JP2012100737A - Multilayer cosmetic container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively express desired appearance of an inner container by making the inner container and an outer container closely stuck to each other in a multilayer cosmetic container.SOLUTION: In the multilayer cosmetic container, an inner hollow container, having a hollow inside and made of synthetic resin, is provided with one neck part forming an opening, a barrel part thicker than the diameter of the neck part, and a shoulder part connecting a barrel part and a neck part. The entire outside of the inner hollow container excluding the neck part and the shoulder part or a part or all of the neck part is overmolded, as an outer layer, by injecting a transparent or translucent melted resin. This multilayer cosmetic container is characterized in that, on the circumference of the neck or the shoulder part which is closest to the outside exposed part of the inner hollow container having no outer layer and which is overmolded with the outer layer, there is formed continuously or intermittently a groove-shaped engaging recess or a rib-shaped engaging projection, and that the engaging recess or the engaging projection is covered with the outer layer which is formed by the injection molding.

Description

  The present invention relates to a multilayer cosmetic container in which an inner hollow container is covered with a transparent or translucent outer layer.

  There is a multilayer cosmetic container in which an opaque inner hollow container is covered with a transparent or translucent outer layer (hereinafter referred to as overmolding) (see, for example, Patent Document 1). This type of container not only improves the strength of the entire container by protecting the inner hollow container by the outer layer, but also shows a unique appearance by showing the original appearance of the inner hollow container through the outer layer. Excellent decorativeness. For this reason, it is used as a cosmetic container that places importance on durability and appearance.

Patent 4377447

  However, in a multilayer cosmetic container having a structure in which a part of the inner hollow container, in particular, the neck part forming the opening is exposed without being covered by the outer layer, if an impact is applied to the neck part due to dropping or the like, In some cases, the inner hollow container and the outer layer that were in close contact with each other were peeled off at the boundary between the portion with and without the layer. When an air layer is formed between the inner hollow container and the outer layer due to the peeling, the multilayer cosmetic container has an appearance such that a stain is generated inside the wall surface. Since the liquid enters the peeled portion, the spot-like gap becomes more conspicuous, and there is a problem that the value as a container in which appearance is important is greatly impaired.

  In addition, molding conditions such as pressure are strictly controlled in order to mold a hollow inner hollow container, but the filling rate in the mold cavity depends on the material filling amount of the outer layer part and variations in the inner hollow container. There was a problem that adverse effects occurred by relatively increasing or decreasing.

  For example, when the inner hollow container is small, the outer hollow container outer surface and the filling portion in the overmold mold increase, resulting in insufficient filling, and the engagement concave portion or the engagement convex portion is not sufficiently formed. In addition, the adhesion holding force of the outer layer portion may be insufficient.

  On the contrary, if the inner hollow container is larger, the outer layer portion filling amount will decrease even if the molding conditions and filling amount are constant, and it will be relatively overfilled and the pressure of the outer layer resin will be hollow. It can happen that the inner hollow container is deformed and distorted as a result.

  The object of the present invention is to prevent peeling of the multilayer cosmetic container at the boundary between the exposed inner hollow container and the overmolded outer layer, and to maintain close contact between the inner hollow container and the outer layer. Another object is to improve productivity by preventing deformation of the inner hollow container during overmolding.

A typical configuration of the present invention for achieving the above object is as follows.
An inner hollow container made of a synthetic resin having a neck portion that forms an opening, a body portion that is thicker than the diameter of the neck portion, a shoulder portion that connects the body portion and the neck portion, and a hollow interior. In the multi-layer cosmetic container in which the neck and shoulders, or the entire outside of the inner hollow container excluding part or all of the neck, is overmolded by injecting a transparent or translucent molten resin as an outer layer. Groove-like engagement recesses or rib-like engagement projections are continuous or intermittent on the circumference of the neck or shoulder that is overmolded with the outer layer, which is closest to the exposed portion outside the inner hollow container without the layer The engagement recess or the engagement protrusion is covered with the outer layer formed by injection molding.

  Moreover, the said engagement recessed part or the said engagement convex part may be formed in the peripheral part of the neck part or shoulder part of an internal hollow container.

  In addition, the molten resin forming the outer layer covering the engaging recess or the engaging protrusion installed on the periphery of the neck or shoulder of the inner hollow container is used to form the engaging recess or the engaging protrusion in the injection molding process. After covering, a resin reservoir may be provided so as to be further filled in the mold.

  With the above configuration, in the multi-layered cosmetic container, it is possible to prevent the peeling phenomenon between the inner hollow container and the outer layer that are in close contact with each other at the boundary between the exposed inner hollow container and the overmolded outer layer due to a drop impact or the like. Can keep the appearance of the container beautiful.

  Further, it is possible to improve the productivity by preventing the deformation and distortion of the container while absorbing the variation of the manufactured product and conditions.

