JPS6018435Y2 - Melt spinning equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a melt spinning device for thermoplastic synthetic fiber yarn.
More specifically, the present invention provides a melt spinning device that facilitates disassembly of a polymer transport pipe between a melting section of a high molecular weight polymer and a spinneret section, and has extremely good heat retention.

The present invention is particularly useful for spinning fiber yarns such as nylon 66, which are subject to severe thermal deterioration and decomposition of polymers, and require frequent disassembly and assembly to periodically incinerate or clean accumulated polymers. Suitable for certain melt spinning equipment.

In conventional melt spinning equipment, a polymer transport tube is installed inside the spin block in order to uniformly heat the polymer transferred from the melting section to the spinneret, and the spin block is heated by a heating medium such as dowsum. ing.

However, certain polymers, such as nylon 66
The fibers deteriorate and decompose severely and tend to adhere to the walls of the polymer transport tube and spin block tube, which are located in areas that are exposed to high temperatures and tend to accumulate during spinning, and such deteriorated or decomposed polymers are discharged from the spinneret. If it gets mixed in, it will cause a decrease in thread quality and thread breakage.

To prevent such problems, it is necessary to periodically remove accumulated polymer by incineration or washing.

An object of the present invention is to provide a melt spinning apparatus in which a polymer passage section such as a polymer transport tube can be disassembled during such removal work.

The present invention achieves this purpose by providing the polymer transport pipe outside the spin block, and also solves the problem of uniform heating caused by providing the polymer transport pipe outside the spin block. It has a special structure.

That is, in the present invention, a concave space is formed on the outer surface of a spin block containing a heating medium, and a polymer transport pipe for transporting molten polymer from a melting section to a spinneret section is disposed in the concave space, and the concave space is This is a melt spinning device in which liquid metal is filled around the polymer transport tube inside.

Further, in a preferred embodiment of the present invention, the bottom of the concave space and the on-off valve located at a position lower than the bottom are communicated by a discharge conduit, so that the liquid metal in the concave space is discharged when the polymer transport pipe is disassembled. It is discharged from the conduit through an on-off valve to allow easy and quick disassembly work.

In this case, a heater is provided around the discharge conduit to melt the liquid metal solidified in the discharge conduit at the start of discharge.

See attached drawings below 1. Examples of the present invention will now be described.

1 and 2, a spin block 1 is placed below a polymer melting section (not shown) such as an extruder.
has been established.

For example, on the upper surface of the spin block 1, the H shown in FIG.
A concave space 1a having an appropriate shape such as a letter shape is formed.

The illustrated embodiment is a melt spinning apparatus that distributes polymer from one polymer melting section to four spinneret sections for spinning, and a clamp joint 3 that divides the polymer into four parts, which communicates with the polymer melting section, is connected to a concave space 1a. It is located in the center.

The concave space 1 is connected between the clamp joint 3 and the four gear pumps 9 installed at the four ends of the H-shaped concave space 1a.
It communicates via a polymer transport pipe 5 and a valve block 7 disposed within a.

Furthermore, the gear pump 9 communicates with a spinneret section 11 (FIG. 2) comprising a back section and a spinneret.

The valve block 7 is designed to cut off the flow of polymer only to the necessary weights when replacing the gear pump 9 or the pack section, so that the replacement work can be performed in units of weights.

A sheath heater 13 is provided inside the spin block 1, and a heat medium 15 such as dowsome is sealed therein, so that the sheath heater 13 can heat the spin block 1 to a predetermined temperature.

The concave space 1a is filled with a liquid metal 17, that is, an easily fusible metal known as wood metal, dulse alloy, nilaton metal, rose metal, etc., which melts into a liquid state at a relatively low temperature, and the spin block 1 The polymer contacts the polymer transport pipe 5 in a molten state by receiving heat from the polymer transport pipe 5, thereby making it possible to maintain the polymer transport pipe 5 at a high temperature.

Further, a concave space 1a formed on the upper surface of the spin block 1
A discharge conduit 21 communicates from the bottom of the spin block 1 to the outside of the spin block 1, so that the liquid metal 17 in the four-shaped space la can be easily removed when the polymer transport tube 5 and the like are disassembled.

By positioning the distal end of the discharge conduit 21 lower than the bottom surface of the concave space 1a, the liquid metal 17 can be discharged by its own weight.

Further, it is preferable to provide an on-off valve 23 at the distal end side of the discharge conduit in order to control the storage and discharge of the liquid metal 17.

Note that if the distance between the bottom of the concave space 1a and the on-off valve 23 is sufficiently large, the liquid metal 1 blocked by the on-off valve 23
7 solidifies upstream thereof, which is preferable because it can prevent excessive weight of the liquid metal from acting on the on-off valve 23. However, on the other hand, when the liquid metal 17 is discharged, there is a problem of removing the solidified liquid metal 17.

As a solution to this problem, it is preferable to attach a heater 25 to the discharge conduit to melt the solidified liquid metal when the liquid metal 17 starts to be discharged.

In the present invention, a polymer transport tube is placed in a concave space formed on the outer surface of a spin block, and the liquid metal is filled around the concave space.

Therefore, during melt spinning, the heat of the spin block heated by the heating medium is efficiently and uniformly transferred to the polymer transport tube through the liquid metal, so that spinning can be performed without causing uneven heating of the molten polymer. can.

On the other hand, by discharging the liquid metal in the concave space, the melt spinning device of the present invention can easily and quickly disassemble and remove the polymer transport tube, which deteriorates periodically.
It is particularly preferable as a melt spinning apparatus for nylon 66, which requires removal and cleaning of decomposed polymers.

[Brief explanation of drawings]

FIG. 1 is a plan view of a melt spinning apparatus according to the present invention. FIG. 2 is a partially enlarged sectional view of FIG. 1. 1...Spin block, 1a...Concave space, 3...Clamp joint, 5...
...Polymer transport pipe, 7...Valve block,
9... Gear pump, 11... Spinneret part, 17... Liquid metal, 21... Discharge conduit, 23... Open/close valve, 25... Heater.

Claims (1)

[Claims for Utility Model Registration] 1. A concave space is formed on the outer surface of a spin block containing a heating medium, and a polymer transport pipe for transporting molten polymer from the melting section to the spinneret section is disposed within the concave space. and a liquid metal is filled around the polymer transport tube in the concave space. 2. The melt spinning apparatus according to claim 1, which includes a discharge conduit communicating with a bottom of the concave space and an on-off valve located at a lower position than the bottom. 3. The melt spinning apparatus according to claim 2, further comprising: a heater for heating the discharge conduit.