JP2009132052A - Double wall cylindrical synthetic resin-made molded product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a double wall cylindrical synthetic resin-made molded product capable of exhibiting decorative characteristics and functions due to a double walls by combining and firmly fixing an outer cylindrical body to the end part of an inner cylindrical body without damaging beautiful appearance. <P>SOLUTION: The double wall cylindrical synthetic resin-made molded product has a double wall cylindrical body formed by the synthetic resin-made outer cylindrical body and the inner cylindrical body inserted and combined to the outer cylindrical body, and a ring body made of a synthetic resin to be bondable to the outer cylindrical body by heat-welding and exhibiting a function as a fitting and engaging part for combining and fixing the ends of the outer cylindrical body and the inner cylindrical body at least at one end part of the upper end part and the lower end part of the double wall cylindrical body. The ring body is integrally provided around end part of the outer cylindrical body by heat welding using an insert molding of the outer cylindrical body and the inner cylindrical body as inserting materials. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a synthetic resin molded product having a double-walled cylindrical shape.

  In the field of products for cosmetics, the decoration method in packaging often gives a sense of quality to differentiate it from other products, but the cap body used for the mouth tube part of the casing container is the purpose of decoration. There is a method of forming a double wall shape and using this double wall to exhibit a decorative effect.

As a means for forming a double-walled molded product such as a cap body such as a cap body, the outer cylinder body and the inner cylinder body are sequentially formed by so-called two-color molding as described in Patent Document 1, for example. There is a method of injection molding, or a method of molding a top cylindrical outer cylinder and an inner cylinder and fitting and assembling two members.
Japanese Patent Laid-Open No. 2000-200522

Here, in the above-described two-color molding, the shapes of the outer cylinder and the inner cylinder are limited, and it is difficult to form a gap between them.
Further, in the method of forming the top cylinder-shaped outer cylinder body and the inner cylinder body and separately fitting and assembling the two members, the fitting locking portion for assembling and fixing the outer cylinder body and the inner cylinder body However, it is not easy to assemble and fix the two members in an undercut shape in order to increase the assembling strength, and there is a problem that the fitting and locking portion impairs the appearance. .

In addition, in a molded product such as a cap-shaped cylindrical cap body, it is possible to make the fitting engagement portion as described above arranged at the lower end of the molded product so that it is less noticeable in appearance.
For example, in a cap-equipped cap body that has a top and is not used for mounting the pump on the mouth tube portion of the container body with a pump, a fitting locking portion is provided on the upper end portion of the cap body, It is necessary to assemble and fix the upper end portion of the body and the inner cylindrical body, and this fitting locking portion is conspicuous in appearance, making it difficult to achieve both aesthetics and assembly strength.

  Then, this invention makes it a subject to fix | assemble and fix the outer cylinder body and the edge part of an inner cylinder body firmly, without impairing the external appearance, and exhibits the decorating property or function which was excellent with the double wall. An object of the present invention is to provide a synthetic resin molded product having a double wall cylindrical shape.

In order to solve the above-mentioned problems of the present invention, the main configuration relating to a synthetic resin molded product having a double-walled cylindrical shape is:
A double-walled cylinder is formed by an outer cylinder made of synthetic resin and an inner cylinder fitted into the outer cylinder.
It is made of a synthetic resin that can be bonded to the outer cylinder by heat welding, and the ends of the outer cylinder and the inner cylinder are assembled and fixed at at least one of the upper end and the lower end of the double-walled cylinder. Having a ring body that functions as a fitting locking part,
The ring body is configured to be integrally provided around the end portion of the outer cylinder body by heat molding by insert molding using the outer cylinder body and the inner cylinder body as an insert material.

The basic technical idea of the double wall cylindrical synthetic resin molded product of the present invention is to form a double wall cylinder by fitting the outer cylinder and the inner cylinder, A ring body is formed by injection molding as an insert material, and the ends of the outer cylinder body and inner cylinder body are firmly assembled by using the bonded portion, the close contact portion, and the undercut-shaped locking portion. It is in the point that a fitting locking part for attaching and fixing is formed.
Here, in order to distinguish the position of the both end surfaces (parts) of an outer cylinder body, an inner cylinder body, and a double wall cylinder in the above-mentioned composition and composition explained below, for convenience, an outer cylinder body, an inner cylinder body, Assuming that the double wall cylinder is in an upright state, both end faces (portions) are distinguished in the vertical direction.
Further, according to the double-walled cylindrical synthetic resin molded product of the present invention, the outer cylindrical body and the inner cylindrical body are assembled and fixed to either one of the upper and lower ends or both ends depending on the application. A ring body that exhibits a function as a fitting locking portion can be attached.