Explanatory drawing of the multilayer cosmetics container which concerns on this embodiment. Sectional drawing of the multilayer cosmetics container which concerns on this embodiment. Sectional drawing of the multilayer cosmetics container which concerns on the modification of this embodiment. Sectional drawing of the multilayer cosmetics container which concerns on the other modification of this embodiment. Sectional drawing which shows a comparative example.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a multilayer cosmetic container according to the present embodiment, in which (a) shows a multilayer cosmetic container 10, (b) shows an inner hollow container 11, and (c) shows a schematic outer layer 12. FIG. 2 is a cross-sectional view of the multilayer cosmetic container according to the present embodiment, in which (a) is a cross-sectional view of the present embodiment, and (b) and (c) are cross-sectional views of modifications of the present embodiment.

  As shown in FIGS. 1 and 2, the multilayer cosmetic container 10 includes an inner hollow container 11 that contains the cosmetic, and a transparent or translucent outer layer 12 that is in close contact with the inner hollow container 11 and covers the outside. Is done.

  As shown in FIGS. 1 (a) and 2 (a), the multilayer cosmetic container 10 has an integral bottle shape having the body A, the bottom B, the shoulder C, and the neck D. The shoulder C is rounded. Further, the neck is not covered with the outer layer 12, and the neck D of the inner hollow container 11 is exposed to the outside. Next, members constituting the multilayer cosmetic container 10 will be described.

  An internal hollow container 11 shown in FIG. 1B constitutes the interior of the multilayer cosmetic container 10 and accommodates the cosmetic. The inner hollow container 11 is also shaped like a bottle, and is composed of a trunk A1, a bottom B1, a shoulder C1, and a neck D.

  FIG. 1C is a schematic diagram of the outer layer 12. Since the actual outer layer 12 is formed so as to be in close contact with and covered with the inner hollow container 11, the outer layer 12 does not exist alone as shown in FIG. The outer layer 12 is formed by inserting the inner hollow container 11 into a mold (not shown) and then overmolding by injecting molten resin from the outside of the inner hollow container 11.

  As shown in FIG. 2A, the outer layer 12 covers the outside of the body A1, the bottom B1, and the shoulder C1 of the inner hollow container 11. The inner hollow container 11 is specifically made of a synthetic resin and may be transparent, translucent, or opaque. The outer layer 12 is a material that transmits transparent or translucent light, and is specifically made of synthetic resin.

  In the multilayer cosmetic container 10 of FIG. 1 (a), only the neck D of the inner hollow container 11 is not covered with the outer layer 12 except for the base portion with the shoulder C as shown in FIG. It will be exposed. A step is provided in the shoulder, and the outer layer 12 covers up to the step, that is, the entire neck portion D and a part of the shoulder C are not covered by the outer layer 12 and may be exposed. In the drawing, the inner hollow container has a circumferential convex portion, and the outer layer portion is formed so as to cover the convex portion, but the fitting portion irregular shape may be any of the inner hollow container and the outer layer portion. (See FIG. 2 (b)). Further, as shown in FIG. 2C, the inner hollow container may have no step and the neck of the inner hollow container may be exposed. Similarly to FIG. 2A, the fitting portion uneven shape may be uneven in either the inner hollow container or the outer layer portion.

  In the multilayer cosmetic container 10 in which a part or all of the neck D of the inner hollow container 11 or all of the neck C and only a part of the shoulder C are not covered with the outer layer 12 and exposed as described above, When the load of the entire container is applied to the neck D, the shoulder C is deformed by receiving the load, and as a result, as shown in FIG. The inner hollow container 111 and the outer layer 112 that are in close contact with each other are separated from each other at a boundary between a certain part and a non-part, and an air layer is formed there. FIG. 5 is a cross-sectional view showing a comparative example.

  In FIG. 5, the air layer looks like a stain generated between the inner hollow container 111 and the outer layer 112, and liquid such as a cosmetic content from the opening penetrates there. It causes the appearance of the material container to be significantly impaired.

(Structure and manufacturing method for prevention of air layer)
When peeling occurs between the inner hollow container and the outer layer that are in close contact due to an impact such as dropping, the close contact part and the peeling part become an interface, making it look like an unintended spot or water wetting, making the appearance beautiful It will be damaged.

  That is, in order to keep the above-mentioned appearance beautiful, it is necessary to prevent peeling between the closely attached inner hollow container 11 and the outer layer 12.

  For this reason, in the present embodiment, a groove-like shape is formed on the circumference of the neck or shoulder of the internal hollow container covered with the external layer, which is closest to the exposed portion outside the internal hollow container that is not covered with the external layer 12. The engaging concave portion or the rib-like engaging convex portion is formed continuously or intermittently.

  As shown in FIG. 2, when the engaging projection 11a is formed on the neck D of the inner hollow container 11, when the inner hollow container 11 is placed in a mold and overmolded with the outer layer 12, the injected molten resin is engaged. A corresponding engagement recess 12a is formed by covering the joint protrusion 11a. When the inner hollow container 11 and the outer layer 12 are brought into close contact with each other through the unevenness as described above, the adhesion area is increased as compared with a flat state, so that the adhesion strength of the part can be improved.

