DE2246185A1 - Continuous prodn of foam with facing sheets - endless belts moulding unfac-ed sides of foam being continuously brushed to obviate temporary coverings - Google Patents

Abstract

An appts for the continuous production of a prismatic section or bar of foam, esp polyurethane, with some of its sides (upper and lower sides) faced with sheet or boarding, comprises a continuous mould with upper and lower endless belts, and also with lateral endless belts. On the return side of each lateral endless belt, >=1 cleaning devices, esp comprising revolving brushes, are provided so that the belts are continuously cleaned before being re-used. Pref both the mould faces and also the upper and/or lower edges are brushed.

Description

Device for the continuous production of a laminated foam strand, in particular from. Polyurethane The invention relates to a device for continuous Production of a laminated foam strand, in particular from polyurethane, in one of the upper and lower bands as well as laterally moving limiting bands existing double belt system.

Such devices, the essential part of which is the so-called Forms double belt system are known in a wide variety of designs. the lateral delimitation ligaments, which are often formed in the upper and lower ligaments Space protrude and in this space for the production of show fabric strands of different Are adjustable in width, are formed by rotating and rotating chains, as they are also known in conveyor technology.

It is also known to produce laminated foam strands. For example, one side of the foam strand can have a solid cover layer and the other side can be covered with a flexible film or paper. In order to allow the foam mass to stick to the side while reacting To prevent boundary tapes, it is known to insert strips of paper at the side, which have to be removed from the end product. It is also possible to do this Lateral protection of the lateral limiting straps by folding over the upper or to form the lower lamination material in a U-shape. By this protection the lateral limitation ligaments is a relatively large additional machine Effort required.

It is also often difficult for a clean and wrinkle-free guide the side strips of paper or the like.

The present invention is based on the object of a device he initially mentioned type to create in the side strips of paper or the like. are not required to protect the lateral delimitation tapes.

This object is basically achieved in that in the area of Return of each lateral boundary band one or more cleaning devices preferably with rotating brushes is provided.

The fact that the lateral delimitation belts in the area of their return are cleaned, clean boundary strips always get into the area of the mold space, in which is foamed.

Advantageously, not only by brushing or the like.

cleaned, but a release agent is applied at the same time, For example, sprayed on, the sticking of the fully reacting fluff mass prevented.

In a particularly advantageous manner, the release agent is applied before cleaning brought through the cleaning facilities, so that the cleaning facilities also ensure a good and even distribution of the release agent.

It has proven to be particularly advantageous in connection with the cleaning facilities with revolving and rotating brushes, the lateral boundary strips by forming plate chains, the plates being made of an elastic plastic are made. This elastic plastic can be cleaned and guaranteed together with the upper and lower belt of the double belt system for a good lateral Sealing even without the use of paper strips on the side.

Further advantages and details of the invention will follow in the following explained in more detail with reference to the drawing using an exemplary embodiment, It shows.

Fig. 1 is a plan view of a double belt system for a device according to the invention, wherein the upper belt is shown; and FIG. 2 shows a section according to the line 2 - 2 of the Big. 1 - on a larger scale.

In the plan view of Fig. 1, the side limits are the 1 and 2 can be seen if the upper strap is missing. These lateral boundary bands are running around pulleys 3 around, which are driven.

In the return area of the lateral limit bands are for each of these lateral boundary strips 2 cleaning directions 4 and 5 or 6 and 7 provided.

In the direction of movement in the area of the return of each lateral boundary band there is a release agent application station 8 and in front of the first cleaning device 90 Each cleaning device has two on the outer surface of the associated boundary tape adjacent brushes 10 and 11 disengaged. The upper and the lower, narrow outer surface the lateral boundary tape is also cleaned by brushes, of which overhead brush 12 is illustrated.

The brushes are pivotably mounted on lever arms 13 so that they can be pressed or swiveled back as desired.

The brushes are driven to rotate, so that the cleaning is brought about There is a relative movement between the brush surface and the lateral boundary band is.

In a housing 14 are the drive, gear and other control and control devices for the cleaning equipment.

If a lateral delimitation belt is the mold space of the double belt system has left and has revolved around the associated pulley, then in the release agent application station 8 or 9 released release agent. Connect with it cleaning takes place on one or more cleaning devices 4, 5 or 6, 7 Cleaning equipment, the release agent is evenly distributed at the same time. The direction of production in the area of the mold cavity is marked by the arrow P.

In Fig. 2 is a contracted section through the flow and return a lateral boundary tape shown. The side boundary tape 2 is formed by plates made of elastic plastic. These plates are on metal plates 15 attached. The metal plates 15 are connected to a chain link via a web 17 16 connected which is supported on all sides by rollers 19 in a part 18.

As becomes clear when looking at FIG. 2, the one with muddy material 23 filled mold cavity by upper belt 20 and lower belt 21 as well as the one shown lateral boundary tape 2 formed. Interchangeable wooden blocks 24 on the upper belt 20 are used to adjust the height of the mold cavity. A lamination takes place with a lower rigid cover layer 22 and with a thin, flexible film 25 in the upper area of the foam strand.

In the area of the return of the lateral limiting tape (left in Fig. 2) are the side brushes 10 and 11 and the bottom of the plate Plastic-fitting brush 12 is illustrated. All brushes are in different Levels to avoid mutual obstruction and overlap.

Claims (5)

P a t e n t a n sp r il c h e ½). ~ Device for the continuous production of a laminated Foam strands, in particular made of polyurethane, in one of the upper and lower bands as well as a double belt system on the side with running boundary belts, thereby characterized in that in the area of the return of each lateral limiting band (2, 3) one or more cleaning devices (4, - 8), preferably with rotationally driven ones Brushes (10, ll) are provided. 2. Apparatus according to claim 1, characterized in that each cleaning device - (4 - 8) with side and top and bottom of the assigned limiting tape (2, 3) adjacent brushes (10, ll, 12) is equipped. 3. Apparatus according to claim 1 or 2, characterized in that In the area of the return line of each lateral boundary belt (2, 3) a separating center feed station (8, 9) is provided. 4. Apparatus according to claim 3, characterized in that each release agent application station (8, 9) in relation to the direction of movement in the area of the return of the associated lateral boundary strip in front of the associated cleaning device (4 - 8) is. 5. Device according to one or more of claims 1-4, characterized characterized in that each lateral delimitation band (2, 3) by one on all sides mounted chain (16) is formed on which the limiting band (2 or 3) forming elastic panels are attached, the outer surfaces of the associated cleaning equipment (4 - 8) are facing.