Common Problems and Analysis of Hot Melting Glue Enclosure 13

1, after bonding release
1) Unqualified Melamine seal bottom release material causing degumming
2) Unqualified PVC cover coating(medium) is incompatible with hot melt glue
3) Oiliness of the skin seal and incompatible hot melt adhesive
4) When the skin seal is used as a primer, the water or other diluent is too large and the thinner is too strong, causing the hot melt to expand, and then the adhesive seal edge will bond and release.
5) The cause is caused by the cooling(sharp cooling) of the hot melt adhesive during the bonding process. The stable adhesion conditions(including temperature, pressure, working speed, etc.) should also affect the bonding effect.
The cause of adhesion to cooling(sudden cooling) is as follows:
During the process of gluing, the heating time of the hot melt glue is too short, so that the temperature of the hot melt glue can not meet the requirements
The temperature set for hot melt glue is too low
3 Not enough glue
The temperature is too low during work or construction
The base temperature is too low

2, when coated with glue, there is "glue" produced
1) Coating machine setting temperature is too low
2) Hot melt glue has deteriorated before use
3) Inappropriate coating procedures and methods(excessive amount of glue)
4) The temperature difference between outdoor and indoor(construction site) is large, and the convection of air easily changes the ambient temperature(especially in winter).
3, the edge is stained or too much adhesive
1) Overdosed
2) Mechanical failure of the trim procedure
3) Inappropriate location of the coating
4) Hot melt setting is too high
4, glue machine deficiency or uneven situation
1) The glue machine has blocked adhesive during the pre-melting process or at the adhesive exit, which may cause uneven coating.
2) Machine operating load capacity is not enough to thoroughly melt adhesive
3) Hot melt temperature setting is too low
5, excessive smoke or odor
1) Set the temperature too high
2) Incorrect mechanical current device
3) Coating machine thermostat failure
4) Heat generator failure
5) Heat melt is not clean and mixed with other impurities or dust
6, hot melt glue serious discoloration
1) Contaminated, forming oxidation
2) Material deterioration after heat or high temperature
3) Heat melt works long hours without sealing operation

When the trim procedure is carried out, the sealing edge is easy to fall off
1) Too thin coating
2) The material is cold or wet(especially in the case of glue)
3) If the pattern of the coated drum is clearly visible and displayed, the temperature of the coated drum may be too low
4) The conveyor belt is too slow
5) The ambient temperature or material temperature is too low(below 15 °)
6) Insufficient stress
8, the initial position and position of the sealing edge are not ideal
1) The roller press wheel needs to master the skills to make adjustments and extend its position to increase the roller pressure.
2) The initial or final 5cm position of the adhesive panel of the rubber roller often has an unsatisfactory effect, because the rubber drum at the head and tail position is prone to insufficient pressure, and when it is in a high-speed production state, the contact between the rubber drum and the panel is easy to beat.
9, the effect of bonding on both sides is good, the other side is not good
1) Poor contact between panel(substrate) and roller
2) Imeven coating causes glue seepage and hinders the sealing process

10, adhesive condition intermittent poor
1) The liquid state of hot melt glue is too low temperature
2) When the sealing machine is too fast to adjust and the coating amount is too high, the hot melt cylinder can not melt the hot melt glue in time, resulting in uneven coating.
3) The temperature of the hot melt is unstable
11, the edge of the seal is quickly separated after bonding
1) Hot melt glue, the temperature of the sealing edge, substrate, cargo or pressure drum is too high
2) The temperature(room temperature) in the construction environment is too high
3) Excessive coating
4) Excessive humidity of the sealing edge or substrate
5) The substrate and the sealing edge itself contain resin(oil) components, thus reducing the adhesion, most often in the process of using woodskin / solid wood sealing edge
12, there are flower marks on the surface of the seal
1) The sealing material is too thin and the surface resistance is weak
2) The edge of the panel is rough
3) Lack of elasticity of mucous membranes

13, the surface of the edge has a nib shape or bulge
1) Since the hot melt glue has been contaminated with dust particles or wood debris, it will become convex after pressure. Therefore, it is necessary to ensure the cleanliness of the hot melt.