JPH07314988A - Manufacture of writing board - Google Patents

Abstract

PURPOSE:To provide a method for manufacturing a writing board which is less costly, light weight, hardly scratched and demonstrates high writing and 'pen touch' properties. CONSTITUTION:This method for manufacturing a writing board consists of a step to apply an ultraviolet beam-curable resin paint to one lateral facing of a soft polyvinyl chloride sheet 1b and form a writing surface 2 with a cured film by the emission of an ultraviolet beam to the applied facing and a step to form a substrate by junctioning the other lateral facing of the soft polyvinyl chloride sheet 1b with a hard polyvinyl chloride sheet 1a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a writing board used as a meeting board or a schedule board.

[0002]

2. Description of the Related Art As a writing board which is used as a meeting board or a schedule board and which can be freely written with a marking pen and can easily erase a written mark, conventionally, an iron board or There is a enamel coated aluminum plate surface. However, a writing board with a metal plate surface such as an iron plate or an aluminum plate coated with enamel is heavy, which is inconvenient to carry and move, and it is also expensive in price, so an inexpensive and lightweight writing plate is required. Was there.

On the other hand, there is also a writing board in which a polyester film is stuck as a writing surface on the surface of a veneer board or the like. This writing board is cheaper and lighter than a metal board coated with enamel. However, the pen has a drawback that it is less slippery during writing (hereinafter referred to as "writing property") than the writing surface of the enamel, and is easily scratched.
Generally, a writing board such as a meeting board, except for a wall-mounted type, has many opportunities to be moved, and thus has many opportunities to be damaged by being hit. When a scar is left on the writing surface, there is a problem in that ink gets into the scratch and is hard to erase.

In addition to the above-mentioned "writing ability", there is the concept of "pen touch" as an index of the ease of writing during writing. Here, "pen touch" refers to the elasticity and hardness of the writing surface when the writing surface is pressed with a pen, and it may have appropriate elasticity without being too hard to be pressed into the writing surface. Pen touch is soft and preferable. For example, when writing on the paper of the same notebook, it seems that it is more comfortable to write with a soft underlay than with a hard underlay.

The present invention has been made in view of the above circumstances, and an object thereof is to be inexpensive, lightweight, and
Another object of the present invention is to provide a method for producing a writing plate that is not easily scratched and is excellent in writing performance and pen touch.

[0006]

A method for producing a writing board according to claim 1 is characterized in that one side of a soft polyvinyl chloride sheet is
Writing surface forming step of applying an ultraviolet curable resin coating material and irradiating the applied surface with ultraviolet rays to form a cured film to be a writing surface;
And a substrate forming step of joining the other side surface of the soft polyvinyl chloride sheet and the hard polyvinyl chloride sheet.

The method for manufacturing a writing plate according to a second aspect is characterized in that the substrate forming step is performed after the writing surface forming step. The method for manufacturing a writing plate according to a third aspect is characterized in that the writing surface forming step is performed after the substrate forming step. The method for manufacturing a writing board according to claim 4, wherein, prior to the substrate forming step, a printing portion forming step of forming a printing portion on a joint surface between the soft polyvinyl chloride sheet and the hard polyvinyl chloride sheet is performed. It is characterized.

According to a fifth aspect of the present invention, in the method of manufacturing a writing plate according to the fifth aspect, in the substrate forming step, a gap is formed between the soft polyvinyl chloride sheet and the hard polyvinyl chloride sheet so that printed matter can be inserted and removed freely. The other side surface of the soft polyvinyl chloride sheet and the hard polyvinyl chloride sheet are joined to each other so as to form. The method for producing a writing board according to claim 6, wherein the soft polyvinyl chloride sheet is a soft polyvinyl chloride sheet containing 20% by weight or more of a plasticizer and having a thickness of 0.2 mm or more. Is characterized by.

According to a seventh aspect of the present invention, there is provided a method for producing a writing board, wherein the soft polyvinyl chloride sheet contains 35% by weight of a plasticizer.
It is characterized in that a sheet having a thickness of 0.4 to 1.0 mm, which is made of the soft polyvinyl chloride contained above, is used. 9. The method for producing a writing plate according to claim 8, wherein the hard polyvinyl chloride sheet has a UV-curable film serving as a hard writing surface, which is formed on the surface on the side not joined with the soft polyvinyl chloride sheet. It is characterized by using a vinyl chloride sheet.

