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Changshu smoothly to squeeze SuChang talk about extrusion die extrusion type and the advantages and disadvantages of squeeze tube
by：CSSSLD
2021-01-23
Extruder head made up of alloy steel inner sleeve and carbon steel jacket, inside the nose is equipped with plastic injection mould.
Is the role of head rotation movement of the plastic melt into a parallel straight line, import the die set is steady, and give necessary to plastic molding pressure.
Plastic plasticizing compaction in the barrel, is approved by the flow of porous filter plate along a certain head neck into the head forming die, die core die set appropriate coordination, the formation of cross section and decreases the annular space, make the plastic melt around the conductor to form a continuous solid tubular cladding layer.
In order to ensure the nose in plastic flow is reasonable, eliminate accumulated plastic corner, placed tend to have a split sleeve, to eliminate the plastics extrusion pressure fluctuations, also has a set of equalizing ring.
The nose is also equipped with mold correction and adjustment device, easy adjustment and correction of mold core and mold set of concentricity.
In the cable industry production, the plastic extruder use extrusion mould (
Including mold core and mold set)
Below each have advantages, changshu of crowded SuChang talk smoothly under the extrusion die extrusion type and the advantages and disadvantages of squeeze tube!
one, extrusion type ( Also known as the pressure type) Die
1, the technical parameters of extrusion type:
A, model within A point: length less than 3 mm or no length
B, outside the ordinary models: common corridor outside the mould, and grow up to 3 mm.
C, the secondary compression mold: mold gallery outside grew up to 5 mm as the second pressure section, the first pressure section of conical part
D, extrusion die debugging: internal and external mold mouth distance 10 & ndash; — 30mm.
2, advantages and disadvantages of
the mold core is not easy to adjust, and easy to wear, especially when the wire core and the core is bent, easy to cause serious plastic layer partial core; Product quality to the mold dependence is bigger, extruded high to mold fitting accuracy requirement, and extrusion line core bending performance is bad. In addition, due to the extrusion mold in the extrusion die of the larger reaction, extrusion production was packed tubular much lower. Extrusion mold, therefore, are only for small section line core or request to pack tightly, special round appearance, uniform wire core, and extrusion of plastic tensile than outsiders. Currently the vast majority of wire and cable insulation extrusion mold production, but there are some wire insulation production was crowded tube type and half crowded tube mould, extrusion type of another disadvantage is that eccentric adjustment difficulties, insulating layer thickness is not easy to control.
2, squeeze tube ( Also known as the bushing) Die
this form of mould is only used for cable sheath.
1, compared with extrusion type has the following advantages:
( 1) And extrusion speed. Squeeze tube mould make full use of the characteristics of the plastic body of korah, the quantity of glue by mold core and mold set between the ring to determine the sectional area and it is far greater than the rubber thickness of the coating on the wire core, so the linear velocity according to the different of plastic draw ratio and improved.
（ 2) , cable production, simple operation, eccentric adjustment easy, eccentric unlikely to occur. The radial thickness uniformity is only determined by the die set of the concentricity of, not because of the core of any form of curved eccentric and make the cladding layer.
（ 3) And the clearance between the conductor and mold core inner hole is bigger, reduce wear and tear, improve the service life of the mold core.
（ 4) , easy mold fitting. Because the mold core in the clearance between the wire diameter and hole range is larger, the generality in the mold core increase. The same set of mold, can adjust the draw ratio method, using different wire diameter, extrusion plastic layer of different thickness of coating layer.
（ 5) , plastic after strench & other; Orientation & throughout; And, consequently, increase the mechanical strength of plastic, the crystalline polymers ( Polyethylene) Extrusion is especially meaningful, which can effectively improve the strength of the wire drawing direction.
（ 6) , sheath thickness is easy to control. By adjusting the speed of traction to adjust the draw ratio, thus change and control the thickness of sheath.
