PVC BALL SHAPING PROCESS

Abstract

The present invention provides a method for shaping PVC balls, comprising the following steps: Step A: Performing a first ball body forming in a first mold from a PVC paste material using a rotational casting machine or a rotational molding machine to shape hollow PVC balls; Step B: Inflating the formed balls so that the outer diameter of the ball is equal to the diameter of an internal cavity of a second mold; Step C: Placing the inflated balls in a second mold, and then performing a second texture forming in the second mold on the inflated and formed balls using a rotational casting machine or a rotational molding machine, to shape textures on the surface of the formed PVC balls. This method makes it possible to shape PVC balls with predetermined patterns and predetermined textures. FIGURE IN THE ABSTRACT: Fig 1

Description

Title of the invention: METHOD FOR SHAPING PVC BALLS technical field

[0001] The present invention relates to the field of ball-shaping and manufacturing technology, in particular a process for shaping PVC balls. TECHNICAL CONTEXT

[0002] At present, in the production of PVC balls, plastic molding is used; however, to meet customer requirements on aesthetic or individual aspects of PVC balls, it is often necessary to print patterns and textures on the surface of the PVC balls. It is difficult for existing shaping processes to produce predetermined textures on the surface of PVC balls, and even more difficult to print predetermined patterns on the surface of PVC balls. DISCLOSURE OF THE INVENTION

[0003] The present invention aims to provide a method for shaping PVC balls, enabling the shaping of PVC balls with predetermined patterns and predetermined textures, thus solving the technical problems of existing technologies such as the difficulty of forming textures and the difficulty of forming textures after printing patterns.

[0004] To achieve the above-mentioned objective, the present invention proposes the following technical solution:

[0005] The present invention provides a method for shaping PVC balls, comprising the following steps:

[0006] Step A: carry out a first ball body forming in a first mold from a PVC paste material using a rotational casting machine or a rotational molding machine to shape hollow PVC balls;

[0007] Step B: inflate the formed balls so that the outer diameter of the ball is equal to the diameter of an internal cavity of a second mold;

[0008] Step C: place the inflated balls into a second mold, then perform a second texture forming in the second mold on the inflated and formed balls using a rotational casting machine or a rotational molding machine, to shape textures on the surface of the formed PVC balls.

[0009] Furthermore, the first ball body forming comprises the following steps:

[0010] Step A1: Prepare the PVC material into a paste using stirring equipment suitable for the rotational casting process or the rotational molding process;

[0011] Step A2: Pour the prepared PVC paste material into the first mold;

[0012] Step A3: close the mold lid, lock it with bolts, then place the first mold in the oven cavity of the rotation casting machine or rotation molding machine, heat for a predetermined time S1 to plasticize and form, and stop heating at the end of the predetermined heating time, so that the PVC paste material is formed on the inner wall of the first mold via rotation casting or rotation molding;

[0013] Step A4: Remove the first mold from the rotary casting machine or rotary molding machine, then cool the first mold;

[0014] Step A5: open the first mold to obtain the hollow PVC balls.

[0015] In addition, the heating temperature for the first mold is 300 to 450 degrees and the predefined heating time SI is 5 to 12 minutes.

[0016] Furthermore, the first ball body forming comprises the following steps:

[0017] Step A1: before pouring the PVC paste material into the first mold, stick a predetermined patterned PVC film onto the internal surface of the first mold to complete a labeling.

[0018] In addition, the PVC paste material comprises 40% to 60% by mass of PVC resin, 40% to 60% by mass of plasticizer and 3% to 8% by mass of additives.

[0019] In addition, colour pigments could be added to the PVC pulp material.

