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
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
2024
10
09
1. Ingredients
2. Physical properties
3. Chemical properties
4. Processing characteristics
5. Application areas
2. Physical properties
3. Chemical properties
4. Processing characteristics
5. Application areas
2024
10
08
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.
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.
2024
10
06
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.
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.
2024
10
05
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.
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.
2024
09
23
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
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
2024
09
21
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
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
2024
09
20
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.
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.
2024
09
19
1. Electric heating
2. Hot air circulation heating
3. Gas heating
4. Far infrared heating
5. Oil heating
2. Hot air circulation heating
3. Gas heating
4. Far infrared heating
5. Oil heating
2024
09
18
This blessing from Foshan Nanhai Boguan Plastic Products Co., Ltd. is very warm! In this Mid-Autumn Festival of reunion and beauty, may all your wishes come true like the full moon. The Mid-Autumn Festival is not only a time to taste mooncakes and enjoy the bright moon together, but also a warm time for family reunions, friends gatherings and sharing happiness. I hope that every employee, partner of Foshan Nanhai Boguan Plastic Products Co., Ltd., and all friends who care about and support the company's development can gain full happiness and joy, have a harmonious family, and have a successful career during this Mid-Autumn Festival. Good health and all the best! Happy Mid-Autumn Festival!
2024
09
16
1. Life span of rotomolded products for outdoor use
The service life of rotomolded products used outdoors is affected by many factors, including but not limited to material type, light intensity, oxidation degree, usage environment, and maintenance conditions. Generally speaking, due to their good weather resistance and anti-aging capabilities, rotational molded products can have a long service life in outdoor environments, usually around 5-10 years. However, this time range is not absolute and needs to be comprehensively considered based on factors such as product material, design, and usage conditions.
2. Characteristics of anti-UV materials
Anti-UV materials refer to materials that have the ability to resist ultraviolet radiation. This material can maintain good performance and appearance stability in outdoor environments. The characteristics of rotational molding anti-UV materials mainly include the following aspects:
Excellent anti-UV performance: Anti-UV materials can effectively absorb or reflect ultraviolet radiation, reducing ultraviolet damage to materials, thereby extending the service life of the product.
Good weather resistance: In addition to anti-UV properties, anti-UV materials usually have good anti-oxidation and anti-aging capabilities, and can maintain stable performance and appearance in outdoor environments for a long time.
Wide range of applications: Because anti-UV materials have the above-mentioned excellent properties, they are widely used in outdoor furniture, awnings, billboards, toys and other products that require long-term exposure to sunlight.
The service life of rotomolded products used outdoors is affected by many factors, including but not limited to material type, light intensity, oxidation degree, usage environment, and maintenance conditions. Generally speaking, due to their good weather resistance and anti-aging capabilities, rotational molded products can have a long service life in outdoor environments, usually around 5-10 years. However, this time range is not absolute and needs to be comprehensively considered based on factors such as product material, design, and usage conditions.
2. Characteristics of anti-UV materials
Anti-UV materials refer to materials that have the ability to resist ultraviolet radiation. This material can maintain good performance and appearance stability in outdoor environments. The characteristics of rotational molding anti-UV materials mainly include the following aspects:
Excellent anti-UV performance: Anti-UV materials can effectively absorb or reflect ultraviolet radiation, reducing ultraviolet damage to materials, thereby extending the service life of the product.
Good weather resistance: In addition to anti-UV properties, anti-UV materials usually have good anti-oxidation and anti-aging capabilities, and can maintain stable performance and appearance in outdoor environments for a long time.
Wide range of applications: Because anti-UV materials have the above-mentioned excellent properties, they are widely used in outdoor furniture, awnings, billboards, toys and other products that require long-term exposure to sunlight.
2024
09
14
When maintaining rotational molding molds, you should pay attention to the following key details to ensure the long-term performance of the mold and product quality:
1. Daily observation and inspection
Regular inspection: Regularly observe the surface condition of the rotational mold and check for signs of scratches, dents, peeling, cracks, etc. Once small bad spots are found on the surface of the mold cavity, they should be repaired in time to prevent the problem from expanding.
Detailed inspection: Check whether there is excess waste accumulated around the flange of the mold, and clean it up in time to ensure the sealing of the mold. Avoid using rigid tools such as steel knives when cleaning to avoid damaging the parting surface of the flange.
2. Correct use and operation
Avoid rough operations: When sticking the product to the mold, do not use hard objects such as sticks to pry, especially iron rods, to avoid damaging the mold. For Teflon-coated molds, once a small piece peels off, the entire mold needs to be shoveled off and re-sprayed, causing unnecessary trouble and delay. Flexible and soft demoulding methods should be used.
Mold closing and opening: When closing the rotomolding tooling mold, the upper and lower molds must not be misaligned or scratched. When opening the mold to take out the product, you must also operate gently to avoid brutal behavior.
Correct installation: When installing the mold on the machine, check the fixing screws twice to ensure that the mold is stable and does not fall off.
3. Environment and storage
Dry and ventilated: The mold should be placed in a dry and ventilated place to prevent water vapor from entering and affecting production and product quality. At the same time, the place where it is placed should be flat and well-loaded. Check the mold frame for cracks and damage. The mold should be reset and installed to avoid deformation due to its own weight.
1. Daily observation and inspection
Regular inspection: Regularly observe the surface condition of the rotational mold and check for signs of scratches, dents, peeling, cracks, etc. Once small bad spots are found on the surface of the mold cavity, they should be repaired in time to prevent the problem from expanding.
Detailed inspection: Check whether there is excess waste accumulated around the flange of the mold, and clean it up in time to ensure the sealing of the mold. Avoid using rigid tools such as steel knives when cleaning to avoid damaging the parting surface of the flange.
2. Correct use and operation
Avoid rough operations: When sticking the product to the mold, do not use hard objects such as sticks to pry, especially iron rods, to avoid damaging the mold. For Teflon-coated molds, once a small piece peels off, the entire mold needs to be shoveled off and re-sprayed, causing unnecessary trouble and delay. Flexible and soft demoulding methods should be used.
Mold closing and opening: When closing the rotomolding tooling mold, the upper and lower molds must not be misaligned or scratched. When opening the mold to take out the product, you must also operate gently to avoid brutal behavior.
Correct installation: When installing the mold on the machine, check the fixing screws twice to ensure that the mold is stable and does not fall off.
3. Environment and storage
Dry and ventilated: The mold should be placed in a dry and ventilated place to prevent water vapor from entering and affecting production and product quality. At the same time, the place where it is placed should be flat and well-loaded. Check the mold frame for cracks and damage. The mold should be reset and installed to avoid deformation due to its own weight.
2024
09
12
no data
recommended for you
no data
Ready to work with us ？
Quick Links
Contact Us