TPE coated nylon. PAA. PA6. PA66
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Product details
The primary mechanism of TPE package adhesive adhesion:
The TPE bag has the difference between real plastic and fake plastic. True adhesive is the compatibility of soft glue and hard glue when softening and melting(compatibility depends primarily on the solubility parameter SP of the data. The closer the solubility parameter, the better the compatibility of the two data. Common knowledge about SP is detailed in polymer chemistry. Common knowledge), In the hard glue and soft rubber touch surface to form a layer of bonding layer, a large progress TPE soft glue and hard plastic adhesive adhesion. Pseudo-adhesive does not touch the compatibility of the two types of data. The packaging of data is through mechanical force, through the mold and the product's plan and external treatment, and through the setting effect, the soft glue and hard glue can be joined together.
TPE package adhesive processing technology:
The TPE bag adhesive is generally selected as a secondary injection molding technology. The hard plastic parts of the beer(injection molding) are fixed on the adhesive mold, and the TPE soft adhesive is injected into the hard adhesive at a suitable temperature. The product is obtained by cooling. The injection molding temperature of the coated adhesive is different according to the hard adhesive data of the coated adhesive. Because the temperature must be considered so that both hard glue and TPE soft glue must be softened, it is possible to promote the compatibility of the two types of data at the touch surface. In order to arrive at the true plastic effect, the general TPE plastic PP material injection temperature is at 170-190 degrees Celsius; The plastic ABS material is at 220-220 degrees Celsius; The temperature of the coated PC material is slightly higher than the injection temperature of the coated ABS; When coated with PA nylon, the injection temperature must reach 240 degrees Celsius.
Frequently seen TPE package adhesive data:
TPE is used for coated adhesive, TPE soft rubber as a soft adhesive overlay, and the commonly used hard data for collaboration is plastic, as well as metal and weaving. TPE and woven adhesive heads are generally fake plastic if they are used in package products, which is the same as metal packaging. True plastic is more common in secondary injection molding and two-color injection molding, that is, the main data of TPE pack adhesive is plastic. TPE can bond with some commonly used general plastics PP, GPPS, HIPS, ABS and engineering plastics PC, PC/ABS, PA and its modified data. The adhesion of TPE and POM polyformaldehyde is still a problem in the elastomer industry. Since the POM solubility parameter SP(22.6) is far from the TPE SP(7.2-7 .6), the two data are not compatible in themselves, and no suitable compatibility agent has been found to promote the outstanding adhesion of the two.
TPE is more common in packaging defects:
Lack of glue -- the injection temperature of the moving processing; Increase injection pressure; Improve data activity.
Slitting, overflow-drop injection molding temperature; Increase the locking force; Reduce injection pressure; Decline activity from formulation point of view.
Appearance of hemp surface, no light-moving molding processing temperature; Baking material, cut the moisture of the material.
Viscosity difference -- plenty of baking material before injection molding; Carving temperature; Adjust the formula.
Injection deformation of products-strengthening die cooling; The appropriate extension of the mold lock time.
Products adhesive die-add demolding agent or lubricant(about internal lubricant-demolding agent should pay attention to the amount of increase, in order to prevent the demolding agent to separate out and move out.
1. Satisfactory injection temperature. Covered nylon, TPE injection temperature is better than 190 degrees Celsius, can not exceed 240 degrees. In addition, it is necessary to obtain the effect of true coating. Since the softening temperature of nylon is 250-260 degrees, the closer the softening temperature of TPE and nylon is, the better the coating effect is.
