Comprehensive Performance Test Of Wood Pulp Spunlaced Composite Nonwovens

< p > the first use of wood Spunlaced Composite Nonwovens is the wiping market; the second use is medical products; the third is the hygienic products.

In addition, the hygienic products made from wood Spunlaced compound process contain no chemical additives, have good skin tolerance, high strength and softness, and the process is environment-friendly and pollution-free.

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< p > < strong > experimental operation, the key data < /strong > /p >

< p > after opening and mixing, a uniform web is formed through carding.

After wetting, the mesh will enter the first spunlace area.

In the first Spunlaced area, a high pressure water column is used to puncture the running net.

In this process, a part of fibers are taken from the surface to the bottom of the net under the action of the high-pressure jet. Some of the fibers are sent back to the mesh curtain and are then returned to the surface of the fiber and the surrounding fibers. The fibers intertwined, so that the fibers can be consolidated and form a non-woven fabric with a certain intensity, that is, the web.

The strength of wood pulp is rapidly reduced, and the structure is loose, turning into wood pulp fiber.

Wood pulp fibers are injected into the fiber gap of the fiber net through the high-pressure water column to achieve the purpose of compounding with the mesh.

After the wood pulp paper is combined with the fiber net, it becomes a wood pulp composite spunlaced nonwovens after drying.

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< p > because there is no special company providing wood pulp compound Spunlaced production line, so now most of the post-processing lines are designed by the companies themselves.

The following is a brief sketch of the technological process of the wood pulp compound post-processing line designed by the engineer of Nan six (Pinghu) Co., Ltd.

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< p > < strong > raw materials and instruments < /strong > /p >

< p > < a href= "//www.sjfzxm.com/news/index_c.asp" > wood spunlaced nonwovens < /a > consists of wood pulp paper and PET.

The experimental wood pulp paper comes from NAN LIU ENTERPRISE COLTD, Spain, and PET is from Sinopec, Yizheng.

The wood pulp paper used in the experiment is 28g (the weight of wood pulp paper in the 48g wood pulp composite cloth is 28 grams, the other gram weight pulp paper weight is 38g) and 38g, and the wood pulp paper has 5 kinds of colors (white, blue, dark blue, green, dark green), and PET changes with the change of overall weight requirement.

The experimental equipment is mainly from the high-speed railway testing instrument (Dongguan) Co., Ltd. (high speed rail Co., Ltd. is the first manufacturer of test machines approved by ISO9001 in Asia).

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< p > < strong > water resistance test < /strong > < /p >

< p > < strong > water resistance test mainly includes water splashing test and spray test.

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< p > < strong > water splash test standard: AATCC/22-1996/JIS/L/1912 < /strong > /p >

< p > < strong > spray test test standard: AATCC/42 < /strong > /p >

< p > water splashing test: take a sample of 18cm * 18cm and carry out this test at 21 + 1 degrees.

Use the metal hoop with a diameter of 15.2cm to lay the sample flat and fix it on the inclined plane of the instrument, pour 250ml water into the funnel, the water temperature is controlled at 27 + 1 degrees, and the water impact time should be controlled within 25s~30s.

One end of the metal hoop is held in hand, and the other end is struck quickly on the solid plane. Then the cloth is compared with the standard view to determine the water splashing grade.

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< p > spray test method: the side of the sample is clamped on the spring clamp on the top of the inclined plane, weighing 152mm * 230mm standard absorbent paper, accurate to 0.1g, inserted into the bottom of the sample.

Pour 500 + 10ml, 27 + 1 C water into the funnel of the tester, and the water is sprayed onto the sample.

After the spray is finished, take the test sample and take out the absorbent paper. Then weigh it quickly and accurately to 0.1g. When the weight of the exudate water is <1g, it is qualified.

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< p > < strong > alcohol resistance test < /strong > < /p >

< p > because there is no corresponding test mark in China, so this experiment is based on the Japanese JIS/L/1912 test standard.

