JP2000171337A - Apparatus and method for grasping and inspecting structural state of paper structure - Google Patents

Abstract

(57) [Problem] To provide an apparatus and a method for non-destructively and numerically accurately grasping and inspecting whether or not a structural state of a paper structure is in a desired state. A signal generator that generates a signal, a vibrator that vibrates a paper structure in accordance with an output from the signal generator, and a non-contact type or a non-contact type that measures displacement and acceleration of the paper structure A measurement system 1 including a contact-type displacement sensor, an FFT analyzer that performs an FFT process on the output of the signal generator and a measurement output of the non-contact or contact-type displacement sensor and compares the output to obtain a transfer function; And an analysis system 2 comprising comparison means for comparing the basic data with the basic data to determine the state of the structural state of the paper structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for inspecting a paper structure, and more particularly, to an apparatus and method for inspecting the structure of a paper structure.

[0002] Here, the paper structure means a paper box, a paper tray, a paper plate, a paper made of paper, paperboard, or a laminate of such materials and other materials (plastic, metal, carbon, glass, etc.). Cups, paper cartons, liquid paper containers, cardboard, etc.
A paper product having a structure, regardless of its form.
The structural state of the paper-made structure includes its shape, rigidity, constituent parts (seal part, punched part, ruled line part) state, and the like. The seal portion refers to a portion in which a paper structure capable of containing an article is sealed. The punched part is a window, perforated part, etc.
It refers to the penetrating part of the paper structure. The ruled line portion refers to a groove for folding in the material of the paper structure.

[0003]

2. Description of the Related Art Conventionally, a grasping test for judging whether or not the structural state of a paper structure is a desired state has conventionally been performed by applying an external force to the paper structure to check the deformation state of the paper structure. Or by measuring the external force at the time of destruction, or by cutting out a part of the paper structure and measuring the physical properties (bending strength, elongation, tear strength, piercing strength, etc.) of the small pieces. Was.

When the deformation state of the paper structure is checked by the human eyes, it is not possible to accurately determine whether the structure state of the paper structure is in a desired state. There is. On the other hand, when measuring the external force at the time of destruction or cutting out a part of a paper structure and measuring the physical properties of the small pieces, it is possible to accurately judge by numerical values, but it is impossible to grasp and inspect without destruction There is a point

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and non-destructively and numerically accurately ascertains whether or not the structural state of a paper structure is in a desired state. It is an object of the present invention to provide an apparatus and a method for performing the above.

[0006]

In order to achieve the above object, according to the present invention, a signal generator for generating a signal and a paper-made structure according to an output from the signal generator are provided. A vibrator that applies vibration to the body, a non-contact or contact-type displacement sensor that measures the displacement and acceleration of the paper structure, and the output of the signal generator and the measurement output of the non-contact or contact-type displacement sensor A measurement system including an FFT analyzer for performing a FFT process and comparing to obtain a transfer function;
An analysis system including comparison means for comparing the obtained transfer function with basic data to determine the state of the structural state of the paper structure; and grasping the structural state of the paper structure. This is an inspection device.

According to a second aspect of the present invention, the basic data is a transfer function obtained by the measurement system for a paper structure having a desired structural state. This is an apparatus for grasping and inspecting the structural state of a paper structure.

According to the third aspect of the present invention, the paper structure is vibrated by the vibrator in accordance with the output of the signal device, and the displacement and acceleration of the paper structure caused by the vibration are measured in a non-contact type or a contact type. Measuring with a displacement sensor, comparing the output of the signal generator with the measurement output of a non-contact or contact type displacement sensor by FFT processing and comparing to obtain a transfer function, and comparing the obtained transfer function with basic data And an analysis step of determining the state of the structural state of the paper structure.

According to a fourth aspect of the present invention, the basic data is a transfer function obtained by the measuring step for a paper structure having a desired structural state. In this method, the structural state of the paper structure is inspected.

[0010]

Embodiments of the present invention will be described below.

FIG. 1 is a block diagram of an apparatus for grasping and inspecting the structural state of a paper structure according to the present invention. However, the portion indicated by the dotted line in FIG. 1 is not included in the device of the present invention. That is, the paper-made structure represented by the dotted line is a target of the grasping inspection. Solid arrows represent the flow of electrical signals or digital information, and dotted arrows represent the force exerted physically. The apparatus of the present invention includes a measurement system 1 and an analysis system 2. The measurement system 1 includes a signal generator, an amplifier, a shaker, a displacement sensor, and an FFT analyzer. The analysis system 2 includes a comparison unit and a storage unit.

In the following, the flow of the process of the method of the present invention performed by the apparatus of the present invention will be described with reference to the flowchart of FIG. In addition, the measurement system 1 has the following STEP1.
4 and the analysis system 2 executes the following STEPS 5-6.

S (STEP) 1; The output of the signal generator is
The signal is passed through an amplifier, amplified to a desired level, and input to a vibrator. Thus, the shaker excites and vibrates the paper structure.

S (STEP) 2: Displacement and acceleration generated by vibration of the paper structure are measured at one or a plurality of locations by a contact or non-contact displacement sensor.

S (STEP) 3: The output of the signal generator is synchronized with the measurement output of the contact type or non-contact type displacement sensor by using an FFT analyzer and compared, so that the signal generator and the paper structure can be compared. Find the transfer function between

S (STEP) 4; FFT analyzer
The obtained transfer function is passed to comparison means.

S (STEP) 5: The comparison means reads the basic data stored in the storage means. The basic data is a transfer function obtained in advance in steps 1 to 4 executed by the measurement system 1 on a paper structure having a desired structure state.

S (STEP) 6: The comparison means compares the transfer function received from the FFT analyzer with the basic data read from the storage means to determine the state of the structural state of the paper structure.

[0019]

As described above, the apparatus and method for grasping and inspecting the structural state of a paper structure according to the present invention determine whether the structural state of the paper structure is in a desired state. There is an effect that it is possible to perform destructive and accurate grasp inspection by numerical values.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an apparatus for grasping and inspecting a structural state of a paper structure according to the present invention.

FIG. 2 is a flow chart of a method for grasping and inspecting the structural state of a paper structure according to the present invention.

[Explanation of symbols]

 1. Measurement system 2. Analysis system

Claims (4)

[Claims] 1. A signal generator for generating a signal, a vibrator for vibrating a paper structure in response to an output from the signal generator, and a non-contact type for measuring displacement and acceleration of the paper structure Alternatively, a measurement system including a contact-type displacement sensor, an FFT analyzer that compares an output of the signal generator with a measurement output of the non-contact or contact-type displacement sensor to obtain a transfer function, and a transfer function obtained. An analysis system including comparison means for comparing the basic data with the basic data to determine the state of the structural state of the paper structure. 2. The paper structure according to claim 1, wherein the basic data is a transfer function obtained by the measurement system for a paper structure having a desired structural state. Structural condition grasping inspection device. 3. A paper structure is vibrated by a vibrator in accordance with an output of a signal device, and displacement and acceleration of the paper structure caused by the vibration are measured by a non-contact or contact type displacement sensor. A measurement process of obtaining a transfer function by performing an FFT process on the output of the signal generator and a measurement output of a non-contact or contact type displacement sensor to obtain a transfer function; comparing the obtained transfer function with basic data; An analysis step of determining the state of the structural state of the body. 4. A paper structure according to claim 3, wherein said basic data is a transfer function obtained by said measuring step for a paper structure having a desired structural state. Structural condition grasp inspection method.