Cracking, including filamentary cracks, microcracks, whitening, cracking on the surface of the workpiece, or trauma crisis caused by the die sticking of the part and the sticking die of the flow channel. According to the cracking time, the mold is cracked and applied.
Secrets of injection molding process adjustmentJasmineHL
The close relationship between injection speed and product quality makes it a key parameter of injection molding. By determining the start, middle, and end of the filling speed segment, And to achieve a smooth transition from one set point to another set point, a stable melt surface speed can be ensured to produce the desired molecule and the smallest internal stress.
When acrylic products are processed by injection molding, defects such as warping, deformation, bubbles, cracks, wrinkles, pitting, craters, flashovers, weld marks, burns, silver threads, and spray lines are common. What kind of solution should we adopt when warping occurs?
What is the 4 process of plastic injection molding?JasmineHL
The plastic injection molding process mainly includes four stages: filling, holding pressure, cooling, and demolding. These four stages directly determine the molding quality of the product, and these four stages are a complete continuous process.
Cracking, including filamentary cracks, microcracks, whitening, cracking on the surface of the workpiece, or trauma crisis caused by the die sticking of the part and the sticking die of the flow channel. According to the cracking time, the mold is cracked and applied.
Secrets of injection molding process adjustmentJasmineHL
The close relationship between injection speed and product quality makes it a key parameter of injection molding. By determining the start, middle, and end of the filling speed segment, And to achieve a smooth transition from one set point to another set point, a stable melt surface speed can be ensured to produce the desired molecule and the smallest internal stress.
When acrylic products are processed by injection molding, defects such as warping, deformation, bubbles, cracks, wrinkles, pitting, craters, flashovers, weld marks, burns, silver threads, and spray lines are common. What kind of solution should we adopt when warping occurs?
What is the 4 process of plastic injection molding?JasmineHL
The plastic injection molding process mainly includes four stages: filling, holding pressure, cooling, and demolding. These four stages directly determine the molding quality of the product, and these four stages are a complete continuous process.
What is the injection molding process theory -dgmf mold clamps co., ltdJasmineHL
The nature of friction between macromolecules when molten plastic flows is called the viscosity of plastics, and the coefficient of this viscosity is called viscosity, so viscosity is a reflection of the fluidity of molten plastics. The larger the viscosity, the stronger the melt viscosity. The worse the fluidity, the more difficult the processing.
Solutions to silver defects in injection molded parts -dgmf mold clamps co., ltdJasmineHL
Silver pattern: The needle-like silvery-white frost-like fine lines on the surface of the injection molded part. The direction of the opening is along the direction of the flow. Where the plastic part is not completely filled, the front end of the fluid is rough Silk pattern).
Influence of injection molding process on product quality -dgmf mold clamps c...JasmineHL
During the molding process of converting plastic particles into plastic products, plastics are often subjected to high temperature and high pressure and flow molding at high shear rates. Different molding conditions and processes will have different effects on product quality. Plastic injection molding has plastics. Raw materials, injection molding machines, molds and injection molding processes are composed of four aspects.
Basic requirements for plastic injection molded part designJasmineHL
Plastic Part Design Basic Requirements
Unreasonable design of plastic injection molded parts often results in some inherent defects in the product. For example, the structure of the parts is unreasonable, the parts use too much material, etc. Here are a series of basic requirements for plastic injection molded parts design for reference.
1. Causes of dents
1.1 The thickness of each part of the product is different
1.2 Insufficient pressure inside the mold
1.3 Insufficient mold cooling
1.4 Deformation due to the insufficient cooling time
Reasonable product design and mold design are key technologies that affect the success of injection molding. This article introduces some basic principles of injection molded product design and mold design.
1. The basic conditions of plastic product design
1.1. Record the product usage conditions as detailed as possible.
These conditions are:
A. Use environment
Outdoor conditions (sunlight, rain, ice, snow, dust), sunlight (ultraviolet rays, radiation, etc.), contact with gas (corrosive gas, water vapor), contact with liquid (water, detergent, oil, medicine, etc.), other (plasticizers), copper);
B. Use intensity
Common temperature, maximum temperature, minimum temperature (usually, special circumstances, outdoor, warehouse, window, car, etc.), repeated cold and hot
C. Use load
Common load, maximum load (normal, special circumstances. Static, dynamic, repeated, continuous, impact, drop, etc.).