The ring body is made of a synthetic resin that can be bonded to the outer cylinder body by heat welding with the above configuration, and is formed by insert molding using the outer cylinder body and the content body as an insert material. An adhesive part can be easily formed between the end of the outer cylinder by thermal welding, and can be integrally provided around the end of the outer cylinder. Can be touched,
By using the adhesive portion and the close contact portion, the end portions of the outer cylinder body and the inner cylinder body are assembled and fixed, and the function as a fitting locking portion without backlash can be exhibited.

  In addition, although the outer cylinder and the ring are separate members, they are made of synthetic resin that can be bonded by heat welding. It is possible to give the appearance as a single member, and furthermore, by insert molding, the molten resin can flow without gaps along the end portions of the outer cylinder body and the inner cylinder body, and the overall appearance is clean. Can be granted.

  Moreover, it can be set as the structure which forms a gap | interval between an outer cylinder body and an inner cylinder body, and the synthetic resin molded product of the double wall cylinder shape in which the gap | interval was formed can be provided easily.

  Another configuration of the present invention is to form an undercut-shaped engaging portion between the inner cylinder body and the ring body using insert molding in addition to the above basic configuration.

  The ring body is a function that easily regulates the withdrawal of the inner cylinder in an undercut shape by flowing the molten resin along the ends of the outer cylinder and the inner cylinder in the mold by insert molding. A locking part that exhibits the above can be formed, and the action and effect of such a locking part cooperates with the action and effect of the adhesive part and the close contact part described above, and the end parts of the outer cylinder and the inner cylinder are connected to each other. It is possible to more firmly exert the function as a fitting locking portion that is assembled and fixed.

Still another configuration of the present invention is in addition to the above-described configuration,
Align the height position of the upper end surface, the upper end of the inner cylinder is in contact with the outer cylinder, and an inner flange piece that is in contact with the upper end surface of the inner cylinder is provided around the upper end of the outer cylinder. And it is in setting it as the structure which forms a fitting latching | locking part with a ring body using this inner collar periphery piece.

  The above configuration assumes a molded product in which the inner cylinder is fitted from the lower end side of the outer cylinder to form a double wall cylinder, and the upper end thereof is assembled and fixed by the fitting locking portion. By using the inner flange piece provided around the upper end portion of the outer cylindrical body, the fitting locking portion with the upper end portion of the inner cylindrical body can be firmly formed by the ring body.

Still another configuration of the present invention is in addition to the configuration using the inner flange piece,
The ring body includes an inner cylinder end face of the inner cylinder peripheral piece of the outer cylinder body and a fitting cylinder piece that is in outer circumference contact with the inner circumferential surface of the upper end portion of the inner cylinder body, and is provided around the upper end of the fitting cylinder piece so as to form an outer casing shape. The cross-section formed from the outer peripheral peripheral piece that contacts the upper surface of the peripheral piece has an inverted L-shaped peripheral wall,
This ring body is heat-welded to the part from the upper surface of the inner cylinder peripheral piece of the outer cylindrical body to the inner peripheral end face to form an adhesive portion, and the inserted cylindrical piece of the ring body is adhered to the upper end portion of the inner cylindrical body in a close contact manner It is in the structure which forms a fitting latching part in contact.

  The above configuration further specifies the structure of the ring body in the configuration using the inner collar peripheral piece, and the ring body and the outer cylindrical body have a configuration in which the ring body has a peripheral wall having an inverted L-shaped cross section. A strong bonding portion can be formed between the inner flange pieces, and the upper end portion of the inner cylinder body is clamped from three directions by the upper end portion of the outer cylinder body, the inner flange periphery piece, and the fitting cylinder piece of the ring body. The fitting locking portion can be formed more firmly.

  Still another configuration of the present invention forms a rotation locking portion that disables mutual rotation between at least one of the outer cylinder body and the inner cylinder body or between the inner cylinder body and the ring body. It is in the configuration.

