JPS60153197A - Method of producing synthetic resin sheet containing metal fiber - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a method for producing a synthetic resin sheet containing metal fibers used as an electromagnetic shielding material or a conductive plastic material in electrical or electronic equipment.

(Background technology) With the spread of various electronic devices and OA devices, these devices2
It has become a social problem that electromagnetic waves emitted by televisions, radios, microcomputers, etc., cause electromagnetic interference. This is due to the fact that the plastic casing of the above equipment does not have the effect of shielding against electricity.For this reason, there is a strong demand for plastics that are both conductive and inexpensive. As a countermeasure, a highly conductive synthetic resin in which metal fibers are dispersed in a synthetic resin is desired and is in practical use.

Conventionally, as a method for manufacturing synthetic resin pellets containing metal fibers, metal wool (continuous fibers) is first created by cutting gold wire, which is then cut into short fibers using a crusher, etc., and then the short fibers are cut into short fibers. and synthetic resin to create pellets.

However, 1. Metal wool cannot be cut with a cutter because it is pliable.It is cut with a crusher, but what you need to know after cutting
(There is a large variation in the length of l, and when mixing synthetic resin on short fibers, the length becomes short and the variation becomes large because it is cut with a screw, so the aspect ratio (thickness d and The ratio d/() to the length g cannot be made large,
1 limit is formed, the electromagnetic nord characteristics deteriorate and reproducibility becomes poor.

Furthermore, if the length of the short fibers exceeds the average length of 2+IIN, the fibers will intertwine and form a fiber ball shape when mixed with the synthetic resin. In addition, since the amount of short metal fibers mixed in is required to be 15% or more, the cost increases, and if the amount of mixed metal fibers is reduced, the strength decreases and the reinforcing effect is lost.

(Disclosure of the Invention) The present invention has been made to solve the above-mentioned problems, and since long metal fibers are mixed in the /-t and a large aspect ratio can be achieved, the electromagnetic shielding properties are great. The present invention aims to provide a method for manufacturing reproducible synthetic resin notebooks containing metal fibers in a continuous process at low cost.

In the present invention, a plurality of continuously cut metal wools are pressed against a polymer resin tape to form a carrier tape, and after coating the tape with liquid polymer resin, it is continuously cut into a predetermined shape. This is a method for producing a metal fiber-containing synthetic resin 7-t, which is characterized by heating and drying at 1" degree.

In the present invention, metal wool includes iron (steel) and copper.

be.

Hereinafter, the present invention will be explained by examples using the drawings. The figure is a side view for explaining an embodiment of the method of the present invention.

3 is a metal wool manufacturing device, in which multiple metal l112 wound multiple times around two capstans 3 are lined up in parallel and are continuously cut by a cutting tool 4 to produce multiple (for example, about 5
0 metal wools 6 are produced and taken up by the capstan 7.

5 is a presser plate.

A plurality of metal wools 6 are supplied onto a polymer resin tape 8 drawn out from a supply device 9, and are applied to a pressure roll IO.
The carrier tape 11 is then pressed against the tape 8.

The carrier tape 11 is placed on a conveyor belt 12 and transported. A hopper 13 is provided on the conveyor belt 12, and a liquid polymer resin (eg, liquid polyethylene resin) 14 is flowed out from an appropriate gap between the hopper 13 and the tape 11 to coat the carrier tape 11. The carrier tape 11 coated with resin I4 is squeezed by a slit plate 15 fixed to the tape 11 at an appropriate distance to form a sheet with an appropriate thickness, and then placed in a drying oven 16.
The liquid polymer resin is heated to a predetermined temperature to remove the volatile organic agent in the liquid polymer resin and solidified, and then it is subsequently cooled or
The metal fiber-containing synthetic resin sheet 18 is continuously manufactured by flattening by pressure using the metal fiber sheet 17.

In this case, multiple pieces of wool 6 that have been washed continuously
can be incorporated into the product without being cut midway through, so
Because the fiber length is long and the aspect ratio is large,
Great electromagnetic shielding effect.

In addition, since production from metal wool production to 7-piece production can be carried out in one process, the process is continuous and costs are reduced.

(Example) A synthetic resin notebook containing brass fibers was prepared by the method of the present invention shown in the figure.

A brass wire was supplied to the metal wool manufacturing apparatus 1 and continuously cut into a 200-thick brass fiber having a thickness of about 50 μW.

