JPH07329947A - Plastic thin-wall container - Google Patents

Abstract

PURPOSE:To obtain a plastic thin-wall container that is remarkably reduced in resin amount in use and improved in buckling strength, can be crushed small to be disposed of, and has no possibility that the engagement of the container with a reinforcing container is loosened even if a body part of the container is deformed. CONSTITUTION:In a plastic thin-wall container 1 composed of a mouth part, a body part, and a bottom part and molded by an injection draw blow molding method, a mouth part 2 has a wall thickness of 2.0-3.0mm, and a body part 3 is 1-10 or less of the mouth part 2 in wall thickness. A flange part 4 having an engaging member to a reinforcing container is provided downward of the mouth part 2. Recessed parts are formed in the body part 3. A label 6 is integrally formed by in-mold molding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic container, and more particularly to a plastic thin container which can be made thin to save resources and which can be easily disposed of after use. In addition, it is a container with excellent buckling strength that can be used alone, and a plastic thin wall container that can be equipped with a pump dispenser and is suitable for discharging highly viscous contents such as shampoo and conditioner.

[0002]

2. Description of the Related Art Conventionally, it has been widely used to obtain transparent and highly rigid containers by injection stretch blow molding of synthetic resins such as polyester and polypropylene. In the fields of beverage containers, toiletries, cosmetics, etc. It is used. However, because containers made of synthetic resin have high calories burned and are bulky at the time of disposal, they are an environmental problem, and measures such as reducing the amount of synthetic resin used and making it reusable are needed. . Therefore, there is known a container in which the thickness of the container is reduced in order to reduce the amount of the synthetic resin used, but it has been difficult to achieve the desired thinness when molding by a usual blow molding method. That is, when molding by the blow molding method, since a parison of uniform thickness is sandwiched in a mold and air is blown into the container to make a container, it is stretched in the lateral direction according to the blow ratio, but is hardly stretched in the longitudinal direction. . Therefore, if you try to reduce the thickness of the body while maintaining a certain amount of mouth wall thickness,
This is because the diameter of the mouth must be reduced in order to increase the blow ratio, and if the wall thickness is reduced to the desired diameter, the blow ratio will not increase, and there is a limit to the reduction in wall thickness.

On the other hand, it has been proposed that a paper sleeve is attached to reinforce the strength of the thin-walled body, but a new process of setting the paper sleeve leads to an increase in production cost. There was a problem. Further, when the paper sleeve is engaged and fixed to the body portion of the container, the container is likely to be deformed by squeezing as the inner volume is reduced, so that the engagement with the paper sleeve may be disengaged.

[0004]

Therefore, the present invention significantly reduces the weight of the container from the viewpoint of reducing the amount of synthetic resin used, has excellent buckling strength, and can be used alone, and the body portion of the container is also improved. It is an object of the present invention to provide a plastic thin-walled container that is environmentally friendly and can be crushed into a small size at the time of disposal without being loosely engaged with the reinforcing container even if the container deforms.

[0005]

In order to solve the above-mentioned problems, the present invention provides a plastic thin-walled container comprising a mouth portion, a body portion and a bottom portion and molded by an injection stretch blow molding method. Has a wall thickness of 2.0 to 3.0 mm,
The body is a thin-walled plastic container characterized in that the thickness of the body is not more than 1/10 of that of the mouth.

It is desirable that a flange portion be continuously provided below the mouth portion, and that the flange portion be provided with a locking member for the reinforcing container.

It is desirable that a recess be formed in the body portion toward the inside of the container.

It is desirable that a label is integrated with the body by in-mold molding.

The material for the plastic thin-walled container of the present invention includes a thermoplastic resin such as polyester and polypropylene, a high barrier resin such as a copolymer having acrylonitrile or methacrylonitrile as a main component, or a thermoplastic resin. A blended or laminated gas barrier resin such as saponified ethylene-vinyl acetate copolymer or aromatic nylon can be used.

When a pump dispenser is attached to the mouth, it is desirable to attach a reinforcing container to enhance the buckling strength.

[0011]

According to the first aspect of the present invention, the water vapor barrier property, the oxygen gas barrier property, and the strength are improved by sufficiently stretching the body portion in the length and width by the injection stretch blow molding method. Therefore, the thickness of the body is 1/1 of the thickness of the mouth
The performance of the container does not deteriorate even though it is configured with a wall thickness of 0 or less.

