Plastic processing with mould : PROCESS Injection

Injection moulding is the process of plastics processing WITH mould, probably the most common. In itself, however, the word « injection » is very generic:

« Operation which consists of injecting a product into a material, an object. »

« The introduction under pressure of a liquid or gas into the body. »

« Massive injection of capital to bail out an economy, help a company. »

It is used in various application areas (source : Larousse) :
1.  The act of injecting propellants into the combustion chamber of a rocket engine 2.  The act of injecting a spacecraft into orbit.
Wood industry
An operation that consists of impregnating wood, under pressure, with antiseptic products to improve its conservation.
Penetration of a liquid (magma) or plastic (rock) material into an opening in the earth's crust.
Synonymous of injective application.
The introduction, under pressure, of a measured quantity of fuel into the intake air to form a mixture that can burn in the combustion chamber of an engine.
Synonymous of cementing.
The introduction of a fluid into an oil field to achieve better recovery of the hydrocarbons in place.
Public works
Consolidation or sealing of a site or structure by the introduction under pressure of a grout (cement or mortar) capable of setting.

When we talk about injection moulding in the plastics industry, it is POLYMERS that are transformed :

Injection moulding,

« A technique for moulding plastics in which the product is fluidised and then injected into a two-die mould. (Thermoplastics and thermosets are moulded in injection moulding machines of the piston type [the material is fluidised against the walls of a cylinder and pushed into the mould by a piston] or screw type [a helical screw carries the material against a heated wall and advances it towards the nozzle].) » (Source : Larousse)

What are the advantages
of injection?

The injection process requires the design and manufacture of a mould. These two steps add time and cost to developing custom plastic housing. However, the unit cost of manufacture is much lower than the cost of manufacturing in sheet metal or additive printing. As far as finishing is concerned, the various plastic processes are comparable. In terms of shape, injection and additive manufacturing offer more possibilities.

When to switch from « plastic sheet metal work » to « injection » ?

Plastic sheet metal is the most suitable and economical technology for small and medium-sized series. Our small and medium series technologies are effective from a few dozen to several thousand parts; the tipping point with injection moulding depends on the type of product, and the expectation of stability without modification.

If this point is reached, and it becomes more advantageous to change technology, we will offer you the transfer to the most suitable technology of the moment (probably injection), via our department: « LTP-Multitechnology ».

If your box meets a market of large series of several hundreds of thousands of pieces, our subcontracting department “LTP-Multitechnology” will propose you the transfer in the most adapted technology of the moment.

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