JP2010142993A - Concealing postcard sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a concealing postcard sheet which can be folded in three folds in a rolling manner and also has a function for detecting the opening of the concealed postcard paper piece. <P>SOLUTION: A rectangle sheet is divided into three areas along the two border lines 11, 12 horizontal to its narrow sides, respectively, a concealing paper piece 4 positioned in the center, a first postcard piece 5 and a second postcard paper piece 6 connected to the sides of the concealing paper piece 4. Furthermore, a removable adhesive layer 22 is formed on one surface of the concealing paper piece 4, and sealing portions 7, 8 with strong adhesive layers 24 are formed at outer edges of the first postcard piece 5 and the second postcard piece 6 via fold lines 15, 16, forming a pair of the cutting lines 13, 14 horizontal to the border lines 11, 12 at the inner side thereof. In addition, the width L2 of the first postcard piece 5 and the width L3 of the second postcard piece 6 are set shorter than the width L1 of the concealing paper piece 4, and also the width W1 extending from the cutting line 14 to the border line 11 is set shorter than the width W3 extending from the folding line 15 to the border line 11. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a concealed postcard sheet for mailing the information entered on the communication side of a postcard in a concealed state.

  Conventionally, when personal information is filled in and mailed, such as an account transfer request form or a credit card payment application form, a concealment postcard is used to mail the personal information concealed (for example, (See Patent Document 1 below). As shown in FIG. 11, the concealed postcard sheet of Patent Document 1 has a concealed paper piece coated with a re-peeling paste arranged in the center, and folds and cuts perforated on both sides of the concealed paper piece. This is a specification in which two types of application forms are provided on one sheet. When using this concealed postcard sheet, one of the two types of application forms is selected and necessary information is entered, and the unnecessary application form is folded and cut off at the perforation. Thereafter, as shown in FIG. 11 (b), the concealment paper piece and the postcard paper piece are folded and bonded and mailed.

  However, according to the concealment postcard sheet of Patent Document 1, it is possible to peel off the concealment paper piece and paste it back as it is even after pasting the concealment paper piece on the postcard paper piece. There is a problem that you can not. In addition, this concealed postcard sheet is provided with a postal display portion composed of characters such as “postcard”, and the width of the central concealed paper piece and the two postal display portions on both sides thereof is the width of the postcard pieces on both sides. Longer than. Because of this, the paper widths of the three paper pieces are different, so be careful that the edges of the paper pieces do not align when the concealed postcard sheet is folded in three as shown in FIG. 11 (c), and the sheet does not bend at other parts than the perforations. There is a need to. In addition, since the maximum width of postcards (private postcards) is stipulated in the postal law as 107 mm, the provision of a postal display section makes the width of the information field of the postcard paper pieces concealed by the concealment paper pieces shorter than 107 mm. .

  On the other hand, as shown in FIG. 12, a concealed postcard sheet having a specification provided with a sealing portion is also conceivable. This concealed postcard sheet has a concealed paper piece coated with re-peeling glue placed in the center, folded and cut on both sides of the concealed paper piece, arranged side by side through perforations, and a strong adhesive on the outer edge of the postcard paper piece. The applied sealing part is provided through the fold perforation. When using this concealed postcard sheet, one of the two types of application forms is selected and necessary information is entered, and the unnecessary application form is folded and cut off at the perforation. After that, as shown in FIG. 12B, the concealment paper piece folded at the folding and cutting perforation is pasted onto the postcard paper piece, and finally the sealing part is folded at the perforation perforation and bonded.

  In this way, according to the concealed postcard sheet provided with the sealing portion, by using a strong adhesive in the sealing portion, the folding perforation between the sealing portion and the postcard paper piece is broken at the time of opening and has an opening detection function. Moreover, the width of the information column of the postcard paper piece concealed by the concealment paper piece can be secured up to the maximum width of 107 mm. However, in the case of this structure, both ends of the postcard paper piece must be set longer by the amount corresponding to the sealing portion, and the width of both postcard paper pieces becomes longer than the width of the central concealment paper piece. For this reason, since the paper widths of the three paper pieces are different, when the concealed postcard sheet is folded as shown in FIG. 12C, the end of the postcard paper piece jumps out from the end of the concealed paper piece, and the winding cannot be folded in three. There is a problem.

