CN111946009A

CN111946009A - Back-groove floor and production method thereof

Info

Publication number: CN111946009A
Application number: CN202010816579.4A
Authority: CN
Inventors: 张小玲; 肖志远
Original assignee: Changzhou Bemate Home Technology Co Ltd
Current assignee: Changzhou Bemate Home Technology Co Ltd
Priority date: 2020-08-13
Filing date: 2020-08-13
Publication date: 2020-11-17

Abstract

A back groove floor and a production method thereof belong to the field of plates. The back-groove floor comprises a substrate layer, at least one group of grooves are formed in the back surface of the substrate layer, each group of grooves consists of a plurality of parallel grooves, the nearest distance between each groove and the peripheral edge of the substrate layer is not less than 15mm, and the depth of each groove is 20% -50% of the thickness of the substrate layer. The production method comprises the steps of continuously extruding a high-temperature base material layer, calendaring and forming, rolling and forming a groove on the back surface of the continuous base material layer in the calendaring process, cooling and cutting; or continuously extruding the high-temperature base material layer, calendaring, forming, cooling and cutting, and then grooving the back surface of the base material layer of the single floor to form the groove. The back groove floor and the production method thereof have the advantages that the specific grooves are formed in the back surface, so that the overall weight of the floor can be reduced, the raw material cost and the transportation cost are saved, and the sound insulation performance of the floor can be enhanced.

Description

Back-groove floor and production method thereof

Technical Field

The application relates to the field of plates, in particular to a back groove floor and a production method thereof.

Background

The PVC floor is a very popular floor decoration material at present, has the advantages of environmental protection, super wear resistance, various colors and varieties, quick installation and construction and the like, and is particularly widely used in places with large pedestrian volume, such as hospitals, schools, office buildings, markets, supermarkets and the like. An SPC floor (stone plastic floor) is one of PVC floors, and is usually formed by taking PVC as a raw material, adding auxiliary agents such as a plasticizer, a stabilizer, a coloring agent and the like, directly extruding a substrate layer, and carrying out online calendering and one-step forming on the substrate layer and functional layers such as a color film, an abrasion-resistant layer and the like. The SPC floor not only has various advantages of the conventional PVC floor, but also has simple production procedures and short production period, and is a floor product which is hot at present.

However, because the SPC floor has high density, single SPC floors with the same area have heavy weight, high transportation cost is needed, and workers are difficult to carry during installation; and the SPC floor has good compactness, is a good sound transmission medium, and particularly has poor sound insulation effect of the SPC floor without a mute film.

Disclosure of Invention

The embodiment of the application aims to provide a back groove floor and a production method thereof, wherein a specific groove is formed in the back surface of the back groove floor, so that the overall weight of the floor can be reduced, the raw material cost and the transportation cost can be saved, and the sound insulation performance of the floor can be enhanced.

The application is realized as follows:

in a first aspect, examples of the present application provide a back-grooved floor, which includes a substrate layer, where the back of the substrate layer has at least one group of grooves, each group of grooves is composed of a plurality of parallel grooves, the closest distance between the groove and the peripheral edge of the substrate layer is greater than or equal to 15mm, and the depth of the groove is 20% -50% of the thickness of the substrate layer.

In the technical scheme, the back surface of the back groove floor (namely the back surface of the substrate layer) is provided with specific grooves, specifically, groups of grooves are arranged, each group of grooves consists of a plurality of parallel grooves, and the nearest distance between the groove and the peripheral edge of the substrate layer is more than or equal to 15mm, so that the integral strength of the substrate layer and the back groove floor is ensured, and the phenomenon that the groove is too close to the peripheral edge of the back groove floor to cause stress damage during splicing and installation of the back groove floor is avoided; the depth of the groove is 20% -50% of the thickness of the base material layer, the weight of the base material layer and the whole back groove floor can be reduced as far as possible, the strength is guaranteed, and the situation that the groove is too deep and the front surface of the back groove floor is stressed and damaged is avoided. Therefore, the back-groove floor of the application example not only can reduce the whole weight of the floor, save the raw material cost and the transportation cost, but also can enhance the sound insulation performance of the floor. When the back groove floor is installed on the ground, the front surface faces upwards, the back surface faces downwards, and sound is transmitted to the groove from top to bottom (from the front surface to the back surface of the back groove floor), firstly, the sound is transmitted into gas (air in the groove) from a solid (namely, the back groove floor) and energy loss can be caused when the sound wave is transmitted due to uneven scattered distribution of the air, so that the sound transmission is greatly reduced.

