CN114012952A - Manufacturing method of PVC ball with multilayer structure - Google Patents
Manufacturing method of PVC ball with multilayer structure Download PDFInfo
- Publication number
- CN114012952A CN114012952A CN202111161992.2A CN202111161992A CN114012952A CN 114012952 A CN114012952 A CN 114012952A CN 202111161992 A CN202111161992 A CN 202111161992A CN 114012952 A CN114012952 A CN 114012952A
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- mould
- slurry
- ball skin
- layer ball
- furnace body
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 239000002002 slurry Substances 0.000 claims abstract description 59
- 238000010438 heat treatment Methods 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 238000002347 injection Methods 0.000 claims abstract description 10
- 239000007924 injection Substances 0.000 claims abstract description 10
- 238000001175 rotational moulding Methods 0.000 claims description 15
- 239000012752 auxiliary agent Substances 0.000 claims description 14
- 238000004040 coloring Methods 0.000 claims description 14
- 239000000049 pigment Substances 0.000 claims description 14
- 239000004014 plasticizer Substances 0.000 claims description 14
- 239000011347 resin Substances 0.000 claims description 14
- 229920005989 resin Polymers 0.000 claims description 14
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 14
- 229920002554 vinyl polymer Polymers 0.000 claims description 14
- 238000007493 shaping process Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 238000004880 explosion Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 4
- 230000003670 easy-to-clean Effects 0.000 claims 2
- 239000010410 layer Substances 0.000 description 54
- 239000000463 material Substances 0.000 description 13
- 238000005187 foaming Methods 0.000 description 6
- 208000015943 Coeliac disease Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/22—Making multilayered or multicoloured articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
- B29C41/46—Heating or cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
- B29C41/52—Measuring, controlling or regulating
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08L27/06—Homopolymers or copolymers of vinyl chloride
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/54—Balls
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The invention discloses a method for manufacturing a PVC ball with a multilayer structure, which is characterized in that a secondary injection port is opened on a mould in the process of injecting outer layer ball skin liquid slurry into the mould for heating and forming for the first time through the structural design that secondary injection is arranged at the position of an inflating nozzle structure of the mould or any position of a ball body; the mould is taken out and direct inlayer ball skin liquid thick liquids are poured into at one shot forming in-process, carries out the post forming, lets outer ball skin and inlayer ball skin fuse integratively to realize the functional of double-deck PVC ball.
Description
Technical Field
The invention relates to the technical field of PVC balls, in particular to a manufacturing method of a PVC ball with a multilayer structure.
Background
PVC balls manufactured by slush molding and rotational molding processes in the current market are all of a single-layer structure, and the process for processing the PVC balls with a multi-layer structure is complex and has high cost, so that the problem of solving the same is particularly important.
Disclosure of Invention
Aiming at the problems, the invention provides a manufacturing method of a PVC ball with a multilayer structure, which is characterized in that a structural design of secondary material injection is arranged at an inflating nozzle structure of a mould or at any position of a ball body, a secondary material injection port designed on the mould is opened in the middle of the first time of injecting liquid slurry of an outer layer ball skin into the mould for heating and forming, the liquid slurry of an inner layer ball skin is injected into the mould again for secondary forming, and the outer layer ball skin and the inner layer ball skin are fused into a whole, so that the functionality of a double-layer PVC ball is realized.
In order to realize the technical scheme, the invention provides a method for manufacturing a PVC ball with a multilayer structure, which comprises the following steps:
the method comprises the following steps: preparing slurry of an outer layer ball skin which is soft and comfortable in touch feeling, wherein the formula of the slurry of the outer layer ball skin is as follows: 40-50% of PVC resin, 40-65% of plasticizer, 2-5% of auxiliary agent and coloring pigment;
step two: preparing inner layer ball skin slurry with high strength, explosion resistance and strong support property, wherein the formula of the inner layer ball skin slurry is as follows: 45-60 percent of PVC resin, 40-50 percent of plasticizer, 2-4 percent of auxiliary agent and coloring pigment;
step three: injecting the proportioned outer layer ball skin slurry into a vinyl or rotational molding mould and covering a mould locking screw, pushing the mould into a vinyl or rotational molding heating furnace body, heating and plasticizing in the furnace body for 2-8 minutes to form an outer layer ball skin with a smooth, attractive and easily cleaned surface, pulling the mould out of a slurry conveying gun for external use of the furnace body, injecting the inner layer ball skin slurry into the secondary feeding position of the mould again, covering and sealing the secondary feeding position, pushing the mould into the heating furnace body again, and heating for 5-10 minutes to plasticize and mold the slurry in the mould to form the inner layer ball skin with an explosion-proof function;
step four: and (3) pulling the mold out of the heating furnace body, putting the mold into water for cooling, then loosening the bolts to open the mold, taking out the ball body, and inflating and shaping.