JP 2005-186498 A

  The present invention has been made to solve the above-described problems, and the object of the present invention is to provide a concealed postcard that can be folded in three and has a function for detecting the opening of a concealed postcard paper piece. To provide a sheet.

  In order to achieve the above object, the present invention divides a rectangular sheet into three regions by two boundary lines parallel to the short side thereof, a concealing paper piece is arranged at the center, and concealing paper pieces on both sides of the concealing paper piece. Is a concealed postcard sheet in which short postcard paper pieces are concatenated, having a releasable adhesive layer on one side of the concealed paper piece, and a sealing portion having a strong adhesive layer on the outer edge of the postcard paper piece provided via a fold line A set of cut lines parallel to the boundary line is formed inside the boundary line, and the width from the cut line on one side of the masking paper piece to the boundary line on the other side is from the fold line to the boundary line of the postcard paper piece. It is characterized by being set shorter than the width.

  When using the concealed postcard sheet of the present invention, first, information is entered in one of the postcard paper pieces, and the other postcard paper piece is cut off by a cutting line and separated from the concealed postcard sheet. Next, the masking paper piece is folded at the boundary line and pasted on the postcard paper piece through the adhesive layer. Finally, the sealing part is folded back at the fold line, and is adhered and sealed on the cover paper piece through the strong adhesive layer. Thereby, the information entered on the postcard paper piece can be mailed as a concealed postcard concealed. Further, at the time of opening, the boundary line of the concealed postcard is cut and the concealed paper piece is peeled off, whereby the information entered on the postcard paper piece can be confirmed.

  Further, in the concealed postcard sheet having the above configuration, when the width from the fold line to the boundary line in the postcard paper piece is set to the maximum value of the short side of the postcard, the area of the postcard paper piece that can be concealed is maximized. be able to.

  Further, in the concealed postcard sheet having the above-described configuration, the rectangular sheet may have a two-layer structure in which two sheets are bonded together. In this case, it is preferable that the communication side paper for at least the postcard paper piece is a pressure-sensitive copying paper because the information entered on the pressure-sensitive copying paper can be stored as a copy.

  According to the present invention, the width of the postcard paper piece is set shorter than the width of the masking paper piece, and when the masking postcard sheet is folded along the boundary line, the end of the postcard paper piece is aligned inside the edge of the masking paper piece, It can be neatly folded in three. Also, after creating the concealment postcard, if the concealment paper piece is peeled off, there will be a trace of the boundary line cut, so if you see the cut marks remaining on the postcard paper piece or the concealment paper piece, you can determine whether it was opened during mailing .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

------ Composition of concealment postcard sheet --------------------------------------- -----------
FIG. 1 is an external view of a concealed postcard sheet 1 according to the present invention as viewed from the front side. As shown in FIG. 1, the concealed postcard sheet 1 of the present embodiment is one in which two postcards are integrated, and the information entered on the communication surface of one of the postcards can be concealed and mailed. The whole is composed of a rectangular sheet. This rectangular sheet has a two-layer structure in which two sheets of the same size (upper sheet 2 and lower sheet 3) are stacked and bonded together. The upper sheet 2 and the lower sheet 3 of this embodiment are two sheets. Each piece uses high-quality paper with a continuous weight of 110 kg so as to satisfy 2 g or more of the specified continuous weight of the postcard body.

  A rectangular sheet composed of an upper paper 2 and a lower paper 3 is divided into three regions by two boundary lines 11 and 12 parallel to the short side. The boundary lines 11 and 12 are folding and opening lines so that the rectangular sheet can be folded or opened. In this embodiment, the boundary lines 11 and 12 are formed by opening perforations in which substantially L-shaped cut portions are continuously formed. Has been. A concealing paper piece 4 is arranged in the center of the three divided rectangular sheets, and two kinds of postcard paper pieces 5 and 6 are connected to both sides of the concealing paper piece 4 via boundary lines 11 and 12. In the following description, for the sake of convenience, the postcard paper piece 5 adjacent to the right side of the masking paper piece 4 when the rectangular sheet is viewed from the front side is referred to as “first postcard paper piece”, and the postcard paper piece 6 adjacent to the left side of the masking paper piece 4 It is called “second postcard piece”.

