JP3203467B2 - Display panel base plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base plate used when a display panel is prepared by pasting a photograph or a poster for display.

[0002]

2. Description of the Related Art Conventionally, an adhesive (also referred to as a "pressure-sensitive adhesive") is applied to the entire surface of a rigid foamed plastic plate or a veneer plate as a base plate for attaching photographs or posters for display. There is something. Of these, those using a rigid foamed plastic plate as a base material have been favorably used in recent years because of their light weight and ease of processing.

[0003]

By the way, an exhibition panel in which photographs and posters for exhibition are stuck on a base plate is used for exhibiting in photo exhibitions and contests, displaying large posters for advertisements and various event guides, and the like. Alternatively, it is used for personal hobbies such as inteliers, and it is required that pictures, posters, and the like be clearly attached. Therefore, when attaching a photo or poster to the base plate, it is necessary to take great care to prevent air from being trapped in the adhesive and to prevent misalignment due to poor positioning of the photo or poster. However, there was a problem that the sticking required skill.

[0004] In addition, immediately after the photo or poster is pasted on the base plate, it is inconspicuous, but after a while, the surface of the pasted photo or poster or the like generates blisters, that is, bubbles (blisters), and exhibits As a result, the aesthetics could be greatly impaired. The occurrence of this "blistering" is a phenomenon that is particularly common in large-sized photographs (photographic paper). Was strongly desired by photographers and poster creators.

[0005] Japanese Patent Publication No. 50-23706 discloses that the area of a surface paper (corresponding to "photographs, posters, etc." in the present specification) changes when left in a humid place or a dry place for a long time. Thus, there is described a problem that stretching stress is generated, and thus irregularities and wrinkles are generated on the surface. The invention of Japanese Patent Publication No. 50-23706 proposes to include a special crosslinking component in the pressure-sensitive adhesive in order to solve the above problems.

[0006] However, the term "swelling" as used in this specification
Is a foreign substance which cannot be solved by including a crosslinking component in the pressure-sensitive adhesive as described above.

The inventors of the present invention consider that the cause of the occurrence of "blistering" is that one or more of the following are combined.

The adhesive is sufficiently stirred before being attached to the base material, and it is supposed that fine air is carried into the adhesive and diffused during the stirring. Such fine air particles gradually separate from the adhesive and agglomerate into large particles, but are not discharged to the outside due to the high gas shielding property of high-grade art paper used for photographic printing papers and posters. Therefore, if there is a portion of the adhesive surface provided on the entire surface where the adhesive strength is weak, air gathers there and "bulges".

It is conceivable that the solvent or water used for dispersing the pressure-sensitive adhesive remains if the pressure-sensitive adhesive is not sufficiently dried after being applied to the substrate. Alternatively, it is conceivable that unreacted monomers and oligomers remain in the polymer which is the main component of the pressure-sensitive adhesive. These materials gradually evaporate, but are not discharged to the outside due to the high gas shielding property of high-grade art paper used for photographic paper and posters. Therefore, if there is a portion of the pressure-sensitive adhesive surface provided on the entire surface where the adhesive strength is weak, volatile components are gathered there and "bulging" occurs.

[0010] A foaming agent is used when molding a foamed plastic plate, and the foaming gas present in the cells gradually leaks out of the substrate. As in the above, if the high-grade art paper used for photographic printing paper or posters is not discharged to the outside due to the high gas shielding property, and if there is a weak adhesive part on the entire surface of the adhesive, Foaming gas collects, causing "bloating".

[0011] The air that is brought in when a photograph, a poster, or the like is attached to the base plate, gathers and generates "bulging".

The present inventors have confirmed that the gas contained in the "bulge" is analyzed by gas chromatography, and as a result, the gas component is rich in air, and suppose that the above is the main cause.

The present invention has been made in view of such conventional problems, and achieves the following objects.

(1) The present invention provides a base plate which does not generate blisters, that is, bubbles (blisters) on the surface of a photograph, a poster or the like attached to the base plate provided with the adhesive.

(2) To provide a base plate which can be attached to a base plate with less caution than before and without embracing air in an adhesive.

(3) To provide a base plate which can be more easily corrected than before in the case where misalignment occurs due to poor positioning of a photograph or a poster.

(4) Provided is a base plate in which the attached photograph, poster, or the like is stably adhered to the base plate for a long time, and does not peel off or wrinkle with the passage of time.

[0018]

For this purpose, according to the first aspect of the present invention, as shown in FIGS.
In the display panel base plate provided with the adhesive 2 on the surface of the above, the adhesive 2 is a permanent adhesive type adhesive,
Force is 0.3-2kg / 50mm, 1.5-4
kg / 50mm to ensure stability with adhesive strength
The ratio with the non-attached portion 3 is 30/70 to 70/30
In the range, the non-attached portion 3 is attached as a pattern leaving the non-attached portion 3, and each of the non-attached portions 3 serves as a display panel base plate communicating with the edge of the base material 1.

