Bookbinding hot melt adhesive

[China Aluminum Industry Network] "Thong Strip" VS "Casting" Process Comparison

(1) The strip-type heat insulation aluminum profiles are generally divided into three processes: teeth, wear strips, and rolling.

Open tooth: Use a device with a hard roller gear to roll out the part of the aluminum profile where the heat insulation strip is to be threaded out of the tooth. The purpose is to increase the roughness of the profile by hobbing so as to increase the shear force of the profile after assembly. As the profile is divided into two parts inside and outside, according to the needs of production, the opening device is generally two.

Wear strips: It is to put the insulation strips on the profiles, and connect the inner and outer profiles to prepare for the next roll. One device can be.

Rolling: This process is divided into three steps: guiding and pre-clamping, main clamping, and straightening (horizontal direction, vertical direction), which is the key to ensure the tightness and verticality of the finished profile.

(2) "Pouring process" is to move the surface treated aluminum profile through the running system in a straight line so that when the heat insulation groove of the aluminum profile passes under the pouring head of the casting machine, the liquid heat insulation material flows into the insulation groove and passes through. After a period of solidification, cut the bridge.

"Striped" versus "cast" thermal insulation

(1) The heat-insulating material of the “striping process” is a heat-insulating strip. At present, the regular heat-insulating strip is polyamide 66 (namely Polyamide 66, commonly known as nylon 66). There are two production methods: hard-top method and traction method. . The hard-top method has a tight structure and a good appearance but is relatively "brittle." The toughness produced by the traction method is good but the appearance is poor, and the side has a process depression. In order to pursue the appearance of beauty and precision, using PA66 nylon plus ultra-fine glass fiber is a common feature of foreign insulation bars (rarely use other materials). Due to the use of ultrafine glass fiber, the tensile strength is only 60N/mm, and it is expensive.

(2) The current insulation material of the "pouring process" is mainly polyurethane heat-insulating adhesive. Its composition is generally composed of a resin component and an isocyanate component.