JP2003251674A - Method for removing deposit on core metal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress loss of products caused by a sheath cob generated by deposits on a core metal to a minimum. <P>SOLUTION: An extruder 5 is provided with an extrusion part 7 for melting a coating material 6, a heat 8 for guiding the coating material 6 extruded from the extrusion part 7 in the cable forwarding direction, and a nozzle 9 and a core metal 11 provided on this head 8 and for applying the extruded coating material 6 to fit the shape of a cable core 2. At the front stage of an extrusion line 1 of the extruder 5, a deposit removing member winding machine 17 which winds a deposit removing member 16 for removing core metal deposits 15 deposited on the core metal 11 on the cable core 2 is provided, and the core metal deposits 15 are spontaneously removed by the deposit removing member 16 wound at an arbitrary position of the cable core 2 by the deposit removing member winding machine 17. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing deposits on a mandrel for removing deposits on a mandrel attached to a mandrel of an extruder.

[0002]

2. Description of the Related Art Conventionally, a three-layer type extruder as shown in FIG. 3 has been used as a countermeasure against the deposit on the core of the extruder.

This extruder 51 has a main extrusion section 52,
It has sub extrusion parts 53 and 54 on both sides thereof. The main extrusion part 52 and the sub extrusion parts 53 and 54 are connected to a head 55 for guiding the coating material extruded from the extrusion part in the traveling direction of the cable. The head 55 is provided with a die (die) 56 and a core (nipple) (not shown) for coating the extruded coating material in conformity with the shape of the cable core 61.

The material from which deposits are generated is extruded from the main extrusion section 52, while the material from which deposits are not generated is extruded from the sub extrusion sections 53 and 54. That is, the inner coating layer 57 and the outer coating layer 59 that do not generate the deposits suppress the generation of the deposits on the base 56 and the mandrel by sandwiching and extruding the intermediate coating layer 58 that generates the deposits. Was becoming.

[0005]

By the way, in order to extrude three layers by the above-mentioned extruder 51, it is necessary to secure the thickness of the inner coating layer 57 and the outer coating layer 59, so that the outer diameter of the cable is increased. Alternatively, the thickness of the intermediate coating layer 58 must be reduced.

However, if the thickness of the intermediate coating layer 58 cannot be reduced due to the limitation of the cable size or the characteristics of the cable, the thicknesses of the inner coating layer 57 and the outer coating layer 59 should be secured. Cannot be performed, and three-layer extrusion becomes impossible.

When the coating is carried out without performing the three-layer extrusion, the deposit on the mandrel gradually grows from the tip of the mandrel to the inside, and when it becomes large, it is caught by the cable core 61 and a sheath cob is generated at an unspecified place. Therefore, there is a problem that the product loss becomes large when the product is separated in the subsequent process.

Therefore, the present invention has been devised to solve the above problems, and an object of the present invention is to remove the deposit on the core metal which can minimize the product loss due to the sheath cob generated by the deposit on the core metal. To provide a method.

[0009]

[Means for Solving the Problems] To solve the above problems,
The present invention provides an extruding section for melting a coating material, a head for guiding the coating material extruded from the extruding section in a cable traveling direction, and an extruding coating material provided on the head in accordance with the shape of a cable core. In front of an extrusion line of an extruder equipped with a spinneret and a mandrel for coating, an adhering matter removing member winding machine for winding an adhering matter removing member for removing an adhering matter depositing on the mandrel attached to the mandrel is provided. The deposit removing member is a method for removing deposits of a mandrel, wherein the deposit removing member is wound around an arbitrary position of the cable core by a winding machine to remove the deposits of the mandrel spontaneously. .

According to the above method, the deposit removing member is wound around an arbitrary position of the cable core to spontaneously remove the deposit on the mandrel, so that the position where the sheath cob is generated can be controlled. Product loss can be minimized.

Then, a method for removing deposits on a mandrel, wherein the deposit removing member is composed of a string, rubber, tape or the like, and is wound around the cable core in a portion to be cut in a post process of the extrusion line. preferable.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic configuration diagram showing an extrusion line for carrying out the method of removing deposits on a mandrel according to the present invention, and FIG. 2 is a sectional view showing a main part of an extruder.

First, the structure of an extrusion line for carrying out the method for removing deposits on a mandrel according to the present invention will be described.

As shown in FIG. 1, the extrusion line 1 has a feeder 3 for feeding the cable core 2 and a length counter 4 for counting the length of the fed cable core 2. An extruder 5 for covering the cable core 2 is provided between the feeder 3 and the length counter 4.

The extruder 5 is provided with an extrusion section 7 for melting a coating material (see FIG. 2), a head 8 for guiding the coating material 6 extruded from the extrusion section 7 in the cable traveling direction, and a head 8 for this head. Die for covering the extruded and extruded coating material 6 according to the shape of the cable core 2
9 and a mandrel (nipple) (see FIG. 2) 11.

