COF Testing Standards and Measures

COF testing measures the convenience with which two surfaces in contacts can slide through each other where there are two different values ​​related to friction coefficients - static and kinetic. Static friction applies to the style needed to initialize the movement between two surfaces and kinetic friction is resistance to slid after the surface in relative movement.

Because the cleanliness of the substrate is very important to collect reliable data, the right steps must be addressed before testing and being taken to when testing ensures freedom from dirt, oil and other contaminants that can affect test results.

ASTM D1894 is the main COF testing standard and used by many industries whose needs are very varied.

Friction test coefficient

New equipment in our laboratory will help food manufacturers evaluate the characteristics of friction from their food and beverage packaging, which is very relevant to the use and handling of packages.

The friction coefficient (COF), or slip resistance, is a significant problem in the world of packaging and is an important property of all the materials running on high-speed printing and packaging lines. COF is routinely determined in materials such as cartet and plastic film containers. Understanding and controlling COF packaging materials provides the processor and packaging the ability to optimize performance and avoid problems in forming, filling, transporting, and even storing packages.

Cologne containers that show high COF will tend to resist sliding in the load unit, while low coefficients can cause potential problems, with packages slipping from the load. For plastic films, low COF values ​​may be conducive to the speed of fast charging lines, while high coefficients may be the cause of abrasion, blisters and jammed films on the phone.

COF Effects in the Packaging Industry

The packaging film "friction coefficient" (COF) provides a relative indication of friction characteristics. Control the COF provides the processor of the ability to optimize performance and avoid problems in forming, transportation, and storage packages.

In the HFFS system (form horizontal fill and seal), too much friction side sealant film can cause drilling or jamming films when passing the metal plate.

In the VFFS system (Form Vertical Fill and Seal), too much friction from the side of the film sealant can cause poor film feedback on a metal-forming collar, the size of the package is inconsistent, and screaming. In both systems, too much friction can cause lateral slips that lead to bad seals (leakers).

Too a little friction outside can cause the package to slip or fall from the conveyor belt tend. Too much friction outside can slow down the shipping launch package down, or too a little friction outside can produce packages that glide from the stack or palette.

You can see that various applications require different fictional properties. Therefore, the coefficient of friction or COF testing is very important and used for process control to ensure consistent production of packaging types.

Establishing Values of a COF Testing Machine

The COF testing machine assists to establish two values, namely static friction and kinetic friction. Static power may be the determination in the power needed to begin the motion. Kinetic power will be the determination of the resistance against motions. There are lots of elements that contribute to generating inaccurate test outcomes. COF or Coefficient of Friction Testing is made use of to decide the frictional force involving two components. COF Testing is carried out on several different components like plastic and polymers, lubricants, Ceramic tiles, and so forth.

Following Coefficient of Friction Testing, worth varies based on the test materials. Typically; if CoF Worth is decrease, the friction is said to extremely much less to none amongst the two test materials and vice versa.

Friction tester is often a sort of testing gear which is utilized to measure the coefficient of friction (COF) for materials. Essentially, you'll find two kinds of coefficients: static coefficient of friction and kinetic coefficient of friction. Coefficient of friction testing is broadly valued for its vital role inside the processes of production, transportation and advertising and marketing.

COF Testing Machine

Coefficient of Friction Tester is applicable to the determination of static and kinetic coefficient of the friction of plastic films, sheets, rubber, paper, PP woven bags, fabric style, metal-plastic composite strips/belts for communication cable, conveyor belts, wood and coatings.

Peel Tester

Peel Tester can be utilized to test coefficient of static and kinetic friction of plastic films, sheets, foils, paper, cardboard, woven bags, fabric (fabric style test), metal-plastic composite strip/belt for communication cable, convey belt and textile, as well as peel strength test of adhesive laminated items, health-related adhesive bandage, release paper and protection films.

Inclined Surface Coefficient Of Friction Tester

Peel Tester is often employed to test coefficient of static and kinetic friction of plastic films, sheets, foils, paper, cardboard, woven bags, fabric (fabric style test), metal-plastic composite strip/belt for communication cable, convey belt and textile, also as peel strength test of adhesive laminated merchandise, medical adhesive bandage, release paper and protection films.

