TWI384100B - Rubbing cloth and rubbing apparatus utilizing the same - Google Patents

Description

Alignment cloth and alignment device

The present invention relates to an alignment process for liquid crystal displays, and more particularly to its alignment fabric structure.

In the manufacture of a liquid crystal panel, the step of forming an alignment film by a brushing process is one of the important keys. If the brushing process is not ideal, it will cause static electricity accumulation and adhesion of particles to the alignment film. In order to solve the above problems, many manufacturers have proposed methods for improvement over the years, such as changing the composition of the alignment cloth and the like. For example, in the Republic of China Patent Application No. 93113630, an alignment cloth is formed by a method of rayon. However, the rayon of the above method easily accumulates static electricity during the brushing process, and thus cannot effectively improve the problem that the particles adhere to the alignment cloth. Although the cotton yarn material can reduce the problem of static electricity accumulation, it is impossible to tilt the pile of the pile by hot pressing or the like like artificial fibers. As a result, it is inevitable that a polymer material such as a resin is adhered to the pile portion, and then a subsequent hot pressing step is performed. However, in this method, the polymer particles are easily formed from the pile during the brushing process and adhere to the alignment film, deteriorating the quality of the product.

In order to improve the problem that the alignment of the cotton yarn can not be self-tilting, in the current Japanese supply of goods, there are cotton yarn as the warp and weft of the plush and the base fabric, and the warp and weft yarn structure and the yarn tension are adjusted in the weaving. The tuft of the plush pile is parallel to the warp. However, as the size of the liquid crystal display substrate continues to increase, this practice requires an increasingly large textile machine and corresponding plant space, and thus cannot meet the needs of large-size and six-generation panel manufacturers.

In summary, the currently needed alignment fabric structure makes the cotton yarn piles self-dumping. It is inclined, and there is no need to change the existing textile machine to solve the problem that the prior art cannot be applied to the alignment device of the large-sized panel factory.

The invention provides an alignment cloth, which is a cotton lint cloth, which is composed of a base fabric and a pile; wherein the base fabric component comprises cotton or rayon, which is woven by warp and weft, and the ratio of the diameter of the weft to the warp yarn is between 1:0.8. Between 1:0.95; and the composition of the plush is cotton combed yarn, the ratio of the diameter of the plush to the warp yarn is between 1:0.75 and 1:0.95, and the direction of the pile of the pile is substantially parallel The weft yarn.

The invention also provides an alignment device comprising a carrying platform; a drum disposed above the carrying platform; and the alignment cloth covering the surface of the drum; wherein the warp of the matching cloth is parallel to the central axis of the drum, and the inclined direction of the pile is substantially vertical The center axis of the drum.

As shown in Fig. 1, a schematic view of the alignment cloth 10 includes a base fabric 100 and a pile 11 woven from warp yarns 13 and weft yarns 15. The weave shown in Fig. 1 is a so-called velvet velvet, and the pile 11 is woven into the base fabric 11 via needle gold, and then cut by a cutting blade to form a V-shaped pile. The width W of the above-mentioned alignment cloth is limited by the textile machine, and it is known that the maximum width of the velvet fabric woven by the textile machine is 152 cm. The theoretical value of the length L of the alignment cloth is infinite, depending on the length of the warp yarn 13 and the yarn breakage. In an embodiment of the invention, the length of L can be as high as 2500 cm or more.

The above-mentioned pile 11 is a cotton combed yarn, and the warp yarn 13 and the weft yarn 15 of the base fabric 100 may be cotton, rayon, or a mixture thereof. Since the alignment effect of the alignment cloth 10 depends on the thickness, inclination angle, and density of the pile 11 Therefore, the present invention adjusts the parameters of the warp yarn 13 and the weft yarn 15 with the pile 11 as a reference. In an embodiment of the invention, the density of the pile 11 is between about 1600 and 3,800 per square inch. If the pile density is too high, the force of the brush substrate is too strong to scratch the substrate. If the pile density is too low, the force of the brush substrate is insufficient, and the alignment cannot be produced. In an embodiment of the invention, the pile 11 has a diameter between 0.17 mm and 0.22 mm. If the diameter of the pile 11 is too small, the strength of the yarn is insufficient to cause yarn breakage. If the diameter of the pile 11 is too thick, the same phenomenon as the pile density is too high. The above-mentioned plush cotton fiber has a micronaire of between 3.5 and 4.2. If the fiber micronaire is too fine, the fiber rigidity is insufficient. If the fiber fineness is too coarse, the fiber rigidity is too large. The above-mentioned plush 11 can be the Taiyuan Textile New Paradise brand GOM-9445KT batch number cotton yarn.

