E-Glass Fiber Glass Cloth

In recent years, fiber glass strand and its products falling prices, and raw material prices rising, prices had a great influence on the rising cost of energy. How in the presence of these unfavorable factors to reduce costs, improve efficiency becomes the key to glass fiber enterprise survival and development.

Soakage agent cost holds a large proportion in glass fiber production, how to reduce soakage agent consumption in production, improve the utilization efficiency of soakage agent, become the urgent matter. Reduced consumption, the first should be thoroughly analyzes the influential elements of the soakage agent consumption, to adopt technology reform, actively adopt new technology, new technology of saving energy and reducing consumption, radically reduce the consumption of raw materials, in achieve the goal of product quality at the same time, ensure the realization of the cost control target.

The utilization of soakage agent
The concept of utilization
Soakage agent utilization is ratio that soakage agent content coated by glass fiber strand and consume total of soakage agent by producing these strands. Form (1) said:

In the form
C0 —the utilization of soakage agent，%；
C1 —the strand combustible content，%；
C2 —the solid content of water soakage agent，%；
M1 —the strand weight，kg；
M2 —weight for water soakage agent consumption，kg。

The influencing factors of utilization

In production, there are many factors that can affect water soakage agent consumption, among various factors are inextricably linked. Below factors influence the utilization ratio of soakage agent in production of a detailed analysis.

Production factors
Different and the same variety in different yield and other factors unchanged, under the condition of soakage agent utilization statistics are shown in table 1, the relationship between yield and utilization ratio is shown in figure 1.
Table 1 utilization statistics of soakage agent

Figure 1 relationship between output and utilization

You can see through the table 1 and figure 1, at the time of production is not particularly small, utilization rate basically stable, but the yield is too small, soakage agent utilization rate is relatively low, this is because the first production, soakage agent in circulating water system loss relative to the total soakage agent consumption is too large, lead to formula in M2 artificially high, cause soakage agent utilization is too low.

Strand combustible content and factor of soakage water solid content
Both strand combustible content and the solid content of water soakage agent has a very close relationship with Soakage agent utilization, a separate analysis could not realize, so the unified consideration of both.

When a certain solid content, in order to ensure sufficient combustible content in the coating rate, under the condition of the same homework (test is to use oil speed to achieve improved), coated strand on the number of soakage agent content after reaching a certain value, the strand combustible content will have a limit value, at this time no matter what the strand wire coating soakage agent content increase, combustible content is close to the limit, as shown in figure 2.

Figure 2 oil change curve
Visible, the demand of the strand combustible content is higher, but solid content is low, so, in order to ensure that the strand combustible content in the qualified range, only improve the oil linear velocity, and thus brings more problems, the soakage agent utilization reduce, under the condition of limit utilization rate is almost zero.

Strand can touch of the soakage agent + water quantity is certain, when stained with overburden amount reach saturation, more stained by strand agent will be replaced by water, resulting in the loss of soakage agents, reducing the efficiency of soakage agent.

When solids have been able to meet the requirements of the strand combustible content, while the strand combustible content in certain, the relationship between how much of solid content and the utilization of discretion is shown in figure 3.

Figure 3 the relationship between solid content and utilization

You can see from figure 3, solid content is low, utilization rate is higher. Therefore, strand combustible content and solid content must be in appropriate range, soakage agent utilization can reach ideal level.

Weight for water infiltration agent consumption
This is the result of joint action of many factors, in production, combustible content, solid content under the condition of relatively stable, glass fiber production field control level and the waste water soakage agent determines the soakage water consumption of the weight of high or low, relatively stable production and the sustainability of the single variety, to reduce the waste of water soakage agent weight has obvious effect.

Greased speed range of manufacturing has a large span (the same variety, same flow, oil frequency can differ 9), but oil frequency reach a certain extent, oil will not significantly change, frequency of oil gap among different cameras. Spray quantity is big, the position of the strand bunches drip down, in the drawing line the agent thrown around a lot, you can see through the table 2 and figure 4 wire drawing parameters right or not affect soakage agent consumption.
Table 2 Drawing on soakage agent consumption statistics

Figure 4 loss ratio

To improve these problems, the consumption of water soakage agent will reduce a lot, to improve the utilization rate of soakage agent has very great help.

