According to the U.S. Department of Transportation, the $60 billion U.S. rail freight industry is considered one of the most dynamic freight systems in the world. Efficient at moving heavy freight over long distances, this system offers companies significant efficiency and cost benefits.
However, shipping via rail subjects packaging to demanding temperatures for a greater period of time than traditional over-the-road shipping. These aspects can make it difficult to keep products securely packaged.
Let’s take a closer look at a company that was struggling with this issue and how Bostik helped.
Customer’s Rigid Packaging Problem
A large consumer goods manufacturer was looking to lower its transportation costs by switching to rail shipments instead of truck. However, the company’s finished cases of product were unable to stand up to rail’s higher ambient shipping temperatures.
Additionally, the packaging failures were even more pronounced on lower cost, denser, higher recycled content stocks.
This is because traditional hot melt rigid packaging adhesives are expected to survive standard shipping conditions from 20°F to 140°F and adhere to commodity case and carton stocks.
Rail shipping temperatures, however, significantly exceeded this temperature range, causing bond failures. This company needed an adhesive able to bond to dense board stock and withstand a 160°F+ environment.
Bostik’s Rigid Packaging Solution
Metallocene-based adhesives in general have good heat resistance as well as low viscosity, making them ideal for this application. However, existing metallocene formulations did not provide the required adhesion and penetration into the recycled stock and did not exhibit the required 160°F heat resistance.
So, in order to solve this customer’s shipping problem, Bostik had to think innovatively, outside the box.
- Innovation with Olefin-based Polymers
Our company had been working with new grades of olefin-based polymers. These polymers improve adhesion to board stock and increased heat resistance without sacrificing processability or stability.
Laboratory testing of this new formulation demonstrated improved adhesion and temperature resistance. Further optimization led to Bostik’s H9636A as a candidate for long-term evaluation.
Customer trials confirmed that H9636A adhered to their most difficult substrates and survived high shipping temperatures.
- Bostik’s H9636A Ideal for Harsh Rail Shipping Conditions
Bostik’s H9636A is the ideal adhesive for applications that require adhesion to problematic stocks. Given its broad capabilities, this rigid packaging adhesion can be used to consolidate several adhesive applications within a plant. Additionally, H9636A:
- Can be used in extreme shipping conditions and in “hot fill” applications
- Has survived shipping conditions as high as 170°F for five days
- Is suitable for foodstuffs that are packaged hot, such as syrups and some jar and canned goods
- Leads to a clean running, easy-to-apply product with minimal down time associated with char
This product is available in mini-pastilles, which work well in high throughput, vacuum-feed systems. For more information on mini-pastilles’ benefits, check out our infographic. You can also call 800-7-BOSTIK.
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