JPH0798084B2 - Method for manufacturing tee molded body for golf - Google Patents

Description

The present invention relates to a method for manufacturing a golf tee molded body.

[Conventional technology]

Conventionally, many golf tees made of plastic or wood are commercially available. But these are
This has caused damage to the blades of lawnmowers and makes maintenance of the fairway difficult, which has recently become a major problem on golf courses.

The use of plastic or wood as the molding material is excellent in that it is suitable for hot injection molding or cutting, but golf tees made from such molding materials are not suitable for natural water such as rainwater. Since the shape does not collapse due to the phenomenon, it cannot solve the above-mentioned problems.

On the other hand, as a method for molding a golf tee molded body, in addition to this, an extrusion method, a dry pressing method, a rubber pressing method, a semi-wet pressing method, a combined method of an extrusion method and a semi-wet pressing method, a casting method, etc. are considered. Have been implemented. In these methods, a method of performing post-processing such as cutting after forming into a shape of a golf tee and further performing surface coating for the purpose of improving moisture absorption resistance and strength is also being studied.

However, since the golf tee has a complicated shape, the yield of the molded body is poor in the above-mentioned general molding method, and post-processing is difficult to perform efficiently.

Next, problems in each molding method will be listed.

The extrusion method is a semi-wet molding method using a water-soluble polymer, a plasticizer, a lubricant, etc.The above material is extruded into a cylinder from a predetermined die, cut into a certain size, and then formed into a predetermined shape. This is a method of cutting using a ceramic grindstone or the like. However, in this method, since the raw material is cut, the loss of the raw material is large, and the molded product is easily cracked or deformed during processing.

In the dry press method, generally, a mechanical press or a hydraulic press is used to mix a water-soluble polymer, a plasticizer, a lubricant and a ceramic raw material powder with a slurry, and a granulated powder is granulated using a spray dryer. Put into a predetermined mold, about 1
Press molding at a molding pressure of ton / cm ² or more. However, with this method, only a simple shape can be manufactured, post-processing is required, and moreover, cracking easily occurs in the molded product, and processing is very difficult.

The rubber press method is a method of injecting the spray-dried granular powder used in the dry molding press method into a rubber mold and press-pressing to obtain a product having a complicated shape.
In this molding method, the shape of the molded product is insufficient, and it is necessary to cut the molded body using a grindstone or the like and finish the processing, which results in a loss of raw materials and an increase in cost.

The semi-wet press molding method uses ceramic raw material powder
Water, water-soluble polymer, plasticizer, etc. are added, and after passing through a sieve (screen mesh) in a semi-wet state, the particles are sized by a method such as rolling, and then put into a predetermined mold and molded. is there. This molding method can mold a shape that is impossible with the dry pressing method, but it requires management of the water content of the raw material, it is difficult to remove from the mold, the density of the molded body is low, and the strength is high. Does not come out.

The combination of extrusion method and semi-wet press molding method is to dry a molded product extruded in a cylindrical shape until a predetermined water content is reached, and then cut the molded product in a predetermined dimension in the length direction, and then press-mold it. This is a method in which a column is placed in a mold and press-molded to take out a molded product from the mold. Therefore, in this method, it is necessary to control the water content from the time of extrusion molding so that the raw material has a water content suitable for the semi-wet press molding method, and this water content management is difficult, and further,
It is also difficult to control the water content that causes adhesion to the mold when semi-wet press-molding the extruded body, the process requires time, and production efficiency is significantly impaired.

The cast molding method is a molding method used to obtain a ceramic molded product with a complicated shape. It is made by mixing ceramic powder with water and a dispersant, and pressure is injected into the gypsum mold to make a plaster mold. In this method, the molded article is obtained by absorbing the water content and then removing from the mold, resulting in poor dimensional accuracy of the molded article, long molding time, and extremely poor manufacturing efficiency.

As described above, none of the above molding methods is suitable as a method for producing a golf tee molded article, and a method capable of efficiently producing a golf tee molded article without performing post-processing. Development is desired.

In addition, recently, some golf tees whose shapes are collapsed by natural phenomena such as rainwater have been proposed. For example, JP-A-1-198570 discloses a molding material containing a weathering clay-like substance. There is disclosed a golf tee which is used and molded by putting this molding material in a plaster mold.

However, even in the case of the manufacturing method using the molding material described in JP-A-1-198570, the golf tee molding has good dimensional accuracy because it is a casting molding method using a plaster mold or the like. It is difficult to obtain a body, a long molding time is required, and the manufacturing efficiency is not good. Moreover, since such a molding material does not have thixotropy, it cannot be molded by filling it in a mold using a general injection molding machine.

[Problems to be solved]

The present invention improves the above-mentioned drawbacks of conventional golf tee moldings, and uses a molding material whose shape collapses due to a natural phenomenon such as rainwater, so that golf tee molding can be efficiently performed without post-processing. It is an object to provide a method for manufacturing a body.