Conclusion
To sum up, the utilization ratio of soakage agent is the result of the interaction of various factors, the stability of the production is the basis of the various discussions, and production control level also plays a very important role in it. Strand combustible content and solid content of high or low must be in the proper range, within the scope of the soakage agent utilization can reach ideal level.

Electronic Fiberglass Cloth (hereinafter referred to as e-glass fiber cloth ) usually made up of warp and weft yarns composed of a plurality of filaments.To meet the rapid development of the electronics industry, CCL enterprises require e-glass fiber cloth warp and weft single fiber can be spread evenly, forming flat, known as the “open fiber.”through the opening treatment e-glass fiber cloth can improve the resin impregnation, thereby improving the peel strength of copper clad laminate and circuit board drilling processability. The general opening of e-glass fiber cloth usually using three ways for fiber open ,such as high-pressure spunlaced fiber, roller open and high-pressure water spray,As the former huge investment, usually e-glass fiber cloth production plant using the latter two open fiber way. Roller opening technology and High Pressure Water Spraying Technology.

Contrast of Two Kinds of Opening

Roll open and high-pressure water spray fiber effect comparison in Table 4.
Table 4 is the pass rate comparison of 7628 e-glass fiber cloth in the two open-fiber way.

seen from Table 4, under the same air permeability standards, the high-pressure water-jetting of the e-glass fiber cloth,the greater the pass rate than the open-roll, so under the correct choice of the nozzle type, jet height and the injection pressure, the high pressure Water sprayed fiber way has a better opening fiber effect than the open-roll fiber.

Conclusion
The flattening(open fiber) of e-glass fiber cloth has become a must be in production process . In this paper, through the comparison of the principle and application about the two methods of open fiber analysis and analysis of the fiber technology to improve, I believe that high-pressure water spray open fiber way has a better effect than the open-fiber roller, which provides a more comprehensive guide on improve the e-glass fiber cloth opening technology.

Working Principle

High-pressure water jet fiber technology works shown in Figure 2. e-glass fiber cloth through a number of guide rollers composed of the opening machine, through the high-pressure pump and nozzle, the high-pressure water (soft water) sprayed on the front and back of e-glass fiber cloth, there is a adjustable plate in the bottom , so that e-glass fiber cloth weft and warp yarn fibers can uniformly dispersed.

Figure 2 high-pressure water jet fiber works
Through the circulating pump, two filtration system, storage tank (plus pay), water tank to form a soft water circulation system. To ensure that the circulating soft water to achieve a dynamic balance, circulating water pump driven by the inverter motor. Work should always observe the two filter system pressure, once the filter bag, to clean up in time to prevent soft water overflow.

The selection of technical parameters
The open fiber effects of the e-glass fiber cloth depends on the high-pressure pump outlet pressure, nozzle type and nozzle-to-cloth distance. Different types of fiberglass fabrics, the choice of the parameters are also different. Usually the thinner the e-glass fiber cloth, the lower the pump pressure, the smaller the nozzle flow, the nozzle to the cloth spacing to be large, it is necessary to ensure adequate open fiber, but also can not produce water stains in the fabric.

Nozzle selection and distribution
Nozzle angle
Nozzle angle and the jet height and the relationship between the spray shown in Figure 3 and Table 2.

Figure 3 The relationship between the nozzle angle or the jet height and the spray
Table 2 Spray data records at different spray heights at different spray angles

From Figure 3 and Table 2 we can see the relationship between the spray angle, jet height and the spray. Taking into account the need to open a larger jet force, the general choice of spray angle is 65 ° ~ 80 °, the spray height is range from 70 ~ 100 mm, spray overlap is range from 1/4 spray from the above data can be roughly determined between the nozzle distance.

