JP2006264848A - Roving cheese and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roving cheese in which one or a plurality of layers of a wound roving does not fall off when a roving package is vertically placed and the roving internally contacting a space penetrating both ends of its central part is pulled out and used, and a method of manufacturing such a roving cheese using a common winding device. <P>SOLUTION: The roving cheese and its manufacturing method are provided, in which the roving wound at a kth layer and a wound roving at a k+2th layer is wound in a state of contacting in parallel along the longitudinal direction of a fiber or in an overlapped state. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a glass roving cheese obtained by winding glass fibers into a cylindrical shape and a method for producing the same.

Glass roving cheese (also referred to as a glass roving roll) has been conventionally produced by the method described below. First, several hundred to several thousand glass fiber filaments are pulled out from the bushing, and a sizing agent is applied to the filaments and wound around the winding tube at a high speed while traversing the strands bundled into one bundle. Dry to get a cake. Pulling out a plurality of strands from the obtained plurality of cakes, winding them around the winding main shaft while traversing the rovings gathered in parallel along the longitudinal direction of the fibers (hereinafter referred to as the fiber length direction as appropriate), After winding, it is removed from the winding main shaft to obtain a cylindrical roving cheese in which a portion of the winding main shaft has penetrated. The obtained roving cheese is coated with a heat shrink film such as polyvinyl chloride, polyethylene or polypropylene on the outer surface by heat treatment to obtain a roving package.

  Glass roving cheese is used in the glass fiber reinforced plastic (FRP) molding field such as spray-up molding, preform molding, SMC (Sheet Molding Compounds) molding, etc. I came. In the production of SMC molding sheet, which is a composite compound of thermosetting resin and glass fiber, a large amount of roving is used all at once. It took time and labor to connect the end and start of many rovings, and increased the number of times the roving package was switched, resulting in a loss of productivity. In addition, glass roving with many yarns has a problem of deteriorating the quality of the SMC sheet, such as partial resin impregnation failure, because poor dispersion occurs in the chopped strands from which the yarn is cut, and it is difficult to impregnate the resin there. It was.

  In order to reduce the stringing of the roving as one of the solutions to such problems, the glass roving package has been shifted to a large roving package having a larger outer diameter and winding height. Many things that exceed are also used. However, the large roving package is prone to collapse of the roving that is inscribed in the space that penetrates between both ends of the central part of the roving package when it is pulled out and used while unraveling the roving. However, there was a problem that knotted the work by making a knot.

  As one means for solving such a problem, there is known a roving package in which a plurality of rovings are substantially parallel and wound on the same winding layer with a small overlap (Patent Document 1).

  Further, a roving package in which layers wound at a large twill angle and layers wound at a small twill angle are alternately arranged and a manufacturing method thereof are known (Patent Document 2).

Furthermore, a manufacturing method of glass roving cheese that is wound so that adjacent rovings in the same winding layer (in the same traverse) are in contact with each other or overlapped is known (Patent Document 3).
JP-A-7-257818 JP-A-7-237820 JP-A-5-229731

  The means described in Patent Document 1 requires a plurality of devices such as a tension applying device in order to wind up a plurality of rovings simultaneously. Further, when the number of devices such as a tension applying device increases, it is not possible to eliminate the concern that troubles such as interruption of the feeding of the strands and rovings are increased in the process of drawing the strands from the cake and collecting them in the rovings.

  In the means described in Patent Document 2, the mechanism of the device for realizing it is complicated, so that the winding device becomes expensive.

  In the means described in Patent Document 3, since the setting of the number of winds is extremely large (for example, the number of winds is 285 when the height of roving cheese is 1000 mm), the winding twill angle of roving cheese is small. Roving cheese and roving packages wound at a small winding twill angle from the beginning to the end of winding, as pointed out by Patent Document 2, are used for removal from the winding device, heat treatment in an oven, and transportation. Deformation due to handling such as movement. As a result, when the roving inscribed in the space penetrating between both ends of the central portion of the roving package is pulled out, the unraveling property is poor.

