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Method and process for processing surface texture of PET injection stretch blow bottle


Background technology:


At present, in ASB injection stretch blow molding, the surface of PET injection stretch blow molding is mostly smooth. The PET crystals are damaged during the stretching process, and it is difficult to meet the skin texture effect of the design on the surface of the final product.


After searching, the Chinese Patent Publication No. CN107031020A discloses a blow molding method for frosted lampshades, including the following specific steps: S1. PET raw material and frosted particles are dried at a constant temperature, and melted and mixed through a feeding system; S2. frosted particles are provided with two layers , Forming a composite structure with PET raw materials, extruded by an extruder; S3. According to the characteristics of the material, it is preheated for 18-24s to reach the required processing temperature, and filtered by a filter metering pump to obtain the required processing material; S4. The heated materials are mixed through the distributor and then blow-molded by the mold. After the blow-molding, the material is rapidly cooled within 3-5 seconds to obtain the finished lampshade. By controlling the two key factors of fast heating and fast cooling after forming, the invention finds the optimum heating time and the best rapid cooling time after forming, and the PET lampshade has the best effect. The sheet can be completely softened, the size of the PET crystal grains is small, and the transparency of the produced PET lampshade meets the requirements of the lampshade. The invention solves the requirements of light transmittance and frosting of the lampshade, but the invention has a complicated process and cumbersome operation for ordinary PET bottles to achieve the effect of skin texture.




Technical realization elements:


The purpose of the present invention is to provide a method for processing surface texture of PET injection stretch blow bottle in order to overcome the above-mentioned defects in the prior art.


The purpose of the present invention can be achieved through the following technical solutions:


A method for processing surface texture of PET injection stretch blow bottle is used to form a texture effect on the surface of the PET injection stretch blow bottle.


Preferably, the injection stretch-blow process of the PET bottle is completed on the ASB injection stretch-blow machine.


Preferably, the dermatoglyph processing requirement is VDI-12.


Preferably, the process setting of the ASB injection stretch-blow machine includes air pressure setting and temperature setting.


Preferably, the air pressure is set to:


Preform compressed air inflation pressure: 2.5~3.0MPa, conventional pressure: 1.0~1.5Mpa.


Preferably, the temperature setting: cooling water temperature of the mold: 13°C-16°C; PET orientation stretching temperature: 90-110°C; PET drying and dehumidification temperature 140-150°C.


Compared with the prior art, the present invention has the following advantages:


1. The molding process is simple;


2. Good skin texture effect.


Specific implementation


The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.


The materials required for the surface texture process of PET injection stretch blow molding include: ASB injection stretch blow molding machine, masterbatch, PET raw material (CB602).


The said PET injection stretch blow product skin texture forming process principle:


The ASB injection stretch-blow machine integrates the molding, cooling, heating, stretching and inflation of the preform, as well as the removal of the product, which are completed in sequence on the same machine, because PET is a kind of crystallinity and orientation. High polymer, the surface of the final product is difficult to show the effect of skin texture.


The requirements for the formation of the skin texture of the PET injection stretch blow product:


(1) Mold skin texture processing requirements: VDI-12


(2) PET color masterbatch formulation requirements: the color masterbatch added in the process of injection stretch blowing of the PET bottle can affect the crystallization of PET, resulting in a grainy feeling and a frosted feeling.


(3) Process setting of ASB injection stretch blow machine:


A. Preform compressed air inflation pressure: 2.5~3.0MPa, conventional pressure: 1.0~1.5MPa


B. Temperature: ①The cooling water temperature of the mold: 13℃~16℃


②PET orientation stretching temperature: 90~110℃


③PET drying and dehumidifying temperature 140~150℃


The above are only specific embodiments of the present invention, but the scope of protection of the present invention is not limited to this. Any person skilled in the art can easily think of various equivalents within the technical scope disclosed in the present invention. Modifications or replacements, these modifications or replacements should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.