CN109968866A - A kind of high intensity pen tip drawing wax crayon - Google Patents
A kind of high intensity pen tip drawing wax crayon Download PDFInfo
- Publication number
- CN109968866A CN109968866A CN201910291282.8A CN201910291282A CN109968866A CN 109968866 A CN109968866 A CN 109968866A CN 201910291282 A CN201910291282 A CN 201910291282A CN 109968866 A CN109968866 A CN 109968866A
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- CN
- China
- Prior art keywords
- parts
- pen tip
- crayon
- mixing
- penholder
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K19/00—Non-propelling pencils; Styles; Crayons; Chalks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K29/00—Combinations of writing implements with other articles
- B43K29/20—Combinations of writing implements with other articles with other articles having storage compartments
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D13/00—Pencil-leads; Crayon compositions; Chalk compositions
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
Abstract
The present invention relates to a kind of high pen tip intensity drawing wax crayons, including penholder, the pen tip ontology being threadedly coupled with penholder and it is threaded in penholder ontology and the intrinsic crayon core of pen tip, crayon core is with paraffin, the solid drawing product that composite solid state is oily, extender pigment and pigment are as the main component, it is fabricated using the raw material for meeting the U.S. and European safety benchmark, the product being integrated with wax crayon, packaging material.It is suitble to drawing, teaching suitable for the description of various paper materials with the original characteristic of common wax crayon.Simple and elegant beautiful with color, smearing is smooth, shows money or valuables one carries unintentionally uniformly, and pen tip is continuous, product not easily broken feature in use, solve common wax crayon break end in use, disconnected pen the phenomenon that, it is the feeling that improves the comfort of drawing and use, safe to the human body, can be safe to use.
Description
Technical field
The present invention relates to stationeries, specifically design a kind of high pen tip intensity drawing wax crayon.
Background technique
People are a large amount of to be painted, imparted knowledge to students using drawing wax crayon in daily life, study.Wax crayon in the prior art,
Only play the role of gripping and provide observation angle to observe font, such pen tip acts on single.When in people's long-time
After gripping is write, hand can feel fatigue and fever, and existing pen tip cannot achieve the effect of releiving to the hand of people；And
And the hand strength of people is different, requires the pen tip gravity of different pens also not identical, the hand of gravity at pen tip closer to people
Strength, more writing convenient for people's word；And the gravity at pen tip, the pen tip of the prior art just cannot achieve adjusting when factory,
Therefore, the people of different hand strengths cannot achieve the adjusting of the gravity to same pen tip；Common drawing wax crayon is in use
Easily there is " disconnected pen " phenomenon, for especially nib when carrying out tiny position description creation, the damaged fracture of nib destroys wound of painting
Make effect, making painting effect, all that has been achieved is spoiled, destroys the feeling of user of service's creation.
Summary of the invention
The object of the present invention is to provide a kind of high pen tip intensity drawing wax crayons.
In order to solve the above-mentioned technical problems, the present invention provides a kind of high pen tip intensity drawing wax crayons, including penholder, with institute
The pen tip ontology for stating penholder threaded connection, is threaded in penholder ontology and the intrinsic crayon core of pen tip,
Water storing bin is fixed in penholder ontology upper end；
Annular storage chamber is opened up from end face thereon on the pen tip ontology；
The penholder includes inner barrel and outer barrel, and the upper surface of the outer cylinder offers screw thread annular groove, and the inner cylinder inner sleeve exists
It in the outer cylinder and is spaced to form string sink, the outer wall of the inner cylinder is fixedly connected with the inner wall of the outer cylinder by connecting rod；
The water storing bin includes rubber plug head and is fixed on thread barrel under the rubber plug head, the lower end mask of the rubber plug head
There are several water droppers, several water droppers are distributed in a ring；
Described water dropper protrudes into the string sink, and the thread barrel is threaded in the screw thread annular groove, the string water
The lower end of slot is interconnected with the annular storage chamber.
