CN111775386A - A kind of PVC two-color ball rotational molding die and rotational molding process thereof - Google Patents

Abstract

The invention discloses a PVC bicolor ball rotational molding die and a rotational molding process thereof, wherein the PVC bicolor ball rotational molding die comprises a top die, a middle die, a lower die and a die locking mechanism, the die is a hollow spherical die, the die is divided into the middle die and the lower die by a spherical central line, a circular through hole is formed in the top end of the middle die, a disc clamping part, a disc abutting part and a circular ring top part are coaxially arranged on the top die from bottom to top, and the disc clamping part is used for being installed in the circular through hole. The invention breaks through the history that the PVC rotational molding can only be performed in a single color, effectively improves the visual beauty of the product, the diversity and the market competitiveness of the product, and simultaneously improves the harmless contribution rate of the product to the environment.

Description

A kind of PVC two-color ball rotational molding die and rotational molding process thereof

technical field

The invention relates to the field of PVC rotational molding products, in particular to a rotational molding die for a PVC two-color ball and a rotational molding process thereof.

Background technique

The PVC rotational molding process is a plastic processing method that uses a rotating mold for processing. The processing process is that plastic powder or slurry is put into the mold, and the closed mold is rotated or swayed on the equipment. The outside of the mold is heated, and the plastic powder or slurry is turned and flowed inside the mold under heating. After the temperature reaches the softening point, it is gradually applied to the inner surface of the mold, melted and condensed, and the mold is placed in the natural environment or passed through. After cooling with water, mist, wind and other media, the mold is removed and the product is taken out.

The traditional process is a single-color PVC rotational molding process, which includes the following steps: 1) The mold is divided into two parts, the upper and lower molds; 2) The required color material is added to the mold at one time; 3) High temperature rotational molding; 4) Water cooling; 5) Mould opening and air forming; 6) Forming; 7) Inhalation packaging. However, in the modern age of rapid technological change, the traditional technological process has been unable to meet the customer's visual sense and purchasing needs.

Therefore, it is necessary to design and develop a new PVC two-color ball rotomolding mold and its rotomolding process that can meet customer needs and product diversity.

SUMMARY OF THE INVENTION

For solving the above-mentioned technical problems, the scheme adopted in the present invention is:

A PVC two-color ball rotational molding mold, including a top mold, a middle mold and a lower mold, the mold is a hollow spherical mold, the mold is divided into a middle mold and a lower mold by the center line of the spherical shape, and the middle mold is Inverted semicircular bowl shape, the top of the middle mold is provided with a circular through hole, the lower mold is in the shape of a semicircular bowl that is placed upright, and the middle mold and the lower mold are provided with step clips for mutual cooperation Interface, the top mold is coaxially provided with a disc clamping part, a disc abutting part and a ring top from bottom to top, and the disc abutting part is convex relative to the disc clamping part and the ring top set, the disc clamping part is used to be installed in the circular through hole, the diameter of the disc clamping part is consistent with the diameter of the circular through hole, and the disc abutting part is used for abutting Overlay on the middle mold.

Further, it also includes a clamping mechanism, the clamping mechanism includes a base, a screw and an iron plate for pressing the top mold, and two sides of the upper surface of the base are provided with nuts for matching with the screw head of the screw. The two sides of the iron plate are correspondingly provided with screw through holes for passing through the screw rods, the nut-type hollow sleeve piles on the same side are coaxially arranged with the screw through holes, and the pressing iron plate passes through the screw rods. It is arranged above the base, and the screws on both sides pass through the pressing iron plate through the backing ring and are screwed with the nut-type hollow pile pile.

Further, the bottom of the lower mold is in the shape of a round cake, and is provided with a vertical shaft for forming the inflatable hole of the PVC two-color ball; the inner wall of the top of the ring is a spiral structure; the disk clamping part and the disk abut The top and the top of the ring are integrally formed.

Further, when the mold is in the clamping state, the circumference of the outer wall of the engaging portion of the disc is closely fitted with the circumference of the inner wall of the circular through hole, and the exposed lower surface of the abutting portion of the disc is in close contact with the circumference of the upper die. The upper surface of the die is tightly fitted.

