JPH0717165A - Mail form - Google Patents

Abstract

PURPOSE:To provide a mail form enhanced in confidentiality protection by sealing an end part of a hiding fold-back piece with a strong adhesive layer and provided with easy opening for an addressee by forming a perforation line, a corner cutting, and a weak adhesive layer having a high releasability with respect to a secret post card which is mailed with confidential information hidden by the releasable weak adhesive. CONSTITUTION:In a mail form, a weak adhesive layer 12, a strong adhesive layer 13, and a printing area for confidential information X are provided on a bonding surface of a substrate consisting of a postal card-size paper sheet 1 and a fold-back piece 2 connecting to the paper sheet 1, and a corner cutting 4 and a perforation line 3 are provided in an end part of the fold-back piece.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mail form for use as a secret postcard having a peelable weak pressure-sensitive adhesive layer, and in particular, it cannot be peeled at the edge of the contact surface on which secret information is printed. The present invention relates to a mail form in which a strong adhesive layer, a corner cut for opening and a perforation are provided to improve confidentiality of confidential information and easy opening.

[0002]

2. Description of the Related Art In the past, notifications of payment of pensions and reminder letters of unpaid taxes were often notified by postcards, and there were many complaints that privacy could not be protected. For this reason,
For confidential information such as notifications from financial institutions and government agencies,
Envelopes were used. However, if the letter is sealed, there is a drawback that enclosing and sealing work is required, which is troublesome and the postage cost is high. Recently, folded the mail form into two or three folds to make it a postcard size, fill in the secret information inside it, stick the mail form closely and mail it as a postcard, and the recipient peels off the mail form. Secret postcards that can read confidential information when opened are authorized and partially implemented.

[0003]

However, since the secret postcard is adhered only by the weak adhesive layer capable of re-peeling the secret information printing portion, a third party other than the addressee damages the mail paper. Without doing so, the weak adhesive layer can be easily peeled off to view the secret information. In addition, these secret postcards have a drawback that the postcard-sized base material is required for two or three sheets and the cost becomes high. An object of the present invention is to provide a highly confidential mail form in which confidential information cannot be disclosed unless the recipient is delivered by cutting the strong adhesive portion of the postcard, which is composed of postcard-sized paper sheets and folded pieces and is of low cost. It provides a mail form.

[0004]

In order to solve the above-mentioned problems, the mail form according to the present invention is designed to be adhered to a base material composed of postcard-sized paper sheets and folded-back pieces continuously provided via folding lines. A weak pressure-sensitive adhesive layer that adheres by pressure is formed on almost the entire surface, a region for printing secret information is provided on the weak pressure-sensitive adhesive layer formation surface, and the folded piece is folded back along a folding line to face the opposite side. A mail form for adhering the weak adhesive layers to each other to conceal the secret information and then peeling the adhesive layer from the adhesive layer, the relative position of the edge of the folded piece and / or the facing sheet. In addition, a non-peelable strong pressure-sensitive adhesive layer that is adhered by pressure is provided, and a corner cut and a perforation are formed on the folded piece, and the perforation is cut from the corner cut portion to open the strong adhesion portion. Separate secret information sign It was configured to open the part.

[0005]

The present invention will be described in detail below with reference to the drawings and the like. FIG. 1 is a plan view of an embodiment of a mail form according to the present invention. 2 is a sectional view taken along line AA of FIG. FIG. 3 is a cross-sectional view showing an application example of the formation of the pressure-sensitive adhesive layer. FIG. 4 is a view showing a state in which the mail form of the embodiment is folded back and brought into close contact. FIG. 5 is a sectional view taken along line BB of FIG. As shown in FIGS. 1 and 2, the mail form of the present invention is usually a postcard (standard size postcard).
Size paper leaf 1 and postcard 2 about half the size of a postcard
And are continuously provided via a fold line p indicated by a one-dot chain line, and are used by folding back from the fold line p. Folded piece 2
When the sheet is folded back from the folding line p, the weak adhesive layer 12 is formed on the surfaces of the opposing sheet 1 and the folding piece 2 that are supposed to adhere, and the edge portion of the folding piece 2 and the relative position of the sheet 1 facing it are strengthened. The adhesive layer 13 is formed.

