TW201315586A - Mold for manufacturing hollow plastic unit and product thereof - Google Patents

Abstract

This invention comprises a first mold and a second mold oppositely matched with each other. The opposite matching sides of the two molds are respectively concavely formed with a cavity part, and a material holding part is formed around the cavity parts of the opposite matching sides of the two molds. Furthermore, the side edge of the material holding parts of the opposite matching sides of the two molds are inclinedly disposed with a guiding face respectively. Two guiding faces of the opposite matching sides of the two molds are formed therebetween with a squeezing flow channel, and the minimum distance between the squeezing flow channel must be smaller than the minimum distance between the two material holding parts, so as to enable the unsolidified molten plastic blank to be squeezed by the squeezing flow channel to be backward squeezed into the cavity parts of the two molds, thereby making the cross-section at the parting line of the hollow plastic unit manufactured by the aforementioned two molds formed with a solid rib protruding toward inside.

Description

Mold for hollow plastic unit and its finished product

The invention belongs to the technical field of manufacturing hollow plastic products, in particular to a mold capable of manufacturing hollow plastic units and finished products thereof.

According to the mold construction of the conventional hollow plastic product, please refer to FIG. 1 to FIG. 4, which mainly comprises a first mold 1 and a second mold 2, wherein the first mold 1 and the second mold 2 are mutually opposed. The function of the combination is that the in-mold hole 10 is formed in the first mold 1, and the protruding portion 11 is formed on the circumferential side of the cavity 10, and the cavity 10 and the cutting portion are opposite to the first mold 1. The inner mold 25 and the protruding cut portion 21 are respectively formed on the second mold 2 of the material portion 11, and therefore, at the time of manufacture, the cut portions 11, 21 of the two molds 1, 2 must be clamped. After the molten plastic expanded material P is melted, it must be pierced into the molten expanded plastic blank P which has been placed in the molds 1 and 2 by the injection tube 28 which has been placed in the mold 2, and is passed through the injection tube. 28 injecting a pressurized gas, forcing the pressurized gas to squeeze the molten expanded plastic blank P to completely conform to the inner surface of the two molds 1, 2 (ie, forcing the molten expanded plastic blank P) The outer surface of the inner surface of the two sides is pressed by the pressurized air to form an outwardly curved arc-shaped pressure port A', which is connected The effective cross-sectional area of the surface becomes smaller, as shown in Fig. 3), which is formed after cooling and solidification to form a primordial blank, and the irregular burr which has been located on the circumference side of the primordial blank is cut off by cutting. Completion of a hollow plastic unit A; the above invention can achieve the original purpose of the invention, and is highly praised by the industry and the general operators, but in view of the industry's continuous innovation in research and development and technological innovation In order to make the applicants work harder to study and improve, and make it perfect and practical; in addition, the inventors have responded with numerous updates to the experimental tests and the actual use of the consumers, and found that the following problems still exist. To be further improved:

1. Since the hollow plastic unit will be trimmed and removed by the cutter before the finished product, the irregular edge of the peripheral side of the hollow plastic unit will be removed, so that the cross-sectional area of the cut surface which is located at the parting line of the hollow plastic unit Relatively small (ie only slightly intimate contact), therefore, when the position of the parting line already on the hollow plastic unit happens to collide or hit something, it is quite easy to crack from the joint of the parting line ( As shown in Figure 4), it makes it impossible to use it again.

2. As mentioned above, when the hollow plastic unit is exposed to sunlight for a long period of time, the material of the hollow plastic unit becomes less elastic or weaker due to the action of ultraviolet rays, and the air already located therein is added. The molecule is subjected to high temperature, so that the active impact force of the molecule is more active, so that the pressure generated in the molecule will form a rupture from the position of the parting line of the hollow plastic unit, so that it can no longer be used. It is a big problem.

In view of the above, the present invention proposes a mold for manufacturing a hollow plastic unit and a finished product thereof in order to effectively overcome the above problems in order to benefit all consumers and manufacturers in view of the above-mentioned shortcomings of the prior art.