Preferably, the pen tip ontology includes the conus portion being wholely set and cylindrical portion, the side wall one of the cylindrical portion
Body is provided with ring-shaped rubber, and the inner sidewall of the ring-shaped rubber connects with the inner wall of the annular storage chamber.
Preferably, the outer wall of the ring-shaped rubber is in ellipsoid.
Preferably, being provided with interior rubber ring and outer rubber circle, institute on the binding face of the pen tip ontology and the penholder
State the inner ring that interior rubber ring is located at the annular storage chamber；The outer rubber circle is located at the outer ring of the annular storage chamber.
Preferably, the surface of the ring-shaped rubber has several massage convexes.
Preferably, the crayon core includes following mass parts: 20.0~30.0 parts of paraffin, 2.0~5.0 parts of microwax,
It is 1.0~3.0 parts of polyethylene wax, 1.0~5.0 parts of vaseline, 15.0~25.0 parts of fixed oil, 2.0~15.0 parts of stearic acid, hard
1.0~5.0 parts of resin acid monoglyceride, 2.0~5.0 parts of palmitic acid, 1.0~3.0 parts of lauric acid, 3.0~10.0 parts of calcium carbonate,
20.0~30.0 parts of talcum powder, 7.0~12.0 parts of kaolin, 5.0~15.0 parts of barium sulfate, 0.5~5.0 part of dispersing agent, emulsification
1.0~3.0 parts of agent, 0.5~3.0 part of coupling agent, 0.5~2.0 part of pigment.
Preferably, the crayon core the preparation method comprises the following steps:
(1) to changing in paraffin pan, 20.0~30.0 parts of paraffin, 2.0~5.0 parts of microwax, polyethylene wax 1.0~3.0 is added
Part, 1.0~5.0 parts of vaseline, 15.0~25.0 parts of fixed oil, 2.0~15.0 parts of stearic acid, glyceryl monostearate 1.0~
5.0 parts, 2.0~5.0 parts of palmitic acid, 1.0~3.0 parts of lauric acid, heat material after charging, until melt completely,
Obtain the first mixing；
(2) blender is opened, 75-80 DEG C of high-speed stirred of constant temperature is added 1.0~3.0 parts of emulsifier while stirring, continues
Stirring is until first mixing is emulsified completely as uniform liquid, the second mixing of acquisition；
(3) the second mixing of part is taken out from describedization paraffin pan in container, is added 0.5~2.0 part of pigment, ground and mixed
Uniformly, and constant temperature is between 75-80 DEG C, obtains third mixing；
(4) the third mixing is added in describedization paraffin pan, is uniformly mixed with the second mixing of remainder, while stirring
It is added 0.5~5.0 part of dispersing agent, 3.0~10.0 parts of calcium carbonate, talcum powder 20.0~30.0 is added while stirring after mixing
Part, 7.0~12.0 parts of kaolin, 5.0~15.0 parts of barium sulfate, constant temperature is between 75-80 DEG C, and stirring is until all material disperses
Be uniformly mixed, then while stirring be added 0.5~3.0 part of coupling agent, constant temperature between 75-80 DEG C, be dispersed with stirring coupling 3 hours with
On, obtain the 4th mixing；
(5) the 4th mixing is poured into wax crayon molding machine and carries out molding production, obtain crayon core.
Preferably, heating temperature described in step (1) is 80-85 DEG C.
Preferably, the mixing speed of high-speed stirred described in step (2) is 1000~1800r/min；In step (4)
The mixing speed of the stirring is 800~1200r/min, is aided with center stirring 80-105r/min.
Preferably, the third mixing after the grinding needed 600 meshes in step (3).