What are the key points of precision injection moldingJasmineHL
Precision injection molding is affected by many related factors and environmental conditions, and the most basic are the four basic factors of plastic materials, injection molds, injection molding processes, and injection molding equipment.
In the early stage of designing plastic products, engineering plastics with corresponding performance requirements should be selected according to the application environment.
Secondly, the appropriate injection molding machine should be selected according to the selected plastic material, finished product dimensional accuracy, part weight, quality requirements, and expected mold structure.
Injection mold is a tool for producing plastic products; it is also a tool for giving plastic products a complete structure and precise dimensions. The structure of the injection mold and the quality of mold processing directly affects the quality and production efficiency of plastic parts. The most common and most common causes of injection mold failures and troubleshooting methods in the production of injection molds and plastic products are described in detail as follows:
In a sense, the injection mold is also a replacement device, that is, the plastic melt enters the mold cavity and simultaneously replaces the air in the mold cavity. In fact, the air in the mold is not limited to the cavity, especially the three-plate injection mold, and the air in the flow channel cannot be ignored. In addition, the plastic melt will produce a small amount of decomposition gas. These gases must be exhausted in time.
Five elements of injection molding process parametersJasmineHL
The injection molding process is one of the four major plastic molding processes. The barrels, basins, toys, and other daily products we use in our lives are all formed by the injection molding process. So what are the important factors to pay attention to in the plastic injection molding process?
The completion of the injection molding process generally requires six processes of clamping, filling, holding pressure, cooling, demolding, and opening the mold. In these six processes, we must remember these five elements, namely pressure, speed, position, temperature, and time.
How to solve the profile problem of injection molded parts -dgmf mold clamps ...JasmineHL
Generally speaking, automotive series components, and some parts with sealing requirements, usually put forward the concept of contour size requirements.
This eBook is dedicated to all of the product designers and engineers who are tasked with creating perfect plastic parts. We have outlined four key factors that go into making a high-quality plastic injection molded part: part design, tool building, material selection and manufacturing. Each section contains the most important aspects of each stage in the manufacturing cycle along with some helpful charts and diagrams.
What is the injection molding process theory -dgmf mold clamps co., ltdJasmineHL
The nature of friction between macromolecules when molten plastic flows is called the viscosity of plastics, and the coefficient of this viscosity is called viscosity, so viscosity is a reflection of the fluidity of molten plastics. The larger the viscosity, the stronger the melt viscosity. The worse the fluidity, the more difficult the processing.
Solutions to silver defects in injection molded parts -dgmf mold clamps co., ltdJasmineHL
Silver pattern: The needle-like silvery-white frost-like fine lines on the surface of the injection molded part. The direction of the opening is along the direction of the flow. Where the plastic part is not completely filled, the front end of the fluid is rough Silk pattern).
Influence of injection molding process on product quality -dgmf mold clamps c...JasmineHL
During the molding process of converting plastic particles into plastic products, plastics are often subjected to high temperature and high pressure and flow molding at high shear rates. Different molding conditions and processes will have different effects on product quality. Plastic injection molding has plastics. Raw materials, injection molding machines, molds and injection molding processes are composed of four aspects.
Basic requirements for plastic injection molded part designJasmineHL
Plastic Part Design Basic Requirements
Unreasonable design of plastic injection molded parts often results in some inherent defects in the product. For example, the structure of the parts is unreasonable, the parts use too much material, etc. Here are a series of basic requirements for plastic injection molded parts design for reference.
1. Causes of dents
1.1 The thickness of each part of the product is different
1.2 Insufficient pressure inside the mold
1.3 Insufficient mold cooling
1.4 Deformation due to the insufficient cooling time
Reasonable product design and mold design are key technologies that affect the success of injection molding. This article introduces some basic principles of injection molded product design and mold design.
