Extrusion blow molding
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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.
EBM processes
may be either continuous (constant extrusion of the parison) or intermittent. Types of EBM equipment may be categorized as follows:
1. Continuous Extrusion Equipment
Rotary wheel blow molding systems
Shuttle machinery
2. Intermittent Extrusion Machinery
Reciprocating screw machinery
Accumulator head machinery
Examples of parts made by the EBM process include dairy containers, shampoo bottles, and hollow industrial parts such as drums.
Basic polymers, such as PP, HDPE, PVC and PET are increasingly being co-extruded with high barrier resins, such as EVOH or Nylon, to provide permeation resistance to water, oxygen, CO2 or other substances. In dairy applications, it is possible to extrude a black light-blocking layer in the center layer of containers, with opaque white resin used in the inner and outer layers.
Compared to injection molding, blow molding is a low pressure process, with typical blow air pressures of 25 to 150 psi. This low pressure process allows the production of economical low-force clamping stations, while parts can still be produced with surface finishes ranging from high gloss to textured. The resulting low stresses in the molded parts also help make the containers resistant to strain and environmental stress cracking.
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Accumulator Head Machinery
is used for the extrusion blow molding of large industrial hollow parts. Examples of parts produced on this machinery include drums, trash cans, automotive panels, playground equipment, and large containers, such as Jerry Cans, for liquid storage. Most parts produced on accumulator head machinery are single layer; however, specialized machinery is capable of producing parts with up to seven unique layers of plastic - these machines are used primarily to manufacture automotive gasoline tanks with barrier layers.
Detailed introduction
&#;> Introducing advanced technology from Germany, Italy, japan etc.Involving advanced design and production of super large-scale blow-molding machine and engineering management capability. Holding over 40 items Patent Technologies.
> Special design can be made to order to for visistipe(VS) or two colors(TC) or two layers(TL) bottles.
DHD-5L Blow Molding Machine General Introduction
1. DHD-5L blow molding machine is a double station machine, and suitable for producing high quality container with medium output with from one to six fold die head, for use in the packaging of petroleum, cosmetics, chemicals, pharmaceuticals, food, toys and auto-parts.
2. The clamping system is a high-precision single-station linear guide, extrusion system using a hard gear reducer and inverter imported from Japan.
3. The die head system adopts central-incoming extrusion die made of special steel, imported hydraulic valve and seal parts with proportional control valve.
4. The control system consists of PLC and Human-machine interface imported from Japan, an automatic temperature control module and imported electrical part.
DHD-5L Blow Molding Machine Basic Components
1. Die: Vertical first-in first-out structure
2. Extruder unit: Imported automatic temperature control module, with the screw driven by converter electrical machine and hard gear surface reducer to achieve infinite speed variation.
3. Clamping unit: Hydraulic fixed bi-directional clamping system with good stability.
4. Hydraulic system: Imported hydraulic unit and proportional control.
5. Electrical system: Siemens PLC, world brand, electrical components
DHD-5L Blow Molding Machine Advantages
1. Machine platen can be moved down & up.
2. Machine platen has been strengthened.
3. All tubes and lines are located in good order.
4. Mold-moving stand is in box shape. It can make movement more stable and avoid distortion.
5. Tie bars are strengthened to make movement more stable
6. Mold-closing and mold-moving cylinder has been equipped with joint bearing. It can help protect mold-closing and mold-moving cylinder.
7. New blow construction. It can blow vertically and even blow from certain angle.
8. Blow construction has connected to exhausting air pipe. It can make product cool down more quickly.
9. Machine is with auto deflashing.
10. Machine can be connected to conveyor to carry the slitter edge to crusher to be reused.
11. Machine can be connected to conveyor to carry out bottle and connects the filling machine directly.
12. Machine can be equipped with robot arm to take out the bottle.
13. Machine can be equipped with circle-type cutter to trimmer the bottle with foil-sealing type.
14. Mold platen has been professionally designed in construction and shape to keep stable.
15. New and safe machine door.
16. Machine is equipped with reduction valve in the mold-moving parts. It can make mold move more quickly and more stably.
17. Machine is equipped with manual adjuster to adjust the position of mold and blow pin. It makes the adjustment more conveniently.
18. Screw stand is of high rigidity.
19. Screw can be adjusted forward and backward, leftward and rightward.
Advanced processing equipment:
1. Introducing advanced technology from Germany, Italy, Japan etc.
2. Involving advanced design and production of super large-scale blow-molding machine and engineering management capability.
3. Holding over 40 items Patent Technologies.
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