Nickel 80% Chromium 20% Nicr Alloy Wire For Plastic Bag Sealing Industry
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Nickel 80% Chromium 20% Nicr Alloy Wire For Plastic Bag Sealing Industry
1. Detailed Description
Nichrome is basically a name given to nickel-chromium resistance
wires. It is a non-magnetic alloy, which consists of 80 percent
nickel and 20 percent chromium by weight, and is widely used in
heating elements because of its relatively high resistivity. Out of
the constituents of nichrome, nickel is an element with the
chemical symbol Ni and atomic number 28, whereas chromium is an
element with the symbol Cr and atomic number 24. Nickel is
generally a silvery-white lustrous metal, and chromium, a
steely-gray and hard metal. Nichrome, the alloy, is silvery-gray in
color, resistant towards corrosion, and has a high melting point. · Electrical Resistivity at room temperature: 1.0 x 10-6 to 1.5 x 10-6 ohm m · Thermal Conductivity: 11.3 W/moC · Magnetic Attraction: None · Thermal Expansion Coefficient (20oC to 100oC): 13.4 x 10-6/oC · Temperature Coefficient of Resistivity (25oC to 100oC): 100 ppm/oC · Specific Gravity: 8.4 · Density: 8400 kg/m3 · Melting point: 1400oC · Specific Heat: 450 J/kgoC · Modulus of elasticity: 2.2 x 1011
2. Sealing Machine For a vertical form-fill-seal the film approaches the back of a
long hollow conical tube, which is called the forming tube. When
the center of the plastic is near the tube, the outer edges of the
film form flaps that wrap around the conical forming tube. The film
is pulled downward around the outside of the tube and a vertical
heat-sealing bar clamps onto the edges of the film to create the
"fin Seal", bonding the film by melting the seam edges together. To start the bagging process, a horizontal sealing bar creates the
"Bottom Seal" by clamping across the bottom edge of the tube,
bonding the film together, and cutting off any film below. This
sealing bar can be on a fixed height, which is called an
intermittent sealing process. Faster systems include a sealing bar
that moves down with the bag while sealing. This is called a
continuous process. The product is either pre-measured by a
multi-head weighing system or the sealed tube end is then lowered
onto a precision weighing table and the product to be bagged is
dispensed through the long conical tube in the center of the bag.
When the gross weight of the product-filled bag is reached, filling
stops, and the horizontal sealing bar seals the top of the bag,
simultaneously forming the bottom of the next bag above. This bag
is then cut off from the tube and is now a sealed package, ready to
advance onward into the product boxing and shipping processes.
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| Product Tags: 20% Chromium Nicr Alloy Wire 80% Chromium Nicr Alloy Wire 80% Nickel Nicr Alloy Wire |
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