  An object of the present invention is to provide a roving cheese in which one or several layers of roving wound up when a roving package is placed vertically and a roving inscribed in a space penetrating between both ends of the central portion of the roving package is used. And it is providing the method of manufacturing such roving cheese with a general winding apparatus.

  The present invention has been made for the purpose of solving the above-mentioned problems, and in roving cheese manufactured by traversing a roving into a cylindrical shape, the traverse device moves once a half-reciprocating distance. The roving winding performed in step 1 is referred to as the first layer, k is a natural number, and the roving winding in which the number of half-reciprocations of the traversing device is the kth is referred to as the kth layer. The roving cheese is a roving cheese in which the roving taken and the roving taken up in the (k + 2) th layer are in contact or overlapped in parallel along the longitudinal direction of the fiber.

  Further, in the present invention, the winding number W is nh / 2 (h + d) ≦ W ≦ assuming that the half-reciprocating distance of the traverse device is h, the width of the roving is 2d, the winding number is W, and n is a natural number. It is roving cheese in the range prescribed | regulated by nh / 2 (hd).

  The present invention is the roving cheese as described above, wherein the wind number W is in a range defined by W <h / 2d.

  Furthermore, in the present invention, the roving cheese produced by traversing rovings into a cylindrical shape is referred to as one layer, and k is a natural number. The traversing of the roving performed by the kth rotation of the traverse device is called the k-th layer, and the roving wound in the k-th layer and the roving wound in the k + 2-th layer are the length of the fiber. It is the manufacturing method of roving cheese wound in the state which contacted or overlapped in parallel along the direction.

  According to the present invention, when a roving is pulled out and used, one or more layers of the roving inscribed in the space penetrating between both ends of the central portion of the roving package do not collapse, and the collapsed roving is rolled and knotted. There is no making. Therefore, the present invention is particularly suitable for a large roving package in which a collapse phenomenon is likely to occur.

  The roving traverse is performed by repeating the reciprocating motion in parallel with the take-up spindle by the traverse device at the same time as the roving is taken up by the rotation of the take-up spindle. If the first layer roving is taken up when the traverse device moves in the forward path parallel to the take-up spindle, the second layer roving is taken up when the traverse device moves in the return path. When k is a natural number and the roving of the kth layer is wound up by the movement of the traverse device, the k + 1th layer is wound up by the movement of the backward movement of the traverse device, and the k + 2 layer is It is wound by the movement of the traverse device. Therefore, both the k-th layer and the k + 2-th layer rovings are wound by the movement of the traverse device in the forward path or the backward path. If the number of winds is set appropriately, the roving of the kth layer and the roving of the k + 2 layer are wound in a state where they are in contact or overlapped in parallel along the fiber length direction except for the point where they intersect with the roving of the k + 1th layer. be able to.

  FIG. 1 is a schematic diagram of a cross section of roving cheese, in which a first layer 1 is inscribed in a space portion 0 penetrating between both ends of the central portion of the roving cheese, and a second layer 2 and a second layer are outside the first layer 1. 2 schematically shows that there is a third layer 3 on the outside of 2. FIG. 2 is a side view showing the features of the traverse winding of the present invention, in which the first layer roving and the third layer roving overlap in parallel along the fiber length direction and are wound around the winding main shaft 4. This is shown schematically. FIG. 2 shows only the first layer 1, the second layer 2, and the third layer 3. However, the k-th layer roving and the k + 2-th layer roving intersect with the k + 1-th layer roving, where k is a natural number. It is wound up in the state which overlapped in parallel along the fiber length direction except for the point to do.

