JPH01294441A - Envelope cover sheet and envelope - Google Patents

Abstract

PURPOSE:To improve the imprinting property and writing property, and obtain an envelope cover sheet which is equipped with a transparency for an envelope cover, by applying a pigment layer of silicon dioxide on the surface of a paper with transparency or a transparent plastic film. CONSTITUTION:It is an envelope cover sheet for which a pigment with transparency or a mixed layer of a transparent pigment and water absorbent polymer is applied on the surface of a paper with transparency or transparent plastic film. As the paper with transparency, generally a paper with transparency is enough, and to have lower than 20% of opacity is required. As the transparent plastic film, a film of polyester, polypropylene, etc. is used. As the pigment for the pigment layer with transparency, a silicon dioxide, such as fine grain amorphous silica, colloidal silica, etc. can be counted. The fine grain amorphous silica is preferable among them. For the pigment layer, a pigment with transparency is dispersed on a synthetic resin of acrilic, polyester, or vinyl acetate, and cellulosic derivative, etc. to make a coating material, and this coating material is applied on a paper with transparency or transparent plastic film to form the pigment layer.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is an envelope cover sheet suitable for enclosing invoices, notices, etc. printed by a printer linked to an electronic sieve machine, etc. by a drying machine. and regarding sealed letters.

[Prior Art] Conventionally, it has been known to use a computer printer to print the addressee, amount, etc. on a letter pad, fold the letter pad, and glue the surrounding area to an envelope. In order to adhere to the sealed letter, a heat-sensitive or pressure-bonding adhesive is applied to the predetermined areas of the letter after printing, and the letters are bonded by heating or pressure after printing. There is.

Recently, many types of printing printers that apply heat, such as thermal printers, have come into use, but if you use a letter pad coated with adhesive, the adhesive will dissolve during printing. There is an inconvenience that may cause the printer to malfunction. In addition, it is necessary to provide a gluing space for applying adhesive to the calligraphy 1ffl note, which causes the inconvenience that a part of the paper is wasted. There is a limit to the number of folds, and for example, folding into four is difficult due to the printer's feed holes at both ends of the paper, and there is an inconvenience in that it is not possible to form multiple tear-off pieces like a payment slip.

In order to solve these problems, the present applicant has proposed an envelope in which a letter printed by a printer or the like can be inserted at the same time as the envelope is manufactured.

(Utility Model Application Publication No. 62-76140) This proposal consists of a cover made of transparent paper with a heat-fusible transparent synthetic resin film layered on the inner surface, and a plain paper such as kraft paper or the same cover as the above-mentioned cover. This is a sealed letter in which a letter pad is inserted between an arbitrary backing paper such as, etc., and the peripheral parts of the cover and backing paper are bonded together by heating to form a sealed part.

[Problem to be solved by the invention] However, even if transparent paper is used on the surface of the envelope,
Although the address printed on the letter paper inserted inside the envelope is clearly visible, the gluing of postage stamps, etc., which is originally required for the cover of the envelope, the imprinting of the date of correspondence, and the writing performance of water-based pens are still insufficient. there were.

The purpose of the present invention is to solve the above-mentioned problems, and improve the adhesiveness of stamps, etc. on the surface of envelopes, the imprintability of date stamps, etc., and the writability of water-based pens, and also improve the transparency of envelope covers. To provide an envelope cover sheet that has the following functions.

Another purpose is to supply the inner surface of the envelope cover sheet, together with a cover layered with a heat-fusible synthetic resin film and another backing paper, to an automatic envelope manufacturing machine, and connect it to an electronic scraping machine to print out letters. To provide a sealed letter obtained by printing and folding correspondence such as the addressee and various amounts requested, and simultaneously manufacturing the envelope and inserting a letter pad.

[Means for Solving the Problem] As a result of extensive research, the present inventors have developed a layer containing a specific inorganic pigment or a water-absorbing polymer mixed with a specific inorganic pigment on the surface of transparent paper or plastic film. It has been discovered that by forming a , it is possible to improve the gluing properties of postage stamps, stamping of correspondence date stamps, etc., and the writing properties of pencils, water-based pens, and ballpoint pens without impairing transparency.Based on this knowledge, the present invention has been developed. I was able to complete it.

That is, the present invention is an envelope cover sheet having a transparent pigment or a mixed layer of a transparent pigment and a water-absorbing polymer on the surface of transparent paper or a transparent plastic film. Furthermore, on the inner surface of the envelope cover sheet,
A heat-fusible transparent synthetic resin film is layered to form a cover, another backing paper is superimposed on the synthetic resin film surface of the cover, a letter pad is inserted between the cover and the backing paper, and the cover and backing paper are stacked. This is a sealed letter whose peripheral edge is sealed by heating.

