JP2003189932A - Container for mascara, and method for molding the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blow-molded container for mascara having a hanging part for preventing removal of an inner cap on a lower surface of a shoulder wall along an inner peripheral lower end of a cylindrical part. <P>SOLUTION: This container for mascara comprises a container main body, and a cap provided with a scraping inner cap and a brush body. The container main body comprises the cylindrical mouth part, the shoulder wall, a circumferential drum wall, and a bottom wall, and it is molded by blow-molding. A circular recessed groove is provided in an outer circumference at a lower end part of the cylindrical part, and the hanging part is formed in the lower surface of the shoulder wall to be swollen downward along an inner peripheral lower end of the cylindrical mouth part. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mascara container, and more particularly to a mascara container obtained by molding a container body by blow molding and a molding method thereof.

[0002]

The conventional mascara container has the following problems.
Although it is formed by injection molding, there is a problem that the structure of the container is complicated because the ironing inner plug (wiper member) having elasticity is attached to the container body using the attaching means. In order to facilitate the attachment of the ironing inner plug, the container body may be molded by blow molding, and a hanging portion for preventing the inner plug from coming off may be formed on the shoulder wall along the lower end of the inner peripheral surface of the container mouth cylinder. Proposed.

As shown in FIG. 5, the drooping part is formed by blowing a blow pin Ga on a parison p held by a blow molding die Fa.
And the outer peripheral surface a of the blowing pin Ga reduces the thickness of the parison p in the portion corresponding to the container mouth cylinder portion b, and pushes the reduced thickness c downward to extend the inner circumference of the mouth cylinder portion b. It is shaped so as to form a drooping part d having a thick lower wall of the shoulder wall along the lower end.

However, in order to extend the inner peripheral surface of the parison p to form the hanging portion d, the container mouth cylinder portion b
Since it is necessary to use the parison p which is considerably thicker than the thickness of No. 1, there is a problem that the overall thickness of the container cannot be made thin. Further, the molding conditions for the parison p are not always constant, and the wall thickness may change or uneven thickness may occur due to drawdown of the parison or the like.

Therefore, when the blow-in pin Ga is driven, there is a problem in that the shape and size of the drooping part d are not constant because the amount of extension of the parison p and the amount of resin forming the drooping part d change. . In particular, when the amount of stretching is large, the variation is due to the shape of the drooping part d,
There is a problem that the size is greatly affected and the variation becomes large. Further, the change in the wall thickness of the parison p affects the wall thickness of the container mouth cylinder portion b and the wall thickness of the body peripheral wall, and there is a problem that the dimensions are not stable.

In order to solve the above problems, the present invention is a blow molding for mascara in which a hanging portion is formed on the lower surface of the shoulder wall along the inner peripheral lower end of the mouth tube portion to prevent the inner plug from coming off. An object is to provide a container and a molding method thereof.

[0007]

In order to solve the above-mentioned problems, the present invention provides a mascara container comprising a container body, a container body, an ironing cap, and a cap to which a brush body is attached. Consists of a mouth tube and a shoulder wall, a body wall and a bottom wall, and is formed by blow molding.An annular groove is formed on the outer circumference of the lower end of the mouth tube, and the lower surface of the shoulder wall is inside the mouth tube. A configuration is adopted in which a drooping portion that bulges downward along the lower edge of the circumference is formed.

As an embodiment of the inner plug, the ironing inner plug is formed of an elastic body, and has an annular wiper on the inner periphery thereof, which is provided with a cylindrical body provided with a flange projecting from the top surface of the container mouth cylindrical portion. Is provided, and a locking ring that engages with the hanging portion of the container shoulder wall is provided on the outer circumference.

As a method for molding a mascara container, a parison is held by using a blow molding die having a protruding surface forming a groove on the outer periphery of the lower end of the container mouth, and the inside of the parison is expanded by the protruding surface. Form the constricted part as the projecting part, drive the blowing pin into the parison, shape the inner peripheral surface of the mouth cylinder part with the outer peripheral surface of the nozzle, push the extruded bulged part downward and expand it to the lower surface of the shoulder wall. The structure is characterized in that a drooping portion for preventing the plug from coming off is formed.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. First, the outline of the mascara container of the present invention will be described. In FIG.
A is a container body, B is an ironing plug, C is a cap, D is a brush holder, and E is a brush.