The main content of the mold for manufacturing a hollow plastic unit of the present invention and the finished product thereof is to provide a guiding surface which is formed obliquely by the side edges of the cutting portion which are located on the side opposite to the two molds, and between the two guiding surfaces A forced flow path is formed, and the minimum distance between the forced flow passages must be smaller than the minimum distance between the two cutting portions, so that the melted and unsolidified plastic blank is pressed by the crowded flow passage Squeezing into the cavity portion of the two molds, so that the inner side of the section at the parting line of the hollow plastic unit manufactured by the two molds has a solid rib protruding convexly toward the inner side, so that it can not only The inner side surface at the position of the parting line of the hollow plastic unit is formed into a solid rib, and the joint area and the joint strength at the parting line can be surely increased, and at the same time, the impact force it receives can be increased, thereby increasing the service life thereof. It is its progressive claim.

The invention relates to a mold for manufacturing a hollow plastic unit and a finished product thereof, as shown in FIG. 5 to FIG. 11 , which mainly comprises a first mold 3 and a second mold 4 having opposite bodies, and the above two molds The inner side of the cavity portion 40 of the second mold 4 can be assembled with the inner module 45 as a basis for changing the appearance of the hollow plastic unit 5; Further, the two molds 3 and 4 are formed with the cutting portions 31 and 41 on the periphery of the cavity portions 30 and 40 on the side, and the two molds 3 and 4 are opposed to the cutting portions 31 and 41 on the side. The edges are respectively formed with obliquely disposed guiding surfaces 32, 42; in addition, the two molds 3, 4 are formed between the two guiding surfaces 32, 42 on the side to form a forced flow passage B, and the flow passage B is squeezed. The minimum distance B1 must be smaller than the minimum distance D1 formed between the two cutting portions 31, 41, so that the melted undried plastic blank P can be squeezed into the above by the squeeze of the forced flow passage B. In the cavity portions 30, 40 of the molds 3, 4, the parting line of the hollow plastic unit 5 manufactured through the two molds 3, 4 The inner side of the section at C is formed with solid ribs 50 projecting outwardly; and the above-mentioned guide faces 32, 42 may be arranged in parallel or non-parallel to be optimal; and the above-mentioned forced flow path B The width is optimal for equidistance; and the minimum distance D1 formed between the two cutting portions 31, 41 is smaller than the minimum distance E1 formed between the top faces 33, 43 of the two molds 3, 4; When the hollow plastic unit 5 is to be manufactured, it is necessary to first knead the bottom of the molten expanded plastic billet P which is slowly dropped from the mechanical die (not shown), and the gas injected into the plastic billet P is not Will lose and make the expanded plastic blank P move down to the first and second molds 3, 4. At this time, after the standby device is operated, the first and second molds 3, 4 can be oriented toward each other and toward the expanded plastic. The direction of the billet P is moved, and the top end surface 43 of the second mold 4 has been passed over the longitudinal line of the cutting portion 31 of the first mold 3 (as shown in FIG. 6), so that the two molds 3 and 4 are guided. Forming an equal distance width of the forced flow passage B between the faces 32, 42 and allowing the forced flow passage B to be adjacent to both sides of the plastic blank P; If the two molds 3, 4 continue to move in the opposite direction, the distance between the guiding surfaces 32, 42 will be made closer, in other words, the width of the forced flow passage B will be made narrower. The top surface of the two molds 4 and the guiding surface 42 are moved in the direction of the guiding surface 32 of the first mold 3, and the plastic blank P which has been located in the forced flow passage B of the original width is subjected to the second guiding surface 32, 42 forces are squeezed, causing the plastic billet P to start to extrude at both ends of the forced flow passage B (i.e., a part of the plastic billet P is pushed into the top faces 33, 43 of the two molds 3, 4 In the distance between the spaces, and the other part of the plastic billet P is pushed backward into the distance between the cutting portions 31, 41 of the two molds 3, 4), so that another plastic billet P will be First, it is placed in the minimum distance D1 between the cutting portions 31 and 41 of the two molds 3 and 4, and then squeezed into the inner side of the two molds 3 and 4 and extended toward the inner side to form a small protrusion. The solid rib 50 (as shown in FIG. 7), at this time, after moving the two molds 3 and 4 to move toward each other, the guiding faces 3 of the two molds 3 and 4 are forced. 2. The distance between 42 is minimized (that is, the width of the crowded runner B is also narrowest), and the force between the two guide faces 32 and 42 is forced to be squeezed more, resulting in The plastic blank P located in the forced flow path B is also extruded from both ends thereof (i.e., a portion is squeezed into the minimum distance E1 between the top faces 33, 43 of the two molds 3, 4, and the other portion It will be squeezed backward into the minimum distance D1 between the cutting portions 31, 41 of the two molds 3, 4), so that the other plastic blank P is again squeezed into the second cutting portion 31, The inner distance of the minimum distance D1 of 41 and the inner side of the two molds 3 and 4 is extended to form a large solid rib 50 (Fig. 8). Finally, the injection tube which has been placed in the second mold 4 is reused. 48 penetrates into the expanded plastic blank P which has been placed in the two molds 3, 4, and then injects pressurized gas into the plastic blank P, forcing the plastic blank P to closely fit to the two molds. After the inner surface of 3, 4 is cooled, the hollow plastic unit 5 can be taken out by mold opening, or the irregular burr of the hollow plastic unit 5 can be scraped off by a cutter to complete In other words, the hollow plastic unit 5 manufactured through the above two molds 3, 4 has a parting line C formed on the surface thereof, and the hollow plastic unit 5 includes an inner layer 51, an outer layer 52, and a connection. The side edges 53 of the outer layers 51, 52 are formed with a parting line C at an appropriate portion of the inner layer 51, or the outer layer 52, or the side edges 53 of the hollow plastic unit 5; Forming a solid rib 50 protruding convexly toward the inner side, and can surely increase the bonding area and bonding strength at the parting line C, and at the same time, can increase the impact force it receives, thereby increasing the service life; Referring to FIG. 12, which is still another embodiment of the present invention, the main change is that the width of the original forced flow passage B formed by the parallel design of the two guiding surfaces 32 and 42 is changed to The two guiding surfaces 32, 42 are non-parallel, and the maximum distance between the two guiding surfaces 32, 42 near the cutting portions 31, 41 is greater than the two guiding surfaces 32 close to the top end surfaces 33, 43, The maximum distance of the end of 42, in other words, is close to the cutting parts 31, 4 The maximum distance of the end of the forced flow passage B of 1 may be greater than the maximum distance of the end of the forced flow passage B which is close to the top end faces 33, 43 (ie, the forced flow passage B is directed toward the tip end face 33 by the cutting portions 31, 41, The direction of 43 is gradually reduced. Further, the minimum distance B1 between the forced flow passages B must be smaller than the minimum distance D1 formed between the two cutting portions 31, 41, and formed between the two cutting portions 31, 41. The minimum distance D1 is less than the minimum distance E1 formed between the top faces 33, 43 of the two molds 3, 4 is optimal, so that the plastic blank P is subjected to the pinching action of the two guiding faces 32, 42 and will force A part of the plastic blank P is reversely squeezed into the minimum distance D1 between the two cutting portions 31, 41 and continues to extend toward the inner side of the two molds 3, 4 to form a large solid rib 50, so that The inner side of the section line at the parting line C of the hollow plastic unit 5 manufactured by the two molds 3 and 4 is formed with a solid rib 50 projecting convexly toward the inner side, and the bonding area at the parting line C can be surely increased. And the strength of the combination; therefore, the technical means and principles used therein have been described in detail in the above, and therefore will not be described here.

