CN111319379A - Pencil lead protection pencil and preparation method thereof - Google Patents
Pencil lead protection pencil and preparation method thereof Download PDFInfo
- Publication number
- CN111319379A CN111319379A CN202010307281.0A CN202010307281A CN111319379A CN 111319379 A CN111319379 A CN 111319379A CN 202010307281 A CN202010307281 A CN 202010307281A CN 111319379 A CN111319379 A CN 111319379A
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- Prior art keywords
- pencil
- lead
- film
- carbon
- pencil lead
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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
- B43K19/02—Pencils with graphite; Coloured pencils
-
- 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
- B43K19/16—Making non-propelling pencils
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- Inks, Pencil-Leads, Or Crayons (AREA)
Abstract
The invention discloses a pencil lead protection pencil and a preparation method thereof. The outer surface of the carbon painting core is sheathed with the thermal shrinkage film, the thermal shrinkage film is coated on the surface of the carbon painting core after being heated and shrunk, so that the film is shrunk and attached to the carbon painting core, then the two ends of the carbon painting core are aligned, and the carbon painting pencil is produced according to the traditional pencil manufacturing process. The thermal shrinkage film plays a role in isolating the contact of the carbon painting core from water and glue, so that the original performance index is kept after the carbon painting core is made into a pencil. The invention does not change the original process technology on the pencil production main body, and only effectively plays a role of isolating moisture and glue by sleeving the thermal shrinkage film on the pencil lead, so that the indexes of the manufactured carbon drawn pencil are basically consistent with the original indexes of the carbon drawn pencil lead, and other indexes after the pencil is manufactured are normal. The invention is also suitable for the conditions that the pencil lead has adsorption reaction, dissolution reaction and other changes or reactions with moisture and glue, and the like, and comprises carbon drawing pencils, matt pencils, water-soluble colored pencils and the like.
Description
Technical Field
The invention relates to a pencil lead protection pencil and a preparation method thereof, belonging to the field of pencil lead protection pencils and preparation thereof.
Background
In the traditional wood-bar pencil, a pencil lead is bonded in a groove formed by two wood plates through glue to form the pencil bar. The existing production technology and process of the wooden-holder pencil are suitable for producing common graphite pencils and common oily colored pencils. However, the carbon drawn pencil has the defects of the technology and the process, such as: in the process of manufacturing the carbon painting pencil, the carbon painting pencil lead is produced by a professional factory, and because the carbon painting pencil contains charcoal powder which is easy to absorb moisture in the storage process before the pencil is manufactured, in the process of manufacturing the carbon painting pencil, the carbon painting lead absorbs moisture and glue in glue water, so that indexes such as the concentration of the pencil lead, the stress of the pencil lead tip and the like are obviously changed, the hand feeling is hard and becomes astringent, the concentration is reduced, and the quality of the finished product pencil is influenced. Table 1 shows the detection data of the original carbon painting lead and the detection data after the pencil is made according to the traditional process and technology, and shows that the concentration of the finished carbon painting pencil lead is reduced in different degrees, the stress index of the lead tip is increased, the hand feeling is hard and the change of puckery is difficult.
TABLE 1 original test data of carbon writing core and test data of pencil manufactured by conventional process and technique
The original carbon painting pencil lead has excellent indexes such as the softness of hand feeling, concentration detected by instruments and the like, but the difference of the manufactured pencil lead is large, which is a pain point in the industry at present, and carbon painting pencils of various large brands basically have similar problems, so that improvement is urgently needed.
Disclosure of Invention
The invention mainly aims to solve the technical problems of concentration reduction and hand feeling hardening caused by the adsorption of water and glue on the carbon painting core in the process of manufacturing a pencil with a carbon painting, so that the performance of the carbon painting core after the carbon painting pencil is manufactured into a pencil is basically consistent with that of the carbon painting core before the pencil is manufactured.
After a lot of experiments, the inventor can not ensure that the performances of the manufactured carbon painting pencil and the carbon painting core are basically consistent by coating various waxes, glues, protective agents, protective coatings and the like on the surface of the carbon painting core, and the root of the inventor is that the carbon painting core contains charcoal powder which has strong adsorbability, and a heat shrinkage film only plays a role in cladding and isolation and has no chemical reaction with the carbon painting core and no possibility of being adsorbed. After adopting a plurality of schemes for tests, the inventor finds that a thermal shrinkage film is sleeved on the outer surface of a carbon painting core, the thermal shrinkage film is coated on the surface of the carbon painting core in a heating shrinkage mode, a pencil core sleeved with the thermal shrinkage film is heated to enable the film to shrink and be attached, then two ends of the film are aligned, then a carbon painting pencil is normally produced according to the traditional pencil manufacturing process, the thermal shrinkage film plays a role in isolating contact of the carbon painting core from moisture and glue, the thermal shrinkage film plays a role in functional protection, and therefore the original performance index of the carbon painting core after being manufactured into the pencil is kept, and the technical problem to be solved by the invention is solved.
