CN111320776A - Multi-layer temperature-variable or light-variable science popularization intelligence toy or handicraft and production process thereof - Google Patents
Multi-layer temperature-variable or light-variable science popularization intelligence toy or handicraft and production process thereof Download PDFInfo
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- CN111320776A CN111320776A CN201811537459.XA CN201811537459A CN111320776A CN 111320776 A CN111320776 A CN 111320776A CN 201811537459 A CN201811537459 A CN 201811537459A CN 111320776 A CN111320776 A CN 111320776A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/0023—Digital printing methods characterised by the inks used
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/0082—Digital printing on bodies of particular shapes
- B41M5/0088—Digital printing on bodies of particular shapes by ink-jet printing
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2309/00—Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/16—Halogen-containing compounds
- C08K2003/168—Zinc halides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The invention discloses a multi-layer temperature-variable or light-variable science popularization intelligence toy or handicraft and a production process thereof. Compared with the conventional pinball toy for children, the pinball toy is internally provided with the animal and plant model, the external part is provided with the transparent model, the temperature-sensitive or photosensitive color-changing coating is printed on the surface of the transparent model, the temperature-sensitive or photosensitive color-changing coating is the growth condition of animals and plants in different time periods, the temperature or ultraviolet change is sensed, the coating gradually becomes transparent, the model patterns of different layers can be gradually observed from the external part, the appearances of the animals and the plants in different stages can be visually observed, the enjoyment of the toy is increased, and the perception and cognition capability of the children is improved.
Description
Technical Field
The invention belongs to the field of toy and handicraft manufacturing, and particularly relates to a multi-layer temperature-variable or light-variable popular science intelligence toy or handicraft. Meanwhile, the invention also relates to a production process of the multi-layer temperature-variable or light-variable popular science intelligence toy or handicraft.
Background
The most important stage in the cognitive level of the growth of the children is a perception stage, and the learning of the children by the aid of pictures can make the children more clever, help the children master some knowledge and greatly improve the autonomous observation capability of the children, however, the existing children toys are basically in certain shapes and have no variability, and the children are easy to dislike after long-time use and are not beneficial to training of the perception capability of the children, so that the children intelligence-benefiting toy with the variable patterns is provided by the invention.
Disclosure of Invention
The invention aims to provide a multi-layer temperature-variable or light-variable science popularization intelligence toy or handicraft and a production process thereof, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a multi-layer temperature-variable or light-variable popular science intelligence toy or handicraft comprises an elastic sphere, wherein the elastic sphere comprises a plurality of layers of transparent models, the transparent models are sequentially wrapped from inside to outside, a temperature-variable coating or a light-variable coating is arranged on the surface of each layer of transparent model, and an animal model or a plant model is arranged on the innermost side of each layer of transparent model.
Preferably, the temperature-change coating or the light-change coating is a spray-printed animal and plant pattern.
A production process of a multi-layer temperature-variable or light-variable popular science intelligence toy or handicraft comprises the following steps:
s1, taking 30-40 parts of polydiene rubber, 20-36 parts of butadiene rubber, 3-5 parts of active zinc chloride, 1-2 parts of rubber accelerator, 10-20 parts of chloroprene rubber, 1-2 parts of stearic acid, 1-2 parts of anti-aging agent, 10-20 parts of white carbon black, 12-16 parts of naphthenic oil, 1-3 parts of sulfur and 2-4 parts of glycerol according to parts by weight;
s2, adding the polydiene rubber, the butadiene rubber and the chloroprene rubber into an internal mixer, and internally mixing for 10-15 minutes;
s3, adding active zinc chloride, rubber accelerator, stearic acid, anti-aging agent, white carbon black, glycerol and naphthenic oil, mixing at the motor speed of 80-100 r/min for 20-30 min;
s4, adding sulfur for vulcanization, wherein the machine temperature does not exceed 65 ℃ during the vulcanization, the vulcanization temperature is 145-160 ℃, and the vulcanization time is 250-300S, so as to obtain the transparent rubber;
s5, adding an animal and plant model into the spherical mold after vulcanization, adding transparent rubber obtained after vulcanization into the spherical mold, placing the animal and plant model in the center of the mold, making the animal and plant model by injection molding, and wrapping the animal and plant model with the transparent rubber to make a transparent model;
s6, cooling the die, taking out the transparent model, fixing the transparent model on a station of a spraying printer, adding the thermochromic raw material into the printer, starting the printer, and printing out a pattern corresponding to the animal and plant model;
s7, after the pattern is printed, drying the pattern, putting the printed ball body into another transparent model mold, fixing the transparent model at the center of the transparent model mold, and adding the transparent rubber prepared in the S4 into the ball-shaped mold to prepare another layer of transparent model;
s8, repeating S6 and S7 to obtain 3-5 layers of transparent models, and printing different growth stages on the surface of each layer of transparent cladding.
