In the field of plastic processing, rotomolding is like a shining star, standing out among many processes with its unique advantages and wide application. Today, let us explore the secrets, advantages and wonderful applications of rotomolding in various fields.

1. Principle and process of rotomolding

2. Unique advantages of roto-molding process

3. Wide application of rotomolding process

4.Development prospects of rotomolding technology

The plastic fuel tank process has the following basic requirements for its mold:

1. The mold is not easy to deform and bend during repeated heating and cooling.

2. The mold should be equipped with an easy-to-loose clamping mechanism so that the mold can be tightly closed during heating and cooling, and can be easily opened when the product needs to be loaded and unloaded.

3. The design and installation of the mold should be conducive to the relative movement of the airflow around the mold surface.

4. The mold should be equipped with a ventilation pipe to prevent the gas in the mold from expanding due to heat during heating and squeezing out the molten plastic along the mold seam, and to prevent the negative pressure in the mold from causing the mold and the product to deform during cooling.

5. When designing the local structure of the mold, try to avoid deep cavities, deep holes, reinforcing ribs, solid protrusions and other structures.

6. Rotational speed of plastic fuel tank mold Usually, the rotational molding machine uses two adjustable speed motors to power the rotation and swinging motion of the mold around the main axis and the secondary axis.

7. The particle size of polyethylene powder of plastic fuel tank material has an important influence on its melting process.

In today's manufacturing industry, rotomolding equipment is playing an increasingly important role. This efficient, flexible and environmentally friendly manufacturing process is not only widely used in industries such as automobiles, home appliances and aerospace, but is also known as the "manufacturing process that shapes the future" because of its excellent performance and unique advantages.

Rotomolding is a thermoplastic molding process that uses heated plastic profiles to shape in a rotating mold. Compared with traditional injection molding, rotomolding can produce larger and more complex parts at a lower cost. In addition, rotomolded products have the advantages of seamlessness, high strength, corrosion resistance, and aging resistance, making it a substitute for metal and traditional plastic products in many fields.

Core advantages of rotomolding equipment

Flexibility: Rotomolding equipment is suitable for parts of various shapes and sizes, from small parts to large structures, which can be easily achieved. This flexibility enables companies to quickly adapt to market demand and achieve customized production.

Efficient productivity: Rotomolding is superior to traditional injection molding in production efficiency. It can achieve continuous production and reduce the time and cost of mold replacement. In addition, the production cycle of rotomolding equipment is short, which reduces waste in the production process.

Environmental protection: The rotomolding process uses thermoplastics, which can be recycled and reused during the production process, reducing the impact on the environment. At the same time, since no solvents or additives are needed in the production process, it is also more friendly to the health of operators.

Color inspection of rotomolding product is a very important quality control step to ensure that the appearance quality of the product meets the requirements.

The following are the steps for color inspection of rotomolding molds:

1. Preparation: First, you need to prepare a standard color sample, which is customized according to product requirements. It can be a color card or a physical sample.

2. Adjust equipment: Ensure that the inspection equipment is in normal working condition, such as adjustment and inspection of light sources, cameras and other equipment to ensure that color information can be accurately captured.

3. Sampling inspection: Take a certain number of product samples from the production line. The number generally depends on the production batch and product specification requirements.

4. Comparative inspection: Compare the sampled product samples with the standard samples, and detect the color difference by naked eye or using professional color difference instruments.

5. Record data: Record the inspection results, including the color data of each sample, specific difference values ​​and other information, for subsequent reference and analysis.

6. Analysis results: Analyze according to the inspection results, find out the samples with unqualified colors, find out the cause of the problem, and adjust the production process in time.

7. Adjust production: Make necessary adjustments based on the analysis results, such as adjusting the raw material ratio, temperature control, etc., to ensure that the color of the next batch of products meets the requirements.

8. Follow-up: As production progresses, color inspections need to be carried out continuously, and abnormal situations need to be followed up and handled in a timely manner to ensure stable product quality.