In one possible embodiment of the present application, the cross-section of the groove is semicircular;

and/or the distance between adjacent grooves in the same group of grooves is 2-4 mm;

and/or each groove is arranged along the length direction of the substrate layer.

In the above technical solution, the cross section of the groove is semicircular, that is, the semicircular long groove is not only easy to form, but also the sound can be greatly lost when propagating therein. The distance between the adjacent slot is 2 ~ 4mm in the same group's slot, in the monolithic back of the body groove floor of the same area, can set up the slot that quantity is as much as possible to greatly alleviate the whole weight in floor, but also can guarantee the holistic intensity in floor. Each groove is arranged along the length direction of the base material layer, so that the grooves can be easily machined and formed, and particularly, when a continuous floor is produced, the grooves can be machined along the length direction of the floor only by continuously moving the floor and machining the grooves at fixed positions.

In one possible embodiment of the application, the back surface of the substrate layer is provided with at least two groups of grooves, each group of grooves is arranged along the length direction of the substrate layer, and the nearest distance between two adjacent groups of grooves is more than or equal to 30 mm.

In the technical scheme, a certain blank area (with the length of 30-40 mm) without grooves is reserved between the grooves which are arranged in groups, so that the overall strength of the floor can be enhanced, the cutting between different groups of grooves is facilitated to form a single floor, and meanwhile, the nearest distance between the grooves on the single floor and the peripheral edge is still ensured to be more than or equal to 15 mm.

In one possible embodiment of the application, the color film and the wear-resistant layer are sequentially laminated and attached to the front surface of the substrate layer;

optionally, the thickness of the substrate layer is 3.5-8.0 mm; the thickness of the color film is 0.05-0.10 mm; the thickness of the wear-resistant layer is 0.15-0.7 mm.

In the technical scheme, the base material layer, the color film and the wear-resistant layer which are sequentially stacked form the floor, and the front side of the floor has a decorative effect and a wear-resistant effect.

In a possible embodiment of the present application, the substrate layer further includes a mute film flatly attached to the back surface of the substrate layer, and the mute film covers the notch of the groove and is spaced from the bottom of the groove by a certain distance.

In the technical scheme, the mute film is smoothly attached to the back of the base material layer, a cavity is formed between the mute film and the groove, after sound is transmitted through the groove and passes through the mute pad, the sound is transmitted into the solid (the mute pad) through gas (air in the cavity), and energy is lost again, so that a good mute effect can be further achieved.

In a second aspect, the present application provides a method for producing a back-grooved floor provided in the first aspect, which includes the following steps:

continuously extruding a high-temperature base material layer, calendaring and forming, rolling and forming a groove on the back of the continuous base material layer in the calendaring process, cooling and cutting;

or continuously extruding the high-temperature base material layer, calendaring, forming, cooling and cutting, and then grooving the back surface of the base material layer of the single floor to form the groove.

In the technical scheme, in the production process of continuously processing the back-grooved floor, the first grooving method is that a specific groove is formed on the back surface of the base material layer in a rolling way during the rolling forming, the method has few processes, and no redundant reclaimed materials are generated; the second grooving method is to dig grooves in the back of the profiled floor, which can result in deep grooves. The back groove floor can be produced by the method.

In one possible embodiment of the present application, the temperature of the extruded substrate layer is 200 to 210 ℃; the extrusion speed is 1400-1450 mm/min.

