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IR Sensors in extrusion coating
Plastic Processing
Plastic Processing
Improve productivity and efficiency of plastic processing using accurate temperature data
Gain the ability to measure temperatures of individual targets or the complete width of the target
Use noncontact infrared sensors to avoid product contamination or process interference
Quickly detect potential problems to avoid scrap, waste and energy loss
Control temperature of fast moving parts

 

Milk bottles, motor oil containers, orange juice containers, and many other bottles are extruded in the form of a tube. The tube is cut to length and placed in a mold where it is blown to the shape of the container. 

Laser plastic welding is a process by which a laser is used to bond plastic materials. Widely used in the automotive industry, as well as medical and electronics sensor industries, laser polymer welding provides low thermal and mechanical loads to the component, is highly flexible, and doesn’t involve the use of particles or solvents.

The process of extrusion coating (on top of substrate) and extrusion laminating (between two substrates) similarly forces a molten thermoplastic resin through a horizontal die onto a moving web. Substrates include paper, aluminum, card and printed films.

Cast films are typically used in packaging industry or as coating substrates in extrusion coating processes. In the cast film extrusion process, the melt is extruded through a wide die as a thin web and is cooled on a metal casting roll.

In cast film production, polymers are melted through a slot or flat die (extruded) to form a thin molten film. This film is attracted towards the surface of a chilled roller using the force of an air knife or vacuum box, where it immediately solidifies. The film then passes through a series of chill rollers before being edge-trimmed and typically wound on a roll. Some machines will extrude a number of films for a laminated final product.

 

 

Rotomolding and slush molding are unique plastic processing techniques used to manufacture large plastic products: rotomolding products, such as water and chemical tanks, automotive fuel tanks, children's play equipment, and canoes, in addition to slush molding products, such as automotive interiors and dashboards.

The processes involve forming the plastic product in a large heated mold. Polymer granules are added to the mold, which melt and form a skin on the internal surface of the mold as it is rotated inside the oven. After thermal processing, the mold is cooled and the finished formed product is removed. Different polymers can be used in Rotomolding, such as Polyethylenes (LDPE, HDPE), ABS, Nylon, and Polypropylene. Each polymer has its own unique thermal characteristics, so the process heating cycle needs to be optimized for the polymer used.

Natural rubber has some serious defects; it is weak, easily becomes sticky and is not very elastic. To improve the physical properties (strength and heat resistance) of the material, it is taken through a vulcanization process, in which the polymeric chains of rubber undergo a crosslinking reaction, initiated by the addition of sulphur to form a stable 3D network . This reaction occurs at room temperature, but very slowly. To increase the rate of the chemical reaction, heat is applied. Many products in a vast range of industrial sectors, including Automotive (e.g., door seals and windshield wipers) need to be thermally treated to undergo vulcanization to maximize product performance. Vulcanization can be perfomed using either batch or continuous oven technology.

In plastic sheet extrusion production, polymers are melted through a slot or flat die (extruded) to form a thin, molten sheet. This sheet is is attracted towards the surface of a chilled roller where it immediately solidifies. The sheet then passes through a series of rollers which will determine thickness and texture before being edge trimmed and cut to the required size (heavy gauge sheet) or wound onto a roller (thin gauge sheet). Extruded plastic sheets are often used for thermoforming into a final shape (for example in the manufacture of refrigerator or freezer internal panels or plastic beverage cups).

The process involves extruding a tube of molten polymer (typically polyethylene) through a die and inflating it to several times its initial diameter to form a thin film tubular bubble. This bubble is cooled as it is drawn upwards and eventually freezes, before collapsing to be wound and either slit for processing as a flat film or kept in tubular form for making plastic bags. Solidification occurs at the frost line and the position of this frost line is controlled by several parameters, such as airflow, speed and difference to the surrounding temperature.

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