Furthermore, in the two-color mold injection molding process, the parting line is determined based on the product's design and aesthetic requirements, as well as whether the processing is possible and the location of mold layout follow-up glue. It may be broken down into three categories: The point on the parting line is where the straight line meets the object surface at a point. If the straight line meets the object surface in a straight line segment, any point on this straight line segment may be utilized as a parting line point. The concept of the shortest connecting line with neighboring points is usually employed to decide which point is utilized as a point on the parting line. two shot molding may also be decided in an interactive manner. The line intersects the object at multiple points and segments, indicating that the intersection of the global approach cone and the mold opening direction is zero, indicating that the core pulling is designed in this area, and the mold parting line is determined by the shape and size of the core pulling.

The heating components are connected to the barrel, and within the barrel is a reciprocating screw, which is why the machine is known as a reciprocating screw type injection molding machine. The feed zone, transition zone, and metering zone are the three zones of the reciprocating screw. The material is transferred from the hopper to the barrel in the feed zone; in the transition zone, also known as the compression zone, the material is compressed; and in the metering zone, in front of that screw, there is an NRV that prevents backflow of material so that it does not return inside the barrel during injection. When you charge the material from the hopper to the barrel but rotate the screw backward, the material is charged; now that we have filled our barrel with the plasticized raw material, the materials are essentially in the granules, it is ready for injection. However, before injection, we must shut the mold using the clamping system, which may be toggle ram or completely electronic. Once closed, the cooling pipes will cool the mold using a temperature controller or water system.

Internal Stress Analysis in Plastics - Reciprocating Screw Injection Molding

For complicated components, you can use CAD tools to identify and assess the split lines, or you can utilize the recommended splitting line, but it may not be the only choice; examine whether it will work both functionally and aesthetically. Parting lines may take many shapes depending on the design of the injection mold or plastic components. Vertical parting line: this line is produced perpendicular to the mold opening direction. Beveled parting line: the form of the parting line is beveled, as the name suggests. Curved parting line: As the name suggests, the separating line is curved. Stepped parting line: The plastic parting line is made in a stepped form by machinists. There is typically a strong force on one side of the cavity for this kind of separating line. As a result, relative sliding between the die's fixed and movable halves is possible. This force may then be balanced by applying an injection force to both sides of the cavity. Comprehensive parting line: developed on the basis of the plastic part's structure, it may incorporate all other parting line types.

Plunger-plunger injection molding machines and screw plunger injection molding machines are both widely used. Instead of a screw in the plasticizing chamber, the plunger-plunger type injection molding machine performs the same purpose. There is a plunger and heaters used for plasticizing, the functions of both the plunger type injection molding machine and a screw plunger type injection molding machine are quite similar, but the result and efficiency of a screw plunger type machine are more efficient than plunger type injection molding, the raw material is plasticized by heaters in plunger-plunger type injection molding machine The plunger injection molding machine pushes the plastic in the barrel forward, causing it to pass through the diverter shuttle and then inject it into the mold via the nozzle.

Internal Stress in Injection Molding - Plunger Injection Molding Machine

In a few methods, plastic injection molding may be used to combine two (or more) components into a single component. How can this help a product developer? Let's take a closer look at the advantages of insert molding and overmolding. The act of connecting one of the insert's components to a pin or other retaining fixture inside a plastic injection molding tool is known as insert molding. When the mold is closed, thermoplastic resin is molded around the implant, firmly securing it in place. A threaded screw fitting or an electrical contact is often used as the insert. Threaded fittings are sometimes called as 'nutserts.' Using inserts in this way makes sense, especially for screw fittings, since it avoids the need for further drilling and tapping, which wastes time and money. Inserts may also be used on thin-walled casings that are too thin to allow for a tapped hole. Most importantly, insert molding is compatible with conventional injection molding machines, removing the need for expensive equipment changes.

There are two chambers in a screw plunger type injection molding machine, one chamber to plasticize the raw material and another chamber to inject the material inside the mold, so the upper section consists of a plasticizing chamber in which the hopper is attached, the material inside the hopper is transmitted in the plasticizing chamber, and then the plasticized material is tra