JPH10235739A - Method of manufacturing bar code label-affixed coupling and apparatus for printing bar code - Google Patents

Abstract

PROBLEM TO BE SOLVED: To yield the cost reduction of a heating coil, the improved yield of articles, and shortened electrification period of time by relaxing the limitation of a heating coil resistance value. SOLUTION: The resistance value of a melt-joint heating coil is measured by a measuring device 11, and on the basis of the measured resistance value thereof, an electrification period of time to the heating coil is calculated by an electrification calculating part 13 to subsequently convert the data of the calculated electrification period of time in a bar code in a bar code producing part 12, followed by printing the converted bar code on a label 16 by a label printer 15; then the printed label 16 is stuck on a molded melt-joint.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fusion joint in which opposite ends of a pipe member are fitted so as to abut each other and are fused, and more particularly, information on the fusion joint is represented by a bar code. The present invention relates to a method for manufacturing a fusion-bonded joint with a bar code label, in which a label printed as is adhered to the surface. The present invention also relates to a bar code label printer for creating the bar code label.

[0002]

2. Description of the Related Art A fusion joint for connecting a pipe member such as a polyethylene pipe (water pipe, gas pipe, etc.) has a heating coil therein. Heat is generated by energizing the heating coil, and the heat fuses the pipe members.

[0003] The degree of fusion of the pipe member is determined by the amount of heat generated by the heating coil, and the amount of heat generated is determined by the resistance value of the heating coil and the energizing time. Conventionally, as a means for determining the energization time, a plurality of types (for example, 20 types) of standard resistance values of the heating coil are set according to the type and diameter of the fusion joint, and the heating coil of the fusion joint of a certain type is set. Has been strictly controlled so that the resistance value falls within an error range (for example, ± 3%) of the standard resistance value set correspondingly, and the fusion joint has been manufactured.

At the manufacturing stage, a label printed by converting information (shape, type, diameter, standard resistance value, etc.) of the fusion joint into a bar code in advance is attached to the fusion joint during the production. ing. Then, in the final step of the manufacturing stage, the resistance value of the heating coil of the fusion joint is measured by a resistance measuring device (such as a tester), and the standard resistance value printed on the label is read by a bar code reader, and the measured resistance value All the products are inspected by the operator to see if the value is within the error range of the standard resistance value. Here, if the measured resistance value is not within the error range of the standard resistance value, the fusion joint is determined to be defective.

That is, as shown in the table of FIG. 3, for example, when the standard resistance value of a certain fusion joint An is 10 Ω, the heat quantity required for fusion is 15 kcal, the energization time when a voltage of 50 V is applied. Is 66 seconds, the measured resistance value of the fusion joint A1 is 10Ω (± 0%),
2 has a measured resistance value of 10.3Ω (+ 3%), and the fusion joint A3
Is 9.7 Ω (−3%), and the energization time is set to 66 sec. On the other hand, fusion joint A
4 has a measured resistance value of 10.5Ω (+ 5%), and the fusion joint A5
Is 9.5 Ω (−5%), these fusion joints A4 and A5 are determined to be defective. However, A1 to A5 are fusion joints of the same type.

In addition, the energization time is uniquely set in accordance with one standard resistance value of a certain type and a certain diameter, and the resistance value of the heating coil of the fusion joint to which this standard resistance value is applied is: Actually, an error of ± 3% is allowed. for that reason,
Since it is necessary to ensure sufficient fusion in all the heating coils having a resistance value within the error range (9.7 to 10.3 Ω in the case of the fusion joint A shown in FIG. 3),
The energization time is set slightly longer than the energization time obtained for the standard resistance value.

In the case of the above-mentioned fusion joint An, if the optimal energizing time for a standard resistance value of 10Ω is 60 seconds, the optimal five electric time for 10.3Ω which is the upper limit of the error range is 63 seconds. , Standard resistance value 10
Conventionally, the energization time corresponding to Ω is set to 66 sec, which is 63 sec with some margin.

[0008]

As described above, the conventional fusion joint uses the conduction time corresponding to the standard resistance value as the conduction time when the manufactured fusion joint is actually used. For this reason, since the resistance value of the heating coil is strictly controlled to be surely within the error range of the standard resistance value, there is a problem that the cost of the heating coil is high.

In addition, even if the heating coil is strictly controlled in this way, the resistance value may exceed the error range in some cases. Even when the heating coil is within the error range, the resistance value may be increased due to the tension when the heating coil is wound. In some cases, it changes and exceeds the error range when the fusion joint is manufactured. A fusion joint using a heating coil exceeding such an error range is determined to be defective by a resistance test after manufacturing, and thus has a problem in that the product yield is reduced.