  In addition, the engaging convex portion 11a and the engaging concave portion 12a may be formed on the shoulder C so that the concave and convex portions are directed in the vertical direction, but it is preferable to form the concave and convex portions so as to be directed in the radial direction of the neck portion. Since the unevenness supports the shoulder C of the inner hollow container 11 moving in the inner direction of the container at the time of dropping from the neck, the superior peeling prevention effect can be obtained. . Moreover, the shape which provided the bending part by combining radial direction and an up-down direction may be sufficient.

  FIG. 3 is a cross-sectional view of a multilayer cosmetic container according to a modification of the present embodiment. As shown in FIG. 3, the inner hollow container 11 side may be the engaging concave portion 11 b and the outer layer 12 side may be the engaging convex portion 12 b. Similarly, a shape in which a bending portion is provided by combining the radial direction and the vertical direction may be used.

  Further, in the above-described embodiment, when the inner hollow container has a recess having an outer diameter of 17φ, the height is 1.3 mm and the horizontal 0.5 mm (with taper) extends over the entire circumference. However, this is not a limitation. Depending on the product diameter and shape, it may be enlarged or provided intermittently, and the cross-sectional shape of the irregularities may be triangular, trapezoidal, semicircular, or the like.

  A configuration having a resin reservoir will be described with reference to FIG. FIG. 4 is a cross-sectional view of a multilayer cosmetic container according to another modification of the present embodiment.

  In the modification shown in FIG. 4A, a resin reservoir for the outer layer 12 is provided in the height direction along the outer wall of the inner hollow container 11 below the neck. A gate is provided at the bottom, and the filling material is filled in the gap between the outer peripheral wall of the inner container and the overmold mold, and the resin reservoir 12g below the neck is formed while forming the bottom, side wall, shoulder, and engaging portion. To reach. In this example, the resin reservoir 12g is provided in the height direction of the neck of the internal hollow container 11.

  Depending on the shape and size of the internal hollow container, as shown in FIG. 4B, the resin reservoir may reach the screw portion, or may be a partial height in the height direction of the neck portion. Furthermore, although not illustrated, the shape may be a shape that extends in the radial direction of the neck after extending in the height direction, or a shape that extends in the radial direction, and the shape is not limited. Further, in the embodiment shown in FIGS. 1 to 3, the resin reservoir is not used, but the resin reservoir can be similarly applied. Further, the position of the gate of the outer layer is also described in detail in the example provided at the bottom, but is not limited to the bottom.

  This resin reservoir absorbs the variation in the material filling amount, and the outer layer 12 and the inner hollow container 11 can be firmly adhered to each other without adversely affecting other portions, thereby improving the productivity.

  Further, the resin reservoir 12g can be formed without being noticeable and uncomfortable in appearance because the outer layer 12 is made of a transparent or translucent resin and the position where it is formed is below the neck. Furthermore, it can be hidden behind screw caps, fixed-dispersion spray nozzles, and dispensers (not shown) that are fitted to close the container opening. Can meet the demands of.

  INDUSTRIAL APPLICABILITY The present invention can be used for a multilayer cosmetic container in which an opaque inner hollow container is covered with a transparent or translucent outer layer.

A, A1 ... trunk B, B1 ... bottom C, C1 ... shoulder D ... neck 10 ... multilayer cosmetic container 11 ... inner hollow container 11a ... engagement convex part 11b ... engagement concave part 12 ... outer layer 12a ... engagement Concave portion 12b ... engaging convex portion 12g ... resin reservoir

Claims (3)

  An inner hollow container made of a synthetic resin having a neck portion that forms an opening, a body portion that is thicker than the diameter of the neck portion, a shoulder portion that connects the body portion and the neck portion, and a hollow interior. In the multi-layer cosmetic container in which the neck and shoulders, or the entire outside of the inner hollow container excluding part or all of the neck, is overmolded by injecting a transparent or translucent molten resin as an outer layer. A groove-like engaging recess or a rib-like engaging convex is continuous on the circumference of the neck or shoulder that is overmolded with the outer layer, which is closest to the outer exposed portion of the inner hollow container without the layer. A multilayer cosmetic container formed intermittently, wherein the engaging concave portion or the engaging convex portion is covered with the outer layer formed by injection molding.   The multilayer cosmetic container according to claim 1, wherein the engagement concave portion or the engagement convex portion is formed at a peripheral edge of a neck portion or a shoulder portion of the internal hollow container. The multilayer cosmetic container according to claim 2, wherein the molten resin that forms the outer layer covering the engagement concave portion or the engagement convex portion installed on the periphery of the neck portion or the shoulder portion of the inner hollow container,
In the injection molding step, a resin reservoir is provided so as to be further filled into the mold after covering the engaging concave portion or the engaging convex portion.

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