COF Worth in a COF Testing machine proves to be really important in plastic polymer manufacturing industries. Co-efficient of Friction tells us about the force with which two components glide by means of each other. If COF value is higher, typical complications observed are jamming or dragging of polymers inside the metal rollers. There's also a possibility of damaged goods and slower production. This in turn impacts the company’s bottom line negatively. On the other side, if COF value is low, prevalent issues observed are excessive friction which outcomes poor film feeding. This from time to time creates unpleasant squeaking noise. Inadequate friction also causes films to slip off the conveyor belt. Each the scenarios are usually not healthy for business inside the extended run. As a result, it becomes very vital for any enterprise to come up with decent COF value in R&D labs, which can be standardized through the manufacturing units.

 

COF Testing Machine of Frictional Forces

Coefficient of friction, the ratio of your frictional force resisting the motion of two surfaces to get in touch with towards the regular force pressing the two surfaces with each other.

The coefficient of friction has distinctive values for static friction and kinetic friction. In static friction, the frictional force resists force that may be applied to an object, as well as the object remains at rest till the force of static friction is overcome. In kinetic friction, the frictional force resists the motion of an object. For the case of a brick sliding on a clean wooden table, the coefficient of kinetic friction is about 0.5, which implies that a force equal to half the weight on the bricks is expected simply to overcome friction in maintaining the bricks moving along at a continuous speed, as well as the coefficient of static friction is about 0.6. The frictional force itself is directed oppositely towards the motion of the object.

Measuring the coefficient of friction

You'll find two forms of machines that may measure static COF -- permanent laboratory models and transportable field models which can be generally known as pull meters.

Probably the most typical process of measuring slip resistance utilizes a 50-pound weight placed flat on a Neolite shoe heel, that is then placed flat around the stone surface becoming tested. The heel-and-weight assembly is pulled across the stone having a spring or electronic scale. The maximum level of force (pounds) necessary to begin the assembly in motion is recorded. This measurement is divided by the weight (50 pounds) and yields the coefficient of friction worth.

Measurement of Slip Resistance

Tests to measure slip resistance had been created mainly for man-made supplies, together with the earliest in the 1940s, when Sidney James carried out experiments to price floor polishes along with other floor upkeep chemical compounds for Underwriters Laboratories. From these experiments came the COF testing machine James Machine (ASTM D-2047) as well as the 0.five static coefficient of friction because of the threshold of security for standard ambulation. In contrast to other test solutions, the James Machine can only be applied within a laboratory for testing smooth, dry surfaces, and test benefits can't be when compared with these of other test strategies.

The two most typical tests for measuring the static coefficient of friction are the COF testing machine C-1028 and D-2047. The solutions and final results of those two tests are extremely distinct and can't be compared. D-2047 makes use of the James Machine inside a controlled laboratory atmosphere that measures on dry, smooth surfaces and can't be employed within the field on current flooring surfaces. Due to the consistency in the testing process of your James Machine, it can be deemed to supply one of the most precise and trustworthy measurements of SCOF for smooth, dry surfaces. The COF testing machine C-1028 is really a transportable field test process that makes use of a horizontal pull meter. It might be utilized on wet or dry too as smooth or textured flooring surfaces. Due to the environmental variables related to tests utilizing transportable pull meters, the outcomes are inconsistent from the surface to surface, along with the reliability is low.

You'll find transportable slip meters in the marketplace which claim to measure the static COF. When buying slip meters, be certain they comply with all the ASTM needs for the applicable test process.

COF Testing Machine Common Uses

The coefficient of friction is actually a house vital for the optimum processing and handling of packaging from filling operations by way of towards the customer. COF is defined because the force essential to move 1 surface more than one more, divided by the total force applied typically to these surfaces. The values are among zero and one particular and are dimensionless. You can find two typical standard COF tester machines - sliding plane and incline plane.

Why does it matter? When the static COF is also higher, complications with the stacking and unstacking of cartons, boxes, and sacks will take place. Versatile films might bind when sliding onto filling collars. If static COF is as well low, difficulties in keeping stability in stacks could outcome, at the same time as difficulty pulling components via automatic processing machinery.

If kinetic COF is as well high, this could result in hang-ups along packaging lines, undue folds, erratic net tensions, and buildup of static electrical energy. When the kinetic COF is also low, guide rolls may possibly not rotate, tracking along the production line becomes irregular, internet tensions once more may well be erratic, along with the material will run eccentrically.

