Company Profile
Wenzhou Jingfei Plastic Machinery is located in Wenzhou Ruian, One of mostly famous Mechanism city. Our company is a manufacture of thermoforming machine, Our company is a technology innovation firm, Including machine designing, spare parts manufacture, installment, commission, and mold designing etc. Our company use modern professional management, carry out the concept "the best quality is the based of building reputation mostly important ".during the processing, we hardly control the quality, reject all disqualification parts.
Why Choose Us
Our factory
Wenzhou Jingfei Plastic Machinery is located in Wenzhou Ruian, One of mostly famous Mechanism city. Our company is a manufacture of thermoforming machine, Our company is a technology innovation firm, Including machine designing, spare parts manufacture, installment, commission, and mold designing etc
Our products
We have thermoforming machine / extruder production line / vacuum forming machine / blister packaging line.
Production market
Our machine widely sale to USA, Greece, Serbia, Indonesia, Vietnam, Malaysia, Middle east, South America.
Our service
We supply 24 hours on line after service. We also send the engineer to clients work shop for installment and commission the machine. we have one year warrantee time, During these time, all the mainly machine parts broken, we will change the new parts for free.
Pressure Thermoforming Machine
Pressure Thermoforming machine for PP food box use the air to forming the blister, firming firm and well, cutting smooth and neat.
Microwave Disposable Plastic Meal Lunch Box Thermoforming Machine is mainly produce for PP food box, lunch boxes , could thermoforming PP/PS/PVC/PET.
Plastic Injection Molding Machine
Fully Automatic Thermoforming machine for Egg tray boxes, Food boxes, Fast food boxes.
Automatic Plastic Thermoforming Machine
Automatic plastic thermoforming machine is special design for PP, PS, PVC,PET,PLA,BOPS Film.
Food box Thermoforming machine is design by Our Technical, this machine is the mostly advanced machine in China.
Cake Tray Forming Machine
Plastic Trays Forming Machine could produce products widely use in food, pharmaceutical, cosmetic, daily chemical ,hard ware , stationery etc.cat planning cepteur sint occaecat
Disposal plastic thermoforming machine could produce many different kinds of disposal plastic products, lid food box, biscuit trays, ice cream trays toy trays.
Small forming area machine use air blowing forming the plastic, could use PP/PS/PVC/PET different kinds of raw material.
Mini 3 Station Thermoforming Machine
Mini 3 Station thermoforming machine mainly work for PP food box , PET egg trays. PP Lid , PP biscuit trays Etc.
What Is Plastic Injection Molding Machine
Plastic injection molding machines are used to manufacture large quantities of plastic parts. People use them in various industries, including automotive, aerospace, medical, and consumer products. Injection molded parts are made by melting plastic pellets and injecting them into a mold cavity. The desired part shape is formed, the part is cooled, and is ejected from the mold. There are many different types of plastic injection molding machines available, each with unique features and capabilities. Some machines are better for high-volume production, while others are ideal for small runs and prototyping. The size of the machine can also vary depending on the size of the parts that you produce.
Advantages of Plastic Injection Molding Machine
Flexibility
Manufacturers can choose the plastic injection mold design and type of thermoplastic that's used for each component. This means the injection molding process can produce a variety of components, including parts that are complex and highly detailed.
Efficiency
Once the process has been set up and tested, injection molding machines can meet high volume production. Using electric injection molding machines also makes the process relatively energy efficient.
Consistency
If the process parameters are tightly controlled, the injection molding process can produce thousands of plastic parts quickly at a consistent quality.
Cost-effectiveness
Once the mold (which is the most expensive element) has been built, the cost of production per component is relatively low, particularly if created in high volumes for mass production.
Types of Plastic Injection Molding Machines
Hydraulic injection molding machine
The creation of leak-free systems for the molding process is one of the most important aspects of hydraulic injection. Hydraulic oil May frequently spill into the plastic, causing imperfections. To protect the engine, it was necessary to carefully study seal design. Hydraulic injection molding machines have been popular due to their inexpensive cost and ease of maintenance.
Electrical injection molding machine
It has been utilized as a replacement for the larger hydraulic machine ever since. High-speed service motors are used in electrical injection molding. It is simple to operate and more modern than the traditional hydraulic ones.
