Adhesion Testing / Adhesives Testing

Adhesion is the bond strength measurement of a coating to a substrate. When an adhesive is bonded to an item or surface numerous physical, mechanical and chemical forces come into play, which may have an effect on each other. These need to be tested before a product can be used.

Typical test measurements include

²  180 degree and 90 degree peel tests

²  Lap shear tests for evaluating the shear strength of adhesives for bonding two surfaces together and welds such as metal and plastic welds

²  Tensile strength

²  Seal strength, peel strength and adhesion strength tests to determine adhesion strength of flexible plastic packaging

²  and so on

Some of adhesive standards developed by ASTM

²  D1002 - 10 Standard Test Method for Apparent Shear Strength of Single-Lap-Joint Adhesively Bonded Metal Specimens by Tension Loading (Metal-to-Metal)

²  D2095 - 96(2008) Standard Test Method for Tensile Strength of Adhesives by Means of Bar and Rod Specimens

²  D3165 - 07 Standard Test Method for Strength Properties of Adhesives in Shear by Tension Loading of Single-Lap-Joint Laminated Assemblies

²  D2339 - 98(2011)Standard Test Method for Strength Properties of Adhesives in Two-Ply Wood Construction in Shear by Tension Loading

²  and so on, please refer to http://www.astm.org/Standards/adhesive-standards.html

Adhesion testing can be carried out on a range force and material testing systems which will depend on your application needs, force capacity, and the data you require from your test results. We have a wide variety of force gages, motorized force test stands, and material testing systems and software to meet your application needs.

u  NLW-20 Adhesive Tensile & Shear Tester

This Instrument is professionally applicable to the determination of tensile, shearing, and pulling properties of various adhesives, which conforms to various ASTM standards ASTM D1002, ASTM D2095, ASTM D3165, and ASTM D2339.

u  CZY-G Initial Adhesive Tester

This instrument is used to test the initial adhesion property of adhesive tapes. It is based on falling ball method and the initial adhesion property of adhesive taps could be obtained by observing adhesive effect occurred immediately after rolling ball and adhesive specimen come into contact.

This Instrument conforms to JIS Z0237.

u  CZY-6S Adhesive tapes retention adhesive tester

This Instrument is used to measure the retention adhesion properties of adhesive tapes in a relative long time. The test plate with adhesive specimen is vertically hanged on the stand and its bottom is attached with a standard weight. The retention adhesive property could be obtained by measuring the displacement of specimen on vertical test plate or the time to failure at such load.

The Instrument has 6 work stations, which highly improved the efficiency of the testing. It is controlled by computer and timing is automatic finished.

u  There is another instrument can be used to test the tensile strength and peel strength of adhesives, Labthink XLW Tensiletester. This is an universal testing machine, besides tensile test and peel test, it can also used for tear test, seal strength test for hundred kinds of materials.

For more information about adhesive testing/adhesion testing, please contact us via trade5@labthink.cn or visit our official website www.labthinkinternational.com.cn.

Quality Concerns of Doypacks

Packaging is “a silent seller” of the goods. There are more and more producers who think about the design of their product for the customer to choose it among other products in supermarket.

A bag with a stable bottom – doy-pack – is a beneficial positioning of product and it is very easy-to-use for the customer.

Doypacks also go by the name of stand-up pouches. they obtain more and more customers and manufacturers favorite, because they are convenient:

• reclosable by adding a zipper or spout
• easy to be opened, by adding a tear notch or perforation
• display your products and maximize shelf space
• shape it in any way without high additional costs
• Because of small weight and capacity the costs for transportation and storing are less.

A bag with a stable bottom consists of two-, three- or four- layered materials whose thickness may be different (from 70 to 120 mm).
Inner layer is made of polyethylene and it provides the resistance to the content of the package and it is also thermo-welding layer. Outer layer is made of polypropylene ( BOPP) or lavsan( PET), it is very convenient for deep or flexographic printing. Aluminum foil is used for the medium layer .This layer is high-barrier, it does not pass light and moisture inside what is very important for organic coffee, spices, sauces, juices, etc.

