There are currently several rewinders for extrusion coating and lamination. The principle of using a rewinder is:
(1) A type of composite substrate to which a rewinding has been applied.
(2) Tension is required.
(3) The type of work to be performed by the secondary work or processing of the substrate.
We will examine each rewinder type and discuss the recommended methods based on the above three principles.
Surface rewinding machine
This method includes a motor-driven take-up drum, commonly referred to as a single drum surface rewinder. This surface rewinder is a roll of polymer coated paper (for fertilizer bags) and cardboard (for milk cartons). The best way to use the microwave oven. Such rewinding is also ideal for taking up paper/polyethylene/aluminum box/polyethylene composite paper (for use as a grain, baking, soup, gravy, etc.) such as bag making.
The machine can also perform the slitting operation on the rewinding machine with a line speed of more than 300m/min. The surface of the substrate without longitudinal slitting is rewinded. The known running speed is up to 600m/min and the diameter of the reel is 2750mm. Each roll has a mass of more than 1350kg. The same surface rewinder was successfully used to take up paper and paperboard on paper machines over 7620 mm wide. Since the wound substrate is facing the drum, a bearing paper core is often used; therefore, the offset force must be constantly measured, if the width will exceed the offset force of the shaft, and the small diameter shaft/core is used. This situation puts the production process in danger and completely loses the characteristics of the slitting in the surface rewinding machine.
As in any unwinding-rewinding operation, tension is an important measure to help determine if this surface coiling method should be used. The drum surface is usually of steel construction, but it can also be used for various substrates. The surface rewinder uses a single motor transmission, and the wound substrate is pressed against the driven drum by the pressure applied. Therefore, for extrusion coating, a single drum rewinder is generally not used in applications where the line speed is greater than 230 m/min and the tension is required to be less than 2 N/cm. Surface rewinders are generally considered for the take-up of inflated and cast films, but must also be based on their own advantages. Surface rewinders can also be equipped with manual or fully automatic different line speed reel delivery systems.
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