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< p > detection method: take 5 samples of 20cm * 20cm specification and place the sample on a smooth horizontal pparent glass plate or plastic plate.

Drop the droplet diameter of about 5mm on the sample with 3 drops.

After 5 minutes, observe whether the droplet penetrates through the nonwoven fabric.

If there is no penetration, test with alcohol until it is passed.

After 5 minutes, if the sample is not passed, the average sprinkling accuracy and the accuracy of each sprinkling can be calculated according to the highest number of sprinkling accuracy.

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< p > < strong > < a > href= > //www.sjfzxm.com/news/index_c.asp > > data analysis < /a > determine the best process < /strong > /p >

< p > alcohol resistance is an important indicator of medical gowns. The higher the anti alcohol ability, the better the quality and the better the safety of doctors.

In general, surgical clothing requires at least 7 levels of alcohol resistance.

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< p > according to the test results of Table 1, all test samples are fully up to the testing standard.

According to the data in Table 1, the post treated wood spunlaced nonwovens are generally 7~8 alcohol resistant, basically meeting the requirements of medical surgical suits against alcohol.

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< p > water resistance is also an important indicator for judging the performance of medical surgical clothing.

The stronger the ability to resist water, the stronger the ability to endure, the less likely it is to touch the water, and the more secure the doctor is.

Because doctors are easily infected with water and blood when they are doing surgery. These liquids may have harmful germs and threaten the health of medical workers. Therefore, the stronger the ability to resist water, the more conducive to doctors' life and health.

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< p > according to the test results of Table 2 and the comparison of Figure 1, it can be seen that all test cloth samples, whether water splashing or spray experiments, are fully up to the testing standard. From table 2, we can see that the splashing water of post treated wood Spunlaced cloth is generally 4, which basically meets the requirements of water splashing for medical surgical suits, and the test results of spray experiments are also between 0.2g~0.4g, which meet the requirements of standard range between 0.1g~0.5g.

When the test result is greater than 0.5g, a groove mark will be formed on the surface of the spunlaced composite nonwoven fabric, which will seriously affect the commercial value and wearability of the product.

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< p > the main factors affecting the permeability of spunlaced products are weight, structure and finishing process. From the comparison of Figure 2, it can be seen that the PT048W effect of wood pulp composite cloth permeability is best, because the weight of wood pulp paper in PT048W is only 28g, while the weight of wood pulp paper in other products is 38g, so its permeability is best. It can also be explained that the weight of wood pulp paper in the wood pulp composite cloth is bigger, and its air permeability is correspondingly worse.

Therefore, we need to continue to study, so that the permeability of wood pulp composite cloth can ensure that it is within reasonable limits even if the weight is increased.

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< p > disposable a href= "//www.sjfzxm.com/news/index_c.asp" > surgical gown < /a >, protective clothing is relatively demanding in medical industry.

In GB/T 3923.1-1997, the requirement for breaking strength of disposable protective clothing is relatively strict, that is, the requirement for 45N is above.

However, the performance of wood pulp composite fabric will be different in all directions, CD strength is usually lower, and the probability of being pulled off in actual use is even greater.

Therefore, it is important to refer to the test results of CD fracture strength when breaking strength.

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< p > we tested the softness of wood pulp composite fabric as an index.

From the comparison between table 3 and figure 3, we can see that the softness of PT048W is the best (the smaller the MD, the smaller the CD, the better the softness), because the minimum weight of wood pulp paper is, and the weight of PET layer is the smallest when the weight of wood pulp paper is the same. The better the softness, the better because the wood pulp paper itself has the characteristics of paper - hard, while the PET fiber is softer, so the lower the proportion of wood pulp paper in the wood pulp composite fabric, the better its softness.

However, in order to ensure the other characteristics of the surgical clothing, we can not make the proportion of wood pulp paper in the wood pulp composite cloth too low. This is also a subject we can study in the future.

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