PVC Injection Molding

PVC pipe fitting injection molding

PVC pipe fitting injection molding is a very common raw material injection molding process. It has advantages such as high efficiency, durability, and high precision. Due to its enormous advantages, PVC plastic injection molding is the preferred raw material for PVC pipes and PVC pipe joints or fitting. It has widely applied in threading, electrician, water drainage, communication, agricultural irrigation, firefighting, electric power and other fields

Five types of PVC pipe fitting.
PVC pipe fitting material: PVC= polyvinyl chloride.
PVC pipe fitting injection molding process.

How to Manufacture Plastic PVC pipe Fitting

5 steps to manufacture PVC pipe fitting:

Prepare the PVC material
Produce the mold for PVC pipe fitting
PVC fitting injection molding
Robot fetch and runner cutting
Packing PVC joints automatically

Step 1: Prepare the PVC material

The main raw material for PVC pipe fitting is polyvinyl chloride (PVC) resin, a white powdery material with semi-transparent and glossy characteristics.

In the production of PVC pipe fitting, PVC resin, various auxiliary materials need to be added to improve their performance and processing characteristics.

These auxiliary materials include:
Stabilizer; lubricant; Fillers; Plasticizers; Impact modifier; Antioxidant; Pigment;

PVC raw material need to add auxiliary materials

The main auxiliary material Caco3 will be add to PVC.

Mixing machine mix all of the auxiliary material with PVC powder.

Using the hot melt plastic recycling machine extrusion the PVC granule

PVC granule

Different colors of PVC pipe fitting material

Step 2: Produce the mold for PVC pipe fitting

The design of PVC pipe joint molds needs to consider the fluidity of materials and the cooling system of the mold. For example, during injection molding, the mold temperature is usually set at 50-70 ℃, while the melting temperature is 185-190 ℃ to ensure that the material can flow uniformly in the mold and form a smooth surface. In addition, complex functions such as rotating core pulling mechanisms may be included in mold design to improve production efficiency and product quality.
PVC pipe joint molds are usually made of specially treated chromium alloy steel, which has good wear resistance and corrosion resistance, and can maintain stability in high temperature and high pressure environments

VC joint mold

The main auxiliary material Caco3 will be add to PVC.

Step 3: PVC fitting injection molding

Injection molding of PVC pipe joints is mainly used to manufacture PVC pipe fittings such as joints, elbows, etc. During the injection molding process, PVC raw materials are first heated and melted and then formed into the desired pipe joint shape through injection molding.
PVC pipe fitting injection molding: The melted PVC material is injected into the mold cavity through injection molding process, and after cooling and solidification, it forms a joint
During the injection molding process, the temperature control and time to avoid the decomposition of PVC and the production of harmful gases. The melting temperature is usually set at 185-190 ℃, the mold temperature is 50-70 ℃, the injection pressure is 70-95 MPa, and the holding pressure is 60 MPa

PVC raw material need to add auxiliary materials

PVC elbow injection molding

PVC H fitting injection molding

PVC T fiiting injection molding

Haichen PVC machine

Step 4: Robot fetch and cutting sprue

In the production of PVC pipe joints, robotic arms can be used for various tasks such as extracting inserts, embedding inserts, removing finished products, and separating sprue.
The automation of these operations makes the entire production process more efficient and stable, reducing errors and fatigue problems caused by human operation.
In addition, the application of robotic arms can ensure the installation accuracy and sealing of joints, thereby improving the quality and reliability of products.

Robot separate the PVC fitting and sprue

PVC jiont fetched by robot

Step 5: Packing PVC joints automatically

Automatic counting and inspection system: Some automatic packaging machines are equipped with automatic counting and inspection systems to ensure that each bundle contains the correct number of pipes, thereby improving accuracy and eliminating the need for manual counting.
Automatic bagging and sealing: The fully automatic PVC pipe packing machine can directly bagging and packaging before leaving the factory, saving previous manual processes such as counting, bundling, bagging, and sealing, greatly improving production efficiency.

