Intermediate strip color transparent endurance board co-extrusion die

Abstract

The utility model relates to the technical field of the production of resistance plate, and particularly relates to a middle strip color transparent resistance plate co-extrusion die, which comprises vertically symmetrical detachable upper and lower dies, the lower die is fixed to the bottom of the upper die, a discharge chute is arranged between the upper and lower dies, and a strip color mold core is fixed between the upper and lower dies, which is provided with a strip color feeding runner and a longitudinal runner in communication therewith. The utility model is characterized in that the strip color mold core, the directional flow guide pipe and the embedded groove are matched, so that the mold core can be quickly detached from between the upper and lower dies when the directional flow guide pipe is replaced, the old directional flow guide pipe can be detached from the mold core by pulling and inserting, and the new directional flow guide pipe can be replaced in place, so that the directional flow guide pipe can be replaced and maintained according to production requirements, the difficulty of directional flow guide pipe replacement operation can be reduced, and the production cost of replacement operation can be saved.

Description

Technical Field

[0001] This utility model relates to the field of polycarbonate sheet production technology, and in particular to a co-extrusion mold for a transparent polycarbonate sheet with a central stripe color. Background Technology

[0002] Transparent polycarbonate sheet is a high-performance polycarbonate sheet widely used in construction and industrial fields due to its excellent weather resistance, impact resistance, and light transmission. Transparent polycarbonate sheets with a central stripe are typically produced by heating the sheet material and the central stripe material into a molten state, then simultaneously extruding them through a co-extrusion die, resulting in a transparent polycarbonate sheet with stripes.

[0003] In existing co-extrusion dies for transparent polycarbonate sheets with a central stripe, the cross-sectional shape of the discharge channel for the central stripe is fixed during production and is difficult to replace individually. This means that when production needs change, the entire co-extrusion die needs to be replaced, which is relatively difficult to operate and has high replacement costs. Utility Model Content

[0004] In view of this, the purpose of this utility model is to propose a co-extrusion mold for transparent polycarbonate sheet with a middle stripe color, so as to solve the problem that the discharge channel of the middle stripe color is difficult to be replaced individually according to production needs.

[0005] To achieve the above objectives, this utility model provides a co-extrusion mold for a translucent polycarbonate sheet with a middle stripe, comprising a vertically symmetrical and detachable upper mold and a lower mold, wherein the lower mold is fixed to the bottom of the upper mold.

[0006] A discharge chute located between the upper and lower molds.

[0007] A striped mold core is fixed between the upper and lower molds, and has a striped feed channel and a longitudinal flow channel connected to it.

[0008] Several embedded grooves are arranged side by side between the longitudinal flow channel and the outside of the striped mold core, and a directional flow guide tube is detachably installed inside each groove, with one end of the directional flow guide tube extending into the inside of the discharge groove.

[0009] When replacing the directional flow guide tube, first remove the striped mold core, and then replace the directional flow guide tube.

[0010] Preferably, the co-extrusion die further includes:

[0011] Two second heaters are horizontally embedded in the stripe mold core, and the stripe feed channel is vertically located between the two second heaters.

[0012] Two heat insulation plates are horizontally embedded in the striped mold core, and the second heater is vertically located between the striped feed channel and the heat insulation plates.

[0013] Preferably, the discharge trough includes an arc-shaped compression cavity and a horizontal discharge cavity, wherein the compression cavity is horizontally located between the discharge cavity and the striped mold core.

[0014] Preferably, one end of the directional flow guide tube passes through the compression cavity along the melt flow direction and is inserted into the discharge cavity.

[0015] Preferably, the axial direction of the embedded groove is the same as the horizontal flow direction of the melt, and the inner diameter of the embedded groove gradually decreases along the melt flow direction.

[0016] Preferably, the striped mold core is threadedly fixed to both the upper and lower molds with several fastening bolts, and the top and bottom of the striped mold core are inclined surfaces with respect to the directional guide tube.

[0017] Preferably, the upper mold and the lower mold have the same structure. The upper mold further includes a melt feed channel at the bottom of the upper mold and a melt flow channel connecting the melt feed channel and the discharge channel. The melt feed channel and the melt flow channel together with the outside of the striped mold core to form a melt flow cavity.

[0018] Preferably, the melt flow cavity includes a horizontal chamber and an inclined chamber, and the height of the inclined chamber gradually decreases along the melt flow direction.

[0019] The beneficial effects of this utility model are:

[0020] This invention, through the fitting arrangement between the striped mold core, the directional flow guide tube, and the embedded groove, allows for quick disassembly of the mold core from between the upper and lower molds when the directional flow guide tube is replaced. The old directional flow guide tube can be removed from the mold core by a pull-in method, and the new directional flow guide tube can be replaced in place. This facilitates the replacement and maintenance of individual directional flow guide tubes according to production needs, reducing the difficulty of directional flow guide tube replacement operations and saving production costs associated with replacement operations. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional illustration of the present invention. Figure 1 ;

[0023] Figure 2 for Figure 1 Right view sectional view;

[0024] Figure 3 for Figure 2 An enlarged schematic diagram of part A in the middle;

[0025] Figure 4 for Figure 1 Left view sectional view;

[0026] Figure 5 This is a three-dimensional illustration of the present invention. Figure 2 ;

[0027] Figure 6 This is a three-dimensional illustration of the present invention. Figure 3 .

[0028] The diagram is marked as follows:

[0029] 1. Upper mold; 11. Melt feed channel; 12. Melt channel; 13. Mold lip; 14. Opening regulator; 15. First heater; 2. Lower mold; 3. Striped mold core; 4. Striped feed channel; 5. Longitudinal channel; 6. Inset groove; 7. Directional guide tube; 8. Discharge groove; 9. Second heater; 10. Heat insulation plate. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0031] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0032] like Figures 1 to 6 As shown, a co-extrusion mold for a translucent polycarbonate sheet with a middle stripe includes an upper mold 1 and a lower mold 2 that are vertically symmetrical and detachably installed, with the lower mold 2 fixed to the bottom of the upper mold 1.

[0033] The discharge groove 8 is located between the upper mold 1 and the lower mold 2.

[0034] A striped mold core 3 is fixed between the upper mold 1 and the lower mold 2, and has a striped feed channel 4 and a longitudinal flow channel 5 connected to it.

[0035] Several embedded grooves 6 are arranged side by side between the longitudinal flow channel 5 and the outside of the striped mold core 3. Directional guide tubes 7 are detachably installed inside each groove. One end of the directional guide tube 7 extends into the inside of the discharge groove 8. The external shape and size of all directional guide tubes 7 are compatible. However, the radial cross-sectional shape and size of the internal hollow cavity of all directional guide tubes 7 can be customized according to production needs. This can improve the high compatibility between the directional guide tube 7 and the embedded groove 6 and reduce the cost of using the directional guide tube 7 when it is changed according to production needs.

[0036] When replacing the directional flow guide tube 7, first remove the stripe core 3, and then replace the directional flow guide tube 7. In this way, according to the changes in the shape of the stripe in production requirements, the directional flow guide tube 7 with the corresponding radial cross-section shape and size can be replaced and installed in the embedded groove 6 on the stripe core 3. The operation is simple and efficient. It only requires removing the stripe core 3 and replacing the directional flow guide tube 7 on it with the directional flow guide tube 7 that matches the production requirements, and then installing the stripe core 3 in place. The operation is simple and efficient, and only the directional flow guide tube 7 needs to be replaced, which greatly saves replacement costs.

[0037] like Figure 2 and Figure 4 As shown, the co-extrusion die also includes:

[0038] Two second heaters 9 are horizontally embedded in the striped mold core 3, and the striped feed channel 4 is vertically located between the two second heaters 9.

[0039] Two heat insulation plates 10 are horizontally embedded in the striped mold core 3. The second heater 9 is vertically located between the striped feed channel 4 and the heat insulation plate 10. The heat insulation plate 10 can isolate the heat of the second heater 9 from the upper mold 1 and the lower mold 2, so as to avoid affecting the temperature of the polycarbonate sheet raw material melt flowing in the upper mold 1 and the lower mold 2, and thus increase the difficulty of temperature control of the polycarbonate sheet raw material melt.

[0040] This design allows the two second heaters 9 to simultaneously heat the melt in the stripe feed channel 4 and the longitudinal channel 5, keeping the melt temperature within a certain range and preventing the melt from cooling and hardening, which could block the stripe feed channel 4 and the longitudinal channel 5.

[0041] like Figure 2 , Figure 4 and Figure 6As shown, the discharge trough 8 includes an arc-shaped compression cavity and a horizontal discharge cavity. The compression cavity is horizontally located between the discharge cavity and the striped die core 3. The height inside the compression cavity gradually increases along the horizontal flow direction of the melt and then gradually decreases to be the same as the height of the discharge trough 8. This design can reduce the stress between the melt and the inner wall of the discharge trough 8 during melt flow, reduce the impact of high-pressure melt on the smoothness of the inner wall of the discharge trough 8, and also enable the smoothness and stability of the melt transitioning from the compression cavity to the discharge cavity, avoiding affecting the flatness of both sides of the extruded transparent polycarbonate sheet.

[0042] like Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, one end of the directional flow guide tube 7 passes through the compression cavity and is inserted into the discharge cavity along the melt flow direction. This ensures that when the striped melt is extruded from the directional flow guide tube 7, it can maintain linear stability, allowing the stripes to be evenly distributed within the transparent polycarbonate sheet and maintaining a high degree of straightness. It can also maintain the stability of the stripe interface shape, improving the production quality and aesthetics of the intermediate striped transparent polycarbonate sheet.

[0043] like Figures 2 to 6 As shown, the axial direction of the embedded groove 6 is the same as the horizontal flow direction of the melt, and the inner diameter of the embedded groove 6 gradually decreases along the melt flow direction. This design allows the direction of the directional guide tube 7 inserted into the embedded groove 6 to be consistent with the melt flow direction. In this way, the melt pressure in the longitudinal channel 5 can be used to improve the installation firmness of the directional guide tube 7 inside the embedded groove 6.

[0044] like Figure 1 , Figure 2 , Figure 4 and Figure 6 As shown, the striped mold core 3 is threadedly fixed to the upper mold 1 and the lower mold 2 by several fastening bolts, and the top and bottom of the striped mold core 3 are inclined surfaces with respect to the directional guide tube 7.

[0045] The upper mold 1 and the lower mold 2 have the same structure. The upper mold 1 also includes a melt feed channel 11 located at the bottom of the upper mold 1 and a melt flow channel 12 connected between the melt feed channel 11 and the discharge groove 8. The melt feed channel 11 and the melt flow channel 12 together with the outside of the striped mold core 3 to form a melt flow cavity.

[0046] The upper mold 1 also includes two first heaters 15 arranged horizontally and inclinedly within the upper mold 1, which are used to heat the melt in the melt feed channel 11 and the melt channel 12 respectively, so that the melt temperature in both is maintained within a certain range, so as to improve the extrusion stability of the transparent endurance sheet.

[0047] The die lip 13 is detachably installed on one side of the upper die 1. Half of the discharge groove 8 is located on the die lip 13. An opening adjuster 14 is vertically provided between the upper die 1 and the die lip 13 to adjust the vertical height of the die lip 13. In this way, the thickness of the transparent polycarbonate sheet can be indirectly adjusted during extrusion. The opening adjuster 14 used in co-extrusion dies is generally an adjusting screw. By turning the adjusting screw, pressure is directly applied to or the die lip 13 is pulled to change its height, thereby adjusting the opening size of the discharge groove 8.

[0048] The melt flow cavity includes a horizontal chamber and an inclined chamber. The height of the inclined chamber gradually decreases along the melt flow direction. The horizontal chamber corresponds to the horizontal surface outside the striped mold core 3, and the inclined chamber corresponds to the inclined surface outside the striped mold core 3. This design allows the pressure of the melt to gradually increase as the raw material of the transparent polycarbonate sheet flows to the discharge trough 8, improving the fluidity of the melt. It also allows air bubbles mixed in the melt to gradually precipitate to the contact surface between the melt flow cavity and the melt under pressure, so that they can be discharged along the way when the melt is extruded from the discharge trough 8, thus improving the quality of the transparent polycarbonate sheet.

[0049] Working principle: During the use of the intermediate striped transparent polycarbonate sheet, both the first heater 15 and the second heater 9 need to be turned on before the melt is fed into the melt feed channel 11 and run for a certain period of time before the polycarbonate sheet raw material melt and the striped raw material melt are fed into the melt feed channel 11 and the striped raw material feed channel 4, respectively. This prevents the melt temperature in the co-extrusion die from dropping too much and hardening. Half of the polycarbonate sheet raw material melt flows from the melt flow cavity in the upper die 1 to the discharge trough 8, and the other half flows from the melt flow cavity in the lower die 2 to the discharge trough 8. Finally, the two parts of the polycarbonate sheet raw material melt merge in the discharge trough 8 and are extruded together. At the same time, the striped raw material melt flows sequentially through the striped raw material feed channel 4 and the longitudinal channel 5, and is finally stably and evenly added to the polycarbonate sheet raw material melt that merges in the discharge trough 8 through several directional guide pipes 7, so that the extruded polycarbonate sheet... Several parallel and straight stripes are formed in the middle. If the cross-sectional shape or size of the middle stripe needs to be changed, it is only necessary to disassemble and remove the stripe die core 3, then push out the existing directional guide tube 7 on the stripe die core 3 from the inner groove 6, replace it with a directional guide tube 7 that meets the requirements, and then install the stripe die core 3 back in its original position. The operation is simple and only the directional guide tube 7 needs to be replaced. There is no need to replace the entire co-extrusion die. At the same time, directional guide tubes 7 with different inner cross sections can be installed on the same stripe die core 3 at the same time, so that the stripes in the same transparent polycarbonate sheet have different cross-sectional shapes, which improves the production adaptability of the co-extrusion die and the diversity of stripe extrusion. If the production thickness of the middle stripe transparent polycarbonate sheet needs to be changed, the opening adjuster 14 can be operated to apply pressure or pull the die lip 13 to change the height of the die lip 13, thereby adjusting the opening size of the discharge groove 8, which is to adjust the thickness of the extruded middle stripe transparent polycarbonate sheet.

[0050] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0051] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A co-extrusion mold for a translucent polycarbonate sheet with a central stripe, comprising a vertically symmetrical and detachably mounted upper mold (1) and lower mold (2), wherein the lower mold (2) is fixed to the bottom of the upper mold (1), characterized in that: A discharge chute (8) is provided between the upper mold (1) and the lower mold (2); A striped mold core (3) is fixed between the upper mold (1) and the lower mold (2), and a striped feed channel (4) and a longitudinal flow channel (5) connected thereto are provided on it; Several embedded grooves (6) are arranged side by side between the longitudinal flow channel (5) and the outside of the striped mold core (3), and a directional flow guide tube (7) is detachably installed inside the groove. One end of the directional flow guide tube (7) extends into the inside of the discharge groove (8). When replacing the directional flow guide tube (7), first remove the striped mold core (3), and then replace the directional flow guide tube (7).

2. The co-extrusion die for intermediate stripe transparent polycarbonate sheet according to claim 1, characterized in that, The co-extrusion die also includes: Two second heaters (9) are horizontally embedded in the stripe core (3), and the stripe feed channel (4) is vertically located between the two second heaters (9); Two heat insulation plates (10) are horizontally embedded in the striped mold core (3), and the second heater (9) is vertically located between the striped feed channel (4) and the heat insulation plate (10).

3. The co-extrusion die for intermediate stripe transparent polycarbonate sheet according to claim 1, characterized in that, The discharge trough (8) includes an arc-shaped compression cavity and a horizontal discharge cavity, wherein the compression cavity is horizontally located between the discharge cavity and the striped mold core (3).

4. The co-extrusion die for intermediate striped transparent polycarbonate sheet according to claim 3, characterized in that, One end of the directional flow guide tube (7) passes through the compression cavity along the melt flow direction and is inserted into the discharge cavity.

5. The co-extrusion die for intermediate stripe transparent polycarbonate sheet according to claim 1, characterized in that, The axial direction of the embedded groove (6) is the same as the horizontal flow direction of the melt, and the inner diameter of the embedded groove (6) gradually decreases along the melt flow direction.

6. The co-extrusion die for intermediate stripe transparent polycarbonate sheet according to claim 1, characterized in that, The striped mold core (3) is threadedly fixed with several fastening bolts between the upper mold (1) and the lower mold (2), and the top and bottom of the striped mold core (3) are inclined surfaces with respect to the directional guide pipe (7).

7. The co-extrusion die for intermediate stripe transparent polycarbonate sheet according to claim 1, characterized in that, The upper mold (1) and the lower mold (2) have the same structure. The upper mold (1) also includes a melt feed channel (11) located at the bottom of the upper mold (1) and a melt flow channel (12) connecting the melt feed channel (11) and the discharge groove (8). The melt feed channel (11) and the melt flow channel (12) together with the outside of the striped mold core (3) form a melt flow cavity.

8. The co-extrusion die for intermediate striped transparent polycarbonate sheet according to claim 7, characterized in that, The melt flow cavity includes a horizontal chamber and an inclined chamber, and the height inside the inclined chamber gradually decreases along the melt flow direction.

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