JPH04104422U - extrusion die - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain high-quality multilayer films and sheets by enabling lamination molding while maintaining the necessary temperature difference between the resins in each layer in the resin temperature at the confluence part of a multilayer flat die for extrusion molding. With the goal. [Structure] In a multilayer flat die for extrusion molding, which has a plurality of resin flow channels 114, 115, and 116 and has voids 112 and 113 separating the resin flow channels, each resin flow channel 1
14, 115, 116 are separated into a set of independent dies 201, 202, 203, 204, 205, 206, and each set of dies is combined with heat insulating plates 29, 30, 31, 32 in between. This allows for in-die stacking.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is for extrusion molding applicable to multilayer film forming equipment, multilayer sheet forming equipment, etc. It's about the die.

0002

[Conventional technology]

Figure 4 is a perspective view of an example of a conventional multi-manifold type T-die for three-layer coextrusion. , FIG. 5 is a sectional view taken along line A--A in FIG. 4, and FIG. 6 is an enlarged view of a portion of FIG.

0003 In Figure 5, each resin supply port 1, 2, 3, each resin supply port and manifold Resin passages 4, 5, 6 connecting the , manifolds 7, 8, 9, and the slit following the manifold Passages 10, 11, 12, merging channel 13, and discharge slit 14 at the lower end of merging channel 13 are four metal blocks, block A15, block B16, and block C1. 7. It is formed by block D18. These blocks are connected by connecting bolts (Fig. (not shown) (between blocks A, B, and C and between blocks C and D) has been done. In addition, a notch with a notch width of 1 cm is provided in block C to form a cavity 19. has been completed. A cooling flow jetting pipe 20 and a partition wall 21 are arranged in this cavity 19, and the It is fixed to lock C17.

0004 In FIG. 6, block C17 is separated by a notch that spans the entire width of the T-die. At the same time, a gap 19 is formed. This cavity 19 is for cooling flow jetting. It is divided into two parts by a partition wall 21 integrally connected to the piping 20, and has two spaces 19 and 20. and 19'. In addition, the cooling flow jetting pipe 20 has a partition wall 21 and a low temperature side. For flowing cooling flow into the cavity 19 formed by the wall of the block forming the resin passage. A large number of cooling flow jet holes 22 are opened in the longitudinal direction of the cooling flow jetting pipe 20. .

[0005] Now, in the conventional multi-manifold die mentioned above, By providing a cavity 19 in the block that constitutes the passage up to the front, the tree on the high temperature side Heat conduction from the blocks that make up the resin passage to the blocks that make up the resin passage on the low temperature side In addition to preventing heat transfer due to A partition wall 21 is installed that divides the gap into two parts, and this cooling gas flow allows the resin passage on the low temperature side to By cooling the block wall connected to the It is designed to maintain temperature differences.

[0006]

[Problem that the idea aims to solve]

However, in the conventional method, a notch is provided to serve as the void portion, and the void portion 19 is It is very difficult to process the entire width of the die. The wall surface of the confluence part of the flow paths 11 and 12 is an integral member, and the resin temperature is controlled at the confluence part. There was a drawback that it could not be completely separated.

[0007] This invention allows the temperature of each layer of resin and resin flow path to be controlled independently until just before they merge. At the same time, the above-mentioned conventional problems can be solved as it has a shape that can be easily machined. The present invention aims to provide a die for extrusion molding.

[0008]

[Means to solve the problem]

For this reason, the present invention has multiple resin flow channels, and a gap is provided to isolate each resin flow channel. In a multilayer flat die for girder extrusion molding, each resin flow path is separated into an independent shape. A set of dies is used, and each set of dies can be stacked inside the die by combining multiple sets of dies with a heat insulating plate in between. It is a means to solve problems.

[0009]

[Effect]

Completely separate the isolation gaps between multiple layers. A, so that each die can be laminated within the die without the resin of each layer coming into contact with air. The tip flow path of each die is closely combined, and the temperature of each block can be controlled independently. This allows the resin layers to be stacked while maintaining the necessary temperature difference between each layer of resin.

0010 As a result, each layer resin flow path is composed of an independent block (die body). The contact area is minimized to minimize heat transfer between each block, and the By aligning the bodies, thermal resistance is created on the mating surfaces, reducing heat transfer, so each layer The resins can be laminated together while ensuring the necessary temperature difference between the resins. Also The mating surfaces of the tip flow path are sufficiently finished to ensure complete sealing. At the same time, the resin pressure in the flow channels of each adjacent layer pushes each other and has self-sealing properties. Therefore, there will be no resin leakage.

[0011]

【Example】

The present invention will be explained below with reference to the embodiments shown in the drawings. Figures 1 to 3 are examples of the present invention. Fig. 1 is an overall view of the three-layer composite device, Fig. 2 is a sectional view taken from B to B in Fig. 1, and Fig. 3 is a cross-sectional view of Fig. 2. 2 shows a cross-sectional view of another embodiment corresponding to FIG. First, in FIG. 1, 101, 102, 10 3 is a conduit connecting the extruders A, B, C and the die 100, and the pipes from the extruders A, B, C A device that supplies each resin to the inlet channels 114, 115, and 116 of the die 100, respectively. It is.