Preferably, the anti-aging agent comprises an anti-aging agent SP and an anti-aging agent MB, and the ratio of the anti-aging agent SP to the anti-aging agent MB is 1: 1.
preferably, the color-changing temperature of the thermochromic raw material is-15-70 ℃, and when the temperature is reduced to 5-15 ℃ or increased to 25-70 ℃, the thermochromic raw material gradually becomes colorless.
Preferably, the thermochromic raw material contains microcapsule color-changing particles with the particle size of 1-10 um.
Compared with the prior art, the invention has the beneficial effects that: compared with the conventional pinball toy for children, the pinball toy is internally provided with the animal and plant model, the external part is provided with the transparent model, the temperature-sensitive or photosensitive color-changing coating is printed on the surface of the transparent model, the temperature-sensitive or photosensitive color-changing coating is the growth condition of animals and plants in different time periods, the temperature or ultraviolet change is sensed, the coating gradually becomes transparent, the model patterns of different layers can be gradually observed from the external part, the appearances of the animals and the plants in different stages can be visually observed, the enjoyment of the toy is increased, and the perception and cognition capability of the children is improved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: 1 elastic sphere, 2 animal and plant models and 3 transparent models.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A multi-layer temperature-variable or light-variable popular science intelligence toy or handicraft comprises an elastic ball body 1, wherein the elastic ball body 1 comprises a plurality of layers of transparent models 3, the transparent models 3 are sequentially wrapped from inside to outside, a temperature-variable coating or a light-variable coating is arranged on the surface of each layer of transparent model 3, and an animal model 2 is arranged on the inner side of each layer of transparent model 3.
Specifically, the temperature change coating or the light change coating is a sprayed and printed animal and plant pattern.
The invention also provides a production process of the multi-layer temperature-variable or light-variable science popularization intelligence toy or handicraft, which comprises the following steps:
s1, taking 30-40 parts of polydiene rubber, 20-36 parts of butadiene rubber, 3-5 parts of active zinc chloride, 1-2 parts of rubber accelerator, 10-20 parts of chloroprene rubber, 1-2 parts of stearic acid, 1-2 parts of anti-aging agent, 10-20 parts of white carbon black, 12-16 parts of naphthenic oil, 1-3 parts of sulfur and 2-4 parts of glycerol according to parts by weight;
s2, adding the polydiene rubber, the butadiene rubber and the chloroprene rubber into an internal mixer, and internally mixing for 10-15 minutes;
s3, adding active zinc chloride, rubber accelerator, stearic acid, anti-aging agent, white carbon black, glycerol and naphthenic oil, mixing at the motor speed of 80-100 r/min for 20-30 min;
s4, adding sulfur for vulcanization, wherein the machine temperature does not exceed 65 ℃ during the vulcanization, the vulcanization temperature is 145-160 ℃, and the vulcanization time is 250-300S, so as to obtain the transparent rubber;
s5, adding an animal and plant model into the spherical mold after vulcanization, adding transparent rubber obtained after vulcanization into the spherical mold, placing the animal and plant model in the center of the mold, making the animal and plant model by injection molding, and wrapping the animal and plant model with the transparent rubber to make a transparent model;
s6, cooling the die, taking out the transparent model, fixing the transparent model on a station of a spraying printer, adding the thermochromic raw material into the printer, starting the printer, and printing out a pattern corresponding to the animal and plant model;
s7, after the pattern is printed, drying the pattern, putting the printed ball body into another transparent model mold, fixing the transparent model at the center of the transparent model mold, and adding the transparent rubber prepared in the S4 into the ball-shaped mold to prepare another layer of transparent model;
s8, repeating S6 and S7 to obtain 3-5 layers of transparent models, and printing different growth stages on the surface of each layer of transparent cladding.
