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How to Select a Suitable Mold Steel for the Injection Moulds

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How to Select a Suitable Mold Steel for the Injection Moulds

Different mold steel has different performance, so different injection moulds use different steel. The question is how to select the suitable steel for the injection moulds?

Mold steel is divided into cold die steel , hot die steel, and plastic mold steel, be used to forging, punching, cutting, die-casting, etc.

For some import pre-harden mold steel, such like DIN1.2311, DIN1.2738, NAK80. The steel factory hardness can reach HRC32-40. They have high polish performance, deformation resistance, and pressure resistance. They widely used to table mould, large box mould, auto part mould, etc.

Domestic pre-harden steel, SC45#, SC50#, SC60#, P20, 718, P20H, 718H. The factory hardness is HRC32-37. They can be use directly, and also can be make harden treatment if there has more hardness requirement. Such like nitridation, heat treatment.

However, there are some mold steel that don’t have any hardness when the injection moulds maker got it. Import steel, DIN1.2344, DIN1.2316, H13, S136, S420, and mold steel made in China, 2316, S136, H13, 3Cr13, 4 Cr13, etc, they all need to quenching or nitriding to reach the necessary hardness after rough machining. The steels are stainless, suitable for rubber injection moulds that needs corrosion resistance.

According to our mould manufacturing experience, most packaging mould, such like preform mould, cap mould, thin wall container mold, syringe molds, cutlery mold, PVC mold, etc. They                                                                       are normally made by high quality mould steel, S136, DIN1.2316. The similar feature of this mould is that they all have high output requirement, and stainless steel. These steel can guarantee a longer mould life than other general steel.

DIN1.2738, 718H, H13 is widely use for home appliance mold, commodity mold, auto part mold. For example, battery box mold, helmet mold, bucket plastic molds, thick container mold, etc.

For some large plastic mold, such like industry use bin mould, pallet mold, panel mold, multi crate mold, table mold, chair mould, bumper mould, etc. Because the most mould cost is on the steel, so customers will select P20 for the mould core and cavity. Besides, they easy machining than harder steel.

SC 45# is normally use for injection moulds base. Sometimes, it also use for some large mould core and cavity when customer doesn’t has longer mould lifer requirement.

When you are select the mold steel for your injection moulds, we kindly suggest you that, it is not the harder the better, or the expensive the better. You need to select a suitable mold steel for the injection moulds.

Plastic Box Mold

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Do you looking for plastic box mold?

If so, I would introduce you a plastic box molding company who has been in the industry for over 20 decades – DongGuan Sincere Tech Co.ltd.

Founded in 2005, ST has cultivated a production team of comprehensive technology and rich experience. ST now is proudly to be one of Famous Mold Manufacturer China Suppliers.ST works on various kinds of plastic box mold, such as crate mould, pallet mould, beer and bottle box mould, storage box mould, folding box mould and so on.

Not only this type of plastic molds which SINCER ETECH makes, but also automobile molds and all other custom plastic molds, please go to https://www.plasticmold.net/plastic-mould/ to get more detail info.

plastic box mold making si same processing like other type of plastic molds making, here  are some procedues to let you know the basic information about plastic molds making, no matter automobile mold, toy mold, home appliances molds. car molds, household molds, plastic box molds etc, all the manufacturing p

rocess will be the same,The making a custom plastic molds involves a series of steps listed below, this is only A general procedure.

  1. Part design and mold structure analysis, then come to mold design process by using AUTOCAD or UG software.
  2. Mold manufacturing by using CNC,EDM, wire-cut, milling,polishing process and so on.
  3. Mold fitting and assembling the mold. Up to this step, the most important job has been done. A mold has been made.
  4. Mold trial process: Introduction of the plastic material in the heated chamber. The plastic material is mainly in the form of pellets which are liquefied by the high temperatures in the chamber.
  5. The liquefied material is allowed to flow into the mold that is used to make the plastic molding parts. It is commonly referred to as the shot.
  6. The material is allowed to cool and solidify while in the injection mold. Temperature can be regulated by using of cold water pipes or oil pipes. This is to cool or lower the temperatures to facilitate faster cooling of the molds.
  7. The plastic molding parts are then forced out of the mould once they fully solidify, the mold closes and the process is repeated, this repeated processing we called massive production.

