DELIVERY SLIP SYSTEM AND METHOD FOR ITS PRODUCTION

Abstract: In a delivery slip system, an upper paper slip (17) bears appropriate printing (15) including blank spaces and a pressure-sensitive layer in a predetermined area on the back thereof; a see-through write-upon waterproof covering strip (18) of a film having a width larger than the delivery slip is adhered on top of said slip; one or more copy slips (13) having the same width as the delivery slip are disposed below said delivery slip; the covering film strip has an adhesive layer in the upper and lower edge portions on the back thereof; and a release paper strip (14) beneath the lowest copy slip adheres to said waterproof covering film strip in the upper and lower edge portions thereof. The cover film (18) may have an opacity of 20 to 50%, e.g. obtained by extruding a sheet of a thermoplastic resin and filler and stretching the sheet. The copy slips (13) are self-copying so that writing pressure on the cover film (18) within the blank spaces is copied onto the slips which can be separated at their end at perforations (46), and after peeling off the release paper (14) the slip 12 and protective film (18) are adhered to an article (e.g. a package) by the adhesive on the rear of portions of the film. A method of making the delivery slip system is de­ scribed.

Description: This invention relates to a delivery slip system or assemblage intended to be affixed to an article (e.g. an envelope or package) to be delivered by a messenger employed by a delivery agency; the system includes an address label for delivery of the article and at least one copy slip; the address label must be securely affixable to the package and the copy slip(s) must be readily removable when required. The delivery slip system which has been conventionally used by delivery firms generally comprises, as shown in Figs 1 to 5 of the drawings, a delivery slip 1 which is adhered onto an article to be delivered, a copy slip 2 for the sender, a freight bill slip 3, a sales slip 4, a copy slip 5 for the issuer and a copy slip 6 to serve as a receipt, which are arranged from top to bottom in that order, and further comprises a transparent covering 10 which does not have write-on properties by pencil or ballpoint pen placed on the slip 1 and composed of a transparent synthetic resin film 7 coated with a pressure-sensitive adhesive on the left-hand and right-hand portions on the back thereof and two sheets of release paper 8 and 9 covering the adhesive-coated areas 8a and 9a on the film. Delivery slip 1, copy slip 2 for sender, freight bill slip 3, sales slip 4, copy slip 5 for issuer and copy slip 6 for receipt making, each slip being made of pulp paper, are bonded together at the left-hand end thereof and inserted between the film body 7 and the release paper 8 in the right-hand portion of the above covering, and the left-hand end of the delivery slip is bonded to the back of the film 7. Each of slips 1 to 6 is an opaque paper strip mainly composed of a pulp material and bears appropriate printing, for example, a printed form including blanks which will be filled up with address, name of addressee, deliverer, kind of article, etc. The transparent synthetic resin film has an opaqueness of 3% or less and a haze of 5% or less. (See Japanese Patent Application (OPI) No. 18297/83. The term "OPI" as used herein refers to a published unexamined Japanese patent application . The blanks 1a, 1b, etc. on the delivery slip 1 in such a delivery slip system (A) are filled up with address and name of addressee (1a), sender's name with or without address (1b), and other particulars as necessary, and these particulars are simultaneously copied on the slips 2 to 6. Thereafter, the delivery slip 1 together with the covering 10 is separated, and the release paper strips 8 and 9 are peeled off, whereby the adhesive-coated areas 8a and 9a are exposed. The delivery slip 1 and the covering 10 are then together adhered to an article (not shown) to be delivered via the adhesive areas 8a and 9a at an appropriate place, for example, on the top of the article, so that the delivery slip 1 can be seen through the film body 7. The delivery slip 1 is protected against rain and the like by the transparent film body 7. Accordingly, the transparent synthetic resin film body 7 constituting the covering 10 and having a haze of 5% or less is of a size larger than the delivery slip 1. Thus, in the conventional example shown, the film body 7 has extra portions 7a, 7b and 7c on the upper, lower and left sides, respectively, as compared with the delivery slip 1. It is necessary in the prior art delivery slip system (A) that the covering 10 should be separated from the delivery slip 1 prior to filling up the blanks. After writing necessary particulars with a pencil, a ball-point pen or some other writing device to thereby attain simultaneous copying on the copy slips, the release paper strips 8 and 9 are peeled off from the covering 10, and the film body 7 is adhered onto an article to be delivered while holding the deliver slip 1 under pressure on the article and using sufficient care not to cause exposure of the slip 1. In this manner, the delivery slip 1 is prevented from damage caused by rainwater or the like. The see-through