Referring to FIG. 13, which is still another embodiment of the present invention, the main change is that the distance between the two guiding faces 32 and 42 of the two die 3, 4 is the width of the original forced flow channel B. The change is such that the slider 6 is locked to the top end surface 43 of the second mold 4 by the locking member 7, and the front end of the slider 6 is formed with a sloped pushing surface 62 and the top end thereof is formed with a top surface 63. Wherein, the pressing surface 62 and the guiding surface 32 of the first mold 3 may be parallel or may be non-parallel to form the forced flow passage B. In other words, the forced flow passage B may have an equal width design. Or a design that is tapered from the end of the cutting portion 31 to the other end of the proximal end surface 33; further, the minimum distance B1 between the forced flow passages B (ie, the pushing surface 62 and the guiding surface 32) The minimum distance between the two must be smaller than the minimum distance D1 formed between the two cutting portions 31, 41, and the minimum distance D1 formed between the two cutting portions 31, 41 is smaller than the top surface 33 of the first mold 3 and the slider The minimum distance F1 formed between the top faces 63 of 6 is optimal, so that the plastic blank P is subjected to the pinching action of the guiding surface 32 and the pushing surface 62, and is forced. Part of the plastic blank P is reversely extruded into the minimum distance D1 between the two cutting portions 31, 41 and continues to extend toward the inner side of the two molds 3, 4 to form a large solid rib (in the figure) Not shown), so that the inside of the section at the parting line (not shown) of the hollow plastic unit (not shown) manufactured by the two molds 3, 4 and the slider 6 is formed to have an inwardly convex shape. The solid ribs are produced, and the bonding area and the bonding strength at the parting line can be surely increased; therefore, the technical means and principles used therein have been described in detail in the above, and therefore will not be described here.

