RU2400355C1 - Method for manufacturing of lined bent part of facade - Google Patents

Abstract

FIELD: wood working industry.

SUBSTANCE: invention relates to wood working industry and technologies of furniture production, in particular to technologies of manufacturing and lining of facade surfaces of furniture sets. When stock is made, external layer is made of material, having longitudinal slots to provide for the possibility of bending. One of inner layers is arranged as composite, at least from two parts, one of which - smaller one - is arranged and glued along end of part stock to surface of external layer with further milling to form curvinear profile of end surface of part, and the other one - larger one - is arranged and glued to external layer of stock at the side of longitudinal slots with simultaneous bending of the whole part after lining. Lining of external layer and end surface of part is carried out with shaping plastic.

EFFECT: invention provides for the possibility to produce end surface of curvilinear profile lined with shaping plastic, with application of post-forming technology.

2 cl, 5 dwg, 1 ex

Description

The invention relates to the woodworking industry and technologies for furniture production, in particular to technologies for the manufacture and cladding of facade surfaces of furniture sets. The inventive method can be applied in the manufacture of, for example, kitchen furniture, lined with plastic with bent-glued doors.

A known method of manufacturing bent-glued parts, for the implementation of which form a package of two blanks of particle board with a thickness of 3.2 mm and one or more blanks of peeled veneer up to 1.5 mm thick. Then, the adhesive base is applied to all the surfaces to be bonded and the package is preheated for 30-70 s under a pressure of 0.1-0.2 MPa, after which the heated package is moved for 5 s in a shaft with a heated tire rail, where it is held for 6 hours at a temperature of 125-135 ° C (description of the invention to the AS of the USSR No. 1659191).

As a result of the implementation of the known method, a multilayer bent-glued part with high-quality performance characteristics is obtained, however, as a result of the application of the method, it is not possible to produce a lining with molded plastic having high performance characteristics.

Closest to the technical nature of the claimed invention is a method of manufacturing curved facade surfaces of furniture, including the formation of a multilayer workpiece from the base, bending the workpiece at the same time as gluing and facing the part. Preparations from MDF are cleaned of dust, polished until the gloss is destroyed, stacked on top of each other and cut according to the cutting map. Then covered with glue and placed in a hydraulic press. The gluing process is carried out in a room with a temperature of 18 ° C with a relative humidity of 45-70%. In this case, the adhesive can be applied both to one and to both glued surfaces, for example, using a roller. The number of MDF sheets depends on their thickness, for example, with a thickness of 4 mm, 5 pieces are taken for the manufacture of bent doors, and with a thickness of 5 mm - 4 pieces. The time from the moment of applying glue to loading the mold into the press does not exceed 10 minutes The blanks are kept under pressure of 70-90 kgf / cm ² for 20-30 minutes. The lining is carried out in the process of gluing and bending or after it. In the first case, a film is used as the facing material, which is placed in the mold simultaneously with the workpiece. As a facing material, a decorative coating can be used, which is applied after removing the workpiece from the mold and processing (RF patent for the invention No. 2261640).

The known method is simple to implement, however, the technology does not provide for cladding of parts and blanks with molded plastic, which negatively affects the consumer properties of the products.

Thus, technical solutions are known from the prior art that provide for either manufacturing a bent part from a wood-containing material without postforming processing of the ends of the part, or solutions involving facing the ends of the part using postforming technology without bending the part as a whole.

The task to which the claimed technical solution is directed is to create an easy-to-implement method for manufacturing bent-glued parts of furniture facades and interiors with the possibility of lining the ends and edges of parts using postforming technology.

The technical result achieved when using the utility model is to enable the manufacture of an end surface of a curved profile lined with molded plastic.

The problem is solved in that in the method of manufacturing a lined bent facade part, which includes forming a multilayer workpiece, the outer layer of which is made of wood-containing material, after which the outer layer is lined, glued, and the layers of the workpiece are bent, according to the technical solution, when forming the workpiece, the outer layer is performed from a material provided with longitudinal grooves to enable bending, while one of the inner layers is made of at least two parts she, one of which - the smaller - is placed and glued along the end of the workpiece blank to the surface of the outer layer with subsequent milling to form a curved profile of the end surface of the part, and the other is large - placed and glued to the outer layer of the workpiece from the side of the longitudinal grooves while bending the whole parts after lining, while lining the outer layer and the end surface of the part is carried out by molded plastic. The part is faced with HPL plastic or acrylic plastic with a thickness of 0.4-1.5 mm.

The invention is illustrated by the following drawings.

Figure 1 presents the first stage of preparation of a multilayer workpiece parts.

Figure 2, 3 presents the stage characterizing the lining of the outer surface, edges and ends of the workpiece.

Figure 4, 5 presents the workpiece during bending with simultaneous bonding of the layers.

The positions in the drawings indicate:

1 - the outer layer of the workpiece,

2 - most of the inner layer of the workpiece,

3 - a smaller part of the inner layer of the workpiece,

4 - facing plastic,

5 - adhesive base

6 - end face details

α is the angle of curvature of the part.

The method is as follows.

To obtain a curved part from a wood-containing material, gluing technology is applied with the simultaneous bending of several layers of material. In this case, the adhesive composition is selected from the class of adhesives such as PVA or epoxy resin, that is, adhesives having the ability to form an inelastic film. Otherwise, when using glue that leaves an elastic film, there is a possibility of deformation of the bent part in the direction of return to the original undeformed state.