The present invention will be further described with reference to the drawings.

The substrate 1 is a veneer plate or a foamed plastic plate. Historically, veneer boards have been used for a long time, but hard foamed plastic boards are preferred because of their light weight and good workability.

As a foamed plastic plate, the thickness is 2 to
An extruded expanded polystyrene plate having a thickness of 30 mm and a density of 20 to 200 kg / m ³ is preferable. If the thickness is too thin, the rigidity of the base material tends to be insufficient, and if it is too thick, it is bulky, which is likely to cause inconvenience for display. On the other hand, if the density is too low, the rigidity of the base material tends to be insufficient, and if the density is too high, the weight increases and it is difficult to handle, and the material tends to be uneconomical.

It is preferable that the surface of the foamed plastic plate is as smooth as possible for displaying photographs and posters. An extruded polystyrene plate having a skin layer formed on the surface thereof, which satisfies such a requirement, preferably has a surface roughness of 0.5 mm or less obtained by an optical displacement sensor. More preferably, it is 0.2 mm or less. The skin layer is a smooth layer formed on the surface of the foamed plastic plate by extrusion foaming and having a higher density than the inside.

The above-mentioned optical displacement sensor irradiates light to the surface of the object to be measured and receives reflected light while moving at a constant speed while maintaining a constant distance from the surface of the object to be measured.
By utilizing the fact that the unevenness displacement of the surface of the object to be measured is proportional to the light reflectance, the surface roughness can be obtained from the reflectance of the light output to the recorder after being converted into an electric signal. is there.

The surface roughness of the extruded expanded polystyrene plate in the present invention is obtained as the difference between the upper and lower waves by reading the maximum value and the minimum value of the wave from the chart of the recorder by moving the optical displacement sensor in the width direction with respect to the extrusion direction. Value.

The pressure-sensitive adhesive 2 is of a permanent adhesive type, and has a strong adhesive strength to high-grade art paper used for photographic printing paper and posters, and has a higher layer breaking strength than photographic paper and high-grade art paper. However, such strong strength immediately after sticking makes it difficult to stick photos, posters, etc. to the base plate, so it is easy to re-stick at the very beginning. It is preferable that there is a property. That is, it is preferable that the adhesive force or the adhesive force be improved by gradually progressing the adhesion of the adhesive 2 to the back surface of the photographic paper or the high-grade art paper with the passage of time.

The specific compounding of the pressure-sensitive adhesive 2 is not particularly limited, but the pressure-sensitive adhesive 2 used in the present invention is preferably one mainly composed of an acrylate ester polymer. Can be used. In particular, in the present invention, since the pressure-sensitive adhesive 2 is attached as a pattern leaving the non-attached portion 3 as described later,
An adhesive having an initial adhesive strength of 0.3 to 1.2 kg / 50 mm can be easily obtained. In normal pasting work,
It can be easily peeled off at around 0.8 kg / 50 mm.
In addition, it is possible to improve the adhesive strength with the passage of time after attaching a photograph, a poster, or the like.
It is possible to prevent re-peeling stably with an adhesive strength of 0 mm. Such a state is referred to as permanent adhesion of the pressure-sensitive adhesive in this specification.

On the surface of the base plate, the adhesive 2
Is attached as a pattern that leaves That is, the adhesive 2 is not provided on the entire surface of the substrate 1, but the adhesive 2 and the non-applied portion 3 are present at a fixed ratio, so that the attached portion of the adhesive 2 is patterned. That is being done. Further, each non-attached portion 3 communicates with the edge of the base material 1 and forms a passage or area through which air or gas separated from the adhesive 2 escapes.

The ratio of the portion where the pressure-sensitive adhesive 2 is provided and the portion where the pressure-sensitive adhesive 2 is not provided depends on the pattern to be formed.
70/30 . Within such a range, the initial adhesive strength is relatively small, and when a shift occurs, it can be more easily corrected than before, and a strong adhesive strength can be reliably obtained with the passage of time. The pattern drawn by the pressure-sensitive adhesive 2 may be any pattern that does not generate the non-attached portion 3 surrounded by the portion where the pressure-sensitive adhesive 2 is attached. For example, many parallel lines, many oblique parallel lines, many points , A large number of independent cross lines, zigzag lines, a group of broken lines, and the like, but it is preferable that the adhesive 2 is arranged as evenly as possible over the entire surface of the substrate 1.

