CN1093641A - Plastics granulating method by processes of extruding, quick-cooling and cutting - Google Patents

Abstract

The present invention is relevant for a kind of plastics granulating method by processes of extruding, quick-cooling and cutting, adorn a plastic cement extrusion molding die head at the extruder discharge port end, the end face cutting knife that is pivoted, the corresponding cutting knife of molding die is swept the track plane of cutting and is provided with the moulding hole, the melt plastic cement material of extruding from extruder is strip and extrudes, swept by cutting knife to cut to be graininess, it is characterized in that: spray toward the knife edge front end from cutting knife with cold air, the rotation of mat cutting knife is cooled off cold air rapidly at the plastic strip surface of cutting knife front end, condensed rapidly in its surface, the air cooling of also catching a cold of the blade of cutting knife but keeps low temperature, also to the cut surface cooling, the plastic cement particle surface after the cutting is solidified fully when making the cutting plastic strip.

Description

Plastics granulating method by processes of extruding, quick-cooling and cutting

The present invention is relevant with plastic cement extrusion granulator method, particularly about a kind of cutting of cooling rapidly granulation.

As shown in Figure 1, 2, existing plastic cement extrusion granulator shaped device 10 schematic diagrames.Include: a circular molding die 11, its disc face is provided with most circles and runs through moulding hole 12; All cutting die heads 13, be disc, concentric is hubbed on this molding die 11 central authorities, its health convexes with three projections 14 toward these molding die 11 directions, all fixedly install a cutting knife 15 on each projection 14, this cutting knife die head 13 can be subjected to external force to act on these molding die 11 end faces to turn round, and the track of its cutting comprises all 12 positions, moulding hole.During use, this shaped device 10 is connected on the outlet of extruder end, the plastic rubber material of fusion is strip through the moulding hole 12 of molding die 11, and cut by sweeping of this cutting knife 15 and be graininess and drop.

Aforesaid way is continued to use for a long time, but long-term use experience shows, when the plastic rubber material of fusion is strip and extrudes via moulding hole 12, its temperature is still very high, the plastic cement surface is prepattern still, cutting knife 15 is difficult to cutting, and the particle that cuts out very easily is stained with sticking, therefore prior art is sprayed this molding die 11 end faces with cooling water again, the plastic strip surface of being extruded by moulding hole 12 is cooled off rapidly condense, so that cutting, but if cooling too far, then molding die 11 temperature reduce too much, and plastic rubber material may cause moulding hole 12 blocked at molding die 11 inner cooling and shapings, so all only spray a small amount of cooling water usually, therefore make and extrude the moisture slightly typing in plastic cement surface, the plastic cement particle still might be stained with stickingly mutually after cutting, and now establishes tank with mode reshaping die head 11 belows and accepts the plastic cement particle, the plastic cement particle is cooled off rapidly, but this will make the plastic cement particle moisture, need before using or packing again through the super-dry formality, the real difficult ideal that claims.

The present invention is intended to overcome above-mentioned defective, that is, main purpose of the present invention is to provide a kind of plastics granulating method by processes of extruding, quick-cooling and cutting, need not to use water cooling, so the plastic cement particle of making water content hardly.

Another object of the present invention is to provide a kind of plastics granulating method by processes of extruding, quick-cooling and cutting, have bigger production capacity.

For achieving the above object, according to a kind of plastics granulating method by processes of extruding, quick-cooling and cutting provided by the present invention, its technological thought is: with cold air or the cold air that contains frost at just imposing cooling rapidly from the plastic strip surface that the shaping mould head is extruded, and with the cutting knife fly-cutting, so can obtain the plastic cement granulation of water content hardly, and can improve production capacity.

With cold air the plastic strip of extruding is sprayed, though the effect that can obtain to cool off rapidly, but if all spray cooling at the molding die end face, molding die was lowered the temperature even produce the aforementioned phenomenon that blocks, if avoid the molding die cooling excessively, then the cold degree of cold air can not be too low, the extruded velocity of plastic strip will be eased up, with the cool time that need to obtain, cause production capacity to descend, lose inventor's original meaning greatly.

In other words, cold air must and avoid being sprayed onto molding die at the plastic strip of just having extruded as far as possible, so just can reach inventor's expected effect.

For reaching above-mentioned effect, the technological means of wound that the inventor grinds is: cold air is sprayed toward the knife edge front end from cutting knife, so, when the cutting knife fast rotational, cold air also imposes cooling rapidly at the most contiguous plastic strip in cutting knife the place ahead thereupon, condensed rapidly in its surface, and the air cooling of catching a cold of the blade of cutting knife but also keeps utmost point low temperature, so when the cutting plastic strip, also cut surface is cooled off, particles after the cutting can not be attached on cutting knife or die head, and because of all solidifying on its surface, so also unlikely be stained with mutually sticking, and since cold air only at the nearest plastic strip cooling that soon cuts to, so can plastic strip be cooled off extremely low temperature rapidly, and cold air can not continue the cooling forming die face, but the cold air that overflows with trace is inswept fast to the molding die end face, is unlikely to make the molding die cooling and influence plastic cement and extrude, so can effectively promote production capacity and quality.