Based on the injection molding cost, a lot of factories prefer this type of machine. This is because of the comfort and speed of production provided by this equipment, it is extremely cost-effective. At the same time, an electric hydraulic machine requires less maintenance and has a digital control option. This allows you to customize the amount of energy and pressure required.
Hybrid injection molding machine
Hydraulic injection molding and electrical injection molding are combined in this molding technology. It was created with both molding advantages and has proven to be superior to the previous two varieties. This molding method is very flexible and has the same selling quality as the previous two types of molding machines. It May switch between the dc pump motors and the hydraulic pump, allowing each to function just when it is required. There are no quality compromises as a result of this.
Plastic injection molding machines work by melting plastic pellets and injecting them into a mold cavity. The machine has a hopper where you load the plastic pellets, a barrel where the plastic melts, an injection unit where you inject the molten plastic into the mold, and a mold where the plastic cools and solidifies.
The injection molding process starts with the plastic pellets being fed into the hopper. The pellets are then heated and melted in the barrel, which is equipped with a screw that moves the plastic forward. Once the plastic melts, you then inject it into the mold cavity at high pressure, where it cools and solidifies into the desired part shape.
The injection molding cycle includes many parameters which need to be tightly controlled to ensure the overall quality of the plastic components produced. Understanding the process and parameters in some depth will help manufacturers to identify plastic components producers who can provide the quality and consistency they need.
Step 1: Selecting the right thermoplastic and mold
Before the actual process begins, it's key that the right thermoplastics and plastic injection molds are selected or created, as these are the essential elements that create and form the final components. Indeed, to make the right selection, manufacturers need to consider how the thermoplastic and mold interact together, as certain types of plastics might not be suitable for particular mold designs.
Each mold tool is made up of two parts: The mold cavity and the core. The mold cavity is a fixed part that the plastic is injected into, and the core is a moving part that fits into the cavity to help form the component's final shape. Depending on requirements, mold tools can be designed to produce multiple or complex components. The repeated high pressures and temperatures that mold tools are put under mean they are typically made from steel or aluminum.
Step 2: Feeding and melting the thermoplastic
Injection molding machines can be powered by either hydraulics or electricity. Increasingly, essentra is replacing its hydraulic machines with electric-powered injection molding machines, showing significant cost and energy savings.
Injection molding machines consist of a feeder or 'hopper' at the top of the machine; a long, cylindrical heated barrel, which a large injection screw sits in; a gate, which sits at the end of the barrel; and the chosen mold tool, which the gate is connected to.
Step 3: Injecting the plastic into the mold
Once the melted plastic reaches the end of the barrel, the gate (which controls the injection of plastic) closes and the screw moves back. This draws through a set amount of plastic and builds up the pressure in the reciprocating screw ready for injection. At the same time, the mold halves close together and are held under high pressure, known as clamp pressure.
Injection pressure and clamp pressure must be balanced to ensure the part forms correctly and that no plastic escapes the tool during injection. Once the right pressure in the tool and screw is reached, the gate opens, the screw moves forward, and the molten plastic is injected into the mold.
Step 4: Holding and cooling time
Once most of the plastic is injected into the mold, it is held under pressure for a set period. This is known as 'holding time' and can range from milliseconds to minutes depending on the type of thermoplastic and complexity of the part. This holding time is key to ensuring that the plastic packs out the tool and is formed correctly.
After the holding phase, the screw draws back, releasing pressure and allowing the part to cool in the mold and the plastic solidifies. This is known as 'cooling time', it can also range from a few seconds to some minutes and ensures that the component sets correctly before being ejected and finished on the production line.
Step 5: Ejection and finishing processes
After the holding and cooling times have passed and the part is mostly formed, ejector pins or plates eject the parts from the tool. These drop into a compartment or onto a conveyor belt at the bottom of the machine. In some cases, finishing processes such as polishing, dying or removing excess plastic (known as spurs) May be required, which can be completed by other machinery or operators. Once these processes are complete, the components will be ready to be packed up and distributed to manufacturers.