This was supplied onto a polyacetal tape (8) having a width of 50 cm and a thickness of 50 μm, and was pressed by a pressure roll 10 to obtain a carrier tape 11.

A polyethylene resin liquefied with organic solvent Kinle/ is supplied to the hopper 13, and after flowing out from the hopper 13 onto the carrier tape to cover it, a width of 5 (lII +
11 Squeezed using a slit plate I5 with a vertical interval of 1 to form a notebook using the same method, followed by solidification in a drying oven I6, and pressurized with a roll 17 to create a brass fiber-containing synthetic resin sheet 18 having a width of 50+IIM1 and a thickness of 1+IIN. .

The resulting notebook has a width of 50IIffi and a length of 200111
Put together 4 pieces cut into 1, stack 2 of these at right angles, and heat-form with a hot press (200℃) to make 20 pieces.
A sheet of 0w x 200cm x 2II11 thickness was prepared.

For comparison, we created a sort using the same month method using the conventional method.

The mixing rate of short brass fibers was set to +5 vol%.

The volumetric resistance of each sheet was as follows.

Present invention: 0.8 Ωc11 Conventional example: 98 ΩcW1 It was found that the material according to the present invention has extremely superior conductivity compared to the conventional example.

(Effects of the Invention) The method for producing a metal fiber-containing synthetic resin notebook of the present invention configured as described above has the following effects.

(b) A carrier tape is created by pressing a plurality of continuously cut metal wools onto a polymer resin tape, and after coating the tape by flowing liquid polymer resin, it is continuously heated to a predetermined temperature. Since the product is heated and dried in a single step, long product sheets can be continuously produced in one process, making production easy and reducing costs.

(b) Long, continuous metal fibers can be incorporated into products without being cut midway through, so synthetic resin sheets containing metal fibers Xfl can be created with a large aspect ratio, excellent electromagnetic/ird properties, and reproducibility. Can be manufactured.

[Brief explanation of the drawing]

The figure is a side view for explaining an embodiment of the method of the present invention. 1... Metal wool manufacturing device, 2... Metal wire, 3, 7
... Capstan, 4... Cutting tool, 5... Presser plate, 6... Metal wool, 8... Polymer resin tape,
9...Sub I2...Conveyor belt, 13...Hosoha-114...Liquid polymer resin, 15...Slit plate, IG...Drying oven, 17...Roll, +8...
・Synthetic resin sheet containing metal fibers. Agent: Patent Attorney Hideyo Aoki, Proceeding for the Mentally Deaf, Amendment: Date of Otsu, Month, 1989 1, Indication of the Case: 1982 Patent Application No. 9315 2, Title of Invention: Method for Manufacturing Synthetic Resin Sheets Containing Metal Fibers 3 , Relationship with the case of the person making the amendment Patent applicant address 5-15 Kitahama, Higashi-ku, Osaka Name (213)
Sumitomo Electric Industries, Ltd. 5, date of amendment order 6, specification subject to amendment, scope of claims, and detailed description of the invention. 7. Contents of amendment (1) The scope of claims in the specification will be corrected as shown in the attached sheet. (2) In the specification, page 5, line 4, "volatile organic agent" is corrected to "volatile organic solvent." (3) In the specification, page 5, line 5, "continued cooling roll" is corrected to "continued rolling roll". (4) In the specification, page 5, line 7, the next line after “Produced continuously.” Molecular resin (preferably the same quality as the polymer resin tape for carrier tape) can also be used.'' (5) Specification, page 7, lines 6 to 8, ``After coating, it is continuously heated and dried at a predetermined temperature, so in one step'' is replaced with ``After coating and curing, "Because it is rolled by rolls that are continuously maintained at a predetermined temperature." Claims: ``(1) A carrier tape is obtained by pressing a plurality of continuously cut metal wools onto a polymer resin tape, and a liquid polymer resin is flowed over the tape to form a fiber-containing synthetic resin. Seat manufacturing method.”

Claims (1)

[Claims] (1) A carrier tape is made by pressing a plurality of continuously cut metal wools onto a polymer resin tape, and after coating the tape with liquid polymer resin, it is continuously heated to a predetermined temperature. 1. A method for producing a synthetic resin containing metal fibers, which comprises heating and drying the metal fiber-containing synthetic resin.