  The roving cheese of the present invention in which the roving is wound in this way is overlapped in parallel along the fiber length direction except that the roving of the kth layer and the roving of the k + 2 layer intersect the roving of the k + 1 layer. Since the contact area between them is large, a relatively large frictional force acts between the roving of the kth layer and the roving of the k + 2 layer. Further, since the k + 2 layer roving acts to support the kth layer roving except for the point where the k + 2 layer roving intersects with the k + 1 layer roving, the wound roving penetrates between both ends of the central portion of the roving package. One or several layers of roving inscribed in the space penetrating between both ends of the central part of the roving package may collapse when used while being unwound from the side (hereinafter referred to as the inside of the roving package as appropriate). There is no.

  In addition, the roving cheese of the present invention is wound in a state where the k-th layer and the k + 2th-layer rovings are in contact with or overlapped in parallel along the fiber length direction. The unevenness of the inner surface (hereinafter referred to as “winding” as appropriate) that appears when unwinding is small, and the filling rate of the roving is small but large.

  When the roving is traversed, a touch roller (not shown) is pressed against the roving cheese to shape the roving cheese. The roving cheese of the present invention has many contact points between the roving cheese and the touch roller because of the unevenness of the winding of the roving, so that the pressure of the touch roller is applied evenly to the roving cheese, Roving will not be damaged.

  Moreover, since the filling rate of roving is slightly large, the roving cheese of the present invention is slightly compact in size (volume) with the same weight, and more roving is wound up with the same volume. There is a slight effect in reducing the transportation cost and the number of times of switching the roving package.

  Moreover, since the roving cheese of the present invention does not easily collapse when unraveled, the heating time in the heat treatment step after covering the outer surface of the roving cheese with a heat-shrinkable film could be reduced to about half. Conventional heat treatment conditions were, for example, 100 ° C. and 12 hours, but the heat treatment conditions were reduced to 100 ° C. and 6 hours according to the present invention. In the heat treatment, a heat shrink film is brought into close contact with the outermost layer roving to prevent the outermost layer from collapsing, and the bundling agent applied to the surface of the glass fiber is softened to bond the rovings in contact with each other. When the adhesive force is unwound and used, the roving is prevented from collapsing. The shortening of the heat treatment time decreases the adhesive force between the rovings due to the sizing agent, so that the roving tends to collapse. However, the collapsing prevention effect of the present invention is superior to the collapsing promoting effect due to the decrease in the adhesive strength of the sizing agent. It seems that the heat treatment time was shortened.

  Hereinafter, optimization of the number of winds for winding the roving of the kth layer and the roving of the k + 2 layer, which are the features of the present invention, in a state of contacting or overlapping in parallel along the fiber length direction will be described.

  In order to wind the roving wound in the kth layer and the roving wound in the k + 2th layer in contact, the distance obtained by adding or subtracting the width of the roving wound in the traverse device to the one round-trip distance While the traversing device moves, the winding spindle only needs to rotate an integer number of times. In order to perform the traverse winding according to the present invention, if the half-reciprocation distance of the traverse device is h, the width of the roving that is traversed is 2d, and n is a natural number, the one-way distance of the traverse device is 2h. The winding spindle only needs to rotate n times while the traverse device moves in the range of distance 2h-2d to 2h + 2d.

  FIG. 3 and FIG. 4 are side views showing the features of the traverse winding of the present invention, in which the k-th layer roving k and the k + 2nd layer roving k + 2 are wound in contact with each other in parallel along the fiber length direction. Is schematically shown. When the traversing device (not shown) moves from left to right while the roving cheese 5 rotates with the rotation of the winding spindle (not shown), the roving k of the k-th layer is traversed around the roving cheese 5 and then traversed. The k + 1-th layer roving (not shown) is traversed while the vibration device is folded back and moved from right to left, and the k + 2 layer roving k + 2 is traversed while the traverse device is folded and moved from left to right.

  FIG. 3 shows that when the traversing device (not shown) moves from point A to reciprocate and reaches point B just before point A by the roving width 2d, the roving k of the kth layer and the roving of the k + 2th layer A state in which k + 2 is in parallel contact along the fiber length direction is shown. To traverse the roving in this manner, the winding main shaft only needs to rotate n times while the traverse device moves the distance 2h-2d.

