CN216139361U

CN216139361U - Injection screw rod applied to PET mixing

Info

Publication number: CN216139361U
Application number: CN202122084857.4U
Authority: CN
Inventors: 张华君; 谢于锰; 周胜武
Original assignee: Guangdong Lijin Plastic Machinery Intelligent Manufacturing Co ltd
Current assignee: Guangdong Lijin Plastic Machinery Intelligent Manufacturing Co ltd
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2022-03-29
Anticipated expiration: 2031-08-31

Abstract

The application discloses be applied to mixed injection screw rod of PET, include: the body of rod, the surface of the body of rod is provided with pay-off double thread, pay-off double thread extends to the front end of the body of rod, the front end of the body of rod is followed the axial of the body of rod has set gradually two mixing heads, has crossed the rubber component, two mixing heads with pay-off double thread butt joint, cross the rubber component set up to the play of the body of rod is glued and is held. This be applied to injection screw that PET was mixed, this injection screw can be high-efficient quick with PET raw materials misce bene even to can fully extrude out the raw materials in the screw rod, show to improve and penetrate gluey volume.

Description

Injection screw rod applied to PET mixing

Technical Field

The utility model relates to the technical field of injection molding machines, in particular to an injection screw applied to PET mixing.

Background

The material melting of injection molding machine is realized through the melten gel section of thick bamboo subassembly, and the melten gel section of thick bamboo subassembly is carried the material forward through internally mounted's screw rod, recycles the device that generates heat and melts the material. PET is a raw material with high melt viscosity, poor fluidity, high strength, good transparency and light weight, and the fluidity and the mixing performance of the PET are not changed greatly even if the injection pressure and the melt rotating speed are increased in the injection molding process. In addition, the molding temperature of PET is very close to the thermal decomposition temperature, the temperature range in which molding can be performed is relatively narrow, and PET is a temperature raw material which is difficult to mold. When an injection molding machine using a conventional injection screw rod is used for injection molding PET (polyethylene terephthalate) to produce products, temperature control abnormity of a higher degree can occur, and meanwhile, because the rubber material cannot be completely extruded from a rubber melting cylinder in time, the serious defects of poor surface gloss, yellowing, black spots and the like of the products can be caused.

SUMMERY OF THE UTILITY MODEL

Objects of the utility model

The utility model aims to provide an injection screw applied to PET mixing, which can efficiently and quickly mix and melt PET raw materials uniformly, can fully extrude the raw materials in the screw and obviously improve the injection amount.

(II) technical scheme

In order to achieve the purpose, the technical scheme provided by the utility model is as follows:

the injection screw rod applied to PET mixing comprises a rod body, wherein double feeding threads are arranged on the surface of the rod body and extend to the front end of the rod body, double mixing heads and a rubber head assembly are sequentially arranged at the front end of the rod body along the axial direction of the rod body, the double mixing heads are in butt joint with the double feeding threads, and the rubber head assembly is arranged as a rubber outlet end of the rod body.

In some embodiments, the feeding double thread comprises: the screw pitch of pay-off main thread, the vice screw thread of compounding, the screw pitch of pay-off main thread is greater than the screw pitch of the vice screw thread of compounding, and, the vice threaded connection of compounding is in pay-off main thread with between the two mixing heads.

In some embodiments, the screw compression ratio of the feeding main thread and the mixing auxiliary thread is set to be 2.6-3.2.

In some embodiments, the dual mixing head comprises: the all-pass type mixing head is provided with an all-pass thread groove, and two ends of the all-pass thread groove are communicated with the rod body; the semi-general type mixing head is provided with a semi-through thread groove, one end of the semi-through thread groove is communicated with the rod body, and the notches of the two adjacent semi-through thread grooves are arranged in a reverse direction.

In some embodiments, the all-pass mixing head is connected between the gap head assembly and the semi-pass mixing head, which is connected between the feed double flights and the all-pass mixing head.

In some embodiments, there is one full-through mixing head and one half-through mixing head.

