DE2737018C2 - Process for the production of insert pockets from polyvinyl chloride film on cardboard sheets - Google Patents

Description

20th

The invention relates to a method for producing insert pockets from polyvinyl chloride film Cardboard sheets, in particular for holding postage stamps, postcards or the like, in the case of the film parts cut out in any size and at the same time along at least one of their edges on one Cardboard supports are welded at high frequency to form the insert pockets.

In such a known method (US Pat. No. 3,642,552), the foil parts are welded from Polyvinyl chloride versus plastic films.

It is also used in the manufacture of pocket bags Commonly made of polyvinyl chloride film, adhesive or an adhesive on a carrier, for. B. made of cardboard to apply in order to then place the pockets on the base with the help of this applied adhesive to fix.

The invention is based on the object of providing a method according to the type mentioned at the beginning design that a polyvinyl chloride film or punched parts made of polyvinyl chloride film directly on a Cardboard underlay can be applied or connected to the carrier without the aid of an adhesive can.

According to the invention, this object is achieved in that plasticizer-free polyvinyl chloride film parts are connected during welding with a wood-free, glued cardboard carrier ^{that weighs 200 to 250 g / m 2.}

The method according to the invention advantageously enables plasticizer-free polyvinyl chloride film parts while saving any glue in a surprisingly simple way on a cardboard carrier, like welding onto special cardboard for the production of albums with the formation of pockets. By the cutting of the foil parts to the desired size in the same operation is a very rational & o Production of the insert pockets on neutral cardboard or preprinted sheets, especially a rational one Mass production of cardboard or preprinted sheets with single pockets for postage stamps, postcards or the like possible, in which different rows of pockets have any shape the neutral cardboard or preprinted sheets are provided.

The use of a plasticizer-free polyvinyl chloride film requires a good spring effect of the welded, relatively stiff foil parts, whereby postage stamps and the like deposited in the pockets are held particularly well.

The method according to the invention will now be explained with reference to the drawings. In the latter are

F i g. t is an elevation view of a device for carrying out the method according to the invention,

Fig. 2 is a perspective view of a cutting tool the device of Fig. 1, wherein the cutting tool along the front cutting edge as Spot welding electrode is formed and

Figure 3 is a plan view of a series of on • On a pre-printed sheet with the formation of pockets welded film parts.

As shown in Fig. 1 shows, cutting tools 1 with any cutting edge contour corresponding to the size of the insert pockets 2 to be produced (FIG. 3) for postage stamps, postcards or the like are attached to a suspension device 9 which can be moved to and fro with respect to a support table 7 (arrow directions A and B) and serve as welding electrodes 5 (FIG. 2), which can be heated by a heater 3 located in the suspension device 9. The support table 7 serves as a counter electrode and receives a carrier 6 made of cardboard and a plasticizer-free PVC film 8 on the latter. If the cutting tools 1 come into engagement with the PVC film when the suspension device 9 moves against the support table 7, the corresponding film parts are cut out of the PVC film 8 by the cutting edges 10 of the cutting tools 1 and certain binding and Adhesive activated at the same time when heated by the high-frequency current surge of the welding electrode parts 5 of the cutting tools 1 in such a way that at least along one edge of each cut-out foil part 2 a welded connection of foil part 2 and cardboard 6 is produced to form the insert pockets.

F i g. 2 shows a perspective view, seen from below, of one in the suspension device 9 usable cutting tool 1, the latter along the front cutting edge 10 as a spot welding electrode 5 is formed, by means of which the lower edge of the cut-out PVC film in FIG is web and spot welded to the carton 6, while the upper part 11 of the formed in this way Insert pocket can be applied resiliently against the cardboard box. By using multiple rows of cutting tools 1 different cut edge outline according to the desired size of the one to be produced Insert pockets it is possible to simultaneously have several rows of insert pockets 2 on one preprinted sheet 6, as shown in FIG. 3 is shown in plan by way of example on a number of pockets.

The following table shows two examples of black and chamois album cardboard, like the one in the Process according to the invention is used, and suitable process parameters emerge.

1. Black, wood-free, glued album cardboard weighing 200-250 g / m ²
Welding time: 0.5 seconds.

Welding performance: HF level 2

Pressure: 60 kg

Electrode temperature: 150 "C

2. Chamois wood ?; 2i glued, 20ΰ -250 g / m ² heavy album cardboard

Welding time: 4.5 seconds

Welding power: 24 kW

Pressure: __ 450 kp

Electrode temperature: 150 ° C

For this purpose 3 sheets of drawings

Claims (1)

Claim: A method for producing insert pockets from polyvinyl chloride film on cardboard sheets, in particular for holding stamps, postcards or the like, in which film parts are cut out of any size and at the same time welded at high frequency along at least one of their edges on a cardboard carrier to form the insert pockets, characterized in that, that plasticizer-free polyvinyl chloride film parts with a 200 to 250 g / m ² heavy, wood-free, glued cardboard carrier are connected during welding.