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Direct answer: FormalHot melt adhesive pelletsThe free sample sending process of manufacturers is usually “proposing requirements → explaining working conditions parameters → confirming sample model and quantity → sending for free (usually SF Express collect or free shipping for the first time) → customer testing on the machine → feedback results before adjustment”. The entire process takes 3-7 days. The real trouble with sending samples is not that the manufacturer does not provide samples, but that the requirements are not clearly stated.
Many printing and packaging factories have to test samples from more than ten suppliers a year, and less than 30% of them can form a conclusion in the end. The reason is often not that the glue is not good, but that the sample method is not systematic: this time we tested with copperplate paper, and next time we tested with recycled paper; After testing this machine, switch to another machine for testing; Two samples with a significant difference in parameters are compared together. The measured data are contradictory to each other, and in the end, procurement is still based on intuition when placing orders.
| Information Item | Example | Why is it important |
|---|---|---|
| Application Scenarios | Book and magazine packaging/cardboard box sealing/quick printing of graphics and text | Determine the major categories of glue |
| Equipment and machine speed | Automatic glue assembly line, 4000 copies per hour | Determine the opening hours |
| Paper Type | 128g copperplate paper covered with matte film | Determine wettability requirements |
| Ambient temperature | Workshop temperature is 18 ℃, summer transportation temperature is 45 ℃ | Deciding on softening point |
| Current glue usage issue | Winter spine cracking | Directly lock in the direction of improvement |
Guangzhou Sunlife Trading provides free samples to first-time cooperative customers, matches 1-2 models according to the above five information, and provides trial machine suggestions: clean the pot first, single variable, keep control, and observe for 72 hours. Sunlife hot melt adhesive does not advocate sending five or six models at once for customers to blindly test, as it will only increase the burden on the workshop and fail to draw effective conclusions.
Small batch samples of regular models are usually free, and shipping costs depend on the manufacturer’s policies. Customized formula sampling may incur sampling fees, which will mostly be refunded after mass production.
Suggest within two weeks. Over time, the workshop personnel, paper batch, and environmental temperature have all changed, and the value of feedback information will decrease.
Legitimate manufacturers do not know. Writing the sample batch number and key parameters (softening point, viscosity, open time) into the technical agreement when signing the order is the most direct guarantee.
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