JPH08164552A - Mold for extrusion and extrusion molding method using the mold - Google Patents

Abstract

PURPOSE: To provide a mold for extrusion having general versatility with which frequency of exchanging can be reduced, exchanging work is easy, and a multilayer extruded piece always having excellent precision can be extruded, and an extrusion molding method using the mold. CONSTITUTION: An extrusion molding mold 1 for extruding a plurality of kinds of extrusion materials simultaneously so as to mold a multilayer extruded piece comprises a preform die 10 to be mounted on an extrusion head H and a mouthpiece 20 to be detachably mounted on the preform die 10. The preform die 10 comprises a plurality of delivery passages 11 for sending off a plurality of kinds of extrusion materials to the mouthpiece 20 from the extrusion head H. The mouthpiece 20 comprises an extruding passage 23 which has a split structure, communicates with the delivery passages 11, gathers these passages to one place, and makes them confluent so as to extrude into an integral multilayer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extrusion molding die for extruding a plurality of kinds of extrusion materials at the same time to form a multi-layered extrudate and an extrusion molding method using the die. The present invention relates to an extrusion molding die and an extrusion molding method using the die, which are easy to obtain and can always obtain a highly accurate multilayer extrudate.

[0002]

2. Description of the Related Art As an extrusion molding die used for molding a multi-layered extrudate by simultaneously extruding a plurality of kinds of extrusion materials, there is one disclosed in, for example, JP-A-6-210702. In this extrusion molding die, a preform die is configured by combining divided bodies, and the extruded materials are sequentially merged in each divided body, and a multilayer extrudate laminated in a final predetermined shape is extruded by a die. .

As described above, the extrusion molding die is constructed by combining the preform dies with the divided bodies, so that it is possible to easily process the respective merging passages.
Since the merging passages are sequentially formed in each divided body, each divided body (the case frame and the passage processing plate) becomes thick, and the combined preform die becomes large. for that reason,
When the mold is replaced when extrusion molding a multi-layered extrudate of another shape, the replacement work becomes extremely complicated, the replacement work efficiency is poor, and the preform die is processed because the confluent passages are sequentially formed. There was a problem that was complicated and expensive.

Further, since the extruded material is sequentially merged in each divided body so that the final shape is obtained, a confluent position and a shape of the extruded material according to the final extruded shape are required,
It was necessary to replace the passage processing plate of the divided body formed by restricting this each time a final extrudate having a different shape was formed. Further, there is a problem that it is difficult to adjust the pressure distribution at that time, and it is impossible to always extrude a multi-layered extrudate having a predetermined shape and having high precision.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to have versatility and to be exchanged less frequently, and the exchange work is easy, and it is possible to always extrude a multi-layer extrudate with high accuracy, and An object of the present invention is to provide an extrusion molding die that can be made inexpensive without increasing the size of the preform die, and an extrusion molding method using the die.

[0006]

An extrusion molding die of the present invention for achieving the above object is an extrusion molding die for extruding a plurality of kinds of extruded materials at the same time to form a multi-layer extrudate, A preform die attached to the extrusion head, and a die detachably attached to the preform die. The preform die is configured to feed a plurality of the extruded materials from the extrusion head to the die. A delivery passage is provided, and the mouthpiece has a divided structure, and is provided with an extrusion passage that communicates with each of the delivery passages and merges the passages at one place to extrude into an integrated multilayer shape. And

Further, in the extrusion molding method of the present invention, a plurality of types of extruded materials respectively extruded from the extrusion head of an extruder are passed through respective delivery passages of a preform die attached to the extrusion head. Multi-layer extrusion in which a plurality of types of extruded materials from each of the delivery passages are collectively supplied at one place and fed into a divided structure die attached to a preform die to form an integral multi-layer shape. It is characterized by pushing out things.

[0008]

In this way, the preform die attached to the extrusion head is provided with a plurality of delivery passages for feeding a plurality of types of extrusion materials from the extrusion head to the die, and the die to be detachably attached to the preform die is the extrusion material. Even if it is necessary to replace the extrusion mold when molding a multi-layered extrudate of a different shape, the preform can Since it is much lighter than the die and only the die having a small shape needs to be exchanged, the work of exchanging the extrusion molding die can be performed extremely easily.

Conventionally, the passage processing plate of the divided body, which is formed by always regulating the confluent position and shape of the extruded material according to the final extruded shape, is replaced every time the extruded material of another shape is formed. Since it is not necessary, it has versatility,
The frequency of replacement can be reduced. In addition, since each delivery passage is merged and extruded into a multilayer shape by the extrusion passage of the die, it is possible to adjust the distribution of extrusion pressure more than in the case where the extruded materials are sequentially joined in each divided body as in the past. This makes it possible to always extrude a highly accurate multilayer extrudate laminated in a predetermined shape.

