JP2004276974A - Dispenser container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dispenser container of which the structure does cause troubles due to powder or silicon oil involved in a content in the container, and in addition, for which such a structure can be adopted without requiring a design change of an already existing dispenser container, and without making the structure more complicated. <P>SOLUTION: This dispenser container can discharge the content by a pump mechanism which is fitted in the mouth part of the container and comprises a piston and a cylinder. The piston and parts which operate together with the piston are formed of a thermoplastic polyurethane or an ionomer resin which is equipped with wear-resistance and flexibility, and can elastically absorb powders. Then, the cylinder which relatively operates with the piston and parts integrated with the cylinder are formed of either one of a polybutylene terephthalate, polyamide, polyoxymethylene resin, and a super-high molecular polyolefin resin which is equipped with wear-resistance and hardness. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
[Field of the Invention]
The present invention relates to a dispenser container, particularly to a dispenser container suitable for dispensing contents including powder or granules.
[0002]
[Prior art]
Conventionally, a dispenser container in which a piston and a cylinder that move together with a stem integrated with a nozzle head are relatively slid to discharge the contents from a nozzle by a pump action. 2. Description of the Related Art Dispenser containers for storing and dispensing contained contents are known, and are used for dispensing articles such as cosmetics and pharmaceuticals. The powder contained in the contents may enter the sliding part of the dispenser mechanism depending on its type and blending amount, causing the sliding surface to be worn or causing an increase in operating resistance, thereby hindering smooth operation or disabling operation. And there is a possibility that the sealing property may be impaired. In addition, if the contents contain silicon oil, the silicone applied to the movable part of the dispenser mechanism is washed away, and there is a problem that the movement of the movable part is reduced. In order to solve such a problem, it has been proposed that the material of the sliding portion is changed to a rubber material such as acrylonitrile butadiene rubber (NBR) or silicone instead of the commonly used low density polyethylene (LDPE). I have. However, such a rubber material may add a rubber odor to the contents, and may deteriorate and swell due to silicone oil contained in the contents.
[0003]
Therefore, the present applicant has previously proposed a dispenser container in which the piston and the cylinder in the sliding portion are shielded by a water-tight film to isolate the sliding portion from the contents and prevent the contents from adhering. Such a container is disclosed in JP-A-8-119310, JP-A-8-182945, and the like. However, the use of such a water-tight membrane complicates the structure of the dispenser mechanism, increases the cost, and requires a design change of the dispenser mechanism, and thus has a problem that it cannot be applied to an existing dispenser container.
[0004]
[Patent Document 1]
JP-A-8-119310 [Patent Document 2]
JP-A-8-182945 [0005]
[Problems to be solved by the invention]
INDUSTRIAL APPLICABILITY The present invention does not cause the above-mentioned obstacles due to powder or silicon oil contained in contents, and does not require a design change to an existing dispenser container, and can be applied without complicating the structure. It is proposed that a dispenser container that enables the above is proposed.
[0006]
[Means for Solving the Problems]
Means adopted by the present invention to solve the above-mentioned problem is a dispenser container which is attached to the mouth of the container and which can discharge the contents by a pump mechanism consisting of a piston and a cylinder. A cylinder made of thermoplastic polyurethane or ionomer resin having abrasion resistance and flexibility and capable of elastically absorbing powder, a cylinder movable relative to the piston, and an integral part of the cylinder are provided with abrasion resistance. Characterized by being formed of any of polybutylene terephthalate, polyamide, polyoxymethylene resin, and ultra-high-molecular-weight polyolefin resin having high hardness.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Preferred embodiments of the present invention will be described in detail below. According to the present invention, a piston and a component movable therewith are formed of a thermoplastic polyurethane or an ionomer resin having abrasion resistance and flexibility and capable of elastically absorbing powder, and are movable relative to the piston. The cylinder and a part integral with the cylinder are formed of any of abrasion-resistant and hard polybutylene terephthalate, polyamide, polyoxymethylene resin, and ultra high molecular weight polyolefin resin. A movable piston and a part integral with the piston are formed of thermoplastic polyurethane or ionomer resin, and a cylinder sliding relative to the piston and a part integral with the cylinder are polybutylene terephthalate, polyamide, polyoxymethylene resin, Even if an inorganic powder enters between the piston and the cylinder, it can be elastically absorbed by the flexibility of the piston material by forming it with one of the ultra-high-molecular-weight polyolefin resins, and the wear resistance of the material can be improved. In addition, wear of the piston surface and the cylinder wall can be avoided.
[0008]
When the contents are cosmetics, the inorganic powders contained are silica oxide, titanium dioxide, and zinc oxide, which generally have a size of 1 to 50 μm, and have a plate-like, spherical or amorphous shape. are doing. Silicon oil is cyclic silicon, linear silicon, or the like, and it is known that the lower the molecular weight, the greater the adverse effect on operation.
