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Dakumar Machinery Co.,Ltd
Add : 156# Ai Bin Rd, Xinqian Street, Huangyan Taizhou, Zhejiang, China
P.C. 318020

Tel : 86-576-84023777
Fax : 86-576-84018996

Web :
E-mail :
Plastic Injection Molding Machine
Striving for excellence
providing complete injection molding strategy to meet customers' requirements

Offering a complere configuration system,users can choose a suitable plastic injection molding machine in terms of different requirements

Plastic Injection Molding Machine - Blog


injection machine designer

Dakumar Machinery Co., Ltd, the famous brand injection molding machine manufacturer in China, now we have an very urgent recruitment for large injection machine designer, if you are interested or you know some professional designer, please feel free to contact us, we will offer high income for the designers:

Professional designer which worked in Europe famous injection molding machine company, at least 10 years work experience for large injection molding machine and worked for two plate molding design and research, others requirements as below:

  1. Company: Dakumar Machinery Co., Ltd
  2. Position: Design and development engineer
  3. Address: Huanyyan area of Taizhou city, Zhejiang province, China.
  4. Responsibility:

A.      Lead project team responsible for design and development of junior hydraulic injection molding and assembly work, and responsible for the whole machine performance, cost and quality control.

B.      Mainly responsible for junior hydraulic injection molding machine mechanical part design, mainly including clamping and injection parts, rack and sheet metal parts.

C.      Coordinate with hydraulic engineers, electrical engineers to complete the injection molding machine.

D.      Coordinate with purchasing department, to control the cost of machine.

E.       Coordinate with sales department, to offer the technical supports.

F.       Coordinate with production department, assembly and debugging of the whole machine on-site guidance and support, responsible for preparation of assembling process documents.

G.      Coordinate with related departments, is responsible for sales, procurement, assembly and so on.

If you have recommendation engineers, please feel free to contact us, we are waiting for your joining. 


Your sincerely,

Post by Ms. Rachel

Skype: sino-mould01

Dakumar machine can reach very high speed injection due to its high speed response,
Compare to traditional injection molding machine, using 5H molding machine, the cycle time can be 30%-50% short, it is especially suitable for thin wall products molding. For 4 cavity ice cream container mould, the cycle time, we can reach 4.5s.

Dakumar machines is a kind of high safety machine, machine designed with the concept of people oriented. Machine with trial protection to make sure no accident will hurt workers.
High speed
Machine adopts high precision single cylinder injection system, especially suitable for high speed injection, with low-inertia and high response speed.
Machine adopts accumulator to realize high speed injection, the max injection speed can reach 300-450mm/sec( according to different machine mode).
High stability circulation ability
Machine adopt fully closed loop injection system with precision Moog servo valve, make sure injection is precise and stable.
Double hydro-cylinder for injection makes sure the machine injection unit under balance force, it avoids leakage during high pressure injection, and injection is more stable.
High safety
Machine with mechanical, hydraulic, electrical triple protection.
High injection precision
Machine adopt European advanced controller 1000/2000, to control the temperature and precision.
High energy saving
Machine with high response servo system, machine output according to actual need, no overflow no waste; it can save powder around 30-70%.

So, Dakumar is the professional high speed injection molding machine maker in china, it is the famous high speed injection molding machine supplier. We have rich experience about plastic high speed injection molding machine making. You can believe us. If you have interest about that, please feel free to contact me.

Contact: Miss Natasha
Skype: sinomould-01

High speed injection machine


   Injection molding processing steps

After we have processing injection molds and injection molding machines now we will talk about products that have injected So, if you look closely you will see circular ejector pin “witness” marks on molded products. For example chair, on it is bottom, has an array of witness marks. When the part drops from the mold, an operator has to remove the sprue -that section of plastic that connected the injection unit to the mold, sprues are manually twisted or cut off the part. Sprues are attached to objects only in molds that make single items at a time-like a chair. Smaller objects are made in multiples in a single mold. In these the sprue connects not to the part itself, bit to a network of the distribution tunnels called “runners”, the runners fan out from the sprue and connect to each cavity in the mold via a small-typically  rectangular- entrance called the gate. You can see the gate on plastic cutlery. The parts for model planes typically come still attached to their runners. Molds always have at least two parts. And where the parts of the mold meet is called the parting line. Here on this piece of cutlery you see the parting line along the side of the fork,. when mold are never perfectly aligned nor do they have sharp corners-this creates a noticeable parting line on the molded object

Posted by Dina


injection molding processing steps



Sino Holdings Group is the professional PET perform mould and machines manufacturer in China, with our rich experience, we summary some technical points as below:


1.       Why Pet preform have bubble and how to solve it?

PET material didn’t adequately dried.

A.      Enhance the dry of the PET material.

B.      Increase the PET material temp.

C.      Reduce the screw speed.


2.       Why PET preform injection is not transparent and how to solve it ?

A.      PET material didn’t adequately dried, the PET material must be dried more than 4 hours.

B.      PET material is not good and the plasticizing is insufficiently, change the new and better PET material, speed up the screw speed.

