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The manufacture of casual, athletic and athletic shoes is a labor-intensive process involving many production steps
.
Many of these are still manual operations, such as the application of adhesive, which is usually done with a brush
.
When gluing the upper material and the outsole, it is imperative to ensure an accurate dose and a very precise application in the correct location so that the sole does not come off and avoid a noticeable overdose
.
Hotmelts based on Covestro's Desmomelt® U thermoplastic raw material powder can now be applied automatically in precise doses using digital printing technology
.
Polyurethane dispersions have proven their worth in adhesives for handmade footwear
.
But attempts to automate manual applications with robot-assisted processes have so far been unsuccessful
.
Digital printing, on the other hand, enables shoemakers to automate the application of adhesives to the highest level of precision
.
This is significantly more efficient and faster because processing steps can be saved, and the precise digital application can reduce the waste that needs to be processed
.
Adhesive joints exhibit the same high quality as previously hand-produced
.
Adhesive digital application on smartphone display
Adhesive digital application on smartphone displayManufacturers of smartphones and other electronic devices must streamline production, be more cost-effective and automate as much as possible to remain competitive
.
In addition, consumers' purchasing decisions are increasingly influenced by whether a product can be recycled at the end of its useful life
.
Covestro enables electronics manufacturers to efficiently apply hot melt adhesives based on its Desmomelt® U polyurethane adhesive raw materials in digital processes
.
For thermoplastic adhesives, end-of-life recycling can also be facilitated
.
Applying adhesive to smartphone displays is often a time-consuming part of the manufacturing process
.
For example, films to which adhesives are applied must be precisely cut beforehand
.
A similar process is based on a potentially reactive two-component hot melt adhesive film that remains crosslinked after the joining process, creating a particularly strong adhesive between the components
.
However, due to this strong bond, disassembly at the end of the useful life is often difficult
.
Efficient assembly
Efficient assemblyHotmelt adhesives based on Desmomelt® U can be applied precisely where needed by digital printing
.
Automation of adhesive application reduces the required processing steps
.
However, complex, CAD-based adhesive bonding paths are possible
.
After using the smartphone, the parts can be disassembled under temperature control if only thermoplastic raw materials are used
.
If particularly strong adhesives are required, the digital application of two-component latent reactive hotmelts based on Desmomelt® U and Desmodur® crosslinkers is also possible
.
The new adhesive raw materials based on Desmomelt® U are aliphatic and thus prevent yellowing
.
They combine the advantages of water-based adhesives, such as high molecular weight, environmental compatibility and performance, with the ease of processing of hot melt adhesives
.
Opening hours can be adjusted according to customers' wishes, which makes processing more flexible
.
The project is part of Covestro's comprehensive plan to systematically advance digitalization
.
One of the three pillars of the Digital@Covestro" program is the development of new business models and digital technology services
.
One of the focus areas is more efficient production at the customer and the digitization of the entire value chain
.
The other two pillars of the program are Focus on the digital operation process of the company's own production and the development and use of the digital chemical trading platform
.