According to the second aspect of the present invention, since the engaging member for the reinforcing container is provided on the flange portion below the mouth portion, even when the inner volume is reduced and the body portion is dented, Does not loosen.

According to the third aspect of the present invention, since the concave portion is formed in the body portion, it can be easily crushed.

According to the fourth aspect of the present invention, since the label is integrated with the body portion by the in-mold forming method, the thin body portion is not dented when the label is attached and the label is attached. Can be omitted, and since the end face of the label is not exposed, peeling is difficult.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. In this example, a translucent bottle was prepared by injection stretch blow molding using a polyethylene terephthalate resin. First, the bottle will be described with reference to FIGS. The bottle 1 includes a mouth portion 2 having a screw portion 2a and a body portion 3
And a bottom portion 5, and a flange portion 4 is formed below the screw portion 2a of the mouth portion 2.

As a molding procedure, first, injection molding is performed as shown in FIG.
A test tubular molded product as shown in
Called). This preform 13 has a mouth 14
And the barrel portion 15, and the barrel portion 3 and the bottom portion 5 of the bottle are formed by stretching the barrel portion 15 vertically and horizontally. Next, the preform 13 was inserted into a blow mold to which the label 6 was fixed in advance and stretch blown, and the label 6 was integrated with the body portion 3 while being sufficiently stretched in the longitudinal direction and the transverse direction.

The molded bottle 1 has a mouth 2 having a length of 2 to 3 m.
A screw portion 2a having a wall thickness of m for fitting with the cap is formed, and a flange portion 4 is formed below the screw portion. The flange portion 4 can be used for holding the container when it is transported or when the contents are filled, and the locking holes 4a are opened at two places and are also used for locking the reinforcing container. The locking hole 4a corresponds to the locking member in claim 2, and is not limited to this shape. For example, a locking projection is formed downward and the locking hole is formed in the reinforcing container. It can be provided and locked.

As shown in FIGS. 2 and 3, the body portion 3 has corner portions 3b protruding outward with R, and concave portions 3a are formed at four places except the parting line direction and the parting line right angle direction. . Therefore, if the contents are reduced, it tends to be crushed.

As shown in FIG. 3, unstretched polypropylene labels 6 are attached by in-mold molding to the front surface and the back surface of the four recesses 3a. This label 6 not only enhances the advertising / decorative effect at the store front of the container, but also serves to reinforce the thin body portion 3. Further, since the label 6 is integrated with the label during blow molding of the bottle, there is no risk of the bottle being deformed at this time, and the subsequent steps such as labeling, printing, and mounting of a paper sleeve can be omitted. This leads to a reduction in production cost, and because the end surface of the label 6 is not exposed, it does not come off easily,
Further, since the material of the label 6 is polypropylene, it has water resistance and can withstand use in a bathroom or kitchen.

When the size and wall thickness of this bottle 1 were measured, the amount of resin used was 40 g, and the full injection volume was 15
50 m, thickness of mouth 2 is 3 mm, thickness of body 3 is 300
and was 1/10 of the wall thickness of the mouth. The thickness of the bottom was 3 mm, which was a sufficient thickness.

Among those skilled in the art, as an expression expressing the relationship between the full-filled volume (V) of the blow-molded container and the amount of resin used (W), W = α × V ^2/3 (α value is A relational expression (a coefficient that varies slightly depending on the type and container shape) is used, and in many conventional bottles, this α value is around 0.6, and even with recent thin-walled containers, the limit is around 0.4. there were. However, in this embodiment, the α value is 0.30.
I was able to From this, it can be seen that in this example, the amount of resin used could be markedly reduced compared to the conventional case.

As another example, a bottle having a full pouring volume of 1030 ml was produced by using 30 g of polypropylene resin by the same molding method as in the above example. The α value in this case was 0.29, and a thin-walled bottle was obtained as in the above-mentioned Examples.

The prepared bottle 1 was filled with the shampoo liquid, held by hand, inverted, and repeatedly poured out little by little, but the bottle 1 was usable without being deformed. After use, the body 3 of the bottle was crushed by hand and discarded. Therefore, the waste capacity could be made much smaller than before.