[0020] Furthermore, the second texture forming process comprises the following steps:

[0021] Step Cl: Place the inflated hollow PVC balls with a smooth surface in the second mold with predetermined textures and close the lid of the mold;

[0022] Step C2: place the second mold in the oven cavity of the rotational casting machine or rotational molding machine and heat, which allows the air inside the PVC balls to expand under the action of the heating expansion, so that the PVC balls press against the inner wall of the second mold and the textures are formed on the surface of the PVC balls by plasticizing and forming under the action of heating, and stop heating at the end of the predefined heating time SI;

[0023] Step C3: Remove the second mold from the furnace cavity of the rotary casting machine or rotary molding machine and cool it;

[0024] Step C4: open the second mold to obtain the predefined textures, or to obtain the PVC balls with predetermined patterns and predetermined textures.

[0025] In addition, the heating temperature for the second mold is 250 to 400 degrees and the predefined heating time S2 is 5 to 10 minutes.

[0026] In addition, the first mold could be cooled by water or by air.

[0027] In addition, the second mold could be cooled by water or by air.

[0028] Compared with existing techniques, the present invention has the following effects: following nefices:

[0029] According to the PVC ball shaping process provided by the present invention, the formed PVC balls are inflated and placed back into a mold with predefined textures to be heated and reformed, so that the predefined textures are engraved on the surface of the balls, and furthermore, before the first molding, a PVC film with predetermined patterns is glued onto the mold, thus obtaining the PVC balls with predetermined patterns and predetermined textures. DESCRIPTIONS OF THE FIGURES

[0030] The embodiments of the present invention or existing technical solutions become clearer during the detailed description of the figures used in the embodiments and existing technical solutions. Notwithstanding, the figures below are given only by way of illustrative and non-limiting example, and other figures can be obtained by those skilled in the art without creative effort.

[0031] [Fig. 1] is a flowchart of a preferred embodiment of the PVC ball shaping process according to the present invention;

[0032] [Fig.2] a diagram of the first mold in the PVC ball forming process according to the present invention;

[0033] [Fig.3] a diagram of the second mold in the PVC ball forming process according to the present invention;

[0034] [Fig.4] shows a first PVC ball with textures and patterns produced according to the a method for shaping PVC balls according to the present invention; and

[0035] [Fig. 5] shows a second textured and patterned PVC ball produced according to the process for shaping PVC balls according to the present invention. DETAILED DESCRIPTION OF THE PROCESS OF IMPLEMENTATION

[0036] The object, the technical solution, and the advantages of the present invention will become clearer upon reading the following detailed description of the technical solution with reference to the figures. It should be noted that the embodiments described are illustrative only and not exhaustive. Other embodiments based on the embodiments of the present invention and obtained by persons skilled in the art without creative work should be included within the scope of protection of the present invention.

[0037] As shown in Figures 1 to 5, the present invention provides a method for shaping PVC balls, comprising the following steps:

[0038] Step A: first ball body forming, consisting of carrying out a first ball body forming in a first mold from a PVC paste material using a rotational casting machine or a rotational molding machine to shape hollow PVC balls;

[0039] In particular, the first ball body forming comprises the following steps:

[0040] Step A1: prepare, using stirring equipment, the PVC material in paste form suitable for the rotational casting process or the rotational molding process;

[0041] The PVC paste material comprises 40% to 60% by mass of PVC resin, 40% to 60% by mass of plasticizer and 3% to 8% by mass of additives; in addition, colour pigments could be added to the PVC paste material at a rate selected according to requirements.

[0042] It should be noted here that, to shape PVC balls with only textures, step A2 is carried out, and to shape PVC balls with predetermined patterns and predetermined textures, as shown in Figures 4 and 5, step A1 is carried out first and then step A2, step A1 comprising in particular the following steps:

[0043] Step A1: Before pouring the PVC paste material into the first mold, adhere a pre-patterned PVC film to the inner surface of the first mold to complete the labeling. This step allows pre-defined patterns to be formed on the surface of the PVC balls produced from the first molding.