In addition, since it is necessary to guarantee sufficient fusion with a uniquely set energizing time corresponding to the standard resistance value, the energizing time is set to be slightly longer than the actually necessary energizing time. There was a problem that it took time for construction on site. In other words, when welding a pipe member with one fusion joint, this does not cause much problem. However, when dozens of fusion joints are used, the energization time set for a slightly longer time is the total time. Only, the whole construction time will be extended.

The present invention has been made in order to solve such a problem. The object of the present invention is to reduce the cost of the heating coil by relaxing the regulation of the resistance value of the heating coil. An object of the present invention is to provide a method for manufacturing a fusion spliced joint with a bar code label and a bar code label printer device, which can improve the product yield and shorten the energization time.

[0012]

According to a first aspect of the present invention, there is provided a method of manufacturing a fusion spliced joint with a bar code label, wherein a heating coil is provided on an inner peripheral surface side of a tubular joint main body. A fusion joint having a structure in which electrode terminals connected to both ends of the heating coil are provided on the outer peripheral surface side is formed by injection molding, and thereafter, the resistance value of the heating coil is measured, and the measurement is performed. The energizing time to the heating coil is calculated based on the resistance value, and the calculated energizing time is affixed to the manufactured fusion joint with a label printed as barcode information.

According to a second aspect of the present invention, there is provided a bar code label printer, comprising: a measuring means for measuring a resistance value of a heating coil provided on the inner peripheral surface side of the fusion joint; and a measuring means for measuring the resistance value. And a printing unit that converts the energizing time calculated by the calculating unit into bar code information and prints the bar code information on a label.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of a method of manufacturing a fusion joint with a bar code label according to the present invention. FIG. 1 shows a molding step of the fusion joint, and FIG. 1 shows a barcode label printer device used in a label creation step of creating a barcode label to be created.

First, the forming process of the fusion joint with a bar code label will be described. However, the forming process described here is merely an example, and various other forming processes have been conventionally performed. Also, here, an EF (Electro-Fusion) joint called a cheese will be described as an example.

That is, the core 1 (see FIG. 1A)
After the heating coil 2 for welding is wound a predetermined number of times (see FIG. 3B), the electrode terminals 3 and 4 are attached to both ends of the heating coil 2 by caulking or the like (see FIG. 3C). Then, it is loaded into the injection molding machine 5 to perform injection molding [see FIG. After molding, it is taken out of the injection molding machine 5 and put into the cooling water tank 6 [see FIG. (E), after which the core 1 is pulled out by a drawing machine (not shown), and FIG.
The fusion joint An having the appearance shown in FIG. That is, the heating coil 2 is provided on the inner peripheral surface side of the tubular joint body 7,
A fusion joint An having a structure in which electrode terminals 3 and 4 connected to both ends of the heating coil 2 protrude from the outer peripheral surface side is formed.

Next, a procedure for producing a label of the formed fusion joint An using the bar code label printer shown in FIG. 2 will be described. This bar code label printer device was measured by a resistance measuring instrument (measuring means) 11 for measuring the resistance value of the heating coil 2, a bar code creating section 12 for converting various information into a bar code, and a resistance measuring instrument 11. An energization time calculation unit (calculation means) 13 for calculating the energization time based on the resistance value; and various information (type, size,
It comprises a data input unit 14 for inputting a molding date, etc.) and a label printer 15 for printing the barcode created by the barcode creation unit 12 on a label 16. The printing means according to the second aspect comprises a barcode creation unit 12 and a label printer 15 in this embodiment.

That is, in the bar code label printer, the measuring connectors 11a and 11b of the resistance measuring device 11 are connected to the two electrode terminals 3 and 4 of the formed fusion joint An, respectively, and the resistance of the heating coil 2 is reduced. Measurement is performed, and the measurement data is input to the barcode creation unit 12. The barcode creation unit 12 inputs this measurement data to the energization time calculation unit 13.

The power-on time calculating section 13 calculates the power-on time of the fusion joint An based on the resistance value indicated by the measurement data. Here, in the fusion by the fusion joint An,
The criterion for judging "fused" is whether or not the fusion interface temperature of the fusion joint An has reached a specified temperature. The amount of heat generated from the heating coil 2 in the fusion joint An until the temperature reaches the specified temperature (for example, 200 ° C.)
From the type and diameter of n, the winding area of the heating coil, and the like, a fixed amount is determined for each type and diameter of the fusion joint.