PVC fitting packing machine

PVC fitting packing machine

Type of Pipe fittings / PVC jionts

Water Supply Pipe Fitting

PVC pipe joints include direct joints, three-way joints, four-way joints, elbows, flange joints, clamp joints, etc. These joints are suitable for PVC pipes and have good chemical stability and corrosion resistance

Electrical Pipe Fitting

It used to connect PVC conduit, mainly used for buried wires in walls or other pipeline systems. This type of joint can help wires or pipes pass smoothly through walls or other structures, and ensure the sealing and stability of the connection.

Drainage Pipe Fitting

Common methods for connecting PVC drainage pipes include using sealing gaskets, bonding, and flange connections.PVC pipe coupling, for water drainage. There are many PVC pipe sizes, so the PVC pipe fitting.

PPR/PE Pipe Fitting

PPR and PE pipes are two commonly used water supply pipeline materials, which have significant differences in structure and performance. Has high plasticity and heat resistance, commonly used in water supply pipelines in home decoration projects.

Generally, PVC pipe fittings name have a lot. Also because PVC pipe sizes is different,so the PVC fitting also with many size.We divide PVC joints into five categories:

1. Water supply pipe fitting; 2. Drainage pipe fitting; 3. Electrical pipe fitting;4. PPR pipe fitting;5. PE pipe fitting;

PVC pipe fitting material

There are two forms of PVC (polyvinyl chloride): rigid polyvinyl chloride and flexible polyvinyl chloride. Sometimes we also name it “soft PVC” and “hard PVC”.What’s the difference between a flexible and rigid PVC?

1. The content of plasticizers different
Flexible PVC with added plasticizers is relatively softer and has the characteristic of being “rubber”. For example: garden hoses, medical blood bags.
However, rigid PVC compounds hardly add plasticizers, which maintains the hardness of PVC.
2. Different physical properties
Hard PVC compounds are usually denser and harder, making them sturdy and durable; Flexible PVC compounds are flexible, making their applications more diverse.
Advantages and disadvantages: Hard PVC may be stronger and more durable, while flexible PVC can be made into materials that are resistant to chemical and liquid damage.
3. Different uses
Rigid PVC is more suitable for external protective purposes, such as wall cladding, eaves, and drainage pipes. Flexible compounds can provide different applications, such as being used as materials for manufacturing medical blood bags, rubber boots, and even summer beverage coasters.

Candy Box-Toy Train Making Process

Case: Candy box – plastic toy train injection molding

plastic train toy manufacturer machine will be a little bigger to 280 ton toy injection making machine.

The toy train for packing the children candy, so the material also need PP.

PVC pipe fitting material

PPR pipe fitting material

PPR pipe fitting material

PE pipe fitting material

4 steps for PVC pipe fitting injection molding production

Step 1: Material charging

PVC raw materials enter the heating unit of the machine through the hopper: screw and barrel. In the middle of the barrel is a rotating screw. The rotation of the screw will push the material forward. And the screw moves backwards while rotating. The screw gradually rotates backwards to push the PVC material forward. During the process of advancement, PVC particles are melted and finally pushed into the front end of the material barrel.

Step 2: Injection

Once the front end of the material barrel is filled with enough PVC raw material, the screw stops pre molding and is pushed forward by the hydraulic cylinder at the back to quickly squeeze the melted raw material at the front end, forcing the melted PVC to enter the mold through the nozzle, gate, and runner. The screw must be pushed with sufficient pressure to allow the melt to enter the mold from the nozzle. The raw materials must be filled with sufficient pressure to fill every gap in the mold.

Step 3: Pressure hold

This pressure can be maintained to ensure shape retention during PVC cooling.

Step 4： Cooling

Cooling is achieved by passing the cooling fluid through the channels around the mold. This can be water or other coolant. Once cooled, the product will spray out. Duirng cooling, the machine will use the cooling time to charge the material, so that we can shoter the cycle time.