  By the above configuration, by forming a rotation locking portion that disables mutual rotation between at least one of the outer cylinder and the inner cylinder or between the inner cylinder and the ring body. Since there is no idle rotation between the outer cylinder and the inner cylinder, the outer cylinder and the inner cylinder can be safely used for applications in which a circumferential force acts on the outer peripheral surface of the double-walled cylindrical molded product.

The rotation locking part can be realized in various configurations, for example, the following configuration.
(1) In the combination of the outer cylinder and the inner cylinder, or the combination of the inner cylinder and the ring body, the cross-sectional shape of both side circumferential surfaces that are in contact with each other at least within a predetermined height range is polygonal, elliptical, long A non-circular shape such as a circle or a star is formed to form a rotation locking portion.
(2) In the combination of the outer cylindrical body and the inner cylindrical body, or the combination of the inner cylindrical body and the ring body, a locking concave portion is formed on one side, and a locking convex portion that fits into the locking concave portion is formed on the other side. A rotation locking portion is formed by the locking recess and the locking projection.
(3) Using the insert molding of the ring body, a rotation locking portion is formed in an undercut shape between the end portion of the inner cylindrical body and the ring body.

  Still another configuration of the present invention is that the outer cylindrical body has transparency. With this configuration, the inner cylindrical body can be seen through the transparent outer cylindrical body, and a three-dimensional decoration effect is exhibited. Can be made.

  Still another configuration of the present invention is to form a gap between the inner cylinder body and the outer cylinder body within a predetermined height range. With this configuration, the outer cylinder body has transparency. In this case, the three-dimensional decoration effect can be more effectively exhibited.

  Still another configuration of the present invention is a cap body that is open in the vertical direction for mounting the pump of the pouring container with a pump on the mouth tube portion of the container book.

The above configuration relates to a specific application of the molded product, and the double-walled cylindrical synthetic resin molded product of the present invention is assembled and fixed to the mouth tube portion of the container body inside the inner cylindrical body. Mounting for attaching to the mouth tube part of the container body with the pump inserted by arranging the screwing part and the presser piece for fixing the pump tightly using the upper end surface of the mouth tube part It can be used as a cap body.
And the cap body by the above configuration is compatible with the strong assembling strength of the outer cylinder body and the inner cylinder body, and the excellent decoration or function by the double wall, in combination with the container body and the overcap, A pumping container with high merchantability can be provided.

The main structure of the present invention according to the double wall cylindrical synthetic resin molded product is as described above, and has the following effects.
In the case of the basic structure, the ring body easily forms an adhesive part with the end of the outer cylinder by heat welding during insert molding, and is integrated around the end of the outer cylinder. The end of the inner cylinder can be closely contacted with the end of the inner cylinder, and the outer cylinder and the end of the inner cylinder can be assembled and fixed using the adhesive and the contact. The function as a fitting locking part without shakiness can be exhibited.

  In addition, although the outer cylinder and the ring are separate members, the outer cylinder and the inner cylinder can be given an appearance as a single member by being integrally connected by heat welding, and further, the outer cylinder and the inner cylinder can be formed by insert molding. The molten resin can be allowed to flow along the end portion without any gap, and a clean appearance can be given as a whole.

  For products that use insert molding to form an undercut-shaped locking part between the inner cylinder and the ring body, functions such as easily controlling the withdrawal of the inner cylinder into an undercut The engaging part can be formed, and the action and effect of such an engaging part cooperate with the action and effect of the adhesive part and the close contact part, and the end parts of the outer cylinder and the inner cylinder are assembled and fixed. The function as a fitting locking part can be exhibited more firmly.

  In the case where an inner flange piece is provided at the upper end of the outer cylinder, the inner hook piece is used to make the fitting engagement with the upper end of the inner cylinder stronger by the ring body. Can be formed.

  In the case where the inner cylinder peripheral piece is provided around the outer cylindrical body and the ring body has a peripheral wall having an inverted L-shaped cross section, the ring body and the inner cylindrical peripheral piece of the outer cylindrical body are strongly fixed. The upper end portion of the inner cylinder is clamped from three directions by the upper end portion of the outer cylinder, the inner peripheral piece, and the inserted cylinder piece of the ring body, thereby further strengthening the fitting locking portion. Can be formed.

  In the case where the rotation locking portion is formed, since there is no idle rotation between the outer cylinder and the inner cylinder, it is also safe for applications in which a circumferential force acts on the outer peripheral surface of the double-walled cylindrical molded product. Can be used with heart.

