Cartridge for Viscous Fluid Materials

Abstract

A cartridge for storing and dispensing viscous fluid materials providing excellent productivity and gas barrier properties and free from external appearance defects at the site of film wrapping. The inventive cartridge for viscous fluid materials has a plunger 3 inserted into the bottom portion of a cartridge body 2 fabricated using insert injection molding by integrally molding a cylindrical barrel portion 5 of a multilayer structure produced by laminating a gas barrier layer 8 including a metal thin layer 8a on the exterior periphery or interior periphery of a plastic layer 7, and a lid 6 covering the top of said cylindrical barrel portion.

Description

TECHNICAL FIELD [0001]The present invention relates to a cartridge used for storing viscous fluid materials, and, especially suitably, moisture-curable compositions such as sealing agents, and dispensing the materials onto surfaces to be coated at the moment of use.BACKGROUND ART [0002]Well-known containers used for storing sealing agents include plastic cartridges obtained by molding a lid having a discharge outlet integrally with the top end of a barrel portion made of plastic and, after filling it with a sealing agent, installing a plunger in the opening in the lower end of the barrel portion. Although polyethylene is typically used as the material used for the barrel portion and lid and the thickness of the barrel portion walls, with account taken of the required strength, weight, economic efficiency, etc., is normally set to 1-1.5 mm, due to the characteristics of the material and the pinholes formed during molding, the walls exhibit a certain degree of air permeability and the...

AI Technical Summary

Benefits of technology

[0057]The moisture permeability of the inventive cartridge, as well as the storage stability of sealing agents (micro-particles of cured material, foaming), were investigated to confirm the effects of the invention.

Problems solved by technology

Although polyethylene is typically used as the material used for the barrel portion and lid and the thickness of the barrel portion walls, with account taken of the required strength, weight, economic efficiency, etc., is normally set to 1-1.5 mm, due to the characteristics of the material and the pinholes formed during molding, the walls exhibit a certain degree of air permeability and their outside air-barrier properties are imperfect.

The use of such containers as containers for moisture-curable sealing agents has led to various problems associated with the penetration of outside air, and, in particular, permeation of moisture (water) inside the containers.

For instance, sealing agent curing occurs in the portion, where the sealing agent comes into contact with the surface of the interior walls of the barrel portion and in the portion around the plunger, as a result of which storage life deteriorates, the nonconforming article percentage increases, and dispensing the sealing agent using the plunger becomes difficult.

In addition, if the temperature of adherends such as glass plates, metal plates, metal sash, etc. is elevated, applying a sealing agent that has been stored in the container for an extended period of time to said adherends results in the formation of air bubbles at the interface between the sealing and the adherends.

However, the manufacture of the cartridges described in JP-A No. 2001-240154 requires a composite film wrapping step separate from the step of molding of the cartridge body, and consequently its productivity is not very high.

Moreover, when the composite film is wrapped around the exterior periphery of the cylindrical barrel portion, external appearance is damaged because wrinkles tend to form easily and air remains in the wrinkled portions.

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