[Means for solving the problem]

In the method for producing a golf tee molded article of the present invention, the shape of the golf tee is disintegrated due to a natural phenomenon such as rainwater, and therefore, a) a natural raw material containing one or more silicates as a main raw material, b) one or more water-soluble binders having thixotropy, and c) an appropriate amount of water as an essential component, and 2 to 20 parts by weight of the water-soluble binder per 100 parts by weight of the natural raw material. It is characterized in that it is molded at room temperature using an injection molding machine, using the molding material contained in 1.

In the present invention, as a natural raw material containing a silicate, it is possible to use plastic raw materials such as kibushi clay, frog eye clay, kaolin, and porcelain, and these raw materials have plasticity by adding water, and are molded. In order to improve the properties and the strength of the molded body, it becomes possible to carry out molding using a small amount of binder within the practical range. Further, the above-mentioned raw materials are also useful for preventing mold release defects and shape retention defects that occur when there are many binders.

On the other hand, as the water-soluble binder used as a molding aid, when dissolved in water, those having a large thixotropy have good moldability, and among them, methyl cellulose, methyl hydroxyethyl cellulose, methyl hydroxypropyl cellulose, a salt of carboxymethyl cellulose, hydroxyethyl cellulose. Cellulosics such as are very suitable. In addition, polyethylene oxide, polyacrylic amide, alginic acid salt, etc. can be used for the same reason. When these are used as the main binder components, water-soluble binders such as starches, gum arabic, lignin sulfonic acid salt, etc. can also be used together. It is possible.

In the present invention, a plasticizer and a lubricant may be added as required, and the plasticizer may be an extrusion molding of ordinary ceramics such as ethylene glycol, diethylene glycol, glycerin, pentamethylene glycol, and phthalate ester series. What is used in can be used. Further, as the lubricant, fatty acid, fatty acid metal salt, fatty acid emulsion, wax emulsion, higher alcohol, etc. can be used.

Since the above-mentioned natural raw material containing the silicate and the water-soluble binder have solubility in water, the shape of the golf tee molded article can be destroyed by a natural phenomenon such as rainwater.

At this time, regarding the addition range of the water-soluble binder, it is preferable that the water-soluble binder is contained in a ratio of 2 to 20 parts by weight with respect to 100 parts by weight of the natural raw material. If the amount of the water-soluble binder added is less than 2 parts by weight, the plasticity is insufficient, molding cannot be performed, and the strength is weakened and the handling becomes difficult. On the other hand, when the amount is more than 20 parts by weight, the strength and plasticity are good, but the releasability from the mold becomes poor and it becomes difficult to take it out from the mold, resulting in very poor workability.
In addition, the shape retention property when taken out from the mold also deteriorates.

Further, when a natural raw material containing silicate having plasticity is used, the amount of the water-soluble binder added can be reduced.

In the production method of the present invention, since the golf tee molded article is molded using the molding material containing the above components and the cold injection molding method, which is a method of injection molding at room temperature, it can be manufactured efficiently. It can be performed. In the manufacturing method of the present invention by such a cold injection molding, an injection molding machine used as a plastic molding machine can be used, so that it is excellent in mass productivity, and even a molded product having a complicated shape has a high filling property. Excellent and uniform product can be obtained. Therefore, by using this molding method, desired molded products can be efficiently obtained for various shapes, and no post-processing is required.

This cold injection molding method is performed, for example, by the following method. First, the above-mentioned natural raw material, water-soluble binder, and water are mixed with a kneader, pelletized by an extrusion granulator, and then charged into a pressure cylinder of an injection molding machine. Then, an injection pressure of 200kg / cm ² ~1000kg / cm ² conditions at room temperature, the molding material filled into the mold clamping was a mold, after a desired shape, taking out the product by opening the mold.

As the injection molding machine used for the cold injection molding of the present invention, either a screw type or a plunger type can be used, but the plunger type is easier to handle in terms of wide molding tolerance. .

In the present invention, the golf tee molded product after cold injection molding may be surface-coated with a urethane resin as a coating agent for the purpose of improving moisture absorption resistance and strength.

〔Example〕

Example 1 Kibushi Clay (Kaolinite Branched Kibushiki, the main component) 100 parts by weight Sodium salt of carboxymethyl cellulose (1% viscosity about 300 cp, 25 ° C, degree of etherification 0.65) 10 parts by weight Water 30 parts by weight Glycerin (plasticizer ) 1 part by weight The above composition is mixed with a kneader (Kneader volume 3 manufactured by Fuji Paudal Co., Ltd.) for 30 minutes to prepare a mixture,
Using a plunger type injection molding machine (3/4 oz manufactured by Yamashiro Seiki Seisakusho Co., Ltd.) at an injection pressure of 550 kg / cm ² to make a golf tee shape, and further molding this molded body. After drying at 100 ° C. to 110 ° C. for 1 hour, the surface was coated with a commercially available urethane resin to obtain a golf tee molded body.