There are usually metal inlays on roto-molded products. During roto-molding, the inlay is equivalent to a part of the mold, which increases the wall thickness of the mold here. It is not easy for the end of the inlay to obtain the same temperature as the mold, resulting in poor resin coating on the inlay, and large inlays are more likely to be unevenly coated.

How to solve the poor coating of modified plastics in roto-molded products?

1. Eliminate factors that are not conducive to heat transfer of inlays, so that inlaid metal parts have a good heat transfer structure.

2. Under the premise of meeting the roto-molding conditions and the strength requirements of inlays, the height and volume of the inlay relative to the surface of the product are as small as possible.

3. The depth and width of the anti-rotation and anti-pull grooves on the inlay are suitable for roto-molding requirements.

4. During roto-molding, preheat the inlay according to the actual situation, so as to achieve good results, which is more suitable for roto-molded products with large inlays.

At present, most orders for roto-molded products from abroad directly indicate that linear low-density polyethylene (LLDPE) roto-molding special materials are used for roto-molding. Most of the products are cleaning machine housings of different specifications, lawn mower housings, cargo transport boxes, storage boxes, various mechanical and electronic packaging boxes, double-layer insulation boxes with foam layers inside, auto parts, etc., which have high requirements for roto-molding technology. my country's roto-molding technology and roto-molding mold processing technology have improved rapidly, but there is still a gap in roto-molding product design compared with Europe and the United States.

1. It should be as thin as possible (can save energy) and has a direct impact on the wall thickness and performance of the product (too thick can easily lead to different material temperatures in the mold cavity). It is also related to the rotomolding method and heating system, such as: the hot liquid conduction heating mold δ should be thickened = 12-15mm to ensure that the liquid quickly heats the tear mold and the temperature is uniform. For molds used for hot air circulation heating, δ is thinner (5-7mm).

2. The rotomolding container should have an exhaust port to discharge the low molecular weight compounds that are decomposed due to the increase in pressure in the mold. The exhaust port is a thin-walled metal plastic tube that extends to the center of the mold cavity. To prevent the powdered resin from overflowing from the exhaust port during rotation, the hole is filled with materials such as glass wool and graphite powder.

3. The material requirements are not high. Good thermal conductivity, elongation, weldability, and heat resistance are sufficient. Steel and aluminum are common. The time required for heating the roto-molded container is the primary part of the heating cycle, so the mold material has a great influence on the heating cycle. For example, when a nickel mold with a temperature of 205°C and a thickness of δ=3.2m is heated equally with a lead mold with a thickness of 614mm, the time h1 is smaller than h2. Roto-molding container mold: mold rotation and revolution speed, etc. To obtain products with uniform wall thickness, the mold rotation and revolution speed and speed ratio are very important factors.

1. Daily inspection and cleaning

2. Regular maintenance

3. Regular maintenance and maintenance recommendations

4. Safety precautions

1. Technological innovation: improving performance and customized services

Technological innovation is an important driving force for the development of roto-molded equipment boxes.

2. Environmentally friendly materials: responding to the call for green production

Today, with the increasing awareness of environmental protection, the production of roto-molded equipment boxes will also pay more attention to the use of environmentally friendly materials. In the future, rotomolding equipment boxes will use more environmentally friendly materials such as bio-based materials and degradable materials to reduce the impact on the environment.

3. Intelligent application: improving user experience and efficiency

With the rapid development of technologies such as the Internet of Things and big data, rotomolding equipment boxes will gradually be integrated into intelligent applications. In the future, rotomolding equipment boxes may be equipped with Internet of Things technologies such as smart sensors and RFID tags to achieve real-time tracking and monitoring of items.

4. Diversification of application fields: expanding market space and potential

Rotomolding equipment boxes have been widely used in many fields due to their unique performance and advantages. In the future, with the advancement of science and technology and changes in the market, the application field of rotomolding equipment boxes will be further expanded.

5. Industry chain integration: optimize resource allocation and collaborative cooperation

In the future, the industry chain of roto-molded equipment boxes will be further integrated and optimized. The cooperation between upstream and downstream enterprises will be closer, jointly promoting the development of the roto-molded equipment box industry.

