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  • The Structure of Plastic Injection Mould Design
    The Structure of Plastic Injection Mould Design

    PTMS as an professional plastic injection mold company in china, we have much experience in plastic injection mold making, always provide high quality custom plastic injection mold and custom moulding to the worldwide customers. If you want top quality injection molds, firstly the engineer should make perfect mold design, so we will share the structure of injection mold design for the worldwide people.   Injection molds are designed as two halves, a core half and a cavity half in order to eject the component. For each cycle, the core and cavity are aligned to ensure quality. This alignment is ensured by guide pillar and guide bush. Usually, four guide pillars and guide bushes are used, out of which three pillars are of one diameter and one is of a different diameter, to force the plates into a single configuration (based on the "POKE YOKE" [mistake proof] concept). The register ring has interference fit in top plate and transmission fit with the injection molding machine pattern, aligning the machine pattern and top plate.   We are a top quality china injection mold manufacturer, also china injection molding undercut manufacturer, if you need to know more injection mold design data, you can visit our website ptms-mold.com and send us e-mail to sales@ptms-mold.com.

  •  Ejection System Types of Custom Plastic Injection Mold
    Ejection System Types of Custom Plastic Injection Mold

    PTMS as a china plastic injection mold supplier, we are also china injection mold exporter for many years, so we have many years experience in plastic injection mold making, we will share some ejection system types of injection mold for the worldwide customers.   Stripper plate ejection: This ejection is preferred for components with larger areas. This system calls for an additional plate (stripper) between the core and cavity plates. To avoid flash, the stripper plate remains in contact with the cavity plate and a gap is maintained between the cavity and core plate. Visible ejection marks are usually not noted on components. Blade ejection: This type of ejection is preferred for thin, rectangular cross sections. Rectangular blades are inserted in cylindrical pins (or cylindrical pins are machined to rectangular cross sections) to create an appropriate ejection length for the component. For easy accommodation of the ejection pin head, a counter bore is provided in the ejection plates. By rotation of core (internal threaded components): Used for threaded components, where the component is automatically ejected by rotating the core insert. Air ejection: Used to actuate the ejection pin fitted in the core using compressed air. The ejection pin is retracted using a spring.   If you want to find a plastic injection moulders in china, welcome to visit our website ptms-mold.com, we will make high quality injection mould for you, besides the engineer can design perfect ejection system types for the plastic molds.

  • Plastic Injection Mold Ejection System
    Plastic Injection Mold Ejection System

    PTMS as a professional plastic injection moulder, we have many years experience in plastic injection mold making, always provide high quality custom plastic injection mold, plastic moulds to the customers. We knew how to make top quality injection mould, the ejection system type is very important for mold making, so you should design perfect ejection system based on the plastic part.   Some ejection system types as below for your reference, hope it can help you when injection mold design.   Pin ejection: Cylindrical pins eject the finished component. In the case of square and rectangular components, a minimum of four pins (at the four corners) are required. In the case of cylindrical components, three equidistant pins (i.e. 120°apart) are required. The number of pins required may vary based on the component profile, size and area of ejection. This ejection system leaves visible ejection marks on the finished component. Sleeve ejection: This type of ejection is preferred for (and limited to) cylindrical cores, where the core is fixed in the bottom plate. In this system, the ejection assembly consists of a sleeve that slides over the core and ejects the component. No visible ejection marks are apparent on the component.   If you need to know more ejection system please visit our website ptms-mold.com and contact us by sales@ptms-mold.com, we will discuss with you for more data.

  • Custom Plastic Injection Mold Gate Types
    Custom Plastic Injection Mold Gate Types

    PTMS as an professional plastic injection mold company in china, we have much experience in plastic injection mold making, always provide high quality custom plastic injection mold to the worldwide customers. The gate is very important for injection mould, we will share some data of injection mold gate types. The two main gate systems are manually trimmed gates and automatically trimmed gates. The following examples show where they are used: Sprue gate: Used for large components, the gate mark is visible in component and no runner is required. e.g.: bucket molding (backside cylindrical gate mark visible and can be felt). Edge gate: Most suitable for square, rectangular components Ring gate: Most suitable for cylindrical components to eliminate weld line defect Diaphragm gate: Most suitable for hollow, cylindrical components Tab gate: Most suitable for solid, thick components Submarine gate: Used when auto de-gating is required to reduce cycle time Reverse taper sprue gate (Pin gate): Generally used in three plate molds. If you need top quality plastic moulds, the plastic injection moulders should design perfect gate for the injection mould, for more details please visit our website ptms-mold.com, we will share more knowledge about injection mold.

News
Type of Injection Molding

2017-11-29

hot runner injection moldPlastic injection molding parts is widely used in many industries, how to make high quality injection molding? So plastic injection mold type is very important for injection moulding production, there are two main types of injection molds - cold runner and hot runner. A runner is the channel in the mold that conveys the plastic from the barrel of the injection molding machine to the part. In a cold runner mold, the runner is cooled and ejected with the part.

 

Cold runner molding system is the most type for injection mold making. Cold runner molds usually consist of 2 or 3 plates that are held within the mold base. The plastic is injected into the mold via the sprue and fills the runners which lead to the parts in the cavity. In 2 plate molds, the runner system and parts are attached, and an ejection system is used to separate the pair from the mold. For those of you who assembled a model car at some point in your youth, the runners and the parts were not separated. The child assembling the model was responsible for that final part of the process. In 3 plate molds, the runner is contained on a separate plate, leaving the parts to be ejected alone. In both systems, the runner is re-cycled and reground, reducing plastic waste. However, these processes can increase cycle time.

 

If you need to know more details of type for injection moulding, welcome to contact us via sales@ptms-mold.com. 

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