JP4125843B2 - Coated extrusion mold - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a coated extrusion mold used when a surface of a long body having a circular cross section is coated with a resin extruded from an extruder, and in particular, a synthetic resin film on the surface of a cylindrical synthetic resin foam. It is suitable for use in the production of a cover material for heat insulation and the like coated with.
[0002]
[Prior art]
Conventionally, a crosshead die, an offset die, and the like are known as coating extrusion dies used when a surface of a long body having a circular cross section or the like is coated with a resin extruded from an extruder.
[0003]
That is, as shown in FIG. 5, when the synthetic resin film is coated on the steel pipe (A), a crosshead die (B) is used, and the steel pipe is inserted into the central through hole (C) of the crosshead die (B). Insert (b) as shown by the arrow, supply molten resin to the manifold (d) from an extruder (not shown), and extrude the synthetic resin from the extrusion port (e), thereby covering the surface of the steel pipe (b) with a synthetic resin film. Cover with.
[0004]
The thickness of the synthetic resin film is adjusted by adjusting the gap between the lips (g) by operating the lip adjustment bolt (f).
[0005]
[Problems to be solved by the invention]
However, in such extrusion coating with a conventional crosshead mold, in order to uniformly extrude the synthetic resin, the mold resin flow path has a complicated shape or the distance becomes long. There is a problem that the structure becomes complicated and large, and the mold design and production costs are high.
[0006]
Furthermore, even if adjustment of the gap between the lips (G) and G (G) by operating the lip adjustment bolt (E) is effective for symmetrical thickness deviation and poor resin flow rate balance, the thickness deviation does not necessarily occur symmetrically. However, this is not always the case, and if the uneven thickness does not occur symmetrically, it is not useful for adjusting the resin flow rate.
[0007]
The present invention has been made by paying attention to such problems in the conventional coated extrusion mold, and the object of the present invention is to solve the above problems, to simplify the structure, and to reduce the uneven thickness. An object of the present invention is to provide a coated extrusion mold capable of adjusting the resin flow rate even when it does not occur symmetrically.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the coated extrusion mold of the present invention according to claim 1 comprises:
A coated extrusion die that covers the surface of a long body with a resin extruded from an extruder, and a passage hole through which the long body passes is provided in the center, and is concentric with the passage hole and annular on its outer circumference A resin flow path is provided, and an independent resin reservoir is provided at a position where the inner circumference of the annular resin flow path is substantially equally divided. The annular resin flow path and each resin reservoir are communicated by a radial resin flow path. An adjustment valve for adjusting the resin flow rate is provided in the radial resin flow path, and a resin supply flow path from the resin reservoir to the passage hole is provided.
[0009]
The coated extrusion mold of the present invention according to claim 2
2. The coated extrusion mold according to claim 1, wherein the adjustment valve can be operated from outside the mold.
[0010]
The coated extrusion mold of the present invention according to claim 3 is
3. The coated extrusion mold according to claim 1 or 2, wherein the resin supply channels are separated on the resin reservoir side, and are connected to each other on the passage hole side of each resin supply channel, and the cross-sectional shape is a petal shape. It is characterized by.
[0011]
[Action]
In the coated extrusion mold according to the first aspect of the present invention, a passage hole through which the elongated body passes is provided at the center, and an annular resin flow path is provided concentrically with the passage hole on the outer circumference thereof. An independent resin reservoir is provided at a position where the inner circumference of the resin channel is substantially equally divided, and the annular resin channel and each resin reservoir are communicated by a radial resin channel, and reach from the resin reservoir to the passage hole. In use, when a long body to be covered is inserted into the passage hole and the resin is supplied to the annular resin passage outside the passage hole, the resin flows into the annular resin flow path. The resin reservoir is reached from the path via the radial resin flow path, and the surface of the elongated body is covered from the resin reservoir via the resin supply flow path. In addition, since the adjustment valve for adjusting the resin flow rate is provided in the radial resin flow path, the amount of resin passing through the radial resin flow path is adjusted by the adjustment valve.
