JPS61231704A - Permanent magnet - Google Patents

Abstract

PURPOSE:To obtain a permanent magnet which can be adhered by merely giving heat by a method wherein a hot melt bonding agent is mixed in a magnetic material, and they are molded and magnetized. CONSTITUTION:A permanent magnet 8 is a plastic magnet wherein a hot melt bonding agent is mixed. The hot melt bonding agent is fused by applying heat using a hot press and the like, and the permanent magnet 8 is adhered and fixed to the surface of a cushion material 2. Said hot melt bonding agent is composed of thermoplastic resin, an adhesion-giving agent, wax and the like, and a multicomponent bonding agent is obtained as occasion demands by adding an anti-oxidation agent and a filler.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a permanent magnet used in, for example, health appliances.

<Background of the Invention> For example, a health appliance has been proposed that uses a plurality of permanent magnets on the surface of a mat to apply magnetic lines of force to the human body, thereby promoting blood circulation and relieving stiffness and fatigue. However, in the case of this type of device, adhesive is applied to the back side of the permanent magnet and this is adhered to the mat surface.
It takes time and effort to manufacture the instruments, reducing manufacturing efficiency.

In addition, not only in this type of device, but because permanent magnets require the application of adhesive to fix them, their shapes and uses are limited, and there is a limit to expanding the range of products that use permanent magnets.

<Purpose of the invention> The present invention proposes a permanent magnet that does not require any adhesive application for fixing to a base material such as a mat, thereby improving the manufacturing efficiency of devices using permanent magnets, and improving its application. The purpose is to contribute to the expansion of products.

<Configuration and Effects of the Invention> In order to achieve the above object, in the present invention, a true melt adhesive is mixed into a magnetic material, and this is molded and magnetized to form a permanent magnet.

According to this invention, since it is possible to bond the permanent magnets by simply applying heat, it is possible to manufacture devices using permanent magnets more efficiently than with the conventional method of applying adhesive. It has many excellent effects, such as eliminating restrictions on the shape and use of permanent magnets and expanding the range of products that use permanent magnets.

<Description of Examples> Fig. 1 shows a health pillow using the permanent magnet of the present invention, in which the pile body 1 has a plurality of tile-like shapes between the upper and lower cushioning materials 2.3 to obtain a head cold effect. Place the ceramic plate 4,
The entire outside of the cushion material 2.3 is covered with a cover cloth 5.

The upper and lower cushioning materials 2.3 are provided with a corrugated surface 7 consisting of a large number of protrusions 6 on their outer surfaces, and the corrugated surface 7 of the upper cushioning material 2 is provided with a portion where the neck and shoulders of the human body come into contact. A plurality of hemispherical permanent magnets 8 are fixedly fitted into the recesses.

Each of the permanent magnets 8 in the illustrated example is a plastic magnet mixed with a hot-melt adhesive, and when heat is applied to this using a heat press or the like to melt the real-melt adhesive, the permanent magnet 8
is adhesively fixed to the surface of the cushion material 2 (see Fig. 2).

The plastic magnet is made of a plastic magnetic material using ferrite powder such as barium ferrite or strontium ferrite (for example, product name "Combo Deink",
(manufactured by Dainippon Ink and Chemicals Co., Ltd.) is molded by a method such as injection molding, or is formed by subjecting it to magnetization treatment at the same time as the molding. The adhesive is kneaded with the magnetic material and used as the raw material.

This true melt adhesive is a multi-component adhesive containing a thermoplastic resin, a tackifier, a wax, etc. as constituent components, and further contains an antioxidant and a filler as necessary. As thermoplastic resins, ethylene-vinyl acetate copolymers, polyamides, etc. are used, as tackifiers, rosin, rosin derivatives, pinene resins, etc. are used, and as waxes, paraffin wax, microcrystalline wax, etc. are used. It will be done.

The mixing ratio of the above hot melt adhesive and plastic magnetic material is 7) Weight % when the melt adhesive is 1.
The plastic magnetic material is set in the range of 6 to 0.4. When set in this way, the mechanical strength and magnetic properties of the molded product, as well as the adhesive strength during heating, will be appropriate.

FIG. 3 shows another embodiment of the invention. In this embodiment, a sheet-like permanent magnet 10 according to the present invention is layered on a base material 9 such as urethane foam, and a covering material 11 such as cloth is further layered on top of the sheet-like permanent magnet 10, for example, to form a sheet. In addition to bedding such as skin futons, it is also used as fabric for clothing such as underwear.

However, in order to fix the permanent magnet 8 or 10 according to the present invention to a base material, it is necessary to fix the permanent magnet 8 or 10 on the fixing surface (the first
The permanent magnet 8 or 10 is adhesively fixed to the base material by applying heat using a hot press or the like to the back surface in the embodiment and both surfaces in the second embodiment to melt the hot melt adhesive.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of a health pillow using a permanent magnet according to the present invention, FIG. 2 is an enlarged sectional view showing the state of adhesion of the permanent magnet, and FIG. It is a partial sectional view showing an example of. 8.9... Permanent magnet patent Permanent magnet Japan Health Promotion Research Association Inc. Iniji + 3 v and 1 4 (Otsu's 9 mira 1 luster! Bukori left Tsu 1τ ÷ 1 Shu → Zan i0

Claims (1)

[Claims] 1. Molding a magnetic material mixed with a hot melt adhesive,
A permanent magnet formed by magnetization. 2. The permanent magnet according to claim 1, wherein the hot melt adhesive is a multi-component adhesive containing a thermoplastic resin as a main component. 3. The permanent magnet according to claim 1, wherein the magnetic material is a plastic magnetic material. 4. The permanent magnet according to claim 1, wherein the molded body is solid. 5. Claim 1, wherein the molded body is in the form of a sheet.
Permanent magnets listed in section.