The improvement is that the method comprises the following steps:
the method comprises the following steps: preparing slurry of an outer layer ball skin which is soft and comfortable in touch feeling, wherein the formula of the slurry of the outer layer ball skin is as follows: 45% of PVC resin, 50% of plasticizer, 3% of auxiliary agent and coloring pigment;
step two: preparing inner layer ball skin slurry with high strength, explosion resistance and strong support property, wherein the formula of the inner layer ball skin slurry is as follows: 45 percent of PVC resin, 45 percent of plasticizer, 3 percent of auxiliary agent and coloring pigment;
step three: injecting the proportioned outer layer ball skin slurry into a vinyl or rotational molding mould, covering a mould locking screw, pushing the mould into a vinyl or rotational molding heating furnace body, heating and plasticizing in the furnace body for 4 minutes to form an outer layer ball skin with a smooth, attractive and easily cleaned surface, pulling the mould out of the furnace body, opening the mould, injecting the liquid slurry of the inner layer ball skin into the mould, locking and closing the mould, pushing the mould into the heating furnace body again, heating for 7 minutes to plasticize and mold the slurry in the mould, and forming the inner layer ball skin with an explosion-proof function;
step four: and (3) pulling the mold out of the heating furnace body, putting the mold into water for cooling, then loosening the bolts to open the mold, taking out the ball body, and inflating and shaping.
The further improvement lies in that: the PVC ball has at least two layers.
The invention has the beneficial effects that:
1. with intensity height, the strong PVC formula material of support is as inlayer ball skin, and outer ball skin then uses the softness, the comfortable PVC formula material of sense of touch, structural design through the charging connector structure department at the mould or spheroid optional position is provided with the secondary and annotates the material, at the mould first outer ball skin liquid thick liquids pour into mould heating shaping open the secondary sprue mouth that designs on the mould midway, pour into the liquid thick liquids of inlayer ball skin into the mould secondary again in, let outer ball skin and inlayer ball skin fuse integratively, in order to realize the functionality of double-deck PVC ball, the spheroid surface still possesses the softness when having realized the spheroid and having possessed good holding power like this, comfortable excellent sense of touch.
2. The invention uses the foaming formula material with the explosion-proof function as the inner layer ball skin, the outer layer ball skin uses the material without foaming and smooth surface, the designed secondary injection port on the mould is opened midway when the liquid slurry of the outer layer ball skin is injected into the mould for heating and forming for the first time, or the mould is directly taken out in the one-time forming process to open the mould cover for directly carrying out secondary injection and forming, so that the outer layer ball skin and the inner layer ball skin are integrated, thus solving the defects that the prior ball with the smooth surface of the ball skin has no explosion-proof function and the ball with the explosion-proof function and the surface foam is very easy to dirty due to foaming.
Drawings
FIG. 1 is a block diagram of the present invention.
Detailed Description
In order to further understand the present invention, the following detailed description will be made with reference to the following examples, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
Example one
According to fig. 1, the present embodiment provides a method for manufacturing a PVC ball with a multilayer structure, including the following steps:
the method comprises the following steps: preparing slurry of an outer layer ball skin which is soft and comfortable in touch feeling, wherein the formula of the slurry of the outer layer ball skin is as follows: 45% of PVC resin, 50% of plasticizer, 3% of auxiliary agent and the balance of coloring pigment;
step two: preparing inner layer ball skin slurry with high strength, explosion resistance and strong support property, wherein the formula of the inner layer ball skin slurry is as follows: 45 percent of PVC resin, 45 percent of plasticizer and 3 percent of auxiliary agent, and the balance is coloring pigment;
step three: injecting the proportioned outer layer ball skin slurry into a vinyl or rotational molding mould and covering a mould locking screw, pushing the mould into a vinyl or rotational molding heating furnace body, heating and plasticizing in the furnace body for 4 minutes, pulling the mould out of the furnace body, injecting the inner layer ball skin slurry again from a secondary feeding position of the mould by using a slurry conveying gun for external use, tightly covering and sealing a secondary injection position, pushing the mould into the heating furnace body again, and heating for 7 minutes to plasticize and mold the slurry in the mould;
step four: and (3) pulling the mold out of the heating furnace body, putting the mold into water for cooling, then loosening the bolts to open the mold, taking out the ball body, and inflating and shaping.
The PVC ball is provided with a two-layer structure.
