JP2645148B2 - Multi-layer parison extrusion equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-layer parison extrusion molding apparatus, and more particularly, to a method for injecting a sub-material into a sub-material cylindrical nozzle provided in a multi-layer head. The present invention relates to a novel improvement for improving the accuracy of the thickness of the peripheral wall of a multilayer parison to be formed by forming at least four inflow ports at substantially equal intervals on the circumference.

[Conventional technology]

A conventional multi-layer parison extrusion molding apparatus of this type is disclosed in Japanese Patent Application Laid-Open No. 62-99115.

In the configuration disclosed in the above-mentioned publication, the cylindrical nozzle portion for the auxiliary member formed in the multilayer head provided in the cylinder is disposed at a position facing each other on the circumference of the multilayer head. Supply the auxiliary material from the two inlets,
A multilayered parison was formed by injecting a multilayered secondary material into the main material.

[Problems to be solved by the invention]

The conventional multilayer parison extrusion molding apparatus has the following problems because it is configured as described above.

In other words, the sub-material is supplied to each of the cylindrical nozzles for the sub-material formed in the multilayer head from two inflow ports arranged to face each other in the diameter direction. When a product such as a gasoline tank is manufactured by blow molding, the thickness of the film becomes uneven at a position perpendicular to the film thickness, resulting in a variation in the film thickness and a decrease in yield.

The present invention has been made in order to solve the above-described problems, and in particular, an inflow port for inflow of a sub-material into a cylindrical nozzle portion for a sub-material provided in a multilayer head is provided with a circumferential opening. An object of the present invention is to provide an extrusion molding apparatus for a multilayer parison in which at least four places are formed at substantially equal intervals on the upper side to improve the accuracy of the thickness of the peripheral wall of the multilayer parison to be molded.

[Means for solving the problem]

An extrusion molding apparatus for a multilayer parison according to the present invention includes a ring piston operably provided in a cylinder, a resin storage chamber for guiding the ring piston, and a resin guide chamber formed in communication with the resin storage chamber. A ring-shaped multilayer head provided in the resin guide chamber, a die strip formed below the resin guide chamber, and a main material extruder for supplying a main material to the resin storage chamber. An extruder for a multi-layer parison having a sub-material extruder for supplying a sub-material to the multi-layer head, wherein the multi-layer head is formed in the multi-layer head and communicates with the sub-material extruder; A pair of supply ports formed to face each other, and an arc shape for a sub-material connected to each of the supply ports and extending in a direction opposite to each other by a substantially equal distance in a circumferential direction from each of the supply ports. Provided in the channel At least one pair of inlets, and a sub-material cylindrical nozzle portion connected to each of the inflow portions, and the sub-material cylindrical nozzle portion is disposed on the circumference at substantially equal intervals. In addition, the auxiliary material is supplied from at least four of the inflow ports.

(Operation)

In the multi-layer parison extrusion molding apparatus according to the present invention, at least four inflow ports arranged at substantially equal intervals on the circumference with respect to the sub-material cylindrical nozzle formed on the multi-layer head. Since the material is injected, the thickness of the peripheral wall of the cylindrical auxiliary material extruded from the auxiliary material cylindrical nozzle portion becomes uniform, and a product having a uniform thickness and a predetermined shape can be obtained during blow molding. Can be.

〔Example〕

Hereinafter, a preferred embodiment of an apparatus for extruding a multilayer parison according to the present invention will be described in detail with reference to the drawings.

1 to 6 show an apparatus for extruding a multi-layer parison according to the present invention. FIG. 1 is a schematic longitudinal sectional view showing the entire structure, and FIG. FIG. 3 is a plan sectional view showing a second sub-material inflow passage forming an inner layer, and FIG. 4 is a plan cross-sectional view showing a third sub-material inflow passage forming an outer layer. 5 and FIG. 5 are sectional development views schematically showing the respective inflow paths, and FIG. 6 is a sectional view showing a part of the multilayer parison.

