Injection Molding Plastic Products Manufacturer

Speciallized in custom-made injection molded plastic products.

What We Can Make

Our customizable plastic products

Haixin's Differentiated Process Can Save 30%--50% VS. other plastic suppliers

Haixin's Differentiated Process Can Save 30%--50% VS. other plastic suppliers

High Quality

We are ISO 9001:2008 certified, and our process quality systems ensure that your parts are the highest quality possible for your application.

High Quality

We are ISO 9001:2008 certified, and our process quality systems ensure that your parts are the highest quality possible for your application.

Low Cost

We have our own mould factory to reduce the tooling cost.And have enough materials in stocks to keep the price stabilization.

Low Cost

We have our own mould factory to reduce the tooling cost.And have enough materials in stocks to keep the price stabilization.

High Precision

Comply with the DIN16742 standard tolerances for plastic injection moldings.

High Precision

Comply with the DIN16742 standard tolerances for plastic injection moldings.

Quick Quotes

Once upon recived your 3D drawing,we will offer our quotation within 24hours.

Quick Quotes

Once upon recived your 3D drawing,we will offer our quotation within 24hours.

About Haixin and custom plastic injection molding parts

About Haixin

About Haixin and custom plastic injection molding parts

About Haixin

About Service Offer Procedures

Kevin Pierce

USA

“ Impressed by their professional plastic parts and moulds, intelligent production standards, full cycle visual process. So far Haixin is my best choice! ”

“

“ Impressed by their professional plastic parts and moulds, intelligent production standards, full cycle visual process. So far Haixin is my best choice! ”

Kevin Pierce

USA

Our Equipment&Mold Introduction

Multiple-Cavity Molds (Family Molds)

Family molded parts

In addition to a single plastic part being produced in a molding cycle, the mold can also be designed to produce multiple numbers of the same part in a single shot. A tool with one impression is often called a single impression (cavity) mold, whereas a custom injection mold with two or more cavities of the same part is referred to as a multiple impression (cavity) mold. The number of impressions in the mold is often incorrectly referred to as cavitation. Some extremely high-volume molds – like those for bottle caps – can have over 128 cavities.

A multiple impression (cavity) mold may also be referred to as a “family” mold. However, a family mold is more accurately defined as one which can produce multiple, like-sized parts in the same quantity, color and material. Family molded parts are often part of an assembly, such as a mating top half and bottom half.

Overmolding

Overmolding is a plastic injection molding process which is very useful for producing multi-material parts with some unique properties. For instance, this process can be used to add a second part, of a different material, for a handle or grip. Picture a power tool with a grip made out of a softer material than the body of the tool. Similarly, a game controller can be manufactured with different textures of plastics on the body of it.

Basically, a previously injection molded part of one material (the substrate) is re-inserted into an injection molding machine, and a different material (the overmold) is injected to form a new layer over the first part.

Basically, a previously injection molded part of one material (the substrate) is re-inserted into an injection molding machine, and a different material (the overmold) is injected to form a new layer over the first part.

Overmolding is not as straightforward as injection molding a part out of a single material, and it is not without its limitations. One consideration is that the two materials must be compatible, chemically and thermally. Since plastic materials have different melt temperatures, the substrate material must have a higher melt temperature than the overmolding material, otherwise the original part would melt and deform when the overmolding material is injected.

Insert Molding

Metal, ceramic or plastic pieces can be inserted into the molten thermoplastic to form multi-material, robust parts with additional functionality. For example, threaded metal inserts can be molded into the parts to allow them to be attached to other parts.

Insert molding can reduce cost by embedding secondary parts into the plastic injection molding process, as opposed to installing the parts after molding. By integrating the inserts at the time of molding, the parts become more robust compared to staking the pieces in post-molding. Of course, the insert pieces must be able to withstand the high temperature and pressure of the injection molding process.

Insert molding is naturally a more complex process that standard injection molding, so some injection molding companies are more experienced in the process than others. For low-volume production runs, a machine operator may load the inserts into the mold by hand, prior to the plastic injection cycle. For high-volume production runs, however, it is common to use automated machinery to place the inserts into the mold.