Now for an embodiment and after cooperating graphic being described in more detail in, can darker understanding be arranged to purpose of the present invention, feature and effect via the explanation of this embodiment.

Fig. 1, the 2nd, existing with plastic cement extrusion granulator device schematic diagram.

Fig. 3 is the side view of cutting knife die head of the present invention.

Fig. 4 is the top view of Fig. 3.

Fig. 5 is the partial sectional view of Fig. 3.

Fig. 6 is a use schematic diagram of the present invention.

See also shown in Fig. 3 to 5, be cutting knife die head 20 used in the present invention, this cutting knife die head 20 has a discoidal body portion 21, central authorities from this body portion bottom surface establish an axis hole that does not run through 22, the openend of this axis hole 22 is established a joint 23, the end face central authorities of this body portion 21 are convexly equipped with an articulated section 24, equidistantly radially establishing hole 25, three footpaths toward central authorities respectively from these body portion 21 side faces with 120 degree is communicated with this axis hole 22, the outer end in this hole 25, three footpaths is sealed respectively, the end face of this body portion 21 is to setting firmly three pillars 26 respectively in 25 positions, hole, three footpaths, this three pillar 26 is equidistant with axis hole 22, its inside is respectively established a through hole 27 and is communicated with this hole, footpath 25, the end face of this three pillar 26 is respectively established a cutting knife 28, the blade of this three cutting knife 28 all is positioned at body portion 21 radially, and have identical cut direction when this body portion 21 rotates, this three pillar 26 respectively is provided with the spray orifice 29 and these through hole 27 conductings of predetermined number in abutting connection with its place, cutting knife 28 bottom surfaces.

During use, as shown in Figure 6, this cutting knife die head 20 is hubbed on the end face of a plastic cement extrusion granulator molding die 30 with articulated section 24,30 pairs of this molding dies should cutting knife die head 20 the rotational trajectory position of cutting knife 28 be provided with most moulding hole 31, be connected with the joint 23 of a universal joint 40 with these cutting knife die head 20 bottom surfaces in addition, 40 of this universal joints connect high pressure cold sources of supply 50 with a pipeline 41.This cutting knife die head 20 is subjected to external force in these molding die 30 end face fast rotational, the cold air that flows out by high pressure cold source of supply 50 then in regular turn by the road 41, universal joint 40, joint 23, axis hole 22, hole 25, footpath, through hole 27 is again by spray orifice 29 ejections, because the jet angle of spray orifice 29 is through design, can make the cold air of ejection just blow to cutting knife 28 knife edge the place aheads, and the rotation with cutting knife die head 20 circulates at the jet cooling of the plastic strip of being extruded by molding die 30, even the high-pressure stage cold air is sprayed onto glue and moulds its surperficial snap cure behind the bar, cutting knife 28 succeeded by cooling cuts into graininess with it, its cut surface is also solidified by the cold degree cooling of cutting knife 28 immediately, so can not be stained with sticking.

Solidified and water content not by the made particle surface of above-mentioned method for making, its quality is than good with the moisture content cooler.And owing to be to cool off rapidly at the part with cold air, therefore cold air that can utmost point low temperature cools off rapidly and molding die 30 excessive temperature is reduced, and the cold air of this kind rotary-jet can reduce molding die 30 temperature appropriateness again, make the plastic strip temperature of extruding near solidification temperature, therefore promptly condense rapidly in its surface of chance cold air, more help a large amount of productions fast, have industrial value.

In addition, if desire more to improve production capacity, can make the cold air of ejection contain frost, so when the cold air that contains frost is sprayed plastic strip, fine frost will stick to the plastic strip surface and it is condensed rapidly, through cutting knife cut off granulate drop after, the fine frost of its surface adhesion be heated be melted into water again absorbing particles inside waste heat and be vaporized into water vapour, this measure can be applicable to greater amount production process fast, the plastic strip surface of extruding is cooled off rapidly by more than 100 high temperature of spending, and product surface still can be kept the fine quality that does not almost have moisture.

In sum, the present invention reaches with truly feasible technological means and produces the purpose of the good plastic cement granulation of water content hardly in a large number fast.

Claims (1)

1, a kind of plastics granulating method by processes of extruding, quick-cooling and cutting, be to adorn a plastic cement extrusion molding die head at the discharge port end of extruder, and at this molding die end face cutting knife that is pivoted, this molding die is provided with the moulding hole to should cutting knife sweeping the track plane of cutting, the melt plastic cement material of extruding from extruder is strip through molding die moulding hole and extrudes, and swept by cutting knife to cut and be graininess, it is characterized in that: spray toward the knife edge front end from cutting knife with cold air, mat cutting knife rotation and cold air is imposed cooling rapidly at the plastic strip surface of cutting knife front end, condensed rapidly in its surface, and the air cooling of also catching a cold of the blade of cutting knife but keeps low temperature, make its cutting during plastic strip also to the cut surface cooling, the plastic cement particle surface after the cutting is solidified fully.

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