In the production process of rotational molded products, the control of cooling speed is a very important link, which directly affects the quality and production efficiency of the product.

Let's discuss how to control the cooling rate.

1. The cooling rate should be determined according to the type and shape of the material.

Different materials have different temperature change curves during cooling, so the cooling rate needs to be adjusted according to the specific situation.

Generally speaking, for thick-walled products, a slower cooling rate is required to avoid stress inside the product that may lead to deformation and cracks;

For thin-walled products, the cooling rate can be appropriately increased to improve production efficiency.

2. Control the temperature and flow rate of the cooling medium.

The temperature and flow rate of the cooling medium directly affect the cooling rate of the product surface.

Generally speaking, the cooling rate can be controlled by adjusting the temperature and flow rate of cooling water or air.

It should be noted that the temperature and flow rate of the cooling medium should not be too high or too low to avoid affecting the quality of the product.

3. The cooling speed can also be controlled by adjusting the design and structure of the mold.

The design and structure of the mold will affect the surface area and heat transfer effect of the product, thus affecting the cooling rate.

The cooling rate can be controlled by increasing or decreasing the heat dissipation area of ​​the mold, changing the material and thickness of the mold, etc.

The appropriate mold design and structure need to be selected according to the specific situation.

4. Pay attention to monitoring and adjusting the working status of the cooling system.

1. Before conducting optical inspection, you need to prepare some necessary tools and equipment.

This includes high-precision microscopes, measuring instruments (such as micrometers, vernier calipers, etc.), light sources, and microscope moving platforms.

These devices will help us observe and measure various parts of the mold and accurately assess its quality.

2. Appearance inspection of the mold.

This step mainly involves observing the surface of the mold with the naked eye.

Check for obvious defects or damage such as cracks, scratches, corrosion, etc.

At the same time, it is also necessary to check whether the size of the mold meets the design requirements.

3. The next step is to use a microscope to observe and measure every detail of the mold.

First, you need to adjust the magnification and focus of the microscope to obtain a clear image.

Then, microscopic textures or defects on the mold surface, such as bubbles, depressions, distortions, etc., are observed through a microscope.

If an abnormality is found, it needs to be recorded and repaired in time.

4. In terms of measurement, tools such as micrometers or vernier calipers can be used to measure the size of the mold.

These measurements will be used to evaluate the accuracy and precision of the mold.

At the same time, optical comparison instruments can also be used to compare the differences between the shape and contour of the mold surface and the design requirements.

5. The choice of light source is also very important.

Different types of light sources can provide different lighting effects and angles to better demonstrate the features of the mold.

For example, side lighting can emphasize molding details and reveal hidden flaws.

6. When conducting optical inspection, you need to pay attention to the following points:

1. We need to start from the design aspect and reduce the possibility of dimensional errors through reasonable mold design.

2. Processing surface treatment is also an important part of solving dimensional errors.

3. During the use of the mold, you also need to pay attention to some details to avoid dimensional errors.

4. When encountering dimensional errors, we can also take some adjustment and repair methods to solve them.

Foshan Boguan Rotational Molding needs to follow certain requirements and steps when conducting compressive strength testing to ensure that the test results are accurate and reliable.

The following are the requirements to note when conducting compression strength testing:

1. Test environment preparation:

When testing, you should choose a flat and stable ground for testing to ensure that the test bench is stable and not easy to shake, and to avoid the impact of external factors on the test results.

2. Sample preparation:

Select rotational molding material samples that meet the specification requirements for testing. The samples should be representative and sample preparation and processing should be carried out in strict accordance with relevant standards.

3. Test equipment preparation:

Suitable testing equipment should be selected for compressive strength testing. The testing equipment should be accurate and sensitive to ensure the accuracy of the test data.

4. Test method preparation:

According to relevant standards and requirements, develop detailed testing methods and procedures, including loading speed, loading method, number of tests, etc.