Acquiring the COF correct by way of COF the testing machine is largely a method of qualifying a packaging item and after that supplying this solution at a constant COF specification primarily based on an offered instrument and testing procedures. Be conscious that diverse COF testing machines and procedures have a poor correlation.

Most Commonly Used COF Testing Machines

C620H Friction / Peel Tester

C620H Friction / Peel Tester is usually applied to test the coefficient of static and kinetic friction of plastic films, sheets, foils, paper, cardboard, woven bags, fabric (fabric style test), metal-plastic composite strip/belt for communication cable, convey belt and textile, also as peel strength test of adhesive laminated merchandise, healthcare adhesive bandage, release paper and protection films.

MXD-02 Coefficient of Friction Tester

MXD-02 Coefficient of Friction Tester is applicable for the determination of static and kinetic coefficient of the friction of plastic films, sheets, rubber, paper, PP woven bags, fabric style, metal-plastic composite strips/belts for communication cable, conveyor belts, wood, and coatings.

FPT-F1 Friction/ Peel Tester

FPT-F1 Friction/Peel Tester could be utilized to measure the coefficient of static and kinetic friction of plastic films, sheets, foils, paper, cardboard, PP woven bags, fabric( fabric style test), metal-plastic composite strip/belt for communication cable, convey belt and textiles, too as peel strength test of adhesive laminated items, healthcare adhesive bandage, release paper, protection films, and so forth.

COF-P01 Inclined Surface Coefficient of Friction Tester

COF-P01 Inclined Surface Coefficient of Friction Tester could be employed for the coefficient of friction tests for paper, cardboard, plastic films, sheets, and conveyor belt and so forth. By the smoothness measurement, it could be utilized to adjust the open easiness of pouches, packaging speed of packing machine along with other excellent indexes so as to meet the application demands.

Different Forces of a COF Testing Machine

COF (Coefficient of Friction) is really a worth that represents the connection involving the force of friction and also the regular force amongst two objects. Though this could sound confusing, it can be a crucial worth for providers that manufacture lawn and garden bags and plastic bags for mulch. COF is significant for each mailer and all lawn and garden bags which might be palletized for transport and show.

All through day-to-day life, friction happens. This unseen force either enables or hinders the movement of two surfaces that come into contact. By controlling COF, businesses that manufacture and sell plastic bags for mulch, mailers, lawn, and garden purposes can optimize functionality and avoid difficulties precise to storage and transportation.

When excessive friction around the sealant’s side in the film happens to employ horizontal type fill and seal systems challenges with jamming or dragging through passing more than metal plates are typical. These damages goods and causes slower production, which impacts the company’s bottom line.

The COF Testing Machine

A COF testing machine also named a coefficient-of-friction (COF) tester, tends to make a measurement of a sheet-like substrate including paper, corrugated, plastic film, or paperboard which determines the angle of inclination at which one substrate affixed to a sled will start to slide/slip against the surface of an additional substrate of an equivalent material.

Measuring friction might be an essential aspect for a lot of industries, in particular for plastics and packaging. Friction could be characterized by static friction and kinetic friction. Static friction of plastic is present when two objects are in speak to but not sliding across every other. Kinetic friction is often resistance friction that's present through sliding motion involving two objects. The coefficient of friction is dependent around the surface situations of each supply that are in contact.

Some COF testing machines like ASTM D1894 and ISO 8295 cover the testing strategies to decide the coefficient of plastic components. Testing includes pulling a weight having a plastic specimen in between the weight and also the ground. The force essential to perform so might be measured along with a coefficient of friction is then determined.

ASTM D1894

Making use of this test, the static coefficient of friction, and also the kinetic coefficient of friction in the test material is often measured. ASTM D1894 is typically utilized for plastic sheeting but you'll be able to adapt it for almost any item or material (instance: Friction of sneakers on anti-slip paint). The test utilizes a regular universal COF testing machine, low force load cell, along with a COF apparatus described inside the specification (ADMET element quantity FS-CFT). The initial force to move the sled is utilized to calculate the static COF, plus the typical force when the sled is moving is employed to calculate the kinetic COF