KIM, Hyeon Gyeong (Wondang Village B-401, Bongcheon-11dong 82-5 Gwanak-gu, Seoul 151-061, KR)
Claims
[1] A disk die comprising a disk stacker 10 in which a plurality of disk dl,d2,d3,dl,d2,d3 and d are stacked and a dual tube-like hollow guide 20 having one end attached along the cylindrical side wall of the disk stacker 10 and the other end extending in the shape of narrowing circular slit, each disk dl,d2,d3,dl,d2 and d3 including a central area 11 in which a plurality of ports 12,13 and 14 are aligned to form resin flow passages, a recess 16 formed outside the central area 11 having a predetermined depth and a flow out area 18 formed between the outside of the recess 16 and the outer periphery of the disk dl 5 d2,d3,dl,d2,d3 and having the depth lower than the central area 11 and higher than the recess 16, and the gates 22,23 and 24 are formed on the disk dl,d2,d3,dl,d2 and d3 between one of the ports 12,13 and 14 and the adjacent recess 16.
[2] A method of forming a multi-layer thermoplastic resin products comprising of stacking a plurality of disk dl,d2,d3,dl,d2,d3 and d, each disk dl 5 d2,d3,dl,d2 and d3 including a central area 11 in which a plurality of ports 12,13 and 14 are aligned to form resin flow passages, a recess 16 formed outside the central area 11 having a predetermined depth and a flow area 18 formed between the outside of the recess 16 and the outer periphery of the disk dl,d2,d3,dl,d2 and d3, and the gates 22,23 and 24 are formed on the disk dl,d2,d3,dl,d2 and d3 between one of the ports 12,13 and 14 and the adjacent recess 16, supplying the melted resin into the different ports 12,13 and 14 among the adjacent disks dl,d2,d3,dl,d2 and d3, flowing out the resin films through the flow out area 18 and passing the concentrically laminated multi-layer resin film through the dual tube-like hollow guide 20 having one end attached along the cylindrical side wall of the disk stacker 10 and the other end extending in the shape of narrowing circular slit. |
Description
DISK DIES FOR FORMING MULTI-LAYER RESIN PRODUCTS
Technical Field
[1] The present invention relates to a disk dies for forming multi-layer resin products and the method thereof, and more particularly to multi-layer disk dies being capable of increasing the number of disk layers with a simple and compact structure to produce a high quality resin products with desired properties and the method thereof.
[2]
Background Art
[3] Using dies, the thermoplastic resin products can be extruded with a tube shape to form a blown film, a pipe and a blown product. The thermoplastic resin tube may be formed by extruding the melted resin in extruder and laminating it into the multi-layer film in the dies with a circular slit and cooling it.
[4] To form a multi-layer resin product by use of the conventional feed block, the die heads of a plurality of extruder extruding the different kind of polymer resins are connected to a feed block, in which the different kind of resin films are laminated, and flows into the circular slit dies to form a desired product. This method using the feed block has some drawbacks in that if each polymer resin has different flowing property, the polymer resin can not flow uniformly in the die and result in the non-uniform layer thickness.
[5] Another method of producing multi-layer resin products uses the circular die having a multi-layer circular slits. This method has a drawback in that if the number of layer is increased, the die size is also increased. Therefore, the conventional circular die is difficult to form a 10 or more layer resin product.
[6] But if the layer number of the multi-layer resin products increases, the property of the resin products can be improved. For example, the tensile strength, the extensibility, the impact strength, the elasticity, breaking strength, the gas or water proof property, the low temperature resistance, the heat resistance, the chemical resistance, the soluble resistance can be improved by increasing the laminating layer. And the cost down and the enhanced productivity are also possible by increasing the laminating layer.
[7]
Disclosure of Invention
Technical Problem
[8] The conventional multi-layer resin products have limited laminating layers, and the dies with compact and simple structure to form the multi-layer resin product are not yet introduced.
[9]
Technical Solution
[10] The object of the present invention is to provide a disk dies for forming multi-layer thermoplastic resin products being capable of increasing the number of disk layers with a simple and compact structure to produce a high quality resin products with desired properties and the method using the multi-layer disk dies.
[H]
[12] According to an aspect of the invention, there is provided a disk die comprising a disk stacker 10 in which a plurality of disk dl,d2,d3,dl,d2,d3 and d are stacked and a dual tube-like hollow guide 20 having one end attached along the cylindrical side wall of the disk stacker 10 and the other end extending in the shape of narrowing circular slit, each disk dl,d2,d3,dl,d2 and d3 including a central area 11 in which a plurality of ports 12,13 and 14 are aligned to form resin flow passages, a recess 16 formed outside the central area 11 having a predetermined depth and a flow out area 18 formed between the outside of the recess 16 and the outer periphery of the disk dl 5 d2,d3,dl,d2,d3 and having the depth lower than the central area 11 and higher than the recess 16, and the gates 22,23 and 24 are formed on the disk dl,d2,d3,dl,d2 and d3 between one of the ports 12,13 and 14 and the adjacent recess 16.
