A vacuum cleaner, also known as a sweeper, is a device that uses an air pump (a centrifugal fan in all but some of the very oldest 

models), to create a partial vacuum to suck up dust and dirt, usually from floors, and from other surfaces such as upholstery and 

draperies.
The dirt is collected by either a dustbag or a cyclone for later disposal. Vacuum cleaners, which are used in homes as well as in 

industry, exist in a variety of sizes and models—small battery-powered hand-held devices, wheeled canister models for home use, 

domestic central vacuum cleaners, huge stationary industrial appliances that can handle several hundred litres of dust before being 

emptied, and self-propelled vacuum trucks for recovery of large spills or removal of contaminated soil. Specialized shop vacuums 

can be used to suck up both dust and liquids.

Specifications of Hot Dip Galvanized Steel Coil:

1) Capacity: about 15000 tons per month for the steel sheet and coil product
2) Grade: SGHC, SGCC, DX51D, Q195, all according to the customer's request
3) Standard: JIS G3302 1998, ASTM A653M/A924M 2004, all according to the customer's request
4) Thickness: from 0.12mm to 5.0mm, all available
5) Width: from 600mm to 1500mm, all available
6) Coil ID: 508mm/610mm
7) Coil weight: from 2-10MT, according to the customer's request
8) Zinc coating weight: 30g/m² - 600g/m², double side
9) Spangle: big spangle, regular spangle, small spangle, zero spangle
10) Surface treatment: Chromated, oils, passivating + oils
11) Edge: mill edge, cut edge
12) Min trial order 10 ton each thickness, 1x20' per delivery 

13) Surface Treatment of Hot Dip Galvanized Steel Coil:

14) Spangle of Hot Dip Galvanized Steel Coil:

15) Features: Hot dip galvanized steel features excellent forming properties, paintability, weldability, and is suitable for fabrication by forming, pressing and bending. It is also Environmental Friendly resource because of its longevity in corrosion protection, low environmental cost, and 100% recyclability. 
16)  Product qualities:
a) CQ - Commercial Quality steel for structural applications
b) SQ - Structural Quality steel for applications that need more draw ability
c) LFQ - Lock Forming Quality
d) DQ - Drawing Quality
e) DDQ - Deep Drawing Quality

※Other Grade: S220GD+Z, S250GD+Z, S280GD+Z, S320GD+Z, S350GD+Z, S550GD+Z

※Thickness: from 0.25mm to 3.0mm, all available

※Width: to 1300mm, all available

The Manufacturing of Hot Dip Galvanized Steel Coil

Plastic parts

1) Many of a vacuum cleaner's plastic parts begin with computerized drafting and design systems (CADD). The parts are shaped in a two-part steel mold, called a die that is lowered into the chamber of an injection-molding machine.

2) Tiny plastic pellets stored in a large hopper next to the machine are poured into heating vat and melted. The pellets are either purchased in the color desired or colored with pigments as they are melted.

3) The melted plastic, injected under high heat and pressure into the chamber of the injection molding machine, penetrates every part of the mold. The two halves of the mold open enough to let the plastic part fall into a bin. Although the pieces are still hot to the touch, the plastic hardens on contact with the air as the tool opens. The plastic pieces are stored in bins that can be rolled to the assembly line as needed.

4) Many identical plastic parts of the same type are made during the injection process. When the desired number have been made, the tool is removed from the injection molding machine, another one is inserted, and the process repeats as supplies of another part are formed.

The assembly line

5) Vacuum cleaners are manufactured in an assembly-line process, with workers at assembly stations attaching subassemblies or individual parts to the vacuum as it moves along the line. Assembling an upright vacuum starts with the base, which is made of metal or molded plastic. The steel beater bar with brushes fitted into (a subassembly) is then pulled from a bin and inserted into fitted notches at the front of the base. The beater bar has a locknut on one end and a cap on the other so the owner can open it and replace the brushes when necessary. A rubber drive belt is placed in a guide channel around the beater bar and pulled over a belt guide and motor pulley on the underside of the base.

6) A steel base plate is fitted into notches in the front of the base and latched into place with a cam lock (a turning lever) over the underside of the belt and pulley. The steel base plate is a subassembly that has small rollers on it and openings near its front where the beater bar and brushes will agitate the carpet (to release dirt) during operation.

