Coating processes – Interior of hollow article coating – Rotating the article
Patent
1996-03-22
1998-06-09
Beck, Shrive
Coating processes
Interior of hollow article coating
Rotating the article
427230, 427233, 427234, 427236, 427240, 427424, 427425, 118 52, 118 55, 118313, 118317, 118318, 118319, 118320, 118321, B05D 722, B05D 312, B05D 102, B05L 500
Patent
active
057630046
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an appliance for introducing sealing compound into lug caps. The invention further relates to a process for introducing sealing compound into lug caps and to the use of the appliance for injecting sealing compound into lug caps.
BACKGROUND AND SUMMARY OF THE INVENTION
Lug caps are used to close packages such as jars and glass preserves. The purpose of the various packaging materials is hermetic sealing of the contents against the environmental effects, even under extreme conditions as exist, e.g., in the heat sterilization of foodstuffs. In order to ensure this insulation of the contents from the environment, lids and caps with which the package is closed have suitable sealing compounds introduced thereinto. Commercially, i.e. economically satisfactory sealing compounds for closures must have a number of critical properties which make them into highly specialized materials and compositions. Furthermore, the properties required of the sealing compounds are also, inter alia, determined by the intended use of the packagings.
In the case of packaging for foodstuffs, particular significance attaches to the stability of the sealing compounds with respect to the contents during sterilization or pasteurization, respectively, and during the storage, often for years, of the packed foodstuffs. Normally, use is made, for caps and lids of packages made of metal, of sealing compounds made of plasticizer-containing PVC plastisols as described, in the case of caps for jars, for example in DE B-20 03 693. In addition to said PVC sealing compounds, sealing compounds based on polyurethane are also known, however.
Sealing compounds can be applied in injection machines to the inside of the closures. In so doing, the problem arises on the production scale that the introduction of the sealing compound can not always be carried out in a defect-free manner, i.e. not always seamlessly. Also, high spinning speeds are often necessary on injection machines in order to correct any defects formed. The high spinning speeds are intended to subsequently ensure a uniform distribution of the injected sealing compound. Furthermore, complicated electronic control mechanisms are required for correcting the seams.
Moreover, it is difficult on the laboratory scale to manufacture, for testing purposes, lug caps provided with sealing compounds. There is, however, the requirement of manufacturing, for testing purposes, internally coated lug caps provided with polymer compounds, in order to test the efficacy of newly developed sealing compounds and, in particular, the efficacy of the sealing compounds on various inner coatings of the caps. Thus there is a need for a simple, cost-effective appliance for introducing sealing compounds to the previously coated inside of lug caps or to coated circular blanks having a sealing-compound sprue, which are inserted into neutral closures.
The object of the present invention therefore is to provide an appliance for introducing sealing compounds into lug caps made of metal for test purposes, i.e. at the laboratory scale. At the same time, the appliance should be as cost-effective and practical as possible, function in a simple manner and insert the sealing ring with high accuracy. It should be possible, by providing said appliance, to dispense with the otherwise required occupation of production lines. By means of the appliance to be newly developed, it should be possible to carry out in a rapid and simple manner sterilization tests or the testing of the caps on the preserve jars, using a very wide variety of sealing compounds and a very wide variety of coating systems for the inner coating of the caps. Introduction of the sealing compound is to take place uniformly with accurate compound coverage and without discernable seams. The appliance, to be operated on a laboratory scale, should be able to dispense with high spinning speeds which have hitherto been in general usage in injection machines for sealing compounds in order to correct defects. Moreover,
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Barr Michael
BASF Lacke & Farben AG
Beck Shrive
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