JPS6185683A - Manufacture of floppy disk liner - Google Patents

Abstract

PURPOSE:To realize a liner material excellent in abrasion resistance without a nap, etc., by forming a web which contains 5-70% of fibers composed of two components having a melting point difference of >=20 deg.C, heat treating at a prescribed temperature with no-pressure and finally thermocompression bonding them. CONSTITUTION:A compound fiber which is the combination of the low melting point component and high melting point component whose melting point difference is >=20 deg.C, such as polyethylene and polypropylene, for instance, is prepared, and the web for containing 5-70% of said fiber is formed. This web is heat treated with no-pressure at a temperature of the melting point of the low temperature component or higher and that at a temperature below the melting point of the high melting point component. Since the liner material formed in this manner has fibers jointed in a bulky state at a non-compression bonded part, a material with excellent in abrasion resistance with no nap, etc., can be obtained without losing good cushion performance and flexibility.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention is directed to a method for producing a liner material that is lined in a jacket for storing a floppy disk and used for cleaning the surface of the disk.

(Conventional techniques and their problems) Conventionally, the main materials used for floppy disk liner materials are rayon - 570 to 80% λ% and polypropylene - 20% to 30% λ% fibers, which are processed using an embossing calender, etc. It is attached by partially thermo-compression bonding.

However, the liner material produced by this method is blended with polypropylene components in the Tsubame crimping process, and the polypropylene fibers at the edges of the thermocompression bonding are subjected to heat close to their melting point. Because it is,
Due to the shearing force applied from rolls etc. during the process, A fibers tend to break, and non-thermal pressure AII for 1 minute results in polypropylene. In this case, when liner material made using conventional manufacturing methods is used, it may become fluffy or cut.
Many problems tend to occur, such as the magnetic disk becoming jammed or the smooth rotation of the magnetic disk being obstructed due to the loss of the male or the stoppage of the sugar beet.

(Eye of Inquiry Va) The present invention has been made to solve the drawbacks of the above-mentioned prior art.
An object of the present invention is to provide a method for manufacturing a liner material that does not cause generation of JMJ.

(Structure and operation of the invention) The present invention forms a web containing 5 to 70% by weight of composite fibers consisting of a low melting point component and a high melting point component with a melting point difference of 20°C or more, and the web is reduced to a low temperature without pressing.・” Above the melting point of the black component, but below the melting point of the high-black component? After heat treatment with 11 parts,
This is a method for producing a floppy disk liner material, which is characterized by partially thermocompression bonding with +i+A & above the softening point of a high melting point component.

The heated fibers used in the present invention have an r liquid point difference of at least 20
It consists of a low-black component and a high melting point component, such as polyethylene, hollybrobylene, 1 g of melting point polyester, and 1 d of high melting point polyester.
Curved fibers such as type, i/II type, etc. are suitable.

These composite lines *it are polyesters that do not melt in the bath at temperatures higher than the melting point of the component with the same melting point or α.

It is mixed with fibers such as rayon to form a web. It is necessary that this web contains 5 to 70% by weight of reciprocating fibers; if the amount of composite fibers is less than this, the object of the present invention cannot be achieved; It is not preferred as a liner material because it lacks silkiness and softness and has poor cleaning properties. A particularly preferred amount of composite fibers is 20 to 40% by weight.

When the above-mentioned web is heat-treated at a temperature higher than the melting point of the low-melting point component and lower than the melting point of the high-melting point component without pressing, only the low-melting point component melts and aggregates at the intersection of the w and fibers, while the high melting point component is in the form of fibers. Δ1 thermal temperature must not exceed the melting point of the high melting point component. For example, here) if you use conventional polypropylene fibers, even if you can achieve unity at the fiber points, the fiber morphology will change. Because it crumbles, its strength and wear resistance are significantly reduced. Also, this heat/treatment is 3! l (This must be done under pressure; when pressure is applied, the low-melting point components spread out, forming a web between the fibers, and the web is fixed with #6 fasteners, resulting in stiffness and flexibility. The sex is markedly affected.Here 1
．． ,! Heat treatment under IC suppression refers to heat treatment that does not apply much pressure to the web using di or single-item radiation heat, and a particularly preferred heating method is to use hot air with the upper blade 7J.
), the material is sucked from below so that it passes through the web and exits downward. According to such a dish heating method, it is possible to uniformly heat the entire web to the inside.

After this heat treatment, the web is partially hot-pressed at a temperature higher than the softening point of the high-melting point component. It is formed so as to be distributed at +5+tA of Wataru.The proportion of the four parts of the thermocompression bonding part in the web assembly is 10 to 40%.
is preferred.

In this heat-pressing 4 parts, the low melting point component concentrated at the fiber intersection point and the high melting point component concentrated at the fiber intersection point during the heat treatment contribute to adhesion, and a strong bond can be achieved.

However, it is preferable that the high melting point component does not significantly change its fiber form, so the - temperature of the pressure sensitive
It is better to be at least the widening point, but lower than 1 point. Also,
In order to prevent fibers from sagging, it is better to lower the friction pressure during thermocompression bonding, and when using an embossing calendar etc.
It is desirable that the pressure is in the range of 5 to 30 #7 cm.

