Do hot melt adhesive particles have an odor? Is it big?

Hot melt adhesive granulesIs there any odor? Is it big?

Hot melt adhesive particles produced by legitimate manufacturers have a very low odor. Taking EVA based hot melt adhesive granules commonly used in book binding, packaging and sealing, and quick printing of graphics and text as an example, they are solid particles at room temperature and almost odorless; After heating and melting, there will be a slight odor, but qualified food grade and book grade products have a very light odor, which will dissipate in a few seconds in a ventilated environment.

Why do some hot melt adhesive particles have a strong odor?

The odor mainly comes from two aspects: one is that there are too many low molecular weight volatile compounds in the raw materials, and the other is that there are too many recycled materials mixed in. Pure new material and clean formula particles only have a very light wax smell when melted; If it is pungent, sour or even spicy to the eyes, it is mostly due to inferior materials or mixed with recycled materials. All particles of Sunlife hot melt adhesive are produced using new materials, and Guangzhou Sunlife Trading conducts odor and volatile matter testing on each batch to ensure that the workshop is user-friendly.

What factors are related to the size of the odor?

• Substrate typeEVA has the smallest odor, while polyamide (PA) and polyurethane (PUR) have slightly noticeable odors at high temperatures but still within an acceptable range.
• Operating temperatureCarbonization beyond the recommended temperature will produce smoke and odor, and controlling the temperature according to the instructions is crucial.
• Ventilation conditionsAutomatic line with exhaust system, almost odorless; It is recommended to maintain ventilation in the workshop for manual work.

Frequently Asked Questions (FAQ)

Q: Will the odor remain on the books when hot melt adhesive particles are used in the workshop of the book and magazine factory?
Answer: No. After the adhesive layer cools, the odor is basically sealed inside the adhesive, and readers cannot smell it after the book is completed, which meets the odor requirements of publications.

Q: Does a strong odor indicate toxicity?
Answer: It is not necessarily toxic, but a pungent smell usually means that there are many volatile substances, the formula is not clean, and long-term inhalation is not conducive to health. It is recommended to replace with qualified products.

Q: How to determine if the purchased hot melt adhesive particles have a qualified odor?
Answer: Take a small amount and melt it at around 180 ℃. Close it up and smell it lightly. A light wax smell is normal; If it is obviously pungent or irritating, it should be returned.

Sunlife hot melt adhesive from Guangzhou Sunlife Trading provides samples for trial use. The odor and bonding effect can be verified in small batches on our own production line before deciding on bulk purchases.