Who Invented Cobb Test?
The Strong-Cobb is a unit with a very unusual name for a unit of measurement since it is named after the company, Strong-Cobb Inc. The inventor of the hardness tester was Robert Albrecht, the plant engineer for the Strong-Cobb Company. He sold the patent to the company for $1.00.
What is Cobb test?
Cobb test (sized papers and paperboards)
The Cobb test determines the amount of water absorbed into the surface by a sized (non-bibulous) paper, paperboard, and corrugated fibreboard paper or paperboard sample in a set period of time, usually 60 or 180 seconds (Cobb60 or Cobb180). Water absorbency is quoted in g/m2.
Is standard for Cobb test?
The Cobb Test is carried out according to the following standards: ISO 535, EN 20535 and TAPPI T 441.
What is the purpose of Cobb sizing tester?
The Gurley-Cobb sizing test can be used to test absorption or resistance to absorption of water, oil and other liquids. This procedure determines the quantity of water absorbed by a sample of paper or other sheet material in a specified time and under standardized conditions.
How is Cobb test calculated?
To determine the Cobb Value, subtract the weight of the sample before testing from the weight of the sample after testing.
What is Cobb value?
The Cobb value provides information about the water absorption capacity of cartonboard samples. The Cobb test determines the amount of water that is taken up by a defined area of cartonboard through one-sided contact with water, within a certain amount of time.
What is a good Cobb value?
Cobb values for liner grades are typically specified as being Target 100g/m2 up to a Maximum of 150g/m2, which means they are moderately chemically sized, and this applies across a broad range of paper weights possibly from 100g/m2–440g/m2.
Is code for tests on steel?
ISO 377:1997, Steel and steel products – Location and preparation of samples and test pieces for mechanical testing.
How can Cobb value be reduced in paper?
Surface sizing with mixture of oxidized starch and AKD, at the ratio of 10 to 1, is the best method for reducing Cobb value of the papers along with preserving paper strength, which is used now in the industry for producing fluting and test-liner papers.
What is Cobb in paper industry?
Cobb value or water absorptiveness is counted by a 1 sq. meter sample of paper or corrugated sheet to measure the mass of water absorbed in a given time. This value helps to maintain the quality of the paper used in the packaging industry.
How do you find the Cobb value of a paper?
Take the sample out carefully and use the roller to extract the extra amount of water. Weigh the sample. Now subtract the dry weight from the wet weight, the value you have is the Cobb value of Kraft paper. This the amount of water the sample absorbed in a defined time period.
What is a Cobb Stage 2?
The COBB Stage 2 Power Package is a simple bolt-on and tuning solution for your 2011-2014 WRX Sedan!
What is kit value in paper?
The highest numbered solution (the most aggressive) that remains on the surface of the paper without causing failure is reported as the ‘kit rating’ (maximum 12).
What is burst strength of paper?
Bursting strength or burst resistance is a property of a plastic, paper or corrugated board -used in packaging- and is general a guide to the strenght of that plastic, paper or corrugated board. With a burst tester you define the pressure needed to burst a plastic, paper or paperboard.
How do you calculate test efficiency?
Test efficiency = (Total number of defects found in unit+integration+system) / (Total number of defects found in unit+integration+system+User acceptance testing)*100.
How is water absorption measured?
For the water absorption test, the specimens are dried in an oven for a specified time and temperature and then placed in a desiccator to cool. Immediately upon cooling the specimens are weighed. The material is then emerged in water at agreed upon conditions, often 23°C for 24 hours or until equilibrium.
What is burst strength?
Burst strength is the strength of material in pounds per square inch. Burst strength can be used to monitor the quality of cold chain packaging. Often called the Mullen Burst Test, burst strength is an industry standard that measures the amount of force required to burst corrugated boxes and flexible packaging.
How do you test absorbency?
The absorbency time test determines the suitability of a fabric for a particular use, as in the case of gauze or toweling. A drop of water is allowed to fall from a fixed height onto the taut surface of a test specimen. The time required for the water drop to disappear is measured and recorded as wetting time.
Why is it called Cobb?
Cobb salad received its name from a restaurant owner named Robert Cobb. After a long night of service, Chef Cobb was tired and hungry at the Brown Derby in Hollywood, CA. He threw together a bunch of leftover ingredients into a bowl with lettuce and tossed them together with French dressing.
What is the base of Cobb?
Cobb salad
| Type | Salad |
|---|---|
| Region or state | California |
| Created by | Hollywood Brown Derby restaurant |
| Main ingredients | Salad greens (iceberg lettuce, watercress, endive, Romaine lettuce), tomatoes, bacon, chicken breast, hard-boiled eggs, blue cheese, red-wine vinaigrette. |
| Media: Cobb salad |
What is Cobb in food?
ˈkäb- : a tossed salad made typically with chopped chicken or turkey, tomatoes, bacon, hard-boiled eggs, blue cheese, and lettuce and dressed with a vinaigrette.
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