The strong pressure-sensitive adhesive layer 13 and the weak pressure-sensitive adhesive layer 12 are formed in the weak pressure-sensitive adhesive layer 1 as shown in FIG.
The strong adhesive layers 13 and 13 may be formed side by side. Further, in this embodiment, in order to increase the sealing strength, as shown in FIG. 2, the strong pressure-sensitive adhesive layer 13 was formed both at the end of the folded piece 2 and the relative position of the paper sheet 1 facing it. The agent layer 13 may be formed using either the folded piece 2 or the paper sheet 1. The weak adhesive layer 12 is also formed in this embodiment when the folded piece 2 is folded back from the folding line p and the opposite sheet 1
Although the weak pressure-sensitive adhesive layer 12 was formed on the planned contact surface of the folded piece 2 and the folded piece 2, the weak pressure-sensitive adhesive layer 12 may be formed on the entire surfaces of the folded piece 2 and the paper sheet 1, which may be easier in the manufacturing process. is there. The space for printing the secret information X is printed on the surface of the paper sheet 1 and the surface of the folding piece 2 which are hidden when the folding piece 2 is folded back from the folding line p, as shown in FIG. Figure 4
As shown in FIG. 5, printing was performed on the surface that was not concealed when the folded piece 2 was folded back from the folding line p, that is, the surface that was not hidden by the folded piece 2 of the paper sheet 1 in this embodiment. As the printing layer, printing may be performed on the weak pressure-sensitive adhesive layer, or the weak pressure-sensitive adhesive layer may be formed on the printing.

Next, the layer structure will be specifically described. The base material 11 is usually white fine paper,
If the surface is roughened by corona treatment or matte treatment, synthetic resin films such as PET, PE, PP and vinyl chloride can be used. Weak adhesive layer 12
The pressure-sensitive adhesive used for is adjusted so as to facilitate the adhesion and re-peeling of the adhered surface, and the adhesive main agent, the adhesion modifier, the additives, etc. described below are mixed in the following proportions. ing. Adhesive main agent 100 parts by weight Adhesion control agent In the case of needle-shaped substances 10-100 (preferably 10-50) parts by weight In the case of fine-grained substances 0-50 (preferably 5)
30) parts by weight When the above two substances are mixed 10 to 100 parts by weight Additive wax 0.01 to 20 parts by weight UV absorbers trace amount defoaming agent trace amount defoaming aid trace amount emulsifying component water 100 to 500 (preferably 200)
To 300) parts by weight emulsifier 0.5 to 2 parts by weight resin 1 to 50 parts by weight

[Adhesive Main Agent] The adhesive main agent is a natural rubber (N
R), esterified natural rubber, styrene butadiene rubber (SBR), chloroprene rubber, polyvinyl acetate, polymethylmethacrylate (PMMA) and the like, or a mixture thereof. In mixing these adhesive main agents, by appropriately adjusting the mixing ratio, the adhesiveness to the base material can be made higher than the adhesiveness while maintaining the self-adhesiveness between the pressure-sensitive adhesives. Preferably, a natural rubber having a high property of exhibiting self-adhesiveness between pressure-sensitive adhesives under pressure is added with polymethylmethacrylate or styrene-butadiene rubber for the purpose of enhancing the adhesiveness with a base material, that is, the anchor effect. Is mentioned. Polymethylmethacrylate is preferably used as a mixture with another adhesive main agent rather than used alone. As such an adhesive main agent, fine particles having a particle size of about 0.1 μm to 3 μm are usually used.