Further, the aperture is preferably 60-80 mm.

A rotational molding process of a PVC two-color ball rotational molding die, the process comprises the following steps:

1) Prepare the PVC two-color ball rotomolding mold;

2) After filling the first color material in the lower die, add a layer of special diaphragm at the die opening of the lower die to completely cover the die opening of the lower die, and add a cover on the top of the special diaphragm through the step card interface. mold;

3) After the second color material is injected into the middle mold through the circular through hole, the top mold is attached to the middle mold through the disc clamping part;

4) After assembling the top mold, middle mold and lower mold, put it on the base of the clamping mechanism, press the iron plate on the upper surface of the top mold, and rotate the top of the screw on both sides to drive the screw. The rod head is screwed into the inside of the nut-type hollow pile, thereby driving the screw rod to move down, and finally the top of the screw rod presses the iron plate through the backing ring, so that the iron plate is pressed against the top mold, and the mold clamping is completed;

5) After clamping and fixing the PVC two-color ball rotomolding mold with color material, push the rotomolding rotary machine to rotate at a high temperature of 360 degrees for a certain period of time;

6) After cooling, open the mold to inflate and pack it.

Further, in step 2), the special diaphragm is preferably a PVC film with a thickness of 0.25-0.35 mm.

Further, the PVC material of the special diaphragm and the PVC material of the colorant are of the same material.

Further, the color of the first color material and the color of the second color material are the same or different.

Further, in step 5), the high temperature is preferably 280-320° C., and the certain time is preferably 10-15 minutes.

The beneficial effects of the invention are as follows: the clamping mechanism of the invention provides a favorable basis for the rotary baking after the mold is clamped; the invention breaks through the history that PVC rotational molding can only be done in one color, and cannot be molded in two colors at one time; The rotational molding products produced by the processing technology of the present invention have outstanding visual perception on the outer surface and have visual beauty; the present invention enriches the types of PVC rotational molding products and improves the market competitiveness of the products; the processing technology of the present invention not only works reliably, It also has the beneficial effects of cleanliness, cleanliness and high efficiency, and truly meets the requirements of green environmental protection and intelligence, and improves the harmless contribution rate of this product to the environment.

Description of drawings

Fig. 1 is the structural schematic diagram of the PVC two-color ball rotational molding die of the present invention.

FIG. 2 is a schematic structural diagram of a top mold of the present invention.

FIG. 3 is a schematic diagram of the structure of the middle mold of the present invention.

FIG. 4 is a schematic structural diagram of a lower die of the present invention.

In the picture: 1. Top die, 2. Middle die, 3. Lower die, 4. Center line, 5. Round through hole, 6. Step card interface, 7. Disc clamping part, 8. Disc abutting part , 9, the top of the ring, 10, the clamping mechanism, 11, the base, 12, the screw, 13, the iron plate, 14, the screw rod head, 15, the nut type hollow pile, 16, the screw hole, 17, the gasket , 18, the vertical axis, 19, the circumference of the outer wall, 20, the circumference of the inner wall, 21, the lower surface, 22, the upper surface of the die.

Detailed ways

As shown in Figure 1-Figure 3, a PVC two-color ball rotational molding mold includes a top mold 1, a middle mold 2 and a lower mold 3, the mold is a hollow spherical mold, and the mold is divided into a middle mold with a spherical centerline 4 2 and lower mold 3, the middle mold 2 is in the shape of an inverted semicircular bowl, the top of the middle mold 2 is provided with a circular through hole 5, the lower mold 3 is in the shape of a semicircular bowl that is placed upright, the middle mold 2 and the lower mold 3. A stepped card interface 6 is provided for mutual cooperation. The top mold 1 is coaxially provided with a disc clamping part 7, a disc abutting part 8 and a ring top 9 from bottom to top. The disc clamping part 7 and the ring top 9 are convexly arranged, the disc clamping part 7 is used to be installed in the circular through hole 5, and the diameter of the disc clamping part 7 is consistent with the diameter of the circular through hole 5, The disc contact portion 8 is used to contact and cover the middle mold 2 .

