Related Knowledge Of Needling Machine Selection

In recent years, needle punched nonwoven industry has developed rapidly.

Needle punching process has the advantages of short production process, strong adaptability to raw materials and less investment in initial stage. Therefore, the proportion of needling process line in nonwoven production line is bigger and bigger.

The "Technology Forum" introduces this issue.

The related knowledge of selection is expected to inspire readers.

In the process of nonwoven production, it is a key issue to produce a high-quality and reasonable needle punched nonwovens production line in order to make the needle punched nonwoven material with excellent physical and mechanical properties, high added value and great market competitiveness.

Needle punching machine is the core equipment of needle punched nonwovens production line. Generally, a needle punched needle machine and several main needle punching machines are commonly used in a needle punched nonwoven material production line. Some production lines also include the needle punching machine.

Special needling machines such as shaving needling machines and so on, which are used to change the appearance of needled nonwoven materials and enhance the added value of products.

Whether the performance of the needle punching machine is good or not, whether it is reasonable or not is the premise of obtaining good products, and directly determines the performance indexes of the final product.

Therefore, needle punched nonwovens are being deployed.

In the production line, the scientific selection of needling machine is particularly important.

Selection of needle movement based on product surface density

The movement of acupuncture is the maximum displacement of the needle at the highest point to the lowest point, and its value is two times that of the crankshaft eccentricity. It is a very important parameter of the needle punching machine.

The needle punching machine is generally equipped with 40~60 millimeter, and 65 mm, 70 mm, 75 mm, etc., which is mainly configured according to the surface density of the final product.

Products with low surface density (less than 1000 grams / square meter), the needle punching machine can be selected for a small number of needles, and the average stroke time of the conventional models is 50~60 mm.

For the production of high surface density (1000~2000 g / m2) products, the needle movement range is 70 mm or 75 mm, for example, the needle movement of ceramic fiber needling machine is 70 mm.

For special products, the movement of acupuncture can be even more configured.

When the product surface density reaches 1000~2000 grams / square meter, the needle punching machine has great force, that is, the impact force of the machine is great, and the machine vibration is also very strong. At this time, not only the needling process of the needle punching machine should be considered larger, but also the heavy needle punching machine with lower needle punching frequency and more firm, larger rack iron plate and thicker spindle should be selected to reduce the vibration of the machine and maintain the stability of the needle machine.

The main needle stab machine is generally small in 30~40, and most needle punching machines use 38 millimeter needles.

Selection of needle density according to type and product selection

Planting density refers to the number of needles distributed on the length of the needle plate along the width of 1 meters, the unit is a / M.

When the net enters the pre pricking needling machine, it is in a very loose state. The thickness of the mesh is large, and the force between the fibers is very small. The structure of the web is easy to be damaged in the process of reinforcement.

Therefore, the needle density of pre pricking needling machine is low, generally 3000~5000 / M.

The main needling machine is generally equipped with 4000~8000 / m, while the double needle punching machine reaches 8000~16000 / M.

The shaving needle machine is generally configured as the last needle, which is used to remove the needle marks on the surface of needled nonwoven materials. Therefore, the needles used should be relatively thin, needling depth should be shallow, planting needle density should be higher, and the general single needle plate should be 6500~7000 / M.

The production of glass fiber and waste fiber needle punched nonwovens generally has a needle density of 3000~4000 M / m. The general density of the geotextiles is 4000~6000 M / m. The production of leather base cloth is generally higher than that of 6000~8000 / m, and the needle punching and nonwoven material is 6000 / m.

Needle selection based on raw material density and product selection.

Needles are the final components of acupuncture. The selection of needles is very critical. Generally, the needle number and needle shape of needles should be considered.

The needle includes three parts: needle, needle waist and needle handle. The thickness of the three part is expressed by needle number, needle waist number and needle handle number respectively.

The needle number often mentioned in production refers to the coniferous number. The larger the needle number, the smaller the needles, the lower the intensity of the needles, the easier to break the needles when processing.

The generally seen needle number is 36~42, the height of needle 36 is 0.58 mm, and the height of needle 42 is 0.43 mm.

The selection of needle number is closely related to the density of fiber used in production. For example, when using 0.1~1.5 tex tex fiber material, 42 needle is usually selected.

When 6~10 is used to separate tex tex fiber material, needle No. 38 is usually selected.