0012 Next, in FIG. 2, the resin flow path 116, manifold 119, and slit 122 are It is formed by tightening the die body 206 and the die body 205 with bolts 111. It is. In addition, the resin flow path 115, manifold 118, and slit 121 are the die base. It is formed by tightening the body 203 and the die body 204 with bolts 109. Ru. Furthermore, the resin flow path 114, manifold 117, and slit 120 are connected to the die body 2. 01. Tighten the die body 202 with the same bolt (not shown) as the bolt 111 above. It is formed by

[0013] Now, as shown in the figure, the three die body assemblies have slits 120, 121, 12. By aligning the two and tightening with the bolt 110, a merging path 123 is formed. be done. Note that the mating surfaces 125 to 126 and 127 to 128 is provided with a relief and the contact surfaces are the mating surfaces of 125, 126 and 127, 128. When the respective die body assemblies are combined, the gaps 112 and 11 are 3 is formed. Also, the insulation materials 29, 30, 31, and 32 This prevents heat transfer. In addition, 108 in the figure is a heater for heating the main body. The required number of die inserts are installed in the longitudinal direction to control the temperature of the die body. Ru. In addition, 107 is a lip adjustment bolt, which is used to adjust the amount of the filter that is discharged from the lip outlet 124. This is to adjust the thickness of the film (or sheet) in the width direction.

[0014] Next, to explain the operation, the molten resin extruded from each extruder is transferred to conduits 101, 1 02, 103 and flow paths 114, 115, 11 from the die inlets of extruders A, B, C. 6, respectively. The molten resin first supplied to the inlet channel 114 is It enters the manifold 117, expands in the die width direction, passes through the slit 120, and joins. It is pushed out to the flow path 123. On the other hand, the molten resin supplied to the flow path 115 is It enters the mold 118, expands in the die width direction, and then passes through the slit 121 to form the confluence channel. It is pushed out to 123. Furthermore, the molten resin supplied to the flow path 116 is 119, expands in the die width direction, passes through the slit 122, and enters the confluence channel 123. being pushed out. The molten resin extruded from each of the above three channels is transferred to the confluence channel 1. It is laminated into three layers at 23 and pressed into a film (or sheet) from the lip outlet 124. It is then cooled and solidified by cooling rolls 125.

[0015] As mentioned above, there are various types of films (or sheets) formed using the in-die lamination method. There are various combinations of raw materials, each with different molding temperatures, and it is necessary to compensate for these temperature differences. Whether or not the multilayer film product can be molded depends on whether or not it can be secured within the factory. determined. In addition, it is desirable that the flow path 123 after the laminated layers merge has the minimum necessary length. .

[0016] FIG. 3 shows a second embodiment of the present invention, in which an air gap 131 (from the die outlet to the cooling rotor) is shown. The tip of the die lip 130 and Although the merging channel 123' is made longer, there is a difference in operation and effect from the embodiment shown in FIG. There is no difference.

[0017]

[Effect of the idea]

As explained in detail above, in the present invention, the die body forming the flow path in each layer is Each slit in each die body assembly is made independently so that each resin can be laminated. and each die body assembly to form an air gap. Minimize the transfer of temperature between three-dimensional objects, and perform laminated molding of resins with large temperature differences as described above. This makes it possible to mold resins with large molding temperature differences, which were previously impossible to mold. Laminated molding is also possible, and the flow characteristics change depending on the temperature on the opposing flow path side. This eliminates the problem of burning or burning of the resin. (sheet) can be formed. Furthermore, each layer should have a separate and independent die structure. The die is easy to process and can be provided at a low price.

[Brief explanation of drawings]

FIG. 1 is an overall plan view of a multilayer die according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line B-B in FIG. 1;

FIG. 3 is a side sectional view corresponding to FIG. 2 showing a second embodiment of the present invention.

FIG. 4 is a perspective view of a conventional multilayer die.

FIG. 5 is a sectional view taken along line A-A in FIG. 4;

FIG. 6 is an enlarged sectional view of a main part in FIG. 5;

[Explanation of symbols] 29, 30, 31, 32 Heat insulating plate 100 Dies 101, 102, 103 Conduits 112, 113 Gaps 114, 115, 116 Die inlet channels 117, 118, 119 Manifolds 120, 121, 122 Slits 123, 123 ' Merging channel 124 Lip outlet 125, 126, 127, 128 Each die body assembly mating surface 130 Die lip tip 131 Air gap 201, 202, 203, 204, 205, 206 Die body

Claims (1)

[Scope of utility model registration request] Claim 1: In a multilayer flat die for extrusion molding having a plurality of resin flow channels and providing gaps for isolating each resin flow channel, each resin flow channel is formed into a set of dies having a separate and independent shape, A die for extrusion molding, characterized in that a plurality of the same sets of dies can be stacked inside the die by combining a plurality of dies with heat insulating plates in between.