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Flexo-Printed Adhesive Floor Graphics Boom As Retail Businesses Open Their Doors

Posted By ASC, Thursday, September 24, 2020

Adhesive floor graphics have become must-haves for retailers as they slowly and tentatively get back on track following the devastation caused by the Covid-19 virus. There’s no end in sight yet for either the virus, or for the need to make sure that all the feet that come through their re-opening doors walk in the right direction, and adhere to the strict 6ft rule of social distancing.


This has resulted in a soaring increase in the demand on the flexography industry for adhesive directional and physical floor graphics which display the correct distancing between those standing in line to enter, or later to pay.


In answer to this demand, adhesive coating and laminations product manufacturer Flexcon has introduced a 3.4mil flexible opaque white vinyl as a printable substrate to water-based flexo inks and UV curing, and to ensure optimization for the printing, includes a 78lb Mando liner.
According to the company, the vinyl is durable and it’s removable adhesive allows for the vinyl to be removed and repositioned at any point up to 180 days after application. By attaching a suitable overlaminate, the vinyl can also meet non-slip performance industry standards of under UL410.

 

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Gentle Kenesiology Adhesive Tape Addresses Skin Irritation

Posted By ASC, Tuesday, September 22, 2020

Kenesiology adhesive tapes play a significant role in both sports and physiotherapy when it comes to treating pain and swelling, but for some users with very sensitive-skins, the consequences of using (and removing) the tape, have in some cases literally left their mark in the form of rashes or irritated areas, despite their using laex-free materials and dermatological hypo-allergic acrylic adhesives.

 

With this in mind, SpiderTech has introduced Gentle tapes, clinical-grade therapeutic tapes backed with a soft gel-like adhesive, in an attempt to lessen these reactions, which normally result from removing the tape, especially when it’s been used on areas where hair may have got caught by the adhesive.


According to the company, the adhesive used on the Gentle tapes’ has been designed to adhere to the skin smoothly and maintain grip without causing skin irritation for up to five days. It is also sweat and water resistant, and has been designed to copy the weight, thickness and elasticity of skin, in order to allow for mobility.

 

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Avoiding the Stresses of CTE Mismatches When Choosing Adhesives

Posted By ASC, Thursday, September 17, 2020

Boosted by the burgeoning switch-over from mechanical fasteners to adhesives in assemblies, adhesives manufacturers are coming up with more and more adhesives designed to meet the different needs of specific manufacturers. However, one problem is still raising its head, and that’s what happens when the coefficient of thermal expansions (CTE) of the adhesives and the substrate/s don’t match each other.


This can place thermo-mechanical stress on the joints when either the adhesive itself has a CTE which differs from that of a single substrate, or when two substrates are bonded that don’t have the same coefficient, as would be the case when bonding aluminum to glass, ceramic or glass to plastics, and rubbers to metals.


In the first scenario, the adhesive layer might well expand and contract at a different speed to that of the substrate even when the CTE difference is only slight, and in the second, CTE mismatches of different substrates can result in even more stress on the joints. Finding a solution is a problem in itself, because it involves some trade-offs. Solutions are available, but often bring about unwanted changes in other parts of the process.


Solving the mismatches may seem to involve no more than selecting an adhesive with as low a thermal expansion coefficient as possible, and, if necessary, reducing it even more by using a ceramic or specialty filler that has a negative CTE, which could lower the values considerably. However, there is a catch. Using fillers can increase the adhesive’s modulus resulting in it becoming stiffer or more rigid, and the same end result is likely when using ultra-low CTE adhesives.


Using rubber toughened adhesive systems to reduce stress on the joint is another option. These “flexibilized”adhesive systems offer a toughened cure, sometimes show relatively high lap shear strength, and have a tensile modulus which isn’t too high. Some also provide relatively high elongation values, and offer a higher thermal expansion coefficient. However here, too, accepting that when one side rises the other will drop, remains an important factor for consideration at the engineering design stages of adhesive product development or selection.