C.      The PET prefrom mould cooling system is insufficiently, enhance the cooling water.

D.      Others material have mixed to the PET material.

E.       PET material temperature is too low, increase the PET material’s temperature.

F.       PET preform thickness is too thick, reduce the wall thickness.


3.       The bottom of PET preform became white solutions:

A.      Increase the nozzle temperature.



B.      Strengthen heat insulation.

C.      Increase the material temperature appropriately.

D.      Speed up the injection speed.

E.       Reduce the speed of the cooling water.

F.       Reduce pressure maintaining.

Welcome to contact us, we are sure to offer you the fine solution…


Posted by Ms. Rachel

Skype: sino-mould01


 Injection molding processing

  Sino holdings group always make sure to give customers teh infor about injection molds, We had shown before some steps of injection molding processing, and how the injection molding machines work and how it becomes injected after all now we will show the processing in injection plastic molds and what kind of complicated processing happens from injection molding machines to injection plastic molds

As the mold open the volume increase without introducing air, which creates tremendous suction that holds the mold together. So at the first mold slowly opens several millimeters to allow air to rush in and break the vacuum, and then the mold quickly opens the rest of the way so the part can be removed.

   The slow step is needed to prevent damage to the mold-these precision machines steel mold can cost hundreds of thousands dollars. Removing the part from the mold can be difficult. When the plastic cools, it shrinks and so become stuck tightly on the core half of the mold. Molds have built –in ejectors pins that push the part off the mold, the ends of the pins sit flush with the core half of the mold, but are not perfectly aligned-sometimes they protrude or are indented slightly

Posted by Dina


The continue of injection molding processing

  Injection molding processing is so complicated we had displayed before three steps for the injection molding, we will keep going on explaining this complicated procedure from where we stopped last time

After the screw action itself heats the  plastic throughout, the shaft’s diameter increase along the screw so that distance between the wall and the shaft decreases the flights ,then, squeeze out air as they move the plastic  forward and they shear the pellets and press them against the barrel’s wall. This shearing creates friction and so heats the plastic throughout. This screw induced shear supplies a majority of the heat needed to melt the plastic-between 60 and 90 percent* with the rest from the heater bands. The molten plastic flows past the front of the screw through indentations or “flutes” when there is enough plastic to fill the mold at the front of the screw, it rams forward like a plunger injecting the plastic into the mold. The plastic cannot flow backwards because when the screw pushes forward, a “check rings” is shoved against a “thrust ring” o block that backwards movement of the molten plastic. This forces the plastic into the mold. Initially the cavity image is filled with air. As the molten plastic is injected it forces air out if the mold, which escapes through vents. These vents are channels ground into the landing surface of the mold. They are very shallow-between five and forty microns deep.

Posted by Dina



injection molding processing

 Firstly ,let us celebrate Dakumar honored to be ranked the 2nd place ,among the top 10 brand injection molding machine on Dec 28th . Dakumar ,a standout develop and research injection molding machine which is getting more and more famous in recent year.


Dakumar machinery are specialized in offering customer different seriers of injection molding machine . from small to high tonnage injection molding machine .now our injection plant have developed from 50Ton injection molding machine to 4000Ton high tonnage injection molding machine . Dakumar is the professional injection molding machine manufacturer in China, it is the famous injection molding machine supplier. We have rich experience about injection molding machine making. Satandard injection molding machine ,injection molding machine with servo motor ,what is more , we are also specilized in making PVC injection molding machine and PET injection molding mahine .

Plastic injection molding machine manufacturer China – Dakumar is one of the Chinese leading innovator for plastic injection molding machine researching and developing company , if you have any new project need injection molding machine ,welcome to send your enquiry to my mailbox .  

Posted by Selinda

E-mail :

Skype: sinogroupe-selinda 

We are IML turnkey production line supplier a plastic mould and plastic injection machine manufacture. In order to comply with the developing of the society and satisfy the higher and higher requirement from our customer, we find Italy’s robot company as our cooperator. In this way, we can supply our customer one line system for IML.

Plastic Mould:

The mostly IML products we made is thin wall containers. Such as ice cream container, food container, one time using containers. The smallest wall thickness we have done is 0.45mm for the container with 2.25L. We can realize the cycle time to 6s for the container body and 5s for the lids. The IML container mould is different from the normal plastic moulds. The IML moulds should be more precision can the structure should be suitable for the IML. In order to make the mould with high precision, we are using 5Xis CNC tooling machine for the moulds. And after every part of the moulds finished, we will take it to examination department for checking the dimension. If the dimension is not good, we will remake new one part. About IML mould structure, we should consider the center distance between different cavities. As the robot’s claw should be the same dimension as the mould.

Plastic Injection Machine:

We have different series plastic injection machine. Our new machine series is 5H injection machine. It is designed special for thin wall products. This machine have the characteristics of high precision high speed, high energy saving, high efficiency, high stability, high safety.