[0044] Step A2: Pour the prepared PVC paste material into the first mold;

[0045] Step A3: close the mold lid, lock it with bolts, then place the first mold in the oven cavity of the rotation casting machine or rotation molding machine, heat for a predetermined time S1 to plasticize and form, and stop heating at the end of the predetermined heating time, so that the PVC paste material is formed on the inner wall of the first mold via rotation casting or rotation molding;

[0046] In particular, the heating temperature for the first mold is 300 to 450 degrees and the predefined heating time SI is 5 to 12 minutes. That is to say, the first mold is placed in the oven cavity of the rotary casting machine or rotary molding machine at 300 to 450 degrees for 5 to 12 minutes and is heated to plasticize and form;

[0047] Step A4: Remove the first mold from the rotary casting machine or rotary molding machine, then cool the first mold;

[0048] Furthermore, the first mold could be cooled by water or air. To improve efficiency and increase the cooling rate, water cooling is used in embodiments of the present invention to cool the first mold; that is, the first mold is removed from the furnace cavity of the rotary casting machine or rotary molding machine and cooled with water. Step A5 is then performed once cooling is complete.

[0049] Step A5: open the first mold to obtain the hollow PVC balls without patterns and with a smooth surface, or the hollow PVC balls with pre-printed patterns and a smooth surface.

[0050] Once the predetermined patterns have been created, the following steps will be executed To shape the predetermined textures on the surface of the PVC balls: first, inflate the PVC balls so that the internal cavity of the second mold is filled with the PVC balls, then heat the second mold, which allows the air inside the balls to expand and thus increase the pressure, so that the PVC balls press against the internal wall of the second mold, and the predetermined textures of the internal surface of the second mold are transferred onto the surface of the PVC balls by plasticizing and shaping the PVC balls, including in particular:

[0051] Step B: inflate the formed balls so that the outer diameter of the ball is equal to the diameter of an internal cavity of a second mold; in addition, fill with air, of course, seal a filling orifice and ensure that, when heated, the air inside the balls will not leak from the filling orifice, the sealing method and the sealing structure being carried out according to existing technologies.

[0052] Step C: place the inflated balls with a smooth surface into the second mold, then perform a second texture forming in the second mold on the inflated and formed balls using a rotational casting machine or a rotational molding machine, to shape the textures on the surface of the formed PVC balls.

[0053] Furthermore, the second texture forming process comprises the following steps:

[0054] Step Cl: Place the inflated hollow PVC balls with a smooth surface in the second mold with predetermined textures and close the lid of the mold; the predetermined textures of the second mold being prepared according to existing technologies.

[0055] Step C2: place the second mold in the oven cavity of the rotational casting machine or rotational molding machine and heat, which allows the air inside the PVC balls to expand under the action of the heating expansion, so that the PVC balls press against the inner wall of the second mold and the textures are formed on the surface of the PVC balls by plasticization and forming under the action of heating, and stop heating at the end of the predefined heating time SI;

[0056] In particular, the heating temperature for the second mold is 250 to 400 degrees and the predefined heating time S2 is 5 to 10 minutes. That is to say, the second mold is placed in the oven cavity of the rotary casting machine or rotary molding machine at 250 to 400 degrees for 5 to 10 minutes and is heated to plasticize and form, and step C3 is executed once the textures have formed;

[0057] Step C3: Remove the second mold from the furnace cavity of the rotary casting machine or rotary molding machine and cool it; the second mold could be cooled by water or air, to improve efficiency and increase The cooling rate, water cooling, is used in embodiments of the present invention to cool the second mold; that is, the second mold is removed from the furnace cavity of the rotary casting machine or rotary molding machine and cooled with water. Perform step C4 once cooling is complete.

[0058] Step C4: open the second mold to obtain the predefined textures, or to obtain the PVC balls with predetermined patterns and predetermined textures, as shown in [Fig.5], it should be noted here that the predetermined textures on the surface of the PVC balls of [Fig.4] are obtained using the predetermined textures of the second mold of [Fig.3].

[0059] According to the PVC ball shaping process provided by the present invention, the formed PVC balls are inflated and placed back into a mold with predefined textures to be heated and reformed, so that the predefined textures are engraved on the surface of the balls, and furthermore, before the first molding, a PVC film with predetermined patterns is glued onto the mold, thus obtaining the PVC balls with predetermined patterns and predetermined textures.