As shown in FIG. 2, a flow path 12 for the coating material 6 is formed in the head 8, and a cap 9 having a hole 14 formed at the tip thereof and having the same diameter as the outer diameter of the cable is formed. It is provided. The mandrel 11 is formed in a tubular shape to cover the cable core 2 and is provided in the flow path 12. The tip of the mandrel 11 is tapered toward the hole 14 of the base 9 so that the outer peripheral surface thereof maintains a predetermined clearance with the inner peripheral surface of the base 9.

By the way, in the extrusion line 1 according to the present embodiment, as shown in FIG. 1, in front of the extrusion line 1 of the extruder 5, the removal of deposits 15 for removing the deposits 15 of the core metal attached to the core 11 is performed. An attachment removing member winding machine 17 for winding the member 16 around the cable core 2 is provided.

In the present embodiment, the adhered substance removing member 16 is composed of a silicon tube formed by winding a heat resistant silicon tape such as Teflon (registered trademark), urethane or propylene. The adhered substance removing member 16 is not limited to the silicon tape, and may be a string, rubber, or another type of tape as long as it has heat resistance.

As the adhering substance removing member winding machine 17, a taping machine for winding a tape such as a vinyl tape is applied, and a silicon tape is automatically or manually wound.

The deposit removing member winding machine 17 is electrically connected to the length counter 4 so as to wind the deposit removing member around an arbitrary position of the cable core 2 according to the amount of the cable core 2 delivered. Has become.

Next, the procedure of the method for removing deposits on the cored bar, which is carried out by the extrusion line 1 having the above-described structure, and its operation will be described.

First, the extruder 5 is used to move the cable core 2
At the same time as the coating is started, the length counter 4 starts counting the amount of the cable core 2 delivered. At the same time, the length of the coated cable 18 to be cut in the post process of the extrusion line 1 is known.

Then, the cable core 2 is divided by the cut length.
When the sheet is sent out, the attached matter removing member winding machine 17 winds the attached matter removing member 16 around the cutout portion of the cable core 2.

The adhered substance removing member 16 is sent together with the cable core 2 into the mandrel 11 and moves by catching the mandrel attached substance 15 gradually grown at the tip of the mandrel 11.
Then, the core metal deposit 15 removed from the core metal 11 is coated with the coating material 6 together with the cable core 2.

A sheath cob is generated at this location, but since this is a cut portion, it can be cut and removed in a later step, and a covered cable 18 having a length required in advance is obtained. be able to.

In short, conventionally, a sheath cob is generated at an unspecified place, and thus a large product loss is generated at the time of cutting in a later step, whereas in the present invention, the core metal deposit 15 is arbitrarily removed. By voluntarily removing the coated cable 18 at a position, the coated cable 18 having a desired length can be manufactured, and product loss can be significantly reduced.

Specifically, in the case of EM-HUTP using the sheath material PE3759, the unit price is 47 yen / m, the production amount is 167.5 km / month, and the sheath cob occurrence rate is 11.5%.
Therefore, the product loss is 47 (¥ / m) * 167.5
(Km / month) * 0.115 = 905 (k ¥ / month).

As described above, according to the present invention, the product loss can be significantly reduced even if there are restrictions on the size of the cable, so that the cable can be efficiently manufactured under a wide range of conditions. It becomes possible.

[0030]

In summary, according to the present invention, the deposit removing member is wound around an arbitrary position of the cable core to spontaneously remove the deposit on the mandrel, so that the position where the sheath cob is generated can be controlled. It has an excellent effect of minimizing product loss due to sheath cob.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an extrusion line for carrying out a method of removing deposits on a mandrel according to the present invention.

FIG. 2 is a sectional view showing a main part of an extruder.

FIG. 3 is a sectional view showing a three-layer type extruder.

[Explanation of symbols]

1 Extrusion line 2 cable core 5 extruder 6 coating material 7 Extruder 8 heads 9 mouthpiece 11 Shinkin 15 Shinkin attachment 16 Mandrel deposit removal member 17 Mandrel deposit removal member winding machine

Claims (2)

[Claims] 1. An extruding section for melting a coating material, a head for guiding the coating material extruded from the extruding section in a cable advancing direction, and an extruding coating material provided on the head adapted to the shape of a cable core. In the former stage of the extrusion line of an extruder equipped with a spinneret and a mandrel for covering the mandrel, an adhering substance removing member for winding an adhering substance removing member for removing an adhering substance attached to the mandrel is wound around the cable core. And a mandrel characterized in that the adhering substance removing member is wound around the cable core at an arbitrary position by the adhering substance removing member winding machine to spontaneously remove the adhering substance. How to remove deposits. 2. The mandrel according to claim 1, wherein the deposit removing member is made of a string, rubber, tape, or the like, and is wound around the cable core in a portion to be cut in a subsequent step of the extrusion line. How to remove deposits.