1. The basic conditions of plastic product design
1.1. Record the product usage conditions as detailed as possible.
These conditions are:
A. Use environment
Outdoor conditions (sunlight, rain, ice, snow, dust), sunlight (ultraviolet rays, radiation, etc.), contact with gas (corrosive gas, water vapor), contact with liquid (water, detergent, oil, medicine, etc.), other (plasticizers), copper);
B. Use intensity
Common temperature, maximum temperature, minimum temperature (usually, special circumstances, outdoor, warehouse, window, car, etc.), repeated cold and hot
C. Use load
Common load, maximum load (normal, special circumstances. Static, dynamic, repeated, continuous, impact, drop, etc.).
What are the key points of precision injection moldingJasmineHL
Precision injection molding is affected by many related factors and environmental conditions, and the most basic are the four basic factors of plastic materials, injection molds, injection molding processes, and injection molding equipment.
In the early stage of designing plastic products, engineering plastics with corresponding performance requirements should be selected according to the application environment.
Secondly, the appropriate injection molding machine should be selected according to the selected plastic material, finished product dimensional accuracy, part weight, quality requirements, and expected mold structure.
Injection mold is a tool for producing plastic products; it is also a tool for giving plastic products a complete structure and precise dimensions. The structure of the injection mold and the quality of mold processing directly affects the quality and production efficiency of plastic parts. The most common and most common causes of injection mold failures and troubleshooting methods in the production of injection molds and plastic products are described in detail as follows:
In a sense, the injection mold is also a replacement device, that is, the plastic melt enters the mold cavity and simultaneously replaces the air in the mold cavity. In fact, the air in the mold is not limited to the cavity, especially the three-plate injection mold, and the air in the flow channel cannot be ignored. In addition, the plastic melt will produce a small amount of decomposition gas. These gases must be exhausted in time.
Five elements of injection molding process parametersJasmineHL
The injection molding process is one of the four major plastic molding processes. The barrels, basins, toys, and other daily products we use in our lives are all formed by the injection molding process. So what are the important factors to pay attention to in the plastic injection molding process?
The completion of the injection molding process generally requires six processes of clamping, filling, holding pressure, cooling, demolding, and opening the mold. In these six processes, we must remember these five elements, namely pressure, speed, position, temperature, and time.
How to solve the profile problem of injection molded parts -dgmf mold clamps ...JasmineHL
Generally speaking, automotive series components, and some parts with sealing requirements, usually put forward the concept of contour size requirements.
This eBook is dedicated to all of the product designers and engineers who are tasked with creating perfect plastic parts. We have outlined four key factors that go into making a high-quality plastic injection molded part: part design, tool building, material selection and manufacturing. Each section contains the most important aspects of each stage in the manufacturing cycle along with some helpful charts and diagrams.
18 Basic Injection Molding Technologies
Below are the 18 basic injection molding technologies that injection molding technicians must know.
01. Nozzle in the injection molding technologies
The melt usually flows from the nozzle into the nozzle, but in some injection molds, the nozzle is part of the mold because it extends to the bottom of the mold. There are also two main types of nozzles: open nozzles and closed nozzles. In injection molding, open nozzles should be used more because they are cheaper and less likely to stay.
If the injection molding machine is equipped with a pressure-removing device, this nozzle can be used even for low-viscosity melts. Sometimes a closed nozzle must be used. This nozzle acts as a stop valve to block the plastic in the injection cylinder.
Make sure that the nozzle is correctly connected to the nozzle bushing, and the top hole is slightly smaller than the nozzle sprue bushing, which makes the nozzle easier to withdraw from the injection mold. The hole of the nozzle sleeve is 1mm larger than the nozzle, that is, the radius of the nozzle is 0.5mm smaller than the radius of the nozzle sleeve.
Sheet metal process blanking -dgmf mold clamps co., ltdJasmineHL
Punching is a basic stamping process that uses a mold to separate materials. It can be directly made into flat parts or prepared for other stamping processes such as bending, deep drawing, forming, etc., and can also be cut, repaired on the formed stamped parts. Wait. The blanking process accounts for about 50% to 60% of the entire stamping process.
What is the injection molding cooling time -dgmf mold clamps co., ltdJasmineHL
In injection production, the cooling time of plastic injection molded parts accounts for about 80% of the entire injection production cycle. Poor cooling often results in warpage of the product or surface defects, affecting the dimensional stability of the product. Properly arranging injection, holding pressure and cooling time can improve product quality and productivity.