7) At the rear of the base, an axle is inserted through a tunnel-like opening that passes from one side of the base to the other. A release handle is fitted onto one end of the axle; it is a simple locking lever that allows the vacuum's operator to lower the handle during operation or raise and lock it into place for storage. Wheels are added to both ends of the axle and are locked into place.

8) The fan is bolted onto the base, and the motor assembly is attached to the top side of the base. The electrical connections from the motor to the fan and light, and from the motor to the electrical cord connection are made. A lightbulb is installed in a socket in the front of the base. A plastic housing that forms the top of the vacuum cleaner and fully encloses the motor and fan is snapped into place. It has already had a rubberized bumper wrapped around its sides and front. It also carries a clear plastic panel allowing the light bulb inside to shine through as a "headlight."

9) Plastic fittings that support the bag and handle are attached to the rear of the base. An opening at the back of the base holds a rubberized length of flexible hose that transfers dust from the fan to the bag; this hose is fastened to the base opening and to the plastic fitting leading into the bag support. At the top end of the handle, a plastic unit that holds the top end of the bag is bolted through the handle. Next, electrical connections inside the handle are completed, and the electrical cord that has been attached to the back of the base is tied to the connections within the handle, allowing the machine's operation to be controlled by a switch near the top of the handle. The length of electrical cord leading from the machine to a power outlet is connected. For packing and shipping, this cord is looped and tied with a twist tie; the owner will wrap it around storage supports on the handle.

10) The final touches are added, including attaching the bag, the inner disposable bag, and outer markings (preprinted on decals that list the manufacturer, operating instructions, and information such as the serial number and the power of the motor).

11) The completed machine is taken to packing department where it is wrapped in a plastic bag and put in a carton. A box of plastic attachments, including nozzles and a hose for upholstery cleaning, is also put in the carton with an information booklet, assembly instructions, and a warranty card. The cartons, which have been preprinted with marketing information, are then closed, sealed, and stored for shipping and distribution.

Packaging Information of Hot Dip Galvanized Steel Coil

Shanghai Metal Products are packed and labeled according to the regulations and customer's requests. Great care is taken to avoid any damage which might be caused during storage or transportation. In addition, clear labels are tagged on the outside of the packages for easy identification of the product I. D. and quality information.

1) Shanghai Metal Standard

2) Customization

Applications of Hot Dip Galvanized Steel Coil:

1) Construction and building: roofing, ventilating duct, handrail, partition panel, etc.

2) Further processing: coating base plate

3) Electric appliance: refrigerator, washing machine, recorder, microwave, etc.

What is Galvanized Steel?

There are two typical galvanizing ways to obtain a zinc coating: hot dip galvanizing and electrogalvanizing. Hot dip galvanizing is the process that steel is immersed into molten zinc bath to get a zinc coating surface. This not only helps protect steel from rust and corrosion, but also gives the steel a shiny attractive appearance. Electrogalvanizing is the process that uses electrolysis to coat the steel with zinc, which is neither cost-effective nor environmentally friendly. It is hardly to find electrogalvanized steel in our lives nowadays.

What are the advantages of Galvanized Steel?

Because of permanently and successive zinc/iron alloy layers, galvanized steel offers many benefits:

1) Corrosion Resistance: the zinc coating surface protects the base steel not only by providing barrier to corrosion elements, but also by the sacrificial nature of the coating. Galvanized steel often remains in working order with little maintenance for 40 years or more.

2) Excellent Surface Appearance

3) Formability: it can be simply bend to parts with deep drawing requirements

4) Paintability: it can be painted with different colors

5) Weldability: it is accepted various welding practices

What are the disadvantages of Galvanized Steel?

In spite of many benefits, galvanized steel is not always an ideal choice. Galvanized steel cannot be used underground without being properly covered, which can be inconvenient for many jobs.

Where do we use Galvanized Steel?

It is primarily used in the construction industry, such as roofing, wall cladding, and support beams. It is also used in the automotive industry, due to its enhanced paintability, weldability and corrosion resistance. Moreover, it is an essential material for white goods application, such as refrigerators, air-conditioners, washers, microwaves, vending machines and audio visual systems.