Compared with the prior art, the injection screw applied to PET mixing provided by the utility model has the following beneficial effects:

this should be used for the mixed injection screw rod of PET, through optimizing into material section and compression section, make its best effect of performance when processing PET, before getting into the screw rod front end, PET has obtained good melting and exhaust, after the material gets into the vice screw thread of compounding, the molten sizing material obtains preliminary mixing, after the mixed section of the semi-open of back again, can make the material misce bene unanimous to the sizing material makes making a round trip to flow, at last the mixed effect of further enhancement of the mixed head of rethread formula, at last through the rubber head subassembly, the extrusion of screw rod, the raw materials is once only jetted out, the time of staying in the screw rod has been reduced, make it accord with PET's injection requirement.

Drawings

FIG. 1 is a schematic structural diagram of a front end of an injection screw for PET compounding according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an injection screw for PET mixing according to an embodiment of the present invention;

reference numerals:

1. a rod body; 2. feeding main threads; 3. auxiliary screw threads for mixing materials; 4. a full-through mixing head; 41. a full through thread groove; 5. a semi-general type mixing head; 51. a half-way thread groove; 6. and (7) passing through a glue head assembly.

Detailed Description

The technical scheme and the beneficial effects of the utility model are clearer and clearer by further describing the specific embodiment of the utility model with the accompanying drawings of the specification.

Referring to fig. 1-2, an injection screw for PET mixing according to the present embodiment includes: the device comprises a rod body 1, a feeding double-thread, a double mixing head and a rubber head assembly 6. Wherein, the surface of the body of rod 1 is provided with the pay-off double thread, and the pay-off double thread extends to the front end of the body of rod 1, and the front end of the body of rod 1 has set gradually two mixing heads along the axial of the body of rod 1, has crossed the rubber head subassembly 6, and two mixing heads and the butt joint of pay-off double thread cross the rubber head subassembly 6 and set up to the play of the body of rod 1 and hold. Wherein, the double screw threads of the feeding are arranged as the feeding section, the double mixing heads are arranged as the compression section and used for the butt joint

As shown in fig. 1 and 2, in the present embodiment, the feeding double thread includes: the feeding main thread 2 and the mixing auxiliary thread 3 are arranged, the thread pitch of the feeding main thread 2 is larger than that of the mixing auxiliary thread 3, and the mixing auxiliary thread 3 is connected between the feeding main thread 2 and the double mixing heads. Therefore, a double-thread structure with different screw pitches is formed by matching the feeding main thread 2 with the mixing auxiliary thread 3, most of molten plastics in the screw can be fully mixed and scattered uniformly, so that PET (polyethylene terephthalate) is well melted and exhausted before the materials enter the double mixing heads at the front end of the injection screw, and only a few unmelted solid materials are left.

In the embodiment, the screw compression ratio of the feeding main thread 2 and the mixing auxiliary thread 3 is set to be 2.6-3.2. Therefore, the double-thread structure in the compression ratio of the screw can fully mix and uniformly break up most of the molten plastics in the screw.

As shown in fig. 1 and 2, in the present embodiment, the double kneading heads include: a full-through type mixing head 4 and a semi-through type mixing head 5. The all-through mixing head 4 is provided with an all-through thread groove 41, and both ends of the all-through thread groove 41 are communicated with the rod body 1. The semi-general mixing head 5 is provided with a semi-through thread groove 51, one end of the semi-through thread groove 51 is communicated with the rod body 1, and the other end of the semi-through thread groove 51 is sealed. And, the notches of the adjacent two halves of the through-thread grooves 51 are oppositely arranged. Thus, both ends of the full-pass screw groove 41 of the full-pass type kneader 4 can pass through the rubber directly, while the half-pass screw groove 51 of the half-pass type kneader 5 can pass through only half the amount of the rubber.