Example two
A manufacturing method of a PVC ball with a multilayer structure comprises the following steps:
the method comprises the following steps: preparing slurry of an outer layer ball skin which is soft and comfortable in touch feeling, wherein the formula of the slurry of the outer layer ball skin is as follows: 40% of PVC resin, 40% of plasticizer, 2% of auxiliary agent and the balance of coloring pigment;
step two: preparing inner layer ball skin slurry with high strength, explosion resistance and strong support property, wherein the formula of the inner layer ball skin slurry is as follows: 45 percent of PVC resin, 40 percent of plasticizer and 2 percent of auxiliary agent, and the balance is coloring pigment;
step three: injecting the proportioned outer layer ball skin slurry into a vinyl or rotational molding mould and covering a mould locking screw, pushing the mould into a vinyl or rotational molding heating furnace body, heating and plasticizing in the furnace body for 2 minutes, then pulling the mould out of the furnace body and injecting the inner layer ball skin slurry again from a secondary feeding position of the mould by using a slurry conveying gun for external use, then tightly covering and sealing a secondary injection position, pushing the mould into the heating furnace body again, and heating for 5 minutes to plasticize and mold the slurry in the mould;
step four: and (3) pulling the mold out of the heating furnace body, putting the mold into water for cooling, then loosening the bolts to open the mold, taking out the ball body, and inflating and shaping.
The PVC ball is provided with a two-layer structure.
EXAMPLE III
A manufacturing method of a PVC ball with a multilayer structure comprises the following steps:
the method comprises the following steps: preparing slurry of an outer layer ball skin which is soft and comfortable in touch feeling, wherein the formula of the slurry of the outer layer ball skin is as follows: 50% of PVC resin, 65% of plasticizer, 5% of auxiliary agent and the balance of coloring pigment;
step two: preparing inner layer ball skin slurry with high strength, explosion resistance and strong support property, wherein the formula of the inner layer ball skin slurry is as follows: 60 percent of PVC resin, 50 percent of plasticizer and 4 percent of auxiliary agent, and the balance is coloring pigment;
step three: injecting the proportioned outer layer ball skin slurry into a vinyl or rotational molding mould, covering a mould locking screw, pushing the mould into a vinyl or rotational molding heating furnace body, heating and plasticizing in the furnace body for 8 minutes, pulling the mould out of the furnace body, opening the mould, injecting the inner layer ball skin liquid slurry into the mould, locking and closing the mould, pushing the mould into the heating furnace body again, and heating for 10 minutes to plasticize and mold the slurry in the mould;
step four: and (3) pulling the mold out of the heating furnace body, putting the mold into water for cooling, then loosening the bolts to open the mold, taking out the ball body, and inflating and shaping.
With intensity height, the strong PVC formula material of support is as inlayer ball skin, and outer ball skin then uses the softness, the comfortable PVC formula material of sense of touch, structural design through the charging connector structure department at the mould or spheroid optional position is provided with the secondary and annotates the material or directly takes out the mould in one shot forming process and open the mould lid and directly carry out the secondary and annotate the material, secondary forming in the liquid thick liquids reinjection mould of inlayer ball skin, let outer ball skin and inlayer ball skin fuse integratively, in order to realize the functional of double-deck PVC ball, the spheroid surface still possesses the softness when having realized that the spheroid possesses good holding power like this, comfortable superexcellent sense of touch.
The invention uses the foaming formula material with the explosion-proof function as the inner layer ball skin, the outer layer ball skin uses the material without foaming and smooth surface, the designed secondary injection port is opened midway when the liquid slurry of the outer layer ball skin is injected into the mould for the first time of the mould for heating and forming, the liquid slurry of the inner layer ball skin is injected into the mould again for secondary forming, and the outer layer ball skin and the inner layer ball skin are integrated, thus solving the problem that the prior ball with the smooth surface of the ball skin has no explosion-proof function and the surface bubble is very easy to be dirty due to foaming.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. A manufacturing method of a PVC ball with a multilayer structure is characterized by comprising the following steps:
the method comprises the following steps: preparing slurry of an outer layer ball skin which is soft and comfortable in touch feeling, wherein the formula of the slurry of the outer layer ball skin is as follows: 40-50% of PVC resin, 40-65% of plasticizer, 2-5% of auxiliary agent and coloring pigment;
step two: preparing inner layer ball skin slurry with high strength, explosion resistance and strong support property, wherein the formula of the inner layer ball skin slurry is as follows: 45-60 percent of PVC resin, 40-50 percent of plasticizer, 2-4 percent of auxiliary agent and coloring pigment;
step three: injecting the proportioned outer layer ball skin slurry into a vinyl or rotational molding mould and covering a mould locking screw, pushing the mould into a vinyl or rotational molding heating furnace body, heating and plasticizing in the furnace body for 2-8 minutes to form an outer layer ball skin with a smooth, attractive and easy-to-clean surface, pulling the mould out of a furnace body external slurry conveying gun, injecting inner layer ball skin slurry again from a designed secondary feeding position on the mould, tightly covering and sealing a secondary injection position, pushing the mould into the heating furnace body again, heating for 5-10 minutes to plasticize and mold the slurry in the mould to form an inner layer ball skin with an explosion-proof function, and fusing the outer layer ball skin and the inner layer ball skin into a whole;
step four: and (3) pulling the mold out of the heating furnace body, putting the mold into water for cooling, then loosening the bolts to open the mold, taking out the ball body, and inflating and shaping.
