What kind of hot melt adhesive particles are used for binding bid documents without opening? The rush night of a graphic and text fast printing shop

The two things that are most feared in bid binding are flipping pages and opening glue, and cracking the spine of the book. The solution is to chooseGood flexibility, opening time 6-10; s、 Softening point 85; Up and down in ℃ofHot melt adhesive granulesCooperate with moderate back milling and sufficient clamping time. The bidding documents are mostly 80%; G double adhesive paper with colored separators, uneven paper thickness, cannot be pressed down by “brushing more adhesive”.

The situation that night

At 9pm, the client sent 32 bidding documents and requested them to be delivered before 8am the next day. The store uses regular low-priced rubber granules. After the first batch of 8 samples were tested, the most frequently reviewed qualification page was directly opened with glue, and white marks indicating that the glue had not penetrated could still be seen at the gap between pages. It takes more than three hours to redo, but time is simply not enough.

Three steps of on-site diagnosis

• Look at the cross-section.Tearing open the spine of the book, the adhesive peels off in a whole shell shape, indicating insufficient penetration – high viscosity or low temperature.
• Look at the milling back.The milling depth is only 0.6; mm， The paper fibers are not exposed enough, and the adhesive has no bite surface.
• Look at the clamping.In order to catch up with the schedule, the clamping time has been adjusted to 3; s， The glue entered the cutting process before it was fully formed.

Adjusted parameters

After the material replacement is redone, 5 randomly selected samples are flattened and folded at 180 degrees, each 30 times without cracks or missing pages; On the cross section at the position of the spacer and the colored plug, it can be seen that the adhesive has penetrated into the paper fibers. The work ended at 2:00 am and was delivered at 7:40 am. The customer subsequently transferred all the monthly bidding documents to this store for binding.

Four Reminders for Colleagues

• The bidding document is a living piece that can be flipped through and examined carefully, and flexibility is more important than simply high strength.
• Mixed paper (copperplate spacer+double adhesive text) must be sampled first, do not use conventional live parts parameters to rigidly fit.
• The last thing to compress during rush work is the clamping time, which directly determines whether the glue will crack or not.
• Keeping a dedicated adhesive granule for books and periodicals is much more secure than borrowing materials from various sources at the last minute.

Frequently Asked Questions (FAQ)

Q: The number of pages in the bid is not many. Can we use staples and seals?
Answer: Some bidding documents explicitly require that the adhesive cannot be disassembled or replaced, and it is necessary to read the binding terms of the bidding documents before bidding.

Q: Is it better to mill deeper back?
Answer: No. Too deep will weaken the paper connection strength, usually 0.8-1.2; Mm is sufficient, fine tune according to the paper and page number.

Guangzhou Sunlife Trading provides small package sizes of Sunlife hot melt adhesive for graphic and text fast printing stores. It supports sampling before placing an order and can provide recommended process parameters for different types of products such as bidding documents, brochures, and manuals.