JP2003261126A - Plastic container and production method for the container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plastic container which has an improved decorative effect or the like by providing a partially glossy portion, the glossiness of which is higher than the other portions, on part of the container without needing an expensive material or an addition agent or an additional processing step, and to provide a production method for the container. <P>SOLUTION: The plastic container is obtained by blow molding with a mold having a synthetic resin layer formed partially on the surface of the mold. Thus, the plastic container having on part of it a partially glossy portion the glossiness of which is higher than the other portions (preferably, a glossiness difference of 30 or more) is produced. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic container having a partially glossy surface on the container surface and a method for producing the same.

[0002]

It is well known that containers such as bottles for containing foods, cosmetics, detergents, etc. are made of various plastic materials, for example, polyolefin resins such as polyethylene and polypropylene; nylon 6, nylon 66.
Polyamide resin such as polyethylene terephthalate (P
Various single-layer or multi-layer plastic bottles made of polyester resin such as ET) have been proposed.

In order to impart surface gloss and transparency to these containers and to give them a decorative effect, additives such as pearlescent agents and crystal nucleating agents are added to the materials constituting the containers, Various methods of chemically or physically treating the surface of the container have been proposed. However, these conventional techniques require expensive materials and additives and require additional processing steps, which causes an increase in the cost of containers. In addition, depending on these technologies, it is possible to enhance the decorative effect by making a part of the container glossy.
It was difficult.

[0004]

SUMMARY OF THE INVENTION The present invention overcomes these disadvantages of the prior art by eliminating the need for expensive materials, additives, and additional processing steps in some parts of the container over other parts. An object of the present invention is to provide a plastic container having a decorative effect and the like and a method for producing the same by providing a partial glossy portion having a high gloss value.

[0005]

Means for Solving the Problems As a result of intensive studies by the present inventors, when molding a plastic container, by molding using a mold having a synthetic resin layer partially on the mold surface, The present invention has been completed by discovering that a plastic container having a partially glossy portion can be obtained. That is, the present invention has the following configurations. 1. A plastic container characterized in that a part of the container has a glossy part having a higher gloss value than other parts. 2. 2. The plastic container according to 1, wherein the partially glossy portion is formed without addition of an additive into the container or surface treatment after molding the container. 3. 3. The plastic container according to 1 or 2, wherein the difference in gloss value between the partially glossy portion and the other portion is 30 or more. 4. 4. The plastic container according to any one of 1 to 3, wherein the gloss value of the partially glossy portion is 70 or more. 5. The plastic container according to any one of claims 1 to 4, wherein a pattern is formed by the partially glossy portion. 6. 6. The plastic container according to any one of 1 to 5, wherein the container is made of a polyolefin resin. 7. 7. The method for producing a plastic container according to any one of 1 to 6, wherein the mold is blow-molded using a mold having a synthetic resin layer partially on the mold surface. 8. 8. The method for producing a plastic container according to 7, wherein the mold is used in which the synthetic resin layer is formed by coating the surface of the mold or adhering a synthetic resin film. 9. 8. The method for manufacturing a plastic container according to 7, wherein a mold formed by inserting a synthetic resin member into a concave portion provided with a synthetic resin layer on the surface of the mold is used. 10. The method for producing a plastic container according to any one of 7 to 9, wherein the temperature of the mold during blow molding is set to 25 to 80 ° C.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Examples of the material constituting the plastic container of the present invention include crystalline polypropylene, crystalline propylene-ethylene copolymer, crystalline polybutene-
1, crystalline poly-4-methylpentene-1, low-, medium-,
Alternatively, polyolefins such as high-density polyethylene, ethylene-vinyl acetate copolymer (EVA), saponified EVA, ethylene-ethyl acrylate copolymer (EEA), ion-crosslinked olefin copolymer (ionomer); polystyrene, styrene- Aromatic vinyl copolymers such as butadiene copolymers; vinyl halide polymers such as polyvinyl chloride and vinylidene chloride resins; polyacrylic resins; acrylonitrile-styrene copolymers, acrylonitrile-styrene-butadiene copolymers, etc. Nitrile polymers; Polyesters such as polyethylene terephthalate and polytetramethylene terephthalate; Various polycarbonates;
Fluorine-based resins; thermoplastic resins such as polyacetals such as polyoxymethylene can be mentioned. These thermoplastic resins may be used alone or in a blend of two or more.

