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At the moment of glue coating or breaking, a thin wire is pulled out from the end of the sealing or gluing line, which is called “drawing” in the industry.Hot melt adhesive granulesAfter melting, it is a high viscosity hot fluid, and once the temperature, flow rate, and nozzle structure are not matched, this type of filament is prone to occur. Light cases can stick to the equipment and be difficult to clean, while heavy cases can wrap around the pages or cardboard boxes, forming residue that affects appearance and yield.
| reason | performance | What to do |
|---|---|---|
| The adhesive temperature is too low | Adhesive viscosity, multiple broken threads | Adjust to the recommended range for this grade (usually 160-180 ℃), and use a thermometer to verify the actual glue temperature |
| Carbon deposition on nozzle/glue roller | Uneven glue dispensing and localized wire drawing | Weekly shutdown for coke cleaning, using specialized cleaning agents or high-temperature air burning for adhesive removal |
| Moisture or impurities in the rubber particles | Bubbling, bursting glue, and excessive threads | After opening, seal and store. Before use, preheat and dehumidify to avoid mixing materials |
| The model does not match the adhesive type | Spray gun wire drawing is obvious | Open scraper and spray gun have different viscosity requirements, and low/medium viscosity models are selected according to equipment |
One is to make the glue temperature, vehicle speed, and glue amount into a “job standard card”, and first test the machine with a small sample before changing the batch number; Secondly, priority should be given to selecting branded materials with stable melt index and low impurities. The granular materials for books, magazines, and packaging supplied by Guangzhou Sunlife Trading for Sunlife hot melt adhesive have undergone viscosity and softening point testing before leaving the factory. The batch fluctuation is small, and the probability of drawing on the machine is significantly lower.
Q1: Are wire drawing and “not sticking firmly” the same thing?
No. Wire drawing is a problem of broken adhesive shape, while weak adhesion is a problem of bonding strength. The causes of the two are different and need to be investigated separately.
Q2: Can raising the temperature solve wire drawing?
not always. Excessive carbonization will accelerate and produce odors, and adjustments should be made within the allowable range of the grade.
Q3: Will changing to a lower viscosity adhesive affect the fastness?
Yes, so choose the model according to the substrate, don’t blindly reduce viscosity just to avoid drawing.
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