1. Environmental protection

Environmentally friendly materials: Rotational molding lighting usually uses environmentally friendly plastic materials, such as PE (polyethylene). These materials do not produce pollution during the manufacturing process and have good sustainability. In addition, these materials can also be recycled and reused, in line with modern environmental protection concepts.

2. Aesthetics

Variety of options: The rotational molding process provides a wide range of options for lighting design, including a variety of colors and styles, which can be customized according to different decorative needs.

Smooth appearance: Rotomolded lighting has a smooth surface and high transparency, which can show unique light and shadow effects and become a beautiful landscape for indoor or outdoor decoration.

3. Durability

Anti-corrosion and collision resistance: Rotational molding products are anti-corrosion and collision-resistant, which means that rotational molding lighting can maintain good performance and extend service life in harsh environments.

Strong adaptability: The rotational molding process can produce lighting fixtures of various shapes and sizes to meet the decorative effects of different scenes and needs.

4. Practicality

Uniform light effect: The rotational molding lighting has uniform light effect and good light transmittance, which can create a comfortable and harmonious lighting environment.

Easy to clean: The surface of rotomolded lighting is smooth and not easy to adhere to dust. It is very convenient to clean. Just wipe it gently with a cloth.

5. Innovation

Large design space: The rotational molding process provides designers with a larger design space, and they can boldly turn their imagination into reality and create a variety of unique and novel lighting products.

1. Optimize cooling methods

Choose appropriate cooling intensity: Try to choose a method with low cooling intensity to avoid uneven shrinkage caused by too fast cooling rate. Although fan cooling is faster than room temperature cooling, it should be used with caution to avoid aggravating shrinkage and deformation.

Uniform cooling: During the cooling process, the rotation of the mold should be maintained to ensure that all parts of the product are cooled evenly. For products with large thickness differences, local air cooling or local reheating can be used to adjust the temperature difference to avoid large deformation.

2. Control the demoulding temperature

Extend the cooling time in the mold: A longer cooling time in the mold can reduce the shrinkage rate.

Control the demoulding temperature: On the premise of ensuring easy demoulding, the lower the demoulding temperature, the better, so as to minimize the risk of shrinkage and deformation.

3. Adjust process parameters

Adjust the rotation speed of the main and auxiliary shafts: Make the rotation speed ratio balanced and the rotation speed uniform, which will help the wall thickness of the molded products to be uniform, thereby reducing shrinkage and deformation.

Improve the heating process: Appropriately increasing the heating temperature can improve the density of the product and help reduce shrinkage and deformation during the cooling process.

4. Optimize mold design

Correct the mold structure: Correct the structures, narrow spaces, sharp angles, etc. in the mold that may cause shrinkage and deformation of the product to reduce the risk of deformation.

Keep the mold vents clear: If necessary, inert gas can be introduced into the mold to improve the temperature distribution and cooling effect inside the product.

As a common means of transportation, motorcycles need to store fuel during driving, so it is necessary to choose a suitable fuel storage device. In modern motorcycles, plastic fuel tanks are becoming more and more common. Why?

First of all, plastic fuel tanks are lighter and easier to manufacture than metal fuel tanks. Plastic materials have good toughness and impact resistance. While being wear-resistant and durable, they can also reduce the weight of the car body. This reduces the overall weight of the motorcycle and improves maneuverability and agility.

Secondly, plastic fuel tanks are more convenient to manufacture and maintain than metal fuel tanks. Making a plastic fuel tank is relatively simple and only requires injection molding, blow molding or extrusion molding. There is no excess waste produced during the production process and the cost is relatively low. In addition, plastic fuel tanks also have better leakage performance, getting rid of the common oil leakage problems of metal fuel tanks. At the same time, the plastic fuel tank design is more concise and fashionable, meeting the aesthetic needs of different consumers.

However, compared with metal fuel tanks, plastic fuel tanks also have some disadvantages. Plastic fuel tanks have a slightly shorter service life than metal tanks, and plastics are not as resistant to chemicals as metal tanks, so they may have an impact on the fuel. Moreover, plastic fuel tanks are prone to aging, being exposed to the sun, rain, and high temperatures. If left outdoors for a long time, they are prone to deformation, cracking, and other problems. Therefore, certain maintenance measures need to be taken during daily use.

1. Characteristics of rotational molding process

Seamless design: The rotational molding process evenly distributes the plastic material by rotating the mold to form a complete structure without seams. This integrated design greatly improves the leakage resistance of the water tank, which is especially important for floor scrubber water tanks that require a high degree of sealing.

