The bonding of acrylic products is a very important process in acrylic processing. How to show the clear and transparent characteristics of acrylic, embody the value of acrylic tobacco and tobacco packaging crafts, maximize the grade and taste of acrylic crafts, bonding technology Played a pivotal role.
The bonding of acrylic plates is mainly affected by two aspects, one is the applicability of the adhesive itself; the other is the bonding technique.
There are many kinds of adhesives in the domestic and foreign markets, mainly in two types, one is two-component, such as universal adhesive, epoxy resin; and the other is one-component, such as CHCl3 (chloroform). Generally, the two-component adhesive is bonded by a curing reaction, and the one-component adhesive is a final volatilization of a solvent to achieve bonding.
The two-component adhesive is characterized by good bonding effect, no bubbles after bonding, no whitening, and high strength. The disadvantages are complicated operation, high difficulty, long curing time, slow speed, and difficulty in adapting to mass production. The general one-component adhesive is characterized by high speed and can meet the process requirements of mass production. The disadvantage is that the bonded product is easy to produce bubbles, easy to be white, and has poor weather resistance, thereby directly affecting the acrylic products. External beauty and product quality. Therefore, in the processing of acrylic products, how to choose a suitable adhesive and improve the grade and grade of acrylic products is a big problem that must be solved first in the bonding process.
In addition, the bonding skills are also very important. Here are a few of our common bonding processes, and a brief analysis of their practical experience.
1. Docking: Place two acrylic plates to be docked horizontally on the operating platform, close them, and stick a tape on the bottom to leave a gap of no more than 0.3mm to prepare the adhesive. Use a syringe to inject the adhesive from one side evenly and slowly from the gap until it is fully filled. After the film is fully cured, remove the tape.
2, façade bonding: façade bonding is the most widely used bonding technology, and is widely used in the production of various acrylic IT electronic digital display products. First wipe the surface to be bonded clean. It is better to use the master to achieve the bonding so that the adhesive does not shake, which is beneficial to improve the quality of the bonding. The acrylic plate with a thickness of 3mm is bonded, and the thin metal wire can be padded, the bonding is completed by capillary action, the wire is extracted before the adhesive is cured, or the adhesive tape can be used, and then the adhesive is applied by bonding. .
3, bevel bonding: bonding bevel must use a 90 degree angle and other models to prevent the displacement of the surface. The application adhesive should be uniform and slow. The master can be removed after it has been fully cured.
4, surface bonding: plane bonding is a special bonding method. First wipe the surface to be cleaned and place it horizontally, and apply a proper amount of adhesive to it. One side of another acrylic plate was placed obliquely on the acrylic plate to which the adhesive was applied, and then evenly and slowly dropped, and the bubbles were driven out from one side to complete the bonding. The acrylic adhesive can erode the surface of the acrylic sheet and leave traces that are difficult to remove, so that the adhesive-free portion can be used to protect the portion that does not need to be bonded. Grease, dust or air holes can prevent uniform application of the adhesive and leave air bubbles. Excessive use of a small amount of adhesive will cause air to be introduced when the bond is shrunk. Direct blowing causes the edges of the bonding surface to become white due to the volatilization of the adhesive. Indoor humidity, temperature, etc. all have a direct effect on the bonding of acrylic sheets.
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