  Further, FIG. 4 shows that when the traversing device moves from point A to reciprocate and reaches point C that exceeds point A by the roving width 2d, roving k of the kth layer and roving k + 2 of the k + 2 layer. Are shown in parallel contact along the fiber length direction. In order to traverse the roving in this way, the winding spindle only needs to rotate n times while the traverse device moves the distance 2h + 2d. Since the winding number W is the number of revolutions of the winding main shaft while the traverse device moves a half reciprocating distance h, the traverse winding feature of the present invention is defined by the winding number W as follows: Can do.

nh / 2 (h + d) ≦ W ≦ nh / 2 (h−d) (1)
In the case of traversing so that adjacent rovings are in contact with each other in the same winding layer, the winding number W is represented by h / 2d. When traversing so that adjacent rovings overlap in the same winding layer, the winding number W exceeds h / 2d. In the present invention, a winding method in which adjacent rovings contact or overlap each other in the same winding layer is excluded for the reason described in the problem. Therefore, the wind number W is less than h / 2d, that is,
W <h / 2d (2)
It is.

  In addition, when the winding spindle rotates an integer n times while the traverse device moves the reciprocating distance 2h, that is, when W = n / 2, a space without roving is formed in the roving cheese. It may be excluded.

  When the half d of the roving width can be regarded as being much smaller than the half reciprocating distance h by the traverse device, the relationship of the equation (1) can be approximated by the following equation.

n / 2-nd / 2h ≦ W ≦ n / 2 + nd / 2h (3)
It can be seen from Equation (3) that the optimum number of winds is in the vicinity of a half integer.

  Hereinafter, the present invention will be described in detail based on examples and comparative examples. Table 1 shows a half-reciprocation distance h of the traverse device, a roving width 2d, a natural number n which means the number of rotations of the winding spindle while the traverse device makes almost one reciprocation, and a formula ( 1) The minimum value nh / 2 (h + d) of the wind number W indicated by 1), the maximum value nh / 2 (hd) of the wind number W indicated by formula (1), and the wind number W indicated by formula (2) The maximum value h / 2d, the set value of the wind number W, the presence or absence of collapse of the roving observed visually, and the size of the unevenness of the winding of the roving are shown.

A roving with a width of 7 mm, in which 17 strands drawn from 17 cakes are combined in parallel along the fiber length direction, has a half reciprocation distance of 760 mm, a winding speed of 480 m / min, and a wind number of 4.010. Winding, roving cheese having an inner diameter of 180 mm, an outer diameter of 560 mm, a height of 770 mm, and a weight of 220 kg was obtained. This roving cheese covered the outer surface with a heat shrink film, and was heat-treated in a hot air drying oven at 100 ° C. for 6 hours to obtain a roving package. The overlap of the k-th layer roving and the k + 2 layer roving was 3 to 4 mm. As shown in Table 1, the number of winds is in the range defined by the formula (1) and does not exceed the range defined by the formula (2).
In this roving package, when the roving was pulled out from the inside at a pulling speed of 80 m / min, one or several layers of the roving did not collapse. Moreover, the unevenness of the winding of the roving was small.

  A roving package having the same size and weight as in Example 1 was obtained in the same manner as in Example 1 except that the number of winds was 4.511. The overlap of the k-th layer roving and the k + 2 layer roving was 3 to 4 mm. As shown in Table 1, the number of winds is in the range defined by the formula (1) and does not exceed the range defined by the formula (2).

  In this roving package, when the roving was pulled upward from the inside at a pulling speed of 80 m / min, one or several layers of the roving did not collapse. Moreover, the unevenness of the winding of the roving was small.

  A roving package having the same size and weight as in Example 1 was obtained in the same manner as in Example 1 except that the number of winds was 5.012. The overlap between the k-th layer roving and the k + 2-layer roving was 3 to 4 mm. As shown in Table 1, the number of winds is in the range defined by the formula (1) and does not exceed the range defined by the formula (2).