cover film 10 is essential to the delivery slip 1. Moreover, separation of the release paper strips 8 and 9 from the covering 10 takes time, and covering of the delivery slip 1 with the film body 7 while carefully holding the slip under pressure is particularly troublesome. For the purpose of avoiding such difficulties encountered in using the prior art delivery slip system in which such transparent covering 10 on which it is impossible to write with a ball-point pen, a pencil or the like is used as the topmost layer, a proposal has already been made, according to which an opaque synthetic paper sheet which receives writing is used as the topmost layer (Japanese Patent Application (OPI) No. 29699/83 and Japanese Utility Model Application (OPI) No. 133470/83). The delivery slip system according to this proposal comprises a delivery slip comprising an opaque synthetic paper strip on which it is possible to write, having an opaqueness of 80 to 100% and having printing with blanks to be filled up, several copy slips made of pulp paper having a width narrower than the delivery slip and which are disposed below the delivery slip, and a backing release paper strip fixed in position by means of an adhesive layer applied to the upper, lower and left edge portions of the delivery slip. Such a delivery slip system is produced by printing the delivery slip and copy slips having the same width (in the longitudinal direction) as the delivery slip proper using a printing machine such as a form printing press for stock certificate printing, cutting off the upper and lower edge portions of the copy slips to make a desired width, combining these with the delivery slip and backing the resulting system with a release paper strip. The reason for producing copy slips having the same width as the delivery slip and then reducing the size of copy slips is due to the fact that the printing on the delivery slip and that on each copy slip must always be positioned overlappingly so that when the blanks on the delivery slip are filled up with particulars, the same particulars can be copied on the respective corresponding blanks on each copy slip with the aid of a carbonless or carbon-containing pressure-sensitive layer on the back of the delivery slip and a pressure-sensitive layer on the back of each copy slip and accordingly the positioning in printing is conducted by taking advantage of a row of lead apertures on one or both margins of paper sheets. A further reason is that since the printing on the delivery slip should be located roughly in the middle part of the lengthwise width in order that the upper and lower edge portions of the slip can subsequently be adhered to the release paper sheet, the continuous paper sheet printed is fed in a continuous high-speed printing using the lead appertures on margins on both sides thereof so that the position of each blank on the delivery slip and the position of the corresponding blank on copy slips may not differ substantially. For this reason, copy slips having the same width as the delivery slip are first printed at a high speed in the continuous strip form and then deprived of the upper and lower edges to a necessary extent by cutting. For providing the upper and lower edge portions of the delivery slip with an adhesive layer, a covering paper strip having the same width as the copy slips is placed on the release paper strip in the middle part thereof, an adhesive emulsion is applied by spraying to the whole exposed surface of the release paper strip and covering strip, and the delivery slip, the copy slips and the release paper strip with a covering or insert paper strip placed thereon and placed one upon another in sequence and then pressed together to give a delivery slip system in which the copy slips are contained in something like a tubular space formed by the delivery slip and release paper strip. The process for producing the latter delivery slip system is disadvantageous in that the step of cutting of the upper and lower edge portions of copy slips following printing and preparation of copy slips having the same width as the delivery slip is required and this leads to a reduction in productivity, and further in that a positioning mechanism for the formation of an adhesive layer only in the upper and lower edge portions, a device for the application, by spraying, of an adhesive emulsion all over the release paper strip with a covering paper strip placed thereon and a device for the insertion of an insert paper strip between the lowest copy slip and the release paper strip to thereby prevent the lowest copy slip from becoming adhered to the release paper strip on the occasion of writing in are required, so that the equipment is complicated and the productivity is poor. Further, the latter delivery slip system has the disadvantage in that since the delivery slip is made of a synthetic resin film, the film swells, due to a solvent contained in a carbon layer provided at the desired portion on the back of the delivery slip and creases occur, resulting in deterioration of the appearance. Moreover, since the size precision is different between the synthetic resin film of the delivery slip and the pulp paper of the copy slip, after the printing is dried, due to the difference in