JPH06210702A - Preformer - Google Patents

Abstract

PURPOSE:To simply perform attachment and detachment and to facilitate production by providing an intermediate split member having a unifying passage between a rear surface split member having a plurality of inflow holes for different materials and a front surface split member having an outflow hole allowing the materials to flow out in a unified state and forming the whole into a freely splitting and assembling block. CONSTITUTION:A rear surface split member 17 having four inflow holes 13, 14, 15, 16 permitting different materials to flow in, a front surface split member 17 having an outflow hole 18 allowing the materials to flow out in a unified state and an intermediate split member 20 having a passage unifying the materials entering from the inflow holes 13-16 are provided and the whole of them is formed into a freely splitting and assembling block. That is, the materials flowing in from the inflow holes 14, 15 are allowed to meet with each other in a confluent part 21 and further allowed to meet with the material from the inflow hole 13 in a confluent part 22. The outflow hole 18 of the front surface split member 19 allows three kinds of the materials from the inflow holes 13, 14, 15 and the material from the remaining inflow hole 16 to meet with each other. The respective split members 17, 20, 19 themselves become a splitting and assembling structure and, by this constitution, passages are easily processed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a preformer used in a composite extrusion molding apparatus in which a plurality of materials such as rubber and resins are separately supplied and integrally extruded.

[0002]

2. Description of the Related Art Conventionally, JP-A-56-144145 has been known as this type of preformer. There, two kinds of materials are joined together at an inlet hole on the rear surface of the preformer.

However, the number of materials to be composited is 3
When the number of types is more than one, it is not possible to accurately maintain the blended (merged) shape by combining them all at once in the inflow hole on the rear surface of the preformer.

Therefore, the present inventors manufactured a preformer as shown in FIG. 8 and repeated the experiment.

That is, in FIG. 8, a four-layer preformer is shown, which has a rear surface on the right side and has inflow holes a ... The left side is the front surface, and on the front surface, the four flow paths b ... Are merged together at one time.

A cap is attached to a recess c on the front side on the left side of FIG.

[0007]

However, it has been found that the preformer shown in FIG. 8 has the following problems.

The weight of the preformer as a whole is about
It was about 30 kg, and it was difficult for the worker to attach or remove to the compound extruder.

Since each flow path b is long, it is difficult to process the mold. Therefore, the number of manufacturing days is increased and the cost is increased.

It is extremely difficult (because the flow path b is long) when cleaning the rubber and the resin contained in the flow path b is required.

The present invention solves these problems and
To provide a preformer that can be easily installed and removed by an operator by hand, and to provide a preformer that is easy to manufacture, has a short delivery time, and is low cost, and further removes the material in the flow path. The purpose is to provide an easy preformer.

[0012]

In the preformer according to the present invention, a rear surface divided body having a plurality of inflow holes into which different materials flow and a different material flowed in through the above-mentioned inflow holes are discharged together. A front divided body having individual outflow holes, and an intermediate divided body having a flow path interposed between the rear divided body and the front divided body and having a flow path for appropriately combining different materials in the inflow holes , And the whole is configured as a block that can be divided and assembled.

Further, a rear surface divisional body having a plurality of inflow holes into which different materials flow in, a front surface divisional body having one outflow hole through which the different materials flown in through the inflow holes are discharged in a combined state, A rear surface division body and an intermediate division body interposed between the front division body, and the whole is in the form of a block that can be divided and assembled; At the joining position, a merging portion for merging and sequentially merging the different materials one by one is arranged.

[0014]

Since the rear divided body, the intermediate divided body, and the front divided body can be separately assembled, they can be attached or detached (to the central discharge head of the composite extrusion molding device) in a divided state. Can be easily done by hand.

Further, the length of the flow path to be processed by each divided body is shortened, processing of the flow path is significantly facilitated, and the material smoothly flows without staying on the inner surface and the extrusion shape is accurate. It is possible to make the cross-sectional shape of the channel.

In addition, since the different materials are sequentially merged and merged one by one at the joining positions of the respective divided bodies, the merged portion can be easily processed and the shape of the blended mixture is accurate.

[0017]

The present invention will be described in detail below with reference to the illustrated embodiments.