Therefore, the energization time T required for fusion is
Sets the resistance value (actually measured value) of the heating coil of that type to R
(Ω), and when the applied voltage value is E (v), it can be calculated by the following equation (1) according to Joule's law.

[0021]

## EQU1 ## Q = (E ² / R) × TＥT = Q / (E ² / R) = Q × R / E ² (sec) (1) In this way, the energization time calculation unit The energization time of the fusion joint An calculated by 13 is input to the barcode creation unit 12.

The barcode creating unit 12 converts the data of the energizing time input from the energizing time calculating unit 13 and the data of the type, size, molding date and the like input from the data input unit 14 into a barcode. After conversion, the barcode is printed on the label loaded in the label printer 15 and output. Then, the label 16 thus output is attached to the formed fusion joint An, thereby completing the production of the fusion joint An with the bar code label.

FIG. 3 shows measured resistance values (Ω) of five types of fusion joints A1 to A5 of the same type.
The energization time (sec) obtained from the measured resistance value by the above equation (1) is shown in comparison with the conventional case.
That is, A4, which was conventionally treated as a defective product,
Regarding the fusion joint of A5, these fusion joints A4, A
By printing the optimal energizing time suitable for No. 5 on the label 16, it can be handled as a non-defective product. This means that it is not necessary to control the resistance value of the heating coil at ± 3% (that is, the problem of the accuracy of the heating coil itself is reduced), which leads to a reduction in the cost of the heating coil. Things.

In addition, when the conventional energizing time and the energizing time according to the present invention are compared for the same type, the energizing time obtained by the present invention is shorter by 3 to 9 (sec) (see the fusion welding in FIG. 3). Joints A1 to A3). In other words, the energization time obtained according to the present invention is an optimal energization time for the heating coil 2, so that the loss of the energization time at the construction site is less than that of the conventional energization with a sufficient time. Become.

[0025]

According to the method for manufacturing a fusion spliced joint with a bar code label according to the first aspect of the present invention, a heating coil is provided on the inner peripheral side of the tubular joint body, and the heating coil is provided on the outer peripheral side. A fusion joint having a structure provided with electrodes connected to both ends is formed by injection molding.After that, the resistance value of the heating coil is measured, and the energizing time to the heating coil is determined based on the measured resistance value. The label is printed, and the calculated energizing time is printed as barcode information, and the label is attached to the manufactured fusion joint. According to a second aspect of the present invention, there is provided a bar code label printer, comprising: a measuring means for measuring a resistance value of a heating coil provided on an inner peripheral surface side of the fusion joint; and a resistance value measured by the measuring means. And a printing unit that converts the energization time calculated by the calculation unit into barcode information and prints the barcode information on a label. That is, since the energization time can be set based on the actual resistance value of the heating coil provided on the inner peripheral surface of the fusion joint, it is not necessary to manage the resistance value of the heating coil within a severe error range. In addition, the cost can be reduced, and the fusion spliced joint that has been conventionally determined as a defective product can be treated as a good product, so that the product yield can be improved. In addition, since the optimal energizing time can be set for each fusion joint, the energizing time at the construction site can be reduced, that is, It can be shortened.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a forming step of a fusion joint.

FIG. 2 is a block diagram showing a bar code label printer device used in a label producing step of producing a bar code label to be attached to a fusion spliced joint after molding.

FIG. 3 is a chart showing measured resistance values of five kinds of fusion joints of the same type and energization time obtained from the measured resistance values in comparison with a conventional charging time.

[Explanation of symbols]

 An, A1 to A5 Fusion joint 2 Heating coil 11 Resistance measuring device 12 Barcode creation unit 13 Energization time calculation unit 14 Data input unit 15 Label printer 16 Label

Claims (2)

[Claims] 1. A fusion joint having a structure in which a heating coil is provided on an inner peripheral surface side of a tubular joint body and electrode terminals connected to both ends of the heating coil are provided on an outer peripheral surface side by injection molding. Molding, and thereafter, while measuring the resistance value of the heating coil, calculating the energizing time to the heating coil based on the measured resistance value, and printing the label printed with the calculated energizing time as barcode information. A method for producing a fusion joint with a bar code label, wherein the fusion joint is attached to the fusion joint. 2. A measuring means for measuring a resistance value of a heating coil provided on an inner peripheral surface side of a fusion joint, and calculating an energizing time to the heating coil based on the resistance value measured by the measuring means. A bar code label printer device, comprising: a calculating unit that converts the energization time calculated by the calculating unit into bar code information and prints the bar code information on a label.