Double-layer composite floor extrusion die

Abstract

The utility model discloses a double-layer composite floor extrusion die which comprises an upper die, a middle die and a lower die which are sequentially buckled from top to bottom, and is characterized in that an upper rear die lip is arranged at the front end of the upper die, a lower rear die lip is arranged at the front end of the lower die, and a first clothes hanger type runner is defined by the upper die, the upper rear die lip and the middle die; a second clothes hanger type runner is defined by the middle die, the lower rear die lip and the lower die, the first clothes hanger type runner and the second clothes hanger type runner are respectively provided with an independent feeding port, and the straight section of the first clothes hanger type runner and the straight section of the second clothes hanger type runner are communicated with each other.

Description

Technical Field

[0001] The utility model relates to a double-layer composite floor extrusion die, belonging to the technical field of die design. Background Art

[0002] LVT is a new type of decorative flooring on the market in recent years. Its main raw materials are polyvinyl chloride (PVC) and calcium powder. This type of flooring is thin, wear-resistant, elastic, fire-retardant, moisture-proof, sound-absorbing and noise-proof.

[0003] The production process of LVT floor can be summarized into three categories:

[0004] The internal mixer process uses an internal mixer to heat and stir the mixed plastic materials into a semi-plasticized state, then passes through a crusher to an internal mixer to form plasticized sheets, which are then conveyed to a sheeting machine for sheeting. The colored wear-resistant layer + colored film layer + the sheeted middle material + the sheeted base material (which has a higher oil content and a lower proportion of calcium powder than the middle material and base material) are then hot-pressed into shape by a press.

[0005] Extruder + mold + calendering laminating line process, the extruder mixes the mixed plastic materials in the high and low mixer at high and low speeds, mixes them evenly and keeps them in powder form, and then enters the extruder for heating, shearing, compression, plasticization, exhaust, and extrusion through the mold into a single-layer sheet (we call it the base material), which is then heat-insulated and thickened by related equipment (such as a calender) in a hot state. At the same time, the dough (the dough consists of a wear-resistant layer + color film, etc.) is laminated on the upper part of the line to form a single-base LVT product. In order to achieve the effect of less warping, sometimes a layer of black film will be pasted on the back of the base material online after the base material is formed.

[0006] Double extruder + double mold + calendering substrate bonding + calendering line bonding process, use 2 sets of extruders + 2 sets of molds as above, stack and press 2 pieces of substrate (the bottom one has more oil and less calcium powder) with fixed thickness through the calender, and then bond the surface skin (the surface skin consists of wear-resistant layer + color film, etc.) in the same way as process 2 to form a double-layer LVT floor with the same structure as process 1.

[0007] The semi-finished floor formed by these three processes is treated with wear-resistant protection on the surface through the UV paint coating production line, tempered through the heat treatment production line, punched into the required specifications by the punch press, chamfered on all sides, and finally packaged as a finished product.

[0008] LVT flooring is a soft and flexible elastic flooring, that is, "high-end vinyl flooring", a new type of material. Professionally described as "semi-rigid sheet plastic flooring", they can even be bent into rolls. The internal structure of LVT flooring generally includes UV paint layer, wear-resistant layer, color film layer, and LVT mid-base material layer. Generally, the mid-base material is two layers of LVT composited together.

[0009] In order to improve the dimensional stability of the floor, customers will ask the factory to add fiberglass mesh to the mid-base material layer to reduce deformation of the floor caused by temperature changes.

[0010] The bottom layer material is often more resilient and not easy to break. It is made of polyvinyl chloride, calcium powder, plasticizer and other materials. The middle layer material is easier to break. Therefore, the bottom material and the middle layer material together can play a stretching role, making the board less likely to warp.

[0011] The added PVC polyvinyl chloride is a non-toxic, odorless white powder. It has high chemical stability and good plasticity.

[0012] PVC is the most widely used and important polymer in the world, but pure PVC is actually the most unstable polymer, so the advantages of PVC can only be realized after adding appropriate stabilizers and other additives.

[0013] At present, most LVT floor production processes on the market are mainly divided into process 1 and process 2. Process 3 is a new process recently developed to replace process 1. Each process has its own advantages and disadvantages:

[0014] The disadvantages of the first process are that the equipment is large, occupies a lot of space, has high energy consumption, causes great pollution, and has complicated procedures.

