JPH0585555A - Production of cork plug by synthetic resin-binded material - Google Patents

Abstract

PURPOSE:To form a cork plug provided with synthetic resin skin at the outer periphery and obtain a stable quality, by stuffing the raw kneaded material composed of in a thermo-plastic synthetic resin vessel and charging it in a metallic mold to heat with pressure. CONSTITUTION:A cork plug is made of thermo-plastic synthetic resin with cork perticles as a binder. In this case, at first, kneaded raw mixture 4 of a specified volume of thermo-plastic synthetic resin 2 and cork perticles 3 are stuffed in a thermo-plastic sythetic resin vessel 1 on producing it. Next, the vessel 1 is contained in a metallic mold to heat with pressure to form a cork plug 5. And a synthetic resin skin 6 is formed at the periphery of the cork plug 5 by heat-melting the vessel 1. In this time, raw material 4 can be formed to be a disc 7 for instance to stuff a plurality thereof in the vessel 1. And a core hole 51 is formed to mount a cover at the upper end of the cork plug 5. In this way, cork plugs with stable qualities can be easily and inexpensively produced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a cork stopper, and more particularly to a method for producing a cork stopper using a synthetic resin as a binder, which can substitute for a natural cork stopper or a pressed cork stopper used as a container stopper.

[0002]

2. Description of the Related Art Natural corks and pressed corks as corks of this type have been used for a long time as bottles for drinks such as wine, glass containers and pottery. Although the details of the natural cork stopper are omitted, cork oak bark is processed by cutting, cutting, polishing, etc., and bleached to be used as a product as shown in FIG. 6, for example.

Although details of the squeezed cork stopper are also omitted, for example, crushed cork particles are carefully selected, mixed with an adhesive, and then heated and pressed to form a squeezed cork plate or a squeezed cork rod. It is used as the product shown in FIG. This pressed cork stopper has cork particles exposed on the surface, and the surface in contact with the bottle mouth is covered with cork cells like the natural cork stopper.

To bond cork particles, generally, the solid content of the resin contained in the natural resin-based adhesive or the synthetic resin-based adhesive is mixed in the range of 10 to 30 parts by weight with respect to 100 parts by weight of the cork particles. And molded. Since natural corks and pressed corks are expensive, synthetic resin moldings such as polyethylene and ethylene / vinyl acetate resin are used as substitutes for corks. This substitute can be mass-produced and the quality is more stable than that of cork stoppers, but even if the coloring and shape are devised, the material feeling similar to natural cork cannot be obtained.

[0005]

Among the above-mentioned conventional techniques, in the natural cork stopper 21, a part of the annual ring layer generated during the cork growth stage is formed into a groove 24 as shown in FIG. The groove opening 23 may be formed on the liquid contact surface 22 side. Thus, when the groove 24 appears in the liquid contact surface 22 in the form of the groove opening 23, dust existing in the groove 24 falls into the beverage in the bottle and floats on the liquid surface or the liquid of the beverage. When the consumer drinks, these dusts are transferred to a cup or the like and cause a complaint. Therefore, in such a case, although not shown, the slit 23 opening is cut into a V shape by a cutter, or an aluminum foil is spotted to cover the adhesive surface to prevent dust from falling. In this way, natural cork has irregular grooves 24,
This causes the quality to become unstable, such as the variation in the plug strength and the liquid leakage, and the cost is high to obtain a good quality cork stopper.

[0006] The pressed cork stopper is low in cost because crushed natural cork particles are easily available, and the quality is stable because there is no groove like the natural cork stopper. The natural cork stopper 21 generally cannot have a diameter equal to or larger than the thickness of the bark, but the compressed cork can be a large diameter cork stopper. However, although the squeezed cork stopper has cork particles bonded with an adhesive as shown in Fig. 7, when expanded, there are gaps between the particles, and the scent and alcohol content of alcoholic beverages are scattered through the gaps. However, it is likely to cause weight loss.

Further, when the squeezed cork stopper 31 shown in a partially enlarged view of FIGS. 7 and 8 is soaked in alcohol for a long period of time, the cork surface becomes uneven 32, and the cork surface discolors 33 to a natural cork stopper. It does not cause a mild discoloration and reduces the commercial value. Unlike natural cork stoppers and squeezed cork stoppers, the substitutes made of synthetic resin molded products are made into hollows, foamed products, or by applying repulsive force, unlike natural cork stoppers or pressed cork stoppers. There was a problem that it was not possible to obtain a material feeling like a cork stopper.