In the technical scheme, the temperature of the extruded base material layer is 200-210 ℃, the base material layer is conveniently rolled and bonded with other functional layers, and the base material layer has strong plasticity and is convenient to roll to form a groove during rolling.

In one possible embodiment of the present application, the roll temperature used for calendering is 160 to 190 ℃.

In the technical scheme, the temperature of the roller adopted by calendering is 160-190 ℃, the base material layer with a certain temperature and other functional layers are further guaranteed to be calendered and bonded together, and the roller with a specific shape is adopted, so that the groove is easily formed by rolling.

In one possible embodiment of the application, the grooves are formed by rolling with a ground roller having raised embossings matching the grooves.

In the technical scheme, the shading roller is provided with the convex embossing matched with the groove, and the substrate layer is directly rolled, so that the groove with a certain depth can be formed on the substrate by rolling.

In one possible embodiment of the present application, the grooving tool is used for grooving the grooves.

In the technical scheme, the grooving cutter is adopted, and grooves with certain depth can be formed on the formed substrate layer by grooving.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 shows a schematic structural view of a back-grooved floor according to an embodiment of the present application;

fig. 2 shows a schematic structural diagram of another view of the back groove floor according to the embodiment of the present application.

Icon: 100-back-grooved floor; 110-a substrate layer; 120-a trench; 130-color film; 140-wear resistant layer.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of embodiments of the present application, generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

A back-grooved floor and a method for manufacturing the same in the present example will be described in detail below.

The inventors have found that the original PVC flooring, especially SPC flooring, has relatively less energy loss in sound transmission because of its stable, dense solid structure, and it is thought that the sound transmission is greatly reduced by changing a part of the solid structure into a groove structure. Particularly, grooves are formed in the back of the SPC floor on the basis of the existing SPC floor, so that the weight of the floor can be reduced, the raw material cost and the transportation cost can be saved, the sound transmission is mainly reduced, and the sound insulation performance of the floor is enhanced. The existing floor is not provided with a specific groove on the back surface, namely the groove structure which can obviously reduce the whole weight of the floor and can also enhance the sound insulation performance. The groove structure is obviously different from a shallow texture (such as a grid texture with the depth of about 0.03 mm) which is extruded on the back of the floor and mainly plays a role of decoration and skid resistance.

It should be noted that the "back" and the "front" in the examples of the present application are opposite sides of the board, the "front" refers to the side facing outward after the floor board is laid in place, and the "back" refers to the side facing inward. Also, the term "floor" in the examples of the present application refers generally to a sheet for decorating a floor surface and may also refer to a sheet for decorating a wall surface in some cases. In the case of the floor panel in the present example, when it is used for decorating a floor surface, the "back surface" is the surface adjacent to the floor surface when it is laid on the floor surface, and the "front surface" is the surface facing upward.

In addition, the "floor" in the present example is mainly a PVC floor, that is, the substrate layer is made of PVC as a main raw material, for example, SPC floor, but it is needless to say that the floor is not excluded from other material type floors, and generally, any floor made of dense material is included in the protection scope of the present example.

The back-grooved floor 100 in the present example will be described with reference to fig. 1 and 2.

As shown in fig. 1 and fig. 2, the present application example provides a back-grooved floor 100, which includes a substrate layer 110, and the front surface of the substrate layer 110 may be laminated with other functional layers to obtain corresponding functions; the back surface of the substrate layer 110 is provided with at least one group of grooves 120, each group of grooves 120 is composed of a plurality of parallel grooves 120, the nearest distance between each groove 120 and the peripheral edge of the substrate layer 110 is not less than 15mm, for a single floor with long length, the back surface of the substrate layer 110 is provided with at least two groups of grooves 120, each group of grooves 120 are arranged along the length direction of the substrate layer 110, the nearest distance between every two adjacent groups of grooves 120 is not less than 30mm, each groove 120 is in a long strip shape and is arranged along the length direction of the substrate layer 110; the depth of the groove 120 is 20% -50% of the thickness of the substrate layer 110; the distance between adjacent grooves 120 in the same group of grooves 120 is 2-4 mm. The cross-sectional shape of the groove 120 is not limited in the present application, and may be trapezoidal, semicircular or other shapes, and generally, the cross-section (the cross-section perpendicular to the plane of the floor) of the groove 120 is semicircular, and accordingly, the width of the groove opening of the groove 120 is the same as the depth thereof.