In the figure, a reference numeral 1 denotes a cylinder whose upper part is formed in a cylindrical shape by a lid 2, and a cylinder-shaped resin storage chamber 3 formed in the cylinder 1 via a columnar core 1 </ b> A. Is a rod 4 led out of the lid 2
The ring piston 5 is provided so as to be reciprocally movable in the axial direction A.

The cylinder 1 at a position corresponding to the lower end of the resin storage chamber 3 is provided with a main material inlet 8 communicating with a main material connecting pipe 7 connected to a main material extruder 6. The main material extruded by the main material screw 6 a of the main material extruder 6 is injected into the resin storage chamber 3 through the main material injection port 8.

An annular resin guide chamber 9 is formed below the storage chamber 3 in the cylinder 1 so as to communicate with the storage chamber 3. In the resin guide chamber 9, a multilayer head 10 having an annular shape is formed. Arranged via a plurality of mounting pieces 11 (shown in FIGS. 2 to 4) provided on the surface 10a and the outer peripheral surface 10b, an inner resin flow path 12 is provided on the inner peripheral surface 10a side of the multilayer head 10. , Its outer peripheral surface 1
Outer resin flow paths 13 are formed on the 0b side.

A die 15 having a ring-shaped die slit 14 is connected to a lower portion of the cylinder 1, and the resin guide chamber 9 and the die strip 14 communicate with each other.

In the multilayer head 10, a first sub-material cylindrical nozzle portion 16 for guiding the first sub-material as a barrier layer is disposed at a central position in a radial direction. Inside and outside the cylindrical nozzle portion 16, a second auxiliary material cylindrical nozzle portion 17 for guiding a second auxiliary material as an inner layer made of an adhesive layer and a second auxiliary material as an outer layer made of an adhesive layer And a second auxiliary material cylindrical nozzle portion 18 for guiding the nozzle.

Each of the nozzle portions 16, 17 and 18 is provided with the multilayer head 10
Communicates with the die slit 14 via a head nozzle 19 formed at the lower end of the die.

On the outer peripheral surface 10b of the multilayer head 10, the cylinder 1
A head ring 20 sandwiched between the head ring 20 and the die 15 is provided. On the outside of the head ring 20, an auxiliary material formed in an arc shape and connected to the first auxiliary material cylindrical nozzle portion 16 is connected. A first sub-material extruder 22 is connected via an arc-shaped flow path 21, and the first sub-material extruded by the screw 22 a of the first sub-material extruder 22 is supplied to a first sub-material accumulator 23. After being stored, it is configured to be sent to the first auxiliary material arc-shaped flow path 21.

As shown in FIG. 2, the first auxiliary material arc-shaped flow path 21 is arranged symmetrically with respect to the diameter direction of the head ring 20, and these first auxiliary material arc-shaped flow paths are provided. A pair of inlets 21a and 21b formed at both ends of the passage 21
The connection is made at a total of four points at intervals of substantially 90 degrees on the circumference of the auxiliary material cylindrical nozzle portion 16.

Therefore, the first sub material cylindrical nozzle 16
The supply of the auxiliary material is performed from the above-described four locations.

Further, the first extrusion path 22b of the first sub-material extruder 22
2, is connected to the center of a first semicircular extrusion passage 22c formed in a semicircular shape, and is connected to the first semicircular extrusion passage 2c.
A pair of supply ports 22d formed at both ends of 2c are connected to the center of each of the first auxiliary material arc-shaped flow paths 21, and the arc-shaped flow paths 21 extend in the opposite directions from the supply ports 22d. Is formed.

A second sub-material extruder 30 for extruding a second sub-material formed of an adhesive layer is provided at an outer position of the head ring 20 at a position different from the mounting position of the first sub-material extruder 22. The head ring 20 is passed through a second auxiliary material extruding path body 33 having a first extruding path 31 and an outer layer extruding path 32 communicating with each other.
Are connected to a pair of second auxiliary material arc-shaped flow paths 34 and 35 formed in an arc shape.

The second sub-material extruded from the screw 30a of the second sub-material extruder 30 passes through the inner layer accumulator 36 and the outer layer accumulator 37 to form the second sub material arc-shaped flow path 34.
And 35 are provided.