[0015] The disadvantage of the second process is that it can only extrude a single layer of LVT-based material. Although a back sticker will be attached later, it cannot completely solve the problem of product warping.

[0016] The disadvantages of the third process are large equipment, large investment, large land area, high energy consumption and complicated procedures.

[0017] None of these three can meet the development needs of energy conservation, environmental protection and sustainable development in today's society.

[0018] Existing molds generally only extrude a single layer and then compound it. There are also two materials that are co-extruded together by two extruders through a distributor and then extruded through a mold to form a multi-layer structure. This production process has limitations, and the products produced have obvious differences in quality and appearance. At present, the molds that can form a relatively uniform co-extrusion layer by co-extruding the upper and lower covering are relatively mature, but the three-layer substrate structure cannot balance the tension of the lower layer and the wear-resistant layer on site because it is offset by the co-extruded layer on the upper layer of the substrate! It is difficult for the mold that co-extrudes the upper and lower layers to distribute the materials evenly when passing through the distributor, resulting in uneven thickness of the upper and lower layers at different positions in the width direction, which cannot meet the requirements of floor products.

[0019] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0020] The utility model aims to provide a double-layer one-time extrusion composite extrusion die.

[0021] In order to achieve the above purpose, the technical solution of the utility model is as follows: a double-layer composite floor extrusion die, including an upper die, a middle die and a lower die that are buckled in sequence from top to bottom, characterized in that: an upper rear die lip is provided at the front end of the upper die, a lower rear die lip is provided at the front end of the lower die, a first coat hanger-type flow channel is formed between the upper die, the upper rear die lip and the middle die, a second coat hanger-type flow channel is formed between the middle die, the lower rear die lip and the lower die, the first coat hanger-type flow channel and the second coat hanger-type flow channel are respectively provided with independent feed ports, and the straight sections of the first coat hanger-type flow channel and the second coat hanger-type flow channel are interconnected. A molding outlet is provided between the upper rear die lip and the lower rear die lip. After passing through the baffle rod, the raw material is rolled into one at the outlet through the upper rear die lip and the lower rear die lip.

[0022] The two different components of the base board raw materials are fully plasticized by two extruders and then sent to the upper and lower flow channels of a mold respectively. The two sheets are distributed up and down, and are compounded together in the forming section (professionally called the straight section) at the rear die lip outlet to form a double-layer structure. After the product is formed in one piece, it is sent to the roller for calendering, and then the temperature and thickness of the floor are controlled and adjusted according to the corresponding parameter requirements. Finally, the film is laminated to directly form the LVT double-base material structure floor.

[0023] Furthermore, it also includes a baffle rod. A groove for accommodating the baffle rod is provided at the connection between the upper mold and the upper rear mold lip, and a groove for accommodating the baffle rod is provided at the connection between the lower mold and the lower rear mold lip. The baffle rod is used to adjust the uniformity of the material flow.

[0024] Furthermore, it also includes a first adjusting screw, a second adjusting screw and a fixing screw, the first adjusting screw and the second adjusting screw are arranged in a row and vertically penetrate the upper die and the lower die, the lower end of the first adjusting screw abuts against the upper surface of the upper rear die lip and the upper surface of the lower rear die lip, respectively, for adjusting the thickness of the upper base plate raw material and the thickness of the lower base plate raw material. The lower end of the second adjusting screw abuts against the upper surface of the baffle rod, for adjusting the uniformity of the upper material flow and the uniformity of the lower material flow. The fixing screws are divided into two rows and symmetrically penetrate the upper die, for locking the upper die and the lower die.

[0025] Furthermore, the feed inlet of the first clothes-hanger type flow channel and the feed inlet of the second clothes-hanger type flow channel are respectively connected to two feed pipelines through a connector.

[0026] The present invention optimizes the production process, shortens the production cycle, reduces energy consumption, reduces production and processing steps, reduces labor intensity, is more energy-saving and environmentally friendly, has a high degree of automation in the production line, good production continuity, simple operation, and high production capacity, thereby making the double-base LVT floor produced by the company's LVT double-layer laminating one-time molding extrusion production line more competitive. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings, wherein:

[0028] Figure 1 It is a schematic diagram of the assembly of the present invention.

[0029] Figure 2 It is a schematic diagram of the assembly of the present invention.

[0030] Figure 3 It is a cross-sectional schematic diagram of the present disclosure.

