The Role of Project Management in Injection Moulding Industry

Injection molding project management plays a fundamental role in the injection molding industry. This is also true with the other industries . The details, which will get specified at a project are all documented and coordinated to achieve the final objective of the plastic project. This helps all the members work according to their defined roles and responsibilities and helps in reaching the target.

Demand Forecasting

Project management is the planning, scheduling, and controlling of all injection molding project activities. It is the process of making sure that all project work is completed on time and within budget. Project management can be used in a variety of injection molding situations. Project management can be used when there is uncertainty in the amount of resources needed to complete a task or project. Project managers may have to manage large numbers of people working toward a common goal.

Injection moulding industry demand forecasting is done by using statistical models such as regression analysis, ARIMA and Box-Jenkins models or seasonal ARIMA models. All these methods give an indication about future demand for products over a certain period of time but they do not guarantee that demand will be met at this level.

Demand forecasting uses various techniques like statistical modeling, trend pattern analysis and seasonal factors to predict future demand for injection molding over a certain period of time but does not guarantee that demand will be met at this level.

The main objective of demand forecasting is to predict future sales volumes for injection molding products based on historical data about past sales volume trends or seasonal factors that influence consumption patterns (such as holidays). Demand forecasts are typically required by injection molding manufacturers / distributors / retailers who want to know how much of a product to produce, so they can ensure that there is enough inventory on hand at all times to meet customer demand.

Initiating the Project

Without project initiation and planning, there can be no injection molding project. The essential elements of project initiation are to set goals and objectives so that control will be exercised to assess the actions undertaken during the course of the project. A thorough feasibility analysis is necessary to determine whether the project is even viable, taking into account its location, costs and resources, etc.

Initiating the injection molding project is the first and most important phase of project management. This is where the process for creating a new product or project begins. The main objective of this phase is to organize all activities as well as determine all procedures that are essential for delivering the final product. The development of a strong foundation for the remaining project management phases ensures the smooth running of the entire process.

Planning the Project

A project plan is the roadmap for your entire injection molding project. It is a living document that is used over and over during the lifecycle. Your whole team will use this document, which means you need to keep it up to date after each meeting with your team. There are a few main components that I always try to include in the project plan.

  • Injection molding project scope and deliverables (what is the goal of this project?)
  • Injection molding project schedule (when will we do what?)
  • Resource requirements (who will work on this project and when?)
  • Injection molding project cost estimation (what does it cost to do this project?)
  • Risk management (what could go wrong, and what should we do if it does?)
  • Communication plan (who needs to know what, when?)

Product and Process Design

Injection molding project design is not always an easy task. Designing have to be done in such way that your product could be mass produced and giving unique look and feel to it as well as must have all the features mentioned in the idea. You also need to keep all of the legal requirements into consideration and this should be a worry free process for you. Here are some steps that you can adopt for successful plastic product design for injection moulding。

Identify the design requirements: Before you start designing your plastic product, you need to understand what are the requirements from your client. This will help you to decide all of the different aspects which should be included in your design. For example if you are designing a bottle for water then it should have an opening on top and mouth wide enough so that people can easily drink water out of it.