 

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Hot Melt Adhesives the Key to Agile Digital Manufacturing

Posted By ASC, Tuesday, September 15, 2020

Since the digital world entered the manufacturing one with a bang, bringing with it 3D printing and robotics, there’s been no slowing down. The focus is on flexibility, efficiency, and, above all, the speed of production, which has led to big changes in the materials, processes and adhesives used in production, as well as the way they are applied.


So far, hot melt adhesives, there for work from the time when the initial fused deposition modeling 3D printers clocked in for the first time, haven’t slowed down either. They now allow for production speeds of over 1,200 products per minute in certain assemblies, and are fitting in well in the robotics sector, where non-contact jetting of small dots of adhesives increases accuracy and boosts cycle speed (reaching up to 1,600 times a second) by simplifying the demands on the robot’s software program.


Among the areas in which hot melt is already taking the lead are the production of bezel-less devices, and contributing the necessary high quality bonding and sealing to the assembly of the more than 7,000 cells required by just one electric car, to ensure they withstand the number of recharges expected during the car’s lifespan.

 

As with most types of adhesives, a lot of changes have been made and new directions taken in the development of hot melts aimed at specialized solutions to specific manufacturing demands. This has led to the development of foamed and reactive hot melt adhesives to increase their performance still further. The foamed ones provide a soft and compliant material for excellent sealing and bonding of permanent assemblies, or for use as gaskets in products which are often opened and closed. Reactive ones, on the other hand, develop high levels of strength, heat resistance, and flexibility, by continuing to increase these qualities after the initial bond is formed, in reaction to the moisture in the air.


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Taking the Bubbles Out of Electric Component Potting

Posted By ASC, Thursday, September 10, 2020

With air bubbles one of the biggest threats to the effective potting and performance when used to protect electric components from environmental conditions such as vibration, moisture and humidity, ViscoTec Asia’s laboratory has pursued the most obvious direction in seeking a solution - excluding air during the potting process. To do so, it has tested the advantages of carrying out the potting process in a vacuum when potting compounds such as epoxy, silicone or polyurethane liquid resins, particularly when it involves the small and complex assemblies needed in electronics.


While the company acknowledges the complexity and demands involved in using a vacuum chamber and the necessary equipment do not necessarily make it suitable for every situation, it reports it has proved successful in certain cases.


After a case study testing the results of potting small 2.8mm holes in under 10 seconds with and without a vacuum in its new laboratories, the company reports that using a vacuum chamber resulted in meeting the 10 second time challenge and no cavities, while doing so without a vacuum took two to three times longer, and cavities were found in the cured material.

 

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High Bond Tapes and Adhesives for Less Visible Stiffeners

Posted By ASC, Wednesday, September 9, 2020

High bond tapes and structural adhesives are challenging liquid adhesives, spot and stitch welding, and mechanical fasteners for the role of main players when it comes to adhering stiffeners to panels in order to lower the amount of panel deflection and increase rigidity.


The double-sided foam tapes and structural adhesives’ challenge is based on the design freedom they provide in joining composites to metal; building using hard-to-bond plastics; and enabling the use of thinner and lighter materials. They also leave no (or very few) signs that they were even part of the process with their nearly invisible joints and smoother bond lines, an unblemished exposed side. They also require no refinishing, and no major clean-up afterwards as is the case with welding. Throughout the application both require very little surface preparation and are easy and fast to apply. They provide flexibility and joint expansion as well as holding power, have enhanced fatigue and corrosion resistance, and reduce noise and weight.


The tapes and structural adhesives are suitable for stiffener application in metal enclosures, transportation utility boxes and door panels, as well as a wide range of metalworking tasks including furniture, HVAC, drain pans, signage, and cabinet assemblies.

 


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New One-Part Sealant for Automotive Electronic Connectors

Posted By ASC, Wednesday, September 2, 2020

With protecting electronics from corrosion, humidity and media a major concern in automotive assembly, DELO has introduced a one-component sealant designed for sealing silver-coated pins in the connectors most commonly used in sensors and vehicle control units.