Therefore, the invention provides a pencil lead protective pencil which can keep the original performance index after a carbon painting lead is made into the pencil, and the pencil lead protective pencil sequentially comprises a paint layer, a wood rod layer and a pencil lead from outside to inside; wherein a heat shrinkable film is arranged between the wood rod layer and the pencil lead; the heat shrinkable film is formed by folding or overlapping thermoplastic films; the thickness of the heat shrinkable film may be 0.01 to 0.08mm, preferably 0.05 mm.
The pencil lead can be various pencil leads such as carbon drawing pencil leads, matt pencil leads or water-soluble colored pencil leads.
In order to make the thermoplastic film and the wood rod layer tightly fit, a glue layer is arranged between the thermoplastic film and the wood rod layer.
The invention can isolate the carbon painting core from water and glue by coating the surface of the carbon painting core with the thermal shrinkage film, so that the carbon painting core can have the same initial performance as the carbon painting core, and all performances in the process of manufacturing the pencil and after manufacturing the pencil are normal.
The invention further provides a preparation method of the pencil with the pencil lead protection function, which comprises the following steps:
(1) selecting or preparing a heat shrinkage film capable of being sleeved with the pencil lead according to the diameter of the pencil lead; (2) and heating and shrinking the thermal shrinkage film, coating the thermal shrinkage film on the surface of the pencil lead, aligning the ends of the pencil lead, and preparing the pencil lead protection pencil according to a conventional pencil manufacturing process.
The pencil lead can be various pencil leads such as carbon drawing pencil leads, matt pencil leads or water-soluble colored pencil leads.
Wherein the heat shrinkable film is formed by folding or overlapping thermoplastic films; the thickness of the heat shrinkable film may be 0.01 to 0.08mm, preferably 0.05 mm. The thermoplastic film comprises thermoplastic films made of various materials such as PE, PP, PET, OPP, PVDC, POF and the like.
For reference, the present invention provides a specific method for preparing a heat shrinkable film, comprising: cutting a PVC transparent film material with the thickness of 0.05mm and the length of 186mm into a strip shape with the width of 23mm, folding one end of the PVC transparent film material in the width direction along the position of 5mm, folding the other end of the PVC transparent film material in the position of 8mm, forming an overlap with the lap width of 3mm by the folded film, coating glue at the lap overlapping position to form a cylindrical heat shrinkable film with the length of 186mm, the diameter of about 6.3mm and the diameter of 20 mm; the thermal contraction film can be sleeved into a pen core with the diameter of 4mm and the length of 184 mm.
The invention can adjust the diameter of the film according to the difference of the diameter of the pen core, can be customized by machine equipment when the batch is large, and has the same film forming principle
The conventional pencil manufacturing process comprises the following steps: the pencil board is grooved by adopting a grooved rubber core connecting wire, and the groove depth is enlarged by 0.02-0.05 mm according to the diameter of the sleeved pencil core; brushing a small amount of white latex on the two grooved pencil boards respectively, putting the pencil boards into a film-shrinking and head-aligning pencil lead, and combining the two pencil boards to form a pencil rubber board; clamping a plurality of pencil rubber plates together by using a binding clip, and drying in a drying chamber; adopting a high-speed double-cutter shaft planing machine to prepare the dried pencil rubber plate into a white-holder pencil; painting the white-holder pencil to obtain the pencil.
The invention is also suitable for the conditions that the pencil lead has adsorption reaction, dissolution reaction and other changes or reactions with moisture and glue, and the like, and comprises carbon drawing pencils, matt pencils, water-soluble colored pencils and the like.
The invention does not need to change the process technology on the original pencil production main body, and only plays a role of isolating moisture and glue by sleeving the thermal shrinkage film on the pencil lead, so that the indexes of the manufactured carbon drawn pencil are basically consistent with the original indexes of the carbon drawn pencil lead, and other indexes after the pencil is manufactured are normal.
Drawings
FIG. 1 is a cross-sectional view of a lead protective pencil according to the present invention; 1-pencil lead, 2-thermal shrinkage film, 3-glue layer, 4-wood rod layer and 5-paint layer.