  The masking paper piece 4 is provided with a masking layer 21 on the front side of a rectangular sheet. The concealing layer 21 is configured by printing the entire surface of the upper paper 2 with a dark printing ink such as black, silver, or amber as a permeation preventing process, or performing partial printing such as a background pattern. A set of cut lines 13 and 14 parallel to the boundary lines are formed on the masking paper piece 4 inside the boundary lines 11 and 12. The cut lines 13 and 14 are cut so that the first postcard paper piece 5 or the second postcard paper piece 6 can be separated from the rectangular sheet. In this embodiment, the pitch between the cut portion and the tie portion is set finely. It consists of micro perforations.

  In the first postcard piece 5, the surface of the upper paper 2 is the address of the postcard body. On the address side, a postal display portion 32 composed of characters “postcard” indicating the postcard body, a charge stamp surface 33 indicating that the postage has been paid, a recipient address 34, a financial institution The contract 35 to be addressed is printed and displayed in advance. Further, in the second postcard paper piece 6, the surface of the upper paper 2 is the address face of the postcard body. Similar to the first postcard piece 5, the mail display portion 32, the fee stamp surface 33, and the destination 34 are printed and displayed in advance on the address surface. Note that the rectangular sheet is formed by stacking and bonding two high-quality papers, so that a paper jam due to a step does not occur, and a good printing process is possible.

  FIG. 2 is an external view of the concealed postcard sheet 1 as viewed from the back side. As shown in FIG. 2, two types of application forms are provided on both sides of the concealment piece 4 on the back side of the concealment postcard sheet 1. In the present embodiment, an example is shown in which the application is applied to an application form in which the user selects and applies an account transfer or credit card payment method for the electricity bill.

  The usage method 31 is displayed on the back surface of the lower paper 3 on the masking paper piece 4. In this embodiment, an application form entry method and an entry example are printed in advance as a display example. In the masking paper piece 4, corner cuts 17, 17 are formed at the start positions of the boundary lines 11, 12 by cutting off the ends of the opening perforations into a triangle.

  In the first postcard paper piece 5, the back surface of the lower paper 3 is the communication surface of the postcard body. On this communication side, an account transfer request form is provided. Specifically, an information entry column 36 for entering a contract number and a place where electricity is used, and an information entry column 37 for entering an applicant's designated financial institution and account number. Is printed. Further, a sealing portion 7 is provided on the outer edge of the first postcard paper piece 5 via a fold line 15. The fold line 15 is press-worked so that the sealing part 7 can be easily folded, and is composed of micro perforations in which the pitch between the cut part and the tie part is set finely.

  In the second postcard piece 6, the back surface of the lower paper 3 is the communication surface of the postcard body. A credit card payment application form is provided on this communication side. Specifically, an information entry field 38 for filling in the credit card number and expiration date of the applicant, and an information entry field for entering the contract number and the place where electricity is used. 39 is printed. Similarly to the first postcard paper piece 5, a sealing portion 8 is provided on the outer edge of the second postcard paper piece 6 via a fold line 16 printed with micro perforations.

  Here, as shown in FIG. 1, the masking paper piece 4, the first postcard paper piece 5, and the second postcard paper piece 6 are designed to have a size satisfying both the following conditions 1 and 2 respectively.

(Condition 1) L1> L2 (L3) so that the winding can be folded in three. If the three pieces of paper are strictly divided into three equal parts, it is difficult to fold when the winding is folded in three. Therefore, it is necessary to set the width L2 of the first postcard paper piece 5 and the width L3 of the second postcard paper piece 6 to be about several mm shorter than the width L1 of the masking paper piece 4, respectively. In this embodiment, L1 = 115 mm, L2 = 114 mm, and L3 = 114 mm are set.

(Condition 2) W3> W1 (W4> W2) so that it can be folded and sealed. When one of the first and second postcard pieces 5 and 6 is cut off, the width and concealment of the remaining postcard pieces If the widths of the paper pieces 4 are equal, the paper does not fold well at the fold line 15 (16), and it becomes difficult to fold and seal. Therefore, it is necessary to set the width W1 from the cut line 14 to the boundary line 11 in the masking paper piece 4 shorter than the width W3 from the folding line 15 to the boundary line 11 in the adjacent first postcard paper piece 5 by about several mm. Similarly, it is necessary to set the width W2 from the cut line 13 to the boundary line 12 shorter than the width W4 from the folding line 16 to the boundary line 12 by about several mm. In the present embodiment, W1 = 103 mm, W2 = 103 mm, W3 = 104 mm, and W4 = 104 mm are set.