The future of plastic molding

  Plastic molding is advancing over the years. The thinnest materials that the first injection molding machine could make were about 2.5 mm and the capacities of the discs was less than 1 GB. With advancement in technology, molds being made today can be as thin as 0.5 mm and can

hold 20 GB. Today, many molding companies are specializing in the production of particular parts in order to increase the quality of molds being produced. The increased number of companies in the business of plastic molding are increasing. This is expected to result in a drop in the prices of plastic molds in the future. It is also anticipated that companies will start using non-plastic materials for making molds in several years to come.

There are different kinds of plastic molds and plastic molding parts depending on the method you use to make them, this is depending on your requirement projects. go to https://www.plasticmold.net/ and send us your requirement, we review your part design and quote you a competitive price. If you are traveling in China we would like to invite you to visit our factory.

If want to know more about plastic box mold, please go to https://en.wikipedia.org/wiki/Plastic_Box, hope this will help you.

Over Molding

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Overmolding and over molding

Over-mold injection molding , th eprocess is the same as insert molding, where an existing component is loaded into a mold and plastic is molded around it to create a multi-material single part. Insert-molding is most synonymous with combining metal components with plastic in such products as electrical pin connectors. When the term over-molding is used, the metal component is simply replaced with a previously molded plastic part. Single-shot injection molding machines are used to produce both the plastic component and the over-molded plastic. Tooling for injection over-mold injection molding requires two molds; one for the plastic component and one for the over-mold. Over-mold injection molding requires labor to handle the plastic component and load it into the second mold. Over-molding is generally reserved for higher priced parts that can absorb higher machine time and labor costs.

If you are planning to go into a plastic molding business, you should first know the different processes. Choose from a plastic molding process that fits your budget, your expertise, and your resources. In Injection Molding, melted plastic is forced into a mold cavity. Once cooled, the mold can be removed. This plastic molding process is commonly used in mass-production or prototyping of a product. Injection molding machines were made in the 1930’s. This can be used to mass produce toys, kitchen utensils, bottle caps, and cell phone stands to name a few. Plastic molding is a very technical process. It needs experts in this type of manufacturing business for it to be competitive in the market. Therefore, a very scientific and systematic study should be first made before going into this endeavor.

plastic molding | Plastic injection mold

Injection molding is an effective way to make custom parts. Granules of plastic are melted down and then injected into a metal mold; there the molten plastic hardens into a designated shape. Then you open the mold and a new part is removed, inspected and is ready to go. Injection molding is an incredibly versatile form of molding plastics. As with everything, injection molding has its ups and down so it is important that the ends justify the means for your project needs. There are three main components in the injection molding process. The injection apparatus itself which melts and then transmits the plastic, the mold, which is custom designed, and clamping to provide controlled pressure.

Thermoplastic injection molding is molding the most widely used of all plastic processing methods. The injection molding machine reduces pelletized raw material and colorants into a hot liquid. This “melt” is forced into a cooled mold under tremendous pressure. After the material solidifies, the mold is unclamped and a finished part is ejected. Injection molding offers the lowest piece prices available, but tooling prices are generally the highest. Thermoset injection molding is similar to thermoplastic injection molding except that uncured thermoset resins are mixed, injected, and held in the mold until cured. As with thermoplastic molding, the price per piece can be low, but the tooling prices are generally very high.

Purchasing the box, some assorted socket rails, and some additional clips for the socket rails, I took the box home with me to see how well it would stand up as a replacement. The box is quite simple in construction. It’s a plastic injection molded case made of a very thick plastic. The case consists of a flip open lid (with two latches that are padlock compatible) covering a deep top storage area, and three drawers that are very similar to the large rolling tool chests that many professionals and advanced amateur home mechanics have in their garages. When you flip the lid open, the lid will immediately release the latching mechanism for the three drawers. Unfortunately, the lid does not contain any hinges or tethering that prevent it from flopping open and hitting itself on the back of the tool box. This was my only gripe involving the tool box.