Since the diameter of the warp yarn 13 is smaller than the diameter of the weft yarn 15, it is possible to provide the pile of the pile 11 with a stress inclined by 5 to 40 degrees in the y direction shown in Fig. 1. When the diameter of the warp yarn 13 is finer, the inclination angle of the pile 11 is larger. It must be noted here that although the diameter of the warp yarn 13 is larger than the diameter of the weft yarn 15, the pile of the pile 11 is inclined in the opposite direction (-y), but increasing the diameter of the warp yarn 13 will cause the unit The number of warp yarns 13 in the area is reduced. As a result, the number of piles 11 per unit area is also reduced, which does not correspond to the desired pile density of the alignment cloth. In an embodiment of the invention, the warp yarn 13 has a density of between about 45 and 50 per inch. If the warp density is too high, the pile density is increased, and the force of the brush substrate is too strong. If the warp density is too low, the pile density is lowered, resulting in insufficient force on the brush substrate.

In order to make the direction of the pile of the pile 11 parallel to the weft yarn 15 (y-square The ratio of the diameter of the weft yarn 15 to the warp yarn 13 is between 1:0.8 and 1:0.95. If the diameter of the warp yarn 13 is too small, the strength of the warp yarn is insufficient, and weaving yarn breakage is liable to occur. If the diameter of the warp yarn 13 is too thick, the angle of inclination of the pile 11 is insufficient, and the alignment cannot be effectively performed. Further, the warp yarn 13 is preferably between 0.17 mm and 0.22 mm in diameter, and has a single yarn strength ranging from 480 CN to 820 CN. If the strength of the single yarn is too high, the spinning technology cannot be produced. If the strength of the single yarn is too low, the weaving process is easy to break the yarn and cause the crepe. The above warp yarn 13 may be a Taiyuan New Paradise brand GOM-8973KR batch number or a GOM-9430KT batch number combed cotton yarn.

In the above embodiment, the weft yarn 15 and the pile 11 have the same thickness, fiber length, and number of fiber strands. Further, the weft yarn 15 has a density of between 80 and 96 pieces/inch. If the density of the weft yarn 15 is too high, weaving is difficult. If the density of the weft yarn 15 is too low, the loose grip of the cloth structure is insufficient. When the parameters of the weft yarn 15 and the diameter of the pile 11 are the same, the piles of all the piles 11 are only y in the oblique direction in Fig. 1 and are not biased toward the x or -x direction.

In another embodiment of the invention, the weft yarn 15 is different in diameter from the pile 11 and the diameter ratio of the diameter of the pile 11 to the weft yarn 15 is between 1:0.75 and 1:1.3. In this way, the direction of the pile of the pile 11 is y vector plus x vector or y vector plus -x vector. In general, the pile of the pile 11 is inclined toward the x or -x vector by an angle of more than 75 degrees from the horizontal plane.

The second figure is another alignment cloth 20, and also includes a base fabric 200 and a pile 21. The base fabric 200 is composed of warp yarns 23 and weft yarns 25, and the direction of inclination (y) of the piles of the piles 21 is substantially parallel to the weft yarns 25. To achieve the above object, the diameter of the warp yarn 23 is smaller than the diameter of the weft yarn 25, and the range is similar to the foregoing. In addition, the diameter of the weft yarn 25 can be adjusted so that the direction of the pile of the pile 21 is inclined. The y vector plus the x or -x vector is the alignment cloth 10. In fact, the difference between the alignment cloth 20 and the alignment cloth 10 is only that the cutting blade cuts the pile 21 a long distance, that is, a so-called W-shaped pile. The parameters such as the diameter ratio of the remaining pile 21 to the warp yarn 23 or the weft yarn 25 are similar to those of the alignment sheet 10 of Fig. 1.

The alignment cloths 10 and 20 can be further subjected to mercerizing treatment, which can reduce the problem of static electricity accumulation during the brushing process. Regarding the detailed steps and effects of the mercerizing treatment, reference may be made to the Taiwanese application (TW98137189) proposed by the inventors of the present invention.

Next, for convenience of description, only the alignment cloth 10 will be described. However, it will be appreciated that the alignment cloth 20 achieves a similar effect. As shown in Fig. 3, the alignment cloth 10 is cut and the roll 31 is covered to polish the liquid crystal panel 35 containing the alignment film on the carrier base 37. In Fig. 3, the oblique direction (arrow) of the pile 11 is perpendicular to the central axis 33 of the drum 31. It will be appreciated that as the area of the panel 35 continues to increase, the length RL of the drum 31 used in the alignment process will also increase. Since the inclined direction of the pile of the alignment cloth 11 of the present invention is parallel to the weft yarn 15, the drum 31 can be covered as long as the length L of the alignment cloth 11 is larger than the length RL of the drum 31. Compared with the conventional technique in which the direction of inclination of the pile is parallel to the warp yarn, the width W of the alignment cloth of the present invention conforms to the circumferential length 2πr of the drum 31, and it is not necessary to use a large-sized textile machine of high price.