Compared with ordinary flow channel molds, hot runner mould have significant advantages such as saving time and materials, high efficiency, and stable quality. However, its wide application has been affected by their failure in use. With technological advancement of mold industry, hot runner mould has made great progress in flow channel melt temperature control, structural reliability, hot runner component design and manufacture, which makes hot runner technology regain people’s attention and favor.
Its very useful book for all the Mechanical Engineers, who are working production side and by this book we know the various types of gaskets and applications.
Similar to How to deal with sink marks on the surface of injection molded products (20)
Mold clamp tools definition
What is mold clamp? The mold clamp (also called mould clamp) is a kind of auxiliary clamping unit often used in injection mold processing, its main function is to keep the machined parts not shaking not moving in the processing.
What determines high performance plasticsJasmineHL
The following six factors determine the high-performance plastics.
(1) The type of polymer determines high-performance plastics
The performance is also different because of the different polymer links, such as acetal resin (POM) impact strength, then the unsaturated polyester resin (UP) is more excellent. Even if the same material, structure, and polymerization degree are different, the performance varies significantly.
What is mold temperature in injection molding?JasmineHL
The mold temperature in injection molding is probably the most important temperature in terms of quality and this affects quality in many ways. The mold temperature is not the same thing as the cooling water temperature, it is the temperature of the actual mold cavity after it has stabilized.
What is progressive stamping die?
Progressive stamping is a metalworking method that can encompass punching, coining, bending, and several other ways of modifying metal raw material, combined with an automatic feeding system. The feeding system pushes a strip of metal through all of the stations of a progressive stamping die.
The progressive stamping die refers to a cold stamping die that uses a strip of stamping raw material to complete multiple stamping processes simultaneously with several different stations on one die in one stamping stroke, and the material strip moves at a fixed distance once for each stamping stroke until the product is finished.
Mold components refer to the general name of metal accessories used in stamping dies, plastic molds, or FA automation equipment exclusively in the mold industry.
Here we are going to introduce 60 kinds of the mold components.
Precautions for injection mold maintenanceJasmineHL
Injection mold, as the most important production tool of injection molding factory, determines the shape, specification, size and appearance finish of the product. The material of the mold is steel, which is generally composed of a front mold and a back mold.
Plastic products are made of a mixture of synthetic resin and various additives as raw materials, using injection, extrusion, pressing, pouring, and other methods. While plastic products are being molded, they also obtain the final performance, so plastic molding is a key production process.
The following are 10 common plastic Injection molding methods.
The cold forging, cold extrusion, and cold heading are general terms for plastic processing. Cold forging, also called cold volume forming, is a manufacturing process and a processing method. Cold forging is the forming process below the recrystallization temperature of the material, and the forging performed below the recovery temperature.
What is the difference between blow molding and injection moldingJasmineHL
What Is The Difference Between Blow Molding And Injection Molding?
First, the process is different
Blow molding: Blow molding uses gas pressure to inflate the hot parison closed in the mold into a hollow product, or the tube parison is inflated into a tube film without a mold.
Injection molding: injection molding is to melt plastic materials, and then inject them into the film cavity to form.
Blow molding is a manufacturing process for forming and joining together hollow plastic parts. It is also used for forming glass bottles or other hollow shapes. In general, there are three main types of blow molding: extrusion blow molding, injection blow molding, and injection stretch blow molding.
The inclined top mold is also known as the inclined tip. It is the mechanism used to mold the internal barbs of the product in the mold design. It is suitable for relatively simple barbs.
Appropriate opening of the injection mold air vent can greatly reduce the injection molding pressure, injection molding time, holding time, and injection mold clamping pressure, making the plastic parts from difficult to easy, thereby improving production efficiency, reducing production costs, and reducing the energy consumption of the machine.
How complex molds are demolded dynamic picturesJasmineHL
Today we will share with you a wave of dynamic pictures of how complex molds are demolded, including rotary core pulling, complex slider mechanisms, complex inclined top mechanisms, and so on. These dynamic pictures can be said to be the essence of a set of molds. We recommend everyone to collect them. They can really help everyone to increase their knowledge.