[Adhesive Strength Adjusting Agent] The adhesive strength adjusting agent is mixed to adjust the adhesive strength of the adhesive main agent, and a needle-like substance or a fine particulate substance or a mixture thereof is used. Needle-like substance As the needle-like substance, any of an inorganic substance and an organic substance may be used, as long as the shape thereof is substantially needle-like, flat, spiral,
Although it is arbitrarily selected from those having various forms such as scales, a needle-shaped substance is particularly preferable. The needle-shaped substance has an average length of 10 μm to 20 μm and an average diameter of 0.2.
It is preferably about μm to 0.5 μm. Needle-like substances
It is preferable that the pressure-sensitive adhesive be an emulsion and have an apparent specific gravity of 0.05 to 0.6 in order to reduce the sedimentation property when it is used as a coating agent. Further, in consideration of printing processing and NIP suitability, a needle-shaped substance Has an elastic modulus of 10000 kg / mm ²
It is preferably about 40,000 kg / mm ² . Examples of such needle-like substances include glass fiber, carbon fiber, P
AN-based fibers, metal crystals, metal compound crystals, and the like,
The adhesive main agent may be one that has no affinity (compatibility). A preferable acicular substance is a crystal of potassium 6-titanate (K ₂ O.6TiO ₂ ), which has no compatibility with water but has an affinity and has an apparent specific gravity of 0.2.
(True specific gravity = 3.3), elastic modulus 28,000 kg / mm ²
And is suitable as a pressure-sensitive adhesive component.

Fine particulate matter The fine particulate matter includes micro silica, synthetic zeolite, activated alumina gel, calcium carbonate, zinc oxide, titanium oxide, talc, clay, kaolin, activated clay, acrylic beads, starch, cellulose, silas balloon and the like. The particles having a particle size of 10 mμm to 30 μm, preferably 0.5 μm to 10 μm are suitable.
Further, by adding together with the needle-shaped substance, it is possible to reduce the addition amount of the fine-grained substance and prevent the fine-grained substance from falling off.

[Additives] As additives, waxes such as polyethylene wax and carnauba wax are added to improve handling properties, slipperiness such as NIP transport performance or blocking resistance, and ammonia is added to prevent deterioration. UV absorbers such as ethanolamine may be added. Further, as an antifoaming agent, a nonionic surfactant,
An anionic surfactant (mineral oil type) may be added, or silica or the like may be added as a defoaming aid.

[Emulsifying Component] The above-mentioned tackifying main agent, tackiness adjusting agent, and additives are dispersed in a medium such as water and applied to a substrate in an emulsion state. When emulsifying, an emulsifier is added if necessary. As the emulsifier, oleic acid soap, potassium castor oil soap, casein, glue, gelatin and the like can be used. Further, in order to prevent secondary aggregation of the adhesive main agent when emulsified, a resin having no affinity with the adhesive main agent can be added. As this resin, a water-dispersible polymer polyester,
Thermoplastic elastomer, low molecular weight polyethylene such as low density polyethylene, ionomer, vinyl acetate-olefin copolymer and the like can be preferably used.

The coating amount of such pressure sensitive adhesives, after drying ^{0.1g / m 2 ~10g / m 2} , preferably 1.0g
/ M ^{2 to} 3.0 g / m ² is preferable. Within this range, when printing or printing from the pressure-sensitive adhesive, the ink can penetrate through the pressure-sensitive adhesive and reach the substrate, and transfer of the printing layer when peeled off can be prevented. . Furthermore, blocking, piling (powder drop), etc. can be prevented, and sufficient adhesion and printability can be obtained.

The strong adhesive layer 13 contains NR as a main component,
Vinyl acetate, acrylic resin, (eg PMMA), S
The adhesive strength is increased by adding BR or the like. In this example, the components of the strong pressure-sensitive adhesive layer 13 were mixed and used in the following proportions. NR 20 to 30 parts Water 60 to 70 parts Micro silica 10 parts Vinyl acetate minute quantity PMMA minute quantity SBR minute quantity As a coating method for forming the weak adhesive layer 12 or the strong adhesive layer 13, a spray method or a gravure method is used. , Nozzle method, flexo method, etc. can be used.