To further illustrate the benefits of the present invention, please refer to the comparison of Figures 4A and 4B. Fig. 4A is an alignment cloth 10 of the present invention, in which the pile direction of the pile (the arrow shown) is substantially parallel to the weft yarn. In the case where the width W' of the conventional textile machine table 41 is fixed, the width W of the alignment cloth of the present invention is necessarily equal to or less than the width W' of the textile machine 41, but may be theoretically unlimited. Length L. Thus, regardless of the size of the panel 35 of Fig. 3, the length RL of the drum 31 is long, and the alignment cloth 10 of the present invention can be fitted without the need to change the textile machine of a larger width W'. However, in Fig. 4B, in the prior art alignment cloth 40, the pile direction of the pile is parallel to the warp yarn. As a result, when the panel size becomes large and the RL of the alignment roller 31 becomes long, it is necessary to use the textile machine 41 having a larger width W', while requiring a larger plant and higher cost. Compared with the prior art, the alignment cloth of the present invention does not need to change the textile machine, and only needs to adjust the ratio of the diameter of the warp and the weft to the plush, so that the inclined direction of the pile is parallel to the weft, and is suitable for all lengths. Alignment roller. Furthermore, the fleece head of the present invention is composed entirely of cotton yarn and does not have any rayon. Compared with the conventional technique of using rayon by heat setting, the alignment cloth of the present invention has less static electricity accumulation, is less likely to generate particles, and reduces the quality of the brushed product.

The above and other objects, features, and advantages of the present invention will become more apparent and understood.

[Examples] Example 1

Take 60/2' ^S (model GOM-9430KT) combed cotton yarn as warp yarn and 40/2' ^S combed cotton yarn as weft yarn, woven with dense 47 pieces/inch and weft density 96 pieces/inch velvet weave After the base fabric, the pile (40/2' ^S combed cotton yarn) was woven into the base fabric with needle gold and cut to form a V-shaped pile. The diameter of the plush and the weft are the same, and the ratio of the diameter of the weft to the warp is 1:0.82. The warp length (L) of the above-mentioned alignment cloth is 3000 cm, and the length of the weft width (W) is 150 cm, and the inclination direction of the pile of the pile is parallel to the weft yarn, and the angle of the inclination angle to the horizontal plane in the y direction is less than 70 degrees. As shown in Figure 5A. The alignment cloth was then cut into 40.7 cm * 137 cm to fit the drum size (circumference 40.7 cm, length 137 cm). The alignment cloth is applied to the drum so that the warp yarn of the matching cloth is parallel to the central axis of the drum, and the inclined direction of the fleece head of the matching cloth is perpendicular to the central axis of the drum. Then, a liquid crystal panel containing an alignment film (PI) of 68 cm*88 cm was brushed by the above-mentioned roller coated with the alignment cloth, and the brushing process was completed.

Example 2

Take 50/2' ^S (model GOM-9588-KT) combed cotton yarn as warp yarn and 36/2'S combed cotton yarn as weft yarn, woven with dense 47 pieces/inch and weft density 96 pieces/inch velvet weave After the base fabric, the pile (40/2' ^S combed cotton yarn) was woven into the base fabric with needle gold and cut to form a V-shaped pile. The pile is thicker than the warp yarn, and the weft yarn is thicker than the warp yarn, wherein the ratio of the diameter of the weft yarn to the warp yarn is 1:0.935, and the ratio of the diameter of the pile to the warp yarn is 1:0.89. The warp length (L) of the above-mentioned alignment cloth is 3000 cm, and the length of the weft width (W) is 150 cm, and the inclination direction of the pile of the pile is parallel to the weft yarn, and the angle of the inclination angle to the horizontal plane in the y direction is less than 70 degrees. As shown in Figure 5B. The alignment cloth was then cut into 40.7 cm * 137 cm to fit the drum size (circumference 40.7 cm, length 137 cm). The alignment cloth is applied to the drum so that the warp yarn of the matching cloth is parallel to the central axis of the drum, and the inclined direction of the fleece head of the matching cloth is perpendicular to the central axis of the drum. Then, a liquid crystal panel containing an alignment film (PI) of 68 cm*88 cm was brushed by the above-mentioned roller coated with the alignment cloth, and the brushing process was completed.