Do you want to know more information about overmolding and insert molding? If so please go to our double injection molding site by https://www.plasticmold.net/double-injection-molding/, there are more information for you.

Injection Molding Process

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Process of Injection Molding

The process of injection molding process is best explained as heating up a type of plastic and under a forced type or pressure is poured into a predesigned mold, after the hot liquid is poured into the mold the mold is clamped shut to prevent any air from getting in. After the initial work is done, the mold hardens and takes the shape of the mold.

Then the next step in the process is when the resin (hard plastic) which is now in the shape of a small pellets are poured into the feed hopper, the hopper is a large open bottomed contained and what it does is that is filters the pellets into the screw.

As the screws turn the resin pellets are moved into the screw and then they go through a very intense pressure. Then friction is created and when that happens heat is generated to melt the pellets. There are heaters on both sides of the screws and there is temperature control during the melting process.

The oil gets pumped from the tank to the injection molded parts that run along the tie bar equipment, then that’s when the liquid plastic gets injected into the mold. Then the water-cooling technique is applied in assist in cooling off the mold. The process is complete when the mold is pulled from the pre-designed mold.

Used Injection Molding Machines

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Used Injection Molding Machines

There are constantly new techniques and new technology in the industrial world of injection molding. New machines, new plastics, new equipment. There are some companies that keep up with other companies by buying a lot of expensive equipment the second it comes out.

But these are the companies that cost so much because they have to charge more to pay for the price of the new equipment they just bought. But then you have the companies that like to keep using used machinery because they are just as good as new and as the old saying goes if it isn’t broke don’t fix it. Not every company wants to be the fancy company with all new machines.

Some companies want to just be known as the company that did my job in the most outstanding way. They want the recognition for a job well done rather than for the company who spend a lot of money on a piece of new machinery.

Companies that keep using used machinery don’t have to increase their prices and customers like to see that and they will keep coming back to the company that does great work for a great price.

How Injection Molding Works

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How Injection Molding Works

In this post I’m going to explain how injection molding works. Creating polymers is an amazing process. Then there is the question of forming the plastic or rubber into useful objects….another fantastic discipline. One of the most common methods of forming rubber or plastic resins is a process called injection molding. Injection molding is made possible by large machines called injection molding machines.

Material, either rubber or plastic resin is fed to the machine. This can be in the form of a hopper for plastic pellets or an auger for thicker, heavier compounds. Colorants are usually fed to the machine directly after the hopper. The resins enter the injection barrel by gravity though the feed throat. Upon introduction into the barrel, the resin is heated to the appropriate temperature to make it melt.

This now viscous material is injected into the mold by a reciprocating screw or a ram injector. A reciprocating screw provides the advantage of being able to inject a smaller percentage of the total shot1. The ram injector on the other hand, must typically inject at least 20% of the total shot. A screw injector can inject as little as 5% of the total shot. Many factors also come into play such as the type of mold, how the material is injected, etc., effect the shot.

The Plastic mold is a cavity in the machine that receives the material and shapes it accordingly. In order to make the injected material solidify, the mold is cooled constantly to a temperature which makes the solidification possible. The mold plates are forced together, usually by hydraulic force. The clamping force is defined as the injection pressure multiplied by the total cavity projected area. Molds are typically over-designed with regard to the pressures they must endure depending on the material to be cast. In addition, each injectionable material has a calculated shrinkage value associated with that has to be accounted for as well.

Some Typical Complications

Burned or Scorched Parts: Melt temperature may be too high. Polymer may be becoming trapped and degrading in the injection nozzle. Cycle time may be too long allowing the resin to overheat.

Warpage of Parts: Uneven surface temperature of the molds. Non-uniform wall thickness of mold design.

Surface Imperfections: Melt temperature may be too high causing resin decomposition and gas evolution (bubbles). Excessive moisture in the resin. Low pressure causing incomplete filling of mold.

