对于大多数热塑性塑料，模具上不需设置加热装置。为了缩短成型周期，需要对

For most thermoplastics, no heating device is required on the mold. In order to shorten the molding cycle, the mold needs to be cooled, and water is often used to cool the mold. That is, after the injection is completed, circulate cold water to the parts close to the cavity or the holes in the cavity parts to quickly cool the mold. <br>The design principle of <br>cooling water holes: the number of cooling water holes should be as much as possible, and the hole diameter should be as large as possible. The distance between the centerline of the cooling water hole and the cavity wall should be 1 to 2 times the diameter of the cooling water channel (usually 12mm-15mm), and the center distance between the cooling water channels is about 3 to 5 times the diameter of the water hole. The diameter of the water channel is generally above 8mm. The distance from the cooling water hole to the cavity surface should be as equal as possible. When the wall thickness of the plastic part is uniform, the distance between the cooling water hole and the surface of the cavity should be as equal as possible everywhere. When the wall thickness of the plastic part is uneven, the cooling should be strengthened at the thick wall. Strengthen cooling at the gate. <br>The cooling water channel should not pass through the insert or its joints to prevent water leakage. <br>Cooling water holes should be avoided at the weld line of plastic parts. The position of the inlet and outlet water pipe joints should be located on the same side of the mold as possible, and usually should be located on the back of the injection molding machine. A cooling water channel is opened on the mold, and circulating water is used to cool the mold. <br>Due to the melting temperature required in polypropylene (PP). At the same time, the mold temperature is required to be 60 during injection, so the mold must be heated. Mold heating methods include: hot water, hot air, hot oil and electric heating. Because the electric heating is clean, the structure is simple, and the adjustable range is large, the electric heating is applied to the mold.

For most thermoplastics, no heating is required on the mold. In order to shorten the molding cycle, the mold needs to be cooled, and the mold is cooled with water. That is, after injection molding is completed, the cold water is circulated to the hole on the part near the cavity or on the cavity part, in order to quickly cool the mold.<br>Design principles for cooling water holes:<br>The number of cooling water holes should be as large as possible, and the aperture should be as large as possible. The distance between the center line of the cooling water hole and the cavity wall shall be 1 times -2 times the diameter of the cooling watercourse (usually 12mm-15mm), and the center distance between the cooling watercourses shall be approximately 3 times -5 times the diameter of the water hole. The diameter of the waterway is generally more than 8mm. The distance between the cooling water holes and the surface of the cavity should be as equal as possible. When the wall thickness of the plastic part is uniform, the distance between the cooling water hole and the cavity surface should be as equal as possible, and when the wall thickness of the plastic part is not uniform, the cooling should be strengthened at the thick wall. The gate should be cooled.<br>Cooling water holes should not pass through the panels or their seams to prevent leaks.<br>Cooling water holes should be avoided at the fused marks of the plastic parts. The position of the import and export pipe fittings should be located on the same side of the mold as far as possible, usually on the back of the injection moulding machine. A cooling waterway is opened on the mold and the mold is cooled through the circulation of water.<br>Because the melting temperature required by polypropylene (PP) is . At the same time at the time of injection, the mold temperature requirement is 60, so the mold must be heated. Mold heating methods include: hot water, hot air, hot oil and electric heating. Because the electric heating is clean, the structure is simple and the adjustable range is large, so the electric heating is applied in the mold.

For most thermoplastics, there is no need for a heating device on the mold. In order to shorten the molding cycle, the mold needs to be cooled, and water is often used to cool the mold. That is, after the injection molding is completed, the cold water is circulated to the parts close to the cavity or the holes on the cavity parts, so as to quickly cool the mold.<br>Design principle of cooling water hole:<br>The number of cooling water holes shall be as many as possible and the hole diameter shall be as large as possible. The distance between the center line of the cooling water hole and the cavity wall shall be 1-2 times of the diameter of the cooling water channel (usually 12mm-15mm), and the center distance between the cooling water channels shall be about 3-5 times of the diameter of the water hole. The diameter of water channel is generally more than 8mm. The distance from the cooling water hole to the surface of the cavity should be as equal as possible. When the wall thickness of the plastic part is uniform, the distance between the cooling water hole and the surface of the cavity should be equal everywhere as much as possible. When the wall thickness of the plastic part is uneven, the cooling should be strengthened at the thick wall. Strengthen cooling at the gate.<br>The cooling water channel shall not pass through the insert or its joint to prevent water leakage.<br>The cooling water hole shall not be set at the weld mark of the plastic part. The position of the inlet and outlet water pipe joint shall be set on the same side of the mold as much as possible, and shall generally be set on the back of the injection molding machine. A cooling channel is arranged on the mould to cool the mould with circulating water.<br>The melting temperature required for polypropylene (PP) is. At the same time, the mold temperature is required to be 60 during injection, so the mold must be heated. The heating method of the mould includes: hot water, hot air, hot oil and electric heating, etc. Because the electric heating is clean, simple in structure and large in adjustable range, the electric heating is applied in the mold.<br>