JPH0344655B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Technical Field> The present invention relates to a method for automatically distinguishing the front and back sides of a multilayer foam sheet having a laminate film or the like on one side, and is a method that can easily distinguish between the foam sheet side and the other side.

<Prior art> Foamed sheets, such as expanded polystyrene sheets, have conventionally been used not only as single-layer sheets, but also as multilayer laminate sheets having other layers such as a laminate film layer, an aluminum foil layer, or an aluminum vapor-deposited layer on one side. are becoming more common. When such laminated sheets are made into sheet pieces of appropriate dimensions,
If the front and back sides are individually determined in advance and stacked, it will be easier to use for the next processing, but if the front and back sides are stacked indiscriminately, it will be necessary to distinguish between the front and back sides in the next processing line. come. To give an example where it is necessary to distinguish between the front and back sides, as shown in FIG. 8, in a trimmed loss sheet of a foamed polystyrene sheet after sheet molding for containers, etc., there is an uncolored part 100 made of a foamed polystyrene layer, and another part made of a laminate film, etc. When the layer portion 200 (often a printed or colored layer or a printed and colored layer) is separated by cutting in the horizontal direction C-C', the laminate film is separated at the cutting position relative to the overall layer thickness. The thickness of the foamed polystyrene layer and the foamed polystyrene layer are not equal, and the cutting blade must be positioned at an uneven position. I'm going to go crazy at the top.

<Purpose> Therefore, in view of the above-mentioned conventional situation, the purpose of the present invention is to make it possible to reliably distinguish between the front and back sides of the foamed sheets that are supplied indiscriminately in the middle of the processing line. I'm trying to provide a method.

<Structure> The method for achieving the above object is to pass a foamed sheet with a laminated film or other heterogeneous layer laminated on one side between rotating rolls for discrimination to determine the difference in physical properties between the front and back sides of the sheet. This is a method for automatically determining the front and back sides of a multilayer foam sheet, which is characterized in that the front and back sides of the sheet are automatically determined by using the following.

<Example> Next, according to an example of the present invention, a case where an implementation device for distinguishing front and back sides is used in a separation device for foamed polystyrene sheets will be illustrated with reference to the drawings.

First, FIGS. 1 and 2 illustrate examples of material sheet pieces A to be used. The material sheet piece A is a printed or colored layer of the laminated film 20 on one side, or a printed or colored layer. A case will be described in which a foamed polystyrene sheet 10 having a colored layer (hereinafter referred to as a "printed colored layer" for convenience) is used.

As the material sheet piece A, a trimmed loss sheet after sheet forming as shown in Fig. 1 is used.
For example, holes with clamp marks 1 remain in the trimming loss sheet on both sides in the longitudinal direction.

Then, as shown in Figure 2, laminated film 20
Of the layers, the printed colored layer portion 20a is the inner surface facing the expanded polystyrene sheet 10, and the film includes various laminate films.
polystyrene, polyethylene, polypropylene,
Other non-foamed synthetic resin, aluminum foil, and a binder layer between the foamed polystyrene sheet (for example, if the film is polyethylene, EVA, etc.)
Sometimes it is laminated with a . When the printed colored layer portion 20a is a colored layer, the coloring of the layer of the laminate film 20 is transferred or permeated into a portion of the uncolored expanded polystyrene sheet 10 due to the solvent effect of the printing ink. (approximately 50μ), when separating the colored layer and the uncolored layer, the layer of the laminate film 20 containing the expanded polystyrene sheet layer part 10a penetrated with the coloring, and the uncolored layer. A cutting blade for slicing is used to cut the foamed polystyrene layer 10b at the position C-C'. Here, if the thickness of the material sheet piece A is about 1.5 to 5.2 mm including the laminate film 20,
The laminate film side containing the expanded polystyrene layer penetrated by the colored portion is separated by 0.2 to 1.6 mm, and the uncolored expanded polystyrene layer is separated to approximately 1.3 to 3.6 mm. As a result of the above separation, the layer of the laminate film 20 is separated into a layer of the laminate film 20 that includes the expanded polystyrene sheet layer 10a that has been penetrated with coloring, and an uncolored expanded polystyrene layer 10b that has not been printed or colored. It will be possible.

Next, the apparatus of the present invention shown in FIGS. 4 and 5 will be sequentially explained.