As shown in FIGS. 3 and 4, each of the arc-shaped flow paths 34 and 35 for the second auxiliary material is symmetrically arranged in a multilayered state so as to face the head ring 20 in the diametrical direction. Second
A pair of inlets 34a and 34b and 35a and 35b formed at both ends of the arcuate flow passages 34 and 35 for the sub-material are substantially on the circumference of the cylindrical nozzle portions 17 and 18 for the second sub-material. A total of four connections are made at 90-degree intervals.

Therefore, the cylindrical nozzle portions 17 and 18 for the second auxiliary material are provided.
Is supplied from the above-described four locations.

Further, as shown in FIGS. 3 and 4, the inner layer extrusion path 31 and the outer layer extrusion path 32 connected to the second auxiliary material extruder 30 are formed in a semicircular second half. Circular extrusion path 40
A pair of supply ports 40a and 41a formed at both ends of each of the semicircular extrusion passages 40 and 41 are connected to the center of the third semicircular extrusion passage 41, respectively. It is connected to the center of roads 34 and 35.

FIG. 5 is a schematic plan view showing a state in which the first sub-material and the second sub-material are supplied to the nozzles 16, 17, and 18, respectively. Each nozzle 16, 1 of the multilayer head 10 is formed via the formed head ring 20.
FIG. 18 shows a supply flow path of an auxiliary material for 7 and 18. FIG.

In FIG. 5, the same components as those in FIGS. 1 to 4 are denoted by the same reference numerals, and description thereof will be omitted.

The apparatus for extruding a multilayer parison according to the present invention is configured as described above, and the operation thereof will be described below.

First, the main material extruded by the screw 6a of the main material extruder 6 is sent to the resin storage chamber 3 and stored while the ring piston 5 is pushed up.

In addition, the first auxiliary material extruder 22 and the second auxiliary material extruder 30
The first and second sub-materials extruded from the pistons 23a, 36a and 37a in the accumulators 23, 36 and 37, respectively.
Are stored in each of the accumulators 23, 36 and 37 while being pushed up.

Next, when these main materials and sub-materials reach a predetermined amount,
Ring piston 5 and each piston 23a, 36a and 37a
Are simultaneously pushed up, whereby the main material is pressure-fed toward the die slit 14 via the inner resin flow path 12 and the outer resin flow path 13 which are resin passages.

In this case, the main material passing through each of the resin flow paths 12 and 13 is:
The recording head is divided into an inner layer and an outer layer by the multilayer head 10. A first sub-material as a barrier layer extruded from each sub-material cylindrical nozzle portion 16, 17 and 18 of the multi-layer head 10 and an adhesive layer divided into inner and outer layers between the respective layers of the seed material. The second auxiliary material is injected.

The head nozzle 1 is provided through each of the nozzle portions 16, 17 and 18.
The resin layer injected from 9 is, as shown in FIG.
The first sub-material 50 of the barrier layer is formed at the center, and the second sub-material 51 of the adhesive layer is formed on both surfaces of the first sub-material 50. When the die exits the die slit 14, the main material 52 is sandwiched between both surfaces of the second sub-material 51. It is composed of three layers and five layers of cylindrical multilayer parison 60
Is obtained.

Next, a specific extrusion path of the first sub-material 50 and the second sub-material 51 extruded from the above-described sub-material extruders 22 and 30 will be described.

First, the first sub material 50 extruded from the first sub material extruder 22 is used.
Is formed through a first semicircular extrusion path 22c, a pair of supply ports 22d, a pair of first sub-material arc-shaped flow paths 21, and four inflow ports 21a and 21b. 16 and this nozzle part
A pair of cylindrical first sub-members 51 having a uniform film thickness is formed in the inside 16.

Also, the second sub-material 51 extruded from the second sub-material extruder 30 is used.
Are the first and second semicircular extrusion passages 40 and 41, and the respective supply ports.
40a and 41a, a pair of second sub-material arcuate flow paths 34 and 3
5, are sent to the second sub-material cylindrical nozzles 17 and 18 for the inner layer and the outer layer via the four inlets 34a and 34b and 35a and 35b, and into these nozzles 17 and 18 A pair of cylindrical second sub-members 52 are formed with a uniform film thickness.

