JP2002131171A - Method for testing pinhole in rubber glove and pinhole test system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dry pinhole test system with high reliability for a rubber glove. SOLUTION: The pinhole test system 50 is composed of a case 2 having an aperture section 1, an air picker 5 having a tube-like rubber body 3 that is disposed on the aperture section 1 and expanded/contracted by inner pressure, a compressed air supply means K supplying compressed air A1, A2 being regulated into the rubber glove 20 to be tested that is set on inner and peripheral sections of the tube-like rubber body 3 of the air picker 5, a pressure sensor 7 detecting the inner pressure of the rubber glove 20, a digital panel controller 8 used as a processing device that calculates the pressure from outputs of the pressure sensor 7 and sets the pressure in the compressed air supply means K, and a personal computer 10 used as a calculating device that receives outputs from the digital panel controller 8 and carries out good/bad judgements based on the variation per hour of the pressure in the rubber glove and outputs the result. The variation per hour of the pressure in the rubber glove 20 is divided into a plurality of timing steps, and the pressure at each timing step is compared with each reference, and the good/bad judgements are carried out using the comparison data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pinhole inspection apparatus used for inspection at the final stage of manufacturing synthetic resin gloves, which are generally called rubber gloves.

[0002]

2. Description of the Related Art Rubber gloves are industrial products used in various fields, such as general household use, industrial use such as semiconductor manufacturing, medical use, fisheries, construction, and the like. Various materials, shapes and thicknesses such as silicone rubber and chlorosulfonated polyethylene rubber (a synthetic rubber having excellent ozone resistance) have been commercialized.

[0003] The reliability of this rubber glove product, particularly the reliability of industrial rubber gloves, is determined by examining the presence or absence of pinholes that occur rarely in the rubber glove manufacturing process to determine the quality of the product in the final process. Needless to say, it depends.

Conventionally, as a method for inspecting a pinhole of a rubber glove as described above, similar to a method for specifying a punctured portion when repairing a puncture of a bicycle tire, the rubber glove is inflated to the extent that the rubber glove is not deformed. A method has been adopted in which air is sealed by pressure and an expanded rubber glove is submerged in a container filled with water to visually inspect the generation of air bubbles.

[0005]

However, in the above-mentioned conventional pinhole inspection method, since the rubber gloves are completely wetted by water, it takes time to dry the gloves, and is more difficult to apply to rubber gloves with a backing cloth. Met.

Further, visual inspection of air bubbles may cause inspection leakage or inspection unevenness, and it is hard to say that this is an excellent pinhole inspection.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a highly reliable rubber glove pinhole inspection device which is a dry inspection using no water and can be mechanically and stably inspected. With the goal.

[0008]

In order to solve the above-mentioned problems, the present invention has the following objects. (1) An outer peripheral surface of a hem opening of a rubber glove to be inspected is sealed on the inner wall of a case or a frame with a sealing member. Step of sealing the inside of the rubber glove by pressing the rubber glove from the outside, step of inflating the inside of the rubber glove by putting compressed air thereinto, measuring the internal pressure of the expanded rubber glove, and time-dependent change of the internal pressure of the rubber glove. And a step of determining whether or not there is a pinhole in the rubber glove. (2) Further, in the method for inspecting a pinhole of a rubber glove according to the above (1), data obtained by dividing a temporal change of the internal pressure of the rubber glove into a plurality of stages according to time and comparing the pressure at each stage with each reference value. A method for inspecting a pinhole of a rubber glove, wherein the method is used for quality determination. (3) an air picker including a case having an opening, a tube-shaped rubber body arranged in the opening of the case and expanding and contracting by an internal pressure, and a tube of the air picker that has adjusted pressure air. Compressed air supply means for supplying the rubber glove body and the rubber glove to be inspected set on the outer periphery of the tubular rubber body, a pressure sensor for detecting an internal pressure of the rubber glove, and a pressure from an output of the pressure sensor. And a processing device that calculates the pressure of the compressed air supply means and calculates the pass / fail of the pressure in the rubber glove with the passage of time from the output of the control processing device and outputs the result. A pinhole inspection device for rubber gloves, comprising:

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a pinhole inspection apparatus and a pinhole inspection method according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a system diagram illustrating a system for supplying electricity and air of a pinhole inspection apparatus according to the present invention. FIG. 2 is a view for explaining a sealing mechanism using a case and an air picker in the pinhole inspection apparatus. FIG. 3 is an internal structure diagram illustrating a state of a pinhole inspection of a rubber glove by the pinhole inspection device. FIG. 4 is a flowchart showing the procedure of the pinhole inspection method of the rubber glove of the present invention,
FIG. 5 is a diagram showing a state of the rubber glove set in the inspection device. FIG. 6 is a graph illustrating the change over time of the internal pressure of the rubber glove and the criterion for judging the quality of the test (the horizontal axis indicates the elapsed time, and the vertical axis indicates the internal pressure and the panel display numerical value).
The pressure values described below are expressed by gauge pressure (= absolute pressure-atmospheric pressure).

Referring to FIGS. 1 to 3, a pinhole inspection device 50 for a rubber glove according to the present invention shown in FIG. 1 includes a case 2 having an opening 1 as shown in FIG.
And an air picker 5 having a tubular rubber body 3 which expands and contracts with an internal pressure, and compresses compressed air A1 and A2 adjusted as shown in FIG. 3 into the tubular rubber body 3 of the air picker 5. Compressed air supply means K for supplying the rubber glove 20 to be inspected set on the outer periphery of the tubular rubber body 3, a pressure sensor 7 for detecting the internal pressure of the rubber glove 20, and an output of the pressure sensor 7. Digital controller 8 as a processing device for calculating the pressure from the compressor and setting the pressure of the compressed air supply means K
And a personal computer 10 as an arithmetic unit that receives the output of the digital panel controller 8 to determine the acceptability of the pressure in the rubber glove with the passage of time and outputs the result. In addition, the inspection device 50 in FIG. 1 is provided with a compressor 6, a pressure gauge M, solenoid valves V1 to V5, a regulator R, a low-pressure auxiliary tank 11, and the like as the compressed air supply means K. Sequencer 9, digital switch 12, work detection photoelectric sensor 13, OK (good) indicating the result of pass / fail judgment, NG
(No), light emitting element 14 of FZ (re-examined while straddling the pass / fail boundary), run button 15 / stop button 1
6. A guide cone 18 and a guide pin 19 for easily setting the solenoid valve switch 17 and the rubber glove 20 to be inspected are provided as appropriate.

Hereinafter, the main members will be described in detail. The pressure / pressure sensor 7 detects the attenuation of the pressure of the test air supplied into the rubber glove 20 to be inspected.
For example, a device having a specification of 24 VDC input, 4 to 20 mA output, and a detection range of 1 KPa to 100 KPa is used.

The digital panel controller 8 performs A / D conversion of an output from the pressure sensor 7 to perform pressure setting. The input DC 24 V, the output PNP, and the pressure setting are defined as HH, HI, LO, and LL described later. Steps, resolution 1/5
0, display 4 digits, standard setting is done by parameter input.

The air picker 5 seals the hem opening 21 of the rubber glove 20 shown in FIG. 3, and as shown in FIG. 2A, a tubular rubber body 3 containing fibers is used. Ring-shaped metal fittings 5b, 5c on aluminum cylinder 5a
The compressed air A1 of 0.3 MPa to 0.5 MPa is introduced into the air inlet IN at the intermediate portion between the ring 5b and the ring 5c as shown in FIG. I have. The air picker 5 used has, for example, an outer diameter of 55 mm at a maximum working pressure of 0.5 MPa and 0.0 MPa, and an outer diameter of 100 mm at 0.5 MPa.

The case 2 is a so-called closed case (cylindrical shape) having an opening 1 on one side. The air picker 5 is disposed inside the case 2 so that compressed air A1 and A2 can be supplied from outside through different routes. It has become. Note that case 2
Is a configuration in which the tubular rubber body 3 of the air picker 5 expands and abuts on the inner wall even if it is simply a circular frame, in other words, it is surrounded by the air picker 5 and the bottom of the case 2 in FIG. A configuration in which a closed space is not formed may be used.