Particularly preferred materials are low-, medium-,
Alternatively, polyolefins such as high density polyethylene, crystalline polypropylene, crystalline ethylene-propylene copolymer, etc. may be mentioned. In a container made of polyolefin, it is more difficult to impart surface glossiness to a container made of another thermoplastic resin, and it is extremely difficult to form a partially glossy part in the container. According to this, a polyolefin container having a partially glossy portion can be easily obtained at low cost.

The plastic container of the present invention includes, in addition to the above-mentioned single-layer container made of a thermoplastic resin, a layer made of these thermoplastic resins, a gas barrier resin, and a scrap resin generated at the time of molding the container. It can be configured as a multi-layer container having layers. A suitable material for forming the gas barrier resin layer has an ethylene content of 2
Saponified ethylene / vinyl acetate copolymer having a degree of saponification of 0 to 50 mol% and 95 mol% or more, and a polyamide having 3 to 30, especially 4 to 25 amide groups per 100 carbon atoms. The kind is mentioned. These gas barrier resins can be used alone or in admixture of two or more, and other thermoplastic resins may be mixed within a range that does not impair the properties. If desired, an adhesive resin layer can be provided between the resin layers constituting the multilayer plastic container. The adhesive resin is not particularly limited, but is acid-modified olefin resin, for example, graft-modified with an ethylenically unsaturated carboxylic acid such as maleic anhydride, acrylic acid, methacrylic acid, or itaconic anhydride or an anhydride thereof. Polyethylene, polypropylene, ethylene / α
-It is preferable to use an olefin copolymer or the like.

A plastic container having a gloss part having a gloss value higher than other parts in a part of the container of the present invention is a plastic container using a mold partly having a synthetic resin layer on the mold surface. It can be obtained by blow molding, and the portion corresponding to the synthetic resin layer on the surface of the mold becomes smooth and a partial glossy portion is formed. For a mold having a synthetic resin layer partially on the mold surface, (1) a paint containing a synthetic resin as a coating film forming component is applied to the mold, and (2) a synthetic resin film is attached to the mold. And (3) providing a recess on the surface of the mold and inserting a synthetic resin member, or the like.

The synthetic resin used in the mold is not particularly limited, and any thermoplastic resin or thermosetting resin having sufficient heat resistance at the temperature of the mold during molding can be used. . Preferred synthetic resins include, for example, polyimide, polyamideimide, polybenzimidazole, polyimidazopyrrolone, polyetheretherketone, polyphenylene sulfide, polytetrafluoroethylene, polytrifluoroethylene chloride, polyvinylidene fluoride, ethylene tetrafluoride. —Propylene hexafluoride copolymer and the like.

According to the present invention, a plastic container is simply molded by using such a mold, thereby eliminating the need for expensive materials, additives, and additional processing steps, and forming a part of the container. It is possible to obtain a plastic container having a partial glossy portion having a gloss value higher than that of the portion. In the present invention, the gloss value (glossiness) of the plastic container means a value measured at a measurement angle of 60 degrees using a normal gloss meter.

