Dual Preform Storage Units for Batch Quality Consistency
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Solution Overview
Problem
The mixing of preforms from different production batches in a single storage silo leads to varying heating profiles and inconsistent quality in the stretch blow molding process, resulting in fluctuating bottle quality or even bursting during the blow molding process.
Innovation Solution
A device with two separate preform storage units, where only preforms from one batch are fed to the blow molding machine at a time, preventing batch mixing, and using sensors to monitor radiation absorption behavior to adjust heating or block supply if deviations are significant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If preforms from different production batches are mixed in a single storage silo, then the storage capacity is efficiently utilized, but the heating profiles vary and quality consistency deteriorates
Solution Approach 1:
The single preform storage silo is divided into multiple separate storage silos, each dedicated to storing preforms from a single production batch. This segmentation prevents mixing of different batches while maintaining efficient storage capacity utilization through parallel storage units.
2Device complexity
If preforms from different batches are mixed in storage, then the storage system remains simple, but heating results fluctuate and bottle quality varies
Solution Approach 1:
The storage system is segmented into multiple independent silos, each handling a single batch. This maintains operational simplicity while dramatically improving heating result consistency by eliminating batch mixing.
Solution Approach 2:
Each storage silo is assigned a specific function of storing a particular production batch, creating local quality control zones. This ensures that preforms with identical characteristics are processed together, maintaining reliability.
3Device complexity
If a single preform storage unit is used, then the device structure remains simple, but preforms from different batches mix causing burst defects
Solution Approach 1:
The single storage unit is segmented into multiple separate silos, preventing harmful mixing of batches that causes burst defects during blow molding.
Solution Approach 2:
The problematic mixing function is extracted from the storage system by providing separate dedicated storage silos for each batch, eliminating the source of burst defects.
4Productivity
If continuous refilling of a single storage silo is performed, then production continuity is maintained, but batch mixing occurs causing quality fluctuations
Solution Approach 1:
Multiple storage silos allow continuous production by switching between batches without mixing, maintaining productivity while ensuring quality uniformity within each batch.
Solution Approach 2:
The system maintains continuous production flow by having multiple batches ready in separate silos, allowing seamless transition from one batch to another without interrupting the blow molding process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures consistent preform quality, reduces scrap rates due to incorrect blowing, and maintains continuous production flow by preventing interruptions during refilling, while supporting the FIFO principle and maintaining separate batch qualities.
Implementation Method 1
sensors are provided which, for example, monitor the radiation absorption behavior of the individual preform batches
Implementation Method 2
the plastic preforms are preferably heated to a temperature required for blow molding
Data Source
Figure 1
AI summary
A device (1) for forming plastic preforms (5) into plastic containers (10), comprising a feeding device (2) for supplying the plastic preforms (5) to the device (1), at least one first preform storage unit (12) wherein a plurality of plastic preforms (5) are arranged unsorted in the preform storage unit (12), and an alignment device (8) for bringing the plastic preforms (5) into a predetermined position before feeding them to the device (1). According to the invention, the device (1) has at least one second preform storage unit (14) wherein each preform storage unit (12, 14) can hold a plurality of plastic preforms (5) from exactly one production batch.