In Examples 2 to 6 below, golf tee molded bodies were produced in the same manner as in Example 1 except that the mixed composition was changed. In Comparative Examples 7 and 8, golf tee molded bodies were produced by filling the plaster molds with the respective molding materials.

Example 2 Frog eye clay (main component kaolinite Tokiguchi Frog eye) 100 parts by weight methyl cellulose (molecular weight about 40,000 methoxyl substitution degree 28
%) 5 parts by weight Water 21 parts by weight Example 3 Porcelain stone (main components quartz, sericite, kaolinite Izushi Kakitani pottery stone) 100 parts by weight Hydroxyethyl cellulose (2% viscosity 1200 cp, 25 ° C.)
10 parts by weight Water 18 parts by weight Diethylene glycol (plasticizer) 2 parts by weight Sodium oleate (lubricant) 1 part by weight Example 4 Kibushi (major component kaolinite edamabushi) 100 parts by weight Polyacrylic amide (molecular weight 5 million) ) 15 parts by weight Water 20 parts by weight Example 5 Frog eye clay (main component kaolinite Tokiguchi Frog eye) 100 parts by weight Polyvinyl alcohol (saponification degree 88%, degree of polymerization 2000) 20
Parts by weight α-starch (Morgumu # 100 manufactured by Matsutani Chemical Co., Ltd.) 5 parts by weight Water 20 parts by weight Comparative Example 1: When using a water-soluble binder having no thixotropic property Frog eye clay (main component kaolinite Tokiguchi Frog eyes) 100 parts by weight Sodium polyacrylate (Molecular weight 300,000) 15 parts by weight Water 18 parts by weight Comparative Example 2: When the amount of water-soluble binder is large Feldspar (main component is potassium feldspar, Fukushima feldspar, a natural raw material without plasticity) 100 parts by weight Methylcellulose ( Molecular weight 40,000 Methoxyl substitution degree 28
%) 25 parts by weight Water 60 parts by weight Comparative Example 3: When the amount of water-soluble binder is large 100 parts by weight silica (main component is quartz) Hydroxyethyl cellulose (2% viscosity 1200 cp, 25
℃) 30 parts by weight Water 70 parts by weight Comparative Example 4: When the amount of water-soluble binder is small Fukurome Clay (main component Kaolinite Tokiguchi Fukume) 100 parts by weight Methylcellulose (molecular weight 90,000 methoxyl substitution degree 28%)
1 part by weight Water 19 parts by weight Comparative Example 5: In the case of not containing any water-soluble binder Frog eye clay (main component Kaolinite Tokiguchi Frog eyes) 100 parts by weight Water 20 parts by weight Comparative Example 6: Containing pulp without thixotropy Granite 100 parts by weight Pulp 8 parts by weight Chemical starch 2 parts by weight Water 20 parts by weight Comparative Example 7: By Casting Molding Method The molding material described in Comparative Example 5 above was used, and this molding material was placed inside a plaster mold. It was filled to prepare a golf tee molded body.

Comparative Example 8: By Casting Molding Method The molding material described in Comparative Example 6 was used, and the molding material was filled into a plaster mold to prepare a golf tee molded body.

The golf tee molded products obtained in Examples 1 to 8 described above were evaluated for moldability (fillability, releasability, shape retention), strength and appearance of the molded product.
It is shown in Table 1 below.

Moldings with a strength of 100 kgf / cm ² or more will crack during use,
It was not practically usable.

* Fillability, releasability, shape retention and appearance of the molded product are determined by visual judgment.

The golf tee molded bodies produced in Examples 1 to 5 above are
There was no problem in actual use, and the Tee molded article that was broken during use was swollen by rainwater and almost completely collapsed in shape.

〔The invention's effect〕

In the golf tee molded body manufactured by using the manufacturing method of the present invention, since the molding material uses a natural raw material and a water-soluble binder whose shape collapses due to a natural phenomenon such as rainwater, there has been a problem in the conventional golf course. Damage to the blade of the lawn mower and the maintenance of the fairway can be reduced.

Further, by using the cold injection molding method of the present invention,
Molded products can be easily manufactured for various shapes without post-processing, the product yield is significantly improved, and mass production becomes possible.

Claims (1)

[Claims] 1. A) a) a main raw material, a natural raw material containing one or more kinds of silicates, b) one or more kinds of water-soluble binders having thixotropy, and c) an appropriate amount of water. A molding material containing 2 to 20 parts by weight of the above water-soluble binder as an essential component and 100 parts by weight of the above-mentioned natural raw material is used, and is molded at room temperature using an injection molding machine. And a method for producing a golf tee molded body.