Next, a method of using the mail form of the present invention will be described. The mail form of the present invention uses a printer such as NIP to display address and other public information such as address and name in the area where the address information W is written, and the maturity notification of the financial product in the area where the confidential information X is written. Print confidential information on one side at a time. Since the address information and the secret information can be printed on one side at a time, the printing speed is fast and the matching of both information is easy and reliable. When mailing this mail form, as shown in Figure 4 and Figure 5,
The folded piece 2 is folded back from the fold line p, and the weak adhesive layer 12 and the strong adhesive layer 13 on the opposite surfaces are entirely adhered to each other to conceal the secret information X for use. If the mail form of the present invention is mailed in this state, the postage will be treated as a postcard. When the recipient tries to open the mail form, the perforation 3 is cut from the corner cut 4 to separate the adhesive portion of the strong adhesive layer 13 and the weak adhesive layer 1
By delaminating the layer 2, it is possible to open the confidential information without damaging it.

The present invention is not limited to the embodiment described above, and various modifications can be made within the scope of the present invention. The size of the folded piece 2 can be arbitrarily selected, and the strong adhesive layer 13
Is not limited to a strip shape or a spot shape, and may be formed in one or more line shapes, may be formed continuously or discontinuously, and may have an arbitrary pattern shape. Strong adhesive layer 13
If the lines are discontinuous, it is possible to avoid a so-called blocking phenomenon, in which when the strong pressure-sensitive adhesive layers contact each other when stacked or folded, the weight of the mail foam adheres to each other. The mail form of the present invention is preferably a normal postcard whose size and weight when folded is determined by the Postal Law, but is not particularly limited in consideration of the usage form. The mail form may be continuous paper or single-cut paper when printing information, and the printer is not limited to NIP, and a dot impact printer or the like may be used. Information or the like that does not require confidentiality can be appropriately printed on this mail form.

[0017]

As described in detail above, according to the present invention, the processing machine and processing steps for the three-fold mail form for envelopes, which is widely used at present, can be used as it is. Further, in the present invention, the strong adhesive layer 13 is formed at the end of the portion to be cut by the perforation 3 of the folded piece, in addition to the weak adhesive layer 12, so that the tight adhesion can be ensured, and the sewing machine of the folded piece 2 can be opened. The confidentiality is high because the contact surface of the weak pressure-sensitive adhesive layer 12 cannot be opened unless the eye 3 is cut to separate the adhesive portion of the strong pressure-sensitive adhesive layer 13.

[0018]

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a mail form according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an application example of forming an adhesive layer of a mail form according to the present invention.

FIG. 4 is a diagram showing a state in which the example mail form of FIG. 1 is folded back and closely attached.

5 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

 1 Paper Leaf 2 Folding Piece 3 Perforation 4 Corner Cut 11 Base Material 12 Weak Adhesive Layer 13 Strong Adhesive Layer W Address Information X Confidential Information p Fold Line

Claims (2)

[Claims] 1. A weak pressure-sensitive adhesive layer that adheres by pressure to substantially the entire planned contact surface of a base material composed of postcard-sized paper sheets and folding pieces continuously provided in the longitudinal direction via folding lines. Form a region for printing secret information on the surface where the weak adhesive layer is formed, fold back the folding piece along a fold line, and closely contact the weak adhesive layers on opposite surfaces to each other to obtain the confidential information. A non-peelable non-peelable pressure-sensitive adhesive layer that is peeled from the pressure-sensitive adhesive layer after being concealed, the pressure-sensitive adhesive layer being adhered to the edge portion of the folded piece and / or the relative position of the facing sheet by pressure. A mail form characterized by having. 2. A corner cut and a perforation are formed in the vicinity of the edge of the folded piece, and the perforation is cut from the corner cut portion at the time of opening to separate the strong adhesive portion to open the secret information printing portion. The mail form according to claim 1, wherein: