Shantou Hetian Machinery Manufacture Co.,Ltd

In the plastic production process, in addition to core equipment such as injection molding machines and extruders, plastic auxiliary machinery acts as an "invisible pillar", ensuring production efficiency and product quality through precise intervention in raw material processing, process optimization, quality control, and other aspects. Its importance is reflected in the following dimensions:

Raw material pretreatment: key purification from "impurities" to "qualified materials"

• Drying machine: eliminating moisture hazards

  Plastic materials such as PET and nylon are prone to moisture absorption. If the moisture content exceeds the standard, bubbles, silver lines, or degradation may occur during injection molding. The dryer uses hot air circulation or dehumidification technology (such as honeycomb dehumidification dryer) to control the moisture content of raw materials below 0.1%, avoiding a decrease in the mechanical properties of the product. For example, in the production of PET preforms, incomplete drying can lead to bottle breakage, and the precise temperature control and dehumidification ability of the dryer directly affect the yield of finished products.

• Crusher: Waste Recycling and Edge Material Recycling

  The water outlet materials and defective products generated during production can be crushed into particles by a plastic crusher and reused in production. This not only reduces raw material costs (waste utilization rate can reach 30% -50%), but also reduces solid waste emissions. The gate waste generated by injection molding machines can be mixed with new materials in proportion after being processed by a crusher, saving raw material procurement costs.

• Blender: Ensuring Material Uniformity

  When color matching and adding additives (such as flame retardants and toughening agents), the mixer disperses each component evenly through the shearing and flipping action of the stirring blades. Taking PVC pipe production as an example, if the stabilizer and lubricant are not fully mixed in the mixer, it will cause local decomposition or surface roughness during pipe extrusion, affecting the pressure resistance performance.

Process optimization: an accelerator for improving production efficiency

• Loading machine and conveying system: the core of automated feeding

  Vacuum feeders and screw conveyors can achieve unmanned transportation of raw materials from storage tanks to processing equipment, avoiding dust pollution and measurement errors caused by manual feeding. For example, in an extrusion production line, the feeding machine continuously feeds the extruder according to the set amount to ensure stable melt pressure and prevent fluctuations in profile thickness caused by uneven feeding.

• Mold Temperature Control Machine: The Key to Precise Temperature Control

  The temperature of injection molds directly affects the cooling rate and crystallinity of the product. The temperature controller controls the mold temperature within a precision of ± 1 ℃ by circulating heat transfer oil or water. When producing optical lenses, temperature fluctuations in the mold can cause uneven refractive index of the lenses, and stable operation of the temperature controller is a prerequisite for ensuring optical performance.

• Dehumidifier: the guardian of high moisture absorbing materials

  For humidity sensitive materials such as PC and PMMA, using a dehumidifier in conjunction with a dryer can lower the dew point of the air to below -40 ℃, avoiding secondary moisture absorption of the raw materials during transportation. After using dehumidification and drying combination equipment, the cracking rate of PC parts in a certain automobile parts factory decreased from 15% to below 3%.

Quality Control: The Leap from "Qualified" to "Precise"

• Measuring mixer: a "balance" for adding additives

  The precise ratio of color masterbatch and filler depends on the weight loss or volume measurement system of the metering mixer. When producing medical infusion bottles, the error in the amount of antibacterial agent added should be ≤ 0.5%. The metering mixer controls the screw speed through PLC to ensure consistent composition of each batch of materials and avoid sterilization failure caused by imbalanced additives.

• Mold temperature machine and chiller: the "double insurance" of thermal management

  The chiller provides constant temperature cooling for molds and hydraulic systems to prevent hydraulic oil deterioration or mold deformation caused by equipment overheating. In blow molding, if the chiller malfunctions, uneven cooling of the bottle blank will result in a deviation of more than 0.1mm in the wall thickness of the bottle body, which cannot pass the sealing test.

• Precision of crusher screen and blade: the quality red line for waste recycling

  The mesh aperture and blade gap of the crusher determine the uniformity of the crushed particles. If the sieve is damaged and large particle waste is mixed with new material, it will cause the screw to get stuck or impurities to appear on the product during injection molding. Due to the failure to replace worn shredder blades in a timely manner, the surface particle defect rate of a certain household appliance shell production line increased by 20%, resulting in an increase of 150000 yuan/month in rework costs.

Environmental Protection and Cost: The 'Balance' of Sustainable Production

• Energy consumption optimization: Energy saving dryers (such as heat pump drying) save 30% -50% more electricity than traditional hot air drying. The variable frequency speed regulation function of the mixer can adjust the power according to the load, reducing standby energy consumption.

• Waste recycling: By combining the crusher with the granulator, the recycling rate of waste can be increased to over 90%, reducing the purchase of new materials. For example, in an injection molding plant with an annual production of 10000 tons, waste recycling can save about 800000 yuan/year in raw material costs.

• Emission control: Dust collectors and odor treatment equipment can reduce VOCs and dust generated during crushing and drying processes, comply with environmental regulations, and avoid fines and production shutdown risks.