A PVC two-color ball rotomolding mold further includes a clamping mechanism 10. The clamping mechanism 10 includes a base 11, a screw 12 and an iron plate 13 for pressing the top mold 1. Both sides of the upper surface of the base 11 are provided with The nut-type hollow socket pile 15 is matched with the screw rod head 14 of the screw rod 12. The two sides of the iron plate 13 are correspondingly provided with through holes for the screw rod 12 to pass through the screw rod 12, and the nut-type hollow socket pile 15 on the same side communicates with the screw rod 12. The holes are coaxially arranged, the pressing iron plate 13 is arranged above the base 11 through the screw rod 12 , and the screws 12 on both sides pass through the pressing iron plate 13 through the backing ring 17 and are screwed with the nut type hollow pile pile 15 .

The bottom of the lower mold 3 is in the shape of a round cake, and is provided with a vertical shaft 18 for forming the inflatable hole of the PVC two-color ball; the inner wall of the top 9 of the ring is a spiral structure; the disk clamping part 7, the disk abutting part 8 and the ring The top 9 is integrally formed.

When the mold is in the clamping state, the outer wall circumference 19 of the disc clamping portion 7 is closely fitted with the inner wall circumference 20 of the circular through hole 5, and the exposed lower surface 21 of the disc abutting portion 8 is in close contact with the upper surface of the die opening of the upper die. 22 for a snug fit.

The hole diameter is preferably 60-80 mm.

A rotational molding process of a PVC two-color ball rotational molding die, the process comprises the following steps:

1) Prepare the PVC two-color ball rotomolding mold;

2) After filling the first color material in the lower die 3, add a layer of special diaphragm to the die opening of the lower die 3 to completely cover the die opening of the lower die 3, and pass the lower die 3 above the special diaphragm. It is connected with the step card interface 6 of the middle mold 2, and the middle mold 2 is covered;

3) After filling the second color material with the same amount and different color as the first color material into the middle mold 2 through the circular through hole 5, then add the top mold 1 to the middle mold through the disc clamping part 7 2 on;

4) After the top mold 1, the middle mold 2 and the lower mold 3 are assembled, put them on the base 11 of the clamping mechanism 10, press the iron plate 13 on the upper surface of the top mold 1, and rotate the screws 12 on both sides. The top of the screw rod 12 drives the screw rod head 14 of the screw rod 12 to be screwed into the nut-type hollow pile pile 15, thereby driving the screw rod 12 to move down, and finally the top of the screw rod 12 presses the iron plate 13 through the backing ring 17, so that the iron The plate 13 presses the top mold 1, and the mold clamping is completed;

5) After locking and fixing the rotomolding mold of the PVC double-color ball with the color material, push the rotomolding rotary machine to rotate at 300°C for 360 degrees and bake for 12 minutes. Through the action of the rotomolding rotary machine, the hollow PVC double-color ball is formed. semi-finished products;

6) After cooling, open the mold to inflate and inhale and pack;

In step 2), the special diaphragm is preferably a PVC film with a thickness of 0.25-0.35 mm, so that the injected colorant will not gather in one place.

The PVC material of the special diaphragm and the PVC material of the color material are the same material. The PVC two-color ball formed after demoulding can be inflated as long as the special diaphragm is pierced.

Claims (10)

1. The utility model provides a PVC bicolor ball rotational molding forming die, its characterized in that, includes top mould (1), well mould (2) and lower mould (3), the mould is hollow ball-type mould, the mould divide into well mould (2) and lower mould (3) with central line (4) of ball-type, well mould (2) are the semicircular bowl form of back-off, the top of well mould (2) is equipped with a circular through-hole (5), lower mould (3) are the semicircular bowl form of putting just, well mould (2) and lower mould (3) are equipped with step joint mouth (6) that are used for mutually supporting, top mould (1) is by lower to last coaxial disc joint portion (7), disc butt portion (8) and ring top (9) be provided with, disc butt portion (8) are for disc joint portion (7) and ring top (9) evagination setting, disc joint portion (7) are used for installing in circular through-hole (5), the diameter of the disc clamping portion (7) is consistent with the aperture of the circular through hole (5), and the disc abutting portion (8) is used for abutting and covering the middle die (2).