In the case that the back groove floor 100 is an SPC floor, the back groove floor 100 further includes a color film 130 and a wear-resistant layer 140 laminated on the front surface of the substrate layer 110 in sequence, that is, the back groove floor 100 includes the substrate layer 110, the color film 130, and the wear-resistant layer 140 laminated in sequence from bottom to top, and the back surface (lower surface) of the substrate layer 110 is provided with the groove 120. In general, the base material layer 110 is made of PVC as a raw material, and additives such as a plasticizer, a stabilizer, a colorant and the like are added, and the thickness of the base material layer 110 is 3.5 to 8.0 mm; the thickness of the color film 130 is 0.05-0.10 mm; the thickness of the wear-resistant layer 140 is 0.15-0.7 mm.

Compared with the conventional SPC floor without back grooves, the single-piece back groove floor 100 disclosed by the application example is light in weight by about 7% -14%, the floor quality is reduced, raw materials can be saved for manufacturers, the transportation cost is saved for customers, the sound insulation effect is increased, and the installation is more labor-saving for installers.

In order to further enhance the sound insulation effect of the floor, the back-grooved floor 100 further includes a silencing film flatly attached to the back surface of the substrate layer 110, and the silencing film covers the notch of the groove 120 and is spaced from the bottom of the groove 120 by a certain distance.

It should be noted that, because the conventional mute membrane is soft, for example, the common IXPE membrane is attached to the substrate layer 110 having the groove 120, the mute membrane is easy to collapse into the groove, i.e., the mute membrane is not flat, which may cause the residual depression of the floor and unqualified wheelchair test, and the preset sound insulation effect cannot be obtained. Therefore, the present example employs a low-elasticity mute film, such as a low-elasticity IXPE film, to ensure that the mute film is smoothly attached to the back surface of the substrate layer 110.

In comparison, the back-grooved floor 100 without the soundproof film of the present example has better soundproof effect than the conventional back-grooved SPC floor without the soundproof film; the mute film-attached back-grooved floor 100 of the present example provides better sound insulation than the conventional mute film-attached non-back-grooved SPC floor.

In addition, for the PVC flooring, the substrate layer 110 with a high temperature is generally prepared by a continuous extrusion process, and is rolled together with other functional layers by using the temperature of the substrate layer 110 (mainly, the substrate layer 110 and other functional layers are melted and bonded together under a certain temperature and pressure by using the material characteristics of the substrate layer 110 and other functional layers).

On the basis, the inventor explores the production process of the back-groove floor 100, which is specifically divided into two processes: the first is an extrusion process: after the substrate layer 110 is extruded, when the substrate layer is rolled together with functional layers such as the color film 130 and the wear-resistant layer 140, a special backing roll is arranged on the back surface of the substrate layer 110, so that the back surface of the rolled substrate layer 110 is provided with the groove 120, then the substrate layer is cut, and grooves are formed around the single floor to form tongue-and-groove joints and grooves for splicing, so that the single back-grooved floor 100 can be obtained. The second method is a grooving method: after the production of the single-piece conventional floor is finished, a special cutter is adopted to dig grooves on the back surface of the single-piece conventional floor, and the single-piece back-groove floor 100 is obtained. Compared with the first extrusion method, the first extrusion method has fewer processes, and no redundant recycled material is generated, but the depth of the groove 120 obtained by the method is shallow, and the groove 120 on the back groove floor 100 of the single piece can be ensured at a preset specific position only by accurately controlling when the tongue and the groove are manufactured by cutting and grooving around; the second trenching algorithm is relatively simple to operate, with the depth of the trench 120 being large, but with one more pass and more recycled material being produced.

The method for producing the back-grooved floor 100 in the present example will be described below.

