DE1479440B2 - PROCESS FOR MANUFACTURING SEMI-RIGID OR RIGID PLASTIC CONTAINERS - Google Patents

Description

The invention relates to a method for the production-side adhesive connection prepared and from the Ab-

len of semi-rigid or rigid plastic containers fall the individual films separately and if necessary

become disoriented from one made up of several plastic sheets.

Multi-layer web in which at least one poly- An improvement of this process consists in

styrene film and at least one plastic film against one another 5 that before pressing the films together on the

surface of one of the surfaces that is otherwise adhered to form the multilayer web and treated to form an adhesive bond

presses, partial areas of the multilayer web in the Ge foils a plurality of square or round,

the container is pressed and the shaped containers act on both surfaces for adhesive bonding be separated from the multilayer web. ' delter plastic film inserts centrically in each of the

and the separated waste is removed. Method 10 to the containers to be pressed parts of the

of this type are known. Multi-layer web is applied.

The costs per unit weight of a plastic film. This method according to the invention offers special features does not directly depend on its thickness. So their advantages, where it is expedient, at an additional cost z. B. to use a single-layer film with a thick layer sheet films of different colors 0.76 mm more than one of three 0.254 mm thick 15 den. It has been found that with a sharp Layers of film. It can thus be bent, such. B. to a small role or a Save substantial material costs when two or more edge, oriented laminated films are separated thin foils can be separated into a multilayer web. Such can be the case with what is desired Total thickness to be laminated. Put any waste that arises during the manufacture of the containers into the separated from containers, in particular from individually colored components and each one-time use of disposable containers, such as close-up reclaimed and optionally desiccant containers made of foils, also represents which are oriented.

Recovery of the punching waste an important detail in the process according to the

economic factor. The lamination of Fo- invention first two or more to be laminated

lien through the use of an adhesive is after 25 foils a high-voltage corona discharge

partial, as the adhesive exposes the recovered waste to surfaces to be joined together,

contaminated and worthless and renders the cost on the treated surfaces of two or more

Because of the application of the adhesive, the solution foils are then by means of printing plates or

medium distance etc. can be increased. Pressure rollers for the purpose of developing the block binding

Two or more foils are pressed together on top of one another without the extension. This bond holds the slides in place

to form a noticeable bond is sufficient as long as they are not through

not that the desired container is not warped from loosely to- an excessive bending stress

brought together foils can be deformed. will. The multi-layer web preformed in this way can

In the attempted deformation, the then distorted by blow molding, mechanical thermal

Parts, the container produced contains bubbles, and 35 deform or deep-draw deformed into a container

the slides will separate in different areas. Optionally, blanks such as discs

from each other. or other forms that differ from the multilayer

The invention is based on the object in the cut and then for the production of the frame a method of making rigid containers can be used. There is an advantage or semi-rigid container both improvements of the 40 when from a reduction in shipping costs, though physical properties as well as a host- the blanks for forming into the end product to achieve more economical production. be transported to another location.

Polystyrene and some other plastics tend to be suitable for performing the procedure

Shape of plates or foils for blocking, d. H. all thermoplastic films used in the treatment

for binding with an adjacent film. Block these neighbors by corona discharge. This proprietary

supply increases if the surfaces of such shafts have oriented polystyrene, polyethylene,

Plastic films ζ. B. by corona discharge, Flam rubber hydrochloride and vinylidene chloride. It

or acids have been treated. If one is further possible, thermo-

Polystyrene film subjected to a corona discharge to block-connect plastic materials, such as B. Poly-

and then rolled up or stacked, styrene with vinylidene chloride polymers and copoly-

the surfaces lying on top of one another are bonded to one another or to polyethylene.

or block; They can then no longer work together. Instead of the corona discharge, others can

can be separated without damaging the foils

genes to tear them down or even to tear them apart. Surfaces, such as acid or flame treatment

The invention is based on the knowledge that 55 ment are used. In general, it was

this so far found in the manufacture of containers that the treated surfaces also

Films made especially from biaxially oriented polystyrene can be made hydrophilic. Whether this effect, however

a property that is considered disadvantageous is advantageous essential or merely incidental, remain open,

in a process for the production of semi-rigid or in the process step of surface treatment

can incorporate rigid plastic containers. 60 lung, like ζ. B. through the preferred corona development

On the basis of this knowledge, that of the charge, it is essential that the surface of the film The task on which this is based is clean and free of foreign matter. Dust or oil driving of the type described above according to stains on the film to be treated lead to the invention solved in that before the together an incorrect binding, even if the The polystyrene film biaxial 65 Corona treatment is otherwise satisfactorily fully oriented is, the upper to be pressed on each other has been carried out.

surfaces of the foils by treatment with Co- It is also essential that the surface is opposed to

corona discharge, acid or flames for a uniformly exposed compared to the corona discharge, see above

