melt blown production line

Melt Blown Method Meltblown Fabric Overview Production Process

1. Overview
Melt-blown non-woven fabrics are mainly used as composite materials, filter materials, thermal insulation materials, sanitary products, oil-absorbing materials and clean cloths (wiping cloths), battery separators, etc. It is widely used in medical and health care, automobile industry, filter materials, environmental protection, etc. And other fields.

melt-blown non-woven fabrics are mainly used as two-step SMS materials and medical and hygienic materials and coating materials. In addition, wipe and absorb materials, filtration and barrier materials are also melt-blown fabrics Important uses.

(1) Medical protection

Due to the high hydrostatic pressure resistance of the material of the meltblown cloth and the spunbond cloth, it has good air permeability and filtration effect, especially the material combined with the membrane has good barrier performance and filtration efficiency for non-oily particles Up to 99%.

For example, medical protective clothing made of composite materials with a quantitative specification of 60-100g / ㎡d can effectively block microorganisms, particles and fluids, and is very good for SARS virus (size 45nm) and HIV virus (size 90nm) Protective effect.

(2) Materials for air filtration

The melt-blown composite material subjected to electrostatic electret treatment has low initial resistance, large dust holding capacity, and high filtration efficiency when used in air filtration. [At a flow rate of 32L / min, the filtration efficiency of 0.3um particle size can reach 99.9 %, The resistance is only 117.7Pa (12mm water column)] and other characteristics, widely used in electronic manufacturing, food, materials, chemicals, airports, hotels and other places for air purification treatment.

Melt-blown non-woven fabrics are mainly used as composite materials, filter materials, thermal insulation materials, sanitary products, oil-absorbing materials and clean cloths (wiping cloths), battery separators, etc. It is widely used in medical and health care, automobile industry, filter materials, environmental protection, etc. And other fields.

2400mm meltnlown machinemelt blown method

(3) Materials for liquid filtration

The melt-blown nonwoven fabric can also be used as a liquid filter material, which can filter particles with a particle size of 0.22 ~ 10um. Such as bacteria, blood and large molecular substances. Mainly used in the filtration of photoresist in the electronics industry, the filtration of drugs, biological and synthetic plasma products in the pharmaceutical industry, the filtration of beverages, beer and Tang in the food industry, the fine filtration of electroplating solutions, the filtration of water purification in water plants, and the purification of tap water. Point-to-point hydrogen production unit, environmental wastewater filtration, etc.

(4) Insulation materials

The melt-blown non-woven fabric has the characteristics of large specific surface area, small void and high void ratio. For example, melt-blown non-woven fabric fibers with an average diameter of 3um [equivalent to an average fiber linear density of 0.0638dtex (denier of 0.058 denier)] have a variable area of ​​14617cm2 / g, and an average diameter of 15.3um [equivalent to an average fiber The specific surface area of ​​the spunbond nonwoven fabric fiber with a linear density of 1.65 dtex (fineness of 1.5 denier) is only 2883 cm2 / g.

Because the thermal conductivity of air is much smaller than that of ordinary fibers, the air in the pores of the melt-blown nonwoven fabric makes its thermal conductivity coefficient smaller, and the loss of heat conducted through the fiber material of the melt-blown nonwoven fabric is small, and The static air with countless ultra-fine fiber surface area prevents the heat exchange that occurs due to the air flow, so it has a good thermal insulation and thermal insulation effect.

Polypropylene (PP) fiber is the smallest thermal conductivity coefficient of the existing fiber materials, after special treatment [such as adding 35% high special (coarse) PET three-dimensional crimped fiber] made of PP fiber melt-blown thermal insulation flakes The thermal insulation performance is 1.5 times that of down and 15 times that of ordinary thermal cotton. Especially suitable for making ski wear, mountaineering wear, bedding, sleeping bag, thermal underwear, gloves and shoes. Products with a basis weight of 65 ~ 200g / m2 have been used to make warm clothing for soldiers in cold areas.

(5) Oil-absorbing materials

PP fiber has good hydrophobicity and lipophilicity, low density (0.91g / cm3), low water absorption rate (0.01%), moisture regain rate of 0.05%, and has stable chemical characteristics such as insoluble in oil and acid and alkali resistance. Very good oil-absorbing material. The melt-blown non-woven fabric produced from PP raw materials has an oil absorption of 15 to 17 times its own weight and a water absorption of 0.71 to 1 times its own weight. It has the characteristics of fast oil absorption, long-term floating on the water surface after oil absorption, and reusability. It is currently the most commonly used oil absorption material.

