Tej teeb meem thiab kev daws teeb meem ntawm tsiaj lub raj mis yas
Mar 31, 2022
Cov txheej txheem tshuab moulding yog ob -txoj kev ncab. Thaum lub sij hawm tus txheej txheem no, ppt yas raj mis saw txuas ntxiv, taw qhia thiab ua raws li ob qho kev qhia, yog li ua kom lub zog ntawm lub raj mis phab ntsa, txhim kho tensile, tensile, cuam tshuam lub zog, thiab muaj cua zoo nruj. Txawm hais tias stretching pab txhim kho lub zog, nws yuav tsum tsis txhob ncab ntau heev. Txoj kev ncab-blow ratio yuav tsum tau tswj kom zoo: lub radial kev taw qhia yuav tsum tsis txhob ntau tshaj 3.5 mus rau 4.2, thiab axial kev taw qhia yuav tsum tsis txhob ntau tshaj 2.8 mus rau 3.1. Phab ntsa thickness ntawm preform yuav tsum tsis txhob ntau tshaj 4.5mm.
Tshuab lub raj mis yog ua los ntawm cov iav hloov pauv kub thiab crystallization kub, feem ntau tswj ntawm 90 thiab 120 degrees. Hauv qhov no, lub raj mis yas PET nthuav tawm lub xeev siab elastic, thiab nws dhau los ua lub raj mis pob tshab tom qab tshuab molding sai, txias thiab teeb tsa. Hauv ib qho - cov txheej txheem, qhov ntsuas kub no yog txiav txim siab los ntawm lub sijhawm txias hauv cov txheej txheem txhaj tshuaj molding (xws li Aoki tshuab moulding tshuab), yog li kev sib raug zoo ntawm kev txhaj tshuaj thiab tshuab tshuab yuav tsum muaj kev sib txuas zoo.
In the blow molding process, there are: stretching—one blow—second blow. The three actions take a very short time, but they must be well coordinated, especially the first two steps determine the overall distribution of the material and the quality of the blowing. Therefore, it is necessary to adjust: the starting timing of stretching, the stretching speed, the starting and ending timing of pre-blowing, the pre-blowing pressure, the pre-blowing flow rate, etc. If possible, it is best to control the overall temperature distribution of the preform, the bottle The temperature gradient of the inner and outer walls of the billet.
Nyob rau hauv tus txheej txheem ntawm ceev tshuab molding thiab txias, induced kev nyuaj siab yog generated nyob rau hauv lub raj mis phab ntsa. Rau cov fwj dej carbonated, nws tuaj yeem tiv taus lub siab sab hauv, uas yog qhov zoo, tab sis rau kub - puv fwj, nws yog ib qho tsim nyog los xyuas kom meej tias nws tau tso tawm tag nrho saum cov iav hloov pauv kub.
Nquag Nug cov lus nug thiab kev daws teeb meem
1. Tuav rau saum thiab nyias hauv qab: ncua lub sijhawm ua ntej- tshuab, lossis txo qhov ua ntej- tshuab siab thiab txo cov cua ntws.
2. Thicker nyob rau hauv qab thiab nyias nyob rau saum toj: Contrary to top.
3. Muaj wrinkles nyob rau hauv lub raj mis caj dab: lub pre- tshuab yog lig dhau lawm los yog lub pre- tshuab siab tsawg dhau lawm, los yog lub qhov khoob tsis txias zoo ntawm no.
4. Hauv qab yog dawb: lub preform yog txias heev; nws stretched dhau lawm; lub pre- tshuab yog ntxov dhau los yog ua ntej- tshuab siab dhau lawm.
5. Muaj qhov tshwm sim iav tsom rau hauv qab ntawm lub raj mis ppt: cov khoom siv ntau dhau ntawm lub raj mis hauv qab; ua ntej- tshuab yog lig dhau lawm, thiab qhov ua ntej - tshuab siab qis dhau lawm.
6. Muaj wrinkles nyob rau hauv qab ntawm lub raj mis: lub hauv qab kub yog siab dhau lawm (qhov txias ntawm lub qhov rooj tsis zoo); lub pre- tshuab siab tsawg dhau lawm thiab tus nqi ntws tsawg dhau.
7. Lub raj mis tag nrho yog huab (opaque): Tsis txaus cua txias.
8. Cov xim dawb ib nrab: Kev ncab ntau dhau, qhov kub ntawm no qis dhau, lossis ua ntej- tshuab yog ntxov dhau, lossis tus pas nrig yog kov.
9. Lub eccentricity ntawm lub hauv qab ntawm lub raj mis yas: nws yuav muaj feem xyuam rau qhov kub ntawm lub preform, stretching, ua ntej - tshuab, siab - siab tshuab, thiab lwm yam. Txo qhov kub ntawm lub preform. ; ua kom lub stretching ceev; xyuas qhov sib txawv ntawm lub taub hau khi pas nrig thiab hauv qab pwm; ncua lub pre- tshuab kom txo tau lub pre- tshuab siab; ncua lub siab -siab tshuab; xyuas seb lub preform yog eccentric.