Such high pen tip intensity drawing wax crayon of the invention, has the following technical effect that
1, by pen tip body fits penholder ontology, positioning and fixation for crayon core are realized, meanwhile, it is easy to implement tune
The use for saving crayon core, crayon core is adjusted when exhausting；
2, water storing bin is set on penholder ontology, for storing water, while is convenient for the water that will be stored according to specific requirement
It is implanted sequentially in string sink and storage chamber；
3, water storing bin is threaded on penholder ontology, such design, returns to water storage convenient for squeezing water storing bin for water
Storehouse provides condition；
4, crayon core intensity is big, does not break end, while cost does not change, and maintains to have come cheap original of wax crayon product price
Advantage；
5, crayon core has different intensity and toughness using material, by the emulsification and coupling of material, is combined with each other, shape
At a novel mixed system.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is a kind of diagrammatic cross-section of the preferred embodiment of high pen tip intensity drawing wax crayon of the invention.
In figure:
Penholder 1, inner cylinder 11, outer cylinder 12, string sink 13, connecting rod 14；
Pen tip ontology 2, annular storage chamber 21, conus portion 22, cylindrical portion 23, ring-shaped rubber 24；
Crayon core 3；
Water storing bin 4, rubber plug head 41, thread barrel 42 put water dropper 43；
Interior rubber ring 5, outer rubber circle 6.
Specific embodiment
In conjunction with the accompanying drawings, the present invention is further explained in detail.These attached drawings are simplified schematic diagram, only with
Illustration illustrates basic structure of the invention, therefore it only shows the composition relevant to the invention.
Wax crayon, including penholder 1 as shown in Figure 1, a kind of high pen tip intensity of the invention is painted, connect with 1 screw thread of penholder
The pen tip ontology 2 connect, the crayon core 3 being threaded in 1 ontology of penholder and pen tip ontology 2, the head of crayon core 3 are in circular cone
Head can be such that it leans out again and be provided enough uses before high pen tip intensity drawing wax crayon uses totally with Rotary wax crayon core 3
Length.
The fixed water storing bin 4 in the 1 ontology upper end of penholder；It can be drawn in water storing bin 4 and store water.
Annular storage chamber 21 is opened up from end face thereon on the pen tip ontology 2；
The penholder 1 includes inner cylinder 11 and outer cylinder 12, and the upper surface of the outer cylinder 12 offers screw thread annular groove, the inner cylinder
11 inner sleeves are in the outer cylinder 12 and are spaced to form string sink 13, and the outer wall of the inner cylinder 11 and the inner wall of the outer cylinder 12 pass through
Connecting rod 14 is fixedly connected；
The water storing bin 4 includes rubber plug head 41 and is fixed on thread barrel 42 under the rubber plug head 41, the rubber plug head 41
Lower end surface there are several water droppers 43, several water droppers 43 are distributed in a ring；
Described water dropper 43 protrudes into the string sink 13, and the thread barrel 42 is threaded in the screw thread annular groove, institute
The lower end and the annular storage chamber 21 for stating string sink 13 interconnect.
Such pen tip cooperates 1 ontology of penholder by pen tip ontology 2, realizes positioning and fixation for crayon core 3, meanwhile,
It is easy to implement the use for adjusting crayon core 3, crayon core 3 is adjusted when exhausting；Water storing bin 4 is set on 1 ontology of penholder, for storing
Water, while convenient for the water of storage to be implanted sequentially in string sink 13 and storage chamber according to specific requirement；Water storing bin 4 is screw thread
It is connected on 1 ontology of penholder, such design, provides condition convenient for squeezing water storing bin 4 to return to water storing bin 4 for water.
When using the high pen tip intensity drawing wax crayon, water storing bin 4 is screwed off first, rubber plug head 41 is then squeezed, passes through
The point realization of water dropper 43 injects water into rubber plug head 41, and then thread barrel 42 is threaded in screw thread annular groove again, realizes rubber plug
First 41 fixation, meanwhile, rubber plug head 41 is squeezed, so that water extruding is fallen into string sink 13 and pen tip ontology 2 is fallen by string sink 13 again
In interior annular storage chamber 21；
User gradually slowly adds according to the gravity requirement at the pen tip ontology 2 for using the high pen tip intensity drawing wax crayon
Enter water until meet oneself demand, meanwhile, when the gravity at pen tip ontology 2 reaches individual and requires, head mistake in order to prevent
Weight, can screw off use for water storing bin 4.