  In consideration of satisfying the above conditions 1 and 2, the width W5 of the sealing part 7 (or the width W7 of the sealing part 8) and the width W6 from the boundary line 11 to the cut line 13 (or from the boundary line 12) The width W8) up to the cut line 14 also varies accordingly. In this embodiment, W5 = 10 mm, W6 = 12 mm, W7 = 10 mm, and W8 = 12 mm are set.

  If W3 and W4 are set to 107 mm which is the maximum value of the short side of a postcard (private postcard), the area that can be concealed for the first postcard piece 5 and the second postcard piece 6 can be secured to the maximum. . In this embodiment, W3 and W4 are set to 104 mm because the workability when putting the concealed postcard sheet 1 folded in three into a regular envelope is taken into consideration. That is, when W3 and W4 are set to 107 mm, if the width W5 of the sealing part 7 (or the width W7 of the sealing part 8) is 10 mm, L1 becomes 118 mm and it is difficult to put it in a standard envelope (width 120 mm). become. Therefore, in this embodiment, L1 is set to 115 mm in order to provide a margin, and W3 and W4 are set to 114 mm shorter than that.

  FIG. 3 is a cross-sectional view of the concealed postcard sheet 1. The interlayer structure of the concealment postcard sheet 1 is as shown in FIG. 3, and in the portion corresponding to the central concealment paper piece 4, the back surface of the upper paper 2 is provided with an adhesive layer 22 coated with an adhesive, opposite to this. A release layer 23 in which a silicone release agent is applied to the surface of the lower paper 3 is provided. Thereby, in the masking paper piece 4, the upper paper 2 and the lower paper 3 are bonded to each other through the boundary surface between the adhesive layer 22 and the release layer 23 so as to be peeled off. For the pressure-sensitive adhesive, a re-peeling adhesive made of, for example, an acrylate copolymer can be used, and the adhesive strength is such that it can be re-peeled to the postcard paper pieces 5 and 6 and the adhesive does not remain on the paper surface after peeling. As a specific standard, it may be set to be less than 300 gf / 25 mm (180 ° peeling method according to JIS Z0237). In addition, the adhesive is not applied to the peripheral portions of the boundary lines 11 and 12 and the cut lines 13 and 14 in consideration of ease of cutting.

  A portion corresponding to the first postcard piece 5 and the second postcard piece 6 is provided with a strong adhesive layer 24 coated with a strong adhesive on the back surface of the upper paper 2. The paper 3 is completely bonded so as not to be peeled off. In addition, in the portion corresponding to the sealing portions 7 and 8 on the outer edge, a strong adhesive layer 24 in which a strong adhesive is similarly applied is provided on the back surface of the upper paper 2, and a silicone-based peeling is applied to the surface of the lower paper 3 facing this. A release layer 25 coated with an agent is provided. Thereby, in the sealing parts 7 and 8, the upper paper 2 and the lower paper 3 are adhere | attached so that peeling is possible via the interface of the strong adhesion layer 24 and the peeling layer 25. FIG. For example, an acrylic emulsion-type pressure-sensitive adhesive can be used as the strong adhesive, and the adhesive strength is such that it adheres to the masking paper piece 4 so that it cannot be peeled again, and when it is peeled off, the paper breaks on the paper surface. As a reference, it is necessary to set it to 300 gf / 25 mm (same as above) or more. Note that a strong adhesive is not applied to the peripheral portions of the folding lines 15 and 16 in consideration of easy folding.

------ Usage of concealment postcard sheet -------------------------------------- --------
The concealed postcard sheet 1 of the present invention is configured as described above, and the method for using the same will be described below. As shown in FIG. 4, according to this concealed postcard sheet 1, the short side of the rectangular sheet is divided into three by two boundary lines 11 and 12, and the width L2 of the first postcard paper piece 5 and the second postcard paper piece The width L3 of 6 is set slightly shorter than the width L1 of the masking paper piece 4. For this reason, when the concealed postcard sheet 1 is folded at the opening perforations of the boundary lines 11 and 12 as shown in the figure, the end of the first postcard paper piece 5 and the end of the second postcard paper piece 6 are respectively inside the edge of the concealment paper piece 4. So that you can fold it in three beautifully without bending in the middle. Therefore, when the trader sends the application form to the user, the concealed postcard sheet 1 folded in three can be put in a fixed envelope and mailed.

