JPS5838311B2 - Multi-core co-extruder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a multi-core coextruder that extrudes independent coatings onto a plurality of core wires.

This type of extruder consists of a nipple having a plurality of core wire through holes and a gouer having a plurality of die outlets aligned with these core wire through holes, and the plurality of core wires are passed through each core wire through hole of the nibble. Upon exiting the die, each independent coating is extruded (see Utility Model Publication No. 49-411.91).

This type of extruder has the advantage of high extrusion capacity and significantly improved productivity, but it is difficult to precisely align all the core wire through holes of the triple and all the die outlets of the die.
・Has a drawback.

That is, when one core through-hole and its corresponding die exit are centered, the other core through-holes and their corresponding die exits tend to be out of alignment; Centering is done by the shape of the nipple and die,
Because of complex factors such as relative position, extrusion material, temperature, and pressure, it is almost difficult to center all the core wire through holes and the die exit equally.

An object of the present invention is to provide a multi-core coextruder in which all the die outlets of the die can be precisely aligned with all the core wire through holes of the nipple.

Embodiments of the present invention will be described in detail with reference to the drawings.
The figure shows the main parts of a twin-core coextruder 10 according to the present invention, and this extruder 10 has a crosshead as well as a nipple 12 installed in a cylindrical crosshead body (not shown) that communicates with an extruder body (not shown). It consists of a die 14 mounted within the body.

As shown in FIGS. 2A to 2C, the doublet 12 has two independent core wire through holes 16A and 16B therein, and a fork-shaped tapered end portion 18A that surrounds each of the core wire through holes 16A and 16B. , 18B.

The nipple 12 is attached to the crosshead body by screwing the rear end small diameter threaded portion 12a onto the crosshead body.

The die 14 also has two die chambers 22 separated by a partition wall 20 near the exit, as shown in FIGS. 3A to 3C.
A, 22B, and these evening rooms 22A, 2
2B has die exits 24A and 24B that are aligned with each other (see Fig. 4).

The die 14 is attached to the crosshead body by a suitable means (not shown) at a shoulder 14a.

As seen in FIG. 3B, the forked tapered ends 18A, 18B of nipple 12 are disposed concentrically within each die chamber 22A, 22B.

As shown in FIG. 1, the two core wires IA and IB are inserted into the core wire through holes 16A and 16B of the nipple 12, the die chamber 22A,
Resin is deposited and molded from the die exits 24A and 24B through the interior of the resin 22B, and the coatings 2A and 2B are applied thereon.

The die 14 has two sliding die members 26A, 26B each having a die outlet 24A, 24B, as shown in more detail in FIGS. 4 and 5, respectively. It is adjustable and held in a holding hole 28 extending across the two die chambers 22A and 22B on the front surface of the die chamber 14.

Accordingly, the two die outlets 24A, 24B can each be moved along the retaining hole 28 and finely adjusted independently to center on the corresponding core through hole 16A, 16B of the nipple 12.

These slide die members 26A, 26B can be fixed in predetermined positions by set screws 30A, 30B screwed in from the front of the die 14, respectively.

It is preferable that these slide die members 26A, 26B be made of a metal material with a high coefficient of thermal expansion, since this will prevent the center alignment from going out of order.

In the above embodiments, a two-core coextruder was described, but the present invention can be similarly applied to an extruder that simultaneously extrudes three or more cores.

According to the present invention, as described above, the positions of the plurality of slide die members each having each die outlet can be adjusted independently in front of the die, so that each core wire through hole of the nipple is fitted with the corresponding die. There is a practical benefit in that the exits can be precisely aligned and therefore high-quality extruded products with less deflection can be mass-produced.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of the main parts of a multicore coextruder according to the present invention, FIGS. 2A to C are horizontal sectional views, vertical sectional views, and front views of the nipple, and FIGS. horizontal section,
Vertical sectional view and front view, FIGS. 4 and 5 are front views and sectional views of essential parts of the present invention. IA, IB・1・・Single core wire, 2A, 2B・・・・One coating, 10・・・・・One coated core coextruder, 12・・・・・−
Nipple, 14...-Die, 16A, 16B...
・Single wire through hole, 24A, 24B---Die exit, 26A, 26B---Slide die member, 28
...One...One holding hole.

Claims (1)

[Claims] 1 Consisting of a nipple having a plurality of core wire through-holes and a goo having a plurality of die outlets aligned with the plurality of core wire through-holes, the plurality of core wires passing through the plurality of core wire through-holes of the two twine A multi-core co-extruder is configured to extrude each independent coating, wherein the die has a plurality of slide die members each having a respective one of the plurality of die exits, and the slide die member has a plurality of slide die members each having a respective one of the plurality of die outlets; A multi-core simultaneous extruder characterized in that the cores are adjustable and held in the holding holes of the core.