The gloss value of the partially glossy portion is preferably 70 or more, and the gloss value thereof is 30 more than that of other portions.
When it is higher than the above, the contrast between the glossy portion and other portions becomes vivid, and an excellent decorative effect can be obtained, which is particularly preferable. The shape, size and position of the partially glossy portion can be arbitrarily selected. For example, as shown in FIG. 1, in the circumferential direction of the bottle body 1, for example,
The partial glossy portion 2 can be formed over three or more. Further, as shown in FIG. 2, a partial glossy portion 2 is formed in the height direction of the bottle body 1 over, for example, ½ or more, and the remaining amount of the contents accommodated in the bottle is passed through this partial glossy portion 2. May be confirmed. further,
As shown in FIG. 3, the island-shaped partial glossy portion 2 may be formed on the bottle body 1. Also, as seen in FIG.
You may form combining a some glossy part. Further, the shape and size of the bottle itself can be arbitrarily set, and the cross-sectional shape of the bottle body is, for example, (a) in FIG.
As shown in (b) and (C), it may have any shape such as a circle, an ellipse, a substantially quadrangle, and an asymmetric cross-sectional shape.

Further, as shown in FIG. 6 or FIG. 7, a logo such as a company name or a product name or a pattern such as a figure is formed by the partial glossy portion alone or by combining the partial glossy portion with other portions. The decoration effect may be further enhanced. The plastic container having the partially glossy portion of the present invention has a decorative effect not found in conventional plastic containers, and products in which various contents are filled in such a plastic container are not noticeable to consumers. It has a very high practical value, such as pulling and motivating purchase.

The plastic container having a partially glossy portion of the present invention can be manufactured by a usual method such as blow molding, vacuum molding or pressure molding. As a preferred molding method of a multilayer container, a parison obtained by coextruding each resin layer constituting the container using a multilayer multiple die, a method of forming a hollow plastic container by blow molding in a blow mold, Examples thereof include a method of molding a multilayer plastic laminated material forming a container into a shape such as a tray or a cup by vacuum or pressure molding.

When a plastic container having a partially glossy portion such as a bottle is manufactured by blow molding, the temperature of the mold during blow molding is 10 to 10 times higher than the temperature of a normal mold.
It is preferable to set it high in the range of 50 ° C. For example,
When a bottle is manufactured by blow molding of a polyolefin resin, the temperature of the mold is usually set to about 15 to 20 ° C., but by setting the mold temperature as high as about 25 to 80 ° C., The temperature difference between the synthetic resin layer of the mold and the surface of the mold other than that becomes remarkable, and it becomes possible to form a partially glossy portion having a higher gloss value.

The plastic container having a partially glossy portion of the present invention is a food (dressing, edible oil, mayonnaise, sauce, soy sauce, various seasonings, etc.), beverage (mineral water, fruit juice drink, milk drink, coffee drink, carbonated drink). , Alcoholic beverages, etc.), detergents (kitchen detergent, laundry detergent, cleanser, toilet detergent, bathroom detergent, household detergent, etc.),
Cosmetics (lotion, foundation, hair tonic, hair liquid, cologne, emulsion, etc.), other daily necessities (shampoo, hair rinse, hair treatment,
Widely used as a container to store various contents such as body soap, hand soap, laundry bleach, kitchen bleach, softener, mildew remover, bactericide, etc. such as liquid, gel, powder, and granules. It can be used, and is particularly preferably used as a bottle for containing a liquid content such as a liquid or a gel.

[0017]

EXAMPLES The present invention will be specifically described below with reference to examples, but these specific examples do not limit the present invention. (Manufacture of Container) In the following examples, a plastic container (bottle) was manufactured in the following manner and its properties were evaluated. A pipe-shaped molten resin obtained by extruding a plastic material with a 50 mm extruder (L / D = 25) was sandwiched between bottle molds, and a thickness of about 0.
Blow molding was performed by blowing 5 MPa of air for 12 seconds. The obtained bottle has a basis weight of about 35.8 g and a capacity of 720.
It was ml. (Gloss value measurement) As a measuring device, Nippon Denshoku Industries Co., Ltd.
Made Color Measuring System Σ
The measurement was performed using an 80 gloss meter VGS-SENSOR at a measurement angle of 60 degrees.

(Example 1) High-density polyethylene manufactured by Mitsui Chemicals Co., Ltd., "HIZEX 6008B" was used as a bottle constituent material, and Kapton tape (polyimide resin tape) manufactured by Permacel was stacked on the mold as shown in Table 1 below. Then, a synthetic resin layer was partially formed by pasting and the mold temperature was kept at 15 ° C. for blow molding. The bottle obtained is
The bottle had a partly glossy portion corresponding to the tape. Table 1 shows the results of the gloss value measurement of the partially glossy portion.

[0019]

[Table 1]

(Example 2) Polypropylene manufactured by Sumitomo Chemical Co., Ltd., "Sumitomo Noprene S-131DG" was used as a bottle constituent material, and four Kapton tapes manufactured by Permacel were attached to a mold and partially synthesized. A resin layer was formed and blow molding was performed while maintaining the mold temperature at 15 ° C. The obtained bottle was a bottle having a partial gloss in the portion corresponding to the tape. The gloss value of the glossy part is 8
It was 8.3%.

(Example 3) Main material (inner layer) of bottle is polypropylene manufactured by Sumitomo Chemical Co., Ltd., "Sumitomo Noprene S-131DG", sub material (outer layer) is polypropylene manufactured by Grand Polymer Co., Ltd., Grand Polypro J80
2H ”/“ High-density polyethylene manufactured by Nippon Polychem Co., Ltd. ”
Novatec HD HB532N ”= 80/20 In order to obtain a two-kind two-layer bottle composed of a blend, four Kapton tapes manufactured by Permacel are laminated and attached to a mold to partially form a synthetic resin layer, Mold temperature 15
Blow molding was performed while maintaining the temperature at ℃. The obtained bottle was frosted glass as a whole, but the portion corresponding to the tape was partially glossy. The gloss value of the partially glossy portion was 82.5%.

(Example 4) High-density polyethylene manufactured by Mitsui Chemicals Co., Ltd., "HIZEX 6008B" was used as a bottle constituent material, and Kapton tape manufactured by Permacel Co. was attached to the mold in the number shown in Table 2 below. Then, a synthetic resin layer was formed, and blow molding was performed while maintaining the mold temperature at 30 ° C. The obtained bottle was a bottle having a high gloss in a part corresponding to the tape. Table 2 shows the results of the gloss value measurement of the partially glossy portion.

[0023]

[Table 2]

Comparing Tables 1 and 2, in Example 4, by setting the mold temperature at the time of blow molding to be higher, the gloss was much higher than that in Example 1 molded at a normal mold temperature. It can be seen that a partially glossy part having a value was obtained.

(Comparative Example 1) High density polyethylene "HIZEX 6008B" manufactured by Mitsui Chemicals, Inc. was used as a bottle constituent material, and a partially mirror-finished mold was kept at 15 ° C for blow molding. The obtained bottle did not have gloss. The gloss value of the mirror-finished portion was 9.5%.

COMPARATIVE EXAMPLE 2 Polypropylene "Sumitomo Noprene S-131DG" manufactured by Sumitomo Chemical Co., Ltd. was used as a bottle constituent material, and a partially mirror-finished mold was kept at 15 ° C. for blow molding. The obtained bottle did not have gloss. The gloss value of the mirror processed part is 23.3%
Met.

(Comparative Example 3) In order to obtain a two-kind two-layer bottle made of the same material as in Example 3, a partially mirror-finished mold was kept at 15 ° C. for blow molding. The obtained bottle did not have gloss. The gloss value of the mirror-finished portion was 9.6%.

(Comparative Example 4) High density polyethylene "HIZEX 6008B" manufactured by Mitsui Chemicals, Inc. was used as a bottle constituent material, and a partially mirror-finished mold was kept at 30 ° C for blow molding. The obtained bottle did not have gloss. The gloss value of the mirror-finished portion was 17.1%.