[0012]
Further, in the coated extrusion mold according to the second aspect of the present invention, since the regulating valve can be operated from the outside of the mold, the amount of resin passing through the resin flow path is controlled by operating from the outside of the mold. Can be adjusted.
[0013]
Further, in the coated extrusion mold according to the third aspect of the present invention, the resin supply channels are separated on the resin reservoir side, and are connected to each other on the passage hole side of each resin supply channel, so that the cross-sectional shape is a petal shape. Therefore, it is possible to easily obtain a uniform resin coating state on the long body.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
1 is a cross-sectional view showing an example of a coated extrusion mold according to the present invention, FIG. 2 is an enlarged cross-sectional view of part A of FIG. 1, FIG. 3 is a cross-sectional view taken along line III-III of FIG. It is arrow sectional drawing in the IV-IV line of 1.
4, 1 is a rear disk of a coated extrusion mold according to the present invention, 2 is a front disk of a coated extrusion mold according to the present invention, and the coated extrusion mold according to the present invention is a rear disk 1. And the front disc 2.
[0015]
A passage hole 11 through which the tubular elongated body 3 to be covered passes is provided at the center of the rear disc 1, and an annular resin flow path 12 is provided on the outer circumference of the passage hole 11. Is provided concentrically with the passage hole 11. .. Are provided at positions where the inner circumference of the annular resin channel 12 is substantially equally divided, and the annular resin channel 12 and each of the resin reservoirs 13, 13,. It is connected by flow paths 14, 14.
[0016]
15 is a resin inlet provided on the outer peripheral surface of the rear disc 1, 16 is a resin passage extending from the resin inlet 15 to the annular resin passage 12, and 17 is a screw hole. 171 is screwed in, and the rear disk 1 and the front disk 2 are coupled by a coupling bolt 171. Reference numeral 18 denotes a pin hole. A positioning pin 181 is inserted into the pin hole 18, and the rear disk 1 and the front disk 2 are positioned by the positioning pin 181.
[0017]
A passage hole 21 through which the tubular elongated body 3 to be covered passes is provided at the center of the front disc 2, and a diameter-expanded portion 211 is provided in the passage hole 21. A resin supply passage 22 is provided around the passage hole 21, and the resin supply passage 22 is connected to the passage hole 21 side and corresponds to the resin reservoirs 13, 13. The cross-sectional shape is a petal shape. Reference numeral 221 denotes a junction.
[0018]
.. Are adjustment valve insertion screw holes provided outside the resin supply flow path 22, and the adjustment valve insertion screw holes 23, 23... Correspond to the radial resin flow paths 14, 14. As shown in an enlarged view in FIG. 2, the screw portions 231 of the adjusting valve insertion screw holes 23, 23,... Are screwed with the screw portions of the adjusting valves 24, 24,. , By rotating the regulating valves 24, 24,... In the forward and reverse directions from the front of the front disc 2, the regulating valves 24, 24,. The resin flow rate in the radial resin flow paths 14, 14,... Can be individually adjusted by the advance / retreat of. FIG. 2 shows a state in which the adjustment valve 24 has advanced most in the adjustment valve insertion screw hole 23 and the radial resin flow path 14 is closed by the tip of the adjustment valve 24.
[0019]
Reference numeral 25 denotes a bolt hole, and a connecting bolt 171 is inserted into the bolt hole 25. Reference numeral 26 denotes a pin hole, and a positioning pin 181 is inserted into the pin hole 26.
[0020]
Since the extrusion coating mold according to the present invention shown in FIGS. 1 to 4 has the above-described structure, in use, the tubular length to be covered with the passage holes 11 and 21 of the front and rear disks 1 and 2 is used. The scale 3 is inserted, molten resin from an extruder (not shown) is introduced from the resin introduction port 15, and is supplied to the annular resin channel 12 via the resin channel 16.
[0021]
The molten resin reaches the resin reservoir 13 from the annular resin channel 12 via the radial resin channel 14, and is coated on the surface of the elongated body 3 from the resin reservoir 13 via the resin supply channel 22.