The transparent paper used in the present invention may generally be any transparent paper, and must have an opacity of 20% or less. For example, in addition to glassine paper, paper that has been transparently processed without reducing writing properties can be used.

Furthermore, as the transparent plastic film, films of polyester, polypropylene, polystyrene, polyvinyl chloride, etc. are used.

Examples of the pigment used in the transparent pigment layer include silicon dioxide such as fine particle amorphous silica and colloidal silica, and among them, fine particle amorphous silica is preferred. The pigment layer is made by dispersing the transparent pigment in acrylic, polyester, or vinyl acetate synthetic resins, cellulose derivatives, etc. to form a paint, and coating this on transparent paper or a transparent plastic film. Forming a pigment layer 3. The amount of pigment used is 15 to 200 parts by weight per 100 parts by weight of the synthetic resin, and the coating amount of the pigment layer is sufficient at 0.5 to 5 g/i. .

In the present invention, water-absorbing polymers to be mixed with transparent pigments include insoluble resins with a crosslinked structure, which are usually called super-absorbent resins and super-absorbent polymers, as well as water-soluble resins that are not processed or treated. Water-absorbing resins such as those that introduce a crosslinked structure by heat treatment after shaping.
Any polymer can be used.

The amount of the water-absorbing polymer used is preferably equal to or less than that of the pigment, and is preferably 15 to 200 parts by weight per 100 parts by weight of the synthetic resin.

A transparent pigment and a water-absorbing polymer are dispersed in the synthetic resin to form a mixed paint. The coating value on the surface of transparent paper or transparent plastic film is 0.5 to 5.
! J/7+1 is sufficient.

By providing a transparent pigment layer or a mixed layer of a transparent pigment and a water-absorbing polymer on the entire surface of transparent paper or transparent plastic film, the printed part of @paper inside 14 can be It has the advantage that it can be read and also that it can be stamped or written at a desired location on the surface of the envelope.

Further, the pigment layer or the mixed layer of the pigment layer and the water-absorbing polymer does not necessarily need to be provided on the entire surface of the envelope, and may be provided only on the area where stamping or writing is required.

As an example of using the envelope cover sheet described above to make an envelope cover, a heat-fusible transparent synthetic resin film is layered on the inner surface of the envelope cover sheet.

The heat-sealable transparent synthetic resin film to be layered on the inner surface of the envelope cover sheet of the present invention may be any material that can be heat-sealed to the backing paper, such as polyethylene, polypropylene,
Polyvinyl alcohol or the like is used.

The backing paper used for the envelope of the present invention may be any paper such as plain paper such as kraft paper, transparent paper the same as the cover, or paper overlaid with a heat-adhesive transparent synthetic resin film. A paper film composite is used.

The sealed letter of the present invention can be manufactured as follows.

At the same time, it is unique in that the letter is enclosed inside the envelope. First, the addressee, billing amount, and other communication information are printed on a piece of paper connected to a computer to form a letter pad, which is then folded into a predetermined size with the addressee on the outside. Transparent paper or transparent Plus Deck film with a transparent pigment layer or a mixed layer of transparent pigment and water-absorbing polymer on the surface prepared separately, that is, the inner surface of the envelope cover sheet of the present invention The letter pad is inserted between continuous strips of a cover layered with a transparent heat-fusible synthetic resin film and another backing paper, and the peripheral edges of the cover and backing paper are inserted according to the dimensions of the desired envelope. is heat-sealed to form a sealed portion, and placed in each envelope to complete the sealed letter of the present invention.

[Embodiment] One embodiment of the envelope cover sheet and sealed letter of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing a state in which a letter 4 is enclosed in a sealed letter according to the present invention. The letter paper 4 is formed by easily printing communication information such as the addressee, separate payment, sender's name, and the billed amount in the invisible part using a thermal printer linked to a computer.

FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and is a sectional view showing a state in which a letter 4 is enclosed in the sealed letter of the present invention. A heat-fusible transparent synthetic resin film 3 is formed on the inner surface of an envelope cover sheet B, which has a transparent pigment layer 2 coated on the surface of a transparent paper 1 on a paper-like surface, by laminating polyethylene or the like. Let's call the cover a.

