1.Electronic wire
1.1. Rough surface
① Temperature is too low: adjust the temperature appropriately
② PVC baking is insufficient: bake the rubber material according to the operating standard (time/temperature)
③ The head pressure is too low: replace the outer mold with a longer corridor section and increase the number of mesh sheets
1.2. Bubbles on the extruded surface
① Extrusion temperature is too high: reduce the extrusion temperature
② PVC is not baked enough: increase the baking time
1.3. Uneven surface
① The extrusion temperature is too high and bubbles appear: reduce the extrusion temperature and reduce the distance between the water tank and the extruding head
1.4. PVC shrinkage/melting loss
①Conductor is not preheated: the preheater temperature should be adjusted appropriately (copper wire is not oxidized, but it is hot to the touch)
②The extruding head pressure is small/the temperature is too low: use the pressurized outer mold, and the head eye mold temperature is slightly increased
③The water tank is not overheated, and the tension of the wire storage rack is too large: overheated water is used during extrusion, and the tension of the wire storage rack should be reduced as much as possible
1.5. Center eccentricity
①Mold aperture is too large: Replace the mold (inner mold is too small/outer mold is too large)
②Mold is not installed properly: Reinstall the mold
③Incorrect distance between inner and outer molds: Adjust the distance between inner and outer molds based on the principle of first close and then far
1.6. Others
① Poor appearance caused by strand jumping: Replace the inner and outer molds with slightly larger apertures
② Insufficient PVC mixing causes slag accumulation on the outer eye: Increase the extrusion temperature and reduce the distance between the outer mold aperture and the inner and outer eyes
③ Scratches: Scratches caused by the outer mold, replace the outer eye
④ Copper wire plugged between the inner and outer eye molds: remove the mold and clean the inner and outer molds
⑤ The guide wheel and wire storage rack of the water tank are scratched: Place the wire on the guide wheel and wire storage rack in a suitable position, and replace them in time if they are damaged
2.Sheathed wire
2.1.Appearance shows the finished product texture
① Wrapping pattern: Too large pressure (too far distance between inner and outer molds). The distance between inner and outer molds is about 2M/M during production
The outer mold is too small: In production, the outer mold should be 0.1-0.3M/M larger than OD.
② Braiding pattern
(1) The outer mold is too small: Too small eye mold will cause poor appearance due to high pressure. In production, it is advisable to use an outer mold with a slightly larger aperture (the specific aperture size is subject to the actual production change)
(2) The distance between inner and outer molds is too far: In production, the pressure is too high due to the distance between inner and outer molds, resulting in obvious braiding pattern/try to press it as empty as possible during production
2.2. Poor appearance of over-powdered wire
① The quality of talcum powder directly affects the appearance of the wire, so the talcum powder must be baked and dried before use. In this way, the talcum powder can be evenly distributed on the warp wire. During production, the semi-finished product must pass through the middle of the brush to avoid poor appearance due to excessive powdering. Too small outer molds and too close inner and outer molds will lead to poor extrusion appearance. Pay special attention during production
2.3. Poor peeling of outer sheath and adhesion of core wire
① When the pressure of the extruding head is too high during production, it will cause poor peeling. Try to avoid excessive pressure by increasing the aperture of the outer mold during extrusion. Secondly, the water tank should be as close to the head as possible. The water volume should be as large as possible to achieve rapid cooling
② Poor isolation causes poor peeling, winding deviation, loose braiding, etc., which causes the outer sheath to attach to the core wire and cause poor peeling. In production, pay attention to the selection of the inner mold. It should not be too small (it is better to use semi-finished products to slide easily through the eye mold)
③ Too little powder causes poor peeling. In production, due to talcum powder Moisture and too little powder will cause peeling difficulties. Before production, bake and dry the talcum powder in time. Add talcum powder in time during extrusion, and adjust (reduce) the distance of the mold when accelerating
④ Core wire adhesion: Core wire adhesion is generally caused by the rubber melting point being too low and the high temperature melting and sticking together when extruding the outer sheath. In production, the first section of the water tank should be filled with the maximum amount of water to achieve rapid cooling. If necessary, release agent or powder should be applied when twisting. When extruding the outer sheath, you can also use release agent first and then powder
⑤ Some customers require high wire stripping force. In actual operation, the extrusion conditions can be adjusted according to customer requirements
2.4. Eccentricity
① The inner mold is too large: In order to make the outer mold look good when it is extruded, an inner mold with a slightly larger aperture is generally used. However, if the inner mold is too large, it is easy to cause intermittent eccentricity or eccentricity during high-speed extrusion. Try to avoid an inner mold that is too large during production
② The mold adjustment screws are not tightened. After the center adjustment is OK, tighten the four mold adjustment screws in time and then start the machine normally
③ Double parallel line eccentricity adjustment
a. Select the inner mold, the spacing must match the outer mold. If the spacing is too small, the copper wire will deviate inwards
b. The inner mold aperture should not be too large, otherwise the speed will increase and it will easily cause eccentricity