In this example, the all-pass mixer 4 is connected between the applicator head assembly 6 and the half-pass mixer 5, and the half-pass mixer 5 is connected between the feed double screw and the all-pass mixer 4. Therefore, after the materials enter the auxiliary mixing threads, the materials are further mixed, so that various properties of the materials are further consistent, and finally the materials pass through the semi-general mixing head, and after the full-through mixing head, the mixing effect of the materials can completely meet the plasticizing condition requirement of the PET rubber material. Finally, the raw materials are ejected once through the non-return extrusion function of the rubber head assembly of the screw, so that the stay time in the screw is reduced, and the injection requirement of PET is met.

As shown in FIG. 2, in this embodiment, each injection screw is provided with a feed main flight 2, a mixing sub-flight 3, a half-through mixer head 5, a full-through mixer head 4, and a through-head assembly 6. Wherein, the feeding main thread 2 and the mixing auxiliary thread 3 are arranged as a feeding section, and the semi-general type mixing head 5 and the full-through type mixing head 4 are arranged as a compression section.

The injection screw used for mixing PET shown in this example is optimized for the feeding section and the compression section to perform the best function in processing PET, and the PET is melted and exhausted well before entering the compression section at the front end of the injection screw. Specifically, after the material enters the mixing auxiliary thread 3 along the feeding main thread 2, the molten rubber material is primarily mixed through the mixing auxiliary thread 3; then, the rubber material after preliminary mixing enters a semi-general mixing head 5 along the auxiliary mixing threads 3, and the rubber material flows back and forth through the semi-general mixing head 5, so that the materials can be uniformly mixed; then, the uniformly mixed materials flow from the semi-general type mixing head 5 to the full-general type mixing head 4, and the mixing effect is further enhanced through the full-general type mixing head 4, so that the materials which are mixed efficiently are obtained; and finally, the mixed materials can be ejected once by pushing through the rubber head assembly 6 and the injection screw, so that the retention time of the raw materials in the injection screw is reduced, and the injection requirements of PET are met.

In summary, the present invention aims to protect an injection screw applied to PET mixing based on the technical features disclosed above, wherein a feeding screw thread 2 is arranged on a rod body 1, a mixing auxiliary screw thread 3, a semi-general type mixing head 5 and a full-through type mixing head 6 are sequentially arranged at the front end of the rod body 1, and the feeding section and the compression section are optimized to exert the best effect when processing PET.

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the utility model and are not to be construed as limiting the utility model. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.

Claims

1. An injection screw for PET mixing, which is characterized by comprising:

the body of rod, the surface of the body of rod is provided with pay-off double thread, pay-off double thread extends to the front end of the body of rod, the front end of the body of rod is followed the axial of the body of rod has set gradually two mixing heads, has crossed the rubber component, two mixing heads with pay-off double thread butt joint, cross the rubber component set up to the play of the body of rod is glued and is held.

2. An injection screw for PET compounding according to claim 1, wherein:

the pay-off double thread includes: the screw pitch of pay-off main thread, the vice screw thread of compounding, the screw pitch of pay-off main thread is greater than the screw pitch of the vice screw thread of compounding, and, the vice threaded connection of compounding is in pay-off main thread with between the two mixing heads.

3. An injection screw for PET compounding according to claim 2, characterized in that:

the compression ratio of the screw rods of the feeding main thread and the mixing auxiliary thread is set to be 2.6-3.2.

4. An injection screw for PET compounding according to claim 1, wherein:

the double mixing head comprises: the all-pass type mixing head is provided with an all-pass thread groove, and two ends of the all-pass thread groove are communicated with the rod body; the semi-general type mixing head is provided with a semi-through thread groove, one end of the semi-through thread groove is communicated with the rod body, and the notches of the two adjacent semi-through thread grooves are arranged in a reverse direction.

5. An injection screw for mixing PET as claimed in claim 4, wherein:

the full-through mixing head is connected between the rubber head assembly and the semi-through mixing head, and the semi-through mixing head is connected between the feeding double threads and the full-through mixing head.

6. An injection screw for mixing PET as claimed in claim 4, wherein:

the mixing head of full through type is provided with one, half general formula mixing head is provided with one.