In order to eliminate the above-mentioned problems, the present invention fills the gap between cork particles with a synthetic resin,
An object of the present invention is to provide a method for producing a cork stopper that eliminates the quality instability of a natural cork stopper by forming a thick synthetic resin layer on the surface.

[0009]

DISCLOSURE OF THE INVENTION The above-mentioned object of the present invention is to pack a raw material made by kneading a predetermined amount of thermoplastic synthetic resin and cork particles in a container made of thermoplastic synthetic resin, and mold the raw material. It can be achieved by using a method of forming a stopper required as a cork stopper by heating and press-molding it in a container and forming a synthetic resin outer cover on the outer periphery of the stopper by melting the container.

In carrying out the above-mentioned method, a raw material is required as a cork stopper after kneading a predetermined amount of thermoplastic synthetic resin and cork particles with a pressure heating kneader and dispensing this into a sheet form. The raw material is formed of a thermoplastic synthetic resin having a melting point of 80 ° C. to 130 ° C. and cork particles having a particle diameter of about 1 mm to 5 mm, and 100 parts by weight of cork particles are formed. On the other hand, the thermoplastic synthetic resin is kneaded in the range of 100 to 400 parts by weight, and the container (cup or bag) made of the thermoplastic synthetic resin is the same as the thermoplastic synthetic resin kneaded with the cork particles. This method can be more specifically achieved by using a synthetic resin that does not cause a problem when it is used as a material or a stopper and has a thickness of about 0.2 mm to 1.0 mm.

[0011]

By adopting the above-mentioned method, the quality stability of natural corks can be improved, mass production is possible, the cost is not further increased, the permeability of compressed corks is improved, and discoloration by alcohol It is a new type of plug that has a sealing performance that makes use of the material feeling of cork and that does not have a strange feeling unlike synthetic resin products.

[0012]

EXAMPLES Examples will be described with reference to the drawings. First, the basic method of the present invention is as shown in FIGS.
A container (cup) 1 made of a thermoplastic synthetic resin is filled with a predetermined amount of a raw material 4 made by kneading the thermoplastic synthetic resin 2 and cork particles 3, and the raw material 4 is put into a mold 8 and heated and pressure-molded. As a result, a stopper body 5 required as a cork stopper is formed, and the outer periphery of the stopper body 5 is melted by the container to form a synthetic resin outer cover.
6 is formed.

The above method will be described more specifically with reference to FIG. First, the raw material 4 has a melting point of 80 ° C
Thermoplastic synthetic resin (powder) 2 at 130 ° C., specifically low-density polyethylene resin (referred to as LDPE) 100-40
0 parts by weight and cork particles with a particle size of 1 to 5 mm 3, 1
00 parts by weight are weighed and put into a kneader (not shown) that has been preheated to 120 to 130 ° C. and kneaded for about 4 minutes.

When a thermoplastic synthetic resin having a melting point of 80 ° C. to 130 ° C. is used, a product having a melting point of 80 ° C. or less has a large change with temperature when it is made into a product and cannot be used as a product. Further, if the melting point is 130 ° C. or higher, it is difficult to knead with the cork particles, and even if the kneading is performed, the cork particles will burn due to the heating during molding, and cannot be used.

Further, when the mixing ratio of the cork particles 3 and the thermoplastic synthetic resin (powder) 2 is 100 parts by weight or less of the synthetic resin with respect to 100 parts by weight of the cork particles, the amount of the synthetic resin in the cork particle gap is small. The permeation of the contents and the strength of the cork when used as a cork stopper will decrease, and when it is 400 parts by weight or more, the amount of cork particles will be small, and when it is made into a product, the cork particles will be offset and the appearance will be resinous, and the material You will lose your senses. Table 1 shows an actual formulation example.

[0016]

[Table 1] Formulation A is a synthetic resin (low density polyethylene, ethylene.
100 parts by weight of vinyl acetate, cork particles (5 mm particles,
(2 mm particles, 1 mm particles) 100 parts by weight, compounding example B is 200 parts by weight of synthetic resin, and compounding example C is 100 parts by weight of cork particles with respect to 400 parts by weight of synthetic resin. This range is preferred as shown below.

The raw material (compound) taken out from the kneader is heated to about 120 ° C. by an open roll (not shown) to quickly obtain a thickness of 7.2 mm to 7.3.
Divide into about mm and process into a sheet. After that, a raw disc 7 having a diameter required for a stopper, in this example, 20 mm in diameter, was made from a sheet-shaped dispensing material, and this was made into a low thickness of about 0.2 mm to 1.0 mm as shown in FIG. Fill a container (cup) 1 made of high-density polyethylene with the number of plugs that gives the required height as a stopper. This container 1 is prepared beforehand by the blow molding method and prepared.