1. Appearance inspection

Appearance inspection is one of the intuitive inspection methods.

It can be observed by visual inspection whether there are cracks, fading, deformation, etc. on the surface of the product, and

whether the surface quality of the product meets the requirements.

2. Strength test

Strength test is to test the ability of the product to withstand stress in the external environment.

Through tensile, extrusion and other experimental methods, the strength of the product is tested to meet the design requirements, and it is ensured that it is not easy to deform or break during use.

3. Weather resistance test

Weather resistance test is to test the ability of roto-molded products to withstand the influence of natural factors such as sun exposure, rain, temperature changes, etc. under different environmental conditions.

Common weather resistance tests include ultraviolet exposure test, high temperature and humidity test, freeze-thaw cycle test, etc., through which the weather resistance of the product can be evaluated.

4. Chemical performance test

The weather resistance of the product is affected by chemical factors, so chemical performance test is required,

including the test of chemical stability, antioxidant and other indicators of the product, to ensure that the performance of the product in different chemical environments meets the requirements.

5. Aging test

The aging test simulates the situation that the product is exposed to the natural environment for a long time during use.

The weather resistance of the product in actual use is evaluated through accelerated aging test to ensure that its lifespan meets the requirements.

1. The mold is not clean

There are generally three reasons for the unclean cleaning of roto-molding molds.

（1） The mold temperature is too low or too high, and it is not within the appropriate use temperature range of the cleaning agent. The cleaning agent does not react fully with the surface of the roto-molding mold, resulting in poor cleaning effect.

（2）The mold deposit is too thick, making it impossible to completely clean the roto-molding mold at one time.

（3） The cleaning agent reacts on the surface of the roto-molding mold for too short a time, fails to fully soften the free dirt substances, and the decontamination is not thorough.

2. Mold damage after cleaning

In order to quickly remove stubborn stains and achieve the effect of roto-molding mold cleaning, some people will choose strong acid and strong alkaline mold cleaning agents for cleaning. Although this can solve the cleaning problem of roto-molding molds, it will corrode roto-molding molds and equipment, thereby shortening the service life of roto-molding molds and equipment.

3. Mold sticking after cleaning

Will grease, dirt, mold release agents, resins and colorants cause mold discoloration and mold performance deterioration? The following are three methods for cleaning roto-molding molds and improving part quality:

1. Dry ice cleaning

2. Solvent cleaners

3. Water-based cleaners

1. Analysis of the causes of warping and deformation

Although roto-molded products are non-pressurized, they are less prone to warping and deformation than other pressurized molding methods.

However, roto-molded products are generally complex in shape, uneven in wall thickness, and not completely symmetrical.

This causes the cooling rate and shrinkage rate between different parts of the product to be inconsistent, and warping and deformation occurs in large planes and parts with large wall thickness differences.

PE products have a relatively large shrinkage rate after roto-molding, generally 2% to 3%, or even as high as 3% to 5%.

The dimensional accuracy is poor, and the shrinkage rate is even higher in parts with large local linear dimensions.

The shrinkage of the product is also related to factors such as the heating temperature, cooling and shaping temperature, cooling rate, and product demolding temperature during product molding.

Especially in the process of product demolding, many roto-molding manufacturers start demolding when the product temperature is 70 to 80°C or even higher in order to pursue production efficiency.

Then the product shape is controlled by post-molding treatment. Since the factors of human control in the demolding process are too strong, the shrinkage of the product is more difficult to control.

For products with strict requirements on the product's external dimensions and deformation.

2. Solutions for warping and deformation

When designing rotational molded products, try to avoid large planes.

Structural forms such as reinforcing ribs, steps, overlaps (bridges) or surface groove decorations can be used to reduce the plane area, thereby controlling warping.

Adjust the position of the mold on the mold frame to eliminate factors that increase the wall thickness difference and affect the uniformity of heating and cooling.

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