After a textbook printing factory replaced its’ cheap glue ‘, complaints about page drops for one semester have been resolved

The story begins with a complaint phone call

A printing factory in Central China that produces textbooks and teaching aids has been using the lowest priced bulk materials for a long time in order to reduce costsHot melt adhesive granulesI don’t usually see any problems, but every time we ship in large quantities during the start of the school season, the school gives feedback that some exercise books fall off after flipping them a few times, and uneven glue layers can be seen on the side of the spine, with some areas not leaking into the paper. An order from the district education bureau was also required to be reworked, putting a lot of pressure on the factory director.

They were stuck in ‘only looking at unit price’ before

The factory manager only calculates the price per kilogram, without taking into account implicit costs such as labor for page dropping and rework, expedited logistics, and loss of customer trust. What’s even more troublesome is that the source of bulk adhesive is unstable, with slight fluctuations in melting point and viscosity for each batch, and the process parameters need to be adjusted accordingly. Experienced technicians rely on their hands to put out fires, and the quality fluctuates between good and bad.

After changing suppliers, I did three things

• Switch to using fixed brand names with testing reports attached for each batchSunlife Hot Melt AdhesiveBook binding series, stable parameters, no need to adjust the process every day.
• Cure the adhesive temperature, coating amount, and milling depth according to the recommended grade into a standard work card, which new personnel can also follow.
• For each batch of goods, 20 sample books are first tested for page dropping and flipping, and only those that pass the test are put online.

Result

In the first school season after changing the glue, the number of complaints about falling pages decreased from tens in previous years to zero; What’s even more surprising is that the overall cost has actually decreased – the savings from rework and urgent fees are much greater than the price difference of rubber granules. The factory director said, “So cheap glue is the most expensive

Two suggestions for printing factories

• Choose glue based on the “total cost upon receipt”: glue price+rework+logistics+trust, don’t just focus on the quotation per kilogram.
• Prioritize choosing brands that can provide stable supply, produce testing reports, and are willing to send samples for trial production, in order to be more stable in the long run than “which one has the lowest price”.

FAQ

Q: Are big brands necessarily much more expensive than small ones?
Answer: Not necessarily. The stable unit price of standardized supply often has advantages, and the key is not to sacrifice parameter stability for low prices.

Q: How to verify that the new adhesive is truly more stable than the old adhesive?
Answer: Conduct page drop/flip tests on three consecutive batches of sample books to observe data fluctuations; Small fluctuations indicate stability. Guangzhou Sunlife Trading can provide trial production plans and parameter suggestions according to your paper type.

Q: Is the threshold for small-scale trial production high?
Answer: Not high. Sunlife hot melt adhesive supports small package minimum order and first shipment of samples, with corresponding series for books, sealed boxes, and quick printing. The trial production risk is low, and it is suitable for small batch verification before increasing the quantity.

Summary: The zero complaints of missing pages in textbooks rely on shifting from “comparing unit prices” to “comparing total costs”, selecting stable grades and adding curing processes to sample production, and ensuring stable quality.