TWI650221B - Screw structure of mixing composite material - Google Patents

Abstract

The present invention provides a compounded screw structure for a composite material, comprising a feed section having a first stem portion and a first spiral portion disposed on an outer surface of the first stem portion, a shear section having a a second rod portion and a second spiral portion disposed on an outer surface of the second rod portion, a distribution portion having a third rod portion and a third spiral portion disposed on an outer surface of the third rod portion, the third rod portion Forming a third mixing space with the third spiral portion, the third mixing space receiving the composite material from the second mixing space, the third spiral portion being provided with at least one groove, when the composite material flows through the The third mixing space and through the at least one groove, the dispensing section dispenses the composite material with the third spiral and the at least one groove and conveys the composite.

Description

Mixing screw structure for composite materials

This invention relates to a screw structure, and more particularly to a compounded screw structure for a composite material.

In recent years, as polymer composite materials have been increasingly developed with the needs of the industry, various physical properties and mechanical properties of composite materials have also been improved with respect to a single material depending on the application, such as additives such as fibers and sheets. Or various chemical additives can be superior to the original materials under various formulations and processes; however, in the current process, the polymer composites need to be granulated by a twin-screw extrusion process, and then through other processes such as Injection molding, hot press forming, film extrusion process, etc., for the formation of secondary materials, manufacturing costs and time are required to be more than a number of processes, and in the process of consideration, a multi-process process of mixing process The mode of making composite materials not only reduces the manufacturing time effectively, but also reduces the cost and process cost of multiple sets of machines.

In the prior art, the composite material is extruded by granulation, and the additive material is mixed with the polymer substrate by the shearing and mixing ability, and then formed by other processes. However, this process mode not only has a long manufacturing time, but also causes the thermal properties of the polymer substrate to decrease due to temperature rise and temperature reduction again, resulting in poor properties of the composite material. Therefore, it is necessary to propose a new type of screw structure to solve the above problems.

The object of the present invention is to provide a mixing screw structure for a composite material, which utilizes a distribution section and a dispersion section to effectively reduce lengthy process time and cost, and is capable of secondary heating in a well-known process. The disadvantage of causing cracking of composite materials. Another object of the present invention is to provide a compounded screw structure for a composite material, which utilizes a distribution section to effectively split the composite material, thereby improving the distribution of the additive in the polymer material, so that each of the first The addition of the block is effectively distributed to various regions of the polymer material.

In order to achieve the above object, an embodiment of the present invention provides a compound screw structure for a composite material comprising: a feed section having a first stem portion and a first surface disposed on an outer surface of the first stem portion a spiral portion, the first rod portion and the first spiral portion form a first mixing space, and when the mixing screw structure drives the feeding portion to rotate, the feeding portion introduces the composite material to the first mixing Space and conveying the composite material in a flow direction; a shearing section connecting the feed section and cooperating with the feed section, having a second stem portion and being disposed on an outer surface of the second stem portion a second spiral portion, the second shaft portion and the second spiral portion forming a second mixing space, the second mixing space receiving the composite material from the feed section, the shearing section being the second a spiral portion shearing the composite material and conveying the composite material; and a distribution section connecting the shearing section and interlocking with the shearing section, having a third stem portion and being disposed on an outer surface of the third stem portion a third spiral portion, the third portion The third spiral portion forms a third mixing space, the third mixing space receives the composite material from the second mixing space, and the third spiral portion is provided with at least one groove, when the composite material flows through the third mixing The space distributes the composite material with the third spiral portion and the at least one groove and transports the composite material as it passes through the at least one groove.

In one embodiment, the composite material comprises a polymeric material and an additive.

In an embodiment, the first helical portion of the feed section is selected from the group consisting of a single pitch screw, a multi-pitch screw, and combinations thereof.

In one embodiment, the compounded screw structure for the composite material further includes a heating device coupled to the feed section to heat the composite.

In one embodiment, the angle between the at least one groove and a central axis of the mixing screw structure is between 30 and 150 degrees.

