JP2004352265A - Bottle-type laminate container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bottle-type laminate container excellent in self-supportability having a simple appearance shape without increasing a resin quantity. <P>SOLUTION: A bottle 10 is formed by laminating two resins A and B with different factors of shrinkage. A truncated-cone-shaped space consisting of a raised bottom 1a where the bottle 10 is inwardly dented on the bottom 10d of the bottle 10 and a tapered part 1b connecting the raised bottom 1a with an annular grounding region f where the bottle 10 is inwardly dented with the region f left. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a bottle-type laminated container formed by laminating at least two resins having different shrinkage rates.
[0002]
[Prior art]
The bottle-type container is intended to be self-supporting with its bottom grounded to a shelf or the like, and it is not possible to form a dome-shaped space at the bottom where the laminated container is recessed with an inward radius of curvature while leaving a contact area. Is known.
[0003]
Also, a bottle-type laminated container formed by laminating two or more resins is known, and such a bottle-type laminated container is used as a container for filling various contents, such as cosmetics, toiletry products, foods, and pharmaceuticals. Have been.
[0004]
Such containers are usually formed using a molding method such as extrusion blow molding or biaxial stretch blow molding, and the shape is usually designed in consideration of the shrinkage rate after cooling and solidification of the resin. It is. However, for example, when two resins A and B are laminated and extrusion blow-molded, a parison obtained by extruding a molten molding material in a laminated state is sandwiched between molds and blown. Therefore, if the contraction rates of the resins A and B are different, as shown by reference numeral 22 in FIG. 3A, the bottom 21 of the bottle-type laminated container is recessed to form a dome-shaped space formed with the same curvature. Even if it does so, since the difference of shrinkage arises between resin A and B by cooling with a metal mold, the dent 22 may fall as shown in FIG.3 (b).
[0005]
As described above, if the recess 22 forming the dome-shaped space falls and bulges outward, there arises a problem that the container becomes unstable and shakes or falls. Therefore, conventionally, in order to prevent the depression 22 provided in the bottom portion 21 from dropping, a rib for reinforcement is provided in the depression 22 (for example, see Patent Document 1).
[0006]
[Patent Document 1]
JP-A-3-187829
[Problems to be solved by the invention]
However, such a conventional technique has a disadvantage that the reinforcing rib provided on the bottom portion 21 becomes an obstacle and an extra amount of resin is required for the rib.
[0008]
The present invention has been made in view of such a fact, and an object of the present invention is to provide a bottle-type laminated container having a simple external shape and an excellent self-sustainability without increasing the amount of resin.
[0009]
[Means for Solving the Problems]
The invention according to claim 1, which is the present invention, relates to a bottle-type laminated container formed by laminating at least two resins having different shrinkage ratios, wherein the laminated container is formed by leaving a contact area at the bottom of the laminated container. It is characterized by forming a truncated conical space depressed in the direction.
[0010]
In the invention according to claim 2, the outermost layer of the bottle-type laminated container is made of a glossy resin.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1A is a partial cross-sectional view showing a bottle-type laminated container (hereinafter, simply referred to as “bottle”) 10 according to an embodiment of the present invention from the side. FIG. 1B is an enlarged view of a main part showing FIG. 1A from the direction D1, and FIG. 1C is a plan view showing FIG. 1A from the direction D2.
[0012]
The bottle 10 is a cosmetic container for filling a lotion or the like, and as shown in FIG. 1 (a), is composed of two resins, an ethylene-vinyl acetate alcohol copolymer (EVOH) and a high-density polyethylene (HDPE). A parison obtained by extruding A and B into a laminate is blow-molded. That is, the bottle 10 is referred to as a resin (EVOH) A having a small shrinkage ratio of 0.7 to 0.8% and a resin (HDPE) B having a shrinkage ratio of 2 to 5% and a larger shrinkage ratio than the resin A. A parison extruded in a molten state by laminating two resins A and B having different shrinkage ratios is sandwiched by a mold, blown, and then cooled and molded by the mold.
[0013]
The external shape of the bottle 10 is connected to the body 10c from the mouth 10a via the shoulder 10b, and has a bottom 10d at the lower end of the body 10c. The bottom 1Od is provided with a recess 1 described later.
[0014]
FIG. 2 is a cross-sectional view taken along the line CC of FIG. 1C, and the dent 1 will be described below with reference to FIG. The depression 1 forms a truncated conical space in which the bottle 10 is depressed inward leaving an annular contact area f, as shown by the hatched area in FIG. 1C. Specifically, as shown in FIGS. 1 and 2, the dent 1 includes an upper bottom 1 a formed by indenting the bottle 10 inward about the axis O of the bottle 10, and an annular contact area f with the upper bottom 1 a. And a tapered portion 1b connecting between the two. The symbol PO in FIG. 1 is a pinch-off portion cut off by pinch-off during stretch blow molding. In FIG. 2, the pinch-off portion PO is omitted for simplification of description.
[0015]
According to such a configuration, even if a difference in shrinkage occurs due to the cooling in the mold due to the difference in shrinkage ratio between the resins A and B, as shown in FIG. The recess 1 does not fall out of the bottle 10 because of the flat pulling at 1a. In other words, in the bottle 10, it is possible to prevent the dent from dropping due to the difference in shrinkage between the resins A and B without providing a reinforcing rib or the like that becomes an obstacle by increasing the amount of resin.
[0016]
Therefore, the bottle 10 according to the present invention is a bottle-type laminated container having a simple external shape and an excellent self-sustainability without increasing the amount of resin.
[0017]
Further, according to the present embodiment, since the resin is hardly affected by the difference in shrinkage between the resins A and B, the thickness of the container can be thinner than that of the conventional bottle-type laminated container. In particular, when the outermost layer of the bottle 10 is made of glossy resin A such as EVOH as in the present embodiment, the glossiness is improved as compared with a conventional bottle-type laminated container.
[0018]
The foregoing merely illustrates preferred embodiments of the present invention, and those skilled in the art will be able to make various modifications within the scope of the appended claims. For example, the resin to be used is not limited in the present embodiment. For example, a low-density polyethylene having a shrinkage of 1.5 to 3.5%, a polypropylene having a shrinkage of 0.6 to 3.0%, 0.2 Various resins such as polyethylene terephthalate of up to 0.9% can be adopted, and combinations thereof are also appropriately selected. Further, the layer configuration forming the bottle-type laminated container may be two or more layers, and the type thereof is not particularly limited, for example, an adhesive layer is disposed between the layers. Also, the molding method is not limited to blow molding, but may be any molding method such as injection molding that melts and cools the resin. Also, the contact area f of the bottle 10 may not be a face contact as in the present embodiment, but may be a line contact at a broken line portion in FIG.
[0019]
【The invention's effect】
Therefore, according to the present invention, since the bottom of the bottle-shaped laminated container is formed with a frustoconical space in which the bottle-shaped laminated container is inwardly recessed while leaving a contact area, the contraction rate of the resin is different. Even if there is a difference in shrinkage, the shrinkage force becomes a flat tension, so that the recess provided on the bottom does not fall outward of the bottle-type laminated container. That is, in the present invention, it is possible to prevent the dent from dropping due to the difference in shrinkage of the resin, without providing a reinforcing rib or the like that becomes an obstacle by increasing the amount of the resin.
[0020]
Therefore, according to the first aspect of the present invention, it is possible to provide a bottle-type laminated container having a simple appearance and excellent in self-sustainability without increasing the amount of resin.
[0021]
Further, according to the first aspect of the present invention, the container is hardly affected by the difference in shrinkage of the different resins, so that the thickness of the container can be thinner than that of a conventional bottle-type laminated container.
[0022]
In particular, when the outermost layer of the bottle-type laminated container is made of a glossy resin, the glossiness is improved as compared with the conventional bottle-type laminated container.
[Brief description of the drawings]
FIG. 1A is a partial cross-sectional view showing a bottle-type laminated container according to one embodiment of the present invention from the side, FIG. 1B is an enlarged view of a main part showing FIG. () Is a plan view showing (a) from the direction D2.
FIG. 2 is a sectional view taken along line CC of FIG. 1 (c).
FIG. 3 is a cross-sectional view of a main part showing the bottom of a conventional bottle-type laminated container from the side.
[Explanation of symbols]
1 recess 1a upper bottom 1b taper part 10 bottle (bottle type laminated container)
f Grounding area A, B resin

Claims (2)

In a bottle-type laminated container formed by laminating at least two resins having different shrinkage rates,
A bottle-shaped laminated container characterized by forming a truncated cone-shaped space in which the laminated container is inwardly recessed while leaving a contact area at the bottom of the laminated container. The bottle-type laminated container according to claim 1, wherein the outermost layer of the bottle-type laminated container is made of a glossy resin.

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