Due to the impact of Covid-19, our demand for disposable tableware has soared. Whether at home or in a restaurant, disposable knives will make people feel safer. Subsequently, for factories, the purchase of wholesale injection molding machine for disposable knife is also particularly important, which may be related to supply chain issues. Then, before choosing a wholesale injection molding machine for disposable knife, below content you should understand.

Basic functions of injection molding machine for disposable knife

The injection molding machine must have the following basic functions:

• The processed plastic materials can achieve plasticization, measurement and the molten material pressed into the mold cavity;

• It can have normal opening and closing and locking of the forming mold;

• The energy required in the forming process can be converted, transferred and controlled;

• The molding process and process conditions can be set and adjusted in real time;

Classification of injection molding machine for disposable knife

The injection device can be divided into two types of plasticization methods of piston and screw, especially in the most common screw injection molding machine.

• According to the clamping device, it can be divided into mechanical, hydraulic and hydraulic machinery.

• According to the structure of the injection device, it can be divided into horizontal injection molding machines, vertical injection molding machines, and angle injection molding machines. Among them, horizontal injection molding machines are more common.

• According to its special structure and processed raw materials, it can be divided into thermoplastic injection molding machine, thermosetting plastic injection molding machine, exhaust injection molding machine, foam injection molding machine, multi-component injection molding and other types.

Function and typical components of injection device

The injection device must fulfill the following functions:

Accept the free-flowing pellets, heat and plasticize the pellets, inject the melt into the molding cavity and keep the melt in the cavity under a certain pressure (hold pressure).

1️⃣Injection parts: There are two types of injection molding devices commonly used: single-cylinder and double-cylinder.

The working principle is: in the pre-forming, the plasticizing screw member is driven by a hydraulic motor to rotate the main shaft and the main shaft is connected to the screw key, the key, and the other end is connected to the hydraulic motor. When the screw rotates, one end of the plastic material is in good condition. The plasticization is melted to the front end of the barrel storage cavity, at the same time, the reactant in the screw retreat, and by making the thrust bearing thrust on the back seat, by pulling the piston rod nut straight back, metering, and injecting the injection cylinder rod into the oil cavity , In order to complete the action and screw injection operation by pushing the piston rod bearing, the push rod at the entrance of the piston rod chamber.

2️⃣Plasticized parts: There are two types of plasticized parts, namely plunger type and screw type. The screw type is generally used.

Screw-type plasticizing parts are mainly composed of screws, barrels, nozzles and other components. During the continuous rotation of the screw, the plastic realizes its physical state change, and finally appears in a molten state and is injected into the mold cavity. Therefore, the plasticized part is the key part to complete the uniform plasticization of the plastic and ensure the quantitative injection.

The basic requirements of the injection system

The main function of the injection system is to plasticize the material into the cavity under high pressure and maintain the pressure. It must meet the following requirements:

• The solid plastic material can be melted within a predetermined time period is a plasticized viscous flow state, and can be injection molded to provide a predetermined amount of uniform melt melting temperature;

• According to the process requirements, the meltable plastic is generally matched to the pressure and injection speed to the mold cavity;

• When it is completely filled, it can continue to melt in the cavity to maintain a certain pressure (holding pressure) within a predetermined period of time to ensure product feed and gas dischargecompletely.

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