[13]
[14] According to another aspect of the invention, there is provided a method of forming a multi-layer thermoplastic resin products comprising of stacking a plurality of disk dl 5 d2,d3,dl,d2,d3 and d, each disk dl,d2,d3,dl,d2 and d3 including a central area 11 in which a plurality of ports 12,13 and 14 are aligned to form resin flow passages, a recess 16 formed outside the central area 11 having a predetermined depth and a flow area 18 formed between the outside of the recess 16 and the outer periphery of the disk dl,d2,d3,dl,d2 and d3, and the gates 22,23 and 24 are formed on the disk dl,d2,d3,dl,d2 and d3 between one of the ports 12,13 and 14 and the adjacent recess 16, supplying the melted resin into the different ports 12,13 and 14 among the adjacent disks dl,d2,d3,dl,d2 and d3, flowing out the resin films through the flow out area 18 and passing the concentrically laminated multi-layer resin film through the dual tube-li ke hollow guide 20 having one end attached along the cylindrical side wall of the disk stacker 10 and the other end extending in the shape of narrowing circular slit.
[15]
Advantageous Effects
[16] According to the invention, by stacking a plurality of disk dl 5 d2,d3,dl,d2,d3 and d and supplying the melted resin into the different ports 12,13 and 14 among the adjacent disk dl,d2,d3,dl,d2 and d3 and flowing out through the flow out area 18 of the
periphery of the disk, a simple and compact apparatus and the method to form a high quality multi-layer tubular resin products with increased number of layer could be achieved. And by changing the stacking order of the disks, the order of layer of laminated resin can be easily changed to easily change the property of the resin products.
[17]
Brief Description of the Drawings
[18] The above and other objects and features of the present invention will become apparent from the following description of preferred embodiments given in conjunction with the accompanying drawings, in which:
[19] FIG. 1 is an explosive view of an embodiment of the invention;
[20] FIG. 2 is a perspective of the disk stacker of Figure 1 ;
[21] FIG. 3 is a sectional view according to line a-a of Figure 2;
[22] FIG. 4 is a sectional view according to line b-b of Figure 2;
[23] Figure 5 is a sectional view according to line c-c of Figure 2.
Best Mode for Carrying Out the Invention
[24] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that they can be readily implemented by those skilled in the art.
[25] As shown in FIG. 1 and 2, there is provided a disk stacker 10 and a dual tube-like disk stacker 20 disposed at the periphery of the disk stacker 10. The disk stacker 10 comprises a plurality of disk dl, d2, d3, dl, d2, d3 and d which are contacted tightly to each other. The example of Figure 1 shows 6 disks are stacked except one cover disk d, but the number of layer can be changed.
[26] Each disk dl,d2,d3,dl,d2 and d3 includes a central area 11 with flat surface, a recess 16 formed at the outside of the central area 11 and the flow out area 18 formed at the outside of the recess 16 concentrically. A plurality of port 12, 13 and 14 are provided at the outer part of the central area 11. These ports 12, 13 and 14 are aligned to form resin flow passages through the disk stacker 10. The recess 16 is the lowest part of disk, and flow out area 18 has the depth lower than that of the central area 11 and higher than that of the recess 16. Therefore, if the disks are stacked, the central part 11 is tightly contacted and a gap g is formed at the flow out area 18 along the periphery of the disk stack 10.
[27] And gates 22, 23 and 24 are formed on the disk dl, d2, d3, dl, d2 and d3 between one of the ports 12, 13 and 14 and the adjacent recess 16. Figure 3 is a sectional view taken along the line a-a of Figure 2 and shows the gates 22 and 22 are formed on the ports 12, 12 of the disk dl, d2, Figure 4 is a sectional view taken along the line b-b of
Figure 2 and shows the gates 23, 23 are formed on the ports 13, 13 of the disk d2, d2, and Figure 5 is a sectional view taken along the line c-c of Figure 2 and shows the gate 24, 24 are formed on the ports 14, 14 of the disk d3, d3.
[28] The hollow guide 20 is shaped as dual tube and the inner one end of it is attached on the cover disk d outside of the disk d3 of the disk stacker 10 and the outer one end of it is attached on the opposite disk dl of the disk stacker 10. And the other end of the hollow guide 20 extends with narrowing circular slit to form an outlet of multi-layer resin product.
[29] According to the above structure, if different kind of melted resins A, B and C are supplied into each ports 12, 13 and 14 of the disk stacker 10, the resin A will flow through port 12 of Figure 3 and pass gates 22, 22 into the recess 16 and flow out through the gap g of the flow out area 18 and guided by the hollow guide 20 to form a tubular shape. Similarly, the resin B will flow through port 13 of Figure 4 and pass gates 23, 23 into the recess 16 and flow out through the gap g of the flow out area 18 and guided by the hollow guide 20 to form a tubular shape. And the resin C will flow through port 14 of Figure 5 and pass gates 24, 24 into the recess 16 and flow out through the gap g of the flow out area 18 and guided by the hollow guide 20 to form a tubular shape. The different kind of tubular resin films guided by the hollow guide 20 will laminated concentrically to form a tubular multi-layer resin product.
[30] Though the illustrated example is a 6 layer film, the number of layer may be properly changed. For example, if the thickness of the central area 11 of the disk is made by 3mm, the thickness of the recess 16 of the disk is made by lmm and the thickness of the flow out area 18 is made by 2mm, then the number of layer of film will be more much increased with the compact and small size of the disk die.
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