Injection Molding and process

Injection molding is the most common modern method of manufacturing plastic parts. It is used to create a variety of parts with different shapes and sizes, and it is ideal for producing high volumes of the same plastic part. Injection molding is widely used for manufacturing a variety of parts, from the smallest medical device component to entire body panels of cars. A manufacturing process for producing plastic parts from both thermoplastic and thermosetting materials, injection molding can create parts with complex geometries that many other processes cannot.

The first step of getting a plastic part injection molded is to have a computer-aided design (CAD) model of the part produced by a design engineer. The three-dimensional (3D) CAD model then goes to an injection molding company where a mold maker (or toolmaker) will make the mold (tool) that will be fitted into an injection molding machine to make the parts.

The part cools and hardens to the shape of the mold cavity. Then the two halves of the mold (cavity or “A” side and core or “B” side) open up and ejector pins push the part out of the mold where it falls into a bin. Then the mold halves close back together and the process begins again for the next part.

Molds are precision-machined usually from steel or aluminum, and can become quite complex depending on the design of the part. Plastic materials shrink at different rates when they cool, so the mold has to be constructed with consideration for the shrinkage rate of the material being used for the parts. In other words, a formula is applied in the construction of the mold to slightly increase the size so that when the plastic shrinkage occurs, the part will be to the dimensional specifications of the CAD model.

Plastic injection molding is a manufacturing process where resin in a barrel is heated to a molten state, then shot into a mold to form a part in the shape of the mold. The resin begins as plastic pellets, which are gravity fed into the injection molding machine through a funnel-shaped hopper. The pellets are fed from the hopper into a heated chamber called the barrel where they are melted, compressed, and injected into the mold’s runner system by a reciprocating screw.

As the granules are slowly moved forward by a screw-type plunger, the melted plastic is forced through a nozzle that seats against the mold sprue bushing, allowing it to enter the mold cavity through a gate and runner system. The injection molded part remains at a set temperature so the plastic can solidify almost as soon as the mold is filled.

Plastic Injection Molds

Injection molds, or mold tooling, are the formed halves that come together in the injection molding machine to be filled with molten plastic and produce the plastic parts in their image. The cavity side, or “A” side, is typically the half which will form the “best” surface of the part, and the core side, or “B” side, will typically show the visual imperfections caused by ejector pins because the parts get ejected from this half.

Injection molds are manufactured by machining or by Electrical Discharge Machining (EDM). Standard machining was the traditional method of building injection molds with a knee mill. Technology advanced the process, and Computer Numerical Control (CNC) machining became the predominant method of making complex molds, with more accurate details, and in less time than the traditional method.

EDM is a process in which a shaped, copper or graphite electrode is slowly lowered onto the mold surface, which is immersed in paraffin oil. Electric voltage applied between the tool and the mold causes spark erosion of the mold surface in the inverse shape of the electrode. EDM has become widely used in mold making – many injection mold companies now have EDM in-house. The process allows the formation of molds which are difficult to machine, such as those with features such as ribs or square corners. It allows pre-hardened steel molds to be shaped without requiring heat treatment.

Compared to other plastic manufacturing processes such as CNC machining or 3D printing, injection molding has a high up-front investment because the tooling is expensive. However, for large production runs of thousands or even millions of identical parts, injection molding is typically less expensive in the long run, despite the high initial tooling investment, because of a lower piece price at high volumes. In addition, it is a much faster manufacturing process than the others mentioned.

Molds can be made of pre-hardened steel, steel that is hardened after the mold is produced, aluminum, and/or beryllium-copper alloy. The choice of mold material is determined in part by the number of parts to be produced.

Steel molds will generally have a longer lifespan, so a higher initial cost will be offset by longevity – it will be capable of producing a higher number of parts before wearing out. Pre-hardened steel injection molds are less wear-resistant than those hardened by heat treatments after they are machined, so they are used for lower volume part requirements.

Depending on varying economic conditions and material origin, aluminum molds can in some cases cost substantially less than steel molds. Aluminum molds have a quick build time, and can produce faster cycle times because of better heat dissipation than steel. Beryllium copper can also be used in areas of the injection molds that require fast heat removal, or in areas where the most shear heat is generated.