To optimize the sealant’s application, the company reports that the easily-dispensed adhesive with good flow properties also has a dual-cure light and humidity option, allowing for curing under high-intensity UV light in 10 to 20 seconds, as well as providing for shadowed areas which are not exposed to the light to be able to cure using the humidity in the air.


According to DELO the sealant remains flexible in a cured state, so allowing it to compensate for any different thermal expansions on the part of plastic housings and metal pins. It is also resistant to temperatures up to 150°C, and thermal shock tests showed it capable of keeping connectors tight through temperatures anywhere between that high point and -40°C.


The company reports that the sealant is able to bond with the passivation layer (often mercaptan) attached to the silver-coated pins in many instances to prevent tarnish and abrasion, which has sometimes proved difficult to bond. It is also able to bond well with regular housing materials like PBT and PA. Although not silicone-based, according to DELO the sealant has silicone-like properties, without the risk of outgassing and contamination of other processes sometimes incurred when using that polymer for sealing.

 

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Adhesive and Sealant DIY Sales Spike Globally During Lockdown

Posted By ASC, Tuesday, September 1, 2020

As people round the world battle to deal with Covid-19 lockdowns and a stay-at-home lifestyle, adhesives and sealants suitable for DIY projects and repairs in houses and gardens have taken their place as regulars in online shopping carts, and the demand for these products has spiked dramatically during the past few months.


The unprecedented growth in online sales of sealants and adhesives set new records for domestic orders for many online suppliers during the second quarter of 2020, starting with the early signs of summer’s arrival in the northern hemisphere as many DIYers clearly decided to take on seasonal projects in terms of home improvement and maintenance while they were forced to spend a lot of time at home.


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Use of Adhesive Dots vs. Lines for Efficient Use & Bonding for Hot Melt Applications

Posted By ASC, Thursday, August 27, 2020

Swapping dots for lines is at the core of Baumer’s latest addition to its tesla hot melt product range. It’s presented in the form of a dot-covered board which can connect the application heads with the Programmable Logic Controllers (PLCs) of machine controllers, and so provide a bonding system which reduces the amount of adhesives consumed in hot melt processes, especially in the food packaging industry.


Baumer reports that using the board, which is covered with defined dots, instead of relying on long bonding lines on the substrate, could cut the amount of adhesives consumed by half in hot melt applications, thereby creating efficiency. At the same time it keeps the reliability of the joints and their quality intact because of the exact distribution of much less adhesive, according to the company.


At the heart of this distribution is the dot board which is installed in the control cabinets of machine controllers in order to connect the tesla heads with the PLCs. The board then converts input signals received from the packaging machines into high-frequency signals which are needed by the tesla heads for them to apply the rows of dots.


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New Polyol Products Derived from Cashew Nutshell Liquid (CNSL) Released with Bio-based Grades

Posted By ASC, Wednesday, August 26, 2020

Pennsylvania-based manufacturer Cardolite has added three new polyol products , and the same number of new bio-based grades, to its range of polyurethane adhesives, sealants and coatings derived from cashew nutshell liquid (CNSL), a renewable non-food chain oil.


According to the company, all three new products are suitable for floor and industrial coatings as well as for being used as structural adhesives and sealants in construction, transportation and industrial assembly. However each has its own attributes. One of the new products combines high glass transition temperature, with high tensile strength and excellent bond strength, even when bonding with aluminum substrates. The other two are low in color and viscosity, with both providing high strength according to the company. One product adds flexibility to that strength for more toughness, while the other includes high strength and high resistance to UV light.


Cardolite reports that, in addition to producing CNSL-based polyol as a viable alternative to those based on petrochemicals, it also focuses on using the same bio-based oil for the production of epoxy, amine, and phenolic functional products for the coating, adhesive, friction, foam, and composite industries.


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