[0060] Example 1:

[0061] As shown in [Fig.1], first carry out labeling: stick a PVC film with predetermined patterns onto the first mold having a smooth internal surface; first carry out ball body forming: pour the paste material into the first mold to obtain PVC balls with predetermined patterns; finally carry out a second forming: inflate the PVC balls obtained by the first forming, place the PVC balls in the second mold with predetermined textures to obtain PVC balls with predetermined patterns and predetermined textures.

[0062] The embodiments below are merely illustrative of the present invention, but not limiting. Any modifications or replacements easily made by a person skilled in the art who is familiar with the technical field must be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention must be subject to the scope of protection claimed by the claims.

Claims

Demands

1. A method for shaping PVC balls, characterized in that it comprises the following steps: Step A: performing a first ball body forming in a first mold from a PVC paste material using a rotational casting machine or a rotational molding machine to shape hollow PVC balls; Step B: inflating the formed balls so that the outer diameter of the ball is equal to the diameter of an internal cavity of a second mold; Step C: placing the inflated balls in a second mold, then performing a second texture forming in the second mold on the inflated and formed balls using a rotational casting machine or a rotational molding machine, to shape textures on the surface of the formed PVC balls.

2. A method for shaping PVC balls according to claim 1, characterized in that the first ball body forming comprises the following steps: Step A1: prepare, using stirring equipment, the PVC paste material suitable for the rotational casting or rotational molding process; Step A2: pour the prepared PVC paste material into the first mold; Step A3: close the mold cover, lock it with bolts, then place the first mold in the oven cavity of the rotational casting machine or rotational molding machine, heat for a predetermined time SI to plasticize and form, and stop heating at the end of the predetermined heating time, so that the PVC paste material is formed on the inner wall of the first mold via rotational casting or rotational molding;Step A4: Remove the first mold from the rotary casting machine or rotary molding machine, then cool the first mold; Step A5: Open the first mold to obtain the hollow PVC balls.

3. A method for shaping PVC balls according to claim 2, characterized in that the heating temperature for the first mold is 300 to 450 degrees and the preset heating time SI is 5 to 12 minutes.

4. A method for shaping PVC balls according to claim 2, characterized in that the first ball body forming further comprises the following steps: Step A1 1: before pouring the PVC material into the first mold, sticking a predetermined patterned PVC film onto the internal surface of the first mold to complete a labeling.

5. A method for shaping PVC balls according to claim 1, characterized in that the PVC pulp material comprises 40% to 60% by mass of PVC resin, 40% to 60% by mass of plasticizer and 3% to 8% by mass of additives.

6. A method for shaping PVC balls according to claim 5, characterized in that coloring pigments are added to the PVC material in pulp.

7. A method for shaping PVC balls according to claim 1 or 2 or 4, characterized in that the second forming of the textures comprises the following steps: Step C1: place the inflated hollow PVC balls having a smooth surface in the second mold with predetermined textures and close the mold cover; Step C2: place the second mold in the oven cavity of the rotational casting machine or rotational molding machine and heat it, which allows the air inside the PVC balls to inflate under the action of the heating expansion, so that the PVC balls press against the inner wall of the second mold and the textures are formed on the surface of the PVC balls by plasticization and forming under the action of heating, and stop heating at the end of the predetermined heating time S1;Step C3: Remove the second mold from the oven cavity of the rotary casting machine or rotary molding machine and cool it; Step C4: Open the second mold to obtain the predefined textures, or to obtain the PVC balls with predetermined patterns and textures.

8. A method for shaping PVC balls according to claim 7, characterized in that the heating temperature for the second mold is 250 to 400 degrees and the predefined heating time S2 is 5 to 10 minutes.

9. A method for shaping PVC balls according to claim 2, characterized in that the first mold could be cooled by water or by air.

10. A method for shaping PVC balls according to claim 7, characterized in that the second mold could be cooled by water or by air.

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