Additional complexity can be added to injection molds in order to produce more complex plastic parts. In the basic process of injection molding, the two mold halves separate at the end of the molding cycle and the part is ejected. In this simple case, the part design cannot have any overhanging or undercut part features, because the mold halves would catch on each other when pulling apart.

So, to accommodate part features such as undercuts, molds can be augmented with side-pull mechanisms called slides. Slides move into a cavity in a perpendicular direction from the draw of the mold halves to form the undercut feature, then stationary angle pins on the stationary mold half pull the slides away when the mold is opened. The pins enter a slot in the slides, and cause them to move backward when the moving half of the mold opens, like a cam. Then the part is ejected, the mold closes, and the slides move forward along the angle pins as a result of the closing action of the mold.

Custom Plastic Components

Plastic injection molding is a manufacturing process where raw thermoplastic polymers, in the form of resin, are melted and injected into a mold cavity. After the plastic cools and hardens, the mold is opened to remove the plastic components. Injection molding is a versatile form of plastic component fabrication that is used for a range of products including containers and packaging, toys, automotive components, and more. It is ideal for high volume production runs and the fabrication of detailed intricate parts.

The decision of choosing plastic components over metal or other materials depends on the design and intended used as well as required strength, wear resistance, heat resistance, and secondary operations that may be applied to the product. For many components, plastic is an excellent alternative that is less expensive by volume and provides several benefits including:

Injection molding is used to create many things such as wire spools, packaging, bottle caps, automotive parts and components, pocket comb, some musical instruments (and parts of them), one-piece chairs and small tables, storage containers, mechanical parts (including gears), and most other plastic products available today. Injection molding is the most common modern method of manufacturing plastic parts; it is ideal for producing high volumes of the same object.

HAIXIN utilizes a wide range of plastic materials to fabricate custom plastic components. Each material carries different advantages and should be chosen based on your application requirements. Some key things to consider when choosing a plastic material include:

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production experience

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10000+

Served Companies

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Reasonable

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Technical Team

“Delighted to sign a big contract with Haixin, who owns advanced production and measurement equipment, mature mold making technology.”

Сергей Sergey

Russia

“

“Delighted to sign a big contract with Haixin, who owns advanced production and measurement equipment, mature mold making technology.”

Сергей Sergey

Russia

‘It’s amazing to witness their varied mold and injection molded parts in high quality and less time.They have right to speak in unique complex expertise and highly technical tooling&molding program.”

Lionel Suarez

UK

“

‘It’s amazing to witness their varied mold and injection molded parts in high quality and less time.They have right to speak in unique complex expertise and highly technical tooling&molding program.”

Lionel Suarez

UK

FAQs

Material Options

Provides a high strength-to-weight density ratio and resistance to a variety of solvents. HDPE is widely used for items such as plastic bottles, food storage containers, outdoor furniture, and piping.

A lightweight, yet strong plastic that often has plasticizers added to increase softness and flexibility. PVC is frequently used for construction, automotive and electronics applications, and in medical devices.

A tough plastic that provides resistance to impact and high temperatures. It is one of the most commonly injection molded plastics used for 3D manufacturing and the fabrication of OEM parts.

It is low friction, easily machinable and impact resistant. Acetal is often used for the fabrication of gears, electrical components, furniture hardware, and automotive components.

A chemical-resistant material that provides toughness, elasticity, fatigue resistance and insulation. Commonly used for electronic components.

provides high tensile strength and elasticity and is resistant to chemicals and abrasion. These plastic materials are used for applications that require high mechanical strength, rigidity and stability. Common uses include automotive components, pipes and machine parts.

A strong, stiff, high-performance plastic that provides dimensional stability and chemical resistance. It is used for electronic, electrical and automotive applications.

A naturally transparent thermoplastic that can transmit light and withstand impact. This material is often used for windows, lighting fixtures, eyeglasses, medical devices and automotive components.  

