The main composition of glass wool contains SiO2 , CaO, MgO, AL2O3,,  Na2O, K2O, B2O3 and BaO.

The raw materials for making glass wool include scrap sheet glass, silica sand, feldspar, limestone, dolomite, soda ash, salt cake, borax, etc.

The production process of this line includes raw material preparation, melting, fiberizing, fiber collection, curing, finishing and packaging.

Qualified  raw  materials  based on chemical analyses are separately weighed and homogeneously mixed according to the batch formula, and then sent to the furnace bin.

Mixed powder materials (batch) are uniformly fed into the furnace by a batch charger.The batch is melted by high temperature flame in the furnace and homogenized in the refining zone to become homogeneous boron-containing molten glass and then flows to the forehearth.

Molten glass flows through the forehearth to the bushings made of Pt/Rd alloy and kept at constant temperature, from which continuous and stable glass streams flow out and fall down into the spinner. The spinner rotates at high speed and forces molten glass out of the small holes in the sidewall of the spinner by centrifugal force to  form  primary fibers,  which  are  then  attenuated  into  glass  wool  by  the  high temperature and high velocity flame blown from the circular gap of annular burners mounted around the spinner. The jet flame from the burners not only attenuate the fibers, but also maintain the temperature required for the spinner.

To  uniformize  the  upper  and  lower  temperature  of  the  spinner  sidewall,  internal burners are fitted on the inside of the spinner. In the course of downward movement of fibers, they are further acted by the air-jet fiber attenuator and air cutter to achieve desired effect.

The falling fibers are coated with binder by spraying binder and water.To collect the fibers on the collection conveyor belt to form blanket, a suction chamber is provided under the conveyor belt, which is connected with suction fans to create negative pressure  at  the  belt  surface  .To  ensure  the  transverse  uniformity  of  the  blanket.formed on the  belt, fiber distributors  are  provided  at  both  sides  of the collection conveyor.

Waste  gas  from  the  fiber  collection  section  is  emitted  to  atmosphere  after  dust separation by water scrubbers .  

Due to the adherence of some binder and fibers to the collection conveyor sides and belt, cleaning and washing devices are provided to clean them off to a collecting pool  at the bottom, and waste water containing binder is recycled    through filtration and cleaning treatment to realize “zero discharge ”

The  use  of  above  systems  can  not  only  decrease  air  pollution  and  avoid  water pollution, but also recycle much binder so as to reduce the production coat .

The uncured blanket on the collection conveyor passes a wool lifter and a compacting device before entering the curing oven.The  oven  contains  upper  and  lower  flight conveyors  and  hot  air circulation systems.  Here  the  uncured blanket containing binder is pressed between the flights and dried/cured by hot air to become glass wool blanket or board of certain density and thickness .

The oven  isdivided  into  four  zones,eachn of which has an independent hot air circulationsystem .

For efficient cooling of hot blanket (broad) to facilitate next operations ， a cooling conveyor is provided at the exit of the oven.

Depending on the size requirement by customers, the glass wool blanket or board is slit, faced and cut on line. The edge trims are recycled by crushing and sending back by fans to the collection conveyor to be mixed with fresh fibers.

Glasswool blanket is rolled up by a rolling machine and packaged in polyethylene film bag.

Glass wool board is packaged by shrink film packaging machine .