The rubber glove 20 is hermetically sealed by expanding the outer periphery of the hem opening 21 of the rubber glove 20 from inside by expanding the tubular rubber body 3 of the air picker 5 with compressed air A1 (seal air).
This is performed by pressing against the inner wall of the opening 1 of the case 2. When this pressure (= seal pressure) is increased, the contact area of the inner wall of the case 2 increases, and even if there is some unevenness on the surface of the rubber glove 20, the seal area can be secured and the hermetic seal is performed well. Appropriate sealing pressure is about 0.2MPa ~
Although the pressure is 0.4 MPa, the case 2 is previously inspected for leakage of seal air using a soap solution or the like at a contact portion between the case 2 and the outer periphery of the hem opening 21 of the rubber glove 20. It is important to set as
According to the test of the present inventor, it was found that most rubber gloves can be used if the sealing pressure is 0.4 MPa or more.
In addition, since the resin on the outer surface of the rubber glove 20 is pressed against the inner wall of the case 2, sealing can be performed regardless of the material inside the rubber glove 20, and a back cloth product, a flocking process, and a middle hand insertion product Pinhole inspection can be performed even with rubber gloves.

Next, the compressed air A2 of the test air in the rubber glove 20 is introduced into the case 2 through a pipe attached to the bottom of the case 2 as shown in FIG. The rubber glove 20 is passed through and introduced into the rubber glove 20 to expand the rubber glove 20. At this time, it is desirable to gradually increase the supply pressure by the regulator R for test air so that the swelling of the rubber glove 20 from the wrist to the hem opening 21 becomes slightly larger than the normal state. The change over time of the pressure decay between the rubber glove that has been confirmed to be non-existent and that with the pinhole is compared, and the pressure at which a clear difference can be recognized is set as the appropriate pressure of the test air. According to the experiment, the appropriate pressure of the test air is 2
The range of KPa to 15 KPa was good. While the air pressure in the air picker 5 is 0.2 MPa to 0.4 MPa, the internal pressure of the rubber glove 20 is at most 15K.
Since the internal pressure of the rubber glove 20 is
Will not be deformed.

Next, in the pinhole inspection method, the outer peripheral surface of the hem opening 21 of the rubber glove 20 to be inspected is sealed on the inner wall of the case 2 using the inspection device 50 as described above. Pressing the rubber glove 20 from inside to outside to seal the inside of the rubber glove 20, injecting compressed air A2 into the inside of the rubber glove 20, and expanding the rubber glove 20, and internal pressure (test pressure) of the expanded rubber glove 20 And a step of judging the presence or absence of a pinhole based on a change with time in the internal pressure of the rubber glove 20. In particular, as shown in the graph of FIG. 6, the time-dependent change of the internal pressure of the rubber glove 20 is divided into a plurality of stages (DM1, DM2, DM3, DM4) according to time, and the pressure changes at each stage are obtained in advance by experiments. If the pass / fail judgment is made by comparing with a reference value, precise pass / fail judgment can be realized.

When inspecting a stretched resin rubber glove, the test pressure is set low (min2 KPa) so that the shape of the glove does not change, and the data of the glove with a pinhole and the data without the glove are measured. Are integrated to determine a standard comparison value. Similarly, for a glove having a resin or a pure cloth with a small elongation, a higher test pressure that does not significantly change the shape of the glove is set (max 15 KPa).
However, it is important to determine the comparative value by accumulating the same data as for the ultrathin gloves.

In the hermetically sealed structure using the case 2 as in the present embodiment, the internal pressure of the rubber glove 20 and the internal pressure of the closed space of the case 2 are equalized, so that the resin elongation standby time required for pinhole detection is reduced. A long air leak time can be taken, and as shown in FIG. 5 (b), the untestable portion is only the resin portion of the hem opening 21 of the rubber glove 20, which is about 20 mm wide, so that a wide range of inspection is possible. The pinhole can be inspected with high accuracy.