In the present invention, the term "sheet" is a concept including a film.

[0011]

The method for producing a writing board of the present invention uses a polyvinyl chloride sheet and is therefore inexpensive and lightweight. Moreover, since the writing surface is formed of an ultraviolet curable coating film, it is possible to obtain a writing plate that is hard to be scratched, does not have the tackiness peculiar to a soft general-purpose resin, and has the same writing property as that of the enamel coating. On the other hand, the pen touch depends on the indentation hardness (for example, Rockwell hardness) on the writing surface, and this indentation hardness is largely due to the indentation hardness of the substrate on which the writing surface is configured, but the production of the present invention The writing plate obtained by the method has a soft pen touch because the writing surface is formed on a soft polyvinyl chloride sheet. Further, in the manufacturing method of the present invention, both the writing surface forming step and the substrate forming step can be continuously performed using a long sheet, so that the productivity is high and the production cost can be reduced. it can.

By further performing the printing portion forming step, it is possible to obtain a writing board having a function such as a schedule board on which a fixed printing such as date printing is performed. Moreover, since the printing portion is provided on the joint surface between the soft polyvinyl chloride sheet and the hard polyvinyl chloride sheet, it is possible to obtain an inexpensive writing plate having a printing portion with excellent durability. Furthermore, by joining the soft polyvinyl chloride sheet and the hard polyvinyl chloride sheet so that a gap into which the printed matter can be inserted and removed is formed, the printed matter can be easily replaced as appropriate. Therefore, it is possible to obtain a writing board having a wider range of use as compared with a writing board having a fixed pattern already provided with a printing section.

[0013]

EXAMPLE A method for producing a writing plate of the present invention is one in which one side of a soft polyvinyl chloride sheet is coated with a UV-curable resin coating material, and the coated surface is irradiated with ultraviolet rays to form a cured film to be a writing surface. And a substrate forming step of joining the other side surface of the soft polyvinyl chloride sheet and the hard polyvinyl chloride sheet.

The order of the writing surface forming step and the substrate forming forming step is not particularly limited, and the substrate forming step may be performed after the writing surface forming step, or the writing surface forming step may be performed after the substrate forming step. Alternatively, both steps can be performed simultaneously. When the writing surface forming step and the substrate forming step are performed, the writing plate 10 as shown in FIG. 1 can be obtained.
In the writing board 10, 1a is a hard polyvinyl chloride sheet as a substrate, a soft polyvinyl chloride sheet 1b is joined to one side of the hard polyvinyl chloride sheet 1a, and an ultraviolet curable coating film is further formed on the soft polyvinyl chloride sheet 1b. A writing surface 2 composed of is formed.

The soft polyvinyl chloride sheet 1b used in the present invention is generally made of soft polyvinyl chloride containing 20% by weight or more of a plasticizer and has a thickness from the viewpoint of forming a writing surface having appropriate elasticity. (T ₂ ) is 0.2 mm
The above is the sheet. In particular, from the viewpoint of obtaining the writing surface 2 in which the hardness and softness on the writing surface 2 are appropriately balanced and the pen touch is good, the thickness (t ₂ composed of soft polyvinyl chloride containing 35% by weight or more of the plasticizer is used. ) Is 0.
It is preferable to use a sheet of 4 to 1.0 mm. In general, by using a soft polyvinyl chloride sheet of this range, functionally Rockwell hardness (H _R R) 70~110 can feel the pen touch is excellent, writing surface of preferably from 80 to 100 Can be obtained. Here, Rockwell hardness is 1 of indentation hardness.
It is obtained from the depth of the recess formed by pressing a hard sphere against the writing surface (see JIS K7202).

The type of the UV-curable coating material used in the present invention is not particularly limited, and various unsaturated resin coating materials that can be UV-cured can be used. Specifically, unsaturated polyester resins include those having an unsaturated bond in the main chain, acrylic resins such as unsaturated compounds such as acrylic acid and methacrylic acid as those having an unsaturated bond at the terminal or side chain, Examples thereof include those reacted with a base resin such as an alkyd resin and a urethane resin.