[0022]
.. Are provided in the radial resin flow paths 14, 14... So that the amount of resin passing through the radial resin flow paths 14, 14. 24 .. Adjust individually. Therefore, the thickness of the resin coated on the surface of the long body 3 can be made uniform.
[0023]
Moreover, since the regulating valves 24, 24,... Can be operated from the front of the front disc 2, the amount of resin passing through the radial resin flow paths 14, 14,. It is easy to make the thickness of the resin coated on the surface of the long body 3 uniform.
[0024]
Also, the resin supply channels 22 are separated on the resin reservoir 13 side, and are connected to each other at the junction 221 on the passage holes 11 and 21 side of the resin supply channels 22, so that the cross-sectional shape is a petal shape. A uniform resin coating state on the long body 3 can be easily obtained.
[0025]
The embodiment of the present invention has been described above with reference to the drawings. However, the specific configuration of the present invention is not limited to the illustrated embodiment, and design changes within a scope not departing from the gist of the present invention can be made. include.
For example, the front and rear disks 1 and 2 may be square instead of circular as in the illustrated embodiment.
Further, the elongated body may be a solid rod-like body instead of a hollow tubular body as in the illustrated embodiment. Further, the long body may have a polyhedral cross section instead of a circular cross section as in the illustrated embodiment, but a long cross section is preferable because the resin can be easily and uniformly coated.
[0026]
【The invention's effect】
In the coated extrusion mold according to the first aspect of the present invention, in use, when a long body to be covered is inserted into the passage hole and the resin is supplied to the annular resin flow path outside the passage hole, the resin is Amount of resin that reaches the resin reservoir from the annular resin flow path via the radial resin flow path, is covered on the surface of the elongated body from the resin reservoir via the resin supply flow path, and passes through the radial resin flow path Therefore, the surface of the long body can be uniformly covered with the resin by operating the adjustment valve.
[0027]
Further, in the coated extrusion mold according to the second aspect of the present invention, since the amount of resin passing through the resin flow path can be adjusted by operating from the outside of the mold, the surface of the long body can be easily made of resin. Can be coated uniformly.
[0028]
Further, in the coated extrusion mold of the present invention as set forth in claim 3, since a uniform resin coating state can be easily obtained on a long body, a product with excellent quality can be easily manufactured. .
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of a coated extrusion mold according to the present invention.
FIG. 2 is an enlarged cross-sectional view of a portion A in FIG.
3 is a cross-sectional view taken along line III-III in FIG.
4 is a cross-sectional view taken along the line IV-IV in FIG. 1;
FIG. 5 is a cross-sectional view of a conventional coated extrusion mold.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Back disk 11 Passing hole 12 Annular resin flow path 13 Resin pool 14 Radial resin flow path 15 Resin introduction hole 16 Resin flow path 17 Screw hole 171 Connection bolt 18 Pin hole 181 Positioning pin 2 Front disk 21 Passing hole 22 Resin Supply passage 23 Adjustment valve insertion screw hole 231 Threaded portion 24 Adjustment valve 25 Bolt hole 26 Pin hole 3 Long body

Claims (3)

A coated extrusion die that covers the surface of a long body with a resin extruded from an extruder, and a passage hole through which the long body passes is provided in the center, and is concentric with the passage hole and annular on its outer circumference A resin flow path is provided, and an independent resin reservoir is provided at a position where the inner circumference of the annular resin flow path is substantially equally divided. The annular resin flow path and each resin reservoir are communicated by a radial resin flow path. A coated extrusion mold, wherein an adjustment valve for adjusting a resin flow rate is provided in a radial resin flow path, and a resin supply flow path from a resin reservoir to a passage hole is provided. 2. The coated extrusion mold according to claim 1, wherein the regulating valve can be operated from outside the mold. 3. The coated extrusion according to claim 1 or 2, wherein the resin supply channels are separated on the resin reservoir side, are connected to each other on the passage hole side of each resin supply channel, and have a petal shape in cross section. Mold.

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