Coating processes – Solid particles or fibers applied – Interior or hollow article coating
Patent
1998-06-01
2000-08-01
Kaufman, Joseph A.
Coating processes
Solid particles or fibers applied
Interior or hollow article coating
2224021, 118308, 118318, 118DIG10, 118DIG13, 4272071, 427422, B05D 722
Patent
active
06096376&
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a collapsible metal tube and aerosol can whose inside wall surface is covered with a highly reliable dense resin film that is virtually devoid of pinholes, excellent in elongation at break, and devoid of cracks or other defects caused by folding and other types of deformation; and to a method for manufacturing a collapsible metal tube.
DESCRIPTION OF THE RELATED ART
Collapsible metal tubes from which a paste stored therein is squeezed when the body portion is subject to plastic deformation by pressure have been used to store various foodstuffs, drugs, cosmetics, and the like.
A collaspsible metal tube comprises a body portion composed of metal walls susceptible of plastic deformation, and a shoulder portion and mouth
eck portion connected to one end of the body portion. The other end of the body portion of the collapsible metal tube is sealed by folding and tightening or the like, and the mouth
eck portion is openably closed with a cap.
In such collapsible metal tubes, the metal component of the body portion, or the outside air and moisture (water vapor) entering bit by bit over a long period of time through the fold formed at one end should be prevented from spoiling the contents, while the contents should be prevented from corroding the metal body portion. It has already been proposed in the past to use as such collapsible metal tubes so-called double-tube collapsible tubes, which is obtained by inserting a resin tube having an essentially complementary shape into a metal tube open at one end, packing the contents therein through the open end of the resin tube, and sealing the open end by applying pressure and heat through the metal tube to heat-seal. Problems with such a double-tube type of collapsible metal tube are that a large number of operations are required, it is difficult to align the outer metal tube or cylinder and the inner resin cylinder and to adjust the difference in the dimensional tolerance therebetween, and so forth. In addition, it leads to an inevitable increase in production costs to manufacture such tubes, and they can therefore be used in a very limited applications. Another disadvantage of such collapsible tubes is that it is difficult to remove the contents completely because the internally mounted resin tube tends to restore its original shape due to its thickness and elasticity.
It has also been proposed to use collapsible metal tubes in which a thermosetting resin coating material is sprayed on the inside wall surface of the body portion, and the resulting layer is heated and cured to obtain a thermosetting resin coating such as an epoxy phenolic resin film or a phenol butyral resin film. In such thermoplastic resin films, however, it is virtually impossible to prevent both the formation of pinholes and the formation of cracks by folding and other types of deformation.
That is, thermosetting resins are commonly rigid and are likely to be suffered from cracks or the like when subjected to folding or other types of deformation. This tendency to form cracks is even more pronounced when the film thickness is 15 .mu.m or greater. An additional problem is that coating defects are formed by air bubbles and the like in thermosetting resin coatings during the formation of coatings, and pinholes tend to form in the resin films obtained by heating and curing such films. The pinhole formation becomes even more pronounced when an attempt is made to significantly reduce the thickness of a thermosetting resin film in order to prevent cracking. The pinhole formation can be reduced to some extent by reapplying the coating, but repeated application complicates the coating formation process, and when the number of application cycles is sufficient to achieve a complete elimination of pinholes, the total film thickness results in 20 .mu.m or greater. It is therefore difficult to perform a sufficient number of application cycles in order to prevent the formation of coating defects while keeping the film thickness within a range to cause
REFERENCES:
patent: 3503539 (1970-03-01), O'Donnell
patent: 4064293 (1977-12-01), Nicklas
patent: 4418841 (1983-12-01), Eckstein
patent: 4539259 (1985-09-01), Zuscik
patent: 4693395 (1987-09-01), Tavss et al.
patent: 5203379 (1993-04-01), Holoubek et al.
patent: 5419466 (1995-05-01), Scheindel
Ohnishi Kenji
Yamamoto Yuichi
Kaufman Joseph A.
Taisei Kako Co., Ltd.
LandOfFree
Metallic extruded tube, aerosol can and method of manufacturing does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Metallic extruded tube, aerosol can and method of manufacturing , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Metallic extruded tube, aerosol can and method of manufacturing will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-661360