  In this roving package, when the roving was pulled upward from the inside at a pulling speed of 80 m / min, one or several layers of the roving did not collapse. Moreover, the unevenness of the winding of the roving was small.

  A roving package having the same size and weight as in Example 1 was obtained in the same manner as in Example 1 except that the number of winds was changed to 5.513. The overlap of the k-th layer roving and the k + 2 layer roving was 3 to 4 mm. As shown in Table 1, the number of winds is in the range defined by the formula (1) and does not exceed the range defined by the formula (2).

  In this roving package, when the roving was pulled upward from the inside at a pulling speed of 80 m / min, one or several layers of the roving did not collapse. Moreover, the unevenness of the winding of the roving was small.

  A roving package having the same size and weight as in Example 1 was obtained in the same manner as in Example 1 except that the number of winds was changed to 6.015. The overlap between the k-th layer roving and the k + 2-layer roving was 3 to 4 mm. As shown in Table 1, the number of winds is in the range defined by the formula (1) and does not exceed the range defined by the formula (2).

  In this roving package, when the roving was pulled upward from the inside at a pulling speed of 80 m / min, one or several layers of the roving did not collapse. Moreover, the unevenness of the winding of the roving was small.

  A roving package having the same size and weight as in Example 1 was obtained in the same manner as in Example 1 except that the number of winds was changed to 6.516. The overlap of the k-th layer roving and the k + 2 layer roving was 3 to 4 mm. As shown in Table 1, the number of winds is in the range defined by the formula (1) and does not exceed the range defined by the formula (2).

  In this roving package, when the roving was pulled upward from the inside at a pulling speed of 80 m / min, one or several layers of the roving did not collapse. Moreover, the unevenness of the winding of the roving was small.

  A roving package having the same size and weight as in Example 1 was obtained in the same manner as in Example 1 except that the number of winds was 7.017. The overlap of the k-th layer roving and the k + 2 layer roving was 3 to 4 mm. As shown in Table 1, the number of winds is in the range defined by the formula (1) and does not exceed the range defined by the formula (2).

  In this roving package, when the roving was pulled upward from the inside at a pulling speed of 80 m / min, one or several layers of the roving did not collapse. Moreover, the unevenness of the winding of the roving was small.

  A roving package having the same size and weight as in Example 1 was obtained in the same manner as in Example 1 except that the number of winds was 7.518. The overlap of the k-th layer roving and the k + 2 layer roving was 3 to 4 mm. As shown in Table 1, the number of winds is in the range defined by the formula (1) and does not exceed the range defined by the formula (2).

  In this roving package, when the roving was pulled upward from the inside at a pulling speed of 80 m / min, one or several layers of the roving did not collapse. Moreover, the unevenness of the winding of the roving was small.

  A roving package having the same size and weight as in Example 1 was obtained in the same manner as in Example 1 except that the number of winds was 7.025. The overlapping of the k-th layer roving and the k + 2 layer roving was 1 to 2 mm. As shown in Table 1, the number of winds is in the range defined by the formula (1) and does not exceed the range defined by the formula (2).

  In this roving package, when the roving was pulled upward from the inside at a pulling speed of 80 m / min, one or several layers of the roving did not collapse. Moreover, the unevenness of the winding of the roving was small.

  A roving package having the same size and weight as in Example 1 was obtained in the same manner as in Example 1 except that the number of winds was 6.477. The overlapping of the k-th layer roving and the k + 2 layer roving was 1 to 2 mm. As shown in Table 1, the number of winds is in the range defined by the formula (1) and does not exceed the range defined by the formula (2).

  In this roving package, when the roving was pulled upward from the inside at a pulling speed of 80 m / min, one or several layers of the roving did not collapse. Moreover, the unevenness of the winding of the roving was small.