Further, since the extruding passages which are merged together at one place are provided in the die, it is not necessary to form the passages which are sequentially merged with the preform die, so that the preform die does not become large. Furthermore, unlike the conventional structure in which the confluence passages are sequentially formed, a simple structure in which the converging passages having a divided structure are joined together at one place facilitates processing and facilitates the extrusion molding. The mold can be cheap.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows an example of an extrusion molding die for simultaneously extruding a plurality of extruded materials of the present invention to form a multi-layer extrudate.
Is a preform die 10 mounted on the extrusion head H.
And a base 20 attached to the preform die 10.

The preform die 10 comprises a plurality of independent (four in this embodiment) delivery passages 1 for individually delivering a plurality of types of extruded materials from the extrusion head H to the die 20.
1a, 11b, 11c and 11d are provided corresponding to the number of plural kinds of extruded materials. Each delivery passage 11 is formed so as to linearly penetrate from the rear end face to the front end face of the preform die 10, and when the preform die 10 is mounted on the extrusion head H, the rear end of each delivery passage 11 is Extrusion head H
Connected to the tip of each delivery passage H1 of
1, H1 communicate with each other. The preform die 10 is configured to be detachably attached to the extrusion head H.

The die 20 is constructed in a superposition type divided structure having an upper die 21 and a lower die 22, and the upper die 21 further contacts the upper die body 21a and the extrusion head H. 21b and the left and right parts are superposed on each other in a two-divided structure, and the base 20 has a superposition structure in which the whole is divided into three parts. Base 20 combined with each other
Is detachably attached to the preform die 10.

Further, the base 20 and the upper die body 21a
When the mold side body portion 21b and the lower mold 22 are combined,
Communicating with each delivery passage of the preform die 10,
The passages are merged together at one place and pressed into an integrated multi-layered shape.
The extrusion passage 23 is provided. Extrusion passage 23
Is for delivery formed on the uppermost stage of the preform die 10.
The passage portion 23a communicating with the passage 11a and the second stage from the top
The passage portion 23b communicating with the delivery passage 11b and the lower two stages
And a passage portion 23c communicating with the delivery passages 11c and 11d
And the passage portion 23a penetrates the upper mold side body portion 21b.
Through section 23a₁And its penetrating portion 23a₁Upper mold body communicating with
Straight part 23a formed on the side surface facing the part 21a ₂And
And the passage portion 23b is provided on the lower surface of the upper die main body portion 21a.
The passage portion 23c is provided so as to face the lower die 22 and
The upper mold body 21a is disposed on the upper surface so as to face the upper mold 21 and
When the upper mold side body part 21b and the lower mold 22 are combined,
The upper and lower passage portions 23a and 23c are formed in a straight shape in the middle.
It merges with the formed passage portion 23b to form the extrusion passage 23.
I am trying to do it.

The extrusion port portion 23d of the extrusion passage 23 is formed to have a cross-sectional shape similar to the cross-sectional shape of a multi-layer extrudate that is integrally formed by extruding a plurality of types of extruded materials at the same time. , 23c, the extruded material merged into the passage portion 23b can be extruded into a required multilayer shape. As described above, the extrusion molding die of the present invention is configured such that the preform die 10 attached to the extrusion head H has a plurality of delivery passages 11a, 11b, 11c, which feed a plurality of types of extrusion materials from the extrusion head H to the die 20. Since the preform die 10 has a structure having 11d and the removable die 20 is provided with an extrusion passage 23 for extruding the extruded material into an integral multi-layer shape, a multi-layer extrudate having another shape is formed. Even if it is necessary to replace the extrusion molding die at this time, it can be dealt with by exchanging only the die 20 which is much lighter in weight than the preform die 10 and has a small shape. The work of exchanging the molding die can be performed very easily.

Further, conventionally, the passage processing plate of the divided body, which is formed by always regulating the confluent position and shape of the extruded material according to the final extruded shape, is replaced every time the extruded material of another shape is formed. Since it is not necessary, it has versatility,
The frequency of replacement can be reduced. Further, since the delivery passages are joined together and extruded into a multilayer shape by the extrusion passages 23 of the mouthpiece 20, the pressure distribution in the extrusion is adjusted more than in the conventional case where the extruded materials are joined in each divided body sequentially. Therefore, it is possible to always extrude a highly accurate multilayer extrudate laminated in a predetermined shape.

Furthermore, since the extruding passages 23 which are merged together at one place are provided in the die 20, it is not necessary to form passages which are merged into the preform die 10 in sequence, and the preform die 10 becomes large. Further, it is possible to avoid a structure in which the merging passages are sequentially formed as in the conventional case, and it is possible to form a simple passage structure in which the merging portions 20 having a divided structure are joined together at one place. Also, the extrusion die can be made inexpensive.