The reason why the conditions for the a11 part and pressure for thermocompression bonding can be set low in this way is that the present invention performs thermocompression bonding after heat treatment in the irradiated press mode. For moving pieces that are made of liner material only by crimping, if the uni degree and pressure conditions are lowered, sufficient bonding force will not be maintained.
Tiru. In addition, when forming the liner material with the original pressure of 1 pressure and only t, this is 1-JJ (rA).Since it is thermocompressed under the conditions of 66 pressure, the t-summer fibers containing polyethylene components are +J q6 Due to the low roll resistance, the roll web was curled and could not be used, but in J6 Ming, the polyethylene component was fiber-crossed and coagulated into strips due to heat treatment without pressing. Since the thermocompression bonding is carried out under conditions of lower heat and pressure than conventional methods, the web does not get stuck on the roll.In this way, even with y+t, a synthetic fiber containing components with a low melt viscosity, there is no difference in production due to the manufacturing method of the present invention.
It can be used without any problems.

The liner material produced by the manufacturing method of [6]
While the 1j part remains in a high condition, the fibers are 10-coupled, providing good cushioning, flexibility, and cleanability, as well as no fluffing or shedding of fibers, resulting in wear resistance. On the other hand, in the right part of the thermal pressure, the aggregated low melting point component and the mineralized high melting point component are mixed together, so
A strong unity is obtained. Furthermore, in the present invention, the heat and pressure conditions applied at this time can be set to ir+, which is comparable to conventional conditions, so that the occurrence of tree 1iaVJ due to fiber breakage does not occur.

(Implementation@) Example: Polyethylene component with melting point of 135°C and Mii point of 170
Composite fiber 30M1% consisting of polypropylene component of °C
Mf and rayon fiber 70% Arashi Shigeru and fabric weight 35f/s
Forms a +2 web.

After wiping, the web is subjected to a B1 heat treatment at a temperature of 135° C. in a saxilan band type hot air aeration device.

Thereafter, thermocompression bonding was carried out using an embossing calender at a temperature of 155° C. and a linear pressure of lO#/α to form a liner material in which the ratio of 1Jii product of the thermocompression portion to the web curve area was 28%.

This finisher: I is cushion 1 raw, front, 1 missing, 1 top,
Good cleaning properties, no fuzzing, no fibers coming out, 1 package)
There was no first outbreak. In addition, the tensile strength is 6.0 groan/ζ
[1] It was a J bug. Furthermore, when the rotational torque f i,ijl was determined as a means of facing the liner material, small values were obtained under each load as shown in the table, and a daily rotation was observed during use. I forgot about that.

For comparison, 30% by weight of polypropylene fibers and 70% by weight of trayon fibers were mixed and a web having a basis weight of 351/m2 was cut into J6. Next, this web was warped at 75°C, 1. A
The liner material with 28% LIlla in 1 lll area of the web was passed through an enphos calender at a pressure of 50 mm/α, and the four products of tension, pressure, and heat pressure were 28% of the total area of the web.
child.

J) The liner ladle is prone to fluffing and whitening like '41J and F due to severe damage to the fibers, and the tensile strength is 1.
．． 8 tq It was weak at 15cm wide. Also, the rotational torque is real...i! Compared to Example A, the rotation performance was also inferior.

Table Rotating torque Unit; ×16-2 (Nm
In addition, the torque of one river between the disc and the liner material is )t
Ell) ON-14T T type Torque friction resistance measurement results (manufactured by Seifuku Kagaku Co., Ltd.) were used to obtain a constant value.

(Effects of the Invention) As described above, according to the present invention, it is possible to bind the fibers in the non-thermo-bonded part without impairing the elasticity or flexibility, so it is resistant to fluffing and fibers falling out. It would be possible to obtain a liner material with excellent abrasion resistance.

In addition, in the present invention, thermocompression bonding is carried out after heat treatment without pressure, so it is possible to prevent one degree of heat compression bonding and pressure damage compared to conventional methods, and fiber breakage is also less likely to occur. stomach.

Furthermore, 1. 7., poor place, J! Makoto,
, 11, the low 1 point component that aggregates at i, λ is well utilized by heat and pressure, and the fall pressure d of the 7, 1 point component can also be used for = f' + J, so it becomes strong 1. A crushed liner material is obtained.

In this way, according to this book, fluff, fibers, and resin do not easily attach the magnetic disk or prevent the smooth rotation of the magnetic disk, and moreover, when using a long) Vl, It is possible to efficiently manufacture liner materials with almost no trouble even when the product is used.

Claims (1)

[Claims] A web containing 5 to 70% by weight of composite fibers consisting of a low melting point component and a high melting point component with a melting point difference of 20°C or more is formed, and the web is heated to a temperature higher than the melting point of the low melting point component and a melting point of the high melting point component without pressing. 1. A method for producing a floppy disk liner material, which comprises heat treatment at a temperature below the softening point of the high melting point component, followed by partial thermocompression bonding at a temperature above the softening point of the high melting point component.