In one embodiment, the angle between the at least one groove and a central axis of the mixing screw structure is between 80 degrees and 100 degrees.

In one embodiment, the at least one trench includes a plurality of trenches disposed on the third spiral portion in an equidistantly distributed manner.

In an embodiment, the depth of the at least one groove is smaller than the radial thickness of the third spiral on the outer surface of the third shank.

In an embodiment, the third helical portion of the dispensing section is selected from the group consisting of a single pitch thread, a multi-pitch thread, and combinations thereof.

In one embodiment, the compounded screw structure for composite material further includes at least one dispersion section coupled to the distribution section and interlocked with the distribution section, having a fourth stem portion and disposed on the fourth stem a fourth spiral portion of the outer surface, the fourth shaft portion and the fourth spiral portion forming a fourth mixing space, the at least one dispersion portion receiving the composite material from the third mixing space, the at least one dispersion region The segment disperses the composite material with the fourth spiral portion and conveys the composite material.

In an embodiment, the at least one dispersion section comprises a dispersion section.

In an embodiment, the at least one dispersion section comprises a plurality of discrete sections.

100‧‧‧Feeding section

101‧‧‧Composite materials

101a‧‧‧Polymer materials

101b‧‧‧ Additives

102‧‧‧cut section

103‧‧‧ heating device

104‧‧‧Distribution section

106‧‧‧Distributed section

108‧‧‧ material management

110‧‧‧ openings

112a‧‧‧first pole

112b‧‧‧Second pole

112c‧‧‧third pole

112d‧‧‧Fourth

114a‧‧‧First spiral

114b‧‧‧second spiral

114b1‧‧‧ main thread

114b2‧‧‧Sub-tooth

114c‧‧‧ Third spiral

114d‧‧‧fourth spiral

116a‧‧‧First Mixed Space

116b‧‧‧Second mixing space

116c‧‧‧ third mixed space

116d‧‧‧Fourth mixing space

118‧‧‧ trench

200a‧‧‧ first block

200b‧‧‧Second block

AX‧‧‧ central axis

CH1‧‧‧ first channel

CH2‧‧‧ second channel

D‧‧‧Deep

FX‧‧‧flow direction

R‧‧‧Distributed area

T‧‧‧ radial thickness

Vx‧‧‧ relative speed

△z‧‧‧ spacing

W‧‧‧Width

Τ‧‧‧ shear stress

η‧‧‧Visco

Γ‧‧‧ shear rate

Θ‧‧‧ angle

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. FIG. 1 is a schematic diagram of a mixed material for composite materials in an embodiment of the present invention. Schematic diagram of the screw structure.

2 is a partially enlarged schematic view showing a feed section of a compound screw structure for a composite material in an embodiment of the present invention.

3 is a partially enlarged schematic view showing a shearing section of a compound screw structure for a composite material in an embodiment of the present invention.

4A is a partially enlarged schematic view showing a distribution section of a compound screw structure for a composite material in an embodiment of the present invention.

4B is a partially enlarged perspective view showing a distribution section of a compound screw structure for a composite material in an embodiment of the present invention.

FIG. 5 is a partially enlarged schematic view showing a dispersion section of a compound screw structure for a composite material according to an embodiment of the present invention.

6 is a schematic view showing the state of distribution and dispersion of the composite material in the mixed screw structure in the embodiment of the present invention.

Referring to the drawings, wherein like reference numerals refer to the same or the The following description is based on the specific embodiments of the invention as illustrated and should not be construed as limiting the invention. Other specific embodiments are detailed.

