Flextrusion series of Gravimetric blenders can be used for proportionally precise mixing of several types of material. A high precision electronic weighing scale is used to ensure precise weighing of every batch and ensure accuracy to ±0.1%～0.3%. (this series are not suitable for powder or fibre weighing)
Flextrusion series of Volumetric dosing unit has been designed for the automatic precise dosing of master batches, additives or plastic granules in a wide range of productions. Flextrusion has developed standalone Dosing system with Single or Twin screw feeding, which can dose small amount of material right into the feed throat.
A die head in polymer processing is a metal channel capable of providing a constant cross sectional profile to a stream of molten polymer. This allows for continuous processing of shapes such as sheets, films, pipes, rods, and other more complex profiles. This is a continuous process, allowing for constant production.
When extruded film will be wound onto a roll for later conversion, a rotating (or oscillating) die is sometimes used. As a die rotates about its center point, any variation in film thickness is distributed uniformly around the circumference, hence across the wound roll. This technique yields a flat roll instead of one with high and low spots.
There are many different screw designs, but most screws have three primary sections: feed, compression, and metering section. Our screws generally are constructed of 4140 steel. For certain polymers, particularly those that require high temperature or are highly corrosive, special metal alloys are used. Additionally, flight tip hardening can extend screw life.
Twin screw extrusion is used extensively for mixing, compounding, or reacting raw materials. The flexibility of twin screw extrusion equipment allows this operation to be designed specifically for the formulation being processed. Two screws may be corotating or counterrotating, intermeshing or non-intermeshing. In addition, the configurations of the screws themselves may be varied using forward conveying elements, reverse conveying elements, kneading blocks, and other designs in order to achieve particular mixing characteristics.
There are two main types of air ring designs single lip and dual lip. Single lip air rings are used with materials that are run with a reasonably stable bubble, such as low-density polyethylene. High-density polyethylene, which typically runs with a high stalk, also is usually run with single lip air rings. Dual lip systems are used with materials that are more prone to bubble instabilities, such as linear low-density polyethylene. This design provides airflow to both cool the bubble and aerodynamically stabilize it.
Extruders categorized in two type Single screw & Twin Screws. The extruder has been called the “heart” of the operation. Not only does it melt the solids and pump the polymer through the die, it also prepares the melt to be homogeneous and of constant temperature and pressure. Any deviations in composition or fluctuations in temperature or pressure lead to variations in the final product.
Our enhanced bubble stability cage comes in a wide range of Blow Up Ratio (BUR) which minimized surface friction to deliver a drag scratch free film prior to arrival to collapsing frame. Cage height adjustment can design with manual or motorized system depend to customer preference. Our cage provides a perfect concentricity to centre of die, to providing uniformity of layflat.
As the bubble moves upward and approaches the nip rollers, it is “pre-flattened” by the A shape collapsing frame. This device provides a smooth transition from a round tube shape to a flattened tube shape. Collapsing frames utilize wooden slats, metal rollers, Teflon-coated rollers, or an air cushion to perform the shape transition. In addition to flattening the tube, the collapsing frame also helps eliminate wrinkles in the final product. These devices can adjustable for both height and entry angle by manual or motorized devices. A pair of nip rollers is located at the top of the cooling tower which called Take off unit or Haul-off unit. Their purpose is to pull the film up from the die. Also, the nip serves as an air seal for the top end of the bubble, so, one of the rolls is rubber covered and next roller is Chrome plated.
Surface winders are used to collect the wound roll packages. They generally operate in a manner that produces rolls of constant web tension, as opposed to operating at a constant winding speed. Felxtrusion offers automatic / manual surface winder which handles the air shafts nominal size 3” and 6”. Winding roll diameter is up to 1.2 meter. Often 2 single winders are in back to back or Face to Face configuration connected by a bridge between both winders. We can add secondary nip with edge slitters for tube opening which is located on winders.