TMD & TMV Series



2-component machines make parts with two materials (e.g. hard and soft) or two colours, to reduce the labour content 

2-material part, soft arm and hard joint. Assembly is avoided. 

Two-colour part. Spray painting is avoided. 


Parallel barrels 

Tat Ming has developed two compact 2-component machines with parallel barrels, the TMD50-S and TMD110-S. Naturally, they make small parts or parts with few cavities. The barrel separations are 200 mm and 400 mm respectively. 

Moulds for the parallel barrels are low cost as smaller mould bases could be used.  If parts could be laid out to fit 200 mm barrel separation, one mould could be used. If the centre space is wasted for 400 mm barrel separation, find out if two moulds could save some cost. 

TME50-S has 50 tons of clamping force.

TME110-S has 110 tons of clamping force.

TMD50-S has parallel barrels 

The parallel barrels of the TMD110-S. They are 400 mm apart 

2-component moulds 

2-component moulds are designed according to transfer technologies. The technologies are rotary table, robot arm and indexing cores. Transfer technologies are ways to take the parts from the first injection to the other side for the second injection.


Rotary table 

Rotary table is part of a 2-component injection moulding machine using this technology. The core halves of the moulds are mounted on the rotary table, which in turn is mounted on the moveable platen of the injection moulding machine. 

Rotary table with the core half of the right mould mounted 

In the above picture, one of two moulds is mounted on the rotary table.

Rotary table explained 

Refer to the diagram below. In the first shot after starting up the machine, only A is injected by barrel 1. The mould opens, the rotary table turns 180°, then the mould closes for the second injection by barrels 1 and 2. Note that barrel 2 moulds B over A. At the same time, barrel 1 moulds another A. 

When the mould opens again, the 2-component part is ejected from the barrel 2 side. This is repeated in each subsequent mould open. 

Note that the two barrels are at the centre lines of the two moulds.  

Rotary table for parallel barrels 

Robot transfer 

Refer to the diagram below. The transfer of the part from bottom core to top core could be done by a robot arm if the part has no undercut. 5-gallon bottle cap with liner is an example. The robot arm first removes the completed part before transferring the bottom part. 


The process is slower than rotary table due to the additional parts removal and insertion. Especially in multi-cavity moulds, removal and insertion could go wrong, reducing the production rate. 

Robot arm to do the transfer 

3-component parts made by transferring parts from a standard machine to a 2-component machine TMV110-S installed with a rotary table. Two robot arms were used. The staging platform in the middle buffers the parts from one machine to the other. The conveyor takes the completed parts. 

Indexing cores 

Refer to the diagram below. After the top injection, the mould is opened, the cores indexes (advances in the ejection direction), turns 180° and then retracts. When the mould is closed, material from the bottom barrel is injected into the space between the part on the rotated core and the cavity.

The part from the top injection (red) is rotated to the bottom. After the mould closes, the bottom injection (blue) moulds on the first injection. At the same time, the top injection makes another red part. When the mould opens again, the 2-component part at the bottom is ejected. The top injection comes from a vertical barrel.


A mechanism on the 2-component injection moulding machine indexes, rotates and to retracts the cores. It is simpler than the rotary table. 

A mould made using this technology costs more than moulds made for rotary table. 2-component tooth brush handles are an example. When the second injection goes into the cores and the cavities, the mould is better made using this technology.

Vertical barrel 

The TMV series adds a vertical barrel to our TME series to provide the second component. Space saving is its advantage, but a high ceiling is needed.

TMV110-S has vertical secondary barrel on its fixed platen 

90° horizontal barrel 

The secondary barrel could be bigger if placed horizontally at the opposite side of the operator. It is therefore 90° to the primary barrel. We offer secondary barrels from our MA23 and TME50 models. The primary barrel and the clamping unit come from the TME series. 

TME200-183 is TME200 a 90° horizontal secondary injection unit from TME50 added 

In the diagram below, the primary barrel is at the centre of the fixed platen. The secondary barrel can be vertical or 90° horizontal. Note how the melt channels of both moulds turn 90° at least once which is not needed for parallel barrels.

Rotary table for vertical barrel or 90° horizontal barrel. 


The core-back technology is the simplest way to make space for the second component. An application is the soft material on the clips of cloth hangers. Not all 2-component moulds could be made using core-back technology. 

No rotary table nor indexing core mechanism is needed. In the diagram below, the core moves forward before the injection by barrel 2. It moves back before the injection by barrel 1. The core pull mechanism is used to move the core back and forth. Core pull is an option on an injection moulding machine.

Note that the two injections do not happen at the same time. Furthermore, the mould does not open between the two injections.

Core forward to block the material from barrel 2. Core back to allow injecting another material from barrel 1. This diagram is for parallel barrels. 


Piggy-back barrel 


The secondary injection unit rides piggy back on top of the primary barrel. The advantage of this design is the two nozzles could be very close to each other. The nozzle separation is 150 mm in the machine below. 


Like the previous two designs, existing TME models are used to provide the primary barrel and clamping unit. 

TME300 DR has a piggy-back secondary barrel and a rotary table 


Configuration  Floor space  Ceiling height  Customization/ 

Machine cost 

Characteristics 1  Characteristics 2 
Parallel  Medium  Standard  High  Low nozzle separation  Elongated platen with two fixed platen holes 
Vertical  Low  High  Low  Difficult to service  Square platen 
90° horizontal  High  Standard  Low  Takes up much space  Square platen 
Piggy-back  Low  Medium  Medium  Very low nozzle separation  Square platen with elongated fixed platen hole or 2 holes 

Configurations of the secondary barrel compared 


Transfer technology  Machine comes with  Machine cost  Mould cost 
Rotary table  Rotary table  High  Medium 
Robot arm  Robot arm  Medium  Medium 
Indexing core  Indexing core mechanism  Medium  High 
Core-back  Core pull mechanism  Low  Low 

Transfer technologies compared 

Marble appearance 

The technology that gives marble appearance on parts have been around for a long timeA standard injection moulding machine with a short screw is used so the material of one colour and master batch of a different colour are not mixed very well. 

Tat Ming has the knowhow. 

Beads with marble appearance 


TMV110-S + robot arm making 2-component drippers,TMV110-S + 机械手生产双色点滴管

TMV110-S + robot arm (2),TMV110-S 与机械人(2)


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