A roving package having the same size and weight as in Example 1 was obtained in the same manner as in Example 1 except that the number of winds was changed to 7.000. The overlap of the roving of the kth layer and the roving of the k + 2 layer was 7 mm. As shown in Table 1, the number of winds is in the range defined by the formula (1) and does not exceed the range defined by the formula (2).
This roving cheese was visually confirmed to form a space without roving.

  Comparative Example 1 A roving package having the same size and weight as in Example 1 was obtained in the same manner as in Example 1 except that the number of winds was 6.422. There was no overlap between the roving of the kth layer and the roving of the k + 2 layer. As shown in Table 1, the number of winds does not exceed the range defined by equation (2), but is outside the range defined by equation (1).

  In this roving package, when the roving was pulled out from the inside at a pulling speed of 80 m / min, one or several layers of the roving collapsed. Moreover, the unevenness of the winding of the roving was large.

  (Comparative Example 2) A roving package having the same size and weight as in Example 1 was obtained in the same manner as in Example 1 except that the number of winds was 6.805. There was no overlap between the roving of the kth layer and the roving of the k + 2 layer. As shown in Table 1, the number of winds does not exceed the range defined by equation (2), but is outside the range defined by equation (1).

  In this roving package, when the roving was pulled out from the inside at a pulling speed of 80 m / min, one or several layers of the roving collapsed. Moreover, the unevenness of the winding of the roving was large.

  (Comparative Example 3) A roving package having the same size and weight as in Example 1 was obtained in the same manner as in Example 1 except that the number of winds was 7.217. There was no overlap between the roving of the kth layer and the roving of the k + 2 layer. As shown in Table 1, the number of winds does not exceed the range defined by equation (2), but is outside the range defined by equation (1).

  In this roving package, when the roving was pulled out from the inside at a pulling speed of 80 m / min, one or several layers of the roving collapsed. Moreover, the unevenness of the winding of the roving was large.

The schematic diagram of the cross section of roving cheese. The side view which shows typically a mode that the roving of the 1st layer, the 2nd layer, and the 3rd layer was wound around the winding main shaft. The side view which shows typically a mode that the k + 2nd layer roving contacts with the left side of the kth layer roving and is traversed. The side view which shows typically a mode that the k + 2nd layer roving contacts with the right side of the kth layer roving and is traversed.

Explanation of symbols

0 Space part penetrated between both ends of the central part of roving cheese 1 First layer of roving cheese inscribed in the space part penetrated between both ends of the central part 2 Inscribed in the space part penetrated between both ends of the central part The second layer of roving cheese 3 The third layer of roving cheese inscribed in the space that penetrated between both ends of the center part 4 The winding spindle 5 The roving cheese in the middle of the twill winding k kth roving k + 2 k + second roving

Claims (4)

  In roving cheese manufactured by traversing a roving into a cylindrical shape, the traversing of the roving performed while the traversing device moves once a half-reciprocating distance is called one layer, and k is a natural number. The winding of the roving performed the k-th half-reciprocation is called the k-th layer, and the roving wound on the k-th layer and the roving wound on the k + 2-th layer are parallel along the longitudinal direction of the fiber. Roving cheese which is wound in a state where it touches or overlaps.   Assuming that the half-reciprocation distance of the traverse device is h, the width of the roving wound is 2d, the number of winds is W, and n is a natural number, the number of winds W is nh / 2 (h + d) ≦ W ≦ nh / 2 (h The roving cheese according to claim 1, which is in a range defined by -d).   The roving cheese according to claim 2, wherein the wind number W is in a range defined by W <h / 2d.   In the manufacturing method of roving cheese manufactured by traversing roving into a cylindrical shape, the traversing of roving performed while the traversing device moves once a half reciprocating distance is called one layer, and k is a natural number. The twill winding of the roving in which the number of half-reciprocations of the vibration device is k times is called the k-th layer, and the roving wound in the k-th layer and the roving wound in the k + 2-th layer are in the longitudinal direction of the fiber. A method for producing roving cheese, wherein the roving cheese is wound in a state of being in contact or overlapping in parallel.