Detailed Description
The invention is further described below in conjunction with specific embodiments, the advantages and features of which will become apparent from the description. These examples are illustrative only and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be within the scope of the invention.
Preparation of Heat shrinkable film of preparatory example
The materials used by the heat shrinkable film are various thermoplastic films, including PE, PP, PET, OPP, PVDC, POF and other materials, which can be made into the required heat shrinkable film through tests.
PVC film manufacturers and related glue in the market are very much, the test selects PVC calendered film of Shanghai Dayu film Co., Ltd and HN-404 quick-drying PVC glue of Haoyao electronics Co., Ltd, and the PVC calendered film is determined after multiple tests according to the specific processing technology of the pencil core and the pencil.
The film material is PVC transparent, thickness is 0.05mm, length is 186mm, cut into the strip of width 23mm, in the position fifty percent discount of width direction one end along 5mm, the other end along 8mm position fifty percent discount, the membrane after the fifty percent discount forms the overlap joint width and is 3 mm's overlap joint, scribble glue at overlap joint position, formed length 186mm like this, the diameter is about 6.3mm, diameter develops the cylinder membrane of girth 20mm, diameter 4mm, length 184 mm's refill can be emboliaed to this membrane.
The diameter of the film can be adjusted according to different diameters of the pen core, the film can be customized by machine equipment when the batch size is large, the film forming principle is the same, and the film is ready for use.
EXAMPLE 1 preparation of lead-protected Pencil
1. Sleeving the prepared heat shrinkable film on a pencil lead (manual sleeving), heating the heat shrinkable film (infrared heating film shrinking machine BGS-2615 of Wenzhou first-direction machinery Co., Ltd.) to enable the heat shrinkable film to be attached to the surface of the pencil lead, and completely attaching the film and the lead by controlling the temperature and the speed of a conveyer belt;
2. aligning two ends of the film-shrunk pen core by about 1mm respectively by using a conventional grinding head machine, and removing a small part of film exposed out of the end or the end of the core which is not completely covered by the film;
3. planing a pencil board into a groove (planing rubber core connecting line BCJXLJX-60-I of Prolo mechanical manufacturing Limited, Fuzhou) according to a conventional pencil manufacturing process, wherein the depth of the groove is enlarged by 0.02-0.05 mm according to the diameter of a pencil core sleeved with a film; the equipment automatically brushes a small amount of white latex on the two grooved pencil boards respectively, a pencil lead with a shrinking film and a neat head is put into the pencil boards by taking the amount of the micro-visible latex on the surface layer as the benefit, and the two pencil boards are combined together to form a pencil rubber board;
4. clamping a plurality of pencil rubber plates together by using a binding clamp, controlling the binding force to be 3-4 kgf, entering a drying chamber, drying at 40-45 ℃ for 12 hours;
5. the dried pencil rubber plate is made into a white-penholder pencil (a high-speed double-cutter shaft planing machine BGJ-080-II of Prolo mechanical manufacturing Co., Ltd., Fuzhou);
6. white pencils were painted (four pencil paint automation line SZSD-YQJ-001, purlo mechanical manufacturing, fozhou).
7. According to different requirements, the items of top dipping, sharpening, LOGO printing and packaging are specifically carried out, and finished carbon drawing pencils, matt pencils and colored pencils are manufactured.
The schematic cross section of the prepared pencil lead protection pencil is shown in figure 1, and the schematic cross section comprises a paint layer 5, a wood rod layer 4, a glue layer 3, a heat shrinkage film layer 2 and a pencil lead 1 from outside to inside in sequence; the thickness of the heat shrinkable film layer 2 may be 0.01 to 0.08mm, preferably 0.05 mm.
Test example 1 test for testing the Properties of lead-protecting Pencil
Test materials and methods
1.1 the test conditions were as follows:
a) ambient temperature: (20 +/-2) DEG C;
b) relative humidity: 50 to 65 percent.
1.2 instruments and materials
Reflection-type photoelectric colorimeter. And (4) a cross scribing instrument. 120g/m in accordance with QB/T1012-2Offset printing paper. A core tip gauge plate with a bore diameter of 2.0 mm. (selected according to the characteristics of the carbon-drawn pencil)
1.3 test objects
(1) Various specifications of carbon picture cores (soft, medium and hard); (2) preparing a carbon painting pencil by using a carbon painting core according to a traditional pencil making process (the carbon painting core is not coated by a heat shrinkage film); (3) the carbon drawn pencil prepared in example 1 (the carbon drawn pencil prepared after adding the protective film, except for adding the heat shrinkage film, the other preparation processes are completely the same as the traditional pencil preparation process).