FIG. 3 shows an embodiment of the preformer 1 in cross section, and FIG. 1 shows a composite extrusion molding apparatus using the preformer 1. 2 shows the disassembled state of the device.

First, referring to FIGS. 1 and 2, 2 is a box insert into which the preformer 1 is detachably fitted, 5 is a united box, and a fixed box 3
And a plurality of moving boxes 4 ...

The fixed box 3 has a recess 6, in which the box insert 2 is fitted.

Reference numeral 7 denotes a plurality of extruders, and the moving boxes 4 are fixed to the discharge ends of the extruders 7 to form units U1, U2, U3 and U4 (as shown in FIG. 2). There is.

As described above, the concentrated discharge head 8 is composed of the fixed box 3, the moving box 4, ..., The box insert 2, the preformer 1 and the like, and a plurality of concentrated discharge heads 8 are provided. The extruder 7 is attached.

Moreover, since the box 5 is a united type,
(As shown in FIG. 2), each extruder 7 and the moving box 4 are configured as units U1, U2, ... Removable from the fixed box 3.

By the way, the moving box 4 has an inner surface shape for the rubber and resins discharged from the extruder 7 in the most stable state and allows the extruded shape to be easily determined, and the outer surface has a tapered tip surface 9 And is attached to the rear surface of the fixed box 3 by being inserted into a tapered insertion hole 10 that is formed on the opening side of the rear surface of the fixed box 3.

The fixed box 3 has a recess 6 on the front surface side (as described above), and the insertion holes 10 ... Communicating from the rear surface side to the bottom surface of the recess 6 are formed therethrough.

The fixed box 3 serves as a reinforcement against the internal pressure generated in the moving box 4 in the state shown in FIG. That is, when the moving boxes 4 ... Are inserted into the insertion holes 10 ...
The moving box 4 receives the internal pressure of rubber or resin and tries to elastically deform in the radial direction, but receives it.

The fixed box 3 is kept at a constant temperature by hot water, a heater, or other means (not shown).

Next, the box insert 2 has a recess 2a into which the preformer 1 is fitted, and a passage 11 communicating from the bottom surface to the rear surface--the side corresponding to the bottom surface of the recess 6--. The materials such as rubber and resins discharged from the tip of the moving box 4 are penetrated by the preformer 1
It is a jig to send to.

The box insert 2 is also preferably temperature-controlled (not shown).

Thus, the preformer 1 is a composite extrusion molded product made of a material such as rubber or resin extruded from the plurality of extruders 7 ... and sent through the passages of the box 5 and the box insert 2. It is a jig for distributing to a predetermined position, and it is desirable to have a shape and structure as shown in FIG. 3, for example.

That is, in FIGS. 1 and 2 described above, the concentrated discharge head 8 in which four kinds of materials are combined is illustrated, but in FIG. 3 as well, four kinds of materials are combined (for four layers) in accordance with this. The reformer is illustrated.

As shown in FIG. 2, the preformer 1 is detachable, and a plurality of preformers 1 as shown in FIG.
It is easy to deal with various products if it is selectively used from the set.

In this way, by the preformer 1,
Combining multiple materials into required layout and required cross-sectional shape,
Composite extrudates can be made.

In the present invention, the vulcanization of the rubber material or the crosslinking reaction of the resins may be carried out in any step. For example, it may be carried out through another vulcanization / crosslinking line after being extruded by the composite extrusion molding apparatus of the present invention, or shear heat generation is carried out in each extruder 7 ... But good.

Further, in the present invention, the extruder 7 includes a case where a shearing heat generator is connected to the discharge end of the extruder.

Therefore, in FIG. 2, U4 'indicates a spare unit, in which one unit U4 which has extruded one material is stopped and pulled out from the fixed box 5, and another material is extracted. Unit U for Spare for Extruding
If 4'is attached to the fixed box 5, the feed material can be changed (rubber replacement) quickly. Of course, other units U1, U
With respect to 2 and U3 as well, a spare unit is prepared in advance, and rapid material change (rubber change) can be realized.

Although not shown in FIGS. 1 and 2, the units U1, U2, ... Are integrated (including the speed reducer and the motor) into one unit, and a hydraulic cylinder, a drive motor and a ball screw are used. It is desirable to provide a reciprocating mechanism so that the spare unit can be quickly replaced.

