What is the free sample shipping process for hot melt adhesive granules? These 6 sample sending misconceptions are the easiest to go through in vain

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.

Industry Status: A bunch of samples have been sent, but not a single conclusion has been reached

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.

The Six Most Common Sample Shipping Misconceptions

• Misconception 1: Only saying ‘glue to be used for binding’Without mentioning machine speed, paper, or book thickness, the manufacturer can only provide a universal version, and the test results are naturally mediocre.
• Misconception 2: Too few samples500 grams of rubber granules were not even enough to cover the bottom of the glue pot, mixed with old glue for testing, and the mixture tested was a mixture of two types of glue. The reasonable amount is 5-25 kilograms, enough for a single machine.
• Misconception 3: Changing the sample directly without cleaning the glue potThe conclusion that residual old glue can change viscosity and curing speed is completely unreliable.
• Misconception 4: Only Look at the Effect of the DayMany problems with hot melt adhesive only manifest after 72 hours, and not dropping pages on the same day does not mean it will not crack next month.
• Misconception 5: Changing two variables simultaneouslyAt the same time as changing the glue, the temperature and amount of glue were adjusted, and it was unclear who was responsible for the problem.
• Misconception 6: Not leaving a control groupThere is no comparison between samples from the same batch made with raw rubber, and the extent of improvement depends entirely on subjective feelings.

Information that should be provided for a valid sample shipment

Sample caliber for Sunlife hot melt adhesive

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.

Frequently Asked Questions

Is sending samples always completely free?

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.

How long does it take to provide feedback after receiving the sample?

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.

Will the bulk product change its formula after the sample passes?

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.