plastic injection molding machine

How to Choose The Right Injection Molding Machine?

In general, customers who have been in the injection molding industry for many years have the ability to judge and choose the right injection molding machine to produce. However, under certain conditions, the customer may need the assistance of the manufacturer to decide which specification of the injection molding machine to use, even if the customer may only have sample or idea of the product, and then ask whether the manufacturer’s machine can produce, or which model comparison Suitable for.


In addition, some special products may need to be equipped with special devices such as accumulators, closed circuits, injection compression, etc., in order to produce more efficiently. This shows that how to determine the right injection molding machine to produce is an extremely important issue. The following information is provided for reference only.


The important factors that often affect the selection of an injection molding machine include molds, products, plastics, molding requirements, etc. Therefore, the following information must be collected or available before making the selection:


  1. Mold size (width, height, and thickness), weight, special design, etc.
  2. The use of plastic types and quantities (single material or multiple plastic).
  3. The appearance size (length, width, height, thickness), weight, etc. of the injection molded product.
  4. Molding requirements, including a few, product quality, production speed and so on.


After obtaining the above information, you can follow the steps below to select the right injection molding machine:


  1. Choose The Right Type: Determined by the product and plastic models and series. Since there are many types of injection molding machines, it is necessary to determine exactly which type of injection molding machine or which series should be used to produce this product.


  1. Put It Down: Determine whether the “large pillar distance”, “die thickness”, “minimum die size” and “die plate size” of the machine are appropriate by the die size to confirm whether the die is released.


  1. Get Out: Judging from the mold and finished product “open mold stroke” and “travel mold stroke” is enough to allow the finished product to be removed.


  1. Locked Up: The “mold clamping force” is determined by the product and plastic. When the raw material is injected into the mold cavity with high pressure, it will produce a hold-up force, so the clamping unit of the injection molding machine must provide enough “clamping force” to prevent the mold from being opened.


  1. Shoot Full: Determine the required “shot volume” and select the appropriate “screw diameter” from the finished product weight and number of cavities.


  1. Shot Well: Some engineering plastics require high injection pressure and appropriate screw compression ratio design to have better molding effect. Therefore, in order to make the finished product shot better, the need for injection pressure and the compression ratio need to be considered when selecting the screw. .


  1. Shooting Fast: Confirmation of “injection speed”. Some finished products require high injection rate and rapid injection to stabilize molding, such as ultra-thin finished products. In this case, it may be necessary to confirm whether the injection rate and the injection rate of the machine are sufficient, and whether it needs to be matched with a pressure accumulator, a closed-loop control device, or the like.


After the above steps, in principle, injection molding machines that meet the requirements can already be determined. If you have requirement or need more information of energy saving injection molding machine, I recommend you to visit Multiplas Enginery Co., Ltd. – they specialize in manufacturing a wide range of injection molding machines. Today, contact with Multiplas for more details!


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How Vertical Injection Molding Assists the Insert & Over Molding Process

One of the most standard injection molding machines utilized by injection molders is the horizontal press. In horizontal injection molding machines, the mold opens and closes in a horizontal direction, and the injection unit of the machine follows in a horizontal direction.


Since maintaining heat stabilization is vital for an ideal injection, the sprue bushing stays in contact with the injection unit on horizontal presses. The result means that the process has reduced the amount of excess material, as well as reducing the common defects. Once the molten plastic has been injected into the mold and is ready for ejection, the horizontal press then helps. Since the mold is on a horizontal path once open, gravity assists with ejection of the part causing it to fall from the mold.


With vertical injection molding – the mold will open and close in a vertical direction.  Vertical injection molding machines are primarily used for applications that create finished products that contain two pieces utilizing the concept of over molding or insert molding. With the mold opening in a vertical direction there is easier access to insert substrates and metal inserts. In addition, gravity aids in holding the inserts or substrates in position during mold closing. This also provides easier access to retrieving finished parts, instead of the parts dropping to a conveyor or bin, which is especially useful if the components are fragile.


Vertical injection molding takes advantage of gravity instead of trying to fight it due to the vertical mold alignment. Another advantage of vertical/vertical injection molding machines is the ability to work with multiple molds and simultaneous operations on a rotary turntable by utilizing multiple bottom halves allowing inserts to be loaded in one bottom while the other is molding with the top half. The result is greater efficiency and faster productivity.