Based on the widely usages and constituent of Doypacks, quality control of doypacks should be included but not limited to:

• Thickness of each layer plastic film and laminated films
• Heat Seal property of inner layer material films
• Barrier property of medium layer for Moisture, oxygen and other gases
• Ink Abrasion Property on printing layer
• Peel strength among each layer
• Lock and open force of spout if any
• Package integrity
• Coefficient of Friction for piling up and filling

In some way, quality control is not to increase the product cost but decrease the production cost. Here I want to show you a diagram about Optimum Packaging Cost:

From this chart, you will we should keep our product in an Optimum packaging system, which needs us control the product quality in some extent. But how to measure and make sure the proper properties of doypacks, I am sure this is confusing many manfacurers of products and doypacks. Do you there is a company named LabthinkInstruments Co.,Ltd, which professionally R&D and manufacture the flexible packaging testing equipment. They can give you all the solutions for your doypack. to contact them, you can write an email to trade5@labthink.cn or visit the website and leave a message to them about your requirement.

Bond Strength Tester (ASTM D882)

Bond strength generally involves determining the stress required to rupture a bond formed by an adhesive between two metal blocks. Often the test involves the measurement of the shear and flexural bond strength of a bonding agent or a comparison of bonding agents under varying environmental conditions.

Bond strength testing can be carried out on a range of Labthink Instruments materials testing machines.

It can be used for 180 degree peel test, tensile test for materials.
 
For More info about Bond strength Tester, please contact yarina Gao at Labthink Instruments Co., Ltd

Tensile Tester - Special for Materials with Max Load 500N and Accuracy 0.5% of reading value

XLW (EC) Auto Tensile Tester can be used to measure tensile, peeling, deformation, tearing, heat sealing, adhesive, puncture force, opening force and low speed unwrapping force as well as other performance of plastic films, composite materials, soft package materials, plastic flexible tube, adhesives, adhesive tape, label stickers, medical plasters, release paper, protection films, combined caps, aluminum foil, diaphragm, back sheets, non-woven fabrics, rubber, and paper, and etc.

Technical Specifications

Items	Specifications
Test Range	500N (standard) 50N (optional)
Accuracy	Better than 0.5% of reading value
Test Speed	Forward 50, 100, 150, 200, 250, 300, 500 mm/min Backward 50, 100, 150, 200, 250, 300, 500 mm/min
Number of Specimens	1
Specimen Width	30 mm (Standard Grip)
	50 mm (Optional Grip)
Clamping Way	Pneumatic
Gas Supply Pressure	0.5 MPa ~ 0.7 MPa
Stroke	950 mm
Instrument Size	450mm(L) x 450mm(W) x 1410mm(H)

This Tensile Tester is equipped with more than 100 grips for tests of more than 1000 materials. And customization is also available for special material tests. Examples of instrument applications:

• Shearing Test
• Test of Tensile Strength and Elongation Rate
• Test of Tensile Strength at Break
• Tear Resistance Test
• Heatseal Strength Test
• 90 Degree Peel Test
• 180 Degree Peel Test
• Tensile Strength Test at Defined Elongation

Another Tensile Tester XLW(PC) is similar with with XLW(EC) Tensile Tester, but this tensile tester has a travel stroke up to 1000mm to meet client special requirements. 

Precise Thickness Tester for Paper and Plastic Films

Labthink thickness testers is based on mechanical contact method, which will provide clients with more precise testing results. Labthink thickness testers are applicable to the determination of thickness of:

• Plastic Films and Sheets

• Paper and Paper Board

• Foils and Silicon Wafers

• Metal Sheet

• Textiles and Non-woven Fabrics

• Solid Electrical Insulating Materials

• Test Method - Contacting Method 

• Test Range - 0~2mm, 0~6mm or 0~12mm

• Teat Resolution -- 0.1 μm

• Contact Area -- 50 mm² (film); 200 mm² (paper)

• Display the real-time data of maximum, minimum, average and standard deviation value for data analysis

According to clients' differential requirements, Labthink has three modles thickness tester, CHY-CA Thickness Tester, CHY-CB Thickness Tester and CHY-C2 Thickness Tester. 

Same Specifications of These three thickness tester:

CHY-CA Thickness Tester has the function of auto sampling mechanism. Automatic specimen feeding, specimen feeding interval, number of testing points and specimen feeding speed could be preset by the user.

CHY-CB Thickness Tester is an improved CHY-C2 Thickness Tester. Labthink Technical Department did a great improvement on CHY-C2 Thickness Tester. CHY-CB is more easy to operate. 

For more info, please contact Yarina Gao via trade5@labthink.cn