Nozzle pressure
The relationship between the ejection force , nozzle pressure and ejection height is shown in Fig.4
As is clear from Fig. 4, the ejection force is inversely proportional to the ejection height and proportional to the nozzle pressure. After the test contrast, the nozzle pressure with 7628 cloth is 3 ~ 5 MPa , the nozzle pressure with the thinner fiberglass cloth is 1 ~ 3 MPa.

Nozzle flow
Nozzle manufacturers generally will provide nozzle flow and pressure table, if the selection of data beyond the scope of the table can be calculated using the following formula.

Figure 4, the relationship between injection pressure, jet force and jet height

Among them

Qx ——the selection of the nozzle flow，l/min;
px ——the pressure of the nozzle flow，MPa;
Q———the nozzle flow rates on the table，l/min;
p——the nozzle pressure on the table，MPa。

Usually a single nozzle flow rate is 200 ~ 300l / min of the e-glass fiber cloth with width 1270mm,In the high-pressure, the soft water in the nozzle with a high-speed flow, especially after the soft water recycling, which inevitably mixed with glass fiber impurities, so that the nozzle mouth wear increased, so the opening nozzle materials are creamic, its service life is 20 to 30 times than stainless steel .

Water spray open fiber results
The air permeability data of the 7628 e-glass fiber cloth measured by the water spray open showed in Table 3
The air permeability data of the e-glass fiber cloth measured by the high-pressure water sprayed open showed in table 3

Working principle
The e-glass fiber cloth is wrapped on the perforated roller by the front and rear tension rollers, and the plum roller concentric with the perforated roller is driven by the variable frequency motor. The device is placed in a water filled water tank. when equipment operation, Plum roller vibration generated by the water roller through the porous roller to the fiberglass cloth, so that the e-glass fiber cloth warp and weft fibers to disperse, to achieve the purpose of opening.

Figure 1 roller open fiber works
Theoretical analysis
According to the forced vibration system with damping formula

In the formula:
y———Vibration displacement，mm;
A———amplitude，mm;
ω———Angular velocity，rad /s;
t———Phase angle, mm /s
u———Vibration velocity，mm /s

According to the vibration mechanical wave principle

In the formula:
I———The average energy density is the wave vibration intensity，w /m2;
ρ———Medium density，g /cm3
Substituting (1) into (2) yields

From (3), the vibration intensity of the wave is proportional to the cube of the rotational speed and amplitude. Because the effect of opening the fiber is proportional to the vibration intensity of the wave, that is to say, increasing the rotational speed, increasing the petal number of the plum roller or increasing the petal will increase the vibration intensity of the wave. But the speed and the number of petals and the size of the increase to consider the e-glass fiber cloth fiber strength, that is, open fiber can not cause hairiness and weft oblique, hairiness and latitude to ensure control in the allowable range, select the appropriate speed and plum roller.

Open process
Open the process of fiber should pay attention to the following questions:
The speed of the perforated roller driven by the servo motor (see Fig. 1) should be synchronized with the master. To ensure fabric tension, the servo motor speed can be set on the touch screen by the manual adjustment.
In order to prevent the water wave oscillation so that the cloth from the porous roller, you can add a roller in the roller (see Figure 1), the gap between the porous roller and the pressure roller can be adjustable.
In consideration of the e-glass fiber cloth opening process with hairiness and weft obliquity, we adopt thirty-two petals roller, and then according to the variety of cloth and yarn source, select the plum roller speed, usually thin cloth is 200 ~ 400 r / m, thick cloth is 400 ~ 500 r / m.

Open fiber effect
The air permeability of the e-glass fiber cloth directly reflects the effect of the fiber opening. The air permeability of the unopened 7628 e-glass fiber cloth is generally 6-8 cm / s, and the air permeability of the 7628 e-glass fiber cloth after the roller is opened is less than 3 cm / s . Respectively, take the width of e-glass fiber cloth on the left, middle and right part of the three samples measured permeability, measured in Table 1.
Table 1 the air permeability after the opening of the fiberglass roller cloth