Comparative example 1

Take the commercially available imported Indian or Pakistani 40/2' ^S combed cotton yarn as warp and weft, and weave it into a base fabric with a density of 47 pieces/inch and a weft density of 96 pieces/inch velvet. Velvet (40/2' ^S generally combed cotton yarn) is woven into the base fabric and cut to form a V-shaped pile. The plush, warp, and weft yarns have the same diameter. The warp length of the velvet cloth is 3000 cm, and the length of the weft width (W) is 150 cm, and the pile of the pile is not inclined as shown in FIG. 5C, so the straight warp can not be cut as the matching cloth. .

Comparative example 2

Commercially imported Indian or Pakistani 60/2' ^S combed cotton yarn is used as the warp yarn and the commercially available 40/2' ^S combed cotton yarn as the weft yarn, which is woven into the base fabric by velvet weaving. However, the above-mentioned base fabric is liable to cause a yarn breakage problem at a time when the warp length is 200 cm, and it is not applicable to the drum described in Embodiment 1. From the above, it can be seen that if the fiber length of the warp yarn is too short, the fine warp yarn cannot have sufficient supporting strength to form a long alignment cloth. As a result, the warp length L of the alignment cloth cannot conform to the length RL of the drum, and it is difficult to apply to the alignment process.

While the invention has been described above in terms of several preferred embodiments, it is not intended to limit the invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

r‧‧‧Roller radius

2πr‧‧‧roller circumference

W‧‧‧ Alignment latitude width

W’‧‧·Textile machine width

L‧‧‧ alignment cloth warp length

RL‧‧‧Roll length

↑‧‧‧ Plush pile tilt direction

10, 20, 40‧‧‧ Alignment cloth

11‧‧‧ plush

13‧‧‧ warp

15‧‧‧ Weft

31‧‧‧Roller

33‧‧‧Rolling center shaft

35‧‧‧Liquid LCD panel with alignment film

37‧‧‧Loading substrate

41‧‧‧Textile machine

100, 200‧‧‧ base cloth

1 to 2 are schematic views of an alignment cloth in an embodiment of the present invention; FIG. 3 is a schematic view showing an alignment cloth applied to an alignment device in an embodiment of the present invention; and FIG. 4A is an alignment in an embodiment of the present invention; The cutting method of the cloth; the 4B is a cutting method of the alignment cloth in the prior art; the 5A-5B is a sectional view of the alignment cloth 10 in the y direction in the embodiment of the present invention; and the 5C drawing In a comparative example of the invention, a cross-sectional view of the velvet cloth in the y direction.

2πr‧‧‧roller circumference

W‧‧‧ Alignment latitude width

W’‧‧·Textile machine width

L‧‧‧ alignment cloth warp length

RL‧‧‧Roll length

↑‧‧‧Fleece head tilt direction

10‧‧‧Alignment cloth

41‧‧‧Textile machine

Claims (8)

An alignment cloth, which is a cotton velvet cloth, consisting of a base fabric and a pile; wherein the base fabric component comprises cotton, rayon, or a mixture thereof, which is woven from a warp yarn and a weft yarn, and the weft yarn and the weft yarn The ratio of the diameter of the warp yarn is between 1:0.8 and 1:0.95; and wherein the composition of the pile is a cotton combed yarn, and the ratio of the diameter of the pile to the warp yarn is between 1:0.75 and 1:0.95. And the direction of inclination of the pile of the pile is substantially parallel to the weft. The alignment cloth of claim 1, wherein the pile has a diameter of between 0.17 mm and 0.2 mm, and the piled cotton fiber has a micronaire of between 3.2 and 4.2. The alignment cloth of claim 1, wherein the pile of the pile has an inclination angle of 5 to 40 degrees. The alignment cloth of claim 1, wherein the ratio of the diameter of the pile to the diameter of the weft yarn is between 1:0.75 and 1:1.3. The alignment cloth of claim 1, wherein the pile comprises a W-shaped pile or a V-shaped pile. The alignment cloth of claim 1, wherein the lint yarn portion of the lint fabric is a mercerized cotton linter cloth. An aligning device comprising: a carrying platform; a roller above the carrying platform; and an alignment cloth according to claim 1 covering the surface of the roller; wherein the warp of the aligning cloth is parallel to the roller Central axis and the hair The direction of inclination of the pile is substantially perpendicular to the central axis of the drum. The alignment device of claim 7, wherein the central axis of the roller is greater than 80 cm.