Referring to FIG. 14 and FIG. 15, which is another embodiment of the present invention, the main change is that the original forced flow passage B is formed by the two guiding faces 32 and 42 of the two molds 3 and 4. The distance width is changed to be that the power supply unit 8 (which may be replaced by a pneumatic cylinder, a hydraulic cylinder, a motor, etc.) is locked to the top end surface 43 of the second mold 4 by the locking member 7, and the power supply is provided. The assembly 8 is coupled to one end of the slider 6 by a link 80, and the bottom end of the slider 6 is formed with a slide rail 64 to slide on the rail 44 of the second mold 4; further, the front end of the slider 6 is formed in a diagonal shape. The pushing surface 62 and the top end thereof are formed with a top surface 63, wherein the pressing surface 62 and the guiding surface 32 of the first mold 3 may be parallel or non-parallel to form the forced flow path B, in other words The forced flow passage B is of a design that can be of equal width or a design that is tapered from the end of the cutting portion 31 to the other end of the proximal end surface 33; further, the flow between the flow passages B is forced. The minimum distance B1 (ie, the minimum distance between the pushing surface 62 and the guiding surface 32) must be smaller than the minimum distance D1 formed between the two cutting portions 31, 41, and two The minimum distance D1 formed between the material portions 31, 41 is smaller than the minimum distance F1 formed between the top end surface 33 of the first mold 3 and the top surface 63 of the slider 6, so that the plastic blank P is guided by the guide surface. 32 and the pinching action of the pushing surface 62, and forcing a part of the plastic blank P to be squeezed into the minimum distance D1 between the two cutting portions 31, 41 and continuing to the two molds 3, 4 The inner extending protrusion is formed with a large solid rib (not shown), so that the hollow plastic unit (not shown) manufactured by the two molds 3, 4, the slider 6 and the power supply assembly 8 is The inner side of the section at the parting line (not shown) is formed with solid ribs protruding convexly toward the inner side, and can effectively increase the bonding area and bonding strength at the parting line; therefore, the technical means used thereof And the principle has been described in detail in the above content, so it will not be described here.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention; therefore, the features and spirits described in the scope of the present application are equally varied or modified. It is included in the scope of the patent application of the present invention.

3. . . First mold

30. . . Cavity

31. . . Cutting section

32. . . Guide surface

33. . . Top surface

4. . . Second mold

40. . . Cavity

41. . . Cutting section

42. . . Guide surface

43. . . Top surface

44. . . track

45. . . Inner module

48. . . Syringe

5. . . Plastic unit

50. . . Solid rib

6. . . Slider

62. . . Pushing face

63. . . Top surface

64. . . Slide rail

7. . . Locking element

8. . . Power supply component

80. . . link

B. . . Crowded runner

B1. . . shortest distance

C. . . Parting line

D1. . . shortest distance

E1. . . shortest distance

F1. . . shortest distance

P. . . Plastic blank

Figure 1 is a schematic cross-sectional view of a mold assembly of a conventional hollow plastic product.

Figure 2 is a cross-sectional state diagram of the hollow plastic product produced in Figure 1.

Figure 3 is an enlarged partial cross-sectional view of Figure 2.

Figure 4 is an enlarged partial cross-sectional view of Figure 3 after actuation.

Fig. 5 is a cross-sectional view showing the state of the mold assembly at the time of manufacture of the present invention.

Figure 6 is an enlarged partial cross-sectional view of Figure 5 when it is actuated.

Figure 7 is an enlarged partial cross-sectional view of Figure 6 when it is reactivated.