In the embodiment shown in FIG. 1, three green disks 7 are prepared.
Then, as shown in FIG. 2, it is packed in a mold 8 of a press capable of heating and cooling. This mold 8 is composed of an upper mold 81 and a lower mold 82.The raw-made disc 7 packed in a container is inserted into the cavity 83 of the lower mold 82, and the upper mold 81 descends to heat and heat the cavity 83. Is pressed.

After heating and pressurizing at 160 ° C. for about 8 minutes, the mold 8 is cooled to 40 ° C. or lower and taken out from the cavity 83. By this heating and pressure molding, the synthetic resin container 1 is melted to form the synthetic resin skin 6. By this heating and pressure molding, as shown in FIG. 3, a cork stopper 5 made of a synthetic resin binder is completed. By this molding, a core hole 51 for mounting the shade 9 made of glass, synthetic resin, wood or the like shown in FIG.

The cap 9 may be attached by using an adhesive, and the cork stopper 5 made of the synthetic resin binder may be further insert-molded to form a stopper, or may be assembled with glass or a synthetic resin molded product to form a stopper. Good. In order to increase the adhesive force when mounting the shade 9, the core hole 51 and the upper end 52 are surface-polished with a sander, so that strong adhesion can be achieved.

[0021]

Since the present invention is configured as described above, it has the following effects. This invention adopts a method of filling the gaps between cork particles with synthetic resin and forming a thick synthetic resin skin on the surface, eliminating the quality instability of natural cork stoppers, solving the problem of sulcus, and pressing cork stoppers. It is possible to very easily and inexpensively produce a new type of stopper that does not cause discoloration and has a small amount of alcohol scattered.

[Brief description of drawings]

FIG. 1 is a view showing a relationship between a raw material and a container before being put into a molding die in the present invention.

FIG. 2 is a diagram showing a state in which a raw material is formed in a mold.

FIG. 3 is a cross-sectional view of a cork stopper having a synthetic resin skin formed on the outer surface taken out from the mold.

FIG. 4 is an external view of a cork stopper made by the method of the present invention.

FIG. 5 is an enlarged view of a part within the circle of FIG.

FIG. 6 is an external view of a conventional natural cork stopper.

FIG. 7 is an external view of a conventional pressed cork stopper.

FIG. 8 is an enlarged view of a part within the circle of FIG.

FIG. 9 is an external view of a cork stopper joined by a normally molded synthetic resin binder.

FIG. 10 is an enlarged view of a part within the circle of FIG.

[Explanation of symbols]

 1 Container (Cup) 2 Synthetic Resin 3 Cork Particles 4 Raw Material 5 Plug 6 Outer Skin 7 Raw Disk 8 Mold 9 Cap

Claims (5)

[Claims] 1. A method of producing a cork stopper in which cork particles are bonded using a thermoplastic synthetic resin as a binder, wherein a predetermined amount of thermoplastic synthetic resin and cork particles are kneaded in a container made of thermoplastic synthetic resin. With a synthetic resin binder that fills the manufacturing material, puts it in a mold, and heats and presses it to form a cork stopper, and at the same time, forms a synthetic resin shell on the outer periphery of the stopper by melting the container. Cork stopper manufacturing method. 2. The raw material is made by kneading a predetermined amount of thermoplastic synthetic resin and cork particles with a pressure heating kneader, dispensing the mixture into a sheet, and then forming a disk having a diameter required for a cork stopper. The method for producing a cork stopper using the synthetic resin binder according to claim 1, wherein the molded product is packed in a mold and molded. 3. The raw material has a melting point of 80 ° C. to 130 ° C.
Of the thermoplastic synthetic resin and cork particles having a particle diameter of about 1 mm to 5 mm, and the thermoplastic synthetic resin is kneaded in the range of 100 to 400 parts by weight with respect to 100 parts by weight of the cork particles. The method of manufacturing a cork stopper using the synthetic resin binder according to claim 1 or 2. 4. A container (cup or bag) made of a thermoplastic synthetic resin is a synthetic resin that does not cause a problem when it is made of the same material or a stopper as the thermoplastic synthetic resin kneaded with cork particles. A method of manufacturing a cork stopper using the synthetic resin binder according to claim 1. 5. The synthesis according to claim 1, wherein the thermoplastic synthetic resin film forming the container (cup or bag) has a thickness of about 0.2 mm to 1.0 mm. A method for producing a cork stopper using a resin binder.