MaterialsPlastic manufacturers often select a standard grade of plastic for a similar application or based on supplier recommendations. However, these resins may not be optimal. In plastic selection, there are many factors to consider, including:
Heat: The stress created by normal and extreme conditions of use and during the assembly, finishing, and shipping processes.
Chemical resistance is a property affecting part performance when solids, liquids, or gases are in contact.
Agency approvals: Standards developed by the government or the private sector for properties like heat resistance, flammability, and mechanical and electrical performance.
Assemblage: During the assembly process at plastic factory, the plastic is bonded, mechanically fastened, and welded.
Finish: Ability of the material to come out of the mold with the desired appearance values, such as gloss and smoothness.
Price: The price of resin, costs of manufacturing, maintenance, assembly, disassembly, and other costs to reduce labor, finishing, and tools.
Access: The availability of resin from the point of view of the amount required for production of plastic manufacturer.
DraftA draft angle makes it easier to remove a cooled, finished part from a mold . Draft angles are an essential component of injection molding. Minimizing friction during the part release process can achieve a uniform surface finish and reduced wear and tear on the mold at plastic factory.
An angle of the draft is measured according to the direction of pull. Draft angles of at least 0.5° for the cavity and 1.0° for the core are suggested by most design engineers for parts with sufficient draft. The tool must also be designed with more draft if a textured surface is desired and steel shut-off surfaces.
Wall ThicknessThe wall thickness of injection molded parts is also an important consideration. An injection molded part from plastic products supplier with a proper and uniform wall thickness is less prone to structural and cosmetic problems.
Most resins have a typical wall thickness ranging from .04 – .150. Yet, it is recommended that you obtain thickness specifications for your material(s) of choice by consulting with an injection molder/design engineer and plastic manufacturer.
Wall thickness should be analyzed during the design process to ensure that parts don’t sink, warp, or become non-functional.
RibsAs ribs are used to reinforce the walls of your injection molded parts without increasing their thickness, they are a valuable component in injection molded parts. Rib design should reduce mold flow length when designing complex parts and ensure that the ribs are appropriately connected to increase the part’s strength.
Ribs should not exceed 2/3 of the wall thickness, depending on the material used. WIDE ribs may create sinking and design problems. It is typical for a design engineer and plastic manufacturer to core out some fabric to reduce shrinkage and keep the strength.
If the height of the ribs exceeds 3 times the wall thickness, this could result in the part being short/unable to be filled. Rib placement, thickness, and length are critical factors in determining the viability of a part in its early design phases.
GateIn a mold part, a gate is a point at which liquid plastic flows into it. Injection molded parts have at least one gate, but they are often produced with multiple gates. Runner and gate locations influence polymer molecules’ orientation and how the part shrinks during cooling. As a result, gate location affects your part’s design and functionality.
The gate should be placed at the end of a long and narrow part if it must be straight. It is recommended to have a gate positioned in the centre of parts that must be perfectly round.
With the input of your plastic manufacturer team, you will be able to make optimal decisions regarding gate placement and injection points.
Ejector PinMold ejector pins (located on the B-side/core of the mold) are used to release plastic parts from a mold after being molded. The design and positioning of ejector pins should be considered as early in the process as possible by plastic manufacturers. This is even though they are usually a relatively minor concern in the early design phases. Indentations and marks can result from improperly placed ejector pins, so proper placement should be considered in the early phases.
Ejector pins are typically located at the bottom of side walls, depending on the draft, texture, depth, and type of material. You might be able to confirm that your initial ejector pin placement was correct by reviewing the design. In addition, you may be able to make further changes to improve production outcomes.
SinkSink marks can appear on the injection molded plastic part during injection moulding when the material shrinks more in thicker areas such as ribs and bosses. In this case, the sink mark is caused by thicker areas cooling slower than thin ones, and the different cooling rates lead to a depression on the adjoining wall.
Sink marks are formed due to several factors including the processing method, the geometry of the part, the material selection, and the tooling design. The geometry and material selection of the part may not be able to be adjusted based on its specifications, but there are several options to eliminate sink areas.
Sinking can be influenced by tooling design (e.g., cooling channel design, gate type and gate size), depending on the part and its application. The manipulation of process conditions (for example, packing pressure, time, phase of packing, and conditions) can also reduce sink. Further, minor tool modifications (e.g., foaming or gas assist) can reduce sink. It is best to consult your injection molder and plastic manufacturer regarding the most effective method to minimize sink in injection-molded parts.
Parting LinesFor more complex parts and/or complex shapes, it is important to note where the parting line is located.
Having your design shared with your injection molder can greatly influence your finished product’s production and functionality since designers and molders tend to evaluate parts differently. The challenge of parting lines can be addressed in several ways.
It’s important to be aware of the importance of the parting line when designing your initial concept, but you are not limited to that. You may be able to locate other possible locations using CAD software and mold flow analysis. When you work with an injection molder, they keep your part end use in mind and help you determine where the parting lines should be placed.
Special FeaturesIt is essential to design plastic parts so that mold tools can open them and eject them without difficulty. Injection molds release parts by separating the two sides in opposite directions. A side action may be necessary in some instances, where special features such as holes, undercuts, or shoulders prevent the release from occurring.
Coring is pulled in a direction opposite that of mold separation as a side action. In some cases, costs may increase due to this flexibility in part design.
When designing and developing a product, you (plastic manufacturers )were having the right injection molder, and engineer on your side is essential. You can avoid many issues by working with them. In integrating these elements into your product design process and working with a plastics engineer who has experience with these materials, your goal will be to get your product to market as quickly and cost-effectively as possible.

Product Quality Control

Product quality control is a major concern for injection molding manufacturers. But what about product quality control does not get the attention it deserves? The answer is failures. What cause failures with products, and how do you predict which products to determine as failures before they even leave your factory? It’s quite simple: poor quality procedures. plastic product quality control starts with good manufacturing practices (GMP) being accurately put into place. GMP standards guide the manufacture of products in a way that ensures they will meet the expectations of consumers.

Cost and Profit Analysis

Project management is a mega-trend sweeping the world… and for good reason. With project management, even small companies can handle big project work, and get the best deal for their business.

The biggest advantage of project management is that it way improves cost and profit analysis (CPA) You can cut down on time and costs by using the experts. And this increases profitability as profits are maximised after all the resources have been used to their optimum. This article points out the latest assignment in this field which is making use of innovative management software like NetSuite; keeping an eye on resource allocation; focusing on potential risks; monitoring progress at least weekly and much more!

Why those important for injection molding cost

injection molding cost
injection molding cost
  • Part size- bigger parts mean a bigger mold, which means that bigger steel will increase the steel cost for the injection mold.
  • Part design- the more complex a part is, the more detailed the mold has to be. Some complicated parts will require special features to be added, such as lifters or sliders. Therefore, you should be open to advice from your mold maker and see if there’s anywhere that you can alter the part design to save on injection mold costs.
  • Materials: Depending on the part material of choice, the injection mold will have to be made of a particular material. For instance, if corrosive plastic-like PVC is to be used, the mold will have to be stainless steel to avoid any damage, ultimately bump the price up.
  • Part finish requirements- where parts have high gloss surface requirements, then more expensive steel and precise technical polishing will be vital, adding to the price.
  • Production volume- higher volume molds need more cavities, and so the mold will be larger. They also require a higher steel grade to last for longer, which impacts the injection mold cost.
  • Country of manufacture- different countries have different wage rates. If your mold is made in a country where labor costs are low, then you’ll naturally save money. In China, the average cost of an injection mold is around 40% less than in western nations.


Project Management is an important tool which helps to keep a track of the injection molding project at each stage and ensure that everything goes well without any hassle.

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