymers used for this process are thermoplastics.
Polyethylene: Polyethylene accounts for more than 80% of the polymers used in industries that use rotational molding. This is due to its low cost and ease of molding. It is readily available in powdered form, unlike non-polyethylene polymers, which are difficult to grind. It also has good chemical resistance and low water absorption.
Polyethylene grades that can be used in rotational are High-Density Polyethylene (HDPE), Low-Density Polyethylene (LDPE), Medium-Density Polyethylene (MDPE), and Linear Low-Density Polyethylene (LLDPE).
Polypropylene: Polypropylene is the second-most processed plastic and is one of the most versatile polymers available. It has characteristics between LDPE and HDPE. Its valued properties are good chemical, heat, and fatigue resistance.
Polyvinyl Chloride: Polyvinyl chloride is the polymer form of vinyl chloride monomer. It is a strong and rigid plastic and is compatible with many additives to modify its mechanical properties.
Nylon: Nylon comes from the polyamide plastic group. Aside from film and fiber production, this polymer can be used as a molding compound. It is generally tough, with good thermal and chemical resistance.
Rotomolding has several unique characteristics and advantages compared to other molding processes.
- Low tooling costs. As this is a casting process there is no pressure. This means molds are inexpensive and low volume can be economic. If you have a great idea for a new product but don’t know how many you’ll sell or simply want a low volume production run, rotomolding’s low initial investment makes it particularly attractive.
- It’s easy to make complicated shapes. Rotomolding readily accommodates production complexities such as stiffening ribs, molded inserts and different surface textures.
- Uniform wall thickness. Rotomolding achieves consistent wall thickness with corners tending to be thicker. This increases product strength and integrity. Other processes such as blow molding stretch the molten material at corners or sharp edges creating potential thin spots and weaknesses.
- Rotational molding machine costs are low compared to other processes and the investment required is small. There is great production flexibility with the process.
- There is almost no limit to the size of products and several different products can be molded at the same time.
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