Over Molding


The process of over-molding is molding two different plastics one on top of or around the other. The mold must be meticulously designed and the molding process expertly executed. If the balance between the pieces is off – the resulting product will become distorted or fail. The pieces must fit together so it is a single component free of gaps and stress. This results in a single structure that is strong and rigid on the inside yet flexible, colorful and easy to hold on the outside. This makes hand held items ergonomically and aesthetically pleasing and makes products effective with shock absorbency, which can help eliminate noise and vibration. It can also cover sharp corners and edges, and it can increase the longevity of your devices and tools by helping to keep out dust, water and vapor.


Besides adding style – the process can:

  • Add handles to products without grips.
  • Make sleek or coarse surfaces easier to grab.


Insert Molding


Insert molding is a manufacturing process that combines thermoplastic and metal components into a finished part. This involves placing various types of inserts into specially designed molds; the plastic is then injected into the mold, and quickly fills in the features around the insert. This creates an assembled and incorporated component that is ready for use.


Utilizing engineered plastics improve wear resistance, tensile strength, and weight reduction – and metallic materials for both strength and conductivity. This process utilizes methods like over molding, which helps to strengthen the part, and provide resistance to both vibration and shock.


The varieties of inserts that can be molded into plastic components vary widely from:


  • Screws
  • Studs
  • Contacts
  • Clips
  • Pins
  • Rivets
  • Threaded Fasteners
  • Bushings
  • Tubes
  • Magnets


And made from materials such as:


  • Brass
  • Stainless steel
  • Bronze
  • Aluminum
  • Copper
  • Monel and nickel/nickel alloy


Insert molded components are used in housings, instruments, knobs, devices and electrical component for a wide array of applications in the medical, defense, aerospace, electronics, industrial and consumer markets.


Get more information about injection molding machines please do not miss the website of MULTIPLAS Enginery Co., Ltd. – the company specializes in a variety of plastic injection moulding machines. If you have any interest, welcome to check out MULTIPLAS product pages.



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5 Major Advantages to Using Plastic Injection Molding for the Manufacturing of Parts

Plastic injection molding is extremely versatile method of producing parts and products. It is one of the preferred methods for manufacturing parts because it has multiple advantages over other methods of plastic molding. Not only is plastic injection molding simpler and more reliable, it is also extremely efficient. You should have no doubts about using this method to manufacture parts.


Here are 5 major advantages of using injection molding for manufacturing plastic parts and components.


  1. Detailed Features and Complex Geometry


The injection molds are subjected to extremely high pressure. As a result the plastic within the molds is pressed harder against the mold compared to any other molding process. Due to this excessively high pressure, it is possible to add a large amount of details into the design of the part.


Furthermore, due to high pressure during the molding process, complex and intricate shapes can easily be designed and manufactured which otherwise would have been too complicated and expensive to manufacture.


  1. High Efficiency


Once the injection molds have been designed to the customer’s specifications and the presses pre-programmed, the actual molding process is very quick compared to other methods of molding. Plastic injection molding process hardly takes times and this allows more parts to be manufactured from a single mold. The high production output rate makes plastic injection molding more cost effective and efficient.


  1. Enhanced Strength


In plastic injection molding, it is possible to use fillers in the injection molds. These filler reduce the density of the plastic while it being molded and also help in adding greater strength to the part after it has been molded. In fields where parts need to be strong and durable, plastic injection has an option that other molding processes do not offer.


  1. Ability to Use Multiple Plastic Types Simultaneously


One of the major advantages of using plastic injection molding for manufacturing parts is the ability to use different types of plastic simultaneously. This can be done with the help of co-injection molding, which takes away the worry about using a specific type of plastic.


  1. Automation to Save Manufacturing Costs


Plastic injection molding is an automated process. A majority of the injection molding process is performed by machines and robotics which a sole operator can control and manage. Automation helps to reduce manufacturing costs, as the overheads are significantly reduced. Furthermore, with reduced labor force the overall cost of manufacturing the parts is reduced and this cost saving can easily be passed on to the customer.


Furthermore, automation allows for making precise and accurate injection molds. Computer aided design (CAD) and computer aided manufacturing (CAM) allow close tolerances during the making of the molds.


The Bottom Line


Using injection molding also ensures the parts manufactured hardly require any work after the production. This is because the parts have more or less a finished appearance after they are ejected from the injection molds.


Today, plastic injection molding is an environment-friendly process. The scrap plastic generated during the production process is reground and re-used. Hence, the process generates very little waste.


If you need more information about injection molding, you can try to check out Multiplas’s website: They offer vertical injection molding machine, plastic injection moulding machine, multi-color injection molding machine, etc. Feel free to contact with Multiplas to gain further details.



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