  When the outer cylinder has transparency, the inner cylinder can be seen through the outer cylinder having transparency, and a three-dimensional decoration effect can be exhibited.

  In the case where a gap is formed between the inner cylinder and the outer cylinder, the three-dimensional decoration effect can be more effectively exhibited by assuming that the outer cylinder has transparency.

  In the case where the molded product is a cap body for mounting the pump of the dispensing container with a pump on the mouth tube portion of the container book, the strength of the strong assembly of the outer cylinder body and the inner cylinder body and the double wall It is possible to provide a pouring container with a pump having high merchantability in combination with a container body and an overcap.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below along the examples with reference to the drawings.
1 to 5 show a cap body 1 which is one embodiment of a double-walled cylindrical synthetic resin molded product of the present invention, FIG. 1 is a longitudinal side view, and FIG. 2 is a portion surrounded by a circle in FIG. FIG. 3 is a plan sectional view taken along line AA in FIG. 1, and FIG. 4 is a double view in which the inner cylinder 2 is fitted into the outer cylinder 12. FIG. 5 is a longitudinal sectional side view showing the wall cylinder 10, and FIG. 5 is a (a) longitudinal side view showing the ring body 21 in FIG. 1 and (b) a bottom view.

  This cap body 1 is used for mounting a pump of a dispensing container with a pump on a mouth tube portion of a container body. In FIG. 1, a pump 37 is used by using a packing 37 on a mouth tube portion 32 of a container body 31. 33 shows a state in which 33 is closely assembled and fixed, and further an overcap 39 is provided. (In FIG. 1, the container main body 31, the pump 33, the overcap 39 and the like are indicated by two-dot chain lines.)

Further, the cap body 1 has an outer cylinder body 12 and an inner cylinder body 2 each having a regular dodecagonal cylindrical shape as shown in FIG. 3, and an outer peripheral end of a regular 12 shape as shown in FIG. 5B. It consists of three members of the ring-shaped ring body 21 which is a square.
The inner cylinder 2 is made of milky white polypropylene (PP) resin, and the outer cylinder 12 and the ring body 21 are made of AS resin and are transparent.

The outer cylindrical body 12 has a peripheral wall 14 having a regular dodecagonal cross-sectional shape that is gradually reduced in diameter from the lower end portion to the upper end portion, and an inner collar peripheral piece 15 is provided around the upper end of the peripheral wall 14. Further, a step portion with which the overcap 39 abuts is provided on the outer peripheral surface of the upper end portion.
This overcap 39 is also made of an AS resin transparent to match the outer cylinder 12 and has a regular dodecagonal flat cross-sectional shape so that it has a uniform appearance from the outer cylinder 12 to the overcap 39. ing.

The inner cylindrical body 2 has a peripheral wall 4 having a regular dodecagonal flat cross-sectional shape that is gradually reduced in diameter from the lower end portion to the upper end portion so as to be inscribed in the peripheral wall 14 of the outer cylindrical body 12. The outer cylindrical body 12 is fitted from the lower end side, and the upper end surface of the peripheral wall 4 is in a fitted state in contact with the inner flange peripheral piece 15 of the outer cylindrical body 12.
Further, in this fitted state, the height positions of the upper end surfaces of the outer cylindrical body 12 and the inner cylindrical body 2 coincide with each other, the inner peripheral end surface of the inner collar peripheral piece 15, and the inner peripheral edge of the upper end portion of the peripheral wall 4 of the inner cylindrical body 2. The surfaces are aligned on the same circumferential surface.
A peripheral step 4a is provided around the inner peripheral surface and upper end of the peripheral wall 4, and a locking recess 9 that engages with a ring body 21 described later is formed in the peripheral step 4a.

In addition, a cylindrical threaded cylinder 8 for hanging from the upper end of the inner peripheral surface of the peripheral wall 4 of the inner cylindrical body 2 to the mouth cylindrical part 32 of the container main body 31 is suspended.
A guide cylinder 7 for the stem 33 s of the pump 33 is disposed from the center height position of the screwing cylinder 8 through the inner flange piece 6.
Then, the inner cylinder piece 6 seals the flange 35 of the pump 33 to the upper end surface of the mouth tube portion 32 via the packing 37 by screwing and assembling the screw tube 8 to the mouth tube portion 32 of the container body 31. The pump 33 is assembled and fixed to the mouth tube portion 32.

