JP2006082864A - Bottle container made of resin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bottle container made of a resin which has a comparably thick wall and gives a posh image visually and has a constant volume so that the upper surface position is always constant when a constant volume of content is filled in the container. <P>SOLUTION: The resin-made bottle container 1 made of a polyester resin is formed by unifying an inner part 2 and an outer part 3 and a ring ditch 6 is provided on the periphery of the inner part 2 so as to connect continuously to a step part 5 formed below a male screw 4 and a circular projected edge 7 is provided on the upper end edge of the outer part 3 and the circular projected edge 7 is inserted in the ring ditch 6 to be engaged closely. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a polyester resin bottle container in which an inner part and an outer part are integrated. For example, the present invention relates to a resin bottle container suitable for housing various cosmetics such as cosmetic creams.

  Conventionally, a bottle container for cosmetics needs to have a high-class feeling in order to enhance a product image, and thus a thick container is used. Production of a general plastic bottle container is often performed by blow molding, but in this blow molding, a thickness of only about 5 mm can be obtained. For example, this is molded to a thickness of about 10 mm. Was difficult. Further, in this blow molding, it has been difficult to mold a container having a partially thickened wall.

  On the other hand, the inner and outer double containers are formed by insert molding to obtain a polyester resin container having a thickness exceeding 5 mm. In this case, the joint surface is caused by shrinkage during the molding of the polyester resin. For example, the joining surface of the outer upper end portion joined at the stepped portion is easily separated, and when it is in the separated state, it is visually recognized as a crack, and it is handled as a defective product. The effect of shrinkage at the time of molding also appears in the case of other resins, but is particularly remarkable in the case of polyester resins.

For this reason, glass bottles are generally used for cosmetic bottles that are relatively thick and visually give a high-class feel.
JP-A-9-215521

  However, the glass bottle containers are likely to have irregularities and distortions on the inner surface of the container at the time of molding, and it is difficult to make each bottle container have the same volume. In such cosmetic bottle containers having different volumes, even if each container is filled with the same amount of cosmetic using the filling device, the upper surface position is not constant and the container can be seen through. If it exists, the accommodation amount of a container with a low upper surface position will appear smaller than the accommodation amount of another container. For this reason, conventionally, the bottle container is manually replenished with cosmetics until the upper surface position in the bottle container reaches a certain position. However, the manual replenishment of the cosmetics is troublesome and, when the cosmetics are expensive, there is a problem that it is uneconomical due to extra material costs.

  The present invention provides a polyester having a relatively thick wall thickness of about 10 mm, visually giving a high-class feeling, a constant volume, and a constant top surface position when a certain amount of contents are filled in a container. An object is to provide a plastic bottle container.

  In order to achieve the above object, a resin bottle container according to claim 1 of the present invention is a polyester resin bottle container, which is formed by integrating an inner part and an outer part on the outer peripheral surface of the inner part. Is provided with an annular groove, and the upper edge of the outer part is inserted into the annular groove.

  Similarly, in order to achieve the above object, in the resin bottle container according to claim 2 of the present invention, in the configuration of claim 1, the annular groove of the inner part is formed by the male thread portion provided on the outer peripheral surface of the inner part. On the other hand, an annular projecting edge that projects into the annular groove is provided at the upper end edge of the outer part while being provided so as to be continuous with the step portion formed below.

  According to the resin bottle container of the present invention, the upper end edge of the outer part enters into the annular groove of the inner part and closely engages therewith, so there is no distortion due to shrinkage at the time of molding. It is possible to avoid the situation where the surface is visible as if a crack has occurred due to the separation of the joint surface with the outer part, and there is no variation in volume as in conventional glass bottle containers, and coloring is also easy. The effect that it is.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. Here, FIG. 1 is a partial longitudinal sectional view of a resin bottle container, and FIG. 2 is a partially enlarged view thereof.

  As shown in FIG. 1, a bottle container 1 made of polyester resin includes an inner part 2 and an outer part 3 integrated with a lower part of the inner part 2. Although not clear in the figure, the planar shape of the parts 2 and 3 is circular. Further, on the outer peripheral surface of the upper part of the inner part 2, a male screw that is screwed with the female screw part in order to close the open upper surface of the bottle container 1 with a lid (not shown) having a female screw part on the inner peripheral surface. Part 4 is provided.

  As shown in FIGS. 1 and 2, a step portion 5 is formed below the male screw portion 4 on the outer peripheral surface of the inner part 2, and an annular groove 6 is formed so as to be continuous with the step portion 5. Then, an annular projecting edge 7 provided inside the upper end edge of the outer part 3 is inserted into the annular groove 6, and both 6 and 7 are closely engaged. The annular groove 6 is difficult to identify with the naked eye after being integrated.

  In the bottle container 1 configured in this manner, the annular protruding edge 7 of the outer part 3 is closely fitted in the annular groove 6 continuing to the stepped portion 5 of the inner part 2, so that the annular protruding edge 7 is viewed from above and below. It is in a pinched state, preventing distortion due to shrinkage when molding the polyester resin, improving adhesion, eliminating separation at the joint surface between the inner part 2 and the outer part 3 and ensuring that both parts 2 and 3 are securely Integrate.

  In addition, manufacture of the bottle container 1 can be performed using a well-known insert molding machine, and the polyester resin bottle container 1 whose thickness exceeds 5 mm and is about 10 mm is easily obtained.

  Moreover, this invention is not limited to the above-mentioned embodiment, For example, the shape of the bottle container 1 is not restricted to what is shown in figure, The polygonal shape may be sufficient as the planar outline shape of the outer part 3. FIG. Furthermore, when the lid that closes the open upper surface of the inner part 2 is not configured to be screwed with the threaded portion, the male threaded portion 4 of the inner part 2 is not necessary, and the planar shape of the inner part 2 is compatible with the lid. It can also be formed into a polygonal shape.

The fragmentary longitudinal cross-section of a resin bottle container. The elements on larger scale of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bottle container 2 Inner part 3 Outer part 4 Male thread part 5 Step part 6 Annular groove 7 Annular rim

Claims (2)

A bottle container made of polyester resin, in which an inner part and an outer part are integrated, an annular groove is provided on the outer peripheral surface of the inner part, and an upper end edge of the outer part is inserted into the annular groove. A plastic bottle container. The annular groove of the inner part is provided so as to be continuous with the step formed under the external thread part provided on the outer peripheral surface of the inner part, while an annular protruding edge that enters the annular groove is provided at the upper edge of the outer part. The resin bottle container according to claim 1, wherein

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