, can be by the way that water be poured out when needing for the water in pen tip ontology 2 and penholder 1 to be discharged, it can also be by rubber plug
First 41 squeeze, and being under squeezed state leads to rubber plug head 41, at this point, rubber plug head 41 absorbs water, water are made to suck back water storing bin
In 4.
In the present embodiment, the pen tip ontology 2 includes the conus portion 22 being wholely set and cylindrical portion 23, the cylindrical portion
23 side wall has been wholely set ring-shaped rubber 24, the inner wall phase of the inner sidewall of the ring-shaped rubber 24 and the annular storage chamber 21
It connects.The setting of ring-shaped rubber 24 can be used to realize the effect of the massage of people's hand first, meanwhile, squeeze ring-shaped rubber 24, energy
Enough promote the agitation of water, and soft ring-shaped rubber 24 can also realize the massage effect of human hand.
In the present embodiment, the outer wall of the ring-shaped rubber 24 is in ellipsoid.Ellipsoid convenient for massage and squeezes, is convenient for
People are hand-held to use high pen tip intensity drawing wax crayon.
In the present embodiment, interior rubber ring 5 and outer rubber are provided on the binding face of the pen tip ontology 2 and the penholder 1
Cushion rubber 6, the interior rubber ring 5 are located at the inner ring of the annular storage chamber 21；The outer rubber circle 6 is located at the annular water storage
The outer ring of chamber 21.Interior rubber ring 5 cooperates outer rubber circle 6, realizes good sealing effect, prevent water rushes down place.
In the present embodiment, the surface of the ring-shaped rubber 24 has several massage convexes, and the presence of massage convex is convenient for
The fatigue of preferable buffering people's hand.
Preparation process:
Check production equipment it is whether normal, after passed examination, toward change paraffin pan in, addition paraffin, microwax, polyethylene wax,
Vaseline, fixed oil, stearic acid, glyceryl monostearate, palmitic acid, lauric acid, charging finish, and open heating equipment system,
Material is heated, after melting completely, opens stirring, emulsifier is added in 75-80 DEG C of high-speed stirred of constant temperature while stirring,
Until all materials are emulsified completely as uniform liquid.After material emulsifies completely, from changing the liquid that emulsifies completely of discharge section in paraffin pan
Body high-temperature material is added pigment toner, is uniformly mixed while hot, ground and mixed is uniform immediately in regulation container.75-80 DEG C of constant temperature
Between, it will be uniformly mixed in ground coloured material additionization paraffin pan.After mixing, dispersing agent is added while stirring, mixes
After uniformly, be added calcium carbonate, talcum powder, kaolin, the materials such as barium sulfate while stirring, between 75-80 DEG C of constant temperature, stirring until
All material dispersion mixing is uniform, then coupling agent is added while stirring, between 75-80 DEG C of constant temperature, be dispersed with stirring coupling 3 hours with
On, visual detection material in container, other uneven color phenomenons such as no vitta, color lump, coloured particles are as uniformly mixed.It closes
After lattice, wax crayon molding machine carries out formed product production, in process of production, carries out self-test, sampling observation, it is ensured that product quality to product
Stablize and meet the requirements, until formed product production process terminates, high pen tip intensity (45 best in quality can be produced
Degree) drawing wax crayon product.
Obtained crayon core quality requirement:
Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above description, relevant staff is complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.