  The ring body 21 includes a peripheral wall 22 having an inverted L-shaped cross section formed from a short cylindrical insertion cylinder piece 22a and an outer casing peripheral piece 22b provided in an outer casing shape from the upper end of the insertion cylinder piece 22a. Further, on the outer peripheral surface of the fitting cylinder piece 22a, the locking protrusions 23 that form the locking recesses 9 and the locking portions of the inner cylinder 2 described above are projected at four locations. (See FIGS. 5A and 5B)

Next, a method for forming the cap body 1 composed of the three members of the outer cylinder body 12, the inner cylinder body 2 and the ring body 21 will be described.
The cap body 1 is manufactured by forming a ring body 21 by an insert injection molding method using a double wall cylinder body 10 (see FIG. 4) in which an inner cylinder body 2 is fitted and assembled to an outer cylinder body 12 as an insert material. Can do. (Of course, the double wall cylinder 10 mold in which the outer cylinder 12 and the inner cylinder 2 are fitted in advance in consideration of the productivity of the entire production process including the molding process of the outer cylinder 12 and the inner cylinder 2. (It is also possible to select a method of fitting the outer cylinder 12 and the inner cylinder 2 into the double-walled cylinder 10 in the mold.)
The molding procedure is roughly described in the following (1) to (3).
(1) The inner cylinder 2 made of PP resin is fitted into the outer cylinder 12 made of AS resin to form a double-walled cylinder 10. At this time, the upper end surface of the peripheral wall 4 of the inner cylindrical body 2 abuts on the inner flange peripheral piece 15 of the outer cylindrical body 12, and its insertion limit is determined.
(2) The double wall cylinder 10 is set as an insert material in an injection mold.
(3) In a mold by injection molding, molten SS resin is flowed and filled in the portion from the upper surface of the inner collar peripheral piece 15 of the outer cylindrical body 12 to the inner peripheral end surface and the peripheral step portion 4a of the inner cylindrical body 2. Thus, the ring body 21 is formed.

In the molding method of the above procedure, in the molding of the ring body 21, the molten resin is supplied from the pin gate PG disposed at a position corresponding to the upper surface of the outer flange peripheral piece 22b as shown in FIG. Since it flows around the entire circumference of the mold cavity that forms the body 21 and is filled with pressure, the adhesive portion S () is attached to the ring body 21 and the portion of the inner cylinder peripheral piece 15 of the outer cylinder 12 from the upper surface to the inner peripheral end surface. 2 is formed, and the lower end portion of the fitting cylinder piece 22a of the ring body 21 is in close contact with the circumferential step portion 4a of the inner cylinder body 2, and the upper end portion of the inner cylinder body 2 is The upper end portion of the peripheral wall 14 of the outer cylindrical body 12, the inner flange peripheral piece 15, and the insertion cylindrical piece 22 a of the ring body 21 are firmly held from three directions. (See Figure 2)
Here, in this embodiment, the ring body 21 is injection molded by using the pin gate PG as described above. Of course, the shape of the ring body 21 takes into consideration the fluidity and filling properties of the molten resin at the time of molding. Thus, a gate having another shape can be selected.

  In addition, the AS resin in a molten state at the time of insert molding of the ring body 21 flows into and fills the locking recess 9 formed in the peripheral step portion 4a of the inner cylindrical body 2 to form the locking protrusions 23. A locking portion B that functions to prevent the inner cylinder 2 from coming out is formed in an undercut shape by the locking recess 9 and the locking protrusion 23, and is fitted by the adhesive portion S, the close contact portion, and the locking portion B. A mating locking portion F is formed, and the upper end portions of the outer cylindrical body 12 and the inner cylindrical body 2 are firmly fixed and assembled together without rattling.

  Further, the locking portion B also functions as a rotation locking portion K that prevents the outer cylinder 12 and the inner cylinder 2 from spinning freely. However, in the cap body 1 of the present embodiment, the outer cylinder 12 and the inner cylinder. The planar cross-sectional shape of both side peripheral surfaces of the body 2 that are in contact with each other is a regular dodecagon (see FIG. 3), and the function as the rotation locking portion K is also exhibited in this peripheral contact portion.