Excellent corrosion resistance: Rotational molded water tanks usually use corrosion-resistant materials such as high-density polyethylene (HDPE), which can be used in acid and alkali environments for a long time and meet the operating needs of floor scrubbers in different environments.

High durability and impact resistance: The rotomolding process makes the wall thickness of the water tank uniform, with strong impact resistance and pressure resistance, and can withstand various impacts and pressures that the floor scrubber may encounter during use, thereby extending the life of the tank. The service life of the water tank.

High degree of customization: The rotational molding process can produce water tanks with complex shapes and various sizes to meet the needs of different floor washing machine models and specifications, and achieve personalized customization.

2. Specific requirements for floor washing machine water tanks

Sealing requirements: The water tank of the floor washing machine needs to have good sealing to prevent water from leaking during operation and affecting the cleaning effect and machine performance. The seamless design of the rotational molding process meets this need.

Durability requirements: The floor washing machine may encounter various complex environments and working conditions during use, such as uneven floors, impacts, etc., so the water tank needs to have good durability and impact resistance. The high durability and impact resistance of the rotomolding process allows the water tank to meet these challenges

1. Ingredients

2. Physical properties

3. Chemical properties

4. Processing characteristics

5. Application areas

1. The relationship between wall thickness and heating time

Directly affects heating efficiency: The thicker the wall thickness of the rotomolded product, it means that the larger the volume of material that needs to be heated inside the mold, so the longer it takes to reach the required sintering temperature. In contrast, products with thinner walls reach the sintered state more quickly, resulting in shorter heating times.

Heating efficiency and equipment performance: The length of heating time is also affected by the performance of the heating equipment. Efficient heating equipment can increase the internal temperature of the mold faster, thereby shortening the heating time. However, for products with a specific wall thickness, even if the equipment performance is high, it still takes a certain amount of time to ensure that the product is fully sintered.

2. Specific influencing factors

Raw material parameters: Different types of materials have different melting points and sintering characteristics, which will affect the heating time of raw materials. When using raw materials, it is necessary to fully consider the matching relationship between their sintering properties and the wall thickness of the product.

Mold design: The wall thickness of the mold and the heating method will also affect the heating time. For example, hot liquid conduction heating molds require thicker walls to ensure rapid heat transfer and uniform distribution; hot air circulation heating molds can appropriately thin the wall thickness to reduce heating time.

Whether rotomolded products can be applied to food grade mainly depends on the following factors:

Material Selection: A variety of thermoplastic materials can be used with the rotational molding process, but not all are suitable for food contact use. Food-grade rotational molding products must use plastic materials that meet food safety standards, such as polyethylene (PE, especially high-density polyethylene HDPE and low-density polyethylene LDPE), polypropylene (PP), etc. These materials have been extensively proven to be safe and non-toxic in food contact applications.

Production process control: During the rotational molding production process, process parameters such as temperature and time need to be strictly controlled to ensure that the plastic material is fully melted and evenly coated on the inner wall of the mold, while avoiding the generation of harmful substances. In addition, the production environment and equipment must also meet food production hygiene requirements.

Certification and compliance: Food-grade rotational molding products usually need to be tested and certified by relevant agencies, such as the US FDA (Food and Drug Administration), the European Union’s EU directives (such as 10/2011/EU on plastic materials and their products) regulations) etc. These certifications ensure that products meet food safety standards and regulatory requirements.

To sum up, rotational molding products can indeed be applied to food grade, but the prerequisite is that plastic materials that meet food safety standards must be selected, the production process must be strictly controlled, and the products must comply with relevant certification and regulatory requirements. In practical applications, many rotational molded products such as water tanks, storage tanks, food containers, etc. have been successfully used in the food industry.

Digital design and simulation: Using CAD (computer-aided design) and CAE (computer-aided engineering) software, you can accurately design molds and product shapes, and predict the molding process, stress distribution and performance of the product through simulation, reducing the number of mold trials.

Intelligent control system: Modern rotational molding production lines are equipped with advanced automation and intelligent control systems, including temperature control, rotation speed adjustment, heating time optimization, etc., to achieve precise control and improve the stability and consistency of the production process.

New materials and environmentally friendly technologies: With the increase in environmental awareness, rotational molding processes have begun to use more recyclable, biodegradable or low environmental impact plastic materials. In addition, we are also exploring the addition of reinforcing materials such as carbon fiber and metal fiber to plastics to improve the strength and durability of the product.