When an ultraviolet curable coating material is applied to one side surface of the soft polyvinyl chloride sheet 1b and the applied surface is irradiated with ultraviolet rays, an ultraviolet curable coating film which becomes the writing surface 2 is formed. The writing surface 2 composed of an ultraviolet curable coating film is homogeneous, dense and beautiful because the unsaturated polymer and the monomer in the coating material are three-dimensionally cross-linked by ultraviolet rays. Therefore, the writing surface 2 formed of the ultraviolet curable coating film is not easily scratched, and has excellent abrasion resistance and chemical resistance. The scratch resistance, i.e. scratch resistance, of UV-cured coatings depends on the amount of plasticizer in the paint,
Although it depends on the cross-linking density of the coating film, etc., the scratch resistance of the ultraviolet curable coating film is generally 2H or more in pencil hardness, which is somewhat inferior to that of enamel (pencil hardness 6H to 8H).
It has scratch resistance to the extent that there is no problem in practical use. In addition, the writability is almost the same as that of the enamel due to the specularity of the ultraviolet curable coating film.

The coating amount of the ultraviolet curable coating material is such that the film thickness t ₃ of the finally obtained ultraviolet curable coating film, that is, the thickness of the writing surface 2 is about 10 to 20 μm. When the thickness is less than 10 μm, the excellent scratch resistance of the ultraviolet-curing coating film is difficult to be exhibited, and when the thickness is more than 20 μm, the indentation hardness on the writing surface 2 becomes high and the writing surface 2 is formed on the surface of the soft polyvinyl chloride sheet. The effect is hard to appear. That is, the soft pen touch feeling is impaired.

The UV irradiation time is generally about 10 to 40 seconds, although it depends on the coating amount of the coating material. in this way,
Since it can be cured at a relatively low temperature in a short time, it forms a hard and beautiful writing surface 2 even on the surface of a soft polyvinyl chloride sheet 1b having a low softening point and not so excellent in solvent resistance. can do. Further, since the article to be coated is a polyvinyl chloride sheet, it is possible to continuously irradiate the entire surface with ultraviolet rays, so that there is no unevenness in curing and the productivity is high.

The hard polyvinyl chloride sheet 1a used in the present invention is a sheet composed of polyvinyl chloride having a plasticizer of less than 10% by weight, and its thickness (t ₁ ) is not particularly limited, but it is used as a writing plate substrate. From the viewpoint of the necessity of maintaining the flatness of the writing plate and the weight reduction, 0.2 mm or more is preferable.
Within such a range, the amount of the plasticizer contained in the polyvinyl chloride and the thickness of the sheet are appropriately selected depending on the application of the writing board and the like.

The soft polyvinyl chloride sheet 1b and the hard polyvinyl chloride sheet 1a can be joined by a conventionally known appropriate method such as heat fusion or sticking with an adhesive. Among the conventionally known joining methods, joining by a heat fusion press is preferable because both are easily integrated and excellent in joining strength, and excellent in productivity. The writing plate 10 manufactured as described above is the soft polyvinyl chloride sheet 1b.
Since the writing surface 2 which is an ultraviolet-cured coating film having excellent scratch resistance is formed on the writing surface 2, the writing surface 2 has excellent scratch resistance and writing properties, and exhibits a soft pen touch. Further, by interposing the soft polyvinyl chloride sheet 1b between the writing surface 2 and the hard polyvinyl chloride sheet 1a serving as the substrate, the softness of the pen touch is maintained and the formability and rigidity of the writing board are also maintained. it can. Further, as compared with a case where a plywood plate or a steel plate is used as the substrate and a soft polyvinyl chloride sheet having the writing surface 2 formed thereon is attached to this one surface, the weight is light, the productivity is high, and the cost is low.

The writing board 10 shown in FIG. 1 is a writing board in which the soft polyvinyl chloride sheet 1b is joined to only one surface of the hard polyvinyl chloride sheet 1a, but it is formed on both side surfaces of the hard polyvinyl chloride sheet 1a. You may join the soft polyvinyl chloride sheet 1b, respectively. By performing the writing surface forming step on both surfaces of the rigid polyvinyl chloride sheet 1a, the writing plate 20 as shown in FIG. 2 can be obtained.