3 4

that a uniform F i g. 3 is a side elevation, partly diagrammatic, Bond is created. It should be noted that all with one device for carrying out the method the other surfaces to be connected are treated with three plastic foils;

must if the full effect of the procedure F i g. Figure 4 is a side elevation of a container to be co-attained. Although a certain bond can occur by means of an aligned, square, adhesive bond when only one of the plastic film insert to be connected has been produced and the surfaces are treated, the one between two outer films is usually arranged;
Bond weak and inconsistent. A f i g. Figure 5 is a side elevation view of a container which, with some inconsistency, may be seen on optical of an aligned, circular, bonded examination. Such a plastic film insert has been produced, but not necessarily disadvantageous because it is arranged between two outer films.
Pressure deformation to the container each under- In detail, FIG. 1 diagrammatically eliminates a pre-worked binding and completes the block binding direction for adhesive binding and unraveling. The multilayer web should be in the waste pieces. Plastic foils 1 and 2 lie as a clean, dust-free environment processed 15 rolls of good on rolls 3 and 4. Both plastic foils 1, 2 can be of the same thickness to avoid contamination of their surfaces, or a foil and the formation of the desired can be thicker than the other to be guaranteed, depending on the ge-block binding. desired thickness of the multilayer laminated web.

The surface properties of the thermoplastic Both rolls 3, 4 are unwound together

see slide learn during treatment how ao and gauged.

exposure to the corona discharge, the plastic sheets 1 and 2 become simultaneously

significant changes. Untreated over- a device 5 for the corona treatment to-

surfaces have essentially no ability to indicate where their surfaces are exposed to a high tension,

to adhere to each other. If the surfaces are subjected to the high frequency corona discharge

thermoplastic films of the corona discharge. For this purpose, the foils 1, 2 run within the

are set, the same experience, however, an uplifting device 5 over large roles 6 and 7.

ability to create an adhesive bond to one another, electrodes 8 and 9 are arranged to these,

walk. Such by the corona discharge through which the inner surface of each film 1, 2 for

conditional change in surface properties exposes the attack of the corona discharge,

leads to the formation of a strong bond between the 30 The distance between the electrodes 8, 9 and

see the surface of the film 1 or 2 to be treated that has been treated by the corona discharge

Surfaces when pressed together. This should be uniform across the width of the foil

Interfacial adhesion is sufficiently strong to ensure uniform treatment. the

Forming and manufacturing process of the thermo-perpendicular distance between the electrodes 8, 9

plastic film to survive, however, the bin 35 and the film 1, 2 can fluctuate somewhat. Have so

If necessary, by bending the film strongly, distances of 0.075 to 0.254 mm are suitable

be canceled again. proven to be satisfied at 3000 volts and 3000 c / s-

The multilayer web can produce two or more results if biaxially oriented

Foils are produced. The thickness of each film can be treated with polystyrene. Higher or lower

different so that a multilayer web 40 voltages and frequencies can be applied

any desired thickness through the selection of foils. Direct current can be applied, however

corresponding thickness can be produced. for reasons of operator safety, the

The application of high-frequency alternating current produced from the multilayer webs Containers preferably have improved mechanical properties. The high-voltage corona discharge compared to the same 45 from a single film forces the treated surfaces of the films 1,2 Thick manufactured on. Polystyrene containers, for example, have the property of opening when they are squeezed together which block from two foils with a thickness of 0.38 mm. It has been found necessary to that have been manufactured to be 10 to 15% higher perpendicular to the two upper right that come into contact with each other than similar containers that are to be treated from one surface of the foils 1, 2. The corona single-layer Foil with a thickness of 0.76 mm 50 treatment of only one surface usually leads have been manufactured. not a satisfactory bond.

During the deformation, the film is on the After the surfaces of the films 1, 2 of these normal deformation temperatures. It appears to have been subjected to corona treatment, however, that the foils from which the containers are made are fed to a pair of pressure rollers 10 are not completely welded, but see which the films 1 and 2 are pressed together to be bound in a similar way. These will. The goodness of attachment or attachment Binding together with that by the geometric also depends on the exclusion of air from the Outline shape of the container caused rigidity versus the interface and the impingement with one prevents a separation of the foils with the normal reaching pressure. Although the Corona-Ent-use and leads to the improved strength. 60 charge associated with an increase in temperature

The execution of the procedure will be as follows, the procedure will be essentially carried out for example with reference to the drawing for room heating, which alone does not explain is sufficient to thermally weld the

F i g. 1 is a side elevation, partly diagrammatic, of securing foils 1, 2. However, it has been shown that

a device for performing the method 65, a pressure of the pressure rollers 10 of about 1.8 to

with two plastic sheets; 2.6 kgf / cm gives satisfactory results.

Fig. 2 is a side elevation, partly in section, of one The pressure exerted depends on the type of the den

container made of two foils; Foils 1, 2 fed to pressure rollers 10. One of the

Claims (2)

5 6 Pressure rollers 10 should preferably be made of rubber or then a molding press 27 or a consist of another elastic material. The other molding tool is fed to the container Affinity of those treated with corona discharge develops. The resulting waste path is Surfaces opposite similarly treated upper then passed over a narrow roller 28, where the surfaces binds the foils 1, 2 strongly to one another. The 5 webs are sharply bent and their binding is broken laminated foils 1,2 cannot be done by hand without. A driver roller 29 acts for this purpose with the Tearing, damaging or other blemishes roll 28 to bend the waste sheet together, the surfaces are pulled apart. Then each of the resulting individual The adhering, aligned multilayer web is laid on take-up rolls 30, 31 and 32. then introduced into a compression molding press 11, in which the io is wound. desired container is produced. The Compression Press Like the F i g. 4 shows, a container 33 can with 11, during the deformation, separates the container from a ribbed pattern that is colored the multilayer web so that it can be at the verge. Such a pattern 34 is made by running in Accruing residues in the form of a continuous set of a small square plastic olienlichen Incurred web. 15 insert designed for a corona treatment After the deformation, this waste has been subjected to one so that it is between the small roller 12 guided around these block-bound plastic films when they are pressed together Waste path is sharply bent. For this purpose, it is bonded between the pressure rollers 26, the roller 12 a driver roller 13 together. The square plastic film inserts are in The sharp bending creates the bond between 20 distances from one another along the length of the multiple denatures Films 1 and 2 of the multilayer web lifted. layer track used, and the diagonal dimension The foils are separated from each other. Because the ab- of each square is smaller than the diameter of the fall in the form of a continuous web in front of the edge 35 of the container. It was found that is, each web can separately on take-up rollers under pressure the weakest parts of the container 14 and 15 are wound up. Should it be necessary to lie along its lower side walls. The pattern The separate webs can be heated by 34 thus not only leading to a decorative curling device be carried out for the purpose of lifting, but also to consolidate the container, their orientation. Because of the thinness of the individual further decorative effects can through With tracks, heat transfer is cheap and it is costly to stack different squares 30 targets are to be used for disorientation, e.g. B. 45 ° offset from each other small amount. are, or by placing a washer between the outer ones In Fig. 2 is a semi-rigid food container film is used. In FIG. 5 is a container ter 16 is shown as a throw-away cup, which is shown after the 37 which has a disc insert 38 between drive has been established. The sides 17 of the bed the outer foils have been made. The Hafthalter are ribbed to give strength in the plumbing 35 bound insert should for satisfactory erect and the resistance to a result aligned with respect to the shape arranged To improve crushing. will. The rim 18 at the top of the container is a practical area of application is in Flange-like outward, so with a production of an attractive container for the Lid to be engaged. 40 Protection of light-sensitive content. So z. B. a The foils 1 and 2 are in the drawing amber-colored containers made of a colored one exaggerated shown thick, so the two roles 1,2 sheet 1 and a clear sheet 2 from to show in the container. In reality the oriented are composed of polystyrene. To Films 1, 2 are so tightly bound together in blocks that the pretreatment, the adhesive bond and the the container as from a single plastic sheet 45 can be molded from the waste web with the help of the appears shaped. Roller 12 and the carrier roller 13 add the remnants For the manufacture of objects from three foils are recovered. is the device shown diagrammatically in FIG. 3 The additives of many plastics consist of serviceable. Rolls 19, 20 and 21 are arranged in such a way - components that are not used for the packaging of Nahnet, that plastic films 22, 23 and 24 of these 59 funds may be used. It is with are removable. Any slide. At the same time, the procedure makes it possible to set up a for these purposes Device 25 for surface treatment of hardened plastic, such as oriented polystyrene, in which they turn to a high-tension, high-frequency, the physical barrier between th corona discharge. The uptake of the food content and a plastic Foil 22 can only be turned on its lower surface 55 which is not treated with the food. The intermediate film 23 is allowed to come into contact on medium, corona treatment on both surfaces thrown, and the lower slide 24 is only based on its' claims: treated upper surface. For lamination, several 1. Method of making semi-rigid More foils are only made from the outer ones on their 60 or rigid plastic containers inner surfaces are treated, and the multilayer foils existing between several plastic foils are treated on a double-layer web in which at least one is made of polystyrene Surfaces; unless for special purposes, foil and at least one plastic foil aneinwie e.g. for printing, the outer surfaces: - on the other hand to the multilayer web - together hydrophilic be made. / 65: After the corona treatment, the foils are: pressed into the shape of the container and the 22, 23, 24 when passing between two "formed" containers made of the multilayer web Pressure rollers 26 blocked. The blocked sheets are torn out and the separated case is removed, characterized that before the foils are pressed together, the polystyrene foil is biaxially oriented, the one to be pressed onto one another Surfaces of the foils through a treatment with corona discharge, Acid or flame prepared for a mutual adhesive bond and from the waste the individual foils are separated and possibly disoriented. 2. The method according to claim 1, characterized in that prior to compression of the foils on the surface of one of the foils treated for adhesive bonding a plurality of square or round plastic film inserts treated on both surfaces for adhesive bonding centrally in each of the sub-areas of the multilayer web to be pressed towards the containers is applied. 1 sheet of drawings 109519/295