Next, the operation procedure of the rubber glove pinhole inspection device 50 of the present invention will be outlined with reference to the flow charts shown in FIGS. 1 and 4. After setting the pressure of the digital controller 8, (a) FIG. As shown in (a), the hem opening 21 is put on the tubular rubber body 3 of the air picker 5 while covering the guide cone 18 with the rubber glove 20 as shown in (a), (b) the inspection is started with the operation button 15, and (c) the seal solenoid valve V5 And open the compressed air A1 (0.2 MPa to 0.4 MPa) with the air picker 5.
(D) Next, the compressed air A2 of the test air in which the solenoid valves V1 to V4 are opened and the optimal pressure is set in the range of 2 KPa to 15 KPa is supplied to the rubber glove as shown in FIG. (E) Then, after waiting for the elongation time of the rubber glove 20, the pressure inside the rubber glove 20 and the inside of the case 2 communicating therewith are reduced as shown in FIG. The pressure sensor 7 detects the change with time (see the graph of the decay curve in FIG. 6), and outputs the change with time in the digital panel controller 8. The arithmetic processing for comparing DM4 with each of the reference values CNT1 to CNT4 is performed (f), (g), (h), (li), (nu) the inspection is completed and the quality is determined, and the result is determined as OK, NG, or FZ light emitting element 14.
(ル) Open the seal solenoid valve V5 to open the sealed state. (ヲ) Pull out the rubber glove 20.

By setting a routine number suitable for the type of the rubber glove 20 to be inspected, if this is selected and the inspection is started, the work detecting photoelectric sensor 13 provided as appropriate detects and detects the inspection device 50. May be automatically driven.

[0023]

Since the pinhole inspection apparatus according to the present invention is configured as described above, it has the following effects.

(1) It is possible to perform pinhole inspection with high accuracy over a wide range.

(2) Various gloves can be inspected irrespective of the material inside the rubber glove without being wetted by water in a dry system.

(3) Since a pressure decay detection system using a small pressure of air is employed, no stress is applied to the gloves.

(4) Because of the mechanical judgment, a more stable inspection can be performed than a visual inspection.

[0028]

[Brief description of the drawings]

FIG. 1 is a system diagram illustrating a system for supplying electricity and air of a pinhole inspection apparatus according to the present invention.

FIG. 2 is a diagram illustrating a sealing mechanism using a case and an air picker in the pinhole inspection device.

FIG. 3 is an internal structural diagram for explaining a pinhole inspection state of a rubber glove by the pinhole inspection device according to the present invention.

FIG. 4 is a flowchart showing a procedure of a pinhole inspection method for a rubber glove according to the present invention.

FIG. 5 is a view showing a state of a rubber glove set in the pinhole inspection device according to the present invention.

FIG. 6 is a graph for explaining the change over time of the internal pressure of the rubber glove and the criterion for judging the quality of the test (the horizontal axis indicates the elapsed time, and the vertical axis indicates the internal pressure and the panel display numerical value).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Opening 2 Case 3 Tubular rubber body 5 Air picker 6 Compressor 7 Pressure sensor 8 Digital panel controller 10 Personal computer 14 Light emitting element 18 Guide cone 20 Rubber glove 50 Pinhole inspection device A1, A2 Compressed air K Compressed air supply means M Pressure gauge V1 to V5 Solenoid valve R Regulator

Claims (3)

[Claims] 1. A step of pressing an outer peripheral surface of a hem opening of a rubber glove to be inspected against an inner wall of a case or a frame body from the inside of the rubber glove with a sealing member to seal the inside of the rubber glove; A step of measuring the internal pressure of the expanded rubber glove, the step of measuring the internal pressure of the expanded rubber glove, and the step of determining the presence or absence of a pinhole based on the change over time in the internal pressure of the rubber glove. Rubber glove pinhole inspection method. 2. The method for inspecting a pinhole of a rubber glove according to claim 1, wherein a time-dependent change in the internal pressure of the rubber glove is divided into a plurality of stages according to time, and data obtained by comparing the pressure at each stage with each reference value is obtained. A pinhole inspection method for rubber gloves, which is used for quality judgment. 3. An air picker comprising: a case having an opening; a tube-shaped rubber body provided in the opening of the case and expanding and contracting by an internal pressure; Compressed air supply means for supplying the rubber glove body and the rubber glove to be inspected set on the outer periphery of the tubular rubber body, a pressure sensor for detecting an internal pressure of the rubber glove, and a pressure from an output of the pressure sensor. And a processing device that calculates the pressure of the compressed air supply means and calculates the pass / fail of the pressure in the rubber glove with the passage of time from the output of the control processing device and outputs the result. A pinhole inspection device for rubber gloves, comprising: