Assisted plastic injection ­ with support of gas ­ and water

Assisted injection of plastics (English: AIM = Assisted Injection moulding is a type of plastic processing that improves the quality of products and significantly saves production costs. This technology involves injection of gas or water under high pressure into plastic contained in an injection mould.

Assisted injection of plastics with gas and water

Compressor­ stations

Maximator compressor stations are specially designed for pressurizing nitrogen or carbon dioxide from gas bottles and are used for generating pressure during the gas injection process.

Compressor­ stations

Regulation modules

Maximator regulation modules are suitable for series production involving high-pressure nitrogen or high-pressure carbon dioxide under a pressure of 500 bar (7,250 psi). The regulation module controls the injection pressure in the GID process.

Regulation modules

Compressor regulation modules

Maximator compressor regulation modules are used in the GIT process in the process of using mould samples or in smaller production operations using gas from gas bottles. Using the integrated Maximator compressor, gas is compressed to the required pressure and then its pressure is adjusted to the required value using the pressure regulator.

Compressor regulation modules

Equipment for injecting­ plastics­ with gas support

MAXIMATOR devices for injecting plastics with gas support are suitable for the WIT process in series production of components of large diameters or with channels. This variant of the injection process is characterized by significantly shorter cycle times and zero gas costs.

Equipment for injecting­ plastics­ with gas support

Gas dosing systems

MAXIMATOR gas dosing stations are designed for high-pressure dosing of inert propellant gases during physical foaming of plastics. Physical foaming of plastics is part of special technological processing, such as extrusion foaming, polyurethane foaming, and injection foaming (microcellular foaming).

Gas dosing systems

Gas injectors

Gas injectors

Assisted injection of plastics with gas and water

What is meant by assisted injection of plastics?

Assisted injection of plastics (English: AIM = Assisted Injection moulding) is part of the processing of plastics that improves the quality of products and significantly saves production costs.

This technology involves injection of gas or water under high pressure into plastic contained in an injection mould. This way, the component is perforated with cavities to reduce its weight. The compression pressure can be better distributed and pitting prevented. The distribution of gas pressure over the component´s surface is equalized, which also helps eliminate pitting and reduces the closing force, thus often reducing its weight and cycle time.

Other methods make it possible to produce foam from plastic resins to reduce the density of the material or to change the temperature of the injection mould to prevent the formation of cold joints. Depending on the specific application, various technologies can be combined, which brings further benefits.

Service for assisted injection of plastics with gas and water support

Our team of over 50 professionals operating in 20 branches located around the world has the technical facilities and the relevant engineering expertise necessary to be able to provide technical support throughout the whole production process from commissioning and operator training to maintenance tasks.

Moreover, for your equipment for assisted injection of plastics, we continuously ensure the supply of original spare parts.

We emphasize transparency and therefore we provide you with brief information on the product and the principle of functionality of individual technologies, so that you can achieve time and cost savings from the start.

Safe and competent handling of the product during its operation and maintenance can extend the service life of all the components and eliminate unnecessary operational downtime – your investment is thus ensured in the long term. Maximator service and maintenance contracts guarantee the execution of regular preventive servicing and upkeep of your equipment.

We will facilitate your daily work by organizing your service and maintenance schedule. We will plan and carry out ongoing maintenance to ensure that your machine maintains its maximum performance.

DESIGN, CONSULTANCY, AND INJECTION MOULD EXPERTS

Our design, consultancy, and injection mould experts are available worldwide to show you how your products and your company can benefit from the plastic injection technology with gas support – from the initial concept to production. In case of need, we will provide you with CAE plastic injection analyses.

Studies of injection moulds
Studies of injection mould can be performed in our facilities worldwide or our technicians can monitor the processes directly on-site at injection mould manufacturers.

Complete training for our customers:

  • User/operator – operation of all Maximator products and processes
  • Maintenance engineers – service and maintenance of Maximator products
  • Designers – design of equipment for injection of plastics with gas support with focus on taking full advantage of the economic and technical advantages of this technology
  • Business engineers – benefits and advantages of the technology of injection of plastics with gas support, as well as greater flexibility in the development phase with focus on increasing sales turnover through new product applications

Partial mould filling technology

Injection phase

  • 70% ± 20% of the nest volume is dosed and injected
  • gas injection takes place, depending on the method chosen, using a mechanical nozzle, injectors in the inlet or in the moulding

Gas injection phase

  • begins shortly before the end of the injection phase to avoid transient traces
  • gas fills the nest and pushes the melt forwards
  • this creates targeted cavities in the moulding

Gas boosting phase

  • when the nest is completely filled up, the gas pressure is maintained steady until a stable shape of the moulding is formed
  • compressed gas pressure decreases when the melt solidifies

Melt blowing technology

Melt reverse injection method

  • The moulding is completely filled with the mass – at the end of the flow path, gas injection begins.
  • The force of the compressed gas pushes the plastic core back into the plasticization cylinder and the threaded piston withdraws.

Secondary cavity method

  • The moulding is completely filled with the mass – at the end of the flow path, the hydraulic slide opens a secondary cavity and simultaneously starts the injection process.
  • The compressed gas pushes excess mass into the secondary cavity.

Technology for assisted injection of plastics with gas and water support

In order to use the technology of assisted injection of plastics with gas and water support, it is necessary to implement basically two additional functions: pressurization and pressure regulation.

There are two types of gas compression used in assisted injection of plastics with gas support. On the one hand, it is intermittent gas compressing that is used mainly in the GIT process of individual machines, and on the other hand, continuous compressed gas generating that uses central supply of compressed gas to several injection presses. Gas pressure regulation is ensured by individual pressure regulating modules for each injection press. The pressure regulating module reduces the pressure that the system generates to the required gas pressure. Communication with the injection press is handled by an electrical control system. Maximator offers compressor station, regulation modules, as well as combined compressor-regulation modules, both for intermittent and continuous gas compression.

In the field of assisted injection of plastics with water support, the WID MAXIMATOR device has the capacity both for pressure generating and pressure regulating (in one combined device). The following diagrams show the general structure of the technologies used.

Assisted injection of plastics with support of liquid gas

Liquid nitrogen supply

Liquid carbon dioxide supply

Assisted injection of plastics with support gas supplied from gas bottles

Compressor station and regulation module

Compressor regulation module

Assisted injection of plastics with water support

Gas dosing systems

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