Injection Molding Parameters of Plastic Injection Molding Machine
Clamping pressure, or also referred to as the tonnage, is the pressure required to hold the mold halves during the injection step. It complements the applied injection pressure. The part surface area, part depth, and size of the mold are also considered when calculating and optimizing the clamping pressure.
Insufficient clamping force applied can result in leakage of the molten plastic and the development of flashes. Excessive clamping force applied can result in not only part defects but also failures on the mold and the equipment itself. Fractured hydraulic cylinders, cracked platen and mold plate and crushed mold vents are some of the potential damages on the equipment in the long run induced by excessive clamping force.
Injection pressure is the pressure applied by the screw or plunger to force the molten plastic through the cavities until it is 95% filled. The flow characteristics of the molten plastic, such as viscosity and shear rate, also influence the required injection pressure. Molten plastics with higher viscosity have more resistance to flow, hence higher injection pressure is required to maintain the volumetric flow rate of the shot.
Injection pressure should also be controlled. Insufficient injection pressure can result in part defects and early solidification of the molten plastic in the mold channels. Excessive injection pressure causes pressure build-up because the internal pressure inside the cavities spikes when it is 95% filled, which can lead to the premature opening of the mold.
Holding pressure is applied after the cavity is 95% filled until the solidification of the gates. It is about half of the injection pressure. Holding pressure is necessary to improve the compactness of the molded part and to control shrinkage and cooling of the part.
Injection speed refers to the rate at which the screw or plunger moves to transfer molten plastic into the mold cavities. For most applications, it is advantageous to maximize the injection speed to fill the cavities with molten plastic as quickly as possible.
Factors to Consider When Buying Plastic Injection Molding Machinery
As many of us in the machine industry are aware, plastic injection molding is just as relevant and important as any other machining process. There are many things to consider when considering purchasing plastic injection molding equipment, such as: Shot size, tie bar spacing, ejector stroke, platen size, and tonnage.
Shot size
Shot size is best defined as the maximum amount of plastic that the injection molding machinery is capable of injecting into the molding cavity during one molding cycle. When searching for a machine, it's always a best practice to look for a machine that is capable of producing 30-40% greater shot sizes than what your parts require.
Tonnage
In this case, I mean "clamp tonnage or clamping pressure." this could be considered the same concept as when you're examining press brakes. With press brakes, tonnage capabilities are measured by how many tons of downforce the machine is capable of directing towards a workpiece. However, with plastic injection molding machines, tonnage is measured by how many tons with which the machine is capable of pressing together the platens, which hold the mold cavity and form the plastic that is injected into said cavity to produce the desired part.
Platen size
The platen is the "table" or tool that holds the mold cavity. Spaced apart, the mold is inserted and clamped securely to the platens. Once the two platens come together and are held under the pressure of tonnage, the plastic is heated, injected under pressure, and then allowed to cool through a molding cooling cycle. Here, the plastic takes on its hardened, final shape while continuing to be kept in place with many tons of pressure to retain the desired shape.
Tie bar spacing
The holes in the platen allow pins to pass through it, ejecting molds.Tie bar spacing is defined as the space between the horizontal tie-bars on an injection molding machine. Basically, this measurement, along with the platen max spacing, determines the maximum size of molds that can be placed in the molding machine.
Ejector stroke
Simply put, ejector stroke is the action of the machine pushing out (ejecting) the final workpiece from the platens using ejector pins. The ejector in the molding machine pushes against an ejector plate on the mold, ejector "pins" or rods are attached to this plate and perform a pushing operation on the molded part after the plastic has hardened and the mold has opened.
Wenzhou Jingfei Plastic Machinery is located in Wenzhou Ruian, One of mostly famous Mechanism city. Our company is a manufacture of thermoforming machine, Our company is a technology innovation firm, Including machine designing, spare parts manufacture, installment, commission, and mold designing etc. Our company use modern professional management, carry out the concept "the best quality is the based of building reputation mostly important ".during the processing, we hardly control the quality, reject all disqualification parts. During the marketing and after service , We give the best advise of Our clients, help clients to built a good marketing , increase the competition on Our clients. Our mainly products is PP-550 Automatic Thermoforming Machine. This machine is Our technical innovated according to the marketing request. This machine could automatically feeding the sheet,heating,forming, punching,cutting, stacking and waste reclaiming.
FAQ
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