The History of Pastic Injection Moulding

In 1868, Hyatt developed and improved a plastic material and makes it in the shape of an article.  Then in 1872, he and his brother Isaiah registered the first patent plunger-type injection molding machine. Basically it is running like a giant hypodermic needle. This huge needles inject plastic into the mold through a heated cylindrical.

In the 1940s, during the Second World War, ​ huge demand of cheap mass-produced for the product made it popular.

In 1946 American inventor James Watson Hendry build the first injection molding machine, which makes the injection more precisely controlling the speed and quality of an article. In 1951 the United States developed the first screw injection machine.

In the 1970s, Hendry then developed the first gas-assisted plastic injection moulding process and allows the production of complex, hollow products, of rapid cooling. This greatly increases the flexibility and strength of the design and the end parts manufactured while reducing production time, cost, weight and waste.

A Famous China Plastic Box Molding Company -Eiffel

Do you looking for plastic box molds?

If so, I would introduce you a plastic box molding company who has been in the industry for over 2 decades – Taizhou Eiffel Mould Plastic Co., Ltd

Founded in 1992, Eiffel has cultivated a production team of comprehensive technology and rich experience. Eiffel now is proudly to be a Famous China Mould Manufacturer. Eiffel works on various kinds of plastic box molds, such as crate mould, pallet mould, beer and bottle box mould, storage box mould, folding box mould and so on.

Welcome to visit our website for more information: www.bigmould.com

Email: info@bigmould.com

plastic box mould
plastic box mould

How to do Plastic Injection Mould in the Factory?

The mould tool is the key component in the plastic injection moulding

  1. It provides a passageway for molten plastic to travel from the injection cylinder (barrel) to the mould cavity.
  2. It allows the air which would be trapped inside when the mould closes to escape.  If the air could not escape (be vented) then the moulded component would contain voids (air bubbles) and have a poor surface finish.
  3. It cools the moulding until it sets.  The temperature of the mould is controlled because it is important that the moulding cools at the correct rate to avoid distortion and stress.  In most systems water circulates through channels drilled through the mould similar to a car engine cooling system.
  4. By means of ejectors the finished moulding is pushed from the mould.

 

THE PLASTIC MOULD TOOL

 mould

  1. Guide Pins – fixed to one half of the mould and align the two halves by entering the holes in the other half.
  2. Runner – passageways in the mould connecting the cavities to the sprue bush.
  3. Gate – Frequently the runner narrows as it enters the mould cavity.  This is called a gate and produces a weak point enabling the moulding to be easily broken or cut from the runner.
  4. Sprue Bush – Tapered hole in the centre of the mould into which the molten plastic is first injected.
  5. Locating Ring – Positions the mould on the fixed platen so that the injection nozzle lines up with the sprue bush.
  6. Mould Cavity – The space in the mould shaped to produce the finished component(s).
  7. Ejector Pins – These pins push the moulding and sprue/runner out of the mould.
  8. The Shot – Total amount of plastic injected into mould.
  9. Sprue – Material which sets in the sprue bush.

What is the Process of Plastic Injection Moulding?

The plastic injection moulding process produces large numbers of parts of high quality with great accuracy, very quickly.

Plastic material in the form of granules is melted until soft enough to be injected under pressure to fill a mould.  The result is that the shape is exactly copied.  Once the plastic moulding has cooled sufficiently to harden the mould opens releasing the part.  The whole injection moulding process then repeats.

 

 

04

Close Mould

CLAMPING – the moving and fixed platens of the injection moulding machine (see next section) holds the mould tool together under pressure.

                        01

Inject Molten Plastic

INJECTION the molten plastic that has been melted from pellet form in the barrel of the moulding machine (see next section) is injected under pressure into the mould.

 

02

Hold Mould Closed

DWELLING after the molten plastic has been injected into the mould pressure is applied to ensure all cavities are filled.

COOLING the plastic parts are then allowed to solidify in the mould.

                                      03

 

Open Mould and Eject Part

OPENING the moving platen moves away from the fixed platen (see next section) separating the mould tool.

EJECTION – rods, a plate or air blast then aids ejection of the completed plastic moulding from the injection mould tool.

The length of time from closing the mould to ejecting the finished plastic moulding is the cycle.

Huangyan Mold History

Mould as the mother of industrial sector, for pillar industries of the national economy like machinery, electronics, automotive, petrochemical and construction played a role as benefit amplifier and a measurement of a country’s manufacturing sector.

Huangyan mold industry sprout in the 1950s. By the end of 2009, there are more than 2,000 mold manufacturing enterprises, including plants, of which more than 500 professional mold enterprises, and over 90 are sizeable. In 2009 in the whole Huangyan region, the output value exceeded ten billion, and mold has become a local pillar industry, at the same time Huangyan mold industry is the country’s most concentrated area.

After years of development, the mold industry cluster effect significantly, forming complete mold manufacturing industry circles. Huangyan Mold has gone from hand-molding to the modern CNC mold production process, and has become a world-renowned mold production base.

At the situation of the Huangyan mold industry come to the birth of public network service platform: imould.com, who as the platform carrier, from the beginning to serve the construction of the main corporate network Huangyan Mould camp, develop into all mold-related enterprises online marketplace for online transactions.

imould.com takes information technology services as the means to establish an efficient manufacturing market online, and become a sustainable, customer satisfaction mold industry public service platform.

plastic pipe fitting catalogue made in Jingzheng Mould Co.,Ltd

Welcome to our factory! We will try our best to support you.

Followings is our factory mould catalogue,hope reference for you:

CPVC feedwater pipe fitting mould 

 UPVC drainage pipe fitting mould 

UPVC electrical pipe fitting mould 

PVC pressure pipe fitting mould 

PVC /PPslience drainage pipe fitting mould 

PVC/PP collapsible pipe fitting mould 

PVC /PPR Valve moulds 

PPR hot and cold water pipe fitting mould 

PP Sanitary pipe fitting mould 

PE feedwater pipe fitting mould 

 PE electrofushion pipe fitting mould 

  PE congrated pipe fitting mould 

 PPH/ABS/PB /PSU/PPSU pipe fitting mould 

What items are you interesting in? Any question please do not hestitate to contact with me.  Looking forward your email.(contact with me: plastic@jingzhengmould.com)