From the hopper 30 in the supply section shown in the figure, the material sheet piece A enters the vibrating hopper 31, which is driven by a blower 35 which serves as a suction section.
The material sheet piece A is conveyed upward by hooking the needle 32 onto the surface of the material sheet piece A using the needle belt 33 while air is suctioned by the needle belt 33. As shown in FIG.
In the case of a book, the needles 32 are installed with a pitch of 1.5 m and are shifted by half a pitch on both lines. The length of the needle belt 33 is more than 3.0 times that of the material sheet A.

Reference numerals 36 and 36 refer to pull-up rolls, one or both of which are sponge rolls, one of which is used as a slide shaft and pushed toward the other using a spring or the like to prevent the material sheet piece A from sliding sideways. The speed of the pulling rolls 36, 36 is determined by the needle belt 33.
Make it faster than Direction change guide 34 is 500
The height of mm is taken to create a streamlined curve. 37
is a blower that supplies air into the guide 34 to facilitate direction change. 38 is the intermediate guide cylinder, which is angled at an angle of about 20 degrees or more, and it is recommended that a fluororesin sheet be pasted on the inner surface to prevent it from adhering to the material sheet piece A, or that the surface be treated with fluororesin. Although it is convenient, the guide tube 38 can also be omitted.

The determining rolls 40, 40 in the determining section, which is the key point of the front/back discriminating method of the present invention, are made of metal or rubber, both of which are made of the same material and driven either on one side or at the same speed. In addition, the upper and lower guide tubes 41 and 42 have their entrances located slightly away from the center of the rolls 40 and 40, and in the upper twist-type guide tube 41, the material sheet piece A is rotated clockwise, for example, by 90 degrees. It is twisted by 90 degrees and sent to reversing rolls 43, 43, and then twisted 90 degrees clockwise by a twist-type guide tube 41', turned inside out, and sent to reversing rolls 44, 43.
44 and further to the straight tube guide 45, whereas in the lower guide tube 42, the material sheet piece A is fed as it is without being twisted. In order to feed the material sheet piece A, it is preferable that there should be a distance of about 500 mm or more between the intermediate rolls 43', 43' and the judgment rolls 44, 44 and the feed rolls 44, 44.

Then, the material sheet pieces are indiscriminately introduced into the judgment rolls 40, 40 by the judgment rolls 40, 40, taking advantage of the difference in surface conditions such as the coefficient of friction between the laminate film 20 side and the foamed polystyrene sheet 10 side. Determine whether A is front or back. That is,
Assuming that the laminate film 20 side is the front side, if the material sheet piece comes in with the front side facing up, the material sheet piece will be compressed and curled by the determination roll. At this time, since the friction coefficient of the laminate film 20 of the material sheet piece A is smaller than the friction coefficient of the foamed polystyrene sheet 10, the foamed polystyrene sheet 10 side is sent to the downstream side earlier than the laminate film 20 side, so that the film is always It will curl to the side and lengthwise and curve up. Conversely, even if the film passes through the judgment rolls 40, 40 with the front side facing down, the result is that the film curls and warps in the length direction toward the film.

In FIGS. 4 and 5, 50 is a cutting blade, and this cutting blade 50 is a filtering blade that rotates endlessly in a direction perpendicular to the feeding direction of the material sheet piece A, and its cutting edge is exactly It has been adjusted in advance to a suitable position for slicing. Further, reference numerals 60 and 60' denote crushers in the collecting section, each for crushing the material sheet pieces A after separation.

According to the above structure, the material sheet piece A made of the trimming loss sheet is conveyed upward from inside the vibrating hopper 31 through the supply hopper 30 in the supply section by the belt 33 with needles 32, and then transferred to the curved direction change guide 34. and is sent to the judgment rules 40, 40 side in the judgment section.

Here, if the material sheet piece A passes through the determination rollers 40, 40 with the front side facing up, the material sheet piece A
The laminate film 20 side will warp, so
The film is fed through guide cylinders 41 and 41' on the upper stage of the apparatus, which are twisted by 90 degrees, to a cutting blade 50 that serves as a separating section, with the front and back reversed, that is, with the film side facing down. On the other hand, when material sheet piece A passes through the judgment rollers 40, 40 with its front side facing down, the laminate film 20 side of material sheet piece A will warp upward, so it will continue to pass through the direct feed type guide tubes 42, 42' in the lower stage. It is fed to a cutting blade 50 that serves as a separating section.

After separation, each sheet is sent to separate crushers 60, 60' of the recovery section, crushed, pneumatically transported, and recovered to a recovery hopper (not shown).

By slicing with a cutting blade at a predetermined position as described above, it is possible to reliably separate the uncolored expanded polystyrene layer 10 from the laminate film 20 layer, which is a different layer. The printed surface and colored parts of the foamed polystyrene sheet can be recycled separately to avoid mixing during recycling, and the material quality of the recycled product can be stabilized.