1.4 methods and procedures
Sharpening various test objects to be detected in a pencil sharpener with the angle of (20 +/-1) °, modifying the pencil lead by using a pencil sharpener, inserting the pencil lead into a lead sharpening gauge plate, and grinding the exposed part by using metallographic abrasive paper to obtain a flat end face. 120g/m2The smooth surface of offset printing paper is upwards arranged on a smooth metal plate of a scriber for fixing, then a test pen is inserted into a pen holder, a heavy hammer on a lever of the pen holder is adjusted, a 500g weight is added, equipment is started, a carbon painting core is used for scribing on offset printing paper, 15 lines are scribed at one time, the length of each line is 60mm, after 15 lines are drawn each time, 45 degrees are sequentially selected for continuous scribing, 4 times are scribed in total, and a square with the center side length of a scribing trace being 25 +/-1 mm is taken as sample paper.
The photoelectric colorimeter was adjusted, an interference filter having a center wavelength of 450nm was selected, the sample was placed in a dark box, measurement was performed 3 times, the indication on the "-logT" scale line for each time was recorded, and the average value was determined as the final value.
2 results of the test
The results are shown in Table 2.
From the detection results, the concentration of the carbon painting pencil prepared by the carbon painting core according to the traditional pencil making process (the carbon painting core is not coated by the heat shrinkage film) is obviously reduced compared with that of the carbon painting core, and the concentration of the carbon painting pencil prepared in the example 1 (the carbon painting pencil prepared after the protective film is added) is basically unchanged compared with that of the carbon painting pencil core.
Table 2 concentration test results of lead protecting pencil
Claims (10)
1. The pencil lead protective pencil comprises a paint layer (5), a wood rod layer (4) and a pencil lead (1) from outside to inside in sequence, and is characterized in that a heat shrinkage film (2) is arranged between the wood rod layer (4) and the pencil lead (1).
2. The lead-protecting pencil as claimed in claim 1, wherein said heat-shrinkable film (2) is composed of a thermoplastic film folded or overlapped together.
3. The lead-protecting pencil as claimed in claim 1 or 2, wherein the thickness of said heat shrinkable film (2) is 0.01 to 0.08mm, preferably 0.05 mm.
4. The lead protective pencil according to claim 1 or 2, characterized in that the pencil lead (1) is a carbon drawn pencil lead, a matte pencil lead or a water-soluble colored pencil lead.
5. The lead-protecting pencil as claimed in claim 1 or 2, wherein a glue layer (3) is provided between the thermoplastic film (2) and the wood shaft layer (4).
6. A method for producing a lead-protected pencil according to claim 1 or 2, which comprises:
(1) selecting or preparing a heat shrinkage film capable of being sleeved with the pencil lead with the corresponding diameter according to the diameter of the pencil lead; (2) and heating and shrinking the thermal shrinkage film, then coating the thermal shrinkage film on the surface of the pencil lead, aligning the two ends of the thermal shrinkage film, and preparing the pencil lead protection pencil according to the conventional pencil manufacturing process.
7. The method for preparing a pencil as defined in claim 6, wherein said pencil lead is a carbon drawn pencil lead, a matte pencil lead or a water-soluble colored pencil lead.
8. The process according to claim 6, wherein the heat shrinkable film is formed by folding or superposing thermoplastic films; the thermoplastic film comprises PE, PP, PET, OPP, PVDC or POF.
9. The method of manufacturing according to claim 6, wherein the method of manufacturing the heat shrinkable film comprises: cutting a PVC transparent film material with the thickness of 0.05mm and the length of 186mm into a strip with the width of 23mm, folding one end of the PVC transparent film material in the width direction along the position of 5mm, folding the other end of the PVC transparent film material in the position of 8mm, forming an overlap with the lap width of 3mm by the folded film, coating glue at the lap overlapping position to form a cylindrical heat shrinkable film with the length of 186mm, the diameter of about 6.3mm and the diameter of 20 mm.