Figure 8 is a combined cross-sectional state diagram of Figure 5 after re-actuation.

Figure 9 is an enlarged partial cross-sectional view of Figure 7 after re-actuation.

Figure 10 is a cross-sectional view of the finished product produced in Figure 8 and a partial enlarged view.

Figure 11 is a partial cross-sectional view of the mold after the re-actuation of Figure 9.

Figure 12 is a cross-sectional view showing a mold assembly according to still another embodiment of the present invention.

Figure 13 is a cross-sectional view showing a mold assembly according to still another embodiment of the present invention.

Figure 14 is a cross-sectional view showing a mold assembly of another embodiment of the present invention.

Figure 15 is a cross-sectional view showing a mold assembly according to still another embodiment of the present invention.

3. . . First mold

30. . . Cavity

31. . . Cutting section

32. . . Guide surface

33. . . Top surface

4. . . Second mold

40. . . Cavity

41. . . Cutting section

42. . . Guide surface

43. . . Top surface

45. . . Inner module

48. . . Syringe

5. . . Plastic unit

50. . . Solid rib

B. . . Crowded runner

C. . . Parting line

P. . . Plastic blank

Claims (10)

A mold for manufacturing a hollow plastic unit, comprising: a first mold and a second mold oppositely disposed, wherein the two molds are respectively recessed to form a cavity portion on the side, and the two molds are respectively arranged to face the cavity portion on the side A cutting portion is formed, and a side surface of the cutting portion facing the two molds is formed with an inclined guiding surface, and a forced flow path is formed between the two guiding surfaces of the two molds facing the side. The mold for manufacturing a hollow plastic unit according to claim 1, wherein the minimum distance between the forced flow passages must be smaller than the minimum distance between the two cutting portions. The mold for manufacturing a hollow plastic unit according to claim 2, wherein the forced flow passage is formed by paralleling the two guide surfaces to form a runner having an equal width or an equal distance. The mold for manufacturing a hollow plastic unit according to claim 2, wherein the forced flow path is formed by a non-parallel arrangement of the two guiding surfaces, and the forced flow path is cut by The material portion is tapered toward the tip end surface. The mold for manufacturing a hollow plastic unit according to the second aspect of the invention, wherein the forced flow passage is formed in a parallel manner by a pushing surface of the slider and a guiding surface of the first mold to form an equal width or the like. The runners of the distance. The mold for manufacturing a hollow plastic unit according to claim 1, wherein the forced flow passage is formed by a non-parallel arrangement between the pushing surface of the slider and the guiding surface of the first mold. The bundle shape and the forced flow passage are tapered from the direction in which the cutting portion faces the tip end surface. The mold for manufacturing a hollow plastic unit according to claim 5 or 6, wherein the slider is locked to the top end surface of the mold by a locking member, and the front end of the slider is formed with a diagonal push. The extruded surface and the top end thereof are formed with a top surface, and the minimum distance formed between the top surface and the top end surface of the mold must be greater than the minimum distance formed between the two cutting portions, and the minimum distance formed between the two cutting portions must be It is larger than the minimum distance formed between the pushing surface and the guiding surface. The mold for manufacturing a hollow plastic unit according to claim 5 or 6, wherein the slider is provided with a slide rail so as to be slidable on the rail of the mold, and the slider is connected to the power by a connecting rod. Supplying the component, and the power supply component is locked to the other mold by using the locking component; further, the front end of the slider is formed with a slanted pushing surface and the top end thereof is formed with a top surface, and the top surface and the above The minimum distance formed between the top faces of the mold must be greater than the minimum distance formed between the two cutting portions, and the minimum distance formed between the two cutting portions must be greater than the minimum distance formed between the pushing faces and the guiding faces. A finished product of a hollow plastic unit, comprising a hollow plastic unit and a parting line disposed on a surface of the hollow plastic unit, wherein the hollow plastic unit can be divided into an inner layer, an outer layer, and a side edge connecting the inner and outer layers; The inner side of the section of the parting line has been formed with solid ribs projecting toward the inner side to surely increase the bonding area and bonding strength at the parting line. The finished product of the hollow plastic unit according to claim 9, wherein the parting line is preferably located on the inner layer, or the outer layer, or the side.