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Extrusion and Thermoplastics
Extrusion and Thermoplastics
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Extrusion and Thermoplastics

    Extrusion and Thermoplastics

    In a thermoplastic extrusion, the material is first softened by heating so that it can be shaped. This process is

performed by the extruder, or extrusion machine. This heat softening is

referred to by different names, such as ‘thermal softening’, ‘plasticization’, or ‘plastication’.

    Most extruders are single screw machines. The screw is what forces the material towards, and then through, the die. Shape

is imparted by the die, and/or by post-extrusion forming, and the product is then set to shape by cooling while maintaining

its shape. The equipment used to perform this process is known as the post extrusion equipment, while the entire system is

known as an extrusion line. In addition, there are food extruder machine and feed extruder


    Extruder Classification 

    Extruders may be categorized by three figures, for instance, 1-60-24. The first number specifies the amount of screws the

machine has, the second number indicates the screw diameter in millimeters (mm), and the third number indicates the effective

screw length as a multiple of the screw diameter. Therefore, in the given example, a single screw machine is being

described that has a screw diameter of 60 mm and a length of 24 (i.e., a L/D ratio of 24/1).

    Machine Construction

    Figure 1 shows a cut-away diagram of a simple single screw machine. This diagram shows the arrangement the different

parts of the machine. The two units - screw and barrel - interact together to convey the plastic material, melt the material,

and then push it through the die.

    The screw is rotated at a predetermined speed with the electric motor drive unit and gearbox. Temperature controllers are

connected to heating/cooling elements on the barrel to maintain the temperature at the set-point temperatures.

    The capability of the screw and barrel assembly to extrude a given material is based on the characteristics or

construction of the barrel and screw, the characteristics of the plastics material, and the circumstances under which the

system is operated.

    Post Extrusion Equipment

    When the extrudate leaves the die, it can either be set to the desired shape or its shape can be altered and then set to

shape. The equipment that performs this process is known as the ‘post extrusion equipment’ or the ‘haul off’, and in

terms of size, it is generally much larger than that of the extruder. This is because plastics take a considerable amount of

time to cool, and this cooling process determines the speed the line will operate.

    Pet Feed Machinery

    The growing demands of today’s pet food market require increasingly specialized knowledge combined with advanced

processing technologies. As a longtime partner to hundreds of premium pet food producers worldwide, we provides comprehensive

processing solutions and aftermarket services to keep your operations ahead of the curve. All to guarantee easy, safe, and

efficient operations that can quickly adapt to the next market trend.

    We offers a full range of pet feed machinery – from raw

material intake to finished feed bagging – as single unit or complete plant solution. The individual process machines

offered are selected from the standardized and proven range of product families.

    A wide variety of food products is produced worldwide on our complete twin screw extrusion processing lines to

answer increasing consumers demands :  cereals, snacks, crispy breads and crackers, baby food, textured proteins and

food ingredients.

    At the same time, we also offer pasta machinery

 and couscous turn-key processing lines integrating our specific design Rotante hot air drying


    To enable our partners in the Food industry to gain market shares and leveradge their brands, our expert teams are

continuously innovating  to develop and produce high-quality food products with new flavors and taste combinations.

    Pasta Production Line

    Over 50 years, pasta production line

has offered complete production solutions for a wide range of typical short-cut pasta shapes. Over the years, Clextral

experts have continuously refined every component in the production process, building high-performance lines to customer

specifications, including its exclusive VHT (Very High Temperature) drying system. Clextral short pasta extruders are

particularly adapted to the modern requirements of production in terms of cost-effectiveness, flexibility, ease of use,

hygiene and maintenance.


    The raw materials are mixed with a precise dosing mechanism to maintain constant flow and obtain homogenous dough in the

pasta extruder. The pressing phase is carried out with a single screw system specially designed to ensure optimal semolina

hydration, mixing, compression and extrusion. Once the dough is kneaded to the required consistency it is put through fitted

dies to produce the required shapes and cut to length. Drying is achieved in two phases : first, the pre-drying Trabatto is

used to crust the dough surface in order to avoid sticking. The second phase is done on Rotante drying units which include a

VHT (Very High Temperature) drying system, which offers several advantages, including faster pasta producton, heightened

quality of the final product (especially for pasta made with soft wheat), reduced product loss, short changeover times and

very hygienic processing. After drying, the pasta is cooled and stabilized in the industrial pasta machine and then

transported to storage or packaged directly.


    Clextral pasta extruders are designed and manufactured to strict production standards ensuring:

            Quality construction and superior hygienic standards – stainless steel parts, easy cleaning, low loss of

raw materials, etc.
            Quick and easy on-site assembly – modular pre-mounted parts 
            End-to-end process control – full automation to guarantee product consistency
            Flexibility – quick changeover, easy shape changes and adjustment of production parameters, capacity varies

from 1,500kg to 6,000kg/h
            Efficient maintenance – standardized extrusion and drying parts, easy access for servicing
            Follow-up services –training, support, new product design expertise
            Sustainability – intensified processing to generate energy and water savings, as well as cost-



    High-Quality Modified Starch Products

    Microtec Engineering Group is an eminent name in the modified starch industry. With a vision to be one of the world-

leading Provider  of premium modified starch technology, our focus is to

increase our penetration in global markets by helping clients to manufacture quality modified starch products using the

latest technology and strictly adhering to the Industrial Standards. Using our advanced equipment and processing technology

,you’ll obtain starch products that are distinguished from the rest. Our starch modifying equipment is designed to produce

top-of-the-line products that cater to the requirements of a widening customer base.

    Industrial Application of Our Modified Starch Technology

    Our modified starch machinery serves a wide range

of industrial applications. These include:

    1. Food

    Modified starches are excellent thickening agents. Our advanced starch modifying technology will enable you to provide

the required thickness, stretch ability, crispness, stabilizing and binding properties as well as texture to numerous food

products related to:

            Soups, sauces & gravies
            Pasta & noodles

    2. Textile

    Textile industry relies on the use of modified starch products as they reduce the breakage of fibre and wastage.

Especially when used on fabrics like polyester, cotton and acrylic, they yield satisfying results. Advanced starch enhancing

technology like ours can also help you to manufacture a wide number of products like:

            Thin boiled starch

    3. Paper & Packaging

            Paper – The demand for modified starch in the paper making industry is never less. The reason? Because

modified starch increases the bonding strength of paperboard and plain white paper. Our top-of-the-line technology is

instrumental in enhancing the strength, quality and brightness of the paper.
            Packaging – The adhesive property of modified starch is remarkable. Modified starch is an essential

component in packaging glue which, in turn, is used for making boxes and cartons. Our unique starch modifying equipment

enables you to impart excellent adhesive property to your packaging glue.

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