瓶胚高速注塑干燥系統(tǒng)之二,PET瓶胚,瓶胚高速注塑,PET干燥系統(tǒng)

預(yù)結(jié)晶模塊是系統(tǒng)的預(yù)處理核心，包含低速攪拌 / 振動(dòng)結(jié)晶器、熱風(fēng)加熱器、布風(fēng)板、料位傳感器，核心功能是將無(wú)定形 PET 切片結(jié)晶度提升至 25%~35%，定型防粘連，同時(shí)預(yù)熱切片至 140~160℃。

The pre-crystallization module is the preprocessing core of the system, including low-speed stirring/vibration crystallizer, hot air heater, air distribution plate and level sensor, and its core function is to increase the crystallinity of amorphous PET chips to 25%~35%, shape and prevent adhesion, and preheat the chips to 140~160℃ at the same time.
除濕干燥模塊是系統(tǒng)的深度脫水核心，包含分子篩除濕機(jī)（雙塔 / 轉(zhuǎn)輪）、高溫加熱器、干燥料斗、露點(diǎn)傳感器，可將環(huán)境空氣露點(diǎn)降至 - 40℃~-70℃，經(jīng)加熱至 160~180℃后形成高溫低露點(diǎn)干燥熱風(fēng)，實(shí)現(xiàn)切片深度脫水。
The dehumidification and drying module is the core of deep dehydration of the system, including molecular sieve dehumidifier (double tower/rotary wheel), high temperature heater, drying hopper and dew point sensor, which can reduce the dew point of ambient air to -40℃~-70℃, and form high temperature and low dew point dry hot air after heating to 160~180℃ to realize deep dehydration of chips.
密閉輸送模塊包含真空上料機(jī)、密閉螺旋輸送機(jī)、保溫料斗、鎖氣旋轉(zhuǎn)閥，實(shí)現(xiàn)切片從預(yù)結(jié)晶模塊到干燥模塊、再到注塑機(jī)料斗的全程密閉輸送，杜絕與環(huán)境濕空氣接觸，防止二次吸濕。
The airtight conveying module includes vacuum feeder, airtight screw conveyor, thermal insulation hopper and air lock rotary valve, which realizes the whole process airtight conveying of chips from the pre-crystallization module to the drying module and then to the injection moulding machine hopper, eliminating contact with ambient humid air and preventing secondary moisture absorption.
熱風(fēng)再生模塊包含循環(huán)風(fēng)機(jī)、再生加熱器、過(guò)濾器、廢風(fēng)排出閥，實(shí)現(xiàn)分子篩的吸附 - 再生循環(huán)，雙塔分子篩一用一備、轉(zhuǎn)輪分子篩連續(xù)旋轉(zhuǎn)，保證干燥熱風(fēng)的低露點(diǎn)持續(xù)穩(wěn)定供應(yīng)，同時(shí)采用余熱回收設(shè)計(jì)，降低能耗。
The hot air regeneration module includes circulation fan, regeneration heater, filter and waste air discharge valve, which realizes the adsorption-regeneration cycle of the molecular sieve. The double-tower molecular sieve is for one use and one standby, and the rotary molecular sieve rotates continuously to ensure the continuous and stable supply of low dew point of dry hot air, and at the same time adopts waste heat recovery design to reduce energy consumption.
智能控制模塊是系統(tǒng)的 “大腦”，包含工業(yè)級(jí) PLC、7/10 寸觸摸屏、溫度 / 壓力 / 料位 / 露點(diǎn)傳感器、變頻調(diào)速器，支持工藝參數(shù)配方化管理，可與注塑機(jī)聯(lián)動(dòng)，根據(jù)注塑產(chǎn)能自動(dòng)調(diào)節(jié)干燥供料速度。
The intelligent control module is the "brain" of the system, including industrial PLC, 7/10 inch touch screen, temperature/pressure/level/dew point sensors and frequency converter, supporting formula management of process parameters, and can be interconnected with the injection moulding machine to automatically adjust the drying and feeding speed according to the injection capacity.
保溫輔件模塊包含聚氨酯保溫層、氣流擴(kuò)散錐、粉塵過(guò)濾器、消音器，減少系統(tǒng)熱損耗（熱損失率＜5%），保證熱風(fēng)均勻穿透料層，同時(shí)過(guò)濾粉塵、降低設(shè)備運(yùn)行噪音，符合車間環(huán)保要求。
The thermal insulation accessory module includes polyurethane insulation layer, air flow diffusion cone, dust filter and muffler, which reduces the heat loss of the system (heat loss rate ＜5%), ensures that the hot air penetrates the material layer evenly, and at the same time filters dust and reduces the equipment operation noise, meeting the workshop environmental protection requirements.
四、系統(tǒng)核心工作原理
瓶胚高速注塑干燥系統(tǒng)的核心工作原理是基于 PET 熱結(jié)晶動(dòng)力學(xué)與傳質(zhì)脫水原理，通過(guò) “分級(jí)預(yù)結(jié)晶定型 + 高溫低露點(diǎn)穿流干燥 + 閉環(huán)熱風(fēng)再生 + 全程密閉輸送” 的連續(xù)工藝流，實(shí)現(xiàn) PET 切片的深度干燥，且全程與注塑機(jī)聯(lián)動(dòng)，匹配高速注塑節(jié)拍。
The core working principle of the drying system for high-speed preform injection moulding is to realize the deep drying of PET chips through a continuous process flow of "graded pre-crystallization shaping + high temperature and low dew point cross-flow drying + closed-loop hot air regeneration + whole process airtight conveying" based on the PET thermal crystallization kinetics and mass transfer dehydration principle, and the whole process is interconnected with the injection moulding machine to match the high-speed injection cycle.
三機(jī)一體集成式系統(tǒng)為連續(xù)閉環(huán)作業(yè)，無(wú)間斷供料，單批次切片干燥總時(shí)長(zhǎng) 4~6 小時(shí)，完全適配 0.5~8t/h 的瓶胚注塑產(chǎn)能，其完整工作流程分 6 個(gè)核心環(huán)節(jié)，各環(huán)節(jié)無(wú)縫銜接、參數(shù)精準(zhǔn)可控。
The three-in-one integrated system is a continuous closed-loop operation with uninterrupted feeding, and the total drying time of a single batch of chips is 4~6 hours, which is fully adapted to the preform injection capacity of 0.5~8t/h. Its complete working process is divided into 6 core links, which are seamlessly connected and the parameters are precisely controllable.
1. 原料密閉上料與預(yù)處理
常溫?zé)o定形 PET 切片經(jīng)真空上料機(jī)從原料倉(cāng)輸送至預(yù)結(jié)晶模塊的進(jìn)料口，通過(guò)鎖氣旋轉(zhuǎn)閥密閉進(jìn)入結(jié)晶器，料位傳感器實(shí)時(shí)控制料層厚度 20~50cm，防止料層過(guò)厚導(dǎo)致受熱不均、過(guò)薄造成熱風(fēng)短路。
Normal temperature amorphous PET chips are conveyed from the raw material silo to the feed inlet of the pre-crystallization module by a vacuum feeder, and enter the crystallizer hermetically through an air lock rotary valve. The level sensor controls the material layer thickness at 20~50cm in real time to prevent uneven heating due to too thick material layer and hot air short circuit due to too thin material layer.