(6) Wiping and industrial materials

Meltblown cloth is also an excellent wiping material, which can be used to clean and wipe precision instruments and equipment, and can also be used as a wiping cloth for family life. In order to prevent the fibers from falling off during use and affecting the use, the low temperature hot rolling process is often used to increase the surface strength of the meltblown cloth.

Meltblown cloth is an excellent sound insulation and cushioning material, and is widely used in construction and automobile manufacturing.

3200mm meltblown production line 3200mm meltblown production line

The melt-blown non-woven fabric is a non-woven fabric manufactured by the melt-blown process, and also belongs to the product directly manufactured by the melt spinning process.

Second, the melt-blown non-woven production process

This process is still the mainstream production process widely used in the melt-blown nonwovens industry. It is characterized by a single row of spinnerets and drafting with hot air flow, which is blown out from both sides of the spinneret at an angle .

The melt-blown non-woven production process is to use high melt index (abbreviated as MFI) polymer chips, after extrusion heating, melting into a high-temperature melt with good flow properties, the use of high-temperature, high-speed hot air flow will spray The production process of the thin stream of melt sprayed from the silk plate is blown into very fine fibers, gathered into a fiber web on the receiving device (such as a net forming machine), and bonded to each other by its own residual heat.

The melt-blown method is currently an important process for manufacturing fine filter materials and materials with high barrier properties. It is also a method for manufacturing nanomaterials, and it is still a rapidly developing technology.

he first English letter of the melt-blown non-woven fabric process is “M”, so the melt-blown fabric also becomes the “M” cloth, and the melt-blown system is also simply referred to as the “M” system, sometimes also referred to as the “MB” system. Generally, the independent melt-blown nonwoven fabric production line has only one spinning system, and two or more melt-blown systems can also be configured in the production line according to market requirements to form an MM or MMM type production line.

In the SMS production line, the MB system is an important system, which has a great influence on the application performance of the product (breathability, barrier capacity). In order to improve the production capacity of the production line and the quality of the product, there will be multiple MB system.

The production process of the melt-blown non-woven fabric is: the polypropylene chip (FR400-1200) is melted by a screw extruder, and it is sprayed into a fibrous shape through a spinneret, and heated at a high speed (13000m / min) Under the blowing of the airflow, it is strongly stretched to form extremely thin short fibers. These short fibers are adsorbed on the net curtain. Because the fibers are condensed into a net, they can still maintain a high temperature, so that the fibers are mutually connected. The adhesion becomes a melt-blown nonwoven fabric, which is finally packaged in rolls.

2400mm meltnlown machine 3200mm meltblown production line

1. Screw extruder; 2. Metering pump; 3. Melt blowing device; 4. Receiving net; 5. Winding device; 6. Feeding device.

The equipment of the continuous production line of melt-blown nonwoven fabric is about 6m high, about 5m wide and about 20m long.The production equipment is as follows:

(1) Screw extruder: The screw diameter is generally 100 ~ 120mm, and the length / diameter ratio is 30. Its purpose is to melt the slice.

(2) Metering pump: Its function is to accurately measure and control the output and the fineness of the fiber. It is a gear pump that continuously delivers the melt to the spinneret.

(3) Melt filter: Its function is to filter out impurities in the melt, so as not to block the spinneret holes.

(4) Conveying net curtain: Spread the melt-blown fiber evenly on the net and convey it forward. There is a suction fan below it to discharge the hot air coming down.

(5) Spinning box: It is the key equipment of the melt-blowing process. There is a long-shaped spinneret plate, which is covered with a long row of spinneret holes. There are generally about 1500 nozzle holes per m length. Hot air nozzles are installed on both sides of the spinneret, and hot air nozzles are installed below it, forming a 50b angle with the nozzle holes. superfine fiber.

(6) Feeding system: It consists of three measuring hoppers, which are used to measure white slices, masterbatch, and additives. The three components enter the following mixer and mix evenly, that is, they are put into production.

(7) Hot air blower and heater: provide the temperature and pressure of the hot air used in the spinning air flow stretching, heated by electricity, and consume more electricity.

(8) The take-up machine adopts full-automatic take-up, and melt-blown cloth is packed into rolls. The fiber characteristics of the melt-blown nonwoven fabric are ultra-fine, and the fiber diameter can reach a minimum of 0.5Lm, generally between 1 and 5Lm. The finer the fiber, the better the quality of the meltblown cloth, but the output is relatively reduced. Due to ultra-fine fibers, large specific surface area and strong adsorption capacity, this is the most prominent advantage of melt-blown cloth.


Eternal Bliss Alloy Casting & Forging Co, Ltd.  melt blown method

Technical Dept.


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