JPS6030257B2 - Manufacturing equipment for thermoplastic synthetic resin sheets with double-sided patterns - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for producing a double-sided patterned thermoplastic synthetic resin sheet, and more particularly to an apparatus for forming an uneven pattern on the front and back surfaces.

Generally, as a device for forming an uneven pattern in a predetermined shape on a thermoplastic synthetic resin sheet, such as a polyamide resin sheet, molten polyamide resin is extruded from a die onto a patterned roll to form an uneven pattern in a predetermined shape. Devices are known (for example, devices described in Japanese Patent Publications No. 48-17094, Japanese Patent Publication No. 51-9785, and Japanese Patent Publication No. 51-22944).

However, these devices have the drawback that the transfer of the roll pattern onto the sheet is poor because the point at which the molten resin is press-fitted and solidified is only at the point of contact between a pair of Esobos rolls or an embossing roll/Nippro roll. In addition, with low viscosity polyamide, drawdown of the molten resin from the die occurs,
Banks are formed between the rolls. For this reason, there is also a drawback that a wavy pattern is formed on the sheet surface. Also, Kimiaki Tsubaki 3
Since the invention described in 8-18983 has a structure in which the rolls rotate freely, the rolls do not rotate smoothly when using a resin with a low melt viscosity or when molding a patterned sheet with shallow grooves.

Furthermore, since there is no interlocking between the winding device and the rolls, there is a drawback that high-speed molding cannot be performed. In addition, the special public
In the invention described in Japanese Patent No. 115629, the molten resin is in a pressure-sealed relationship between the patterned roll surface and the die. Therefore, it has the disadvantage of being affected by pressure fluctuations caused by the extruder. The present invention eliminates the above-mentioned conventional drawbacks, and provides an apparatus for manufacturing a double-sided patterned sheet that can reliably form an uneven pattern on the front and back surfaces of a thermoplastic synthetic resin sheet (hereinafter referred to as a sheet). It is on offer.

Hereinafter, details of the present invention will be explained in conjunction with embodiments shown in the drawings.

FIG. 1 explains the general structure of the entire device. In the figure, symbol 1 indicates an extruder, and the resin molding material supplied from a hopper 2 at the rear end is sequentially sent by a screw 3 to a die 4. Supplied.

At this time, the resin material is in a molten state, flows down from the resin path 5 of the die 4, passes through the gap between the wedge-shaped die 6 and the rear die 7, and is extruded onto the circumferential surface of the pattern roll 8. It flows along the circumferential surface of the pattern roll 8 which is further rotated by an electric motor in the direction of the arrow, and is simultaneously cooled and solidified to form a sheet. At this time, since a large number of grooves parallel to the extrusion direction of the molten resin are provided at the lower end of the wedge-shaped die 6 (this part is closest to the circumferential surface of the pattern roll 8),
A large number of uneven patterns parallel to the extrusion direction are formed on the upper surface of the molded sheet (the surface on the die side), and the lower surface of the molded sheet (
An arbitrary pattern on the circumferential surface of the patterned roll 8 is transferred onto the surface on the patterned roll side, resulting in a double-sided patterned sheet 9. The molded double-sided patterned sheet 9 is placed on a guide roll 01
This is guided and taken up by a belt-driven take-up machine 11.

FIG. 2 shows a cross section of the turret part of the apparatus of the present invention, in which 4 is the die, 5 is the molten resin passage, 6 is the wedge-shaped die, 7 is the rear die, and 8 is the molten resin passage. 6a is the inner slope of the wedge-shaped die 6, and 6b is the wedge-shaped die 6. The lower end 6c is a number of grooves with arbitrary cross-sectional shapes parallel to the extrusion direction of the molten resin provided in the lower end 6b of the wedge-shaped die 6, and 6d is the upper end of the wedge-shaped die 6, also indicated by the chain line. 12 is a side plate for regulating the width of the molded sheet.