2. The PVC bicolor ball rotational molding mold according to the claim 1, further comprising a mold locking mechanism (10), the mold locking mechanism (10) comprises a base (11), a screw rod (12) and an iron plate (13) for pressing the top mold (1), two sides of the upper surface of the base (11) are provided with nut type hollow sleeve piles (15) which are matched with the screw rod heads (14) of the screw rods (12), screw rod (12) through holes for penetrating the screw rods (12) are correspondingly arranged on two sides of the iron plate (13), the nut type hollow sleeve piles (15) on the same side are coaxially arranged with the screw rod (12) through holes, the pressing iron plates (13) are arranged above the base (11) through screws (12), and the screws (12) on two sides penetrate through the pressing iron plates (13) through backing rings (17) and are in spiral fit with the nut type hollow sleeve piles (15).

3. The PVC bicolor ball rotational molding forming die as claimed in claim 1, wherein the bottom of the lower die (3) is in a round cake shape and is provided with a vertical shaft (18) for forming an inflation hole of the PVC bicolor ball; the inner wall of the circular ring top (9) is of a spiral structure; the disc clamping part (7), the disc abutting part (8) and the ring top part (9) are integrally formed.

4. The PVC bicolor ball rotational molding mold according to claim 1, wherein when the mold is in a mold locking state, the outer wall circumference (19) of the disc clamping portion (7) is tightly attached to the inner wall circumference (20) of the circular through hole (5), and the exposed lower surface (21) of the disc abutting portion (8) is tightly attached to the upper surface (22) of the die opening of the upper mold.

5. The PVC bicolor ball rotational molding mold according to the claim 1, wherein the aperture is preferably 60-80 mm.

6. A rotational molding process of a PVC double-color ball rotational molding mold is characterized by comprising the following steps:

1) preparing a PVC double-color ball rotational molding mould;

2) after a first pigment is filled in the lower die (3), a layer of special diaphragm is added at the die orifice of the lower die (3) to completely cover the die orifice of the lower die (3), and a middle die (2) is covered above the special diaphragm through a step clamping port (6);

3) after the second pigment is filled into the middle mold (2) through the circular through hole (5), the top mold (1) is filled onto the middle mold (2) through the disc clamping part (7);

4) after the top die (1), the middle die (2) and the lower die (3) are assembled, the top die, the middle die and the lower die are placed on a base (11) of a die locking mechanism (10), an iron plate (13) is pressed on the upper surface of the top die (1), the tops of the screws (12) on two sides are rotated to drive a screw rod head (14) of the screw (12) to be screwed into the nut type hollow sleeve pile (15), so that the screw (12) is driven to move downwards, and finally the top of the screw (12) is pressed on the iron plate (13) through a backing ring (17), so that the iron plate (13) is pressed on the top die (1) to complete die locking;

5) after the PVC double-color-ball rotational molding mold filled with the pigment is locked and fixed, the rotational molding rotating machine is pushed to rotate and bake for a certain time at high temperature of 360 ℃;

6) and after cooling, opening the die, inflating, forming, sucking air and packaging.

7. The rotational molding process of the PVC double-color ball rotational molding mold according to the claim 6, characterized in that in the step 2), the special diaphragm is preferably a PVC film with the thickness of 0.25-0.35 mm.

8. The rotational molding process of the rotational molding mold for the PVC double-color ball according to claim 7, wherein the PVC material of the special diaphragm and the PVC material of the colorant are the same material.

9. The rotational molding process of a PVC double-color ball rotational molding mold according to claim 6, wherein the first coloring material and the second coloring material have the same or different colors.

10. The rotational molding process of the rotational molding mold for the PVC bicolor ball as recited in claim 6, wherein in the step 5), the high temperature is preferably 280 ℃ to 320 ℃, and the certain time is preferably 10-15 minutes.

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