[0031] In the figure: 1. upper die; 2. lower die; 3. middle die; 4. upper rear die lip; 5. lower rear die lip; 6. baffle rod; 7. first adjusting screw; 8. second adjusting screw; 9. fixing screw. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings:

[0033] This embodiment proposes a rear lip composite mold of an LVT floor (this mold can also be used to produce floors made of other materials). The mold is completely designed so that two different components of base board raw materials are fully plasticized by two extruders and then respectively sent to the upper and lower flow channels of a mold, such as Figure 1As shown, the mold body is composed of an upper mold 1, a lower mold 2, a middle mold 3, an upper rear mold lip 4, a lower rear mold lip 5, and two flow blocking rods 6. The molding structure of the upper substrate plate is that the raw material passes through the connector feed port A and enters the hanger-shaped flow channel composed of the upper mold 1 and the middle mold 3. The molding structure of the lower substrate plate is that the raw material passes through the connector feed port B and enters the hanger-shaped flow channel composed of the lower mold 2 and the middle mold 3. The first adjusting screw 7 and the second adjusting screw 8 are arranged in a row and vertically penetrate the upper mold 1. The lower end of the first adjusting screw 7 abuts the upper surface of the upper rear mold lip 4, and the lower end of the second adjusting screw 8 abuts the upper surface of the flow blocking rod 6. The fixing screw 9 is divided into two rows and symmetrically penetrates the upper mold 1. The uniformity of the material flow can be adjusted by the flow blocking rod 6 and the second adjusting screw 8. The upper rear mold lip 4 and the first adjusting screw 7 are adjusted to control the thickness of the raw material of the upper substrate plate, and the lower rear mold lip 5 and the first adjusting screw 7 are adjusted to control the thickness of the raw material of the lower substrate plate. This flow channel is a normal hanger. The shape and principle of the runner are exactly the same as those of the conventional hanger-type runner. After the raw material enters the AB and CD ports of the mold, it enters the hanger-type runner of the mold for compression, rectification and adjustment of the material flow into sheets. The two sheets are distributed up and down, and are compounded together in the forming section (professionally called the straight section) at the outlet of the rear die lip to form a double-layer structure. After the product is formed in one piece, it is sent to the drum for calendering. After calendering, the floor temperature and thickness and other values ​​are controlled and adjusted according to the corresponding parameter requirements. Finally, the film is laminated to directly form the LVT double-base material structure floor.

[0034] This mold can be regarded as two molds combined into one; this mold has two flow channel openings for feeding respectively; this mold can adjust the uniformity of raw materials through the upper and lower baffle bars; the mold outlet can adjust the raw material thickness through the upper rear die lip and the lower rear die lip.

[0035] The above description is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any person familiar with the technology can understand and think of any changes or substitutions within the technical scope disclosed by the present invention, which should be included in the scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A double-layer composite floor extrusion die, comprising an upper die, a middle die and a lower die which are sequentially buckled in an upper and lower order, characterized in that: An upper rear die lip is provided at the front end of the upper die, and a lower rear die lip is provided at the front end of the lower die. A first coat-hanger-type flow channel is formed between the upper die, the upper rear die lip and the middle die, and a second coat-hanger-type flow channel is formed between the middle die, the lower rear die lip and the lower die. Independent feed ports are provided for the first coat-hanger-type flow channel and the second coat-hanger-type flow channel respectively. The straight sections of the first coat-hanger-type flow channel and the second coat-hanger-type flow channel are interconnected, and a molding outlet is provided between the upper rear die lip and the lower rear die lip. A baffle rod is also included, and a groove for accommodating the baffle rod is provided at the connection between the upper die and the upper rear die lip, and a groove for accommodating the baffle rod is provided at the connection between the lower die and the lower rear die lip.

2. The double-layer composite floor extrusion die according to claim 1, characterized in that: It also includes a first adjusting screw, a second adjusting screw and a fixing screw. The first adjusting screw and the second adjusting screw are respectively arranged in a row and vertically penetrate the upper mold. The lower end of the first adjusting screw abuts against the upper surface of the upper rear mold lip, and the lower end of the second adjusting screw abuts against the upper surface of the baffle rod. The fixing screws are divided into two rows and symmetrically penetrate the upper mold.

3. The double-layer composite floor extrusion die according to claim 1, characterized in that: The feed inlet of the first clothes-hanger type flow channel and the feed inlet of the second clothes-hanger type flow channel are respectively connected to two feed pipelines through a connector.

Images