The resin extruded from the resin passage 5 of the die 4 is guided between the inner slope 6a of the wedge-shaped die 6 and the pattern roll 8, and is pushed out by the rotation of the pattern roll 8 in the direction of the arrow. The resin is pressed against the slope 6a of the die 6 by pressure, and as a result, the resin is pushed into the uneven pattern formed on the circumferential surface of the patterned roll 8, cooled and solidified, and the circumference of the patterned roll 8 is formed on the lower surface of the molded sheet. Any pattern on the surface is transferred.

Secondly, during the pressure extrusion, a large number of grooves 6c of arbitrary cross-sectional shapes parallel to the direction of extrusion of the molten resin provided in the lower end 6b of the wedge-shaped die 6 form the upper surface of the molded sheet. A large number of uneven patterns with arbitrary cross-sectional shapes are formed parallel to the extrusion direction. There are no restrictions on the number, depth, and spacing of the grooves 6c. The intervals may be equal or irregular. One purpose of the apparatus of the present invention is to obtain a double-sided patterned sheet with a good transfer rate by combining the above-mentioned means, but another purpose is to prevent fluctuations in extrusion pressure on the extruder side To obtain a double-sided patterned sheet having a uniform degree of transfer without being affected.

The term "transfer degree" used in this specification refers to the filling rate of the molding material in the sheet cross-section forming space surrounded and defined by the wedge-shaped die 6, the pattern roll 8, and the side plate 12;
This refers to the reproducibility of the shape of the sheet cross-section forming space in the sheet cross section, and it is only when both the filling rate and reproducibility are good that the transfer degree is good. If either or both are insufficient, the degree of transfer will be poor.

In order to achieve this second objective, in the apparatus of the present invention, a gap d is provided between the lower end 7a of the rear die 7 on the resin passage 5 side and the circumferential surface of the pattern roll 8. , this gap d
It acts as an escape route for the molten resin as the extrusion pressure increases rapidly, preventing fluctuations in the degree of transfer to the molded sheet and eliminating the need for the molding operation to be carried out under strict control. It is of great help. In the apparatus of the present invention, in order to maintain an excellent transfer degree, it is preferable that the second
In the figure, the angle between the straight line connecting the lower end 6b of the wedge-shaped die 6 and the center o of the pattern roll 8 and the slope 6a is defined as the distance between the upper end 6d of the slope 6a and the top surface of the pattern roll 8. When d is the distance between the lower end 7a of the rear die 7 and the upper surface of the pattern roll 8,
200 and 1. enemy h/mSdSd.

It is better to meet the conditions of S5h/m. Further, as will be seen from the later examples, when polyamide is used as a molding material, the melting point of the polyamide should be set to X in order to improve release from the mold.

○, the surface temperature of the pattern roll is Y. When set to 0, X-125SY MiX-65 It is desirable to meet the following conditions.

Next, an example of forming a double-sided patterned sheet using the apparatus of the present invention will be shown.

In the examples, an apparatus as shown in FIGS. 1 and 2 was used.

Avoid redundant explanations of the drawing symbols mentioned above, and use the symbols with the same meaning. [Molding material] A = nylon 6 (number average molecular weight Mn = 22,000,
= 21500) B Nylon 66 (Mn = 26,000
, X255q0) [Extruder] Screw diameter 68h/m
, L/D=24 (D=screw diameter, L=screw length) C/R (compression ratio)=3.5 [Wedge-shaped die] The wedge-shaped die 6 has the following shapes as shown in FIGS. 3 to 5. Groove 6 as shown in
c was established.

4 is a front view seen from the left side of FIG. 3, and FIG. 5 is a partially cutaway sectional view taken along the line Q--Q in FIG. 3. The width h of the wedge-shaped die 6 is 30 mh/m, and the depth e of the groove 6c is 0.3.
h/m, width f is 0.6 h/m, pitch g is 1.2 h/m
, the radius R is 0.3 h/m, and the cross section of the groove 6c is semicircular. [Pattern roll] The pattern roll 8 has a cylindrical shape with a diameter of 12 h/m and a width of 300 h/m, and is hollow inside so that water for temperature adjustment can be supplied from the roll rotation shaft to the inside. There is.