  Here, in this embodiment, the undercut-shaped locking part B and the rotation locking part K are provided, but these locking parts are used for the double-walled cylindrical synthetic resin molded product of the present invention. Therefore, one or both of them can be omitted in consideration of the action of force during use. That is, in an application in which there is no concern about the withdrawal of the inner cylindrical body 2 or the idle rotation of the outer cylindrical body 12 and the inner cylindrical body 2, the bonding portion S between the ring body 21 and the upper end portion of the outer cylindrical body 12, The fitting locking portion F can be formed by a close contact portion with the upper end portion of the inner cylindrical body 2.

Next, the external appearance of the cap body 1 of this embodiment and the surface of the decorating property will be described. Since the ring body 21 that functions as the fitting locking portion F is formed by insert molding, the ring body 21 is fitted to the outer cylindrical body 12 without causing a step by heat welding, and smoothly integrated without impairing the appearance. Can be arranged in a line.
Further, since it is possible to hide the seam in the bonding portion B even if it is transparent, the ring body 21 as the third member is recognized as the same member as the outer cylindrical body 12 when viewed from the outside, and the entire body is neat. Appearance can be.

Further, in the case of the present embodiment, a visual effect that the milky white inner cylinder 1 floats in the transparent outer cylinder 12 is exhibited, and the outer cylinder 12 and the inner cylinder 2 are connected to a regular dodecagonal cylinder. By adopting the shape, a crystal-like optical visual effect can be exhibited by the incidence and reflection direction of light.
Furthermore, in the double-walled cylindrical synthetic resin molded product of the present invention, for example, a double wall is provided around the upper end portion and the lower end portion, and between the outer cylinder body 12 and the inner cylinder body 2 within a predetermined height range. In this way, it is possible to easily realize a configuration in which a gap is formed, and the optical visual effect can be effectively exhibited by such a gap between the double walls.

In addition, according to in-mold molding, the fitting locking portion F by the ring body 21 which is the third member is formed in various modes by combining the shapes of the end portions of the outer cylinder body 12 and the inner cylinder body 2. be able to.
6 (a) and 6 (b) are main part enlarged longitudinal sectional views showing other examples of the fitting locking part F, respectively.
In the example of FIG. 6A, the inner flange 15 is not provided around the upper end of the outer cylinder 12 as in the embodiment of FIG. 1, but the upper end surface of the peripheral wall 14 of the outer cylinder 12 and the inner cylinder The ring body 21 is insert-molded with the upper end surface of the peripheral wall 4 of the body 2 aligned at the same height. In this case, the upper end surface of the peripheral wall 14 of the outer cylindrical body 12 and the ring body 21 are bonded. Part S is formed. Further, in this example, the shape of the locking concave portion 9 constituting the locking portion B is tapered, so that the mold opening mechanism in the injection molding of the inner cylinder 2 can be made relatively simple. it can.

In the example of FIG. 6B, the ring body 21 is insert-molded with the upper end surface of the peripheral wall 4 of the inner cylindrical body 2 slightly protruding from the upper end surface of the peripheral wall 14 of the outer cylindrical body 12.
Further, in this example, the locking recess 9 constituting the locking portion B is formed on the outer peripheral surface side of the peripheral wall 4 of the inner cylindrical body 2, and in this case also, the mold opening mechanism in the injection molding of the inner cylindrical body 2 Can be made relatively simple.

As mentioned above, although embodiment about the double-walled cylindrical synthetic resin molded product of this invention was described along the Example, embodiment of this invention is not limited to the said Example.
For example, in the above embodiment, the molded product is a cap body for mounting a pump. However, the present invention is generally applicable to a synthetic resin molded product having a double wall cylindrical shape in addition to such a cap body. Depending on the application, the upper end, lower end, or both of the molded product can be assembled and fixed with a ring body by insert molding.

  Further, by decorating the outer surface of the inner cylinder 2 by painting or metal vapor deposition, a more advanced optical visual effect can be exhibited through the transparent outer cylinder 12. Moreover, not only such a decorating property but various functions can be exhibited using a double wall.

  Further, as described above, according to the in-mold molding method, the formation mode of the engagement locking portion F by the ring body 21 which is the third member has a great degree of freedom, and in addition to the example shown in FIG. Further, various configurations can be adopted.

  As described above, the double-walled cylindrical synthetic resin molded product of the present invention is capable of firmly assembling and fixing the outer cylinder and the end of the inner cylinder without deteriorating the appearance. Wide application in the field of cosmetic containers is expected by taking advantage of the aesthetics and function of the double wall.