In this way, a multilayer workpiece blank is first formed. The workpiece may contain two, three or more layers of wood-containing material, equipped with cuts or grooves. As an embodiment, the part can be made of one (outer) layer 1 of milled wood-containing material and two layers of facing plastic 4, intended, on the one hand, for facing the surface, edges and ends of the part, and on the other hand, for holding in tension deformed bent state of the wood-containing material, or from one central layer of a milled wood-containing material, lined with plastic on one side and reinforced with a layer of plywood or veneer. However, the most optimal, from the point of view of time and energy consumption technology, is the embodiment of a part from two layers - external 1 and internal, milled wood-containing material, for example MDF, one of which - external 1 - is faced with molded plastic, for example acrylic or HPL. The material for the workpiece is cut according to the technological map. In this case, the blank of the outer layer 1 is a single sheet milled by MDF longitudinal grooves made from the side in contact with the inner layer, and the blank of the inner composite layer is a combination of several elements (parts) of different transverse sizes. The number of parts of the composite layer is selected depending on the operating conditions, the design solution of the part and the number of ends 6 of the part, faced by postforming. For example, for the manufacture of an arched part with two end surfaces of a curved profile, an inner layer consisting of three parts is used. For the manufacture of a curvilinear part having only one end of the curvilinear profile, it is enough to make a composite layer of two parts - less than 3, located along the end of the part (participating in the formation of the end of the curvilinear profile), and more than 2, made with the possibility of bending (with the radius of curvature of the outer layer )

Thus, to form a multilayer workpiece, an MDF sheet milled by longitudinal grooves as the outer layer 1 of the part is laid with the smooth side on the supporting surface. Then, smaller parts 3 of the composite layer in the form of bars of wood-containing material are glued along the ends 6 of the workpiece. The ends 6 of the workpiece are milled, giving the curved shape of the profile. The result is a staple-like structure, which is subjected to postforming (figure 1).

Postforming is a method of applying paper-layered plastic from the surface (particleboard, MDF) to the edge at an elevated temperature, at which the finishing material smoothly passes from the main plane to the ends. Equipment for facing by postforming is relatively simple and can be depending on the required performance of the positional and passage type. The postforming process is relatively simple and includes the following operations:

milling the necessary profile on one or two edges (ends) of the part;

lining the surface of the workpiece blank with the inlet of the finishing material over the edges of the part;

calibration of the overhang (inlet) value by milling;

removal, blowing off dust from the bonding zone with hot air;

combined application of glue on both surfaces to be glued - by spraying or rolling;

drying and activation of the adhesive layer with infrared lamps, in which the facing material becomes plastic, which acquires plasticity;

bending of the overhang around the profile edge;

rolling the profile edge by pressing the workpiece to the supporting surface to ensure bonding of the plastic layer to the sheet of wood-chip material, heating the material and controlling the achievement of the required temperature;

additional finishing processing of the profile edge (molding the end surface of the workpiece by milling).

As a result of these operations get a flat, lined with molded plastic from the side of the outer and end surfaces of the workpiece of the facade part (figure 2, 3).

Since the workpiece is formed from a piece of wood-shaving material milled by longitudinal grooves (cuts), it has increased elastic properties in the direction of cuts, which allows bending of the workpiece in the cut zone. However, it is necessary to provide for the possibility and fix the workpiece in a bent state. For this, the part is formed as a multilayer layer and, after the operation of lining the flat outer and curved end surfaces of the workpiece containing the outer wood-containing layer and a smaller part of the composite layer, the adhesive base is applied to the milled side of the outer layer. In addition, the adhesive base is applied to most of the composite layer 2, which is used as a sheet of wood-containing material, milled with longitudinal grooves. This part is placed under the outer layer so that the grooves made on the surfaces of the layers are oriented towards each other. Thus, all layers of the workpiece coated with an adhesive base 5 are combined for subsequent bonding and bending. The workpiece is laid on the mold and kept under pressure of 6 kgf / cm ² for 1-2 hours (Fig. 4, 5). In this case, the outer layer is bent by reducing the thickness of the cuts (compression), and part of the composite layer is bent by increasing the thickness of the cuts (tension).

Thus, as a result of bending the lined billet, a part is obtained, the upper and lower layers of which are glued together by surfaces milled by longitudinal grooves, thereby ensuring fixation of the part in a bent state during the entire period of operation.

Concrete example

The inventive method is implemented in the manufacture of door facades of a kitchen set of its own production. For the manufacture of a bent part of the door facade with the following dimensions: height - 716 mm, width - 408 mm, angle of curvature α = 12 °, MDF milled with longitudinal rectangular grooves 2 mm wide with a uniform pitch of 6 mm 8 mm thick and an adhesive composition of PVA grade were used. Two parts of a composite layer with a width of 22 mm and 18 mm are glued to the MDF sheet 408 mm wide along the ends. The ends with glued parts of the composite layer are milled, giving the necessary curvilinear shape, after which the workpiece is lined with 0.8 mm-thick HPL brand paper by postforming. After the post-forming process is completed, a staple-shaped workpiece blank is obtained with the external and end surfaces lined. Then a part of the composite layer with a width of 360 mm is glued while bending the entire workpiece.

Claims (2)

1. A method of manufacturing a lined bent facade part, comprising forming a multilayer workpiece, the outer layer of which is made of wood-containing material, after which the outer layer is lined, glued, and the layers of the workpiece are bent, characterized in that when forming the workpiece, the outer layer is made of material provided longitudinal grooves to allow bending, while one of the inner layers is made composite of at least two parts, one of which is smaller and they are glued along the end face of the workpiece to the surface of the outer layer with subsequent milling to form a curved profile of the end surface of the part, and another large one is placed and glued to the outer layer of the workpiece from the side of the longitudinal grooves while bending the entire part after lining, while facing the outer layer and end surface details are carried out by molded plastic. 2. A method of manufacturing a lined bent facade part according to claim 1, characterized in that the part is lined with HPL plastic or acrylic plastic with a thickness of 0.4-1.5 mm.

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