Search

CN-121973419-A - Production process of plastic strip

CN121973419ACN 121973419 ACN121973419 ACN 121973419ACN-121973419-A

Abstract

A production process of plastic strips comprises the following steps of S1, heating plastic to a hot melting state by a plastic extruder, continuously extruding the plastic to form hot melting plastic strips through an extrusion opening, S2, enabling the hot melting plastic strips to enter a bearing area of a stacking mechanism in an extrusion spraying mode from the extrusion opening, S3, driving the stacking mechanism to move to bear the hot melting plastic strips, enabling the bearing length L1 of the stacking mechanism to bear the hot melting plastic strips to be smaller than the extrusion length L2 of the plastic extruder to bear the hot melting plastic strips in unit time, enabling the hot melting plastic strips to form partial stacking and fold in the bearing area near the extrusion opening, and S4, cooling and shaping the plastic strips which are formed into the partial stacking and fold, and obtaining the plastic strips with uneven thickness and fold textures on the surfaces.

Inventors

  • ZHOU YUXUAN

Assignees

  • 周宇轩

Dates

Publication Date
20260505
Application Date
20260305

Claims (9)

  1. 1. The production process of the plastic strip is characterized by comprising the following steps of: s1, heating plastic to a hot melt state by adopting a plastic extruder (1), and continuously extruding the plastic through an extrusion port (2) to form a hot melt plastic strip (3); s2, extruding and spraying the hot melt plastic strips (3) from the extruding opening (2) into a bearing area of a stacking mechanism; S3, driving the stacking mechanism to move and receive the hot-melt plastic strips (3), so that the unit time receiving length L1 of the stacking mechanism to the hot-melt plastic strips (3) is smaller than the unit time extrusion length L2 of the plastic extruder (1) to the hot-melt plastic strips (3), and the hot-melt plastic strips (3) are partially stacked and wrinkled in a bearing area near the extrusion opening (2); S4, cooling and shaping the plastic strips which are partially stacked and are wrinkled to obtain the plastic strips (4) with uneven thickness and wrinkled textures on the surfaces.
  2. 2. A process for producing plastic strips according to claim 1, characterized in that the movement line speed V1 of the stacking mechanism is lower than the extrusion line speed V2 of the hot-melt plastic strips (3).
  3. 3. The process for producing plastic strips according to claim 2, wherein V1/V2 is 0.2 or less.
  4. 4. The process for producing plastic strips according to claim 1, wherein the stacking mechanism is any one of continuous constant speed, continuous variable speed, intermittent motion or reciprocating motion to adjust the density and randomness of wrinkles.
  5. 5. The process of claim 4, wherein the stacking mechanism is changed in speed according to a predetermined rule to make the crease density of the plastic strip in the length direction unevenly distributed.
  6. 6. The process for producing plastic strips according to claim 1, wherein the stacking mechanism is a conveyor belt (6), and the carrying surface of the conveyor belt is a plane, so that the bottom of the plastic strips after cooling and shaping is a plane.
  7. 7. A process for producing plastic strips according to claim 1, characterized in that the stacking mechanism is a turntable (7) which rotates around a central axis to receive the hot-melt plastic strips (3).
  8. 8. The process for producing plastic strips according to claim 7, wherein the circumference of the turntable is provided with arc protrusions (8) distributed along the circumferential direction, so that the cross section of the plastic strips after cooling and shaping is arc-shaped.
  9. 9. The process for producing plastic strips according to claim 1, wherein the cooling shaping comprises at least one of natural cooling, air cooling, water mist cooling or water cooling.

Description

Production process of plastic strip Technical Field The invention relates to the technical field of plastic product production, in particular to a production process of plastic strips. Background The plastic strip is used as a common strip plastic product and is widely applied to the fields of decoration, braiding molding, cladding reinforcement, furniture fittings, surface decoration of various molded parts and the like. The existing plastic strip is generally prepared by adopting an extrusion molding process, namely, plastic raw materials are heated and plasticized to a hot melt state in a plastic extruder, the hot melt plastic strip is formed by continuous extrusion through a mouth die/an extrusion mouth, and then a plastic strip finished product with a certain section size and length is obtained through steps of traction, cooling shaping and the like. The process has strong continuity, high efficiency and good size consistency, so the process is widely applied to industrial production. However, in order to ensure dimensional stability and consistency of appearance of the extruded strip, the extruded hot melt plastic strip is typically continuously drawn and straightened by a drawing mechanism at a speed substantially matching the extrusion speed, and cooled and set under relatively stable tension. The traditional process of extrusion, synchronous traction and cooling shaping can lead the hot melt plastic strip to be subjected to continuous stretching and surface tension trowelling in the cooling process, the surface of the material tends to be uniform, and the final finished product tends to have the appearance characteristics of smooth and flat surface, less texture change and insufficient stereoscopic impression. For application scenes needing to highlight decorative effects, pursue texture levels or hope to simulate natural textures, the appearance of the smooth strip is easy to be unified, and lacks of change and fashion sense, so that the requirements of the market on appearance novelty and decoration are difficult to meet. In order to improve the surface effect of plastic strips, there are also proposals in the prior art to improve the appearance by means of die modification, embossing knurling, laminating, spraying or adding pearl powder/flash powder into the material. For example, the appearance can be changed to a certain extent by changing the profile of the extrusion die to form ribs, waves or abnormal sections, but the textures are usually regularly repeated, random relief effect similar to natural materials is difficult to form, and higher development and switching cost is brought by changing the die, the surface textures or gloss can be increased by post-processing embossing, hot pressing or film coating spraying, new equipment and procedures are needed, the energy consumption and manufacturing cost are increased, the consistency of the embossing depth, the adhesion fastness, the weather resistance and the like are also easily influenced by process fluctuation, and the gloss or flash point can be improved only by adding pearlescent materials, but if the surface of the plastic strip body is still flat, the three-dimensional level is still insufficient, and the comprehensive appearance improvement is limited. Therefore, the existing plastic strip production technology has the following common defects: On one hand, the traditional synchronous traction shaping makes the finished product easily form a smooth strip structure, and has strong appearance repeatability and lacks of three-dimensional textures; On the other hand, the scheme relying on die change or post-treatment often has the problems of high cost, complex process and difficult compromise between stability and consistency, and the appearance effect of the plastic strip with uneven thickness and wrinkled textures on the surface is difficult to obtain while continuous and efficient production is kept. Based on this, further improvements are necessary. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide the plastic strip which has the advantages of simple structure, low manufacturing cost, rich surface textures, more layering appearance and novelty. The invention aims at realizing the production process of the plastic strip in the following mode, which comprises the following steps: s1, heating plastic to a hot melt state by adopting a plastic extruder, and continuously extruding the plastic through an extrusion port to form a hot melt plastic strip; S2, extruding and spraying the hot melt plastic strips from the extruding opening into a bearing area of a stacking mechanism; S3, driving the stacking mechanism to move to accept the hot-melt plastic strips, so that the unit time accepted length L1 of the stacking mechanism to the hot-melt plastic strips is smaller than the unit time extruded length L2 of the plastic extruder to the hot-melt plastic strips, and the hot-melt plastic strips are par