The ease with which the adhesive 2 can be applied and the stuck photos and posters are stably adhered to the base plate for a long time, and as a pattern hard to be peeled off from the edges and wrinkled over time. Is preferably a large number of parallel lines, but is not limited to this pattern. In the case of a parallel line, the line width ratio between the portion where the adhesive 2 is provided and the portion 3 where the adhesive 2 is not provided is about 1: 1.
The width of the adhesive 2 is preferably 0.5 to 2.0 mm, and more preferably about 1.0 mm.

When a plastic foam plate is used as the base material 1, it is often charged with static electricity when left unattended, and when this adsorbs dust in the air, the back surface or end surface of the base plate becomes black and dirty. To prevent this, an antistatic agent (often having a surfactant as a main component) is applied to the back surface of the base plate, that is, the surface and the end surface opposite to the surface on which the adhesive 2 is provided. Is preferred.

The application of the pressure-sensitive adhesive 2 to the substrate 1 can be performed by applying it to the substrate 1 by a gravure roll type rotary coating machine or a roll coater. The application pattern of the adhesive 2 is grooved on the roll, and the adhesive 2 is scraped off from the roll surface to leave the adhesive 2 only in the groove. The adhesive 2 can be provided in a pattern.

In FIG. 1, reference numeral 4 denotes release paper.

[0033]

When a photograph, a poster or the like is stuck on the surface of the base plate, the adhesive 2 is provided on the surface of the base plate as a pattern leaving the non-attached portion 3, and each non-attached portion 3 is attached to the base material 1. , The non-attached portion 3 serves as an air passage, and the entrapped air is discharged to the outside without stagnation.

Although the position of a photograph, a poster, or the like may be shifted with respect to the base plate, the initial adhesive force of the adhesive 2 having the above-mentioned pattern is weak, so that it is easy to correct this. That is, since the adhesive 2 is not provided on the entire surface of the base material 1 but the attached portion of the adhesive 2 and the non-attached portion 3 are present at a fixed ratio, the very early bonding of the base plate The force is relatively weak and has removability.

However, the adhesion of the pressure-sensitive adhesive 2 gradually progresses over time to the back surface of the photographic paper or the high-grade art paper as the adherend, and the adhesive force or the adhesive force is improved. As a result, permanent adhesion between the base plate and the adherend is realized.

As time passes, the fine air particles gradually separate from the adhesive and condense into large particles. Alternatively, the residual solvent, unreacted monomer, and foaming gas gradually undergo volatilization and separation from the adhesive. Non-attached part 3 of adhesive 2
Is an area where air or gas separated from the adhesive escapes. Each non-attached portion 3 communicating with the edge of the substrate 1
It serves as a passage for releasing air or gas separated from the adhesive 2 to the outside of the base plate.

The photographic printing paper or poster art paper to be adhered is a chrysanthemum (636 × 639) or a 46 (6).
88 × 1091) can be used.

By the way, for example, Japanese Utility Model Publication No. 47-35863
The publication states that a photo preservation album is described as follows: "A pressure-sensitive adhesive is applied to the surface of a thick substrate, and the upper surface of the plate is peelably covered with a transparent film. In this example, a "plate for storing photographs and the like, characterized in that the agent is provided in oblique lines", is shown.

However, it is essential that the adhesive used for such a photo preservation album has removability. That is, it is required as a basic characteristic that the adhesive force or the adhesive force of the pressure-sensitive adhesive to the transparent film is smaller than the cohesive force of the pressure-sensitive adhesive itself for a long time. Furthermore, the adhesive or adhesive strength of the removable adhesive must not be greater than the layer breaking strength of the photographic paper to be stored. This re-peelability is an essential requirement for repeatedly attaching and detaching the transparent film to and from the album mount.

In the above-mentioned publication, the reason why the pressure-sensitive adhesive is provided in a linear shape is mainly to facilitate peeling of the transparent film. Others, 1-89
Also in Japanese Patent Publication No. 176, the first object is to make it easy to repeatedly peel the transparent film in the photo album. It is important for the removable adhesive to maintain weak adhesiveness for a long period of time.

On the other hand, the pressure-sensitive adhesive used in the present invention is of a permanent adhesive type, and is not for repeatedly sticking or peeling a photographic paper or a poster. The permanent adhesive type adhesive has a strong adhesive strength to high-grade art paper used for photographic printing paper and posters, and this adhesive strength is usually stronger than the layer breaking strength of photographic paper and high-grade art paper.

From the above, the technique used for the album for storing photographs is basically different from the present invention in the purpose and the problem to be solved, and also in the function.

[0043]

【Example】

Example 1 An extruded polystyrene foam plate having a thickness of 7 mm and a density of about 100 kg / m ² was used as a substrate 1 to prepare a base plate as shown in FIGS. 1 and 2. As the pressure-sensitive adhesive 2, an acrylic emulsion type pressure-sensitive adhesive was used and provided in a number of parallel linear patterns. The width of the adhesive 2 was 1 mm, the ratio of the width of the adhesive 2 to the width of the non-attached portion 3 was 1: 1 and the amount of the adhesive 2 applied was about 25 g / m ² (dry).