Step 5: Demold & ejection

The mold opens and the core puller begins to work. Because PVC pipe joint molds often have multiple sets of core pulling. Therefore, demolding takes time.

PVC pipe fitting injection molding- case show

PVC pipe fitting making process

PVC joints, classified by structure:

Direct connector: used to directly connect pipes and maintain the original direction when walking.PVC pipe coupling production.
Elbow joint: used to change the direction of pipelines, generally including 90 ° elbows, etc. plumbing pipe types injection molding machine.
Tee connector: used to connect three pipes and can achieve branching or convergence of pipes.
Union joint: used to connect the end of the pipeline to prevent water leakage.

Case: Elbow join

Case:Pipe fitting show

Case: Tee connector

Haichen machine user of pvc pipe fitting

Coupler pipe fitting

2 cavities coupler PVC pipe fitting injection molding.PVC pipe coupling injection molding process.

Elbow 90 mold

2 cavities 90 Elbow PVC pipe fitting, production. Plastic water pipe fittings have lots pvc pipe sizes.

90 elbow mold

two cavities 90elbow PVC pipe fitting, fetched out by robot from injection molding machine

Elbow 4 cav. mold

4 cavities PVC pipe fitting loading on the injection molding machine.

H pipe fitting mold

1 cavity H pipe fitting on the injection molding machine.

45 elbow mold

45 elbow mold load on the injection molding machine.

Reducing Tee mold

Reducing tee PVC pipe fitting, with 3 side slider control by core puller.

Elbow 12 cav. mold

PVC pipe fitting molding with 12 cavities. Plumbing pipe types,made by injection molding machine.

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Why choose Haichen plastic bucket injection molding machine?

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Choose Haichen as your injection molding machine Manufacturer for disposable cutlery. With years of experience and a commitment to quality, we have helped countless factories succeed through efficient and effective production.

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Excellent screw with good plasticizing and mixing properties. Professional design, good wear resistance and fast plasticizing speed. Suit for toy material like ABS PP…

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The new generation computer control system touch screen responds faster, is more convenient, and has high scalability, ensuring that the machine operates more stably and with higher precision.

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The template feet are enlarged and the large-area contact ensures smooth operation.

Advanced injection system

Perfect injection speed, faster response and low friction during injection, ensuring energy saving. Linear guide features.

Haichne has 20 years of experience!

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The machine control is easy with 21 different languages on the control screen.

Haichen is a manufacturer of injection molding machines. We supply the PET machines from 160 ton to 560 ton. The clamping force is from 3300KN to 30000KN.

Haichen PVC pipe fitting injection molding machine for export

90 ton machine loading

Haichen’s 90-ton injection molding machine was loaded and exported to Moscow.

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HCK110 ton injection molding machine export Haichen 160’s toy manufacturing machines are shipped to South America.

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120 tons of complete machine shipped
HCK200toy making machine is loaded and exported.

120 Ton molding machine

120 tons injection mold clamping device
The clamping device of the 120-ton machine is loaded for the Eastern European market.

HCK 160 Machine Loading

K series 160 ton injection molding machine to Moskow.

Haichen Machine Oversea

Haichen HCK160 injection molding machine with molds.

220 tons plastic toy making machine

220 tons plastic toy making machine loading. K series 220-ton injection molding machine is shipped to Thailand.

HCK230 ton machine export

HCK230 ton machine export Haichen HCK160 injection molding machine with plastic teapot mold.

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Some factories produce PET botlle that choose Haichen injection molding machines.

“We switched to Haichen’s injection molding machines, and the results have been remarkable. Our production has never been this efficient. Thanks to Haichen, we’re setting new quality standards in our industry.”

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“Haichen’s commitment to precision is exceptional. Their machines have elevated our manufacturing process, and we couldn’t be happier. Quality, reliability, and support – they excel in every aspect.”

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“Innovation is at the core of Haichen’s DNA. Their state-of-the-art technology has given us a competitive edge. Their team’s expertise is second to none, and it shows in the performance of their injection molding machines.”

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