Injection Mould Cooling System

The operating temperature for a particular mould will depend on a number of factors which include the following: type and grade of material to be molded; length of flow within the impression; wall section of the molding; length of the feed system and so on. It is good to use a slightly higher temperature than is required just to fill the impression, as this tends to improve the surface finish of the molding by minimizing weld lines, flow marks and other blemishes.

To maintain the required temperature differential between the mould and plastic material, water is circulated through holes or channels wihthin the mould. These holes or channels are termed flow-ways or water-ways and the complete system of flow ways is termed the circult.

During thr impression filling stage the hottest material will be in the vicinity of the entry point, that is gate, the coolest material will be at the point farthest from the entry. The teperature of the coolant fluid, howerve, increases as it passes through the mould. Therefore, to achieve an even cooling rate over the molding surface, it is necessary to locate the incoming coolant fluid adjacent to hot molding surface and to locate the channels containing heated coolant fluid adjacent to cool molding surface. However, it is not always practicable to adopt the idealized approach and the designer must use a fair amount of common sense when laying out coolant circuits if unnecessarily expensive moulds are to be avoided.

In general, the simplest systems are those in which holes are bored longitudinally through the mould plates. However, this is not necessarily the most efficient method for a particular mould.

When using drillings for the circulation of the coolant, however, these must not be positioned too close to the impression (closer than 16mm) as this is likely to cause a marked temperature variation across the impression, with resultant molding problems.

All in all, waterchannel is very important for a mould, like water for fish. So if you want to learn more about water channel, pls kindly contact me, Ima glad to reply you.

Post by Miss Mandy

Email: auto@sinomould.com

Skype: sino.mould

Whatsapp: +8615757610702

Automotive Bumper Mould

SINO AUTOMOTIVE MOULD CO., LTD, a branch company of SINO HOLDING GROUP, is the leading injection mould manufacture in China, specialized in automotive moulds such as: control panel, shock absorber, fan tray, grills and so on, especially bumper mould.

Below is one of our bumper mould specification；

1. Steel type:  

Cavity - Thyssen Europe DIN1.2738

Core – Thyssen Europe DIN 1.2312

Slides – Thyssen Europe DIN1.2738 + Nitrided

Mould Base – 1.1730 

2. Injection System :

10 tips Synventive Sequence Nozzles

3. Ejection System :

Hydraulic cylinders ( European Vega brand )

4. Surface Finishing:  texture in moldtech

Our automotivebumper mould advantages:

1. mold flow analysis for suitable injection point

2. High speed 5 axis CNC miling machine

3. CMM measuring control cavity dimension

4. Best cooling sysytem for faster cycle working min.50 second

5. Deep hole drilling machine for cooling channel tooling

6. After mould test, QC department will prepare a test sample inspection report, including the condition of mould, product dimensional checking and the improvement solution for the next test.

7. Before shipment, we will run the mould in our factory machine for 2 hours to estimate the mass production, thus to 100% make sure the mould can run in your company without any issue.

If you have any project need automotive mould, please kindly send your requirement, or 2D, 3D design to us, we will quote competitive price for you according to your requirements.

Post by Miss Mandy

Email: auto@sinomould.com

Skype: sino.mould

Whatsapp: +8615757610702

Auto Bumper Mould

Sino has rich experience in supplying and exporting front auto bumper mould and back auto bumper mould to the whole of the world. With the improving of customers’ requirements for quality, precision and surface finish. In 2010 year, Sino invested 3.5 million USD for purchasing new tooling machines to realize improvement of the project high quality and high precision. So until now Sino has been accumulating the experience and importing the advanced technology in automotive moulds.

We pay high attention on five aspects of bumper mould:

1. Steel types:

Cavity-Thyssen KrupDIN1.2738;

Core-Thyssen KrupDIN1.2312;

Slides-Thyssen KrupDIN1.2738+Nitrided

Mould base-1.1730

2. Injection system: we adopt Synventive Sequence Nozzles

3. Injection gate location: The best location of injection gate could reduce the pressure difference of cavity, it will affect the quality of auto bumper.

4. Ejection system: Hydraulic cylinders(European Vega brand)

5. Surface finish: Sino design the departing line on the non exterior surface to be ejected, which will avoid small step on the surface of auto bumper and avoid the issue of cutting flash. In a word, it helps to realize the smooth surface.

Welcome you down to our company, if you are interested in our automotive mould. Please do remember that we can not only offer high quality auto bumper mould for you, but also can offer you the whole bumper production line.