When the initial adhesive strength and the final adhesive strength of the obtained base plate to the following photographic paper were measured, they were about 0.8 kg / 50 mm and 1.5 to 4 kg / 50 mm, respectively.

As an adherend, 760 × 1080 m
m (B all sizes) (Photo paper: Fuji Bromide WP
FM3) and Western paper (art paper: 100 g / m ² )
The workability of pasting and the stability when exhibited after pasting were investigated.

Table 1 shows the results.

Example 2 A base plate was prepared in the same manner as in Example 1 except that the adhesive ² was provided at about 20 g / m ² (dry) as a number of spot-like patterns.

When the initial adhesive strength and the final adhesive strength of the obtained base plate were measured, each was about 0.5 kg / 50 mm.
And 1.5 to 2 kg / 50 mm.

Further, using the same adherend as in Example 1, and under the same environment as in Example 1, the workability of sticking and the stability of the display after sticking were examined.

Table 1 shows the results.

Comparative Example 1 A base plate was prepared in the same manner as in Example 1 except that the pressure-sensitive adhesive ² was provided at about 40 g / m ² (dry) on one entire surface of the substrate 1.

When the initial adhesive strength of the obtained base plate was measured, it was about 4 to 5 kg / 50 mm.

Further, using the same adherend as in Example 1, and under the same environment as in Example 1, the workability of sticking and the stability of the display after sticking were examined.

Table 1 shows the results.

Comparative Example 2 A base plate was prepared in the same manner as in Example 1 except that an acrylic rubber-based solvent type adhesive 2 was applied at about 30 g / m ² (dry) on one entire surface of the substrate 1. .

When the initial adhesive strength of the obtained base plate was measured, it was about 5 to 6 kg / 50 mm.

Further, using the same adherend as in Example 1, and under the same environment as in Example 1, the workability of pasting and the stability of the display after pasting were examined.

Table 1 shows the results.

[0059]

[Table 1]

[0060]

The present invention is as described above, and has the following effects.

(1) Since the occurrence of “bulging” on the surface of a photograph, a poster or the like attached to the base plate is drastically reduced, even an expensive photograph or the like can be attached with confidence.

(2) In the work of attaching to the base plate, a photograph, a poster, etc. can be attached with less caution than in the past so as not to embrace air, and a high level of skill is not required. Easy to handle.

(3) Even if a misalignment occurs due to a poor positioning of a photograph, a poster, or the like, the misalignment can be more easily corrected than before, and failures can be reduced.

(4) The stuck photos, posters, etc. are stably adhered to the base plate for a long time, and do not peel or wrinkle with the passage of time, and also reduce the overall warpage. Can be.

(5) Since the expansion and contraction stress caused by the change in temperature and humidity is evenly diffused, unevenness generated on the surface of a photograph, a poster or the like is not seen. Therefore, it is not necessary to use a special crosslinking agent as described in the prior art.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a base plate according to the present invention.

FIG. 2 is a partially enlarged view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base material 2 Adhesive 3 Non-attached part 4 Release paper

Continuation of the front page (72) Inventor Hideo Ogura 2-2-224 Higashishinagawa, Shinagawa-ku, Tokyo Dow Chemical Co., Ltd. (56) References JP-U 1-15273 (JP, U) JP-U 63- 31976 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B32B 1/00-35/00 G09F 7/00-7/22 G09F 15/00 B42F 5/00-5/06

Claims (5)

(57) [Claims] 1. A display panel base plate in which an adhesive is provided on the surface of a plate-shaped substrate, wherein the adhesive is a permanent adhesive type adhesive.
And the initial adhesive strength is 0.3 to 2 kg / 50 mm,
Stabilizes over time with an adhesive strength of 1.5 to 4 kg / 50 mm
So that the ratio between the attached portion and the non-attached portion is 30 / 70-
A base plate for an exhibition panel, wherein a non-attached portion is provided as a pattern in a range of 70/30 , and each non-attached portion communicates with an edge of a base material. 2. The display panel base plate according to claim 1, wherein the base material is a foamed plastic plate. 3. The display panel base plate according to claim 1, wherein the pattern made of the adhesive is constituted by lines or dots. 4. The foamed plastic plate is an extruded foamed polystyrene plate having a skin layer formed on the surface, and the surface roughness measured by an optical displacement sensor is 0.5 mm or less. Display panel base plate. 5. The display panel base plate according to claim 2, wherein an antistatic agent is applied to a back surface of the foamed plastic plate.