5. Test process control:

During the test process, the test conditions should be strictly controlled to avoid the influence of external factors on the test results and ensure the reliability of the test data.

6. Data recording and analysis:

Test data should be recorded in a timely manner and reasonable data analysis should be performed, including calculating compressive strength, drawing stress-strain curves, etc.

7. Result judgment and reporting:

Make reasonable judgments based on the test results, formulate corresponding improvement measures, write detailed test reports, and archive relevant information.

Rotational molding manufacturers need to ensure the stability of the production process level to ensure product quality and production efficiency.

1. Rotational molding manufacturers need to do a good job in equipment maintenance and upkeep to ensure the normal operation of the equipment.

Regularly check various components of the equipment to detect and repair faults in a timely manner to ensure the stability and reliability of the equipment.

In addition, the equipment needs to be cleaned and lubricated regularly to ensure smooth and stable operation of the equipment.

2. Rotational molding manufacturers need to establish strict production processes to ensure that every production link is carried out in accordance with prescribed procedures.

From the procurement of raw materials to the packaging of finished products, each link requires clear operating procedures and quality standards to ensure product consistency and stability.

3. Rotational molding manufacturers also need to provide professional training and technical guidance to their employees to improve their technical level and work quality.

Only with professional training and guidance can employees master the production process.

Be proficient in operating equipment, accurately control production parameters, and ensure product quality and stability.



4. Rotational molding manufacturers need to establish a strict quality control system and conduct comprehensive monitoring and testing of the production process.

Quality inspections are conducted at every production link to ensure that products meet standards and customer requirements.

For substandard products, discover and deal with them in time to prevent defective products from flowing into the market.

1. Product geometry and size measurement

2. Physical performance test

3. Appearance and color measurement

4. Chemical testing

5. Temperature resistance and corrosion resistance test

6. Environmental pollution testing

‌Waterproof and dustproof‌: The rotomolded medical box adopts a sealed design, which can effectively prevent the infiltration of dust and moisture and ensure the dryness and cleanliness of the internal equipment. This property is especially important in humid or harsh environments, protecting medical devices and pharmaceuticals from moisture and corrosion.

‌Strong and durable‌: Rotational molded medical boxes usually use high-strength materials, such as new PE materials or high-density polyethylene, which have high strength and toughness and can withstand large external impacts and pressures. Its solid structure and corrosion resistance allow it to maintain good shape and structure in harsh environments, effectively protecting the contents of the box.

Lightweight and portable: Although the rotomolded medical kit has a sturdy structure, it is relatively lightweight, making it easy to handle and carry. The box is usually equipped with wheels, handles and other designs to facilitate movement and transportation, and is suitable for various medical scenarios.

‌Versatility‌: Rotational molded medical boxes can be customized with different sizes and internal structures according to needs to adapt to the storage needs of different medical equipment. In addition, it is equipped with security designs such as anti-theft locks to ensure the confidentiality and safety of medical supplies.

‌Flexible design‌: The rotational molding process allows the box to be designed into various shapes and sizes to meet different usage needs. At the same time, the rotational molding box can also be equipped with various inserts, such as handles, locks, linings, etc.

Widely used: Rotational molded medical boxes are widely used in hospitals, clinics, first aid stations and other medical scenarios to ensure the safety, hygiene and effectiveness of medical devices and drugs during transportation and storage.

Advantages: 1. Never leak. It is formed in one step using advanced rotational molding technology, without welding and has good sealing performance. 2. Corrosion resistance, high compressive strength and good earthquake resistance. Using brand-new PE materials imported from abroad. 3. Small footprint. This product occupies about 45% of the area of ​​a traditional septic tank, saving land resources and having flexible site selection. 4. The treatment effect is good. Using microbial technology, there is no need to add other chemicals, which is simple and economical. 5. Long service life. This product is resistant to moisture, acid and alkali, oxidation, high and low temperature without deformation, and can be used normally for more than 50 years.

