In Extrusion Blow Moulding (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. Continuous and Intermittent are two variations of Extrusion Blow Molding. In Continuous Extrusion Blow Molding the parison is extruded continuously and the individual parts are cut off by a suitable knife. In Intermittent blow molding there are two processes: straight intermittent is similar to injection molding whereby the screw turns, then stops and pushes the melt out. With the accumulator method, an accumulator gathers melted plastic and when the previous mold has cooled and enough plastic has accumulated, a rod pushes the melted plastic and forms the parison. In this case the screw may turn continuously or intermittently. with continuous extrusion the weight of the parison drags the parison and makes calibrating the wall thickness difficult. The accumulator head or reciprocating screw methods use hydraulic systems to push the parison out quickly reducing the effect of the weight and allowing precise control over the wall thickness by adjusting the die gap with a parison programming device.
Right because of EBM’s Process characteristics. some special plastic containers or other hollowed products can only be made on EBM (extrusion blow molding machine). Here list 10 special products, you can only produce it on an extrusion blow molding machine:
1, EXTRA SMALL HOLLOW PLASTIC PARTS
There are many small hollowed plastic products, for example, 1-2mml nail glue bottle, plastic airlock, Squeaker in dog toy, disposable plastic pasteur pipettes, see these on the picture:
as the picture shows, if any plastic bottle like this, or just it is too tiny too small, abosolutely, you can only produce it on an extrusion blow molding machine. injection molding is not available for it.
2, EXTRA LARGE HOLLOW PLASTIC PARTS
There are so many large plastic container, for example, unral barrel, water story tank, solar water floats, station seat, these is made by extrusion blow molding machine 100 percent.
3, DOUBLE-LAYER OR MULTI-LAYER HOLLOW PLASTIC PARTS
Mulit layer or double layer plastic container now becomes big. Customer needs. it is Commonly found in food storage plastic container and other shelf-stable items, multi-layer plastic container is used to keep it’s contented products fresh. It’s made from several different types of plastic layered together to ensure no particles can pass from the environment into the packaged goods. Food flavoring ingredients, pesticides, cosmetics with biological ingredients, these products are in an urgent need for multi-layer plastic containers for packaging.
4, PLASTIC CONTAINERS WITH HANDLES
5, CARTOON WEAPONS
6, TOOL-BOX
7, SIMULATED VEGETABLES AND FRUITS
8, DOUBLE-CHAMBER OR MULTI-CHAMBER CONTAINERS
9, PLASTIC REAL SPOILER
10,OTHER CUSTOMIZED HOLLOW PLASTIC PRODUCTS