10. The method of claim 6, wherein said conventional pencil making process comprises: the pencil board is grooved by adopting a grooved rubber core connecting wire, and the groove depth is enlarged by 0.02-0.05 mm according to the diameter of the sleeved pencil core; brushing a small amount of white latex on the two grooved pencil boards respectively, putting the pencil boards into a film-shrinking and head-aligning pencil lead, and combining the two pencil boards to form a pencil rubber board; clamping a plurality of pencil rubber plates together by using a binding clip, and drying in a drying chamber; adopting a high-speed double-cutter shaft planing machine to prepare the dried pencil rubber plate into a white-holder pencil; the white-holder pencil was painted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010307281.0A CN111319379A (en) | 2020-04-17 | 2020-04-17 | Pencil lead protection pencil and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010307281.0A CN111319379A (en) | 2020-04-17 | 2020-04-17 | Pencil lead protection pencil and preparation method thereof |
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| CN111319379A true CN111319379A (en) | 2020-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010307281.0A Pending CN111319379A (en) | 2020-04-17 | 2020-04-17 | Pencil lead protection pencil and preparation method thereof |
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1568377A (en) * | 1967-04-08 | 1969-05-23 | ||
| GB2084084A (en) * | 1980-09-22 | 1982-04-07 | Oreal | Pencil, having a sleeve made of plastic, and process for the manufacture of same |
| EP0505262A1 (en) * | 1991-03-19 | 1992-09-23 | Conte S.A. | Method of manufacturing a crayon or pencil by triple extrusion, crayon or pencil featuring an intermediate protective jacket for the lead |
| CN1309031A (en) * | 2000-02-12 | 2001-08-22 | 马文臣 | Method for decorating end of pencil |
| CN1394760A (en) * | 2001-07-09 | 2003-02-05 | 李枝官 | Medium fine shaft pencil and its production method |
| CN200960793Y (en) * | 2006-04-29 | 2007-10-17 | 朱杨林 | Pencil |
| CN201353932Y (en) * | 2009-02-16 | 2009-12-02 | 田玉环 | Paper wrapped charcoal pencil |
| CN201456675U (en) * | 2009-06-29 | 2010-05-12 | 田玉环 | Scroll water-soluble coloured pencil |
| CN103587283A (en) * | 2013-11-26 | 2014-02-19 | 安硕文教用品（上海）股份有限公司 | Carbon pen and manufacturing method thereof |
| CN104191863A (en) * | 2014-09-11 | 2014-12-10 | 长沙阿斯玛文化用品有限公司 | Environment-friendly pencil production method and special glue thereof |
| CN105176200A (en) * | 2015-09-10 | 2015-12-23 | 颍上县满天星文具用品有限公司 | Environmentally friendly colored pencil |
| CN107257739A (en) * | 2014-12-17 | 2017-10-17 | 康特公司 | Writing is used or coloring pencil |
| CN213413352U (en) * | 2020-04-17 | 2021-06-11 | 哈尔滨隆之道科技有限公司 | Pencil with protective pencil lead |
-
2020
- 2020-04-17 CN CN202010307281.0A patent/CN111319379A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1568377A (en) * | 1967-04-08 | 1969-05-23 | ||
| GB2084084A (en) * | 1980-09-22 | 1982-04-07 | Oreal | Pencil, having a sleeve made of plastic, and process for the manufacture of same |
| EP0505262A1 (en) * | 1991-03-19 | 1992-09-23 | Conte S.A. | Method of manufacturing a crayon or pencil by triple extrusion, crayon or pencil featuring an intermediate protective jacket for the lead |
| CN1309031A (en) * | 2000-02-12 | 2001-08-22 | 马文臣 | Method for decorating end of pencil |
| CN1394760A (en) * | 2001-07-09 | 2003-02-05 | 李枝官 | Medium fine shaft pencil and its production method |
| CN200960793Y (en) * | 2006-04-29 | 2007-10-17 | 朱杨林 | Pencil |
| CN201353932Y (en) * | 2009-02-16 | 2009-12-02 | 田玉环 | Paper wrapped charcoal pencil |
| CN201456675U (en) * | 2009-06-29 | 2010-05-12 | 田玉环 | Scroll water-soluble coloured pencil |
| CN103587283A (en) * | 2013-11-26 | 2014-02-19 | 安硕文教用品（上海）股份有限公司 | Carbon pen and manufacturing method thereof |
| CN104191863A (en) * | 2014-09-11 | 2014-12-10 | 长沙阿斯玛文化用品有限公司 | Environment-friendly pencil production method and special glue thereof |
| CN107257739A (en) * | 2014-12-17 | 2017-10-17 | 康特公司 | Writing is used or coloring pencil |
| CN105176200A (en) * | 2015-09-10 | 2015-12-23 | 颍上县满天星文具用品有限公司 | Environmentally friendly colored pencil |
| CN213413352U (en) * | 2020-04-17 | 2021-06-11 | 哈尔滨隆之道科技有限公司 | Pencil with protective pencil lead |
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