Note that, in the present embodiment, the case where the auxiliary material is injected through four inflow ports for each auxiliary material cylindrical nozzle portion has been described, but the number is not limited to four and four or more. In this case, it is needless to say that the same operation and effect can be obtained.

In addition, although the case where three types and five layers of parisons are obtained has been described, a similar effect can be obtained when three types and three layers are used.

〔The invention's effect〕

The multilayer parison extrusion molding apparatus according to the present invention is configured as described above, and therefore, can obtain the following effects.

That is, the sub-material is injected into the cylindrical nozzle portion for the sub-material formed in the multilayer head from at least four inflow ports arranged at substantially equal intervals on the circumference. The thickness of the cylindrical auxiliary material extruded from the cylindrical nozzle for material and the finally obtained multilayer parison are made uniform over the entire circumference, and a product with a uniform shape and a uniform thickness is obtained during blow molding. Can be.

[Brief description of the drawings]

FIGS. 1 to 6 show an apparatus for extruding a multi-layer parison according to the present invention. FIG. 1 is a schematic longitudinal sectional view showing the entire structure, and FIG. FIG. 3 is a plan sectional view showing a second sub-material inflow passage forming an inner layer, and FIG. 4 is a plan sectional view showing a third sub-material inflow passage forming an outer layer. FIG. 5 is a sectional view schematically showing each of the inflow paths, and FIG. 6 is a sectional view partially showing a multilayer parison. 1 is a cylinder, 3 is a resin storage chamber, 5 is a ring piston,
6 is an extruder for the main material, 9 is a resin guide room, 10 is a multilayer head,
16, 17 and 18 are cylindrical nozzle parts for auxiliary material, 21a, 21b, 34a, 34b, 35a,
35b is an inlet, 21, 34, and 35 are arc-shaped channels for sub-materials, 22 and 30 are extruders for sub-materials, 22d, 40a, and 41a are supply ports, and 50 and 51 are sub-materials.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshio Kakiya 2-2-1, Fukuura, Kanazawa-ku, Yokohama-shi, Kanagawa Prefecture Inside Japan Steel Works, Ltd. (72) Inventor Keiji Fukuhara 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture No. Mazda Co., Ltd.

Claims (2)

(57) [Claims] 1. A ring piston (5) operably provided on a cylinder (1), a resin storage chamber (3) for guiding the ring piston (5), and a resin storage chamber (3). A resin guide chamber (9) formed in communication, a ring-shaped multilayer head (10) disposed in the resin guide chamber (9), and a die formed below the resin guide chamber (9). The main material (5) is inserted into the slit (14) and the resin storage chamber (3).
A multilayer extruder having a main material extruder (6) for supplying 2) and an auxiliary material extruder (22, 30) for supplying an auxiliary material (50, 51) to the multilayer head (10); In the parison extrusion molding apparatus, the extruder (2) formed on the multilayer head (10)
2, 30) and a pair of supply ports (22d, 40a, 41) formed in the multilayer head (10) so as to face each other in the diameter direction.
a) connected to the respective supply ports (22d, 40a, 41a) and formed in such a manner as to extend from the respective supply ports (22d, 40a, 41a) in the opposite directions by substantially equal distances in the circumferential direction. At least one pair of inlets (21) provided in the material arc-shaped flow path (21, 34, 35)
a, 21b, 34a, 34b, 35a, 35b) and the respective inlets (21a, 21b, 3
4a, 34b, 35a, 35b), the secondary material nozzle (1
6, 17, 18), and the cylindrical nozzle portion for the auxiliary material (16, 17, 1)
8), at least four inflow ports (21a, 21b, 34a, 34b, 35a, 35b) arranged at substantially equal intervals on the circumference so that the auxiliary material (50, 51) is supplied. A multi-layer parison extrusion molding apparatus, characterized in that: 2. The multi-layer head (10) has an auxiliary material (50,5).
1) The auxiliary material cylindrical nozzle section (16,
The multi-layer parison extrusion molding apparatus according to claim 1, wherein three (17,18) are arranged to obtain a five-layer parison.