The writing board 20 includes soft polyvinyl chloride sheets 1b and 1b 'on both sides of the rigid polyvinyl chloride sheet 1a.
And the writing surfaces 2 and 2'composed of an ultraviolet curable coating film are formed on the surface of the soft polyvinyl chloride sheets 1b and 1b 'which is not the surface to be joined to the hard polyvinyl chloride sheet 1a. In the production of the writing plate 20, the soft polyvinyl chloride sheets 1b and 1b ′ may be the same or different in type (content of plasticizer and thickness). The content of the plasticizer as well as soft polyvinyl chloride sheet 1b, 'by the use of different soft polyvinyl chloride sheet thickness of each of (t _2, t _4), and writing surface 2 writing surface 2' 1b Rockwell hardness of However, it is possible to obtain a writing plate having two types of writing surfaces with different pen touch soft feelings. In addition, each thickness (t ₃ ,
It is preferable that t ₅ ) be appropriately selected in the range of 10 to 20 μm so as not to impair the soft touch feeling of the pen touch. In addition, the writing surface forming process on both sides may be performed on each side, or may be performed on both sides simultaneously.

Like the writing board 20, a writing surface forming step is performed on both surfaces of a rigid polyvinyl chloride sheet, whereby a writing board having a writing area twice as large can be obtained, which is economical and compact and lightweight. be able to. Further, in the production method of the present invention, the soft polyvinyl chloride sheet 1b is joined to one side of the hard polyvinyl chloride sheet 1a, and the other side of the hard polyvinyl chloride sheet 1a is hardened by ultraviolet rays to be a hard writing surface. A coating film may be formed (hard writing surface forming step) to manufacture the writing plate 30 as shown in FIG. In the writing plate 30, 2 ″ is a hard writing surface formed on the surface of the hard polyvinyl chloride sheet 1a. In this case, either the writing surface forming step of forming the writing surface on the soft polyvinyl chloride sheet 1b or the hard writing surface forming step may be performed first, or may be performed simultaneously. The order of the writing surface forming step, the hard writing surface forming step, and the substrate forming step does not matter. The kind of the ultraviolet curable coating material used for the hard writing surface 2 ″ and the thickness (t ₆ ) of the coating film can be appropriately selected within the same range as the writing surface 2.

Like the writing plate 30, the writing surfaces 2 and 2 ″ having different hardnesses are formed on both sides of the hard polyvinyl chloride sheet 1a, so that the writing area is 2 like the writing plate 20.
In addition to being doubled in size and economical, the user can select either the soft writing surface 2 or the hard writing surface 2 ″ according to his or her favorite pen touch.

Further, in the joining in the substrate forming step of the manufacturing method of the present invention, the soft polyvinyl chloride sheet 1b is used.
The hard polyvinyl chloride sheet 1a and the hard polyvinyl chloride sheet 1a may be joined not only over the entire surface but also between them so as to form a gap into which the printed matter can be inserted and removed freely. The writing plate 40 shown in FIG. 4 is obtained by joining the rectangular rigid polyvinyl chloride sheet 1a and the soft polyvinyl chloride sheet 1b to each other in the substrate forming step at the edges of only three sides. Figure 4
Medium 5 is a joint portion between the soft polyvinyl chloride sheet 1b and the hard polyvinyl chloride sheet 1a. A space 6 is formed between the hard polyvinyl chloride sheet 1a and the soft polyvinyl chloride sheet 1b, and the remaining one side of the rectangular sheet that is not joined becomes the opening 7. Various printed matter can be inserted into the gap 6 through the opening 7, and a writing board having a wider range of application can be provided as compared with a conventional writing board on which a fixed pattern is printed. The writing board 40
In the above, it is preferable to use a transparent sheet as the soft polyvinyl chloride sheet 1b so that the inserted printed matter can be seen from the writing surface.

The writing plate 40 has a gap 6 into which a printed matter can be inserted.
However, a gap can be formed in the same manner in a writing board manufactured by joining the soft polyvinyl chloride sheet 1b to both side surfaces of the hard polyvinyl chloride sheet 1a. Writing board 50 shown in FIG.
Is formed by joining soft polyvinyl chloride sheets 1b and 1b 'to both sides of a rectangular rigid polyvinyl chloride sheet 1a on only three sides to form a rigid polyvinyl chloride sheet 1a, a soft polyvinyl chloride sheet 1b, and a rigid polyvinyl chloride sheet. Between the 1a and the soft polyvinyl chloride sheet 1b ', a gap 6,
6'is provided. As a result, two different types of printed matter can be appropriately selected, and the range of use as a writing board is further expanded. The openings 7, 7'may be formed on the same side or on different sides.