It is a vertical side view which shows the cap body of one Example of the molded article of this invention. FIG. 2 is an enlarged vertical cross-sectional view of a main part showing an enlarged vicinity of a fitting locking part in FIG. 1. It is a plane sectional view shown along the AA line of FIG. It is a vertical side view which shows the double wall cylinder which inserted and assembled the inner cylinder body in the outer cylinder body in FIG. It is (a) vertical side view which shows the ring body of the molded article of FIG. 1, and (b) bottom view. (A), (b) is the principal part expansion longitudinal cross-sectional view which shows the example of the other formation aspect of a fitting latching part, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1; Cap body 2; Inner cylinder 4; Peripheral wall 4a; Circumferential step part 6; Inner collar piece 7; Guide cylinder 8; Screwing cylinder 9; Locking recessed part 10; Double wall cylinder 12; Peripheral wall 15; inner collar peripheral piece 21; ring body 22; peripheral wall 22a; fitting cylinder piece 22b; outer collar peripheral piece 23; locking protrusion 31; container body 32; 35; flange 37; packing 39; overcap S; adhesive portion B; locking portion F; fitting locking portion K; rotation locking portion PG;

Claims (8)

A double wall cylindrical body (10) is formed by an outer cylindrical body (12) made of synthetic resin and an inner cylindrical body (2) fitted into the outer cylindrical body (12), and the outer cylindrical body (12). It is made of a synthetic resin that can be bonded by heat welding to the outer cylindrical body (12) and the inner cylindrical body (2) at at least one of the upper end portion and the lower end portion of the double wall cylindrical body (10). It has a ring body (21) that functions as a fitting locking part (F) for fixing the ends together, and the ring body (21) includes the outer cylindrical body (12) and the inner cylindrical body ( A double-walled cylindrical synthetic resin molded product having a structure in which the outer periphery (12) is integrally welded to the end of the outer cylinder (12) by insert molding using 2) as an insert material. The double-walled cylindrical synthetic resin according to claim 1, wherein an undercut-shaped locking portion (B) is formed between the inner cylindrical body (2) and the ring body (21) using insert molding. Molded product. Align the height position of the upper end surface, the upper end portion of the inner cylinder (2) is in contact with the outer cylinder (12), the inner cylinder (2) in the form of an inner flange at the upper end of the outer cylinder (12) An inner flange piece (15) that abuts the upper end surface of the inner ring is provided, and the engagement lock portion (F) is formed by the ring body (21) using the inner flange piece (15). The double-walled cylindrical synthetic resin molded product according to claim 1 or 2. The ring body (21) includes an insertion cylinder piece (22a) that is in outer contact with the inner peripheral end face of the inner flange piece (15) of the outer cylinder body (12) and the inner peripheral face of the upper end portion of the inner cylinder body (2), and the fitting A peripheral wall (22) having an inverted L-shaped cross section formed from an outer flange peripheral piece (22b) that is provided around the upper end of the cylindrical flange piece (22a) and is in contact with the upper surface of the inner flange peripheral piece (15). ), And the ring body (21) is thermally welded to a portion extending from the upper surface of the inner flange peripheral piece (15) of the outer cylindrical body (12) to the inner peripheral end surface to form an adhesive portion (S), The fitting cylinder part (22a) of the ring body (21) is configured to form a fitting locking part (F) by tightly contacting the upper end part of the inner cylinder body (2) in close contact with the outer periphery. Heavy-wall cylindrical synthetic resin molded product. A rotation locking portion that disables mutual rotation between the outer cylinder (12) and the inner cylinder (2) or between at least one of the inner cylinder (2) and the ring body (21). The double-walled cylindrical synthetic resin molded product according to claim 1, 2, 3 or 4, wherein (K) is formed. The double-walled cylindrical synthetic resin molded article according to claim 1, 2, 3, 4 or 5, wherein the outer cylinder (12) is transparent. The double wall cylindrical shape according to claim 1, 2, 3, 4, 5 or 6, wherein a gap is formed between the inner cylindrical body (2) and the outer cylindrical body (12) within a predetermined height range. Synthetic resin molded product. The double according to claim 1, 2, 3, 4, 5, 6 or 7, which is used as a cap body opened in both the upper and lower directions for mounting the pump of the dispensing container with a pump on the mouth tube portion of the container body. Wall cylindrical synthetic resin molded product.

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