1. Installation

1. Measure the site setting and excavation dimensions according to the models and specifications of various septic tanks required by the customer (about 450mm-500mm wider than the actual size of the product), and connect in series When septic tanks are connected, the spacing between tanks is 400mm, and the excavation depth depends on the height of each type of septic tank. 2. Before digging the trench, power sources, water pumps, measuring instruments and excavation equipment should be prepared, and surrounding protection work should be done.

2. Foundation treatment

1. For general soil quality, a medium-coarse sand foundation layer with a thickness of 100-200mm can be laid on the original soil foundation or the backfilled and compacted foundation. 2. The pits must not be soaked by water. If the pits are indeed soaked by water, all accumulated water and silt in the pits should be removed first, and then be replaced with good dry soil and a medium-coarse sand base layer should be laid.

Method 1: First confirm whether the product is a hollow product. If it is not a hollow product or a foamed solid product, then it can basically be ruled out using rotational molding.

Method 2: Look at the product size. The injection molding process does not have such a large mold. If the plastic product to be made is very large and at least one of the dimensions of length, width and height exceeds the capacity of the current blow molding machine, or the width of the thermoformed sheet available in industry, then this kind of Products can only be produced by rotational molding.

Floor washing machine shell

Method 3: Look at efficiency and cost. If the demand for a plastic product is small, the production cost of blow molding will be very high. At this time, the low-cost advantage of rotational molding will be highlighted.

Method 4: Look at the material composition. The raw material of this plastic product is polypropylene, which is difficult to manufacture by thermoforming. If liquid polyvinyl chloride plastisol is used, it needs to be produced by rotational molding.

Method 5: Look at the product structure. If a plastic article contains a closed parallel double-walled structure, rotational molding is the molding method, since thermoforming requires more complex and expensive multifunctional molds. Rotational molding is also the best choice when the wall thickness of the product is required to be uniform or the outer corners need to be strong.

Method 6: Look at the shape. If a plastic product has a complex shape, such as a filter residue container, it is impossible to produce an integral product using blow molding or thermoforming. In this case, it can only be manufactured by rotational molding.

Polyethylene (PE) raw materials

PE is widely used in rotational molding processes for a reason:

, PE has a wide processing window and is suitable for long-term high-temperature environments, which reduces the requirements for rotational molding machinery;

Second, at room temperature, PE does not react with water, most greases, acids and alkaline substances, and has a wide range of applications;

Third, PE raw materials are low in cost and easy to promote.

Polypropylene (PP) raw materials

In the consumption structure of synthetic resins, polypropylene is the most common raw material after polyethylene. Compared with polyethylene, polypropylene has the following characteristics:

Low density: The density of PP is roughly between 0.85-0.93, while that of ordinary polyethylene is between 0.91-0.98. One of the reasons is that the crystallinity of PP is lower than that of PE;

Good mechanical properties: The tensile strength and elastic modulus of PP are generally higher than that of PE. At present, the mechanical properties of modified PP can even be comparable to that of PS (polystyrene), and it is widely used in electronic appliances and automobile fields;Good optical properties: Compared with PE, PP has much higher transparency;

1. Application of innovative technology in rotational molding equipment

Intelligent technology

Internet of things technology

New heating technology

Environmental protection technology

2. Future development trends of rotational molding equipment

Personalization and customization

Efficiency and energy saving

Intelligence and automation

Environmental protection and sustainable development

Advantages and disadvantages of rotational molding aluminum molds:

1. Price advantage: Except for small rotational molds, if medium-sized molds are made with steel plate molds, the mold cost can be saved by at least one-third.

2. Compared with aluminum moulds, steel plate formwork is easier to modify, repair and maintain.

3. Use steel plate mold. Since the wall thickness of the steel plate mold is only 2.5 or 3.0mm, the powder melting time will be shortened during the rotational molding process, which reduces energy consumption to a certain extent.

4. By combining traditional technology with CNC technology, precise rotational molds can be made. In the rotational molding industry, steel plate molds are still widely used.