Claims (10)
- The wax crayon 1. a kind of high pen tip intensity is painted, including penholder, the pen tip ontology being threadedly coupled with the penholder are threaded in Penholder ontology and the intrinsic crayon core of pen tip, it is characterised in that: the fixed water storing bin in penholder ontology upper end；The pen tip sheet Annular storage chamber is opened up from end face thereon on body；The penholder includes inner barrel and outer barrel, and the upper surface of the outer cylinder offers spiral shell Line annular groove, the inner cylinder inner sleeve in the outer cylinder and are spaced to form string sink, and the outer wall of the inner cylinder is interior with the outer cylinder Wall is fixedly connected by connecting rod；The water storing bin includes rubber plug head and is fixed on thread barrel under the rubber plug head, the rubber plug The lower end surface of head has several water droppers, and several water droppers are distributed in a ring；Described water dropper protrudes into the string sink, described Thread barrel is threaded in the screw thread annular groove, and the lower end of the string sink is interconnected with the annular storage chamber.
- The wax crayon 2. high pen tip intensity as described in claim 1 is painted, it is characterised in that: the pen tip ontology includes being wholely set Conus portion and cylindrical portion, the side wall of the cylindrical portion be wholely set ring-shaped rubber, the inner sidewall of the ring-shaped rubber and institute The inner wall for stating annular storage chamber connects.
- The wax crayon 3. high pen tip intensity as claimed in claim 2 is painted, it is characterised in that: the outer wall of the ring-shaped rubber is in ellipsoid Face.
- The wax crayon 4. high pen tip intensity as claimed in claim 3 is painted, it is characterised in that: the pen tip ontology and the penholder Interior rubber ring and outer rubber circle are provided on binding face, the interior rubber ring is located at the inner ring of the annular storage chamber；It is described outer Rubber ring is located at the outer ring of the annular storage chamber.
- The wax crayon 5. high pen tip intensity as claimed in claim 3 is painted, it is characterised in that: if the surface of the ring-shaped rubber has Dry massage convex.
- The wax crayon 6. high pen tip intensity as described in claim 1 is painted, which is characterized in that the crayon core includes following quality Part: 20.0~30.0 parts of paraffin, 2.0~5.0 parts of microwax, 1.0~3.0 parts of polyethylene wax, 1.0~5.0 parts of vaseline, hardening Oily 15.0~25.0 parts, 2.0~15.0 parts of stearic acid, 1.0~5.0 parts of glyceryl monostearate, palmitic acid 2.0~5.0 part, month 1.0~3.0 parts of cinnamic acid, 3.0~10.0 parts of calcium carbonate, 20.0~30.0 parts of talcum powder, 7.0~12.0 parts of kaolin, barium sulfate 5.0~15.0 parts, 0.5~5.0 part of dispersing agent, 1.0~3.0 parts of emulsifier, 0.5~3.0 part of coupling agent, pigment 0.5~2.0 Part.
- The wax crayon 7. high pen tip intensity as described in claim 1 is painted, which is characterized in that the crayon core the preparation method comprises the following steps:(1) to changing in paraffin pan, 20.0~30.0 parts of paraffin, 2.0~5.0 parts of microwax, 1.0~3.0 parts of polyethylene wax, all is added 1.0~5.0 parts of intellectual circle, 15.0~25.0 parts of fixed oil, 2.0~15.0 parts of stearic acid, 1.0~5.0 parts of glyceryl monostearate, 2.0~5.0 parts of palmitic acid, 1.0~3.0 parts of lauric acid, heat material after charging, until melting completely, obtain the One mixing；(2) blender is opened, 75-80 DEG C of high-speed stirred of constant temperature is added 1.0~3.0 parts of emulsifier while stirring, and it is straight to continue stirring It is emulsified completely to first mixing as uniform liquid, the second mixing of acquisition；(3) the second mixing of part is taken out from describedization paraffin pan in container, is added 0.5~2.0 part of pigment, ground and mixed is equal It is even, and constant temperature obtains third mixing between 75-80 DEG C；(4) the third mixing is added in describedization paraffin pan, is uniformly mixed with the second mixing of remainder, is added while stirring 0.5~5.0 part of dispersing agent, after mixing while stirring be added 3.0~10.0 parts of calcium carbonate, 20.0~30.0 parts of talcum powder, 7.0~12.0 parts of kaolin, 5.0~15.0 parts of barium sulfate, constant temperature is between 75-80 DEG C, and stirring is until all material dispersion is mixed Close uniformly, then while stirring be added 0.5~3.0 part of coupling agent, constant temperature between 75-80 DEG C, be dispersed with stirring coupling 3 hours with On, obtain the 4th mixing；(5) the 4th mixing is poured into wax crayon molding machine and carries out molding production, obtain crayon core.
