Leneta Form 7B sagging and levelling test cardboard 194 x 289 mm 250 sheets/box

Form 7B

SAG levelling test jam

Leneta Form 7B sagging and leveling Charts, as the name suggests, is a Opacity Chart used for sagging and leveling test tests, the surface shape color is white for the upper part, black for the middle part, and white for the lower part.The specifications for the Form 7B sagging and leveling test jams are:194 x 289 mm per ASTM standard.

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The use of Leneta 7B squeegee paper on leveling sagging

In the anti-sagging test, an anti-sagging device and a standard coating board were used, and Form 7B squeegee paper was used for light-colored paints and Form WB squeegee paper was used for dark-colored paints

On the other hand, on leveling, the Form WB is used for light paints, and the Form 7B is used for dark paints.

>>> details are provided in the following translations<<<

Leneta Leveling Test (see ASTM D 4062)

A. Equipment

1.Leneta leveler, product number LTB-2;

2. Coating leveling standard, product number LS-2;

3. Leveling test coating plate, product number DP-2;

4. Scraping paper Form WB for light paint, Form 7B scraping paper for dark paint;

5. Padding, Form CP-2

6. Pre-cutting equipment, see page 36 of the catalog;

B. Preparation of paints

1. Stir completely and adjust the temperature to 23°C (73°F);

2. Filter and adjust viscosity if necessary;

3. Use one of the attached Pre-Shear Method descriptions to perform pre-cutting, and then test immediately.

C. Painting

1. Place the pad paper on the coating board.

2. Place the squeegee paper next to the left guide edge of the coating plate.

3. The leveler is placed at the top of the cardboard, and its long arm is next to the left guide side and towards the operator.

4. Place 8-10 ml of pre-cut paint on the tip of the leveler and apply quickly and evenly at a rate of approximately 60 cm/s (2 ft/s).

5. At 23°C (73°F), keep horizontal to dry.

D. Ratings

1. After drying, cut out a 3 x 5 inch (75 x 125 mm) piece of cardboard with stripes parallel to the long side.

2. Compare it with a Leneta coated leveling standard under suitable oblique light.

3. The matching standard number is the coating leveling value of Leneta. The high level of the rating is 10 and the lowest level is 0.

E. Practical Significance of Rating Values

This is based on subjective judgment. The following table is based on the consensus of an experienced laboratory collective:

Leneta Leveling Test (see ASTM D 4062)

Leneta Anti-Sagging Device Test Method (see ASTM D4400)

A. Instruments

1. Anti-sagging device 2. Adjustable straight edge, product number SE-1 3. Standard board for coating, product number DP-1 4. Scraping paper Form 7B for coating, used for light-colored paint. The white scratch paper Form WB is used for dark coatings. 5. Pad, Product No. CP-1 6. Pre-cut the equipment with a bottom-range anti-sagging, and the surface of the flat glass is better.

B. Preparation of paints

1. Stir evenly and adjust the temperature to 23°C (73.5°F) 2. Use one of the attached Pre-Shear Method descriptions to perform pre-shear, and then test immediately.

C. Painting

1. Place the straightener in the appropriate position of the standard plate for coating. 2. Place the test squeegee paper on the coating plate and clamp it. 3. Place the drogger on the scraper near the clamp, with the open-facing side of the sager facing the operator and its shoulders close to the straight-edged device. Place the pad paper. 4. Place an appropriate amount (8-10 ml) of pre-cut paint in front of the blade and apply at a constant speed of approximately 6 inches/second (150 mm/s). 5. Quickly and steadily place it vertically, so that the stripe is horizontal like a ladder erected, with the left (thinnest stripe) on it, and let it dry in this state.

D. Coating Grade

1. Match the coated stripes with the grooves on the anti-sagging. 2. Ignore the edges of the front and trail and look 150 mm (5-1/2 inches) in the center of the stripe, which is equivalent to the black area of the Form 7B. 3. The lowest (thickest) stripe that does not touch the stripe below is the logo stripe, and the corresponding number of grooves is the anti-sag index of the paint. 4. To get a more accurate anti-sag index, you need to add the number of grooves to the value of the increment and non-integration coefficient between the gaps (the coefficient that blends into the stripes below).

The non-integration coefficient can be estimated from the table below:

E. Rating Description

       This is empirical or experimental, and highly subjective. It is important to emphasize that the sag resistance index is not a wet film thickness value. It is the gap of the indicated groove in mils, and as a result, the indicator fringe is about twice the thickness of the wet film. Neither the sag resistance index nor its corresponding approximate wet film thickness should be construed as a specific thickness in practice. It is a comparative tool, and it can only be achieved based on practical experience. Once the coating has shown good sag resistance in practice, the sag index can be measured and the sagging value of the specific formulation can therefore be controlled.

       The anti-sag index may vary between different products. For example, latex paints generally have higher index values than solvent-based paints. The following judgment on sagging performance is based on observations of a range of general purpose high-gloss alkyd base coats and is for reference only. Do not take this as final.

 The above indices cover the range of standard anti-sagging, but many coatings need to be tested for lower or higher index values. This gives rise to three other anti-sagging devices in the low, medium, and high index ranges. In this way, the measured value of the anti-sag index is extended to 1~60.

The choice of scraping paper is related to the coating process

Different paint and ink formulations require the squeegee paper to have different solvent resistance, strong or weak.

Different types of resins should be used with inadequate solvents. The polarity of a solvent dictates that its organic components can be activated more and less.

Features

It has very good resistance to solvents

High repeatability of color and luster in different batches

The surface is smooth and without any texture

Super adhesion and extensibility, even when exposed to high humidity, it will not deform and curl

Scraping paper related configurations [sold separately]

Coating rods provide an economical and convenient way to prepare coatings with uniform filmness

Simple to use and easy to clean

Hold the squeegee paper firmly in place during application

Helps to achieve even results

Stepssudden

Follow the coating steps to evenly apply the paint to the squeegee paper. After the coating film is fully dried by air, the instrument is used for objective evaluation.

The hiding force value can be measured and displayed automatically in less than 1 second. The same procedure can be applied to the detection of the coverage of transparent films and plastic products.

LENTA Concealment Paper Subdivision Type

Covering power scraping paper: Measure the hiding power with an instrument

Permeation Scraping Paper: Used to assess the consistency of color and gloss on a voided surface

Visual assessment of hiding power:

- Comparison/coating rate squeegee paper

- Black and white grid/coating rate scraping paper

Brush squeegee paper is used for informal painting

Dedicated test squeegee sheets for sag and leveling tests.

Packing list：Encasement x1, Opacity Chart x1

[Note]Because the manufacturer's packaging may be updated or upgraded, the detailed packaging list shall be subject to the latest standard configuration of the manufacturer.