  On the other hand, as shown in FIG. 5, the user fills in the necessary items on the application form while referring to the usage method displayed on the masking paper piece 4 and returns it. For example, if you want to transfer the electricity bill to direct debit, in the information entry fields 36 and 37 of the first postcard piece (direct debit request form) 5, in addition to the contract number, the address of the holder, your name, contact information, Enter the designated financial institution and account number, and seal the report to the financial institution. When all necessary items have been entered, the application form that is no longer needed is separated from the concealed postcard sheet 1. Here, since the second postcard paper piece (credit card payment application form) 6 is unnecessary, the second postcard paper piece 6 is removed from the second postcard paper piece 6 by cutting the cut line 14 between the concealing paper piece 4 and the second postcard paper piece 6. Separate from 1.

  Next, create a concealment postcard and mail it. As shown in FIG. 6, when the corner cut 17 at the end of the masking paper piece 4 is picked and peeled off, the lower paper 3 of the masking paper piece 4 is peeled off from the masking postcard sheet 1, and is placed on the back surface of the upper paper 2 of the masking paper piece 4. The applied adhesive layer 22 appears.

  Then, as shown in FIG. 7, when the boundary line 11 is folded in a valley fold, the masking paper piece 4 is pasted on the first postcard paper piece 5 by the adhesive layer 22 on the back surface of the upper paper 2, and information on the first postcard paper piece 5 The information entered in the entry fields 36 and 37 is concealed by the concealment paper piece 4. Further, when the sealing portion 7 provided on the outer edge of the first postcard paper piece 5 is peeled off, the lower paper 3 of the sealing portion 7 is peeled from the concealed postcard sheet 1 through the folding line 15, and the upper paper 2 of the sealing portion 7. A strong adhesive layer 24 applied on the back surface appears. When the micro perforation of the fold line 15 is turned back, the sealing portion 7 is adhered and sealed to the masking paper piece 4 by the strong adhesive layer 24 on the back surface of the upper paper 2. Thereby, the concealment postcard 9 in which the information entry fields 36 and 37 of the first postcard piece 5 are covered with the concealment piece 4 is completed, and can be mailed with the personal information protected.

  Finally, the trader who has received the mailed concealment postcard 9 opens the concealment postcard 9. As shown in FIG. 8, a corner cut 17 is provided at the end of the masking paper piece 4, and when the corner cut 17 is picked and peeled off, the opening perforation of the boundary line 11 connected thereto is cut, The masking paper piece 4 is peeled off from the first postcard paper piece 5 and opened. Here, since the masking paper piece 4 and the first postcard paper piece 5 are bonded together through a releasable adhesive layer 22, the masking paper piece 4 can be peeled off with a light force when opened, and the first postcard paper piece No glue remains on the paper surface of No. 5. By opening the concealment postcard 9 in this way, the concealed surface of the first postcard paper piece 5 appears, and the necessary items entered in the information entry fields 36 and 37 can be confirmed. Further, when the masking paper piece 4 is peeled off, the cut marks 18 having unevenness as shown in the figure remain after cutting the perforated perforation line 11, so that the cutting marks 18 remaining on the masking paper piece 4 and the first postcard paper piece 5 can be seen. For example, it is possible to determine whether the package has been opened during mailing.

------ Modification ------------------------------------------ ----------------------
In the above-described embodiment, the first postcard paper piece 5 and the second postcard paper piece 6 employ a structure in which the upper paper 2 and the lower paper 3 are completely bonded together by the strong adhesive layer 24. Instead, FIG. 9 and FIG. As shown in FIG. 10, the communication side paper can be a pressure-sensitive copying paper.

