הַקדָמָה
ISO (הארגון הבינלאומי לתקינה) היא הפדרציה העולמית של גופי התקנים הלאומיים (גופים חברי ISO). פיתוח תקנים בינלאומיים מתבצע בדרך כלל באמצעות ועדות טכניות של ISO. Each member group interested in a subject on which a technical committee has been established has the right to be represented on the Committee. International, governmental and non-governmental organizations in liaison with ISO are also involved in this work. ISO עובד בשיתוף פעולה הדוק עם הנציבות האלקטרוטכנית הבינלאומית (חברת החשמל) בכל הקשור לתקינה חשמלית.

טיוטת הסטנדרטים הבינלאומיים שאומצו על ידי הוועדה הטכנית יופצו לגופים החברים להצבעה. Publication as an international standard requires approval by a vote of at least 75% of the member body.

The international standard ISO 8780-6 was developed by the ISO/TC 35 Technical Committee on Paints and Varnishes.

ISO 8780 consists of the following sections under the general heading Pigments and Increments – Dispersion Methods for assessing dispersion properties:

— חֵלֶק 1: מבוא

— חֵלֶק 2: Dispersion using oscillating motors

— חֵלֶק 3: Dispersion using high speed impeller mill

— חֵלֶק 4: Dispersion using a bead mill

— חֵלֶק 5: Using an automatic grinder for dispersion

— חֵלֶק 6: Dispersion using a three-roll grinder

Appendix A forms an integral part of this part of ISO 8780.

ISO 8780-6-1990 “שיטות פיזור להערכת תכונות פיזור של פיגמנטים וחומרי מילוי — חֵלֶק 6: פיזור באמצעות טחנת שלוש גלילים”

1 היקף היישום
החלק הזה של ISO 8780 specifies a method for dispersing pigments and increments using a three-roll grinder. The results allow conclusions to be drawn about the behavior of the test product when dispersed using the corresponding production machine. החלק הזה של ISO 8780 is used in conjunction with the evaluation methods described in ISO 8781, using an agreed upon high viscosity adhesive system that does not contain volatile substances. It should be read in conjunction with ISO 8780-1.

This method is limited to high viscosity abrasives. In order to improve the precision of the method, it is suggested that the dispersion procedure of the test pigment and the agreed reference pigment should be carried out at the same temperature.

The results obtained are not suitable for comparison with the dispersion results obtained using other dispersion methods.

הערה 1 The advantages of the three-high mill described in this section of ISO 8780 are ease of handling the equipment, the ability to prepare sufficient quantities of abrasive for extensive evaluation procedures, ease of cleaning and associated probable results with the results of the production machinery. Unlike dispersion devices used for low-viscosity abrasive formulations, three-roll grinders such as those described in this part of ISO 8780 allow processing of a variety of high-viscosity abrasive formulations. Because of this greater flexibility, it is not necessary to precisely specify the appropriate color paste formula.

2 Normative reference files
The following standards contain provisions which, by reference, מהווים את ההוראות של חלק זה של ISO 8780. At the time of publication, the version shown is valid. All standards are subject to revision and parties to an agreement based on this part of ISO 8780 are encouraged to investigate the possibility of applying the latest versions of the following standards. IEC and ISO members maintain a register of international standards currently in force.

ISO 787-24:1985, General methods of test for pigments and increments – חֵלֶק 24: Determination of the relative tinting force of coloured pigments and the relative scattering force of white pigments – photometric method.

ISO 842:1984, Raw Materials for paints and varnishes – דְגִימָה.

ISO 1524:1983 צבעים ולכות – Determination of grinding fineness.

ISO 8780-1:1990, pigments and increments — Dispersion methods for the evaluation of dispersion properties — חֵלֶק 1: מבוא.

ISO 8781-1:1990, pigments and increments – Methods for assessing dispersion properties – חֵלֶק 1: Assessment against changes in the tint strength of coloured pigments.

ISO 8781-2:1990, pigments and increments – Method for assessing dispersion properties – חֵלֶק 2: Assessment against changes in grinding fineness.

ISO 8781-3:1990, pigments and increments – Methods for assessing dispersion properties – חֵלֶק 3: Assessment from changes in gloss.

רק מדור המידע הסטנדרטי הוא ציבורי. לצפייה בתוכן המלא, אתה צריך לרכוש את התקן דרך הערוצים הרשמיים.