Next, using the above-mentioned extrusion molding gold, the cap C1, the wing tip C2, the undertread C
A tire tread Td having four layers of C3 and C4 will be taken as an example to describe a multilayer extrusion molding method of extruding integrally. First, four types of extruded materials extruded from an extruder (not shown) via the extrusion head H are supplied to the respective delivery passages 11 of the preform die 10 mounted on the extrusion head H. That is, the uppermost delivery passage 1
1a has a wing tip rubber R2, a second-stage delivery passage 11b has a cap rubber R1, a third-stage delivery passage 11c has an undertread rubber R3, and a lowermost delivery passage 11d has a The cushion rubber R4 flows in from each delivery passage H1 of the extrusion head H of the extruder. Each extruded material supplied to the preform die 10 is supplied to the die 20 through each delivery passage 11 as shown in FIG. 3, and the wing tip rubber R1 is provided at the passage portion 23a of the extrusion passage 23 at the wing. Molded into the shape of chip C2,
It merges with the passage portion 23b, and the passage portion 23b is stacked on the end portion of the extruded cap C1. Cap C1
Is molded into a strip shape when the cap rubber R1 is extruded from the delivery passage 11b to the passage portion 23b of the extrusion passage 23.

On the other hand, in the delivery passages 11c and 11d, the undertread rubber R3 and the cushion rubber R4 are formed into a sheet shape while passing through the passages, and the undertread rubber R3 and the cushion rubber R4 are formed in the extrusion passage. A four-layered shape whose width is defined by the passage portion 23c of 23, is formed into the shape of the undertread C3 and the cushion C4, is laminated on the lower surface of the cap C1 and merges, and is shaped into the shape of the extrusion opening portion 23d. The tire tread (multi-layered extrudate) Td is extruded from the die 20. Since each of the delivery passages is joined by the mouthpiece 20 and extruded in one state of the extrusion passage 23 in an integrated multi-layered state,
It becomes easier to adjust the pressure distribution of each extruded material when extruding than in the conventional method of sequentially joining the extruded materials in each divided body, and always obtain a highly accurate tire tread Td laminated in a desired predetermined shape. it can.

As described above, the present invention can be preferably used when extruding a tire tread Td having a multilayer structure, but it goes without saying that it is not limited thereto.
Further, although the example of the rubber material has been described as the extruding material, the extruding material is not limited to this, and a known extruding material conventionally used for multilayer extrusion can be used. For example, in addition to the rubber material described above, a plastic material or the like is preferable. Can be used.

[0021]

As described above, the present invention is an extrusion molding die for extruding a plurality of kinds of extrusion materials at the same time to form a multilayer extrudate, and a preform die mounted on an extrusion head, The preform die is detachably attached to the preform die, and the preform die has a plurality of delivery passages for delivering the plurality of types of extruded materials from the extrusion head to the die, respectively, and the die is Since it has an extrusion passage that communicates with each of the delivery passages and merges the passages at one place to extrude into an integrated multi-layered shape, it has versatility and therefore requires less frequent replacement. Exchange work is easy, a highly accurate multilayer extrudate can be extruded at all times, the preform die does not become large, and the extrusion molding die can be made inexpensive.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an example of an extrusion molding die of the present invention.

FIG. 2 is a front view of the main part of FIG.

FIG. 3 is an operation explanatory view showing an extrusion molding method using the extrusion molding die of FIG.

FIG. 4 is an enlarged front view of the main part of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Extrusion molding die 10 Preform die 11 Delivery passage 20 Die 21 Upper die 21a Upper die main body 21b Upper die side body 22 Lower die 23 Extrusion passage H Extrusion head

Claims (3)

[Claims] 1. A preform die for extruding a plurality of kinds of extruded materials at the same time to form a multi-layered extrudate, the preform die being attached to an extrusion head, and detachably attached to the preform die. The preform die has a plurality of delivery passages for delivering the plurality of types of extruded materials from the extrusion head to the die, and the die has a divided structure and each of the delivery passages. An extrusion molding die provided with an extrusion passage that communicates with the above, and merges the passages at a single location to extrude into an integrated multilayer shape. 2. The method according to claim 1, wherein the die is composed of an upper die and a lower die, and the upper die has a two-divided structure in which an upper die main body portion and an upper die side body portion are overlapped with each other. Mold for extrusion molding. 3. A plurality of extruded materials respectively extruded from an extrusion head of an extruder are attached to a preform die attached to the extrusion head through respective delivery passages of the preform die. An extrusion molding method in which a multi-layer extrudate is supplied to a die having a structure, and the plurality of types of extruded materials from each of the delivery passages are collectively merged at one location by the die to form a multi-layer extrudate formed into an integral multi-layer shape.