As shown in FIG. 6 (cross-sectional view), countless grooves 13 are provided on the circumferential surface of the roll 8, which are arranged in parallel in the longitudinal direction. The depth j of the groove 13 is 0.5 h/m, and the width m is 0.8
h/m, and the width k of the peak 14 is 0. Blood/m. Between the peak 14' and the lower end 6b of the wedge-shaped die 6, there is a distance t of 0.8 h that regulates the thickness of the base portion of the molded sheet 9.
/m. [Molded Product] FIG. 7 shows a partial perspective view of the double-sided patterned sheet 9 molded by the above-mentioned apparatus.

In the figure, the direction indicated by the arrow is the direction in which the sheet 9 is taken up;
The upper surface of the sheet 9 faces the wedge-shaped die 6, and the lower surface faces the pattern roll 8. Examples 1 to 3 and Comparative Examples 1 to 2 Molding material: A Extrusion temperature: C, = 23030, C2 = 24000, C3
= 250℃, head = 260qo, die (whole) = 26
0qOY: 110008:900 4:10, Blood/m Molded sheet take-up speed: 100 arc/min Under the above conditions, a double-sided patterned sheet was molded by changing the value of d as shown in Table 1.

The results are shown in the same table. Table 1 Examples 4 to 6 and Comparative Examples 3 to 4 Sheets were formed in the same manner as in Example 1, except that the sheet take-up speed was 300 skins/min and the value of d was changed as shown in Table 2. I did it.

The results are shown in Table 2. Table 2 Examples 7 to 9 and Comparative Example 5 d to 5. Let h/m be the number 8 and do.
A sheet was formed using the same machine as in Example 1 except for the changes shown in the table.

The results are shown in Table 3. Table 3 Examples 10 to 13 and Comparative Examples 6 to 8 d to 5. A sheet was formed in the same manner as in Example 1, except that blood/m was changed and Y was changed as shown in Table 4.

The results are shown in Table 4. Table 4 Examples 14-17 and Comparative Examples 9-11 Molding material: B Extrusion temperature: C, = 26000, C2 = 27000, C3
= 280℃, head = 28000, die (whole) = 28
0008:900d:5. Enemy h/m F:10. h/m Formed sheet take-up speed: 100 arc/min Under the above conditions, a double-sided patterned sheet was formed by changing the value of Y as shown in Table 5.

The results are shown in Table 5. Table 5

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic configuration diagram explaining the whole, FIG. 2 is a sectional view of the die portion, FIG. 3 is a sectional view of the wedge-shaped die, and FIG. Fig. 4 is a front view seen from the left side of Fig. 3, Fig. 5 is a partially cutaway sectional view taken along the line Q-Q in Fig. 3, Fig. 6 is a sectional view of the circumferential surface of the pattern roll, and Fig. 7. FIG. 2 is a partial perspective view of a molded double-sided patterned sheet. 1...Extruder, 4...Die, 6...
・Wedge-shaped die, 6c...Groove, 7...
Rear die, 8... Pattern roll, 9...
Molded sheet with patterns on both sides, 11... Taking machine. Figure 1 Figure 6 Figure 7 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1 It has a die body that allows the molten resin supplied from the extruder to flow downward, a wedge-shaped die and a rear die that are installed opposite to each other at the bottom of the die body, and that rotates in close proximity to the wedge-shaped die. In an apparatus for manufacturing a patterned thermoplastic synthetic resin sheet having a roll, a number of grooves are provided at the lower end of the wedge-shaped die parallel to the extrusion direction of the molten resin, and the lower end of the wedge-shaped die is further connected to the center of the patterned roll. The angle θ between the straight line and the slope of the wedge-shaped die, the distance between the upper end of the slope of the wedge-shaped die and the top surface of the pattern roll is d_0, and the distance between the lower end of the rear die on the resin passage side and the top surface of the pattern roll is When the distance is d, 90°≦θ≦120° and 1
．． An apparatus for manufacturing a thermoplastic synthetic resin sheet with double-sided patterns satisfying 0 m/m≦d≦d_0≦50 m/m.