Cartridge for Viscous Fluid Materials

a fluid material and viscous technology, applied in the field of carts, can solve the problems of wall air permeability, imperfect outside air barrier properties, and penetration of outside air

Inactive Publication Date: 2008-07-03
DOW CORNING TORAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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  • Cartridge for Viscous Fluid Materials
  • Cartridge for Viscous Fluid Materials
  • Cartridge for Viscous Fluid Materials

Examples

Experimental program
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Effect test

example 1

[0058]A cartridge body A having a cylindrical barrel portion provided with a gas barrier layer 8 on its exterior periphery, such as the one shown in FIG. 1 and FIG. 2, was fabricated by insert injection molding using polyethylene resin as the injection molding resin and a composite film having a layered structured obtained by laminating a PE layer, AL foil, a PET layer, and an OPP layer as an insert film for a gas barrier layer.

[0059]The resultant cartridge body 1A has a shape, in which one end of the cylindrical barrel portion is covered with a lid portion 6 provided with a cylindrical opening portion (discharge portion) in the center thereof, with the body having an internal diameter of 48 mm, a total inner length of 213 mm, and a volume of approximately 381 mm3. Its cross-sectional structure is a layered structure, in which there is a plastic layer 7 made entirely of high-density polyethylene resin, the wall thickness of the cylindrical barrel portion is 1.15 mm, and a gas barrie...

example 2

[0062]A cartridge body B having a cylindrical barrel portion provided with a gas barrier layer on the interior periphery thereof, such as the one shown in FIG. 1 and FIG. 3, was fabricated by insert injection molding using the same injection molding resin and composite film as in Example 1.

[0063]The shape and dimensions of the resultant cartridge body B were identical to those of Example 1. Its cross-sectional structure, however, was a layered structure, wherein a gas barrier layer made up of a PE bonding layer, an AL foil layer, a PET layer, and an innermost OPP layer was provided on the interior periphery of the cylindrical barrel portion.

[0064]In the same manner as in Example 1, cartridge body B had a seal film 10 fused to the lid portion 6, a threadedly engaged nozzle 4, and a mixture of polybutene and microcrystalline wax (mixing ratio: 6:4) applied to the interior peripheral surface of the opening portion at the other end.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B65D88/54
CPCB32B15/08B65D23/02B65D83/0005B32B27/36B32B1/02B32B2255/10B65D23/0835B32B2307/514B32B2307/7242B32B2439/00B32B15/20B32B27/08B32B27/32B32B2255/205B05C17/01B05C17/00576B65D83/00
Inventor NAKAYAMA, TOHRUMORI, HIDEYUKI
Owner DOW CORNING TORAY CO LTD
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