[0009]
【Example】
With reference to FIGS. 1 and 2, (10) is a main body of the dispensing device attached to the bottle-shaped container mouth, and a cap-shaped fixing portion (11) screwed into the container mouth. A pump mechanism (12) extending toward the bottom inside the container. The pump mechanism (12) is connected to a push button (13) that can be pressed by a finger, and the push button (13) extends upward from the fixing part (11). When the push button section (13) is pressed down with a finger, the pump mechanism section (12) is operated, and the liquid content can be discharged from the container.
[0010]
The pump mechanism (12) includes a cylinder and a piston. The cylinder (20) is vertically provided from the fixing portion (11) also serving as a cap for closing the mouth of the container, and a suction pipe (21) extending to the bottom of the container is connected to a lower portion thereof. (22) is a rod member movably arranged in the lower half of the cylinder (20), and forms a suction valve (23) between the lower end and the inner surface of the bottom of the cylinder (20). (24) is a movable stem extending upward from the cylinder (20), has a discharge hole (25) opened at one lower side, and a lower inner peripheral wall is in sliding contact with the outer surface of the rod member (22); The rod member (22) enters the stem (24) when pushed down during liquid ejection, so that the volume in the stem (24) is reduced and adjusted. (26) is a piston, and (27) is a discharge nozzle. In FIG. 2, the piston (26) is locked at the upper limit position by being locked by the stopper (28), and the discharge hole (25) is closed by the piston (26).
[0011]
When the stem (24) is pushed down via the push button portion (13), the rod member (22) is lowered to close the suction valve (23), and the discharge hole (25) is opened. Thereafter, the piston (26) descends following the stem (24) to pressurize the inside of the cylinder (20), so that the pressurized liquid flows from the gap (29) of the stem (24) to the discharge holes (25) and the stem (24). 24), and is discharged from the discharge nozzle (27) to the outside. When the push button portion (13) is pressed down, the spring (30) stretched between the rod member (22) and the movable stem (24) is compressed, and the elastic repulsive force is accumulated. After the liquid injection is completed, if the pressing force on the push button portion (13) is removed, the push button portion (13) rises due to the elastic repulsive force and returns to the state of FIG.
[0012]
According to the present invention, the movable stem (24) and the piston (26) are formed of a thermoplastic polyurethane or an ionomer resin having abrasion resistance and flexibility and capable of elastically absorbing powder. The cylinder (20) and the rod member (22) that slide relative to the piston are formed of any of abrasion-resistant and hard polybutylene terephthalate, polyamide, polyoxymethylene resin, and ultra-high-molecular-weight polyolefin resin. It was done.
[0013]
As the thermoplastic polyurethane (TPU), Pandex (trademark) of DIC Bayer Polymer Co., Ltd., as an ionomer resin, Himilan (trademark) of Mitsui Polychemicals Co., Ltd., and as polybutylene terephthalate (PBT), polyplastics Co., Ltd. Can be used, and as the ultra-high molecular weight polyolefin, Lubmar (trademark) of Mitsui Chemicals, Inc. can be used. When the Taber abrasion test was performed on the TPU, the ionomer, and the PBT under the conditions of a load of 1 kg and 1000 cycles using a testing machine of the wheel CS-17, the wear amount of the conventional low-density polyethylene was 13 mg. On the other hand, TPU was 3 mg, ionomer was 6 mg, and PBT was 10 mg, each showing good abrasion resistance. The pump mechanism of the dispenser is not limited to the illustrated structure, and the present invention is applicable to dispensers having various pump mechanisms.
[0014]
【The invention's effect】
According to the present invention, the piston and the parts movable therewith are formed of a thermoplastic polyurethane or an ionomer resin having abrasion resistance and flexibility and capable of elastically absorbing the powder. The movable cylinder and its integral parts are made of polybutylene terephthalate, polyamide, polyoxymethylene resin, or ultra-high-molecular-weight polyolefin resin with wear resistance and hardness. Even if the powder is caught between the parts, the powder can be absorbed by the flexibility of the piston portion, and wear of the piston or the cylinder can be prevented. Further, the present invention can be applied without changing the design of an existing dispenser, and cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a partial longitudinal sectional view of a dispenser container according to the present invention. FIG. 2 is a partial sectional view of a main part.
(10) Container body (11) Fixing part (12) Pump mechanism part (13) Push button part (20) Cylinder (21) Suction pipe (22) Rod member (23) Suction valve (24) Movable stem (25) Discharge hole (26) Piston (27) Discharge nozzle (28) Stopper (29) Gap (30) Spring

Claims (1)

A dispenser container attached to the mouth of a container and capable of discharging the contents by a pump mechanism composed of a piston and a cylinder. The dispenser container has abrasion resistance and flexibility, and elastically absorbs powder, with the piston and the parts movable therewith. A cylinder made of a thermoplastic polyurethane or an ionomer resin which can be moved, and which is movable relative to the piston, and an integral part thereof, are made of polybutylene terephthalate, polyamide, polyoxymethylene having wear resistance and hardness. A dispenser container formed of one of a resin and an ultrahigh molecular weight polyolefin resin.

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