The application example provides an extrusion production process of the back groove floor 100, which comprises the following steps: and continuously extruding the high-temperature base material layer 110, wherein the temperature of the extruded base material layer 110 is generally 200-210 ℃, the extrusion speed is generally 1400-1450 mm/min, and calendering and molding are carried out, in the calendering process, the groove 120 is formed by rolling on the back surface of the continuous base material layer 110, the temperature of a roller used for calendering is 160-190 ℃, a shading roller is used for forming the groove 120 by rolling, the shading roller is provided with convex embossing matched with the groove 120, and cooling and cutting are carried out to obtain the single back groove floor 100.

When the floor is an SPC floor, the production method of the back-grooved floor 100 is specifically as follows:

s1, uniformly mixing 75 parts by weight of PVC powder, 225 parts by weight of stone powder, 7 parts by weight of a stabilizer (calcium zinc stabilizer) and some auxiliaries at a high speed to form a PVC extrusion material, wherein the PVC extrusion material is prepared according to the formula of the extrusion material of a conventional SPC floor; and (3) continuously extruding the PVC extrusion material by using an extruder to obtain a continuous high-temperature substrate layer 110, wherein the temperature of the extruder is generally 160-210 ℃, and the thickness of the extruded substrate layer 110 is 3.5-8.0 mm.

S2, laminating the extruded substrate layer 110, a continuous 0.05-0.10 mm color film 130 and a 0.15-0.7 mm wear-resistant layer 140, and performing calendering molding at 160-190 ℃ and a certain pressure through a roller, wherein during calendering, a shading roller in the roller rolls on the back surface of the substrate layer 110 to form the groove 120. The calendering is mainly to bond the layers together, and after the calendering, the thicknesses of the layers are not significantly changed, that is, the thicknesses of the substrate layer 110, the color film 130 and the wear-resistant layer 140 are considered to be hardly changed compared with the thicknesses before the calendering.

For the finished floor with the length, width and thickness of A, B, C, calendering by adopting a base pattern roller with the perimeter of A plus (9-20) mm, the height of the embossing is 1/5C-1/2 Cmm, when each floor is provided with 3 groups of grooves 120 arranged along the length direction, the length of each embossing is (A-180)/3mm, the total width of each group of grooves 120 is B- (30-40) mm, the width of each small embossing is 2-4 mm, the distance between two adjacent grooves 120 of the same group of grooves 120 is 2-4 mm, the nearest distance between two adjacent groups of embossing is 30-50 mm, and the grooves 120 in specific arrangement and combination can be obtained according to the specific embossing mode.

And S3, cutting the continuous floor boards formed by rolling along the length direction without the grooves 120 to ensure that each floor board has at least one group of grooves 120, for example, each floor board has 3 grooves 120.

S4, after the floor is stood, the floor is coated by spraying, and the periphery of the floor is grooved to form tongues and grooves, wherein the grooves need to be sized, so that the distance between each groove 120 and the peripheral edge of the floor is more than or equal to 15 mm.

The production process of the extrusion method pays attention to the following points:

1. the embossing height, arrangement mode, diameter and other designs of the bottom embossing roller are as follows: because each type of floor has fixed length and width and thickness, different ground pattern rollers are designed to form corresponding grooves 120 according to the floors with different length and width sizes, after the grooves are formed on the periphery of the floor to form tongues and grooves, the distance between each groove 120 and the peripheral edge of the floor is more than or equal to 15mm, and the distance between each group of grooves 120 and each groove 120 is about 30 mm; then, the corresponding embossing height and the depth of the corresponding groove 120 are designed according to different thicknesses.

2. Cutting the floor after rolling: each shading roller corresponds to a size of the floor, so when cutting, the cutting is required to be carried out at a corresponding position.

3. Grooving positions: because the position of the groove 120 on the floor is fixed firstly, the cutting size, the position and the like need to be paid attention when the groove is formed on the periphery of the floor, the groove 120 of the grooved floor is ensured to be in the middle of the floor, and the distance between the groove 120 and the periphery of the floor is more than or equal to 15 mm.

The present application example further provides a grooving method production process for the back groove floor 100, which includes the following steps: continuously extruding a high-temperature base material layer 110, wherein the temperature of the extruded base material layer 110 is generally 200-210 ℃; the extrusion speed is generally 1400-1450 mm/min, the single floor is subjected to calendaring molding, the temperature of a roller used for calendaring is 160-190 ℃, after cooling and cutting, a grooving tool is used for grooving the back surface of the substrate layer 110 of the single floor to form a groove 120, and the single floor with back grooves 100 is formed.

s1, uniformly mixing 75 parts by weight of PVC powder, 225 parts by weight of stone powder, 7 parts by weight of a stabilizer (calcium zinc stabilizer) and some auxiliaries at a high speed to form a PVC extrusion material; and (3) continuously extruding the PVC extrusion material by using an extruder to obtain a continuous high-temperature substrate layer 110, wherein the temperature of the extruder is generally 160-210 ℃, and the thickness of the extruded substrate layer 110 is 3.5-8.0 mm.

The extruded base material layer 110, a continuous 0.05-0.10 mm color film 130 and a 0.15-0.7 mm wear-resistant layer 140 are laminated together, and are subjected to calendering molding at 160-190 ℃ and under a certain pressure through rollers, wherein the rollers subjected to calendering are all conventional mirror rollers.

And S3, cutting the continuous floor board formed by rolling along the length direction.

S4, after the floor is stood, the floor is coated by spraying, and the periphery of the floor is grooved to form tongues and grooves.

S5, after grooving, grooving by adopting a grooving cutter according to the length, width, thickness, A B and C of the floor and setting a corresponding jump cutter program, grooving the back of the substrate layer 110, and ensuring that the single floor is provided with at least one group of grooves 120, for example, 3 groups of grooves 120 arranged along the length direction, the depth of the groove 120 is less than or equal to 1/2Cm, and the distance between the groove 120 and the peripheral edge of the floor is more than or equal to 15 mm.

The production process of the grooving method needs to be noticed that: according to the floors with different lengths, widths and thicknesses, corresponding jump cutter programs are designed, the jump cutter time and the distance and the depth are controlled, the distance between the groove 120 and the peripheral edge of the floor is guaranteed to be larger than or equal to 15mm, and the nearest distance between two adjacent groups of grooves 120 is larger than or equal to 30 mm.

The features and properties of the present application are described in further detail below with reference to examples.

Example 1

This embodiment provides a method for manufacturing a back-grooved floor 100, the floor model 1220 × 180 × 4.2mm, the specific process is as follows:

the raw materials of the substrate layer 110 are 75 parts of PVC, 225 parts of stone powder, 5 parts of ACR, 7 parts of a stabilizer, 1.2 parts of external lubricant and 1 part of internal lubricant, and the continuous substrate layer 110 is extruded by an extruder, wherein the temperature of a machine barrel of the extruder is 200-210 ℃, the temperature of a confluence core is 160-180 ℃, the temperature of a die is 200-210 ℃, the rotating speed of the extruder is 18-20 r/min, the feeding rotating speed is 7-16 r/min, and the extruding speed is 1400-1450 mm/min.

The extruded base material layer 110, the 0.3mm wear-resistant layer 140 and the color film 130 are subjected to calendaring molding through a roller, the temperature of the roller is 175-180 ℃, grooves 120 are formed in the back surface of the base material layer 110 through a shading roller in the roller in a rolling mode, the depth of each groove 120 is 1.4mm, the distance between every two adjacent groups of grooves 120 is 30mm, and the total number of the grooves 120 of the single-piece floor is 25 and is divided into 5 groups.

And cutting, namely grooving the periphery, wherein the distance between the groove 120 on each floor and the long edge of the floor is more than 15mm, the distance between the groove 120 on each floor and the short edge of the floor is more than 30mm, and attaching a mute film to the back surface of the substrate layer 110 to obtain the back-grooved floor 100.

The finished product of the single-piece floor has the warpage of 0.6mm, the size shrinkage is 0.01 percent transversely, 0.02 percent longitudinally and the participation recess is 7.6 percent. Each performance index of the floor is qualified, and the weight of each floor is 186g lighter than that of the conventional floor without back grooves, which is about 10 percent.

Example 2

This example provides a method of manufacturing a back-grooved floor 100, model 1220 x 180 x 5.0mm, which is substantially the same as the method of manufacturing example 1, except that:

the wear resistant layer 140 has a thickness of 0.5mm and the grooves 120 have a depth of 1.9 mm.

The finished product of the single floor board has the warp of 0.5mm, the size shrinkage is 0.01 percent at the transverse direction, 0.02 percent at the longitudinal direction, the participating depression is 6.73 percent, all performance indexes are qualified, and the weight of each floor board is 227g lighter than that of the conventional non-back-grooved floor board 100 and is about 10 percent.

Example 3

The present embodiment provides a method for manufacturing a back-grooved floor 100, the floor model 1500 × 228 × 5.0mm, which comprises the following steps:

And (3) calendering and molding the extruded base material layer 110, the 0.7mm wear-resistant layer 140 and the color film 130 by using a roller, wherein the temperature of the roller is 175-180 ℃, and the roller is a conventional mirror roller.

Cutting, after grooving the periphery, grooving the back by adopting a grooving cutter to form a groove 120, wherein the depth of the groove 120 is 2.2mm, the total number of the grooves 120 of the single-piece floor is 32, the grooves are divided into 4 groups, the distance between every two adjacent groups is 30mm, the distance between the groove 120 and the long edge is more than 15mm, the distance between the groove 120 and the short edge is more than 30mm, and a mute film is attached to the back of the substrate layer 110 to obtain the back-grooved floor 100.

The finished product of the single floor board has the warpage of 0.6mm, the size shrinkage is 0.02 percent transversely, the longitudinal direction is 0.02 percent longitudinally, the participating depression is 7.2 percent, all performance indexes are qualified, and the weight of each floor board is 408g lighter than that of the conventional floor board and is about 12 percent.

In summary, the back groove floor and the production method thereof provided by the embodiment of the application have the advantages that the specific grooves are formed in the back surface, so that the overall weight of the floor can be reduced, the raw material cost and the transportation cost are saved, and the sound insulation performance of the floor can be enhanced.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. The back-grooved floor is characterized by comprising a substrate layer, wherein the back surface of the substrate layer is provided with at least one group of grooves, each group of grooves consists of a plurality of parallel grooves, the nearest distance between each groove and the peripheral edge of the substrate layer is not less than 15mm, and the depth of each groove is 20-50% of the thickness of the substrate layer.

2. The back-grooved floor as claimed in claim 1, wherein the grooves are semicircular in cross section;

3. The back-grooved floor as claimed in claim 1, wherein the back surface of the substrate layer has at least two sets of grooves, each set of grooves is arranged along the length direction of the substrate layer, and the nearest distance between two adjacent sets of grooves is greater than or equal to 30 mm.

4. The back-grooved floor according to claim 1, further comprising a color film and a wear-resistant layer laminated in sequence on the front surface of the substrate layer;

5. The back-grooved floor as claimed in claim 1, further comprising a silencing film flatly attached to the back surface of the substrate layer, wherein the silencing film covers the groove opening of the groove and is spaced from the bottom of the groove.

6. A method of producing a back-grooved floor according to claim 1 wherein: which comprises the following steps:

7. The production method of the back groove floor as claimed in claim 6, wherein the temperature of the extruded base material layer is 200-210 ℃; the extrusion speed is 1400-1450 mm/min.

8. The method for producing a back-grooved floor according to claim 6, wherein the temperature of the roller used for calendering is 160 to 190 ℃.

9. The method for producing a back-grooved floor according to claim 6 wherein the grooves are formed by rolling a master roll having raised embossings matching the grooves.

10. The method of claim 6, wherein the grooving tool is used to form the grooves.