JPS60110447A - Manufacture of laminated composite body with viewing window - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a laminated composite with a viewing window through which the contents can be seen through using heat sealing, and more specifically, it is easy to insert the contents and prevent the intrusion of water etc. (1) It also relates to a manufacturing method for a laminated composite with a viewing window that is passed through a continuous automatic packaging machine or bag making machine.

Conventionally, this type of laminated composite body and bag with a viewing window is made by laminating a transparent film (or sheet) large enough to cover the peripheral edge of a die-cut window hole. In this case, the die-cutting method is to cut a base material such as paper into a predetermined size, stack one or more sheets, and punch out a predetermined position using a die.

Therefore, packages and bags manufactured by such a method inevitably have a structure in which the peripheral edge of the film exists at the periphery of the window hole, so that (1) the contents are caught on the peripheral edge of the film; , which significantly reduces the efficiency of inserting the contents or packaging the contents. This phenomenon is particularly noticeable when the edge of the transparent film is raised (usually the edge is not bonded to the edge and is raised), and is more likely to occur when the content is thin such as a document. ■Moisture and dust can enter through poorly bonded areas, contaminating the contents and reducing quality.

A defective bonding area is not only caused by a defect in the process, but also (2) a thin material such as paper may cause the bonding area between the base material and the transparent film to separate, creating a defective area. ■There is a risk that the contents may be exposed or fall off from poorly bonded areas or peeled areas. (2) Due to the presence of the peripheral edge of the filler, it is difficult to pass through a bag making machine or a packaging machine, so it has disadvantages such as poor productivity.

The present invention, as a result of intensive research in view of the above circumstances, provides a method for manufacturing a laminated composite body with a viewing window that solves the above-mentioned drawbacks at once.

That is, a pre-formed transparent and tough plastic film that can be heat-sealed and an opaque base material in which window holes of a predetermined size are cut out at regular intervals are placed on a hot roll with convex portions. The method of manufacturing a laminated composite with a viewing window is characterized in that the plastic film is pressed into the window hole of an opaque base material and continuously bonded using the method.

Embodiments of the present invention will be explained based on the drawings. 1st
In the figure, an opaque base material (11) that can be fed out in a long length is continuously fed out, guided through a step roll (2) to a die cutting machine (4) equipped with molds (3) (3) (3'), and then cut into a predetermined shape. Window holes of appropriate size are bored at appropriate intervals.The opaque base material (5) with the window holes drilled therein is again guided to the i-roll (7) (7') via the stepped roll (6). The surface of the heat roll (7) is provided with convex portions (9), and the surface is coated with a resin having release properties, such as a fluorine-based resin such as Teflon or a silicon-based resin. A heat-sealable transparent plastic film (8) is fed to the roll (7) side, and the film is pushed into a window hole made in the opaque base material (5) while being heated by a heat roll +71.
(7'), the two are bonded under heat and pressure. The bonded laminated composite body with viewing window 10) is rolled up into a large roll.

Opaque substrates used in the present invention are not particularly limited, but include papers, nonwoven fabrics, opaque plastic films or sheets, woven fabrics, metal foils (Fe, Cu, etc.).

AI, etc.), plastic foam sheets, etc., or laminates thereof are used. These base materials are used without any treatment, but if necessary, surface treatment may be applied to the surface to be bonded to the transparent plastic film. (4) For example, corona, plasma, sputtering, electron beam, far-infrared heater, flame treatment etc. will be applied. Alternatively, a thermoplastic synthetic resin or the like which can be thermally bonded may be applied to the surface of the base material in advance by extrusion lamination or coating method.

Pre-formed transparent and tough plastic films that can be heat-sealed include, but are not particularly limited to, polyethylene, polypropylene, ethylene-vinyl acetate copolymer resin, "f-lin" (trade name, manufactured by DuPont) )
, EEA, EAA, etc. are used depending on the need.

A conventional die cutting machine is used, such as a vertical type die cutting machine having an upper plate and a lower plate, the lower plate being fixed, and the upper plate moving up and down. Hydraulic type, gear type, and other known means are used as the means for providing the vertical movement. The die cutting machine is usually equipped with a bonding mold that combines concavities and convexities, and the gap between the convexities and convexities is 20
/100 to 5/100, a window hole (11) having a slightly tapered cut end (5) is formed in the base material (1) as shown in Fig. 2, and the subsequent heat In the rolling process, the plastic film (8) is adhered without any gaps. If the gap between the unevenness exceeds 20/100 of the thickness of the base material, the die cutting will not be sufficient and the cutting will be poor. On the other hand, if the gap is less than 57100, the mold will generate heat due to continuous die cutting, causing expansion and deformation. ,
Sometimes the mesh doesn't fit properly. In addition, one of the preferred embodiments is to provide a means for blowing wind pressure to remove the debris that falls onto the lower mold, and to remove and collect the debris.

The heat roll is a pair of rolls +7 to moisten as shown in Figure 3.
) (7') is used. Plastic film (8
) The surface of the roll (7) in contact with the roll (7) is provided with a protrusion (9), and the surface is made of a resin that has mold releasability to prevent the film from adhering, such as a fluorine-based resin such as "Teflon" or silicone. It is coated with resin. The height of the protrusion (9) may be approximately the same as the thickness of the base material (11).Furthermore, by making the shape of the protrusion tapered so that it tends to converge, it can be easily fitted into the window hole. Also, it is preferable because it makes it easier to fit the protrusion along the end surface of the window hole.Furthermore, by shaving off the corner near the top of the convex part (6), the fitting of the convex part into the window hole can be made even more secure. .

When the present invention is carried out continuously, the flow of the film is further stopped during the die-cutting process. Therefore, it is necessary to link the delivery speed, hot roll rotation speed, winding speed, etc. with the mold removal speed. In particular, stopping the rotation of the heat roll causes heat unevenness in the plastic film, impairing the appearance of the finished product and deteriorating its properties. To prevent these problems, step rolls (2) and (6) can be interposed in the middle, and the speeds of each can be adjusted and linked.

As mentioned above, according to the present invention, (1) there is no peripheral edge of the film near the window hole, and the entire surface is covered with the film, so the contents will not get caught (the contents will not get caught); ■ Since there is no bonded edge between the base material and the film, there is no risk of water or dust entering due to poor bonding, and there is no possibility of the contents being exposed or falling out. ■ Unlike conventional products, the flow does not stop when the peripheral edge of the film gets caught (7), so productivity is not only greatly increased, but also suitable for automatic bag making machines and packaging machines. It has many advantages such as being suitable, and its usefulness is extremely large.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing an example of the flow of the manufacturing process of the present invention, Fig. 2 is a schematic cross-sectional view showing one embodiment of the window hole, and Fig. 3 is a state in which the base material and the film are bonded by heat and pressure using a hot roll. FIG. 1... Base material 2.6... Step roll 3.3... Mold 4... Cutting machine 5... Base material with window holes 7.7... Heat roll 8.・Plastic film 9 ・Protrusion 10 ・Laminated composite 11 ・Window hole (8)

Claims (1)

[Claims] 1. A pre-formed transparent and tough plastic film that can be heat-sealed and an opaque base material in which window holes of a predetermined size are cut out at regular intervals are formed into a convex shape. 1. A method for producing a laminated composite with a viewing window, characterized in that the plastic film is pressed into the window hole of an opaque base material and continuously bonded using a hot roll equipped with a window hole. 2. A patent claim in which the mold installed in the die cutting machine is made of a bonding type mold with a combination of projections and depressions, and the gap between the projections and depressions is in the range of 20/100 to 5/100 of the thickness of the opaque base material. The manufacturing method according to item 1.