- The wax crayon 8. high pen tip intensity as claimed in claim 7 is painted, it is characterised in that: heating temperature described in step (1) is 80-85℃。
- The wax crayon 9. high pen tip intensity as claimed in claim 7 is painted, it is characterised in that: high-speed stirred described in step (2) Mixing speed is 1000~1800r/min；The mixing speed of stirring described in step (4) is 800~1200r/min, is aided with The heart stirs 80-105r/min.
- The wax crayon 10. high pen tip intensity as claimed in claim 7 is painted, it is characterised in that: in step (3), after the grinding Third mixing needed 600 meshes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910291282.8A CN109968866B (en) | 2019-04-11 | 2019-04-11 | High-strength nib painting crayon |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910291282.8A CN109968866B (en) | 2019-04-11 | 2019-04-11 | High-strength nib painting crayon |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109968866A true CN109968866A (en) | 2019-07-05 |
| CN109968866B CN109968866B (en) | 2023-09-29 |
Family
ID=67084254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910291282.8A Active CN109968866B (en) | 2019-04-11 | 2019-04-11 | High-strength nib painting crayon |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109968866B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110452583A (en) * | 2019-09-02 | 2019-11-15 | 温州市骄泰文具有限公司 | A kind of erasable plastics wax crayon and preparation method thereof |
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| JP2009234265A (en) * | 2009-04-28 | 2009-10-15 | Naoki Toyokawa | Using method of fountain pen and weight-adjusting tool of fountain pen |
| CN101993636A (en) * | 2009-08-17 | 2011-03-30 | 真彩文具有限公司 | Crayon and manufacturing method thereof |
| CN202180668U (en) * | 2011-08-26 | 2012-04-04 | 复旦大学附属中学 | Balanced pen |
| CN103692823A (en) * | 2014-01-08 | 2014-04-02 | 张天雨 | Magnetic pen with adjustable weight |
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|---|---|---|---|---|
| US6799918B1 (en) * | 2003-09-16 | 2004-10-05 | William L. Scolnik | Selecting weight and balance in writing implements |
| KR20080052702A (en) * | 2006-12-08 | 2008-06-12 | 신한수 | Dummbells ball pen |
| KR20090007910U (en) * | 2008-01-31 | 2009-08-05 | 민병승 | Swing pen |
| CN201201427Y (en) * | 2008-03-27 | 2009-03-04 | 胡海明 | Posture correcting intelligent pen |
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| JP2009234265A (en) * | 2009-04-28 | 2009-10-15 | Naoki Toyokawa | Using method of fountain pen and weight-adjusting tool of fountain pen |
| CN101993636A (en) * | 2009-08-17 | 2011-03-30 | 真彩文具有限公司 | Crayon and manufacturing method thereof |
| CN202180668U (en) * | 2011-08-26 | 2012-04-04 | 复旦大学附属中学 | Balanced pen |
| CN103692823A (en) * | 2014-01-08 | 2014-04-02 | 张天雨 | Magnetic pen with adjustable weight |
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| CN110452583A (en) * | 2019-09-02 | 2019-11-15 | 温州市骄泰文具有限公司 | A kind of erasable plastics wax crayon and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| CN109968866B (en) | 2023-09-29 |
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