About Service Offer Procedures

Our Equipment&Mold Introduction

Injection Molding and process

Injection molding is the most common modern method of manufacturing plastic parts. It is used to create a variety of parts with different shapes and sizes, and it is ideal for producing high volumes of the same plastic part. Injection molding is widely used for manufacturing a variety of parts, from the smallest medical device component to entire body panels of cars. A manufacturing process for producing plastic parts from both thermoplastic and thermosetting materials, injection molding can create parts with complex geometries that many other processes cannot.

The first step of getting a plastic part injection molded is to have a computer-aided design (CAD) model of the part produced by a design engineer. The three-dimensional (3D) CAD model then goes to an injection molding company where a mold maker (or toolmaker) will make the mold (tool) that will be fitted into an injection molding machine to make the parts.

Molds are precision-machined usually from steel or aluminum, and can become quite complex depending on the design of the part. Plastic materials shrink at different rates when they cool, so the mold has to be constructed with consideration for the shrinkage rate of the material being used for the parts. In other words, a formula is applied in the construction of the mold to slightly increase the size so that when the plastic shrinkage occurs, the part will be to the dimensional specifications of the CAD model.

Plastic injection molding is a manufacturing process where resin in a barrel is heated to a molten state, then shot into a mold to form a part in the shape of the mold. The resin begins as plastic pellets, which are gravity fed into the injection molding machine through a funnel-shaped hopper. The pellets are fed from the hopper into a heated chamber called the barrel where they are melted, compressed, and injected into the mold’s runner system by a reciprocating screw.

As the granules are slowly moved forward by a screw-type plunger, the melted plastic is forced through a nozzle that seats against the mold sprue bushing, allowing it to enter the mold cavity through a gate and runner system. The injection molded part remains at a set temperature so the plastic can solidify almost as soon as the mold is filled.

The part cools and hardens to the shape of the mold cavity. Then the two halves of the mold (cavity or “A” side and core or “B” side) open up and ejector pins push the part out of the mold where it falls into a bin. Then the mold halves close back together and the process begins again for the next part. 

Plastic Injection Molds

Injection molds, or mold tooling, are the formed halves that come together in the injection molding machine to be filled with molten plastic and produce the plastic parts in their image. The cavity side, or “A” side, is typically the half which will form the “best” surface of the part, and the core side, or “B” side, will typically show the visual imperfections caused by ejector pins because the parts get ejected from this half.

Injection molds are manufactured by machining or by Electrical Discharge Machining (EDM). Standard machining was the traditional method of building injection molds with a knee mill. Technology advanced the process, and Computer Numerical Control (CNC) machining became the predominant method of making complex molds, with more accurate details, and in less time than the traditional method.

EDM is a process in which a shaped, copper or graphite electrode is slowly lowered onto the mold surface, which is immersed in paraffin oil. Electric voltage applied between the tool and the mold causes spark erosion of the mold surface in the inverse shape of the electrode. EDM has become widely used in mold making – many injection mold companies now have EDM in-house. The process allows the formation of molds which are difficult to machine, such as those with features such as ribs or square corners. It allows pre-hardened steel molds to be shaped without requiring heat treatment.

Compared to other plastic manufacturing processes such as CNC machining or 3D printing, injection molding has a high up-front investment because the tooling is expensive. However, for large production runs of thousands or even millions of identical parts, injection molding is typically less expensive in the long run, despite the high initial tooling investment, because of a lower piece price at high volumes. In addition, it is a much faster manufacturing process than the others mentioned.

Molds can be made of pre-hardened steel, steel that is hardened after the mold is produced, aluminum, and/or beryllium-copper alloy. The choice of mold material is determined in part by the number of parts to be produced.

Steel molds will generally have a longer lifespan, so a higher initial cost will be offset by longevity – it will be capable of producing a higher number of parts before wearing out. Pre-hardened steel injection molds are less wear-resistant than those hardened by heat treatments after they are machined, so they are used for lower volume part requirements.

Depending on varying economic conditions and material origin, aluminum molds can in some cases cost substantially less than steel molds. Aluminum molds have a quick build time, and can produce faster cycle times because of better heat dissipation than steel. Beryllium copper can also be used in areas of the injection molds that require fast heat removal, or in areas where the most shear heat is generated.