1 is a schematic view showing a structure of a mixing screw for a composite material in an embodiment of the present invention. The compounded screw structure for a composite material includes a feed section 100, a shear section 102, a distribution section 104, and at least one dispersion section 106. The feed section 100, the shear section 102, the distribution section 104, and the at least one dispersion section 106 are sequentially coupled together and rotated synchronously within a tube 108, the composite 101 being formed by the opening 110 of the tube 108 Introducing into the compounded screw structure, and sequentially transporting the composite material 101 from the feed section 100, the shear section 102, the distribution section 104, and the at least one dispersion section 106 along the flow direction FX to Material 101 is subjected to a one-time melt mixing and forming process. The mixed screw structure for composite materials of the invention effectively reduces the lengthy process time and cost, and is more suitable for the shortcoming of the composite material 101 caused by the secondary temperature rise in the process of the well-known technology. In one embodiment, the composite material 101 comprises a polymer material 101a (shown in FIG. 6) and an additive 101b (shown in FIG. 6), such as a polymer material-added sheet-type nano-clay. In one embodiment, the compounded screw structure for composite material further includes a heating device 103 coupled to the feed section 100 to heat the composite material 101 to facilitate the transfer of the composite material 101 and to mold the solid material. The purpose of the transformation.

As shown in FIG. 1 and FIG. 2, FIG. 2 is a partially enlarged schematic view showing the feeding section 100 of the compounding screw structure for the composite material 101 in the embodiment of the present invention. The feeding section 100 has a first rod portion 112a and a first spiral portion 114a disposed on an outer surface of the first rod portion 112a. The first rod portion 112a and the first spiral portion 114a form a first mixing space 116a. When the mixing screw structure drives the feeding section 100 to rotate, the feeding section 100 introduces the composite material 101 to the first mixing space 116a, and conveys the composite material 101 along a flow direction FX to the The section 102 is cut. In an embodiment, the first spiral portion 114a of the feeding section 100 is selected from a single pitch snail. Tooth, multi-pitch screw and combinations thereof, as shown in Figure 2, single-pitch thread.

As shown in FIG. 1 and FIG. 3, FIG. 3 is a partially enlarged schematic view showing a shearing section 102 of a compounding screw structure for a composite material according to an embodiment of the present invention. The cutting section 102 is connected to the feeding section 100 and is interlocked with the feeding section 100, and has a second rod portion 112b and a second spiral portion 114b disposed on an outer surface of the second rod portion 112b, the second portion The rod portion 112b and the second spiral portion 114b form a second mixing space 116b, the second mixing space 116b receives the composite material 101 from the feeding section 100, and the shearing section 102 is the second spiral portion The composite material 101 is sheared 114b and the composite material 101 is delivered to the distribution section 104.

As shown in FIG. 1 and FIG. 3, in an embodiment, the second spiral portion 114b includes a main screw 114b1 and a secondary screw 114b2, and the pitch of the main screw 114b1 is gradually narrowed along the flow direction of the composite material 101. The secondary thread 114b2 is gradually widened along the flow direction of the composite material 101, and the first rod portion 112a is tapered along the flow direction of the composite material 101. In the feed section 100, the solid material in the pitch of the main screw 114b1 is highly shear-plasticized, and the melt is returned to the pitch of the secondary screw 114b2, and the molten material is advanced from the secondary screw 114b2. In addition to the shear plasticization, the shearing section 102 also distinguishes the unplasticized solid from the plasticized melt through the design of the main screw 114b1 and the secondary screw 114b2 and ensures high shear exhaust gas to ensure material. The inlet distribution section 104 and the dispersion section 106 are both plasticized melts that are free of moisture.

τ = η * γ (E1), τ is defined as shear stress, η is defined as viscosity, and γ is defined as shear rate.

γ=Vx/Δz...(E2), Vx is defined as the relative speed of the mixed screw structure and the tube, and Δz is defined as the distance between the mixed screw structure and the tube.

As shown by E1, the shear stress equation shows that the material is at a fixed energy and temperature. In the case, the viscosity decreases as the shear rate increases, and is shown by E2. The shear rate equation shows that the shear rate of the material increases with the increase of the relative flow velocity of the screw at the fixed screw tube spacing. The shear stress and flow velocity in the analysis can define the viscosity of the material, while the decrease in the viscosity of the material means that the macromolecules in the long chain of the material change from high shear force or high flow velocity to short chain small molecules, molecular chain and molecular chain spacing. The widening allows the additive material to more easily form an intercalation distribution with the substrate, and disperses the agglomerate additives having better affinity with each other under the characteristics of the high shear screw.

