JPS5943443B2 - Method of manufacturing mosquito coils - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for producing mosquito coils.

Conventionally, mosquito coils have been manufactured as follows.

That is, mosquito coil base materials (wood flour, pyrethrum extract lees, etc.) and aleurone powder (
A compound obtained by adding insecticidal ingredients, pigments, antifungal agents, etc. in arbitrary proportions to tab glue, synthetic glue, etc. is mixed with water, and the mixed product is molded into a plate shape using an extruder. It is manufactured by directly punching it into a spiral shape using a mold and finally drying it in the sun.

However, in the above-mentioned known method, the following various disadvantages are involved, particularly when stamping the extrusion-molded mixture into a plate shape.

1. Since the wire compound is directly punched and molded using a mold, the mold wears out significantly, so-called blade spillage occurs, and regular maintenance and repair of the mold (usually once a day) is required, which is time-consuming.

2. The mold is clogged with sludge of the kneaded material, making punching difficult, and the sludge must be removed frequently (usually once a day).

3. When the mold is pulled out, a part of the punched molded product adheres to the mold, making it difficult to obtain the desired spiral-shaped product and resulting in a high rate of defective products.

Furthermore, in order to prevent the above-mentioned disadvantages, it is necessary to spray mold release oil or the like onto the mold from time to time.

4 The cut surface obtained by punching and molding is defective.

5. The noise during molding is so loud that it makes the working environment worse.

The present invention has been studied in various ways with the aim of eliminating the various disadvantages mentioned above.

In the process, we came up with a completely new idea of interposing some sort of sheet between the mixture and the mold to indirectly punch out the mixture.Based on this idea, we tested various sheets and found that When using an elastic sheet such as natural rubber, all of the above-mentioned problems are eliminated without any cutting of the sheet, and the surface is smooth and the punching surface (cut surface) is smooth, making it of good quality. The inventors have discovered that mosquito coils can be produced extremely easily and efficiently, and have thus completed the present invention.

That is, in the present invention, a mosquito coil formulation is kneaded with water, molded into a plate shape using an extruder, and then punched into a bucket shape using a mold to produce a mosquito coil. The present invention relates to a method for producing a mosquito coil, which comprises placing an elastic sheet on a molded mixture, and indirectly punching and molding the mixture through the elastic sheet.

An elastic sheet of sufficient size to cover the kneaded product is placed on the kneaded product extruded into a plate shape according to the method of the present invention, and the kneaded product is punched out through the elastic sheet. In some cases, even without spraying any mold release oil, continuous punching and molding can be carried out in the same way as when the sheet is not used, without damaging the sheet, of course reducing noise and preventing the generation of slag. There is an advantage that mosquito coils of good quality with smooth surfaces and cut surfaces can be easily manufactured without substantially producing defective products.

In the present invention, the material of the elastic sheet is not particularly limited as long as it has elasticity, and various synthetic rubbers and synthetic resins including natural rubber can be used. It is preferable to use a sheet made of a material having a ratio of 200% or more.

Specifically, in addition to natural rubber, examples include styrene-butadiene rubber, nitrile-butadiene rubber, chloroprene rubber, imprene rubber, chlorosulfonated rubber, butyl rubber, polysulfide rubber, silicone rubber, acrylic rubber, fluorine rubber, urethane rubber, Examples include butadiene rubber, ethylene propylene rubber, ethylene propylene terpolymer, ethylene vinyl acetate rubber, and chlorinated polyethylene.

Advantageously, the elastic sheet is generally in the form of a sheet having a thickness of about 0.25 mm or less.

In the method of the present invention, as long as the above elastic sheet is used,
Preparation of a mosquito coil formulation as a raw material, a method for kneading it with water,
Conventional methods such as extrusion molding and punching molding may be used.

In other words, the composition of the raw material mixture, the amount of water during hydro-mixing, the mold used for punching and the pressure of the mold, etc., may be in accordance with known conditions, and as a result, the elastic sheet can be cut as desired without being cut at all. It shows the effect of

Examples will be given below to explain the present invention in more detail.

Example 1 A mosquito coil formulation having the following composition is prepared.

88 parts by weight of water was added to 100 parts by weight of the above blend, and after kneading with water, it was molded into a plate shape with a thickness of about 4rIL11L using an extruder.

Next, a natural rubber sheet of thickness Q and 25 mm (tensile strength 320 kg/cri, elongation rate 800
%) is placed on the sheet, and the sheet is punched and molded using a mold.

As this punching and forming machine, for example, one shown in FIG. 1 is used.

The conditions during molding by the molding machine are as shown in FIGS. 2 and 3.

In each figure, 1 is a mold tooth, 2 is a mosquito coil extrusion piece, so-called guess,
3 indicates an elastic sheet and 4 indicates an extrusion-molded mosquito coil compound.

During stamping according to the method of the present invention, the mold teeth 1 cut the mixture 4 into a predetermined spiral shape through the elastic sheet 3, as shown in FIG.

At this time, the elastic sheet 3 extends along the cut surface of the mixture 4 as the teeth 1 descend, and tightly covers the mixture 4 while pressing it from its upper surface.

At this time, the elastic sheet 3 is stretched due to its elastic properties, but of course is not cut or damaged in any way.

In this way, the cut surface and the upper surface of the elastic sheet 3 are smooth and evenly aligned, and furthermore, the generation of mixture slag and the adhesion of the mixture to the teeth are completely prevented.

Furthermore, when the die teeth of the sheet 3 rise after punching,
It is restored to its original horizontal sheet-like form by its own elastic force.

Thus, according to the method of the present invention, there is no need for maintenance or cleaning of molds, or the use of mold release oil, etc., and noise during molding is significantly suppressed, and high-quality mosquito coil products can be produced continuously and efficiently. You can earn it.

The resulting products exhibit a particularly smooth surface appearance and the incidence of rejects is virtually negligible.

Of course, the flammability, insecticidal efficacy, etc. of the product are not affected at all by the use of the elastic sheet.

In addition, if an elastic sheet is not used in the above, similar punching operations will require mold maintenance once a month, mold cleaning once a day, and the use of about iol of mold release oil per mouth. Even with this method, the number of defective products was about 6 times higher than when using an elastic sheet, and the noise at a distance of 2 m from the punching machine was about 30 to 40% higher than when using an elastic sheet.

[Brief explanation of the drawing]

The drawings show a preferable example of implementing the method of the present invention, and FIG. 1 is a partial cross-sectional perspective view of a punching and forming machine, and FIG. 2 is a die and an elastic sheet placed immediately before punching and forming. A cross-sectional view of the mixture and FIG. 3 are partially enlarged cross-sectional views of the tooth portion of the mold during stamping. 3...Elastic sheet, 4...Kneaded material extruded into a plate shape.

Claims (1)

[Claims] 1 After kneading the mosquito coil formulation with water, it was molded into a plate shape using an extruder, and then punched into a bucket shape using a mold to produce mosquito coils. A mosquito coil characterized in that an elastic sheet having a size sufficient to cover the kneaded product is placed on the kneaded product, and the kneaded product is punched and molded through the elastic sheet. Production method.