Specifically, the color-changing temperature of the thermochromic raw material is-15-70 ℃, and when the temperature is reduced to 5-15 ℃ or increased to 25-70 ℃, the thermochromic raw material gradually becomes colorless.
Example 2
A multi-layer temperature-variable or light-variable popular science intelligence toy or handicraft comprises an elastic ball body 1, wherein the elastic ball body 1 comprises a plurality of layers of transparent models 3, the transparent models 3 are sequentially wrapped from inside to outside, a temperature-variable coating or a light-variable coating is arranged on the surface of each layer of transparent model 3, and an animal model 2 is arranged on the inner side of each layer of transparent model 3.
Specifically, the temperature change coating or the light change coating is a sprayed and printed animal and plant pattern.
The invention also provides a production process of the multi-layer temperature-variable or light-variable science popularization intelligence toy or handicraft, which comprises the following steps:
s1, taking 30-40 parts of polydiene rubber, 20-36 parts of butadiene rubber, 3-5 parts of active zinc chloride, 1-2 parts of rubber accelerator, 10-20 parts of chloroprene rubber, 1-2 parts of stearic acid, 1-2 parts of anti-aging agent, 10-20 parts of white carbon black, 12-16 parts of naphthenic oil, 1-3 parts of sulfur and 2-4 parts of glycerol according to parts by weight;
s2, adding the polydiene rubber, the butadiene rubber and the chloroprene rubber into an internal mixer, and internally mixing for 10-15 minutes;
s3, adding active zinc chloride, rubber accelerator, stearic acid, anti-aging agent, white carbon black, glycerol and naphthenic oil, mixing at the motor speed of 80-100 r/min for 20-30 min;
s4, adding sulfur for vulcanization, wherein the machine temperature does not exceed 65 ℃ during the vulcanization, the vulcanization temperature is 145-160 ℃, and the vulcanization time is 250-300S, so as to obtain the transparent rubber;
s5, adding an animal and plant model into the spherical mold after vulcanization, adding transparent rubber obtained after vulcanization into the spherical mold, placing the animal and plant model in the center of the mold, making the animal and plant model by injection molding, and wrapping the animal and plant model with the transparent rubber to make a transparent model;
s6, cooling the die, taking out the transparent model, fixing the transparent model on a station of a spraying printer, adding the thermochromic raw material into the printer, starting the printer, and printing out a pattern corresponding to the animal and plant model;
s7, after the pattern is printed, drying the pattern, putting the printed ball body into another transparent model mold, fixing the transparent model at the center of the transparent model mold, and adding the transparent rubber prepared in the S4 into the ball-shaped mold to prepare another layer of transparent model;
s8, repeating S6 and S7 to obtain 3-5 layers of transparent models, and printing different growth stages on the surface of each layer of transparent cladding.
Specifically, the color-changing temperature of the thermochromic raw material is-15-70 ℃, and when the temperature is reduced to 5-15 ℃ or increased to 25-70 ℃, the thermochromic raw material gradually becomes colorless.
Example 3
A multi-layer temperature-variable or light-variable popular science intelligence toy or handicraft comprises an elastic ball body 1, wherein the elastic ball body 1 comprises a plurality of layers of transparent models 3, the transparent models 3 are sequentially wrapped from inside to outside, a temperature-variable coating or a light-variable coating is arranged on the surface of each layer of transparent model 3, and an animal model 2 is arranged on the inner side of each layer of transparent model 3.
Specifically, the temperature change coating or the light change coating is a sprayed and printed animal and plant pattern.