Next, bottle 1 is filled with shampoo liquid,
As shown in FIG. 5, a polypropylene-made reinforcing container 7 is mounted below the flange portion 4, and a locking projection 8a formed on a concave step 12 provided on the top surface 8 of the reinforcing container 7 shown in FIG.
Is fitted into the locking hole 4a of the flange 4 and fixed, and the container cap 1 of the pump dispenser 16 is attached to the mouth 2.
7 was screwed on and the nozzle head 18 was pressed from above to discharge the shampoo liquid. The reinforcing container 7 has a rear surface 9 opened and a bottom surface 10 formed with leg portions 11 projecting outward from the rear surface 9 side. The reinforcing container 7 is designed so that a bottle can be inserted from the rear surface 9 side and can stand upright. Has been done. Further, since the flange portion 4 of the bottle 1 is placed on the concave step portion 12 provided on the top surface 8, the surface is flush.

As the shampoo liquid was discharged, the inside of the bottle 1 was depressurized, and the concave portion 3a of the body portion 3 was crushed inward. However, since the flange portion 4 of the bottle and the reinforcing container 7 were securely fixed, the fixing did not become loose despite the recess of the body portion, and therefore the bottle 1 was reinforced vertically and did not fall over until the end and the pump dispenser. 16 could be moved up and down and discharged. After discharging, the pump dispenser 16 and the reinforcing container 17 were removed, and the bottle 1 was crushed and discarded. Therefore, the waste capacity could be made much smaller than before. The pump dispenser 16 and the reinforcing container 7 are reused.

[0026]

According to the first aspect of the present invention, the vapor barrier property, the oxygen gas barrier property and the strength are improved by sufficiently stretching the body part in the length and width by the injection stretch blow molding method. The thickness of the body is 1/1 of the thickness
The performance of the container does not deteriorate even though the container is formed with a wall thickness of 10 or less. Therefore, it is possible to reduce the amount of resin used in the container, reduce costs, and protect the environment.

According to the second aspect of the present invention, since the engaging member for the reinforcing container is provided in the flange portion below the mouth portion, even when the inner volume is reduced and the body portion is recessed, Does not loosen.

According to the third aspect of the present invention, since the concave portion is formed in the body portion, it can be easily crushed, and the volume of waste can be reduced.

According to the fourth aspect of the present invention, since the label is integrated with the body by the in-mold forming method, it is possible to decorate the thin container with the label without deforming it and a separate step of decorating. By omitting, the production cost can be reduced and the thin body can be reinforced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment.

FIG. 2 is a vertical sectional view of FIG.

FIG. 3 is a plan view of FIG.

FIG. 4 is a sectional view showing a preform of one example.

FIG. 5 is a perspective view showing a state where a pump dispenser and a reinforcing container are attached to a bottle.

FIG. 6 is a perspective view of a reinforcing container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Bottle 2 ... Mouth part 2a ... Screw part 3 ... Body part 3a ... Recessed part 3b ... Corner part 4 ... Flange part 4a ... Locking hole 5 ... Bottom part 6 ... Label 7 ... Reinforcing container 8 ... Top surface 8a ... Locking protrusion 9 ... Back surface 10 ... Bottom surface 11 ... Leg part 12 ... Recessed step part 13 ... Preform 14 ... Mouth part 15 ... Cylindrical part 16 ... Pump dispenser 17 ... Container cap 18 ... Nozzle head

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuyuki Ohno 1-5-1 Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd.

Claims (4)

[Claims] 1. A thin plastic container made of an injection stretch blow molding method, comprising a mouth, a body and a bottom, the mouth having a wall thickness of 2.0 to 3.0 mm. The thin-walled container made of plastic, characterized in that the portion has a thickness not more than 1/10 of the mouth portion. 2. The plastic thin-walled container according to claim 1, wherein a flange portion is continuously provided below the mouth portion, and an engaging member for the reinforcing container is provided on the flange portion. 3. The plastic thin-walled container according to claim 1 or 2, wherein a recess is formed in the body portion toward the inside of the container. 4. The plastic thin-walled container according to claim 1, wherein a label is integrated with the body by in-mold molding.