Why PUR glue book prevails in the United States (I)

Books bound with PUR adhesive have excellent adaptability and book-sharing performance; resistance to cold and heat; tear resistance; and adhesion to special materials, as well as the influence of ink and other factors, and many other advantages. Although it also has a large investment and other shortcomings, but in the United States, many professional binders and printing plants in the use of EVA hot melt adhesive, PVA cold glue at the same time, more focus on the PUR adhesive, and More and more contract manufacturers are beginning to use PUR adhesives. So, why does PUR rubber binding prevail in the US bookbinding market? How smart manufacturers are cleverly solving the technical problems of PUR binding, and what unexpected surprises PUR rubber binding has brought to manufacturers?

Vendor experience

In the United States, some companies engaged in the production of PUR glue binding systems have found in the long-term research and development and market operations that the use of PUR adhesives in bookbinding has become an overwhelming trend.

Henkel: PUR binding with heart

Peter Ferrier, manager of Bookbinding Division of the Henkel Group (Israel), believes that, unlike publishing printers, the use of PUR binding is a natural and necessary means for professional binding companies. This is mainly due to the fact that publishers and printers have a single job. They often only print the same job on the same substrate, while binders receive a lot of books and prints on different substrates in different directions. Order. In this case, PUR glue has its place, because it is very flexible and can adapt to different strains of the work.

Martini: 1/3 glue binding device with PUR glue binding function

In the past two years, one-third of the martini equipment sold by Martini in the United States has the PUR glue binding function. According to Kerry Burrouhgs, the binding department manager of Martini (New York), PUR rubber binding has been widely adopted in Boston, Houston, New Jersey, Rochester and New York, and has won the trust of users.

Kolbs, Warrenberg: More than 50% of the glue-binding equipment has two glue functions

Both KOLBS and Warrenberg claim that more than 50% of the binding equipment introduced by professional contract manufacturers has been equipped with both PUR adhesive coating systems and traditional heat. Melt coating system to meet the different needs of customers.

solution

PUR rubber binding is not perfect, but it also faces some problems. However, technical experts in the United States have also solved these problems brilliantly through research, making PUR gel binding more widely applicable in various fields.

Retrofit existing equipment

For PUR adhesive coating equipment, in addition to purchasing new equipment, it is also possible to retrofit old-fashioned bookbinding equipment.

According to Bob Shafer, president of KOLBUS, for the original glue-binding equipment, the modification to PUR glue can be easily achieved with the sizing system of KOLBUS or Nordson. When renovating equipment, pay attention to the following issues.

(1) Because the sizing method for PUR adhesives is mainly nozzle type and drum type, it is necessary to pay attention to whether or not the equipment has enough nozzles and rollers.
(2) A complete bookbinding system requires at least 3 or 4 spine preparation devices. Many older machines may not have enough spine preparation devices.
(3) In order to prevent the spine from deforming and to prevent the adhesive from adhering to the cutter, the device needs to be equipped with a conveyor belt that is long enough.

Get a uniform layer of glue

Martini's Burroughs said that because the thickness of PUR adhesive glue is between (1.0-1.2)×10-2 inches, it is much thinner than traditional hot-melt adhesive (2.8-3.0)×10-2 inches. In order to obtain a uniform and smooth adhesive layer, the clamp above the glue pan must remain firm, otherwise the books will move up and down, and the thickness of the glue layer will be unevenly distributed. Therefore, using parallel parallel clamps is better than hinge clamps.

reduce waste

PUR adhesive sizing system includes plastic pots, heated hoses, pre-melting devices, etc. PUR sizing equipment needs to be equipped with special pre-melting devices. According to different needs, Martini sets different types, with the following Several options are available: 55-gallon drums for large and medium-sized users, 5-gallon drums for small users, and special cylindrical drums (8-inch diameter, 16-inch long). Different models of buckets can increase PUR Adhesive utilization.

The following operations can also avoid waste of PUR adhesives during operation.

(1) Put the PUR adhesive in the sealed pre-melting device. When the glue needs the adhesive, obtain the required amount of adhesive from the pre-melting device, then pump the PUR adhesive through the pump. In a heated tube, transfer it to a plastic pot. When the glue pot no longer needs the adhesive, the cooling and solidification system in the pre-melting device cools and solidifies the adhesive. The glue exists in a solid state and will not be transferred to the pot, so that the flow rate of the glue is controlled, and the actual avoidance occurs. PUR adhesive waste.

(2) Most PUR systems are fitted with a sizing wheel similar to that used in traditional hot melt equipment. The uniqueness of Nordson's newly developed EP48V slot is that there is no similar ferry. It is reported that the closed system is very helpful in reducing PUR adhesive waste.