In particular, when the printed colored layer is a laminate film layer, the laminate layer includes a part of the expanded polystyrene layer to which the printed surface or colored part is transferred or permeated, and the part that is not printed or colored. By separating the foamed polystyrene layer, the uncolored foamed polystyrene sheet can be reliably separated from other colored parts, especially the laminate film made of a different material, and it is also convenient for reuse after separation.

Therefore, in the above case, the reuse rate of the uncolored layer having a high layer thickness ratio among the expanded polystyrene sheets increases, and the economic advantages are also significant.

In addition to the above-mentioned trimming loss sheet, examples in which the determination method of the present invention is applied include cases in which the sheet is warped in the direction of warping or due to the difference in speed due to the difference in physical properties between the front and back sides of the sheet due to passage between rotating rolls in the determination section. This means that the front and back sides of the sheet can be automatically determined.

As shown in FIG. 6, another embodiment of the determination unit is to use the peripheral speed difference between the roll 40 and the roll 40' to determine whether the material sheet piece A is fed with the laminate film 20 side facing up. , a predetermined interval l after passing the rolls 40, 40' on the back side.
There is also a method of electrically determining the time difference.
In this case, a gate 46 is provided which electrically operates to determine which of the upper and lower guide tubes to enter after the determination.

As a further example, as shown in FIG.
If the side of the laminate film 20 is determined to be the front side (top), it is placed in the upper feeding area M, and if the laminate film 20 side is determined to be the back side (bottom), it is placed in the lower feeding area N. If the separation positions are individually adjusted to be the same for the upper and lower cutting blades 50, 50, the guide cylinders 41, 41' for twisting 90 degrees as in the previous embodiment are not necessary.
Direct feed guides 47, 48 and direct feed rolls 49, 4
9 is a good thing. In this embodiment as well, the determination rolls 40, 40 may be of any type that can perform the same determination as in the previous embodiment. In the figure, reference numeral 80 indicates a collecting section including the separated laminate film 20;
0 is a collection section of uncolored expanded polystyrene.

In the above case, the foamed polystyrene sheet in which the printed colored layer portion 20a is formed on one side of the single-sided laminate film 20 is used as the material sheet piece A. As shown in Fig. 3, an aluminum foil layer or a vapor-deposited aluminum layer 10c is formed on one side of the foamed polystyrene sheet 10 directly or via a binder layer 10d as a heterogeneous layer. If the material is supplied to the separating section with the material facing downward, the foreign layer 90 and the uncolored foamed polystyrene layer 10b can be reliably separated by cutting at the C-C' position.

In addition, the separation method can be applied to sheets other than trimmed loss sheets (for example, molded test sheets, dirty sheets, etc.), and if the form is difficult to start from the supply section of the device described above, it can be applied directly to the separation section. It is also possible to manually feed and separate.

Further, in either implementation, the expanded polystyrene sheet is separated to the exclusion of other layers.

<Effects> The method for determining the front and back sides of a sheet according to the present invention makes it easy and reliable to automatically determine the front and back sides of a multilayer foam sheet that has a laminate film or the like on one side, and the front and back sides can be specified by introducing the method to the processing line. This will be extremely useful for processing.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an example of a foamed polystyrene sheet determined by the method of the present invention, Fig. 2 is a partially enlarged sectional view of the same sheet, and Fig. 3 is a partially enlarged sectional view showing an example of a modification of the sheet. , FIG. 4 is a schematic side view showing an example of the implementation device, FIG. 5 is a schematic plan view of the same device, and FIG. 6 is a side view of the determination portion of the change device.
FIG. 7 is a side view of the determination and separation portion of the changing device, and FIG. 8 is a schematic sectional view illustrating the separation of the multilayer foam sheet. A... Material sheet piece made of foamed polystyrene sheet, 1... Clamp marks, 10... Foamed polystyrene layer, 10a... Part of the foamed polystyrene layer to which coloring etc. has been transferred or permeated, 10b... Foamed polystyrene layer that remains uncolored, C- C'...Separation position, 40,4
0... Judgment roll, 50... Cutting blade.

Claims (1)

[Claims] 1. A foamed sheet with a laminated film or other heterogeneous layer laminated on one side is passed between rotating rolls for identification, and the front and back of the sheet are automatically determined based on the difference in physical properties between the front and back sides of the sheet. A method for automatically determining the front and back sides of multilayer foam sheets.