shrinkage of the film and paper, the lengths of the printing lines for blanks printed thereon are slightly different and as a result, deviation of the printing lines on each slip tend to occur. As a result of extensive investigations, it has been found that the above drawbacks of the prior art can be removed by uniting a see-through waterproof covering film strip on which it is possible to write and a delivery slip proper into one body which can be adhered quickly and easily on an article to be delivered. Accordingly, the present invention provides a delivery slip system comprising a delivery slip having necessary printing thereon and blank areas for writing in and a pressure-sensitive layer on a predetermined area on the back thereof, which is to be adhered onto an article to be delivered, one or more copy slips having the same width as the delivery slip and disposed below the delivery slip and a transparent waterproof film covering coated with a pressure-sensitive adhesive layer on portions on the back thereof and a release paper covering the adhesive-coated areas; characterised in that the transparent covering is constituted by a see-through covering film strip having a matt front surface on which writing is possible by ink or pencil and which has a width greater than said delivery slip, the release paper is a strip adhering to the covering film at portions above and below the delivery slip, and the delivery slip proper is bonded to the back of the covering film strip so as together to form a tube enclosing the copy slips. The invention also provides a method for producing such a delivery slip system which is easy to handle, comprising a delivery slip applied to the back of a transparent or semitransparent waterproof covering film strip on which is possible to write, copy slips having the same width as the delivery slip, and a backing release paper strip, in a continuous manner with markedly improved productivity. This method can quickly meet a huge demand for the delivery slip system. The method for producing the delivery slip system according to the present invention comprises applying a transparent adhesive to the back of a transparent or semitransparent waterproof film having a matt front surface on which it is possible to write with pen or pencil in the form of a continuous strip; drying said film; feeding the dried film to a combining mechanism; feeding a release paper sheet in the form of a continuous strip having the same width as said waterproof film to said combining mechanism; feeding, in the same feeding direction of said waterproof film and release paper sheet, a set of a delivery slip and one or more copy slips which have a width narrower than said waterproof film but have the same width as one another, to said combining mechanism in a manner such that said set of slips comes between said waterproof film and said release paper sheet and the front of the delivery slip faces the back of said waterproof film; making, in said combining mechanism, the delivery slip belonging to said set of slips bonded to the back of said waterproof film except for the upper and lower margin portions thereof and at the same time causing the adhesive layer formed on said waterproof film to become strippably adhered to said release paper sheet; and cutting the resulting combination to a predetermined length to thereby provide a delivery slip system, whereby the copy slips can be taken out freely from the tube-like space formed by said waterproof film and release paper sheet. In the accompanying drawings: Figure 1 is a plan view of a known delivery slip system; Figure 2 is a perspective view of the same; Figure 3 is a side view of a left-hand end portion of the same; Figure 4 is a side view of a right-hand portion of the same; Figure 5 is a side view of that slip in the slip system which is adhered to an article to be delivered. Figure 6 is a plan view of a delivery slip system according to the invention, partly turned back; Figure 7 is a rear view of the delivery slip proper in the slip system; Figure 8 is a magnified sectional view of the slip system taken along the line VIII-VIII in Fig. 6; Figure 9 is a schematic representation of a method for producing the delivery slip system according to the invention; Figure 10 is a front view of a coating roll; Figure 11 is a partial plan view of the back of a continuous waterproof film strip with an adhesive layer formed on the back; Figure 12 is a perspective view of a set of slips used to produce the delivery slip system according to the invention; and Figure 13 is a plan view of another example of the slip adhered to an article to be delivered, which is bonded to the back of a waterproof cover film. The delivery slip system according to the present invention is explained by reference to Figures 6 to 9. The delivery slip system 11 comprises a delivery slip 12 adhered on an article to be delivered, a plurality of copy slips 13 and a release paper strip 14. The slip 12 adhered on an article to be delivered comprises a delivery slip 17 made of pulp paper having a necessary printing 15 with blanks on the front surface thereof and a pressure-sensitive layer 16 on a predetermined area on the back thereof and a see-through waterproof covering film body 18 on which writing is possible at least on the front and the delivery slip is integrally fixed on the back of the film body 18. The see-through waterproof film on which writing is possible used in the present invention may have an opaqueness of 20 to 50% as determined by the method prescribed in JIS P-8138, and may be transparent or semitransparent. Such a film preferably has an opaqueness of 40% or less and is made from a film-forming material such as a thermoplastic resin, e.g., polypropylene, low-density polyethylene, polyethylene terephthalate or a polyamide: or a thermosetting resin, e.g., an unsaturated polyester resin, acrylic resin, epoxy-acrylate resin or acrylic-urethane resin. The film is preferably matt-finished to improve the writing properties thereof by ink, pencil or the like. Examples of such matted, see-through waterproof film on which it is possible to write includes the following films (1) to (7): (1) A film (formed on a delivery slip) which is produced by coating the slip with a roll coater or a brush with a mixture of an emulsion or solution (varnish) of (a) a thermosetting resin, e.g. as exemplified above and (b) 0.5 to 10% by weight of an inorganic filler and/or an incompatible resin filler incorporated therein, and curing the coating; (2) A film obtained by melt kneading a mixture of (a) a thermoplastic resin, e.g. as exemplified above and (b) 0.5 to 50% by weight of an inorganic filler and/or an incompatible resin filler and extruding the mixture; (3) A film obtained as in (2) above wherein the mixture is extruded into a sheet-like material which is uniaxially stretched at a stretch ratio of 2.5 or more [e.g. synthetic paper "Yupo TPG" (trade mark), manufactured by Oji Yuka Goseishi Co., Ltd., Japan]; the product has the aforesaid 20 to 50% opacity (4) A film obtained by sandblast treating the surface of a film of a flexible waterproof, transparent, synthetic plastics material; (5) A film obtained by treating the surface of such a plastics film with a good solvent for the film material and washing the surface with water (e.g. natural spring water); (6) A film produced by contacting a film of a synthetic resin, while it is still soft after its extrusion or calendering, with an embossing roll and cooling the film to transfer the embossed pattern; (7) A film obtained by extruding an ethylene-propylene block copolymer with or without subsequent uniaxial stretching. The materials for forming films (4) to (7) may contain 0.5 to 7% by weight of an inorganic filler. These films preferably have a thickness of 10 to 100 microns. The waterproof covering film body 18 has a width greater than the delivery slip 17 and is provided with an adhesive layer 19 on the back thereof in the portion between the upper edge 17a of the delivery slip 17 applied to the back of the film body and the upper edge 18a of the waterproof covering film body 18, namely, in the upper edge portion 18b of the waterproof covering film body 18, and with an adhesive layer 20 in the portion between the lower edge 17b of the delivery slip 17 and the lower edge 18c of the waterproof covering film body 18, namely, in the lower edge portion 18d on the back of the waterproof covering film body 18 (cf. Fig. 7). As shown in Fig. 13 showing another embodiment, adhesive-free portions 25 may be provided between the upper edge portion 18b and the lower edge portion 18d and further an adhesive layer 19a may be left in the left-hand edge portion for subsequent contact with the release paper strip 14. It is not always necessary to provide the front surface of the waterproof covering film body 18 with printing with blanks to be filled up. The front surface of the film body has no adhesive layer. Copy slips 13, namely, copy slip 21 for agency, copy slip 22 for sender, copy slip 23 for reporting and copy slip 24 for issuer, which have the same longitudinal width as the above delivery slip 17 and a predetermined transverse width, are disposed such that the right-hand edge indexing portions 21a, 22a, 23a and 24a of these copy slips 21, 22, 23 and which are made of pulp papers are exposed with the upper and lower edges respectively in line. They are temporarily bonded to the delivery slip 17 at the left edge portion on the back thereof. A release paper strip 14 having the same shape and size as the waterproof covering film body 18 is applied to the back of the lowest copy slip 24 in the copy slips 13 and the same time the adhesive layers 19, 20 and optionally 19a in the upper edge portion 18b, lower edge portion of 18d and the side edge portion of waterproof covering film body 18 are adhered on the release paper strip 14. In this way, the copy slips 21, 22, 23 and 24 having the same width are fixedly held in order below the delivery slip 17 as if they were contained in an envelope. The above copy slips 21, 22 and 23 are each provided with a pressure-sensitive layer in a predetermined area on the back thereof. Another feature of the invention, namely the method for producing such a delivery slip system, is explained by reference to Fig. 9. A transparent or semitransparent, waterproof film 12, such as a synthetic paper, which is possible to write at least on the front surface and taken up in the form of a continuous strip on a reel 26, is passed between a