Using bleached kraft paper as the backing sheet, the envelope is produced together with the cover a, and the letter 4 is inserted into the envelope.The letter 4 is inserted between the cover a and the backing sheet, and then the cover a and the envelope are inserted. The heat-sealable transparent synthetic resin film 3 is heated on the peripheral edge of the backing sheet using a bar sealer to form a heat-sealed portion 5 to form a sealed portion, and the sealed letter of the present invention is sealed.

The cover and backing paper may have the same structure using transparent paper, but the backing paper side may be made of opaque plain paper such as kraft paper or roll paper, or may be made of opaque paper. If paper with a synthetic resin film layered over it is used, the letter pad cannot be seen from the back of the envelope, so the back side of the letter pad can be effectively used for printing correspondence articles, etc.

In the embodiment described above, an example was explained in which communication information such as separate payment, addressee, sender, billed amount, etc. is printed on Yoshiura notes using a thermal printer linked to an electronic computer. It is also possible to print communication items, patterns, solid printing, etc.

[Example] An example of the present invention is shown.

Example 1 Preparation of pigment paint Acrylic resin (+13-H-13 manufactured by Nippon Kako Toyo Co., Ltd.)
50 parts of silicon dioxide (Syroid 308) powder was added to 100 parts by weight and dispersed to prepare a pigment paint.

Creation of envelope cover sheet Basis weight 30.5g/Td, transparency 84% (opacity 13.
The pigment paint prepared above was coated on the surface of glassine paper (5%) to a coating amount (solid content) of 2 g/Td, dried, and the envelope cover sheet was coated with transparency, stampability, and stamp adhesive. Table 1 shows the results of the tests for character and writing ability.

Test method Shachihata's black stamp ink was applied to a transparent circular rubber stamp and stamped on the surface of a paper sample. Immediately after, the stamp was rubbed with gauze and the erasure, drying, and permeability of the print were visually evaluated.

Evaluation criteria ◎...Printing is clear and ink adhesion is stable.

O: The print is partially unclear, and there are some spots where the ink has not transferred.

△: Printing is unclear and there are many areas where ink has not been transferred.

X: Printing is unclear and ink is deposited in dots (=J).

To apply stamp adhesive, water was applied to the back of a stamp, and the stamp was pasted on the surface (pigment-coated surface) of a test R3I envelope cover sheet. After 1 hour, it was removed and the adhesion condition was evaluated.

Evaluation criteria: ◎...If you try to peel it off with your fingers, the stamp will almost tear, and it is completely glued.

0: It cannot be easily peeled off even if you try to peel it off by applying force with your fingers, and it is adhered.

Δ: It peels off when you put pressure on it with your fingers, and the adhesion is weak.

X: Easily peeled off with fingers, not adhered.

Hardness H is applied to the surface (pigment coated surface) of the envelope cover sheet of the writability sample.
The sharpness of the pencil handwriting was evaluated by writing with a B pencil.

O...The handwriting is clear.

Δ...The handwriting is partially unclear.

X: No handwriting remains (unable to write).

Example 2 An envelope cover sheet was obtained in exactly the same manner as in Example 1, except that the amount of silicon dioxide was changed to 15 parts by weight.

Comparative Example 1 A comparative sample was obtained in exactly the same manner as in Example 1, except that silicon dioxide was not mixed and only the synthetic resin was coated.

Comparative Example 2 Glassine paper (used in Example 1) not coated with pigment paint was used as a sample.

Example 3 The same procedure was carried out as in Example 1, except that 15 parts of silicon dioxide was used, and 15 parts of sodium acrylate polymer-based superabsorbent resin (Sumikagel MP-1010 manufactured by Sumitomo Chemical) was mixed and dispersed therein. Make 1q envelope cover sheet in exactly the same way as Example 1.

Comparative Example 3 A comparative sample was obtained in exactly the same manner as in Example 3, except that silicon dioxide was not blended and only the super absorbent resin (used in Example 3) was coated.

The test results of the above Examples and Comparative Examples are shown in Table 1.

Table 1 As is clear from Table 1, the pigment layer of the present invention (Example 1.2) and the pigment and water-absorbing polymer mixed layer (Example 3) Compared to those with only a layer (Comparative Example 2), those without a pigment layer (Comparative Example 2), and those with only a water-absorbing polymer layer (Comparative Example 3), they maintain transparency, have excellent stamping properties, and have excellent stamp adhesive properties. This sheet is an excellent envelope cover sheet that satisfies all aspects of performance and writability.