Post by Miss Mandy

Email: auto@sinomould.com   

Skype: sino.mould

Syringe Barrel Mould

Sino mould was founded in year 1999 being located in Huangyan of China. We mainly engage in plastic injection mould making and plastic molding. We have more than 600 employees and 500,000 square meters of factory space. We have advanced machining machines like CNC, EDM machine, wire cutting. We manage OEM business. We are highly experienced in medical moulds, like test tube mould, oxygen mask mould, blood dialysis tube mould, especially in disposable syringe mould.

Below is specification of syringe barrel mould made by Sino Mould

Product Material: PP

Syringe size from: 0.5 to 60 ml

Syringe Barrel Mould Cavities No. from 16 cavities to 128 cavities.

Syringe Barrel Mould cavities and core steel: Stavax S420 made in Sweden Assab Co. Stainless and temper steel

Syringe Barrel Mould Base: P20 Made in America

Slide for cores adopts Luer slip system.

Injection Gate Type: Pin point gate Anole Hot Runner system

Syringe Barrel Mould cavities and cores finishing: mirror polishing finishing

Syringe Barrel Mould Component: inserted into the mould bases, the same parts in the mould are Interchangeable

Syringe Barrel Mould life guarantee: minimum 5 million strokes

Except manufacturing syringe mould, we also can offer the whole production line for customers who want to start syringe project but short of experience. We can offer customer pre-sale service, sale service and after-sale service. What’s more, we will arrange our experienced engineers to go to customers’ factories to help them assemble machine and teach them how to operate and maintain our machines.

Post by Miss Mandy

Email: auto@sinomould.com

Skype: sino.mould

The Advantages of Hot Runner

The runner is a channel machined into the mould plate to connect the sprue with the entrance to the impression. Generally speaking, there are two kinds of runner: one is cold runner, another one is hot runner. But in this text we just talk about the advantages of hot runner.

There are several common types of hot runner, like pin point gate, direct gate, valve gate, special gate, horn gate, timer valve gate and so on. Each of them has its advantages:

1. Pin point gate

1.1 There just has a spot in the plastic parts appearance

1.2 The temperature around gate basin is low

1.3 It suitable for crystalline and amorphous material

2. Direct gate

2.1 Compare with pin point gate, direct gate has a open and direct runner

2.2 Its injection quantity is bigger and injection pressure is smaller

2.3 It is suitable for long flow length and the thicker wall thickness injection parts

3. Valve gate

3.1 Compare with pin point gate and direct gate, the spot in the plastic parts appearance is really small and nice

3.2 Valve gate is automatic opening and closing through valve needle

4. Timer valve gate

4.1 Relative to valve gate, timer valve gate can control the gate inject in turn to keep injection balance.

All in all, hot runner can save material, gate trace is nice, reduce cycle time and improve product quality.

Post by Miss Mandy

Email: auto@sinomould.com

Skype: sino.mould

The Function of Sprue Puller

Sprue puller is very common design in cold runner plastic injection moulds, but different companies have different desing. But there are two basic designs of sprue puller, in one the undercut is produced within the cold slug well region, and is situated below the parting surface. In the other design, the undercut portion of the sprue pulling device is situated above the parting surface. To differentiate between these two basic types, we designate them type A and type B respectivity.

                                                                                

It is very important that sprue is pulled absolutely from the sprue bush when the mould opens. For single-cavity moulds, the sprue feeds directly into the base of the component. The sprue is pulled at the same time as the moulding is pulled from the cavity.

For multi-cavity moulds which using a basic feed system the sprue would probably be left in the sprue bush each time the mould was opened. This would be waste time since it needs worker to remove the unwanted sprue, then continue production. To avoid this disgusting problem and save labor cost, an arrangement for pulling the sprue should always be adopted in the design.

About common sprue pulling methods, it adopts an undercut pin or an undercut recess situated directly opposite the sprue entry. The plastics material which flows into the undercut, upon solidifying, it will provide sufficient adhesion to pull the sprue as the mould is opened. This is the most common design among mould industry.

In a word, in order to help customer save labor cost, material usage and improve the production efficiency, the best sprue design should be as short as possible. What’s more, the bushing should have a smooth, tapered internal finish that has been polished in the direction of the draw in order to ensure clean separation of the sprue and the bushing.

Post by Miss Mandy

Email: auto@sinomould.com

Skype: sino.mould