Injection Mould Construction'>

Injection Mould Construction

A molding according to the function of each of its parts can be divided into four sections 1. Introductory part of the plastic nozzle into the cavity cavity 2. penunjuang system (support system) 3. demolding system 4. heat transfer system

Mold Base Standard Part

In the manufacture of injection mold, mold base is an integral part, mold maker can make your own mold base or buy a standard mold base, the system of the mold base can be adjusted with the construction standards required, both for the two plate and three plate, stripper plate ejectors, hot runner and mold base for a screw, when the entire standard mold base is not there to meet the new final step is to make a special mold base.

Injection Mould Classification

classification or types of mold injection very depend on what we need to make the plastic parts, because every parts have specific and unique design. when design molds we must see what the influencing factor like geometry, number of cavities, ejection principle, plastic material and shape of part.

Injection Mold Cooling

This section is the most important part of the overall mold cylcle time, because in one cycle time, the process of heat exchange to spend about 70-80% of the total cycle time, thus setting the optimal heat transfer system will greatly affect the quality and cycle time of a product.

Undercut System : Cam, Angular, Lift Cavity, Loose core

cavity and core, and its derivatives when there are undercut on product, design and construction of a good core cavity and in accordance with the requirement could increase the life of tooling itself, reduce material consumption, reduce dependence on maintenance inserts, and can reduce the cost of making the mold so the mold cost per products also declined.

Showing posts with label molding method. Show all posts
Showing posts with label molding method. Show all posts

Saturday, March 3, 2007

Molding Methode

5:28 PM    4 comments

1. Injection molding
is a manufacturing technique for making parts from thermoplastic material. Molten plastic is injected at high pressure into a mould, Injection mouldings count for a significant proportion of all plastics products from micro parts to large components such as bumpers and wheelie bins. Virtually all sectors of manufacturing use injection moulded parts - the flexibility in size and and shape possible through use of this process have consistently extended the boundaries of design in plastics and enabled significant replacement of traditional materials thanks to light weighting and design freedom, which is the inverse of the product's shape, the product example is interior part of automotive, refrigerator part, printer part and other electronic parts
injection molding basically has two main part core and cavity that build the shape of product, core and cavity mounted in mold base, mold base arranged by plate , basically standard a mold have 10 plate, but a simple mold sometimes have only 6 plates.

2. Extrusion molding
This same with injection process but this like vertical injection with product specially tube shape, this method used for making pipes, pipe of cartridge in printer parts and insulation for electrical cables

3. Calendering
calendering methods use several pair of rolling part, plastic rolls of the material are passed between several pairs of heated rollers, to give a shiny surface. Extruded PVC sheeting is produced in this manner as well other plastics, this method used for making large sheets of plastic

4. Compression molding
compression molding is mostly used to make larger flat or moderately curved parts such as hoods, fenders, scoops, spoilers, lift gates and the like for automotive end-uses mostly used to shape thermosetting plastics

5. Blow moulding
in Extrusion Blow Molding (EBM), plastic is melted and extruded into a hollow tube (a parison). This parison is then captured by closing it into a cooled metal mold. Air is then blown into the parison, inflating it into the shape of the hollow bottle, container or part. After the plastic has cooled sufficiently, the mold is opened and the part is ejected.

Injection blow moulding is used for the Production of hollow objects in large quantities. The main applications are bottles, jars and other containers. The Injection blow moulding process produces bottles of superior visual and dimensional quality compared to extrusion blow moulding
Typical Materials Used for injection blow molding process

Polyethylene Low Density (LDPE, LLDPE), Polypropylene (PP), Polyethylene - Terephthalate (PET), Polyvinyl chloride (PVC), Polyethylene High Density (HDPE)

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