Furthermore, all of the above-mentioned manufacturing methods are methods in which the writing surface forming step, the substrate forming step, and, if necessary, the hard writing surface forming step are combined, but the manufacturing method of the present invention is the substrate manufacturing step. Prior to the above, a printing portion forming step of forming a printing portion on the joint surface between the soft polyvinyl chloride sheet 1b and the hard polyvinyl chloride sheet 1a may be included.
In the printed portion forming step, the printed portion may be formed on the joint surface of the hard polyvinyl chloride sheet 1a, or the printed portion may be formed on the joint surface of the soft polyvinyl chloride sheet 1b. Also,
The order of the writing surface forming step and the printing portion forming step is not particularly limited, but it is preferable to perform the writing surface forming step before the printing portion forming step for the following reason. That is, since the soft polyvinyl chloride sheet 1b is stretched to some extent by ultraviolet irradiation in the writing surface forming step, if the printing portion 3 is already formed on the joint surface with the soft polyvinyl chloride sheet 1b,
This is because the printing unit 3 may be deformed by the ultraviolet irradiation.

FIG. 6 shows a writing surface forming step, a substrate forming step,
A writing board 60 having a printing part manufactured by combining the printing part forming process and the printing part forming step is shown. The writing plate 60 includes a hard polyvinyl chloride sheet 1a and a soft polyvinyl chloride sheet 1b.
The printing unit 3 is provided on the joint surface with. In this case, the soft polyvinyl chloride sheet 1b can be used from the writing surface 2 to the printing portion 3
As can be seen, it is preferable to use a transparent soft polyvinyl chloride sheet, and a hard polyvinyl chloride sheet 1a
It is preferable to use a colored hard polyvinyl chloride sheet containing white.

Generally, when it is desired to provide the printing portion 3, other than the case where it is provided on the joint surface between the hard polyvinyl chloride sheet 1a and the soft polyvinyl chloride sheet 1b like the writing board 60,
Between the soft polyvinyl chloride sheet and the writing surface 2 (Fig. 7
(See (a)) and the writing surface 2 (see FIG. 7B). However, in the configuration of FIG. 7A, after the printing portion 3 is formed on the soft polyvinyl chloride sheet 1b, the ultraviolet curable coating material is applied and the ultraviolet rays are irradiated. Since the vinyl chloride sheet 1b is stretched to some extent by irradiation with ultraviolet rays, it is difficult to maintain straightness when the printing portion 3 is straight. Further, in the configuration of FIG. 7B, printing is directly performed on the surface of the ultraviolet curing coating film, the type of ink that can be used is limited due to the chemical stability of the ultraviolet curing coating film, and it becomes expensive, and The printing portion 3 becomes thin due to repeated writing and erasing, and finally disappears. On the other hand, in the structure of the writing plate 60, after the ultraviolet curing coating film is formed on one side surface of the soft polyvinyl chloride sheet 1b (writing surface forming step), the other side surface (hard polyvinyl chloride sheet 1a) of the soft polyvinyl chloride sheet 1b is formed. And a soft polyvinyl chloride sheet 1b on the hard polyvinyl chloride sheet 1a, and then a soft polyvinyl chloride sheet 1b and a hard polyvinyl chloride sheet on which a writing surface 2 is formed. Since it can be bonded to the substrate 1a (substrate forming step), it is not necessary to consider the deformation of the soft polyvinyl chloride sheet 1b and the wear of the printing portion 3. Therefore, according to the manufacturing method of the present invention, it is possible to obtain the writing plate 60 having the printing portion 3 which is durable and has no distortion or the like.

Also, in the method for manufacturing a writing plate in which the writing surfaces 2 are formed on both sides of the rigid polyvinyl chloride sheet 1a, the joining surfaces on both sides of the rigid polyvinyl chloride sheet 1a are
The printing unit 3 may be formed. The writing board 70 shown in FIG.
The printed portions 3 and 3'are provided on both surfaces of the white hard polyvinyl chloride sheet 1a, that is, on the respective joint surfaces with the soft polyvinyl chloride sheets 1b and 1b '. In this case, the patterns of the printing unit 3 and the printing unit 3'may be the same or different. Printing section 3 and printing section 3 '
By changing the printing patterns of and, a writing board having two types of patterns is obtained, and the applicable range is further expanded. It should be noted that only the printing portion 3 may be provided on the writing board having the writing surfaces 2 and 2'formed on both sides. In this case, the writing surface 2 side is used as a schedule board and the writing surface 2'side is used as a white board. be able to.