  The concealed postcard sheet 1 shown in FIG. 9 employs a carbon copy-type copy structure for the first postcard paper piece 5 and the second postcard paper piece 6, and is a copy obtained by spot printing black carbon ink on the surface of the lower paper 3. A layer 26 is provided, and an information copy column is provided on the back surface of the upper paper 2 facing the layer 26. Other structures are the same as those of the above-described embodiment. According to such a carbon copy structure, when necessary information is entered in the information entry field provided on the back surface of the lower paper 3, the carbon ink of the copy layer 26 is peeled off by the writing pressure, and the information copy field on the back surface of the upper paper 2 The necessary information entered in the information entry column is copied to the information copy column. Therefore, the applicant can keep it as a copy of the application form by removing the lower sheet 3 after filling in the necessary information.

  Further, a carbonless copying structure as shown in FIG. 10 may be adopted instead of the carbon copying type copying structure as shown in FIG. The concealed postcard sheet 1 shown in FIG. 10 is provided with a color former layer 27 in which a microcapsule containing a color former is applied on the surface of the lower paper 3 for the first postcard paper piece 5 and the second postcard paper piece 6 and is opposed thereto. An information copying column is formed by a developer layer 28 in which a developer that reacts with a color former is applied to the back surface of the upper paper 2. Other structures are the same as those of the above-described embodiment. Even with such a carbonless copy structure, the same effect as the concealed postcard sheet 1 of FIG. 9 can be obtained.

  Although not shown in the drawings, the sealing portions 7 and 8 provided on the outer edges of the first postcard paper piece 5 and the second postcard paper piece 6 are replaced by a double-sided adhesive having high adhesive strength instead of the strong adhesive layer 24 coated with a strong adhesive. Tape may be used.

The external view which looked at the concealment postcard sheet | seat of this invention from the front side. The external view which looked at the concealment postcard sheet | seat of this invention from the back side. The AA sectional view taken on the line of the cover-up postcard sheet | seat of FIG. Explanatory drawing which shows the state which wound the concealment postcard sheet | seat of this invention, and was folded in three. Explanatory drawing which shows the state which isolate | separated the 2nd postcard paper piece from the concealment postcard sheet | seat of this invention. Explanatory drawing which shows the state which peeled the back surface of the masking paper piece from the masking postcard sheet | seat of this invention. Explanatory drawing which shows the state which sealed the concealment postcard sheet | seat of this invention. Explanatory drawing which shows the state which opened the concealment postcard sheet | seat of this invention. Sectional drawing which shows the other structural example of the concealment postcard sheet | seat of this invention. Sectional drawing which shows the other structural example of the concealment postcard sheet | seat of this invention. Explanatory drawing which shows an example of the conventional concealment postcard sheet | seat. Explanatory drawing which shows the other example of the conventional concealment postcard sheet | seat.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Concealment postcard sheet 2 Upper paper 3 Lower paper 4 Concealment paper piece 5 1st postcard paper piece 6 2nd postcard paper piece 7 Sealing part 8 Sealing part 9 Concealment postcard 11 Boundary line 12 Boundary line 13 Cut line 14 Cut line 15 Fold line 16 Fold line 17 Corner cut 18 Cut trace 21 Hiding layer 22 Adhesive layer 23 Peeling layer 24 Strong adhesion layer 25 Peeling layer 26 Copying layer 27 Color former layer 28 Developer layer

Claims (4)

A concealed postcard sheet in which a rectangular sheet is divided into three areas by two boundary lines parallel to the short side, a concealing paper piece is arranged in the center, and a concealing paper piece shorter than the concealing paper piece is connected to both sides of the concealing paper piece. Because
A pair of cutouts that have a releasable adhesive layer on one side of the masking paper piece, a sealing part having a strong adhesive layer on the outer edge of the postcard paper piece via a fold line, parallel to the boundary line inside the boundary line A concealing postcard sheet that forms a line and has a width from a cut line on one side to a boundary line on the other side of the concealing paper piece set shorter than a width from a folding line to the boundary line on the postcard paper piece .   2. The concealed postcard sheet according to claim 1, wherein a width from the fold line to the boundary line of the postcard paper piece is set to a maximum value of a short side of the postcard.   The concealed postcard sheet according to claim 1 or 2, wherein the rectangular sheet has a two-layer structure in which two sheets are bonded together.   4. The concealed postcard sheet according to claim 3, wherein the paper on the communication side of at least a postcard piece is pressure-sensitive copying paper.

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