What is parting lock?
Parting lock is also called nylon mold clamp, resin shutter, nylon mold lock, resin mold clamp, nylon resin shutter, etc. It is a mold component that adjusts the friction between the template and the nylon sleeve by locking the tapered bolts.
What is the standard injection mold development process?JasmineHL
Before drawing the final assembly drawing of the mold, the process drawing should be drawn up, and it should meet the requirements of the workpiece drawing and process data. The size guaranteed by the next process shall be marked with the words "process size" on the drawing. If, after molding, no other machining is performed except for repairing burrs, the process drawing is exactly the same as the workpiece drawing.
8 issues to be noted when injection molding pet performsJasmineHL
Because PET macromolecules contain fat groups and have a certain degree of hydrophilicity, the pellets are more sensitive to water at high temperatures. When the moisture content exceeds the limit, the molecular weight of PET decreases during processing, and the products are colored and brittle.
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In this insightful webinar, Inflectra explores how artificial intelligence (AI) is transforming software development and testing. Discover how AI-powered tools are revolutionizing every stage of the software development lifecycle (SDLC), from design and prototyping to testing, deployment, and monitoring.
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How to deal with sink marks on the surface of injection molded products
1. www.moldclamps.net www.dgmfmoldclamps.com info@dgmfmoldclamps.com
Mob & Wechat: 0086-17322110281
DGMF Mold Clamps Co., Ltd
Jasmine HL info@moldclamps.net
Please browse our website or contact us for more articles, thank you.
How To Deal With Sink Marks On The Surface Of
Injection Molded Products?
1. Noun explanation
Uneven product wall thickness causes uneven surface shrinkage and sinks marks.
Figure 1 Schematic diagram of sink marks
2. Failure analysis and troubleshooting methods
1. Improper control of molding conditions. Properly increase the injection pressure and injection
speed, increase the compression density of the melt, extend the injection and pressure holding
time, compensate for the shrinkage of the melt, and increase the injection buffer volume. But the
holding pressure cannot be too high, otherwise, it will cause bumps.
If dents and sink marks occur near the gate, they can be solved by extending the holding time;
When the plastic part has a depression in the wall thickness, the cooling time of the plastic part
in the mold should be appropriately extended;
If the dents and sink marks around the insert are caused by the partial shrinkage of the melt, this
is mainly caused by the temperature of the insert being too low, try to increase the temperature
2. www.moldclamps.net www.dgmfmoldclamps.com info@dgmfmoldclamps.com
Mob & Wechat: 0086-17322110281
DGMF Mold Clamps Co., Ltd
Jasmine HL info@moldclamps.net
Please browse our website or contact us for more articles, thank you.
of the insert;
If the surface of the plastic part is sunken due to insufficient material supply, the amount of
material supplied should be increased. In addition, the cooling of the plastic part in the mold
must be sufficient.
2. Mold defects. According to the specific situation, appropriately expand the gate and runner
cross-section, and set the gate position as symmetrically as possible, and the feed port should be
set in the thick wall of the plastic part.
If dents and sink marks occur far away from the gate, it is generally due to poor flow of melt in a
certain part of the mold structure, which hinders pressure transmission.
In this regard, the structural size of the mold gating system should be appropriately expanded,
and it is best to extend the runner to the recessed part. For wall-thick plastic parts, wing gates
should be preferred.
3. The raw materials do not meet the molding requirements. For plastic parts with relatively high
surface requirements, resins with low shrinkage rates should be used as much as possible, and an
appropriate amount of lubricant can also be added to the raw materials.
4. The shape and structure design of plastic parts is unreasonable. When designing the shape and
structure of plastic parts, the wall thickness should be as consistent as possible. If the wall
thickness of the plastic part is different, it can be solved by adjusting the structural parameters of
the gating system or changing the wall thickness distribution.
3. www.moldclamps.net www.dgmfmoldclamps.com info@dgmfmoldclamps.com
Mob & Wechat: 0086-17322110281
DGMF Mold Clamps Co., Ltd
Jasmine HL info@moldclamps.net
Please browse our website or contact us for more articles, thank you.
Figure 2 Changing the wall thickness to reduce sink marks