As shown in FIGS. 1 and 2, the container body A is composed of a mouth tube portion 1, a shoulder wall 2, a body peripheral wall 3 and a bottom wall 4,
It is blow molded using a resin such as PET or PE.
A screw 5 is screwed on the outer periphery of the mouth tube portion 1, and a groove 6 is formed below the screw 5 and continues to the shoulder wall 2. Mouth tube part 1
An annular hanging portion 7 is provided at the lower end of the inner circumference of the so as to bulge downward from the inner surface of the shoulder wall 2 along the inner circumference surface. The body peripheral wall 3 has a circular cross section, and a reduced diameter portion 8 following the shoulder wall 2 is formed on the upper portion thereof, and a lower end thereof forms a step portion 9.

The ironing plug B is a tubular body 11 having a flange 10 mounted on the top surface of the container mouth tubular portion 1 in a protruding manner at the upper end thereof, and is made of synthetic resin of rubber, elastomer or soft material. A conical wiper 12 protruding downward is provided at a predetermined position on the inner circumference of the cylindrical body 11 in order to squeeze the excess liquid by squeezing the brush E, and the hanging portion 7 is provided on the outer circumference. A locking ring 13 that engages is provided in a protruding manner. When the ironing inner plug B is fitted into the container mouth cylinder part 1, since it is a soft material,
When it is pushed in from above and fitted, and the stopper is removed, the locking ring 13 engages with the hanging portion 7 so that it cannot be easily pulled out.

As shown in FIG. 1, the cap C includes a top wall 2
0 and the side peripheral wall 21, the inner periphery of the side peripheral wall 21 is a fitting portion 22 of the brush holder D, and a screw 23 that is screwed into the screw 5 of the mouth tube portion 1 is provided at the lower end portion. It is screwed, and the lower portion thereof is enlarged in diameter to form an enlarged diameter portion 24 which is fitted into the reduced diameter portion 8 of the body peripheral wall 3.

The brush holder D comprises a fitting cylinder 30 fitted in a cap C and a brush holding shaft 31, and a brush E is held at the lower end of the brush holding shaft 31.

When using the mascara container, the cap C is unscrewed and the brush holder D is pulled up.
The mascara liquid applied to the brush E is wiped off by the soft wiper 12, so that a constant amount of the mascara liquid is always applied to the brush E.
Attached to. At that time, the locking ring 13 on the outer periphery of the ironing inside plug B
Engages with the hanging part 7 of the container mouth cylinder part 1 and is prevented from rising and does not come off.

Next, an outline of a mold used for blow molding will be described with reference to FIG. In FIG. 3, F is a blow molding die, which is composed of a pair of split dies 40a and 40b.
1 is formed. At the top of the mold cavity 41,
A mouth tube forming portion 42 and a shoulder wall forming portion 43 of the container are provided,
A pinch-off portion that forms the waist peripheral wall forming portion 44 and the bottom wall is provided below. The mouth tube forming portion 42 includes a thread forming portion 45 and an annular protruding surface 46 that protrudes inward to form the groove 6.

The blow pin G comprises a cylindrical mandrel 48 having a blow hole 47 formed therein and a nozzle 49.

Next, a method of molding the container body A will be described. As is well known, first, the molten parison P extruded from the extruder is sandwiched by the blow molding dies F, and then the upper and lower parts of the parison P are cut to perform mold clamping. Next, as shown in FIGS. 3 and 4, the blow-molding die F that has been clamped is sent to the lower side of the blowing device, and the blowing pin G is blown.
Is struck on the upper end of the parison P and compressed air is press-fitted to mold the container body A.

When the parison P is clamped, the projecting surface 46 of the mouth tube forming portion 42 of the blow molding die F bites into the surface of the parison P, and the parison P has a constricted portion P inwardly bulging.
It forms a and acts to prevent the parison P from sinking.