As shown in FIG. 1 and FIG. 4A, FIG. 4A is a partially enlarged schematic view showing a distribution section 104 of a compound screw structure for a composite material according to an embodiment of the present invention. The distribution section 104 is connected to the cutting section 102 and is interlocked with the cutting section 102, and has a third rod portion 112c and a third spiral portion 114c disposed on an outer surface of the third rod portion 112c, the third rod The portion 112c and the third spiral portion 114c form a third mixing space 116c. The third mixing space 116c receives the composite material 101 from the second mixing space 116b. The third spiral portion 114c is provided with at least one groove 118. When the composite material 101 flows through the third mixing space 116c and passes through the at least one trench 118, the distribution section 104 distributes the composite material 101 with the third spiral portion 114c and the at least one trench 118 and The composite material 101 is delivered to the at least one dispersion section 106.

As shown in FIG. 1, FIG. 4A, FIG. 4B and FIG. 6, in an embodiment, the angle θ between the at least one groove 118 and a central axis AX of the mixing screw structure is between 30 degrees and Between 150 degrees. In a preferred embodiment, the angle between the at least one groove 118 and a central axis AX of the mixing screw structure is between 80 and 100 degrees. The third spiral portion 114c forms a helix angle with the central axis AX. The width of the at least one trench 118 is defined as W. The at least one trench 118 is configured to partition the composite material 101 along the first channel CH1 and the second channel CH2 to effectively split the composite material 101 (eg, the polymer material 101a and the additive 101b) to improve the additive 101b. As shown in Fig. 6, the dispensability of the polymer material 101a is effectively distributed to each region of the polymer material 101a in the additive 101b of each of the first blocks 200a.

As shown in FIG. 1 , FIG. 4A and FIG. 4B , in an embodiment, the at least one trench 118 includes two trenches 118 . For example, the plurality of trenches 118 are disposed on the third spiral portion 114 c in an equidistant manner. . In an embodiment, the depth D of the at least one groove 118 is smaller than the radial thickness T of the third spiral portion 114c on the outer surface of the third rod portion 112c. In an embodiment, the third helical portion 114c of the dispensing section 104 is selected from the group consisting of a single pitch thread, a multi-pitch screw, and combinations thereof.

As shown in FIG. 1 and FIG. 5, FIG. 5 is a partially enlarged schematic view showing a dispersion section of a mixed screw structure for a composite material according to an embodiment of the present invention. The dispersing section 106 is connected to the distribution section 104 and is interlocked with the distribution section 104, and has a fourth rod portion 112d and a fourth spiral portion 114d disposed on the outer surface of the fourth rod portion 112d. The fourth rod portion 112d Forming a fourth mixing space 116d with the fourth spiral portion 114d, the at least one dispersion section 106 receiving the composite material 101 from the third mixing space 116c, the at least one dispersion section 106 being the fourth spiral portion 114d The composite 101 is dispersed and the composite 101 is delivered. As shown in FIG. 5, the at least one dispersion section 106 is two dispersion sections 106, and the at least one dispersion section 106 may also be one dispersion section 106 or three or more dispersion sections. 106.

The two dispersion sections 106 as shown in FIGS. 1 and 5 form a lead angle at both edges of the fourth spiral portion 114d. When the polymer material flows through the fourth mixing space 116d of one dispersion section 106, the dispersion region R before entering the fourth mixing space 116d of the other dispersion section 106 can be dispersed between the additive 101b and the additive 101b. As shown in FIG. 6, the effect of dispersion between the additives 101b of the second block 200b is generated, and an agglomeration effect is prevented between the additives 101b to achieve a dispersion effect.