The invention also provides a production process of the multi-layer temperature-variable or light-variable science popularization intelligence toy or handicraft, which comprises the following steps:
s1, taking 30-40 parts of polydiene rubber, 20-36 parts of butadiene rubber, 3-5 parts of active zinc chloride, 1-2 parts of rubber accelerator, 10-20 parts of chloroprene rubber, 1-2 parts of stearic acid, 1-2 parts of anti-aging agent, 10-20 parts of white carbon black, 12-16 parts of naphthenic oil, 1-3 parts of sulfur and 2-4 parts of glycerol according to parts by weight;
s2, adding the polydiene rubber, the butadiene rubber and the chloroprene rubber into an internal mixer, and internally mixing for 10-15 minutes;
s3, adding active zinc chloride, rubber accelerator, stearic acid, anti-aging agent, white carbon black, glycerol and naphthenic oil, mixing at the motor speed of 80-100 r/min for 20-30 min;
s4, adding sulfur for vulcanization, wherein the machine temperature does not exceed 65 ℃ during the vulcanization, the vulcanization temperature is 145-160 ℃, and the vulcanization time is 250-300S, so as to obtain the transparent rubber;
s5, adding an animal and plant model into the spherical mold after vulcanization, adding transparent rubber obtained after vulcanization into the spherical mold, placing the animal and plant model in the center of the mold, making the animal and plant model by injection molding, and wrapping the animal and plant model with the transparent rubber to make a transparent model;
s6, cooling the die, taking out the transparent model, fixing the transparent model on a station of a spraying printer, adding the thermochromic raw material into the printer, starting the printer, and printing out a pattern corresponding to the animal and plant model;
s7, after the pattern is printed, drying the pattern, putting the printed ball body into another transparent model mold, fixing the transparent model at the center of the transparent model mold, and adding the transparent rubber prepared in the S4 into the ball-shaped mold to prepare another layer of transparent model;
s8, repeating S6 and S7 to obtain 3-5 layers of transparent models, and printing different growth stages on the surface of each layer of transparent cladding.
Specifically, the color-changing temperature of the thermochromic raw material is-15-70 ℃, and when the temperature is reduced to 5-15 ℃ or increased to 25-70 ℃, the thermochromic raw material gradually becomes colorless.
Compared with the conventional pinball toy for children, the pinball toy is internally provided with the animal and plant model, the external part is provided with the transparent model, the temperature-sensitive or photosensitive color-changing coating is printed on the surface of the transparent model, the temperature-sensitive or photosensitive color-changing coating is the growth condition of animals and plants in different time periods, the temperature or ultraviolet change is sensed, the coating gradually becomes transparent, the model patterns of different layers can be gradually observed from the external part, the appearances of the animals and the plants in different stages can be visually observed, the enjoyment of the toy is increased, and the perception and cognition capability of the children is improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. A multi-layer temperature-variable or light-variable science popularization intelligence toy or handicraft comprises an elastic ball body (1), and is characterized in that: the elastic ball body (1) comprises a plurality of layers of transparent models (3), the transparent models (3) are sequentially wrapped from inside to outside, a temperature-changing coating or a light-changing coating is arranged on the surface of each layer of transparent model (3), and an animal model (2) is arranged on the innermost side of each layer of transparent model (3).
2. The multi-layer temperature-or light-variable science popularization intelligence toy or handicraft of claim 1, wherein: the temperature change coating or the light change coating is a sprayed and printed animal and plant pattern.
3. A process for producing a multi-layered temperature-or light-variable science popularization intelligence toy or handicraft according to claim 1, comprising the steps of:
s1, taking 30-40 parts of polydiene rubber, 20-36 parts of butadiene rubber, 3-5 parts of active zinc chloride, 1-2 parts of rubber accelerator, 10-20 parts of chloroprene rubber, 1-2 parts of stearic acid, 1-2 parts of anti-aging agent, 10-20 parts of white carbon black, 12-16 parts of naphthenic oil, 1-3 parts of sulfur and 2-4 parts of glycerol according to parts by weight;
s2, adding the polydiene rubber, the butadiene rubber and the chloroprene rubber into an internal mixer, and internally mixing for 10-15 minutes;
s3, adding active zinc chloride, rubber accelerator, stearic acid, anti-aging agent, white carbon black, glycerol and naphthenic oil, mixing at the motor speed of 80-100 r/min for 20-30 min;
s4, adding sulfur for vulcanization, wherein the machine temperature does not exceed 65 ℃ during the vulcanization, the vulcanization temperature is 145-160 ℃, and the vulcanization time is 250-300S, so as to obtain the transparent rubber;
s5, adding an animal and plant model into the spherical mold after vulcanization, adding transparent rubber obtained after vulcanization into the spherical mold, placing the animal and plant model in the center of the mold, making the animal and plant model by injection molding, and wrapping the animal and plant model with the transparent rubber to make a transparent model;
s6, cooling the die, taking out the transparent model, fixing the transparent model on a station of a spraying printer, adding the thermochromic raw material into the printer, starting the printer, and printing out a pattern corresponding to the animal and plant model;
s7, after the pattern is printed, drying the pattern, putting the printed ball body into another transparent model mold, fixing the transparent model at the center of the transparent model mold, and adding the transparent rubber prepared in the S4 into the ball-shaped mold to prepare another layer of transparent model;
s8, repeating S6 and S7 to obtain 3-5 layers of transparent models, and printing different growth stages on the surface of each layer of transparent cladding.