Additional complexity can be added to injection molds in order to produce more complex plastic parts. In the basic process of injection molding, the two mold halves separate at the end of the molding cycle and the part is ejected. In this simple case, the part design cannot have any overhanging or undercut part features, because the mold halves would catch on each other when pulling apart.

So, to accommodate part features such as undercuts, molds can be augmented with side-pull mechanisms called slides. Slides move into a cavity in a perpendicular direction from the draw of the mold halves to form the undercut feature, then stationary angle pins on the stationary mold half pull the slides away when the mold is opened. The pins enter a slot in the slides, and cause them to move backward when the moving half of the mold opens, like a cam. Then the part is ejected, the mold closes, and the slides move forward along the angle pins as a result of the closing action of the mold.

Multiple-Cavity Molds (Family Molds) 

Multiple-Cavity Molds (Family Molds)

Family molded parts

In addition to a single plastic part being produced in a molding cycle, the mold can also be designed to produce multiple numbers of the same part in a single shot. A tool with one impression is often called a single impression (cavity) mold, whereas a custom injection mold with two or more cavities of the same part is referred to as a multiple impression (cavity) mold. The number of impressions in the mold is often incorrectly referred to as cavitation. Some extremely high-volume molds – like those for bottle caps – can have over 128 cavities.

A multiple impression (cavity) mold may also be referred to as a “family” mold. However, a family mold is more accurately defined as one which can produce multiple, like-sized parts in the same quantity, color and material. Family molded parts are often part of an assembly, such as a mating top half and bottom half.

Overmolding

Overmolding is a plastic injection molding process which is very useful for producing multi-material parts with some unique properties. For instance, this process can be used to add a second part, of a different material, for a handle or grip. Picture a power tool with a grip made out of a softer material than the body of the tool. Similarly, a game controller can be manufactured with different textures of plastics on the body of it.

Basically, a previously injection molded part of one material (the substrate) is re-inserted into an injection molding machine, and a different material (the overmold) is injected to form a new layer over the first part.

Basically, a previously injection molded part of one material (the substrate) is re-inserted into an injection molding machine, and a different material (the overmold) is injected to form a new layer over the first part. 

Overmolding is not as straightforward as injection molding a part out of a single material, and it is not without its limitations. One consideration is that the two materials must be compatible, chemically and thermally. Since plastic materials have different melt temperatures, the substrate material must have a higher melt temperature than the overmolding material, otherwise the original part would melt and deform when the overmolding material is injected.

Insert Molding 

Metal, ceramic or plastic pieces can be inserted into the molten thermoplastic to form multi-material, robust parts with additional functionality. For example, threaded metal inserts can be molded into the parts to allow them to be attached to other parts.

Insert molding can reduce cost by embedding secondary parts into the plastic injection molding process, as opposed to installing the parts after molding. By integrating the inserts at the time of molding, the parts become more robust compared to staking the pieces in post-molding. Of course, the insert pieces must be able to withstand the high temperature and pressure of the injection molding process.

Insert molding is naturally a more complex process that standard injection molding, so some injection molding companies are more experienced in the process than others. For low-volume production runs, a machine operator may load the inserts into the mold by hand, prior to the plastic injection cycle. For high-volume production runs, however, it is common to use automated machinery to place the inserts into the mold.

Custom Plastic Components

Plastic injection molding is a manufacturing process where raw thermoplastic polymers, in the form of resin, are melted and injected into a mold cavity. After the plastic cools and hardens, the mold is opened to remove the plastic components. Injection molding is a versatile form of plastic component fabrication that is used for a range of products including containers and packaging, toys, automotive components, and more. It is ideal for high volume production runs and the fabrication of detailed intricate parts.

The decision of choosing plastic components over metal or other materials depends on the design and intended used as well as required strength, wear resistance, heat resistance, and secondary operations that may be applied to the product. For many components, plastic is an excellent alternative that is less expensive by volume and provides several benefits including:

Easy to form and machine 

Provides strength and durability

  Available in various colors

 Requires little to no finishing

Has a faster production time

 Is a lightweight material

Custom Plastic Parts Manufacturing Using a Range of Materials and Processes

Provides resistance to chemicals and corrosion