Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1989-08-15
1991-09-17
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250223B, G01B 1102
Patent
active
050497502
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to an apparatus and system for inspecting a wall thickness of a container of a cylindrical bottomed structure made of synthetic resin and adapted to be filled with any kind of drink such as soft drink, juice or like drink (called merely drink hereinafter).
PRIOR ART
Recently, soft drinks have been sold in a state of being filled in a container having a large volume and, generally, the container of this type is made of a polyethylene terephthalate resin (PET resin). The drink is heated to a relatively high temperature of about 85.degree. when the drink is filled into the container, so that an opening portion and a shell portion of the container may be deformed by the heated drink upon the filling thereof. Moreover, when the container filled with the heated drink is closed with a lid and, thereafter, cooled, an inner pressure in the container is lowered, so that the shell of the container may be deformed inwardly. Such adverse phenomenon will be caused when a container having a shell with a long longitudinal length is utilized. In order to obviate this adverse phenomenon, there has been proposed a container having the shell provided with a column like portion extending in the axial direction of the container and having a corrugated section to strengthen the structure of the shell of the container. However, the provision of such container does not necessarily adequately obviate the defects described above.
In another aspect, in order to obviate the defects, the opening portion of the container is crystallized to provide a heat resisting property or is formed of a heat resistant resin. However, in the latter mentioned method, there is a problem in that it becomes impossible to inspect the wall thickness of the container in a case where the PET resin and the heat resistant resin have the same color or are both transparent. In the meantime, regarding the shell of the container, a destructive inspection based on a sampling method can be utilized for the inspection of products, but this inspection involves unstable requirements for the manufacture of the container and, particularly, in a case where there is a fear of an unforeseen occurrence of a faulty product, it is absolutely necessary to carry out 100% inspection of the containers.
Taking the above matters into consideration, the applicant of this application has proposed an inspection method and device, for the opening of the container, for measuring an amount of a heat resistant resin by utilizing the nature of the PET resin which has the permeability, or allows the transmission of ultraviolet rays with specific wavelengths larger than that of the heat resistant resin (Japanese Patent Application No. 61-289864). The applicant has further proposed a container rotating mechanism for improving the inspection accuracy by holding the container securely and smoothly rotating the same (Japanese Patent Application No. 62-7743). According to the method and device proposed above, it becomes possible to incorporate a process for inspecting the heat resistance of the opening portion of the container into a continuous automatic container manufacturing line. It becomes also possible to measure, at the same time, the degree of transparency, verticality, height, amount of bubbles in the opening portion and air tightness of the container.
With the inspection to the heat resistance of the container, the inspection of the opening portion can be sufficiently made by measuring the amount of the heat resistant resin of the opening, whereas it is absolutely necessary for the inspection of the shell portion to measure the wall thickness of the shell because it is required for the container to have some degree of thickness to keep the good heat resisting property of the shell of the container.
The measurement of the wall thickness of the container is performed by direct destructive means in which the shell of the container is cut and the thickness thereof is measured, or by non-contact or non-destructive means in which many kinds of rays or
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Hoshino Masaru
Nose Hiroaki
Dai Nippon Insatsu Kabushiki Kaisha
Dunn Drew A.
Fields Carolyn E.
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