JPH0430105Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an injection molded container for sealant.
In particular, the present invention relates to a container that is easy to manufacture and does not undergo substantial deformation.

[Conventional technology]

BACKGROUND ART Conventionally, a sealant container is widely known, which has a cylindrical bottom plate with an open end and a front-projecting nozzle formed in the center of the bottom plate for pushing out the contents. A cap is usually attached to this nozzle, and the rear opening of the self-shape-retaining cylindrical body that is difficult to flatten is filled with a sealant, and then the opening is sealed. A plunger that slides and advances while maintaining its airtightness is fitted. In order to ensure more stable airtightness, wax is usually applied to the plunger fitting surface of the inner peripheral surface of the cylindrical portion of the container body. Furthermore, the bottom plate with the nozzle at the tip of the cylindrical container usually has a film impermeable to gases such as water vapor on its inner surface, such as a thin film of aluminum, tin, or other metals or alloys thereof. The plastic laminate and the like are airtightly bonded together with the cap to ensure a high level of airtightness and separation from the outside at the tip of the container.

However, such sealant containers can be easily provided by injection molding using plastic such as polyethylene, but generally have a wall thickness of 0.1 to 0.1 mm, especially 0.5 mm or less.
It is large and has a long length (specifically 100 to 500 mm) compared to its diameter (specifically 30 to 100 mm, especially 40 mm or more).
In this type of sealant container (especially 150 to 300 mm), due to uneven flow in the shoulder cavity during injection molding, it is impossible to avoid deformation of the cylindrical body after molding and unevenness of the outer diameter, which is a practical problem. It was hot.

[Problem that the invention attempts to solve]

Therefore, the purpose of the present invention is to improve the filling characteristics during injection molding in the molding of sealant containers,
An object of the present invention is to provide an injection molded container for a sealant that is free from deformation and non-uniform outer diameter phenomena after molding.

[Means for solving problems]

As a result of many trial production and development studies to solve the above technical problems, the present inventor focused on the shape of the tip of the cylindrical part on the nozzle side of the injection molded container for sealant, and found that the surface of that part is preferable. discovered that by forming a plurality of protrusions on the outer surface at substantially equal intervals in the circumferential direction, the flow of the plastic material during injection molding can be improved, and the objective can be easily and effectively achieved. .

That is, the present invention has a cylindrical plunger that has a sealable plunger for extruding contents that can be hermetically fitted into the inner peripheral surface from an opening at the rear end, and a nozzle that protrudes forward from the center of the bottom plate of the bottomed tip. A container for a sealant made of synthetic resin, wherein the outer periphery in contact with the bottom plate of the container is formed into a slightly inclined tapered shape, and the outer periphery is parallel to the axis of the container and gradually increases in height toward the tip. For a sealant in which a plurality of increasing protrusions are integrally provided at substantially equal intervals in the circumferential direction to form a corner shoulder, and the wall thickness including the protrusions gradually increases toward the tip. This article focuses on injection molded containers.

[Effect]

When the container according to the present invention is injection molded by melting and press-fitting a synthetic resin, such as polyethylene, through one to three gates at the tip of the nozzle, the container according to the present invention usually does not suffer from drifting despite the presence of corner shoulders. This provides a high-quality injection molded container for sealant that has excellent flowability and is particularly free from deformation of the cylindrical body and non-uniformity of the outer diameter.

〔Example〕

Hereinafter, the container of the present invention will be explained in more detail with reference to the accompanying drawings showing one embodiment.

FIG. 1 is a partially cutaway perspective view of an example of the container of the present invention, and FIG. 2 is a cross-sectional view taken along line A-A'.

The sealant cylindrical body 1 is composed of a cylindrical part whose rear end is open and whose tip is closed with a bottom plate having an open nozzle in the center. The plunger 2 that fits into is applied. The plunger 2 is usually a shallow cylindrical body made of metal or plastic, and is formed so that the outer peripheral surface of the bottomed cylindrical body is in close contact with the inner peripheral surface of the cylindrical portion of the cylindrical body 1, and the flat plate of the bottomed cylindrical body is The shaped bottom surface is inserted toward the nozzle side as shown in FIG.
This plunger 2 is applied as a sealing press plate after filling a cylindrical body 1 with silicone or a cyanoacrylate sealant that hardens with water vapor in the air. Wax is usually applied to the fitting portion of the plunger 2. This wax significantly lowers the resistance in the pressing and sliding motion of the plunger for extruding the contents, and therefore also provides a practically desirable effect of improving operability.

Furthermore, a sealing bottom plate 3 for supporting a gas-impermeable membrane (not shown) is integrally molded at the tip of the cylindrical part of the container body, and a nozzle 4 protruding forward is formed in the center of the sealing bottom plate 3 for supporting a gas-impermeable membrane (not shown). It is formed in one piece. This nozzle 4 has a thread 5 formed on its outer peripheral surface, and a sealing cap (not shown) is screwed thereon. Furthermore,
The cylindrical portion in contact with the bottom plate 3 of the container is tapered in an inclined manner, and a plurality of thick portions (in this embodiment, a plurality of protrusions 7, 7, . . .) are formed on the outer peripheral surface of the cylindrical shaft. They are integrally formed substantially parallel and at approximately equal intervals in the circumferential direction. For example, if the outer diameter of the cylindrical part is 50 mm,
For those with a length of 215 mm, the tip 3 is
For example, 20mm from the edge is narrowed slightly towards the tip, and the edge is 2mm or less, specifically 0.5~
The outer diameter is narrowed to about 2.0mm. On the outer surface thereof, for example, twelve protrusions 7 whose height gradually increases toward the tip are provided to form a corner shoulder.
The cross-sectional shape of this protrusion may be square or round,
For example, a trapezoid, a rectangle, a semicircle, a semiellipse, or something similar thereto is generally employed.

[Effect of idea]

The injection molded container for sealant of the present invention is easy to manufacture, and the material of the obtained molded container body is excellent.
It has high dimensional accuracy and is highly practical.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a container according to the present invention, and FIG. 2 is a cross-sectional view of its tip. Symbols in the figure: 1... Cylindrical body, 2... Plunger, 4... Nozzle, 6... Cylindrical part.

Claims (1)

[Scope of utility model registration request] For sealants made of cylindrical synthetic resin, which has a sealing plunger for extruding contents that can be hermetically fitted into the inner peripheral surface from the opening at the rear end, and a nozzle that protrudes forward from the center of the bottom plate of the bottomed tip. The container has a slightly tapered outer circumference in contact with the bottom plate, and a plurality of protrusions on the outer circumferential surface that are parallel to the axis of the container and gradually increase in height toward the tip. An injection molded container for a sealant, which is integrally provided at substantially equal intervals in the circumferential direction to form a corner shoulder part, and the wall thickness including the protrusions gradually increases toward the tip.