The mixed screw structure of the invention can be applied to a polymer composite material with high heat sensitivity, and has better mixing forming effect. Specifically, in the prior art, the additive of the polymer composite material is easily subjected to The problem of degradation and cracking is caused by the high shear heat, and in recent years, the rapidly degradable material cannot withstand the excessive heat of shear, which makes the polymer composite difficult to form. In contrast, the mixed screw structure of the present invention utilizes a single mixing of the distribution section and the dispersion section to improve the temperature rise of the additive of the polymer composite caused by the secondary heating in the prior art. The characteristics are such that the one-time blending of the present invention does not change the material properties of the temperature increase of the additive of the polymer composite.

In summary, the mixing screw structure of the present invention utilizes a distribution section and a dispersion section to effectively reduce lengthy process time and cost, and is more disadvantageous in the process of secondary heating caused by composite heating in the well-known process. .

While the invention has been described above in terms of the preferred embodiments, the invention is not intended to limit the invention, and the invention may be practiced without departing from the spirit and scope of the invention. The scope of protection of the present invention is therefore defined by the scope of the appended claims.

Claims (11)

A compound screw structure for a composite material, comprising: a feed section having a first stem portion and a first spiral portion disposed on an outer surface of the first stem portion, the first stem portion and the first stem portion a spiral portion forms a first mixing space, and when the mixing screw structure drives the feeding section to rotate, the feeding section introduces the composite material to the first mixing space, and conveys the composite along a flow direction a material; a shearing section connecting the feed section and interlocking with the feed section, having a second stem portion and a second spiral portion disposed on an outer surface of the second stem portion, the second stem portion Forming a second mixing space with the second spiral portion, the second mixing space receiving the composite material from the feed section, the shearing section shearing the composite material with the second spiral portion and conveying the composite a material, wherein the second spiral portion includes a main screw and a secondary screw that shears the composite material and returns the molten composite material to the secondary screw to discharge the molten gas of the composite material And an allocation section to connect to the Cutting the section and interlocking with the shearing section, having a third rod portion and a third spiral portion disposed on an outer surface of the third rod portion, the third rod portion forming a third mixture with the third spiral portion a third mixing space receiving the composite material from the second mixing space, the third spiral portion being provided with at least one groove, the molten composite material flowing through the third mixing space and passing through the at least one When the groove is formed, the distribution section distributes the composite material with the third spiral portion and the at least one groove and conveys the composite material, wherein the at least one groove is between a central axis of the mixed screw structure An angle between 30 degrees and 150 degrees; at least one dispersion section connecting the distribution section and cooperating with the distribution section, a fourth mixing space of the at least one dispersion section receiving from the third mixing space The composite material The composite is dispersed and the composite is delivered. A compounded screw structure for a composite material according to claim 1, wherein the composite material comprises a polymer material and an additive. The compounding screw structure for a composite material according to claim 1, wherein the first spiral portion of the feeding section is selected from the group consisting of a single pitch screw, a multi-pitch screw, and combinations thereof. . The compounded screw structure for a composite material according to claim 1, further comprising a heating device connected to the feed section to heat the composite material. The compounding screw structure for a composite material according to claim 1, wherein an angle between the at least one groove and a central axis of the mixed screw structure is between 80 degrees and 100 degrees. between. The compounding screw structure for a composite material according to claim 1, wherein the at least one groove comprises a plurality of grooves disposed on the third spiral portion in an equidistant distribution manner. The compounding screw structure for a composite material according to claim 1, wherein the depth of the at least one groove is smaller than a radial thickness of the third spiral portion on the outer surface of the third rod portion. . The compounded screw structure for a composite material according to claim 1, wherein the third spiral portion of the distribution section is selected from the group consisting of a single pitch screw, a multi-pitch screw, and combinations thereof. The compounding screw structure for a composite material according to claim 1, wherein the at least one dispersing section has a fourth shank portion and a fourth spiral portion disposed on an outer surface of the fourth shank portion, The fourth stem portion and the fourth spiral portion form the fourth mixing space, the at least one dispersing section dispersing the composite material with the fourth spiral portion and conveying the composite material. A compounded screw structure for a composite material according to claim 9 of the patent application, The at least one dispersion section includes a dispersion section. The compounded screw structure for a composite material according to claim 9, wherein the at least one dispersion section comprises a plurality of dispersion sections.