Rotoun Patents | How Can Rotomolded Playground Components Purify Air?

The Rotoun Patents column continues to interpret authorized invention patents from Rotoun Plastic Group. In our previous article, we covered formula technology for wear‑resistant and high‑temperature‑resistant plastic‑lined pipes. This time we turn to rotomolded playground facilities and introduce an invention patent integrating air‑purification functions directly into rotomolded play components.

Patent Title: Air‑Purifiable Rotomolded Playground Component and Its Preparation Method

Patent No.: ZL 2019 1 0924277.6

Rotomolded play components are widely adopted in kindergartens, early‑education centres and indoor family entertainment centres for their safe rounded edges, excellent impact resistance and good weather resistance. The industry has previously attempted to apply tourmaline into play articles to generate negative ions for air purification. However, conventional solutions carry obvious drawbacks:

▫️ Limited negative‑ion output: Simple addition of raw tourmaline powder delivers low negative‑ion yield with negligible air‑purifying effect.

▫️ Deteriorated mechanical performance: Direct blending of tourmaline powder into plastic matrix damages material structure, reducing toughness and impact strength and failing playground safety standards.

▫️ External purification equipment: Stand‑alone air purifiers occupy valuable play space, face high risk of physical damage and require continuous maintenance.

▫️ Post‑applied purification coating: Coatings sprayed onto finished rotomolded surfaces easily peel off due to frequent children’s contact, friction and sunlight ageing, leading to rapid loss of purification performance.

▫️ Safety concerns: Products are frequently touched by children. Added functional materials must strictly comply with toy and playground safety standards without introducing hazardous substances.

Targeting these industry bottlenecks, Rotoun Plastic Group’s R&D team modified and compounded tourmaline powder and matched it with anti‑static PE matrix, developing this air‑purifying rotomolded play component, which has obtained national invention‑patent authorization.Core Technical Highlights of This PatentModified tourmaline composite for higher negative‑ion release. Tourmaline powder is encapsulated within EVA resin to produce functional powder, improving powder dispersion and greatly boosting negative‑ion output for better air‑purification performance.

✅ Preserved mechanical properties to meet playground safety standards. Modified tourmaline composite does not compromise the strength of PE matrix. While realizing air‑purifying functions, the rotomolded material retains excellent impact resistance without downgrading mechanical performance of finished products.

✅ Intrinsically anti‑static base material. Anti‑static PE powder is adopted as matrix to reduce dust attraction from static electricity, keep play components clean and support stable long‑term negative‑ion release.

✅ Embedded functional ingredients instead of surface coating. Purifying components are incorporated directly into rotomolding raw materials. Purification function will not fail caused by friction, touching or UV exposure, delivering durable and stable performance.

✅ Based on mature rotomolding process. Suitable for complex‑shape play articles such as slides, safety barriers and large building blocks. Good production compatibility, no large‑scale production‑line reconstruction required for industrialized manufacturing.

✅ Dual‑purpose product for space saving. Playground components themselves act as purification carriers, eliminating extra space occupied by standalone purification devices.Practical Application ScenariosScenario 1: Indoor and outdoor playground facilities for kindergartens

Children gather for long hours in kindergarten indoor play zones and outdoor playgrounds. This material can be made into rotomolded slide parts, safety barriers and large‑size building blocks. While guaranteeing play safety, it helps improve local air quality by releasing negative ions.

Scenario 2: Early‑education centres and indoor family entertainment parks

Most indoor play venues are relatively enclosed with high visitor turnover. Large‑area rotomolded play modules serve as built‑in purification carriers and save floor space otherwise taken by extra air‑treatment equipment.

Scenario 3: Children’s exhibition halls and cultural‑tourism mini play installations

Semi‑open play devices in cultural venues and children’s science museums benefit from good anti‑ageing performance of the material. Tourmaline‑based functional components can steadily release negative‑ions under outdoor or semi‑indoor conditions.Core Values This Patent Brings to Customers

🔹 Product differentiation advantage. Adds negative‑ion air‑purification feature to highly‑homogenized rotomolded playground market and strengthens product competitiveness.

🔹 Long‑lasting and stable purification performance. Functions are embedded inside base material rather than surface coating; purification capability remains effective throughout the whole product service life without coating peeling risks.

🔹 No compromise on mechanical properties. Solves the long‑standing problem of strength loss caused by traditional tourmaline formulas. Finished articles meet impact‑resistance requirements for children‑contact applications.

🔹 Lower venue supporting costs. Built‑in air‑purification function reduces procurement and maintenance expenditure for additional on‑site air purifiers.

🔹 High design flexibility. Leverages advantages of rotomolding technology to realise various complex‑shaped play components and satisfy diversified scenario‑based design requirements.

This patent expands the functional boundary of rotomolding materials and reflects Rotoun’s continuous commitment to functional rotomolded product development. Guided by real‑world application scenarios, Rotoun integrates functional innovation into rotomolding base materials, overcomes performance limitations of tourmaline applied in children’s play articles. Rotomolded products are no longer limited to shape‑based functions but also help create healthier surroundings.

The Rotoun Patents column will keep updating. Stay tuned for our next interpretation of Rotoun’s self‑developed patents.

What practical experience or challenges have you encountered in developing functional rotomolded products or selecting playground‑grade rotomolding materials? Feel free to leave your comments and join the discussion.