Incomplete Cavity Filling: Injection stroke may be too small for mold (ie. not enough resin is being injected). Injection speed may be too slow causing freezing before mold is filled.

Contract Injection Molding

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Contract Injection Molding

When you are looking for a company to do a terrific job handling your custom injection molding contract. You want to make sure that they can cover your needs. If at all possible, tour the facility of where you are interested in having your work done. But you want to make sure their facility can handle the load.

You want a company that handles both a large and small volume of work. Some companies only will do a certain amount of work therefore they turn down small amount jobs. You want them to provide samples, you want to be able to see what kind of job they will do for you before you contract a huge order and do not like the work.

You want full production abilities, process optimization, and Insert molding and over molding, PPac capabilities. You also want packaging and domestic and international shipping capabilities. The company that you contract for your work, you want to handle the type of job you have for the price that you want.

That is why it is important to tour the facility to see first hand how the company will handle your job load. You want a guarantee that the job you give them will be nothing less than spectacular. This is what contract Plastic molding is all about.

Injection Molding Machines

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Injection Molding Machines

One type of injection molding machine is the Milacron LIM, Liquid Injection Molding; there are many benefits in having this machine over the traditional LIM. This machine has its own controls and especially made soft ware for this product only. It has a low pressure set up for injection setup and it has a closed loop control.

Unlike the traditional LIM this machine has an increased power ejector force, so it can inject the mold quicker. It has a standard injection screw, a cooling plate on both sides, eight new pneumatic valves, and two heat zones on each paten, a 3-stage air ejector. The improvements from the standard LIM also include a revised rear seal on the injector screw and also a revised seal that is on the nozzle.

These machines have a thermo set process that uses a silicone rubber material that is used to be injected into the heat plastic molds. The best part about these Milacron machines is that no other machine can use their software is designed just for their machines and no one else’s. The Milacron also has a complete design line of Fluid Auto meter mixers.

Milacron is one of the best in the business of injection molding and if your company needs to replace a machine, consider this one, it is one of the best.

Injection Molding Companies

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Injection Molding Companies

These are some of the top companies in the United States in the injection molding field. If you are looking for a great company with great reputations, check out these companies.

MOCAP, Inc, located in St. Louis, MO. They are a full service company; they are a manufacturer of standard and custom injection molding designs. They use all grades of plastic and they do a lot of volume and can handle as little or as much volume as needed.

Precision Tool & Die located in Derry, New Hampshire. They are an all purpose company, they provide custom manufacturing, service and a general manufacturer. They provide on site molding with perfect injection molds, they also do insert molds, transfer molds and they also do complete designs.

World Class Plastics located in Russell Point, Ohio, this company is also a custom manufacturer, a service and a manufacture company. Their company profile says they are QS9000 registered, they do custom thermoplastic injections, and they fabricate molds and tool design.

The G&F Industries located in Sturbridge, MA, they are a service and manufacture company. They are listed as an ISO 9000 certified company; they have a great reputation in the fabrication of injection Plastic Molding and plastic fabrications that use the injection molding process. They also use a robotic system and a real time production team.

Do you know any other injection molding companies that deserve to be mentioned here?

Injection Molding Glossary

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Injection Molding Glossary

Injection Molding: this is a technique used to fabricate parts made from thermoplastic materials.

Thermoplastic materials: are materials made out of plastic that are able to melt into a liquid when heated at a high enough heat and when it freezes it will be in a glassy state when it is cooled.

Polystyrene is a polymer that is a liquid hydrocarbon that is commercially made from petroleum.

Polypropylene is a very hard plastic that is used for many different uses such as food packaging, reusable containers and textiles. It is a very durable and rugged unusually.

Resin is comes from many plants especially from the Coniferous tree that is used for its chemicals. You can use resin for adhesives and incense and some perfumes.

Solidify is to become hard or firm.

Pellet is a small compressed piece of material or a substance.

Nylon is a chemically resistant, it is also heat resistant, but it is tough and very flexible.