backup roll 27 and a coating roll 28 to apply a transparent adhesive 30 contained in a vessel 29 to the back of the waterproof film 12 by means of a doctor knife 31 to a desired thickness, whereby adhesive layers 19, 19a and 20 are formed. Via a guide roll 31, the waterproof film then enters a drying oven 32 through an inlet 33 and is led via intermediate rolls 34 and 35 and through an exit 36 to a guide roll 37. In the drying oven, the water or solvent contained in the adhesive 30 is evaporated and the film is dried to a desired extent. The waterproof film 12 is then led from the exit 36 of the drying oven 32 to a combining mechanism 39 via guide rollers 37 and 38. A release paper 14 taken up in the form of a continuous strip on a reel 40 and having the same width as the waterproof film 12 is led from the reel to the combining mechanism 39. The combining mechanism 39 comprises an upper roll 41 and a lower roll 42. A slip set 44 composed of a delivery slip proper 17 and copy slips 13 bonded together at their left-hand edge with an adhesive and each having printing with blanks to be filled up with address, sender, kind of article, delivery number, etc. on the surface thereof is guided onto a guide plate 43 for insertion of the slip set,which plate is disposed before the combining mechanism 39 between the path for the waterproof film 12 from the guide roll 38 to the upper roll 41 and the path for the release paper from the reel 40 to the lower roll 42 and inserted between the waterproof film running along the upper roll 41 and the release paper 14 running along the lower roll 42. While passing between the upper roll 41 and the lower roll 42, the waterproof film 12, the slip set 44 and the release paper 14 are combined into an assemblage in a predetermined manner (cf. Figs. 6 and 8). In this case, the circumferential surface of the coating roll 28 may be cylindrical but it is preferred that the roll has a circumference equal to the width of copy slips and, as shown in Fig. 10, further has impressions 28a and 28a on the circumferential surface for preventing adhesion of the adhesive on the corresponding areas on the waterproof film. This construction results in formation, on the back of the waterproof film 17 in the continuous strip form and by the adhesive applied by means of the coating roll 28, of an adhesive-coated region 19a having the same width as the waterproof film 17 and an adhesive-coated region 19, 20 having a predetermined width, each repeatedly appearing with an adhesive-free region 25 lying therebetween, as shown in Fig. 11. The adhesive-free region 25 facilitates the separation of the copy slips 13. The slip set 44 comprises, as shown in Fig. 12, the delivery slip 17 and the copy slips 21, 22, 23 and 24 having the same width as the delivery slip 17. All the slips are bonded at the left edge with an adhesive, and the left edge portion serves as a fixing portion 45. The copy slips 21, 22, 23 and 24 can easily be separated from the fixing portion 45 by taking advantage of a perforation 46. As shown in Figs. 6 and 13, the delivery slip 17 and the copy slips 21, 22, 23 and 24 each has a necessary printing on the front surface with blanks 15 at the same corresponding positions and is provided with a pressure-sensitive non-carbon or carbon layer 16 on the back thereof. The printing with blanks 15 on the delivery slip 17 can be seen through the waterproof film 12. The waterproof film 12 has a width greater than the delivery slip 17, and the upper, lower and left edge portions 18b, 18d and 18e on the back thereof where the delivery slip 17 is not adhered remain exposed and allow the release paper 14 to strippably bond to the waterproof film in these portions. The whole front surface of the delivery slip 17 is completely fixed on the back of the waterproof film strip 12, and the copy slips 21, 22, 23 and 24 bonded below the delivery slip 17 form the slip system by taking advantage of the perforation 46 provided in the fixing portion 45. In this way, the waterproof film 12 with the delivery slip 17 fixedly bonded to the back thereof and the release paper sheet 14 are adhered together at the upper, lower and left edge portions 18b, 18d and 18e, with the slip set 13 lying therebetween, and the whole is fed to a cutting mechanism 47 and cut to a predetermined unit length of delivery slip system 11, for example, in the transverse direction in the middle of the adhesive-coated region 19 or 20 as shown in Fig. 11 to give a unit delivery slip system 11. Therefore, the delivery slip system 11 takes a form such that the waterproof covering film body 12 and the backing release paper sheet 14, which are equal in shape and size, form something like a tube, and the copy slips 21, 22, 23 and 24 contained therein can be taken out therefrom from the left edge portion of the system. The delivery slip system 11 according to the present invention can be written on the waterproof covering film body 12 in blanks which can be seen on the delivery slip 17 through the waterproof covering film body 12 with a writing device, such as a ball-point pen using an oil-based ink or a pencil,while seeing through the waterproof covering film body 12, so as to, in effect, complete the blanks 15 of the delivery slip 17. At the same time, the