Next, the characteristics of one practical example of the writing board manufactured by the manufacturing method of the present invention will be described. Example: After applying a urethane acrylate-based paint to one side of a soft polyvinyl chloride sheet (thickness 0.5 mm) containing 45% by weight of a plasticizer, UV irradiation is applied for 30 seconds or longer to form a UV-curable coating that becomes a writing surface. A film (thickness 10 μm) was formed. Next, a hard polyvinyl chloride sheet (thickness 1.0 mm) containing no plasticizer was joined to the other side surface of the soft polyvinyl chloride sheet to manufacture the writing board 10 shown in FIG.

Conventional Example 1 A writing plate in which an aluminum plate is coated with enamel. The thickness of the enamel is about 40
μm. Conventional Example 2; A writing board obtained by sticking a polyester film (thickness: about 0.2 mm) to a veneer board.

Conventional Example 3 is a writing plate in which a writing surface is formed by applying a phenolic thermosetting coating material (thickness: about 20 μm) to a steel plate and curing it by heating. Comparative Example 1; a soft polyvinyl chloride sheet having no ultraviolet-cured coating film formed on its surface.

Comparative Example 2; a hard polyvinyl chloride sheet having no ultraviolet-cured coating film formed on its surface. Comparative Example 3; A hard polyvinyl chloride sheet containing 30% by weight of a plasticizer was used as a substrate, and an ultraviolet curable coating film was formed on this one side surface in the same manner as in Example. [Evaluation] Example, Comparative conventional example, and for each writing board of the comparative example, the Rockwell hardness of the writing surface (H R _R), scratch resistance, abrasion resistance, specular gloss, writing property, pen touch, and the price evaluated.

The Rockwell hardness of the writing surface (H _{R R)} is,
It was measured according to JIS K7202 (test room temperature 21
C, humidity 65%). Scratch resistance is ◎ (not hurt even with hardness 4H), ○ by pencil hardness scratch resistance test according to JIS K5400, and pencil hardness when scratched.
The evaluation was made in four grades (not damaged even with hardness 2H), Δ (not damaged with hardness F), and × (not damaged even with hardness B).

Abrasion resistance was measured according to ASTM-D-1044. The grindstone CS-10F is pressed with a load of 500 g, the test piece is rotated 100 times at a friction speed of 16 cm / sec, and the change in the haze value is visually observed for how the scratches occur.
3 (very little wear) to X (very bad wear)
The grade was evaluated. The specular glossiness was measured according to JIS K5400. In addition, in Comparative Examples 1 and 2, the measurement was performed in a state where a white hard polyvinyl chloride sheet corresponding to the first substrate of Example 1 was superposed on the back surface.

The writability was sensory-evaluated on the three levels of easiness of sliding of the pen when writing with a marking pen (good sliding of the pen) to x (bad sliding of the pen). With regard to pen touch, the soft feeling when writing with a marking pen was sensory-evaluated on a three-point scale of ◯ (around the pen is soft) to × (around the pen is hard).

The evaluation results are shown in Table 1. In Comparative Example 1, the writing surface was too soft to measure the Rockwell hardness. In addition, in the pen touch of Conventional Example 2, due to the poor sliding of the pen, the area around the pen was felt to be harder than the actual Rockwell hardness.

[0040]

[Table 1]

As can be seen from Table 1, Conventional Example 1 in which the writing surface is made of enamel and Conventional Example 3 in which the substrate is made of a steel plate are excellent in scratch resistance, writing ability, and abrasion resistance. However, due to its high Rockwell hardness, it is inferior in the soft feel of pen touch. Also, in terms of price, it is more expensive than the embodiment and other conventional examples. On the other hand, all of the plastic writing plates are satisfactory in terms of price, but the conventional example 2 and the comparative examples 1 and 2 in which the writing surface is not formed with the ultraviolet curable coating film have scratch resistance and abrasion resistance. , The writing was inferior. Further, Comparative Example 3 is satisfactory in scratch resistance, writing property, and abrasion resistance because the writing surface is formed of an ultraviolet curable coating film, but since the substrate is hard polyvinyl chloride, the Rockwell hardness is It became higher and the softness of the pen touch was inferior.

On the other hand, the writing plate according to the example can satisfy all of price, scratch resistance, abrasion resistance, writing property, and pen touch. Also, the mirror gloss was lower than that of enamel or polyvinyl chloride itself, and it was easy on the eyes.