When the blow-in pin G is driven in, compressed air is pressed in at the same time as the drive-in, but the peripheral surface of the nozzle 49 forms the inner peripheral surface of the container mouth cylinder 1 and the inner bulge of the constricted portion Pa of the parison P is formed. The portion Pb is pushed downward to form the hanging portion 7 on the lower surface of the shoulder wall 2. At this time, the amount of resin forming the drooping portion 7 is a resin amount substantially equivalent to the portion of the constricted portion Pa that bulges from the inner peripheral surface of the container mouth cylinder portion 1, that is, the inner bulging portion Pb, Even if the molding conditions are unbalanced, the amount of the inner bulging portion Pb is small, so that the fluctuation is small, and the projecting surface 46 forms the inner bulging portion Pb that is uniform in the circumferential direction. The shape and the hanging dimension of the portion 7 are constant, and the imbalance is small.

[0021]

Since the present invention is constructed as described above, it has the following effects. The resin of the parison that is pressed down by the peripheral surface of the blow-in pin is almost not the resin in the upper part of the mouth tube part, but only the resin of the annular bulging part on the lower surface of the mouth tube part, so it is pressed down evenly in the circumferential direction, and the drooping part The shape and the drooping dimension can be made constant.

Further, since the hanging portion is formed by pushing down the bulging portion on the peripheral surface of the nozzle, the thickness of the parison can be reduced, and the container can be thin as a whole.

[Brief description of drawings]

FIG. 1 is a partially sectional front view of a mascara container of the present invention.

FIG. 2 is an enlarged cross-sectional view of a container mouth cylinder part.

FIG. 3 is a cross-sectional view of a blow molding die holding a parison.

FIG. 4 is an explanatory view when driving a blowing pin.

FIG. 5 is an explanatory view when molding a conventional container body.

[Explanation of symbols]

A container body B ironing plug C cap D brush holder E brush F, Fa blow molding dies G, Ga blow pin P, p parison Pa constriction Pb Inner bulge a outer peripheral surface b Mouth tube c Thickness d hanging part 1 mouth tube 2 shoulder wall 3 waist wall 4 bottom wall 5 screws 6 groove 7 hanging part 10 flange 11 cylinder 12 wiper 13 Lock ring 30 fitting cylinder 31 Brush holding tube 40a, b split type 41 mold cavity 42 Mouth tube part forming part 43 Shoulder wall forming part 44 Body wall forming part 45 Thread forming part 46 Projection surface 47 blow hole 48 mandrels 49 nozzles

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takatoshi Saito             Stock exchange, 3-2-6 Oshima, Koto-ku, Tokyo             Inside the company Yoshino Industry (72) Inventor Takao Sato             28 Yoshida, Ogawa-machi, Nasu-gun, Tochigi Prefecture Yoshino Co., Ltd.             Factory Nasu Ogawa Factory F-term (reference) 4F202 AG07 AG23 AG26 AG27 AH55                       CA15 CB01 CK11                 4F208 AG07 AG23 AG26 AG27 AH55                       LA02 LB01 LG03 LG28 LN06                       LN07

Claims (3)

[Claims] 1. A mascara container comprising a container body, an ironing cap, and a cap to which a brush body is attached, wherein the container body comprises a mouth tube portion, a shoulder wall, a body peripheral wall and a bottom wall,
It is formed by blow molding, and an annular groove is engraved on the outer periphery of the lower end of the mouth cylinder, and a drooping part that bulges downward along the lower end of the inner periphery of the mouth cylinder is formed on the lower surface of the shoulder wall. Characteristic mascara container. 2. An ironing plug is formed by an elastic body, and an annular wiper is provided on the inner periphery of the inner periphery of the outer periphery of which a cylindrical body is provided which is provided with a flange at the upper end and which is mounted on the top surface of the container mouth cylindrical portion. The mascara container according to claim 1, further comprising a locking ring that engages with a hanging portion of the container shoulder wall. 3. A parison is sandwiched by using a blow molding die in which a projecting surface forming a groove is formed on the outer periphery of the lower end portion of the container mouth cylinder, and the projecting surface has a constriction whose inner side is a bulge. Forming a part, driving a blow pin into the parison, and molding the inner peripheral surface of the mouth cylinder part with the outer peripheral surface of the nozzle, while pushing the extruded bulged part downward to prevent the inner plug from coming out on the lower surface of the shoulder wall. A blow molding method for a mascara container, characterized in that a hanging portion is formed.