particulars written in on the waterproof covering film body 12 are copied onto corresponding blanks on the copy slips 21, 22, 23 and 24 by the intermediary of the pressure-sensitive layer 16 on the back of the delivery slip proper 17 and the respective pressure-sensitive layers on the back of the copy slips 21, 22 and 23. Then, while applying pressure onto the waterproof covering film body 12 at a place corresponding to the fixing portion 45 of the slip set 13 from above by the left hand, the copy slips 21, 22, 23 and 24 are separated at the perforation 46. Thereafter, the backing release paper sheet 14 is removed and the delivery slip body 12 is applied to and adhered on an article to be delivered by applying strong pressure to the upper, lower and left edge portions of the waterproof covering film 12 which are provided with an adhesive layer, whereby the slip body 12 is fixed on the article (cf. Fig. 14). The delivery slip system according to the present invention is advantageous in that the delivery slip 17 can be fixed on an article to be delivered in a very easy and simple manner without any fear of dislocation or contamination or breakage of the delivery slip 17. The delivery slip system according to the invention in which the see-through waterproof covering film body which is possible to write and the delivery slip are united into a delivery slip body which is adhered on an article to be delivered makes it possible to apply the delivery slip body to such an article in a simple and easy manner. In particular, the separation of copy slips is conducted by drawing them out, so that the waterproof covering film body with the delivery slip proper fixedly attached to the back thereof is not required to be peeled off from the backing release paper sheet during the procedure. This also makes its handling easy.

Claims: A delivery slip system (1;17) comprising a delivery slip having necessary printing thereon and blank areas for writing in and a pressure-sensitive layer (16) on a predetermined area on the back thereof which is to be adhered onto an article to be delivered, one or more copy slips (6;13) having the same width as the delivery slip and disposed below the delivery slip and a transparent waterproof film covering coated with a pressure-sensitive adhesive layer (19,20) on portions (8a, 9a; 18b, 18d) on the back thereof and a release paper(8 and 9;14) covering the adhesive-coated areas; characterised in that the transparent covering is constituted by a see-through covering film strip (18) having a matt front surface on which writing is possible by ink or pencil and which has a width greater than said delivery slip (17), the release paper is a strip adhering to the covering film at portions (18b, 18d) above and below the delivery slip, and the delivery slip proper (17) is bonded to the back of the covering film strip (18), so as together to form a tube enclosing the copy slips (13). A delivery slip system as claimed in Claim 1, wherein said waterproof covering film strip (18) is made of a semitransparent film having an opaqueness of 20 to 50% as determined by the method of Japanese Industrial Standard P-8138. A method of producing a delivery slip system as claimed in Claim 1 or 2, which comprises applying a transparent adhesive (30) to the back of a transparent or semitransparent waterproof film (12) having a matt front surface on which it is possible to write with pen or pencil in the form of a continuous strip, drying said film; feeding the dried film to a combining mechanism (39); feeding a release paper sheet (14) in the form of a continuous strip having the same width as said waterproof film to said combining mechanism (39); feeding, in the same feeding direction of said waterproof film and release paper sheet, a set (44) of a delivery slip (17) and one or more copy slips (13) which have a width narrower than said waterproof film but have the same width as one another, to said combining mechanism in a manner such that said set (44) of slips comes between said waterproof film (12) and said release paper sheet (14) and the front of the delivery slip (17) faces the back of said waterproof film (12); making, in said combining mechanism, the delivery slip belonging to said set of slips bonded to the back of said waterproof film except for the upper and lower margin portions (18b, 18d) thereof and at the same time causing the adhesive layer (19, 19a, 20) formed on said waterproof film to become strippably adhered to said release paper sheet (14); and cutting the resulting combination to a predetermined length to thereby provide a delivery slip system (11), whereby the copy slips (13) can be taken out freely from the tube-like space formed by said waterproof film and release paper sheet. A method as claimed in Claim 3, for making a system as claimed in Claim 2, wherein the covering film (12) is formed from a film obtained by melt kneading a mixture of thermoplastic synthetic resin and 0.5 to 50% by weight of a filler, extruding the mixture into a sheet and uni-axially stretching the sheet at a stretch ratio of 2.5 or more.

Inventors: NITTA, KATSUKUNI C/O OJI YUKA GOSEISHI CO., LTD.
Applicants: OJI YUKA GOSEISHI CO., LTD.
Application year: 1985
Main classification: B41L1
IPC codes: B42C3, B41L1