[0043]

According to the method for producing a writing board of the present invention, since the substrate is formed of a polyvinyl chloride sheet, it is inexpensive, lightweight and easy to carry. Further, since the writing surface is formed of the ultraviolet curable coating film, it is possible to obtain a writing plate that is not easily scratched and has excellent abrasion resistance. Furthermore, since the writing surface is formed on the surface of the soft polyvinyl chloride sheet, it has the same writing properties as the enamel coating, and the indentation hardness is lower than that of the enamel etc., and the pen touch is soft and comprehensive. It is easier to write than writing plates made from enamel coating or steel plates. Furthermore, since the writing surface forming step and the substrate forming step can be continuously performed using a long sheet, the productivity is high.

Further, by performing the printing portion forming step,
It is possible to inexpensively provide a writing plate having a printing portion that is not distorted and has durability. Furthermore, a writing plate that allows the printed matter to be easily replaced as appropriate by joining the soft polyvinyl chloride sheet and the hard polyvinyl chloride sheet so that a gap into which the printed matter can be inserted and removed is formed. As a result, it is possible to expand the range of use compared to a writing plate having a fixed pattern, which is already provided with a printing section.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing the configuration of an example of a writing plate manufactured by a manufacturing method of the present invention.

FIG. 2 is a schematic cross-sectional view showing another configuration of the writing plate manufactured by the manufacturing method of the present invention.

FIG. 3 is a schematic sectional view showing an example of a writing plate obtained by a manufacturing method including a hard writing surface forming step.

FIG. 4 is a perspective view showing an example of a writing plate manufactured by bonding with a gap.

FIG. 5 is a perspective view showing another embodiment of a writing plate manufactured by bonding with a gap.

FIG. 6 is a schematic cross-sectional view showing an example of a writing plate obtained by a manufacturing method including a printing portion forming step.

FIG. 7 is a diagram for explaining the effect of the manufacturing method of the present invention.

FIG. 8 is a schematic cross-sectional view showing another embodiment of a writing plate obtained by a manufacturing method including a printing portion forming step.

[Explanation of symbols]

 1a Hard Polyvinyl Chloride Sheet 1b Soft Polyvinyl Chloride Sheet 1b 'Soft Polyvinyl Chloride Sheet 2 Writing Surface 2'Writing Surface 2' 'Hard Writing Surface 3 Printing Section 6 Gap

Claims (8)

[Claims] 1. A soft polyvinyl chloride sheet on one side,
Writing surface forming step of applying an ultraviolet curable resin coating material and irradiating the applied surface with ultraviolet rays to form a cured film to be a writing surface;
And a method of manufacturing a writing board, which comprises a substrate forming step of joining the other side surface of the soft polyvinyl chloride sheet and a hard polyvinyl chloride sheet. 2. The method for manufacturing a writing plate according to claim 1, wherein the substrate forming step is performed after the writing surface forming step. 3. The method for manufacturing a writing plate according to claim 1, wherein the writing surface forming step is performed after the substrate forming step. 4. The printing portion forming step of forming a printing portion on the joint surface between the soft polyvinyl chloride sheet and the hard polyvinyl chloride sheet is performed prior to the substrate forming step. A method for producing a writing board according to any one of 1. 5. In the step of forming the substrate, the soft polyvinyl chloride sheet is formed between the soft polyvinyl chloride sheet and the hard polyvinyl chloride sheet so as to form a gap into which a printed matter can be removably inserted. The method for producing a writing board according to claim 1, wherein the other side surface and the hard polyvinyl chloride sheet are joined together. 6. The soft polyvinyl chloride sheet,
A method for producing a writing board according to any one of claims 1 to 5, wherein a sheet having a thickness of 0.2 mm or more, which is made of soft polyvinyl chloride containing 20% by weight or more of a plasticizer, is used. 7. The soft polyvinyl chloride sheet,
A writing board according to any one of claims 1 to 5, wherein a sheet having a thickness of 0.4 to 1.0 mm, which is made of soft polyvinyl chloride containing 35% by weight or more of a plasticizer, is used. Production method. 8. The rigid polyvinyl chloride sheet,
8. A hard polyvinyl chloride sheet having an ultraviolet curable film, which is a hard writing surface, formed on the surface on the side where the soft polyvinyl chloride sheet is not joined is used. Manufacturing method of writing board.