As described above, the embodiments shown in FIGS. 1 and 2 are suitable for various kinds of small-quantity production, when the feed materials are frequently changed, and when the small extruder 7 ... Is used. It can be said that there is.

Next, the preformer 1 shown in FIG. 3 will be described in detail.

This preformer 1 is made of different materials--
── Four inflow holes 13 and 1 for rubber and resin ───
A rear surface division body 17 having 4, 15, 16 and a front surface division body 19 having one outflow hole 18 for allowing the different materials to flow out in a combined state, and an inflow hole 13, which is interposed between them. 14,
An intermediate division body 20 having a flow path for appropriately combining the materials entered from 15 and 16 is provided, and the whole is in a block shape that can be divided and assembled.

More specifically, the inflow hole 14 and the inflow hole
The material flowing from 15 merges at the joining position B between the rear surface divided body 17 and the intermediate divided body 20 so as to merge together.
21 are provided.

Then, the mutual joining position A between the intermediate division body 20 and the front division body 19 is formed so that the material merged and merged at the merge portion 21 and the material from the inflow hole 13 are merged and merged.
, Another merging portion 22 is provided.

In addition, the outflow hole 18 on the front side of the front divided body 19
Is a combined material of three types (layers) from the inflow holes 13, 14, and 15,
A merging section for merging and merging the materials from the remaining inflow holes 16
Is formed into 23.

As described above, the preformer 1 serves to merge and combine the materials extruded from each of the extruders 7 (in FIGS. 1 and 3) one by one. .

Since the merging portions 21, 22, 23 are formed,
In the embodiment of FIG. 3, the V-shaped blocks 24, 25, 26 are respectively
It is used for the rear surface division body 17, the intermediate division body 20, and the front surface division body 19. That is, each divided body 17, 20, 19 itself has a divided assembly structure. This facilitates the processing of the flow path.

Next, a more detailed description will be given with reference to FIGS.

FIG. 4 shows another embodiment, which is an alternative to FIG. 3, in cross section. Although the preformer 1 of FIG. 4 can be applied to products of various shapes, as an example, the case of molding the sidewall 27 of the tire shown in the cross-sectional view of FIG. 6 will be described below.

This side wall is composed of four (4 layers) parts as shown in FIG. 6, and the (rubber) material of each part is the inflow hole of the rear surface dividing body 17 as shown in FIG.
Inflow from 13, 14, and 16. In particular, in the embodiment of FIG. 4, the inflow hole 14 on the rear surface of the rear surface split body 17 constitutes the confluence portion 21a.

At the merging portion 21a, the parts of FIG. 6 and the (rubber) material of the parts are united, and as shown in FIG.
Make layers.

By the way, (a), (b), ... (g) in FIG.
It is a figure which also shows the outline of the cross-sectional shape of the flow path (a) (b) ... (g) of (or FIG. 5 mentioned later).

As is apparent from FIG. 4 and FIG. 7, the site material that has passed through the flow channel (a) merges with the site material that has passed through the flow channel (b).

The merging portion 22a where the merging and merging is performed is the mutual joining position B of the rear surface divided body 19 and the intermediate divided body 20.

In this merged and merged material, the material flowing in the flow path (d) forms the three layers shown in FIG. 7 (d). The materials of the three layers are (inflow hole 16 → flow path (c) → flow path) at the joining portion 23a at the mutual joining position A of the intermediate division body 20 and the front division body 19.
(E) It merges with the material that just flowed.

That is, the distribution shape of four layers as shown in FIG.

Thereafter, as shown in FIG. 4, the base 29 fitted in the front recess 28 of the front divided body 19 is formed into the product (sidewall) shape shown in FIG. 7 (g) and FIG.

As described above, although simplified in FIG. 4 (and FIGS. 3 and 5), the flow path inside has a flat cross section as shown in FIG. (Of course, other various channel cross-sections are possible depending on the product to be extruded.)

Also, the V-shaped block 24 used in FIG.
Instead of 25 and 26, in FIG. 4, rectangular blocks 32 and 33 carved from a rectangular parallelepiped plate are used. This square block
32 and 33 have the advantage of excellent durability.