According to Examples 1 to 4 above, a plastic container is blow-molded using a mold in which a synthetic resin layer is partially formed on the mold surface, so that a partially glossy portion is formed on the container surface. It is possible to obtain a plastic container having an excellent decorative effect. In addition, the temperature of the mold at the time of blow molding,
By setting the temperature higher than the normal temperature by about 10 to 50 ° C., it is possible to form a partially glossy portion having a higher gloss value. In each of the above examples, the synthetic resin layer was partially formed on the mold surface by sticking the synthetic resin tape, but the mold surface was partially formed on the mold surface by another method such as painting or inserting a synthetic resin member. Of course, a synthetic resin layer may be formed.

[0030]

According to the present invention, expensive materials and additives,
A plastic container having an improved decorative effect can be obtained by providing a part of the container with a gloss part having a higher gloss value than other parts without requiring an additional treatment step. The gloss value of this glossy part is 30 more than that of other parts.
When it is set higher than the above, the contrast between the glossy portion and the other portion becomes vivid and an excellent decorative effect can be obtained.
It is also possible to confirm the remaining amount of the contents stored in the bottle through this partial glossy portion. When a pattern such as a logo or a figure such as a company name or a product name is formed by using the partial glossy portion alone or by combining the partial glossy portion with another portion, the decorative effect can be further exhibited. . The plastic container having the partially glossy portion of the present invention has a decorative effect not seen in conventional plastic containers, and has a very high practical value such as attracting the attention of consumers and stimulating the purchase will. Is.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a plastic container having a partially glossy portion of the present invention.

FIG. 2 is a diagram showing another example of a plastic container having a partially glossy portion of the present invention.

FIG. 3 is a diagram showing another example of a plastic container having a partially glossy portion of the present invention.

FIG. 4 is a view showing another example of the plastic container having the partially glossy portion of the present invention.

FIG. 5 is a diagram showing an example of a cross-sectional shape of a body of a plastic container having a partially glossy portion of the present invention.

FIG. 6 is a view showing another example of the plastic container having the partially glossy portion of the present invention.

FIG. 7 is a diagram showing another example of a plastic container having a partially glossy portion of the present invention.

[Explanation of symbols]

1 bottle body 2 partial gloss

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) // B29K 23:00 B29L 22:00 B29L 22:00 B65D 1/00 C (72) Inventor Junichi Matsuo Kanagawa 1-8 Shimotani-cho, Tsurumi-ku, Yokohama-shi, Toyo Seikan Co., Ltd. Technical section Tsurumi branch room F term (reference) 3E033 AA01 BA14 BB08 CA20 DB01 DB03 DD01 EA09 FA03 3E062 AA03 AA09 AA10 AB01 AB07 AB08 AC02 BB06 BB10 DA01 JB21 JC02 4F202 AA03 AF14 AG07 AG26 AH55 AJ03 AJ09 AR06 CA11 CB01 CD22 CK11 CK43 CN01

Claims (10)

[Claims] 1. A plastic container characterized in that a part of the container has a glossy portion having a gloss value higher than that of other portions. 2. The plastic container according to claim 1, wherein the partially glossy portion is formed without adding an additive to the container or performing surface treatment after molding the container. 3. The plastic container according to claim 1, wherein the gloss value difference between the partially glossy portion and the other portion is 30 or more. 4. The plastic container according to claim 1, wherein the gloss value of the partially glossy portion is 70 or more. 5. The plastic container according to claim 1, wherein a pattern is formed by the partially glossy portion. 6. The plastic container according to claim 1, wherein the container is made of a polyolefin resin. 7. The method for producing a plastic container according to claim 1, wherein the mold is blow-molded using a mold having a synthetic resin layer partially on the mold surface. . 8. The method of manufacturing a plastic container according to claim 7, wherein a mold in which the synthetic resin layer is formed by coating the surface of the mold or adhering a synthetic resin film is used. 9. The method of manufacturing a plastic container according to claim 7, wherein a mold is used in which the synthetic resin layer is formed by inserting a synthetic resin member into a recess provided on the surface of the mold. 10. The temperature of the mold during blow molding is 25 to 8
The method for producing a plastic container according to any one of claims 7 to 9, wherein the temperature is set to 0 ° C.