Combination of 3D printing and rotational molding: Although the rotational molding process itself does not directly involve 3D printing, the combination of the two technologies provides new ideas for the production of complex structural parts. For example, 3D printing technology is used to quickly produce complex mold prototypes or embedded parts, and then combined with the rotational molding process to produce final products, achieving personalized customization and rapid response to market demand.

Automation and robotics: In all aspects of rotational molding production, such as raw material feeding, mold loading and unloading, product removal and inspection, automated equipment and robots are introduced to reduce manual intervention and improve production efficiency and safety.

1. Rotational molding fishing boats

Rotational molding fishing boats are plastic fishing boats manufactured using the rotational molding process and have the following characteristics:

Material advantages: Using PE (plastic) material, it is light weight, good buoyancy and high safety performance.

Process characteristics: The rotational molding process allows the fishing boat to be molded in one go. It has the characteristics of acid and alkali resistance, corrosion resistance, wear resistance and fall resistance, and easy cleaning. It also has good air tightness and thermal insulation and refrigeration performance.

Usage scenarios: Widely used in aquaculture, fishing, tourism and other scenarios.

2. Rotational molded kayaks and pedal boats

Rotational molded kayaks and pedal boats are also commonly used rotomolded products when going out on the water. They have the following characteristics:

Versatility: Suitable for different water environments, both for leisure and entertainment, adventure and competitive competition.

Safety: The rotational molding process makes the product have good impact resistance and durability, and can remain safe in complex water environments.

Comfort: Some products are equipped with designs such as adjustable foot systems and anti-slip mats, which improve the comfort and convenience of use.

3. Rotational molded marine transport ships

For those who need greater load capacity and transportation capacity, rotomolded marine transport ships are a good choice. These transport ships are usually manufactured using the rotational molding process and have large cabin space and good carrying capacity, which can meet the needs of maritime material transportation.

4. Other rotomolded overseas products

1. Material properties

Thermal stability:

During the rotational molding process, the material needs to be heated at high temperatures for a long time, so it must have good thermal stability to prevent performance degradation.

Most rotational molding materials are stabilized with antioxidants to reduce the negative impact of prolonged heating on material properties.

Melt flowability:

The melt viscosity of the material must be low enough to impregnate the inner mold surfaces and melt into a homogeneous mass. This is usually measured by the melt flow rate (MFR). For commonly used rotational molding materials such as polyethylene, the MFR is generally between 2 and 8g/10min (2.16kg, at 190°C).

Impact strength:

Good impact strength is an important indicator for judging whether the material is suitable for low-temperature rotational molding products. Materials are usually required to maintain good impact resistance at temperatures as low as -40°C.

Environmental stress cracking resistance (ESCR):

The material should have the ability to withstand long-term contact with stress cracking media. It is generally believed that materials with ESCR values ​​exceeding 1000h are acceptable.

Flexural strength and tensile strength:

Depending on the material's final application requirements, materials need to be selected with sufficient bending and tensile strength. For example, engineering plastics such as nylon and polycarbonate have high strength.

Elongation at break:

The elongation at break of the material should be high to meet most application requirements.

2. Cost considerations

3. Application environment

4. Processing performance

5. Environmental protection and sustainability

The fire protection grade of rotational molded products is divided according to the combustion performance of the material. This standard is usually set by national standards or industry standards. At present, the more common fire protection rating classification system is based on the UL94 standard, which divides the fire protection rating into multiple levels. Among them, the three levels related to rotational molding products are mainly V-0, V-1, and V-2. These The grade reflects the material's burning and extinguishing characteristics in a flame.

Detailed explanation of fire protection grade of rotational molding products

V-0 level:

Definition: V-0 is the highest level of fire protection, which means that under a vertical burning test, the material’s burning time does not exceed 10 seconds, and the self-ignition extinction time does not exceed 30 seconds. At the same time, there will be no burning objects during the entire test. fall.

V-1 level:

Definition: The fire resistance of V-1 grade is slightly lower than V-0, but after the vertical burning test, even if the flame is extinguished, no burning matter is allowed to drip.

Application scenarios: V-1 grade rotational molding products are suitable for areas that have certain requirements for fire resistance but do not need to meet the strict standards of V-0 grade, such as office furniture.

V-2 level:

Definition: The V-2 level is the lowest of the three levels. It requires that the flame of the sample extinguishes itself within 60 seconds after two 10-second burning tests, but burning materials are allowed to drip.

Application scenarios: V-2 grade rotational molding products are suitable for occasions that have certain requirements for fire resistance but do not require high standards, such as building interiors, household appliances, etc.

1. Electric heating

2. Hot air circulation heating

3. Gas heating

4. Far infrared heating

5. Oil heating