4. The process for producing a multi-layer temperature-or light-variable science popularization intelligence toy or handicraft according to claim 1, wherein: the anti-aging agent comprises an anti-aging agent SP and an anti-aging agent MB, and the proportion of the anti-aging agent SP to the anti-aging agent MB is 1: 1.
5. the process for producing a multi-layer temperature-or light-variable science popularization intelligence toy or handicraft according to claim 3, wherein: the color-changing temperature of the temperature-sensitive color-changing raw material is-15-70 ℃, and when the temperature is reduced to 5-15 ℃ or increased to 25-70 ℃, the color gradually changes into colorless.
6. The process for producing a multi-layer temperature-or light-variable science popularization intelligence toy or handicraft according to claim 3, wherein: the temperature sensing color changing or light sensing raw material contains microcapsule color changing particles with the particle size of 1-10 um.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811537459.XA CN111320776A (en) | 2018-12-15 | 2018-12-15 | Multi-layer temperature-variable or light-variable science popularization intelligence toy or handicraft and production process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811537459.XA CN111320776A (en) | 2018-12-15 | 2018-12-15 | Multi-layer temperature-variable or light-variable science popularization intelligence toy or handicraft and production process thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04235083A (en) * | 1991-01-10 | 1992-08-24 | Toray Ind Inc | Photosensitive resin original plate for rubber stamp |
| CN101353476A (en) * | 2007-07-25 | 2009-01-28 | Ems专利股份公司 | Photochrome moulding material and objects made therefrom |
| CN101522273A (en) * | 2005-08-24 | 2009-09-02 | 舒特德穆恩产品Ⅱ有限责任公司 | Photo-chromic toys, photo-chromic light drawing sets, photo-chromic playsets, hand held activating light sources, and activation light projectors |
| CN104002415A (en) * | 2014-05-31 | 2014-08-27 | 奉化市骏兴玩具有限公司 | Production process of temperature-variable toy and production method of material for producing toy |
| CN104017298A (en) * | 2014-05-31 | 2014-09-03 | 奉化市骏兴玩具有限公司 | Temperature varying toy production technology and production method of material for toy production |
-
2018
- 2018-12-15 CN CN201811537459.XA patent/CN111320776A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04235083A (en) * | 1991-01-10 | 1992-08-24 | Toray Ind Inc | Photosensitive resin original plate for rubber stamp |
| CN101522273A (en) * | 2005-08-24 | 2009-09-02 | 舒特德穆恩产品Ⅱ有限责任公司 | Photo-chromic toys, photo-chromic light drawing sets, photo-chromic playsets, hand held activating light sources, and activation light projectors |
| CN101353476A (en) * | 2007-07-25 | 2009-01-28 | Ems专利股份公司 | Photochrome moulding material and objects made therefrom |
| CN104002415A (en) * | 2014-05-31 | 2014-08-27 | 奉化市骏兴玩具有限公司 | Production process of temperature-variable toy and production method of material for producing toy |
| CN104017298A (en) * | 2014-05-31 | 2014-09-03 | 奉化市骏兴玩具有限公司 | Temperature varying toy production technology and production method of material for toy production |
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Application publication date: 20200623 |