2, squeeze tube type faults:
( 1) Poor, the density of plastic layer. Because the mold core and the Angle between the die set is small, plastic by compaction (when it is squeezed again Tight) Force is small. In order to overcome this defect, can increase the draw ratio in extrusion, make the molecular order and achieve the goal of improve the plastic layer is closely.
（ 2) , the combination of plastic and wire core tightness is poorer, this is the insulation extrusion of squeeze tube type cannot be used widely for main reasons. General can improve by extraction extrusion plastic and wire core close degree, of course, improve the draw ratio is also useful.
（ 3) , appearance quality than extrusion type roundness, cabling, around the bag, weaving and other core of nonuniformity in exposed sheath surface appearance.
one, extrusion type ( Also known as the pressure type) Die
1, the technical parameters of extrusion type:
A, model within A point: length less than 3 mm or no length
B, outside the ordinary models: common corridor outside the mould, and grow up to 3 mm.
C, the secondary compression mold: mold gallery outside grew up to 5 mm as the second pressure section, the first pressure section of conical part
D, extrusion die debugging: internal and external mold mouth distance 10 & ndash; — 30mm.
2, advantages and disadvantages of
the mold core is not easy to adjust, and easy to wear, especially when the wire core and the core is bent, easy to cause serious plastic layer partial core; Product quality to the mold dependence is bigger, extruded high to mold fitting accuracy requirement, and extrusion line core bending performance is bad. In addition, due to the extrusion mold in the extrusion die of the larger reaction, extrusion production was packed tubular much lower. Extrusion mold, therefore, are only for small section line core or request to pack tightly, special round appearance, uniform wire core, and extrusion of plastic tensile than outsiders. Currently the vast majority of wire and cable insulation extrusion mold production, but there are some wire insulation production was crowded tube type and half crowded tube mould, extrusion type of another disadvantage is that eccentric adjustment difficulties, insulating layer thickness is not easy to control.
2, squeeze tube ( Also known as the bushing) Die
this form of mould is only used for cable sheath.
1, compared with extrusion type has the following advantages:
( 1) And extrusion speed. Squeeze tube mould make full use of the characteristics of the plastic body of korah, the quantity of glue by mold core and mold set between the ring to determine the sectional area and it is far greater than the rubber thickness of the coating on the wire core, so the linear velocity according to the different of plastic draw ratio and improved.
（ 2) , cable production, simple operation, eccentric adjustment easy, eccentric unlikely to occur. The radial thickness uniformity is only determined by the die set of the concentricity of, not because of the core of any form of curved eccentric and make the cladding layer.
（ 3) And the clearance between the conductor and mold core inner hole is bigger, reduce wear and tear, improve the service life of the mold core.
（ 4) , easy mold fitting. Because the mold core in the clearance between the wire diameter and hole range is larger, the generality in the mold core increase. The same set of mold, can adjust the draw ratio method, using different wire diameter, extrusion plastic layer of different thickness of coating layer.
（ 5) , plastic after strench & other; Orientation & throughout; And, consequently, increase the mechanical strength of plastic, the crystalline polymers ( Polyethylene) Extrusion is especially meaningful, which can effectively improve the strength of the wire drawing direction.
（ 6) , sheath thickness is easy to control. By adjusting the speed of traction to adjust the draw ratio, thus change and control the thickness of sheath.
2, squeeze tube type faults:
( 1) Poor, the density of plastic layer. Because the mold core and the Angle between the die set is small, plastic by compaction (when it is squeezed again Tight) Force is small. In order to overcome this defect, can increase the draw ratio in extrusion, make the molecular order and achieve the goal of improve the plastic layer is closely.
（ 2) , the combination of plastic and wire core tightness is poorer, this is the insulation extrusion of squeeze tube type cannot be used widely for main reasons. General can improve by extraction extrusion plastic and wire core close degree, of course, improve the draw ratio is also useful.
（ 3) , appearance quality than extrusion type roundness, cabling, around the bag, weaving and other core of nonuniformity in exposed sheath surface appearance.
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