In the process of using hot melt adhesive, due to the changes of various situations, we will encounter various problems. To solve these problems, we must have a comprehensive understanding and comprehensive analysis of various factors. Today, Qingdao sainuo polyethylene wax manufacturer will take you to understand the relevant problems and solutions of hot melt adhesive for edge sealing.

pe wax for hot melt adhesive

Analyze from the aspects of temperature (substrate temperature, rubber tank, rubber coating roller temperature, ambient temperature), humidity (environment, plate), thickness (edge banding belt, glue coating), speed (opening, curing, feeding), surface (cutting accuracy, roughness), pressure (size and direction), mechanical force (cutting force size and direction), and then conduct specific analysis according to specific problems: 1. Release after bonding (1) The substandard melamine seal bottom releases the substance that causes degumming

(2) Unqualified PVC edge sealing primer is incompatible with hot melt adhesive

(3) Oily wood veneer edge bonding with incompatible hot melt adhesive

(4) When the wood veneer edge sealing is used as primer, the proportion of Tianna water or other diluent is too large, and the diluent is too strong, resulting in the expansion of hot melt adhesive, and then the adhesive edge sealing will loosen after bonding.

(5) The reason is that the hot-melt adhesive is cooled during the bonding process (sharp cooling). The stable bonding conditions (including temperature, pressure, working speed, etc.) should be maintained, otherwise the bonding effect will also be affected.

The causes of adhesive cooling (sudden cooling) are as follows:

(1) In the process of bonding, the heating time of hot melt adhesive is too short, so that the temperature of hot melt adhesive can not meet the requirements.

(2)The set temperature of hot melt adhesive is too low.

(3)Insufficient amount of glue.

(4)The temperature is too low during work or at the construction site.

(5)The substrate temperature is too low.

2. There will be “glue wire” when gluing

(1) The temperature set by the gluing machine is too low

(2) Hot melt adhesive has deteriorated before use

(3) Improper gluing procedure and method (too much gluing)

(4) The temperature difference between outdoor and indoor (construction site) is large, and the convection of air is easy to change the ambient temperature (especially in winter)

3. There is dirt or too much adhesive on the edge

(1) Too much glue

(2) Mechanical failure in trimming procedure

(3) Improper gluing position

(4) The set temperature of the heat melt is too high

4. The gluing machine has insufficient or uneven gluing

(1) There is blocking glue in the process of pre melting or at the exit of the gluing machine, which may lead to uneven gluing

(2) The operating load capacity of the machine is not enough to melt the adhesive completely

(3) The temperature setting of the heat melt is too low

5. Excessive smoke or odor

(1) The set temperature is too high

(2) Incorrect mechanical current device

(3) There is something wrong with the thermostat of the gluing machine

(4) There is something wrong with the heater

(5) The hot melter is not clean and mixed with other impurities or dust

6. Serious discoloration of hot melt adhesive

(1) It is polluted and forms oxidation

(2) Material deterioration after heating or high temperature

(3) The hot melter works for a long time without edge banding

7. Edge banding is easy to fall off during trimming process

(1) The glue is too thin

(2) Material too cold or wet (especially when just glued)

(3) If the gluing line clearly shows the pattern of the gluing roller, it may be that the temperature of the gluing roller is too low

(4) Belt speed too slow

(5) Ambient temperature or material temperature too low (below 15 ° operation)

(6) Lack of pressure

8. The initial position and station position of edge sealing are not ideal

(1) Roller roller need to master the skills to make adjustment, extend the position to increase the roller pressure.

(2) The effect is often not ideal at the beginning or the end of the 5cm position of the glued surface of the glued roller. The reason is that the pressure of the glued roller is easy to be insufficient at the head and tail position, and when it is in the high-speed production state, the contact between the glued roller and the panel is easy to jump.

9. The effect of bonding both sides is good on one side and bad on the other

(1) Poor contact between panel (substrate) and roller

(2) Uneven gluing results in glue leakage, which hinders the edge sealing process

10. Sometimes the glue is good and sometimes it’s bad

(1) The liquid state temperature of hot melt adhesive is too low

(2) When the adjustment speed of the edge banding machine is too fast and the glue amount is too high, the hot melt tank fails to melt the hot melt glue in time, resulting in uneven glue application

(3) The temperature of the fuser is unstable.

11. After bonding, the edge banding will be separated soon

(1) Hot melt adhesive, edge, substrate, cargo or pressure roller temperature is too high

(2) The temperature of construction environment (room temperature) is too high

(3) Too much glue

(4) High humidity of edge or substrate

(5) The base material and the edge sealing itself contain resin (oil) components, thus reducing the adhesion, which most often occurs in the process of using wood veneer / solid wood edge sealing

12. There are flower marks on the surface of sealing edge 1) The edge material is too thin and the surface abrasion resistance is weak 2) The edge of the panel is rough 3) The adhesive membrane lacks elasticity

Qingdao Sainuo Chemical Co.,Ltd. We are manufacturer for PE wax, PP wax, OPE wax, EVA wax, PEMA, EBS,Zinc/Calcium Stearate…. Our products have passed the REACH, ROHS, PAHS, FDA testing. Sainuo rest assured wax, welcome your inquiry! Website：https://www.sanowax.com

E-mail：sales@qdsainuo.com                

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