Next, in another embodiment shown in FIG. 5, the outer two (for material) inflow holes 1 among the four passages 11 ...
3 and 16 are provided on the chamfered portions 34 and 34. (Other than that, the same reference numerals are the same as those in FIG. 4, and thus the description thereof is omitted.)

As described above, the chamfered portions 34, 34 are formed on the rear surface divided body 17
By forming the inflow holes 13 and 16 therein, the overall weight and size are reduced, and the lengths of the respective flow paths are equalized.

The following Table 1 is based on the preformer shown in FIG. 5 as a reference 100, and the weight, production cost, production days, and remodeling days of the preformers shown in FIGS. 3, 4 and 8 are set constant. It is shown.

[0061]

[Table 1]

In Table 1, the integrated preformer shown in the comparative example of FIG. 8 has the lightest weight, but since it cannot be divided, it is difficult to handle it by hand. On the other hand, in the product of the present invention shown in FIGS. 3, 4 and 5,
Since it is divided into three or more, its handling is easy.

According to the embodiment shown in FIGS. 1 and 2 of the present invention, a single extrusion molding apparatus can efficiently produce a small amount of composite extrusion molded articles of various shapes and materials. it can. Further, the units U1, U2, ... Can be replaced quickly, and the extrusion line can be prevented from being stopped for a long time. And,
The area around the box 5 is simplified and easy to handle.

The present invention is not limited to the above embodiment, and its design can be changed freely. For example, it is possible to have three layers, or five or more layers. And the intermediate division 20 is 2
It may be more than one. Also, taking a tire as an example, the tire can be freely used for a tread, a bead apex, or a composite extruded product of other parts.

[0065]

The present invention has the following great effects.

Since the whole can be divided and assembled, it can be manually lifted and attached to the composite extrusion molding apparatus.
It will be easier to remove.

Processing of a complicated flow path to be formed inside is significantly facilitated (because of the divided structure), and the number of manufacturing days, the number of remodeling days, and the manufacturing cost can be reduced.

Since the merging portion can be formed inside the preformer, it is possible to particularly extrude four or more layers of material into an accurate material distribution shape. This can improve the performance and quality of the product obtained.

It is easy to remove and clean the material clogged in the internal flow path.

(According to claim 2)
In addition, at the joint positions A and B, the merging portions 21, 22, 21
Since a and 22a are provided, it is possible to easily process even a complicated and delicate shape. Therefore, the distribution shape of the material can be stably and highly accurately determined (see FIGS. 7D and 7F).

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view for explaining a disassembled state.

FIG. 3 is a cross-sectional view of an example of a preformer.

FIG. 4 is a sectional view of another embodiment of the preformer.

FIG. 5 is a cross-sectional view of another embodiment of the preformer.

FIG. 6 is a cross-sectional view showing an example of a composite extrusion molded product.

FIG. 7 is an explanatory diagram showing a compounding shape of a material in each channel cross section.

FIG. 8 is a cross-sectional view showing a preformer of a comparative example.

[Explanation of symbols]

 13 Inflow hole 14 Inflow hole 15 Inflow hole 16 Inflow hole 17 Rear divided body 18 Outflow hole 19 Front divided body 20 Intermediate divided body 21 Merging portion 21a Merging portion 22 Merging portion 22a Merging portion A Mutual joining position B Mutual joining position

Claims (2)

[Claims] 1. A rear surface divided body having a plurality of inflow holes into which different materials flow, a front surface divided body having a single outflow hole through which the different materials flowing in from the inflow holes are discharged in a combined state, A block-shaped body which is provided between the rear surface divided body and the front surface divided body, and which has an intermediate divided body having a flow path for appropriately combining different materials in the inflow holes, and which can be divided and assembled as a whole. A preformer characterized by being configured into. 2. A rear surface divided body having a plurality of inflow holes into which different materials flow, and a front surface divided body having a single outflow hole through which the different materials flown from the inflow holes are discharged in a united state. A rear surface divided body and an intermediate divided body interposed between the front divided body, and the whole is in the form of a block that can be divided and assembled, and the rear surface divided body, the intermediate divided body,
A preformer, characterized in that a merging portion for merging and merging the different materials one by one is provided at a mutual joining position of the front divided bodies.