2. The method for manufacturing a PVC ball with a multilayer structure according to claim 1, characterized by comprising the following steps:
the method comprises the following steps: preparing slurry of an outer layer ball skin which is soft and comfortable in touch feeling, wherein the formula of the slurry of the outer layer ball skin is as follows: 45% of PVC resin, 50% of plasticizer, 3% of auxiliary agent and coloring pigment;
step two: preparing inner layer ball skin slurry with high strength, explosion resistance and strong support property, wherein the formula of the inner layer ball skin slurry is as follows: 45 percent of PVC resin, 45 percent of plasticizer, 3 percent of auxiliary agent and coloring pigment;
step three: injecting the proportioned outer layer ball skin slurry into a vinyl or rotational molding mould and covering a mould locking screw, pushing the mould into a vinyl or rotational molding heating furnace body, heating and plasticizing for 4 minutes in the furnace body to form an outer layer ball skin with a smooth, attractive and easy-to-clean surface, pulling the mould out of the furnace body, opening the mould, injecting the liquid slurry of the inner layer ball skin into the mould, locking and closing the mould, pushing the mould into the heating furnace body again, heating for 7 minutes to plasticize and mold the slurry in the mould to form an inner layer ball skin with an explosion-proof function, and fusing the outer layer ball skin and the inner layer ball skin into a whole;
step four: and (3) pulling the mold out of the heating furnace body, putting the mold into water for cooling, then loosening the bolts to open the mold, taking out the ball body, and inflating and shaping.
3. A method for manufacturing PVC ball of multilayer structure according to claim 1 or 2, characterized in that: the PVC ball has at least two layers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111161992.2A CN114012952A (en) | 2021-09-30 | 2021-09-30 | Manufacturing method of PVC ball with multilayer structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111161992.2A CN114012952A (en) | 2021-09-30 | 2021-09-30 | Manufacturing method of PVC ball with multilayer structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114012952A true CN114012952A (en) | 2022-02-08 |
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ID=80055468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111161992.2A Pending CN114012952A (en) | 2021-09-30 | 2021-09-30 | Manufacturing method of PVC ball with multilayer structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114012952A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1521121A (en) * | 1976-05-28 | 1978-08-16 | Mettoy Co Ltd | Closed hollow articles |
| EP0365488A1 (en) * | 1988-10-19 | 1990-04-25 | TALE S.r.l. | Process for producing hollow elastic bodies, in particular balls and similar objects, and the balls so produced |
| CN101028738A (en) * | 2007-04-04 | 2007-09-05 | 刘芷彤 | Production of laminated plastic toy |
| CN110640953A (en) * | 2019-09-30 | 2020-01-03 | 滁州恒佳体育用品有限公司 | Manufacturing method of PVC ball with multilayer structure |
-
2021
- 2021-09-30 CN CN202111161992.2A patent/CN114012952A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1521121A (en) * | 1976-05-28 | 1978-08-16 | Mettoy Co Ltd | Closed hollow articles |
| EP0365488A1 (en) * | 1988-10-19 | 1990-04-25 | TALE S.r.l. | Process for producing hollow elastic bodies, in particular balls and similar objects, and the balls so produced |
| CN101028738A (en) * | 2007-04-04 | 2007-09-05 | 刘芷彤 | Production of laminated plastic toy |
| CN110640953A (en) * | 2019-09-30 | 2020-01-03 | 滁州恒佳体育用品有限公司 | Manufacturing method of PVC ball with multilayer structure |
| US20210093930A1 (en) * | 2019-09-30 | 2021-04-01 | Chu Zhou Heng jia Sports Products Limited | PVC Ball with Multi-Layer Structure and Device for Manufacturing PVC Ball |
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Application publication date: 20220208 |