Joint Construction betwen Cooling on Cavity and Mold Base with O-Ring

What is O ring
o-ring is a loop of elastomer with a round (o-shaped) cross-section used as a mechanical seal or gasket. They are designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface. (wikipedia.com)
O-Rings are torus-shaped (i.e. doughnut-shaped) objects made from elastomeric compounds such as natural or synthetic rubber, and are used to seal mechanical parts against fluid movement (air or liquid). O-Rings perform their sealing action by deforming to take the shape of their cavity, after being oversized to guarantee an predetermined interference fit.( efunda.com)

Blow Mold Material Selection

Specifications

MATERIALS	OUTSTANDING PROPERTIES	COST IN 3	TYPICAL APPLICATION	HARDNESS D2241	HEAT DIST D648	VICAT D1525	BRITTLENESS TEMP D746	FLEX MODULUS	TENSILE D412
OLEFINS
LDPE	Low Cost	0.017	Bellows	42 D		180	-75	24,000	2,600
HDPE	Low Cost	0.020	Bottles	68 D	165-F	255-F	<-105 F	135,000	3,900
PP

Effects of Extrusion Blow Molding Internal Cooling Technology on HDPE Container Performance

from site : idspackaging.com (original site)

Introduction

Blow molding machines are used for the production of plastic parts in many industries including packaging and automotive. Packaging, however, is the single largest user of blow molded thermoplastic containers in the US with approximately 70 percent of market (Rosato et. al., 2004).

The rigid and semi-rigid plastic packaging industry is an economic power that comprises 21 percent of the $115 billion packaging industry (Ernst and Young, 2002). Plastic containers alone totaled $11.4 billion dollars in 2001. Plastic bottle demand grows by more than four percent each year and is expected to reach 11 billion pounds by 2006 as shown in Figure 1.

BLOW MOLD - pengertian secara umum

Proses Blowing terutama dimanfaatkan untuk membuat wadah berdinding tipis. Suatu silinder bahan plastik yang disebut porison diekstrusi secepat mungkin dan dijepit pada ujung cetakan-betah seperti tampak pada gambar. Pada waktu cetakan ditutup porison ditutup porison dipotong dan akibat tekanan udara, bahan tertekan ke permukaan cetakan. cetakan harus mempunyai saluran udara yang memadai agar permukaan produk mulus. Segera setelah produk cukup dingin, cetakan dibuka dan produk diketuarkan.