Please feel free to contact us if you have need IML turnkey production line equipments.
IML turnkey production line
Posted by Julia
 IML container is different from the normal silk printing. It is new technical applied in packaging area. This new technical is invented and first used in European country. We applied it after make the research for IML technical. Chinese IML container molding machine mainly use for PP PE PET material, blowing moulds and injection products. Label will be put into the cavity of the mould before plastic injection. The special material of label will be melted and combined with the plastic product under big pressure and temperature. The pretty plastic product with label is well done at one time.
IML container moldings applications:
1. The packaging bottles for hair care products
2. Medical and health care products containers  
3. Food and drink packaging containers
4. Oil soy vinegar and other condiments containers
The advantage of Chinese IML container molding machineThe product with IML technical is in good appearance. We can make laser aluminizing to make the quality improved more. The label can remain the color and appearance for long time. If we do by traditional label way, we will face the problem of label deformation, label dropping down label broken. The product done by IML will be resistant to compression, water, oil, acid base, cold and hot temperature. The label will be not easy broken down and stain. In this way, the human cost can be saved,. As there is robot system to take the label inside the mould cavity and the product can be finished at one time. The product also can be recycled .
Chinese IML container molding machine

posted by Julia

Plastic injection molding machine manufacturer China – Dakumar is one of the Chinese leading innovator for plastic injection molding machine researching and developing company.

For PVC series:
Based on the design machine for our general products, we developed the PVC injection molding machine that ensures the special requirements of PVC products.
1.Specialized PVC plasticization components, hard chrome plated screw, nozzle(with enlarged nozzle hole), and nozzle flange are adopted to ensure the quality of PVC production and extend the life of the mechanical parts. All the components are highly anticorrosive.
2.Widened safety door design, equipped with double core pulling devices (each one has two inputs and two systems).
3.Barrel: forced cooling by compressed air through air channels in individual zones with independent control, or screw oil cooling connect to oil temperature controller, to avoid thermal degradation of PVC powder in barrel.
4.Enlarged hydraulic motor, to fit the high torque requirement for PVC plasticization.
5.Oil cooling and water cooling system in screw and barrel for large-sized machine.
6.Hardened chromed nozzle, ( large nozzle hole) that ensures product flow and volume.
7.Oversized hydraulic motor matched to meet the large torque requirement needed for plasticizing PVC.

So, Dakumar is the professional PVC injection molding machine manufacturer in China, it is the famous injection molding machine supplier. We have rich experience about injection molding machine making. You can believe us. If you have interest about that, please feel free to contact me.

Contact: Miss Natasha
Skype: sinomould-01

Chinese PVC injection molding machine


All injection molded objects start with plastic pellets, which are few millimeters in diameter. They can be mixed with small amounts of pigment, called “colorant” or with up to 15% recycled material, and then fed into the injection molding machine.
    Before the mold twentieth century injection molding machines used only external heating of the barrel to melt the plastic before a plunger injected the molten material. But because plastic conducts heat poorly, the temperature was uneven in the plunger: either the middle was too cool and not fully melted or the outer regions were too hot and degraded the plastic, the solution was this; the reciprocating screw. 
  often regarded as the “most important contribution that revolutionized the plastics industry in the twentieth century” in the earlier plunger-style machines plastic filled completely the cylindrical barrel, but as I showed you the plastic was not at a uniform temperature, the reciprocating screw overcomes this in three ways:
first, in modern units the plastic fills only the space around the shaft of the screw, this eliminates the cooler center region leaving a thinner, evenly heated layer of plastic.
   Second , the screw has “flights” that wrap around the shaft, as the screw rotates, the flights transport the raw material forward through the barrel. The flights also serve to mix the plastic. The screw action agitates the melting pellets within the flights to create uniform mixture.
 And third the screw action itself heats the  plastic throughout, the shaft’s diameter increase along the screw so that distance between the wall and the shaft decreases the flights ,then, squeeze out air as they move the plastic  forward and they shear the pellets and press them against the barrel’s wall.  
posted by Dina
Skype: sinogroupe-1
injection molding processing

 Nowadays, the Servo injection molding machine is more and more widely used in the world, Dakumar machinery have very rich experience for this kind of machine, and we have sold around 1000 sets for different tonnage of servo motor machines.

DAKUMAR plastic injection molding machine type and model Nr. is big ranges from 50TON to 1600TON.During the past years, DAKUMAR has established service center in Mexico, South Africa, Turkey, Israel, order to make better service, we are negotiating with many oversea professional team to establish more and more service centers and partnership in different countries.

 DKM servo motor machine have the characteristic of :
1-High energy savings

Dakumar servo motor machine can save around 20%~80% energy compare to the other standard injection machine under the same option.

2- Quick response

The response time can reach 0.05sec for the action order

3- Quiet operation

The servo motor machine runs with very low voice. It makes workshop more suitable for workers.

4-Stable for production

Compared with conventional injection molding machines, repeatability is greatly improved due to servo motor closed-loop control.

 Welcome you down visit Dakumar machinery!  looking forward to cooperate with you if you need servo injection molding machine.

plastic injection machine
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