Example 4 Preparation of pigment paint 100 parts by weight of a polyester resin (G polyester AC varnish, manufactured by Narita Shokai) was blended with 50 parts by weight of silicon dioxide (Mizukashiru P78D, manufactured by Mizusawa Chemical Co., Ltd.), and dispersed and mixed to form a pigment paint. Prepared.

Creation of envelope cover sheet Apply the pigment paint prepared above on the surface of a 20 μm thick biaxially stretched polypropylene film with a transparency of 96% (uncertainty: 5%) to a ratio of 1 (solid content) 2/11 t. It was dried to obtain an envelope cover sheet.

Regarding the obtained envelope cover sheet, transparency, imprintability,
Stamp gluing is based on the results of tests on gender and writability.
Shown in the table.

Example 5 An envelope cover sheet was obtained in exactly the same manner as in Example 4, except that the amount of silicon dioxide was changed to 15 parts by weight.

Comparative Example 4 A comparative sample was obtained in exactly the same manner as in Example 4, except that silicon dioxide was not blended and only the synthetic resin was coated.

Comparative Example 5 A biaxially stretched polypropylene film (used in Example 4) not coated with a pigment paint was used as a sample.

Example 6 In Example 4, 15 parts of silicon dioxide was used,
Add 15% of the super absorbent resin (used in Example 3) to this.
An envelope cover sheet was obtained in the same manner as in Example 4 except for mixing and dispersing the parts by weight.

Comparative Example 6 Comparative sample 19 was prepared in exactly the same manner as in Example 4, except that silicon dioxide was not blended and only the super absorbent resin was coated.

The test results of the above Examples and Comparative Examples are shown in Table 2.

As is clear from the results in Table 2, in Examples 4 and 5, in which the pigment layer of the present invention was provided, and in Example 6, in which a mixed layer of pigment and water-absorbing polymer was provided, the synthetic resin layer (Comparative example 4), one without pigment layer (Comparative example 5)
, compared to Comparative Example 6) with only a water-absorbing polymer layer,
This is an excellent envelope cover sheet that maintains transparency and satisfies all aspects of stampability, stamp adhesion, and writability.

[Effects of the Invention] The envelope cover sheet of the present invention improves the conventional envelope cover and maintains transparency while improving the adhesiveness of postage stamps, the imprintability of date stamps, etc., and the ease of stamping with water-based pens. This is an excellent envelope cover sheet that successfully satisfies all aspects of writing performance.

By providing a heat-fusible synthetic resin film on the back side of the envelope cover sheet of the present invention and feeding it together with another backing paper to an automatic Murayama machine, it can be connected to an electronic computer and used to print addresses and letters on separately inserted letter paper. The envelope of the present invention can be obtained by printing and folding communication information such as the billed amount, and inserting a letter pad at the same time as manufacturing the envelope.

The resulting sealed letter is excellent because it is possible to read the address printed on the inside of the letter pad from the surface of the envelope, as well as to attach stamps such as postage stamps, to stamp the date of communication, and to write on it using water-based pens, pencils, etc. ing.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the appearance of an embodiment in which a letter is enclosed in an envelope using the envelope cover sheet of the present invention, and FIG. 2 is a partially enlarged sectional view taken along the line A--A in FIG. 1. DESCRIPTION OF SYMBOLS 1... Transparent paper, 2... Pigment layer, 3... Heat-fusible transparent synthetic resin film, 4... Letter paper, 5... Heat-fusible part (sealing part), B. ... Envelope cover sheet, a...cover, b...backing paper.

Claims (1)

[Claims] 1. An envelope cover sheet having a silicon dioxide pigment layer on the surface of transparent paper or transparent plastic film. 2. An envelope cover sheet having a mixed layer of silicon dioxide and water-absorbing polymer on the surface of transparent paper or transparent plastic film. 3. A heat-adhesive transparent synthetic resin film is layered on the inner surface of an envelope cover sheet having a pigment layer of silicon dioxide on the surface of transparent paper or a transparent plastic film, and the said cover is A sealed letter is characterized in that a backing paper is superimposed on the synthetic resin film surface of the above, a letter pad is inserted between the cover and the backing paper, and the peripheral edges of the cover and the backing paper are bonded together by heating to form a sealed part. 4 A heat-fusible transparent synthetic resin film is layered on the inner surface of an envelope cover sheet that has a mixed layer of silicon dioxide and water-absorbing polymer on the surface of transparent paper or a transparent plastic film. A backing paper is superimposed on the synthetic resin film surface of the cover, a letter pad is inserted between the cover and the backing paper, and the peripheral edges of the cover and the backing paper are bonded by heating to form a sealed part. A sealed letter.