When using 18~30 to divide the coarse and fine fiber raw materials, the 36~32 needle is generally used.

When more than 30 points of Tex's fiber material is used, 30 or even thicker needles can be used.

When several needle punching machines form needle production lines, in order to reduce the needle marks on the surface of needles, the general principle of selecting needle pins is "thin coarse coarse".

That is to say, the selection of the needle number of the needling machine can be slightly larger so that the mesh can be compressed and reinforced under the action of a more relaxed needle.

The main thorn needling machine selects the needles in the order of "coarse and thin" in order to reduce needle marks on the surface of needled nonwoven materials.

According to the cross sectional shape of conifers, common needle needles are triangular needles, fork shaped needles, cross star needles, tapered needles and water drop shaped needles.

The choice of needle shape is related to the type of product produced. For example, when producing needle punched nonwoven material, pattern and Terry needle punched nonwoven material, the needle punching machine uses fork shaped needles. When producing organic fabric reinforced paper blankets and filtering needle punched nonwovens, water drop shaped needles can be used to lighten the damage to woven fabric reinforced materials.

Triangular needles are the most widely used needles, which can be used when producing most needle punched nonwoven materials.

The cone shaped needle is more powerful than the triangle needle with the same needle number, and it is not easy to break the needle, so it can be used in producing waste needled nonwoven material.

Optimizing the width of needle punching machine and reducing the cost

The width of the needle punching machine is generally 2.5~2.8 m, 3.6 m and 4.5 m. The needle punching machine used for producing geotextile needle nonwoven material is wide in width, and some can reach 10 m or larger width.

Because the spindle box needle punching machine adopts the imitation Fehrer company's spindle box body structure, is restricted by the headstock box size, the single box body is generally 1.1~1.4 meters.

Generally, the 2~4 box is used. The width of the needle punching machine is 2.2~5.6 meters, and the needle punching machine with 6~8 box can be more than 10 meters wide.

The width of the needling machine is directly related to the selling price of the needle punching machine. Generally speaking, the price of the needle punching machine is about 40 thousand yuan per meter, and the middle speed needling machine is about 9.5~10 yuan / m, and the high-speed needle punching machine is about 120 thousand yuan / meter.

The wider the width, the higher the price of the needle punching machine.

At the same time, there is another factor that must be considered. That is, with the increase of the number of needled webs, the width of the mesh will shrink. The smaller the fibers, the more serious the shrinkage will be.

For example, when the 3D fiber is used for production, the width of the net is 3.6 meters when feeding into the pre pricking needle machine. After the needling needle punched machine and four main needling needling machines, the mesh can be contracted to 3.1 meters.

After taking full account of the shrinkage effect of the width of the mesh, the needle punching machine with lower width can be configured in turn when the needle punching machine is configured, so that the cost of the equipment can be effectively reduced.

If the high-speed needle punching machine with a width of 3.6 meters is changed into a high-speed needle punching machine with a width of 3.1 meters, then only one needle punching machine can save about 60 thousand yuan.

It can be seen that taking into account the factors of width shrinkage is immediate for enterprises to reduce equipment costs.

Reasonable selection of needling machine is prerequisite.

For a needle production line, it is very important to select the needle punching machine scientifically and reasonably.

As mentioned above, when the fluffy net enters the needling machine, the structure of the web is easy to be damaged, and it is easy to cause the gap between the net and the net plate, and the situation that the net can not pass smoothly.

Therefore, it is a prerequisite for whether the needle punching machine can produce the stable web structure and fiber quality distribution evenly, whether the product can be carried out smoothly and whether the product is qualified.

There are two kinds of pricking needles, which are downward needling and upward spines, usually using downward stabbing machines, and a few enterprises use upward punching models.

The upward spines are mainly used when producing low surface density products.

When using the upward stabbing machine, the fiber net is needled upward from the bottom, so the net will vibrate with the needle closer to the top supporting plate, and with the action of the needles between the supporting plate and the peeling net. This will help the net pass smoothly through the needle punching machine.

If the downward stab machine is used, the net will be tightly attached to the underside of the supporting net plate under the action of the needle, and the fiber net is not easy to move forward, resulting in the blockage of the fiber net, thus affecting the smooth progress of production.

In the selection of needle punching machines, needle punching machines should be selected scientifically and reasonably.

This is not only conducive to reducing the cost of enterprises, but also directly related to whether the production line can be successfully put into production, and whether it can produce quality products.